Pressure connection device

Abstract

The pressure connecting device comprises a pressure guiding block, a pressure bearing block, a base and a fixing assembly, the first end of the pressure guiding block is used for being connected with a pressure instrument, the second end of the pressure guiding block forms a first piston structure, and a first through hole is formed in the pressure guiding block; a first piston cavity is formed in the first end of the pressure-bearing block, the first piston structure is movably connected with the inner side of the first piston cavity so that a first pressure containing cavity with the variable volume can be formed in the first piston cavity, a second piston structure is formed at the second end of the pressure-bearing block, a second through hole is formed in the pressure-bearing block, and a second piston cavity is formed in the first end of the base. The second piston structure is movably connected with the inner side of the second piston cavity so that a second pressure containing cavity with the variable volume can be formed in the second piston cavity, a medium input port is formed in the second end of the base, a third through hole is formed in the base, and when the medium pressure of the second pressure containing cavity is larger than or equal to a preset value, the pressure bearing block moves towards the opening and closing space along the second piston cavity. The pressure bearing block abuts against the pressure guiding block.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure calibration equipment, and particularly relates to a pressure connecting device. BACKGROUND

[0002] In the pressure calibration process, the pressure instrument can be detachably connected with the pressure calibration device through the pressure connecting device.

[0003] The first pressure connecting device in the related art can include a locking sleeve and a plurality of threaded inserts which are radially slidably arranged on a frame, the locking sleeve is arranged on the frame and can drive the threaded inserts to slide radially during sliding along the frame, and a connecting rod is arranged in the frame and the connecting end of the connecting rod is located between the plurality of threaded inserts. In use, the locking sleeve can be pressed down, the threaded inserts slide outward and expand, and the pressure instrument can be inserted between the plurality of threaded inserts; the locking sleeve is released, the locking sleeve can be reset under the action of the spring between the locking sleeve and the frame, and the threaded inserts are pushed inward during the resetting process to tightly hold the threaded connecting end of the pressure instrument, and then the locking sleeve is rotated to drive the threaded inserts to rotate together, so that the pressure instrument is sealingly connected with the connecting end of the connecting rod.

[0004] The second pressure connecting device in the related art can include a connector body and a claw, a piston cavity is formed in the connector body, a piston column is slidably arranged in the piston cavity, a first spring is arranged between the lower part of the piston column and the inner wall of the piston cavity, a locking block is arranged on the outer side of the upper end of the connector body and can slide radially relative to the connector body, a sleeve is arranged on the outer side of the locking block, and a second spring is arranged between the lower part of the sleeve and the outer side wall of the connector body. In use, the sleeve can be pressed down, the locking block can be expanded outward, the pressure instrument can be inserted between the plurality of locking blocks, and the piston column is pressed down, so that the pressure instrument is connected with the piston column, and then the sleeve is released, the sleeve can be automatically reset under the action of the second spring, so that the locking block moves inward to lock the pressure instrument. The piston column can be sealingly connected with the pressure instrument under the action of the elastic force of the first spring and the pressure of the medium flowing into the piston cavity, and the degree of sealing increases with the increase of the medium pressure.

[0005] The third pressure connecting device in the related art can include a connector body and a pressure instrument connector plug which is threadedly connected with one end of the connector body, a pressing ring is coaxially arranged on one end of the connector body, a first spring which deforms along the axis of the connector body is arranged between the pressing ring and the connector body, a clamping block is rotatably connected in the connector body, a second spring is arranged between one side of the clamping block and the connector body, the other side of the clamping block is clamped with one end of a clamping sleeve, the clamping sleeve is slidably arranged on the outer side wall of the connector plug, and a third spring is arranged between the other end of the clamping sleeve and the connector plug. The sealing connection between the connector plug and the connector body is realized by arranging a sealing ring between one end of the connector plug and the connector body.

[0006] A fourth pressure connection device in the related art comprises an outer sleeve, a locking block, a floating inner tube, a tensioning sleeve and a base. The floating inner tube is arranged in the tensioning sleeve and is in sliding cooperation with the tensioning sleeve. The upper portion of the tensioning sleeve is provided with the locking block. The outer sleeve is sleeved on the locking block and is fixedly connected with the base. The base is provided with a clamping and loosening driving gas path. An inner cavity is arranged between the base and the tensioning sleeve. The inner cavity is in communication with the clamping and loosening driving gas path. When it is necessary to assemble a pressure instrument, gas is introduced into the clamping and loosening driving gas path. The gas enters the lower cavity of the inner cavity to lift the tensioning sleeve, thereby lifting the locking block. The locking block is opened outward under the cooperation of the inner wall bevel structure of the outer sleeve in the lifting process. The pressure instrument is placed in the locking block and is connected with the floating inner tube. Then the gas introduction into the clamping and loosening driving gas path is stopped. The locking block is reset under the action of the spring arranged in the upper cavity of the inner cavity, so that the locking block clamps the pressure instrument. In the calibration process, part of the calibration medium enters the pressure instrument from the channel of the floating inner tube, and another part of the calibration medium enters the upper cavity of the inner cavity through the side wall through hole of the floating inner tube, thereby pushing the tensioning sleeve to move downward, and then driving the locking block to move downward, and making the locking block tighten under the action of the outer sleeve, thereby realizing clamping of the pressure gauge, and the clamping force increases with the increase of the pressure of the calibration medium.

[0007] However, in the above pressure connection device, the sealing effect between the pressure instrument and the pressure connection device is poor, which affects the medium pressure in the pressure calibration process, thereby reducing the accuracy of the pressure calibration result. Utility model content

[0008] The embodiment of the present application provides a pressure connection device, which improves the connection and sealing effect between the pressure instrument and the pressure connection device, thereby improving the accuracy of the pressure calibration result.

[0009] The pressure connection device provided by the embodiment of the present application is used for calibrating a pressure instrument. The pressure connection device comprises:

[0010] A pressure guide block, a first end of the pressure guide block is used for connecting the pressure instrument, a second end of the pressure guide block forms a first piston structure, a first through hole is arranged in the pressure guide block, the first end of the pressure guide block is in communication with the first piston structure through the first through hole, and the first end of the pressure guide block is opposite to the second end of the pressure guide block in direction;

[0011] A pressure bearing block, a first end of the pressure bearing block is inwardly recessed to form a first piston cavity, the first piston structure is movably connected with the inner side of the first piston cavity to form a first pressure cavity with variable volume in the first piston cavity, a second end of the pressure bearing block forms a second piston structure, a second through hole is arranged in the pressure bearing block, the first piston cavity is in communication with the second piston structure through the second through hole, and the first end of the pressure bearing block is opposite to the second end of the pressure bearing block in direction;

[0012] The base is internally recessed at a first end to form a second piston cavity, and a second piston structure is movably connected to the inside of the second piston cavity to form a second pressure chamber with a variable volume in the second piston cavity. A medium input port is provided at a second end of the base, and a third through hole is provided in the base. The medium input port is in communication with the second piston cavity through the third through hole.

[0013] A fixed assembly is movably sleeved on the pressure guide block. One end of the fixed assembly is connected to the base, and the other end of the fixed assembly forms an opening and closing space extending from the first end of the pressure guide block. The fixed assembly can be switched between an unlocked state and a locked state. When the fixed assembly is in the unlocked state, the fixed assembly can allow the pressure instrument to enter the opening and closing space, so that the pressure instrument is connected to the pressure guide block. When the fixed assembly is in the locked state, the fixed assembly is clamped on the pressure instrument.

[0014] The pressure medium enters the second pressure chamber through the medium input port. When the medium pressure of the second pressure chamber is greater than or equal to a preset value, the pressure block moves along the second piston cavity to the opening and closing space, and the pressure block abuts against the pressure guide block.

[0015] The embodiment of the present application provides a pressure connection device, which comprises a pressure block, a pressure receiving block, a first piston cavity, a first piston structure, a first pressure cavity, a second piston cavity, a second piston structure, a second pressure cavity, a medium input port and a medium output port. The pressure block is provided with the first piston cavity and the first piston structure. The pressure receiving block is provided with the second piston cavity and the second piston structure. The first piston structure is movably arranged in the first piston cavity. The first pressure cavity is formed in the first piston cavity. The second piston structure is movably arranged in the second piston cavity. The second pressure cavity is formed in the second piston cavity. The first pressure cavity and the second pressure cavity are communicated through a second through hole formed in the pressure receiving block. The medium input port is arranged at one end of the pressure receiving block and communicated with the second pressure cavity through a third through hole formed in the pressure receiving block. The medium output port is arranged at one end of the pressure block away from the pressure receiving block and communicated with the first pressure cavity through a first through hole formed in the pressure block. When the pressure instrument is calibrated, the pressure instrument is assembled at the medium output port of the pressure block, and the pressure medium enters the first pressure cavity and the second pressure cavity through the medium input port. When the medium pressure of the second pressure cavity is greater than or equal to a preset value, the pressure receiving block moves along the second piston cavity to the medium output port, and the pressure receiving block abuts against the pressure block, so that the pressure block is subjected to a force towards the pressure instrument. The pressure medium applies a force to the pressure block through the first piston structure and the second piston structure. The force area of the pressure medium on the pressure block is increased, so that the force of the pressure medium on the pressure block is further increased. Compared with the pressure connection device in the related art, the sealing effect between the pressure block and the pressure instrument is improved. As the medium pressure increases, the force of the pressure receiving block on the pressure block towards the pressure instrument also increases, so that the connection sealing property between the medium output port of the pressure connection device and the pressure instrument under high pressure calibration condition is improved, and the accuracy of the calibration result of the pressure instrument is improved.

[0016] In addition, when the medium pressure of the second pressure cavity is less than the preset value, the pressure medium can enter the first pressure cavity through the third through hole and the second through hole, so that the first piston structure of the pressure block is directly subjected to a force of the medium pressure towards the pressure instrument, and the force also increases as the medium pressure increases, so as to ensure the connection sealing property between the pressure block and the pressure instrument under low pressure calibration condition, thereby ensuring the accuracy of the calibration result of the pressure instrument.

[0017] In some implementations, the first through hole is coaxial with the first piston structure, the first bearing surface of the first piston structure is subjected to more uniform and symmetrical medium pressure in the first pressure cavity, so that the first piston structure can move along the axis of the first piston structure when subjected to the medium pressure in the first pressure cavity, and the deflection of the first piston structure is alleviated or avoided. The second through hole is coaxial with the second piston structure, the third bearing surface of the second piston structure is subjected to more uniform and symmetrical medium pressure in the second pressure cavity, the second bearing surface of the pressure block is subjected to more uniform and symmetrical medium pressure in the first pressure cavity, so that the second piston structure can move along the axis of the second piston structure when subjected to the medium pressure in the second pressure cavity, and the deflection of the second piston structure is alleviated or avoided. The first through hole is coaxial with the second through hole, the third through hole is coaxial with the second piston cavity, and during the movement of the second piston structure of the pressure block along the second piston cavity to the opening and closing space, after the second bearing surface of the pressure block abuts against the first bearing surface of the pressure guide block, the pressure block can more effectively transmit the received medium pressure to the pressure guide block, so that the pressure guide block moves along the axis of the pressure block, and the controllability of the force of the pressure block on the pressure guide block is improved.

[0018] In some implementations, the pressure connection device further comprises a first elastic member;

[0019] One end of the first elastic member is connected to the pressure guide block, and the other end of the first elastic member is connected to the pressure block. When the pressure instrument is connected to the pressure guide block, the first elastic member is in a compressed state to exert a spring force on the pressure guide block towards the opening and closing space. When the pressure block moves along the second piston cavity to the opening and closing space, the elastic potential energy of the first elastic member increases.

[0020] One end of the first elastic member is connected to the pressure guide block, and the other end of the first elastic member is connected to the pressure block. When the pressure instrument is connected to the pressure guide block, the first elastic member is in a compressed state to exert a spring force on the pressure guide block towards the opening and closing space.

[0021] When the pressure instrument is connected to the pressure guide block, the first elastic member is in a compressed state to exert a spring force on the pressure guide block towards the opening and closing space. When the pressure block moves along the second piston cavity to the opening and closing space, the elastic potential energy of the first elastic member increases, so that the spring force of the first elastic member on the pressure guide block towards the opening and closing space also increases, thereby increasing the sealing effect between the pressure guide block and the pressure instrument

[0022] In some implementations, the fixing assembly comprises:

[0023] The locking block has an inner side surrounding the opening and closing space;

[0024] The shell is movably sleeved on the outer side of the locking block;

[0025] When the shell is located at the first axial position of the locking block, the inner diameter of the locking block is greater than the outer diameter of the pressure instrument, so that the pressure instrument enters the opening and closing space; when the shell is located at the second axial position of the locking block, the inner diameter of the locking block is less than or equal to the outer diameter of the pressure instrument, so that the locking block clamps the pressure instrument.

[0026] The shell is moved in the axial direction to drive the locking block to expand outward to assemble the pressure instrument or to drive the locking block to move inward to clamp the pressure instrument, thereby improving the connection strength between the pressure instrument and the pressure guide block.

[0027] In some implementations, the pressure connection device further comprises a locking structure movably arranged between the pressure bearing block and the shell, and when the pressure bearing block moves towards the opening and closing space along the second piston cavity, the pressure bearing block pushes the locking structure to move;

[0028] When the pressure bearing block abuts against the pressure guide block, the locking structure is connected with the shell to lock the shell in the locked state; and the locking structure is separated from the shell during the movement of the pressure bearing block in the direction away from the opening and closing space.

[0029] The embodiment of the present application utilizes the driving of the pressure bearing block by the medium pressure, and when the locking structure is connected with the shell, the locking structure limits the movement of the shell, thereby locking the shell in the locked state, increasing the difficulty of the downward movement of the shell during the high-pressure calibration process, improving the clamping stability of the locking block to the pressure instrument during the high-pressure calibration process, reducing the activity of the shell during the high-pressure calibration process due to the indication error of the pressure instrument or the mistaken touch of the operator, and improving the structural stability and safety of the pressure connection device during the high-pressure calibration process.

[0030] In some examples, the locking structure comprises:

[0031] A first locking member movably arranged between the pressure bearing block and the shell, and when the pressure bearing block moves towards the opening and closing space along the second piston cavity, the pressure bearing block pushes the first locking member to move towards the opening and closing space;

[0032] A second locking member connected with the first locking member, and when the pressure bearing block abuts against the pressure guide block, the first locking member pushes the second locking member to be connected with the shell to lock the shell in the locked state;

[0033] The first elastic member of the pressure connection device is connected with the first locking member, the other end of the first locking member is connected with the pressure bearing block, and when the pressure bearing block moves in the direction away from the opening and closing space, the first elastic member pushes the first locking member to move in the direction away from the opening and closing space.

[0034] By setting the locking structure to include the first locking piece and the second locking piece, thus, the first locking piece can extend in the vertical direction and the second locking piece can extend in the horizontal direction when being set, thereby simplifying the structural setting of the locking structure and the assembly process in the shell and the base, saving the interference of the locking structure to other components; further, the locking structure can be matched with the first elastic piece, when the medium pressure decreases, the elastic force of the first elastic piece can push the first locking piece to move away from the combined space, so that the second locking piece can be separated from the first locking piece.

[0035] In some examples, the locking structure further includes a second elastic piece, one end of the second elastic piece is connected with the second locking piece, and the other end of the second elastic piece is connected with the shell, when the pressure block moves away from the combined space, the second elastic piece pushes the second locking piece to separate from the shell.

[0036] The setting of the second elastic piece can make the second locking piece quickly pop out to the outside of the limiting groove without being pushed in the direction of the limiting groove, reducing or avoiding the situation that the second locking piece still stays in the limiting groove during the movement of the pressure block away from the combined space; further, the second elastic piece is matched with the first elastic piece, when the pressure block moves away from the combined space, the second elastic piece can push the second locking piece to separate from the limiting groove, thereby realizing the automatic unlocking of the locking structure.

[0037] In some examples, the shell is provided with a limiting groove, and the direction of the slot of the limiting groove is perpendicular to the movement direction of the shell.

[0038] The first locking piece is provided with a guide slope, when the pressure block moves to the combined space along the second piston cavity, the connection position of the first locking piece and the second locking piece moves along the guide slope to push the second locking piece to move to the limiting groove, when the second locking piece is inserted into the limiting groove, the shell is locked in the locked state.

[0039] The first locking piece and the second locking piece are abutted and matched through the guide slope, so as to simplify the connection structure between the first locking piece and the second locking piece and improve the assembly efficiency of the locking structure on the basis of realizing that the first locking piece can drive the second locking piece to move in the horizontal direction when moving in the vertical direction.

[0040] In some examples, the first locking piece is provided with an abutting surface and an avoiding surface, the avoiding surface has a structure of being recessed inward, and the abutting surface is used for abutting the second locking piece, the abutting surface is connected with the avoiding surface through the guide slope, the axial position of the abutting surface is between the avoiding surface and the pressure block, and the radial position of the abutting surface is between the avoiding surface and the limiting groove.

[0041] The one end of the second locking member is matched with the avoiding surface before the first locking member is subjected to the force of the pressure bearing block towards the opening and closing space; and the one end of the second locking member is moved from the avoiding surface to the abutting surface to be abutted by the abutting surface when the first locking member is subjected to the force of the pressure bearing block towards the opening and closing space.

[0042] The avoiding surface is arranged to preliminarily position the first locking member and the second locking member in the initial state, so that the second locking member can smoothly contact the guide inclined surface when the first locking member moves upward. The abutting surface is arranged to improve the abutting stability of the second locking member.

[0043] In some implementations, the first locking member is arranged in the base before being subjected to the force of the pressure bearing block towards the opening and closing space, and is arranged separately from the pressure bearing block; or the first locking member is fixedly connected with the pressure bearing block to flexibly arrange the first locking member.

[0044] The first locking member can be arranged separately from the pressure bearing block. When the pressure medium enters the second pressure cavity, the pressure bearing block moves towards the opening and closing space along the second piston cavity until the pressure bearing block is in contact with the first locking member. The pressure medium continues to increase, and the pressure bearing block continues to move towards the opening and closing space along the second piston cavity.

[0045] In some implementations, the limiting groove is arranged around the inner wall of the shell. By arranging the limiting groove as an annular groove, the slot opening of the annular groove can always face one second locking member or multiple second locking members when the pressure connecting device is assembled or when the shell rotates around the pressure guide block.

[0046] In some implementations, the shell further comprises an assembly support, which is limitingly connected or fixedly connected with the base. The assembly support is provided with a locking through hole, the position of the locking through hole corresponds to the slot opening of the limiting groove, and the extension direction of the locking through hole is perpendicular to the movement direction of the shell.

[0047] The second locking member is movably arranged in the locking through hole.

[0048] The assembly support is used to assemble the second locking member, which can simplify the structure of the base and the assembly process between the locking structure and the base, and facilitate the disassembly and assembly of the locking structure.

[0049] In some implementations, the pressure connecting device further comprises:

[0050] The third elastic member is arranged between the shell and the base. When the shell moves towards the base, the third elastic member is in a compressed state, and the elastic potential energy of the third elastic member increases, so that the shell can recover from the first axial position to the second axial position under the elastic force of the third elastic member.

[0051] The inner side wall of the shell is provided with a first matching part protruding inwardly, and the side of the locking block away from the pressure guide block is provided with a first matching surface and a second matching surface matched with the first matching part. The second matching surface is located between the first matching surface and the base in the axial direction, and the second matching surface is inclined towards the direction close to the pressure guide block.

[0052] When the shell is located at the second axial position of the locking block, the first matching part abuts against the first matching surface to enable the locking block to clamp the pressure instrument. When the shell is switched from the locked state to the unlocked state, the first matching part slides along the second matching surface.

[0053] By abutting the matching part on the shell against the matching surface on the outer side wall of the locking block, the connection structure between the shell and the locking block is simplified, and the assembly efficiency of the fixing assembly is improved, on the basis of ensuring that the locking block moves outwardly or inwardly during the up-down movement of the shell.

[0054] In some implementations, the inner side wall of the shell is provided with a second matching part protruding inwardly, and the second matching part is arranged in the axial direction of the shell and spaced apart from the first matching part. Correspondingly, the side of the locking block away from the pressure guide block is provided with a third matching surface and a fourth matching surface matched with the second matching part. The fourth matching surface is located between the third matching surface and the base in the axial direction. The first matching surface and the third matching surface are arranged in parallel, and the second matching surface and the fourth matching surface are arranged in parallel.

[0055] When the shell is located at the second axial position of the locking block, the second matching part abuts against the third matching surface to enable the locking block to clamp the pressure instrument. When the shell is switched from the locked state to the unlocked state, the second matching part slides along the fourth matching surface.

[0056] By arranging the first matching surface and the third matching surface in parallel and arranging the second matching surface and the fourth matching surface in parallel, it is ensured that the locking block can move in the horizontal direction during the up-down movement of the shell, so that when the locking block moves towards the pressure instrument, the first limiting structure on the locking block can be aligned with the second limiting structure on the pressure instrument, and the limiting effect of the locking block on the pressure instrument in the axial direction is improved.

[0057] In some implementations, the pressure connection device further comprises a limiting block fixedly connected or limitingly connected with the pressure guide block, so that the limiting block can move relative to the locking block to switch between the first limiting position and the second limiting position.

[0058] When the limiting block is located at the first limiting position, the force exerted by the limiting block on the locking block is smaller than the opposite force exerted by the shell on the locking block, so that the opening-closing space is reduced, or the locking block has an inward clamping force.

[0059] When the limiting block is located at the second limiting position, the force exerted by the limiting block on the locking block is greater than or equal to the reverse force exerted by the shell on the locking block, so that the opening and closing space remains unchanged.

[0060] The limiting block is fixedly connected or limitingly connected with the pressure guide block and cooperates with the first elastic member or the second elastic member. When the shell is pulled downward to the first axial position, the first elastic member pushes the pressure guide block to move, and then drives the limiting block to move to the second limiting position. At this time, the limiting block supports the locking block outwardly to limit the locking block in the unlocked state without the need to continue to exert the downward pulling force on the shell, so that the locking block can be ensured to be in the unlocked state, thereby facilitating the placing of the pressure instrument into the opening and closing space or the taking of the pressure instrument out of the opening and closing space. After that, if the pressure instrument is installed on the pressure connection device, the pressure instrument is connected with the pressure guide block, and then the pressure guide block is pushed downward to move, the limiting block is switched from the second limiting position to the first limiting position, and the locking block can be switched to the locked state, so that the pressure instrument is clamped.

[0061] In some implementations, the side of the locking block facing the pressure guide block has a first limiting surface and a second limiting surface, and the axial position of the second limiting surface is between the first limiting surface and the base, and the radial position of the first limiting surface is between the axis of the pressure guide block and the second limiting surface.

[0062] The relative movement direction of the first limiting surface and the locking block is perpendicular, the limiting block is connected with the first limiting surface when the limiting block is located at the second limiting position, the limiting block is connected with the second limiting surface when the limiting block is located at the first limiting position, and the limiting block moves from the second limiting surface to the first limiting surface when the fixed assembly is switched from the locked state to the unlocked state.

[0063] The first limiting surface and the second limiting surface are provided, which can realize the axial limiting and radial limiting of the limiting block at the second limiting position and the first limiting position, and at least ensure that the locking block has a support force away from the axis of the pressure guide block at the second limiting position, so as to stably keep the locking block in the unlocked state when the fixed assembly is in the unlocked position, and on the other hand, also simplify the cooperation limiting structure between the locking block and the limiting block, and improve the manufacturing and assembly efficiency of the pressure connection device.

[0064] In some implementations, at least part of the second limiting surface away from the first limiting surface is an arc-shaped surface curved toward the axis of the pressure guide block, and the limiting block moves along the arc-shaped surface when switching between the first limiting position and the second limiting position.

[0065] The arc-shaped surface guides the limiting block to smoothly switch between the first limiting position and the second limiting position. In addition, the provision of the arc-shaped surface also enables the limiting block to abut against one end of the arc-shaped surface facing the base when the limiting block is in the first limiting position, thereby improving the stability of the limiting block in the first limiting position.

[0066] In some implementations, the pressure connection device further comprises a fourth elastic member arranged between the limiting block and the base, the fourth elastic member is in a compressed state, and the elastic potential energy of the fourth elastic member increases when the limiting block moves towards the base;

[0067] After the pressure instrument is separated from the opening and closing space, the driving shell moves to the first axial position, the fourth elastic member drives the limiting block to move to the second limiting position, and the opening and closing space remains unchanged.

[0068] The arrangement of the fourth elastic member can smoothly switch the limiting block from the first limiting position to the second limiting position when the shell is pulled down to the first axial position, and the limiting block abuts against the first limiting surface. Further, the limiting block is in limiting connection with the pressure guide block, and cooperates with the fourth elastic member to more flexibly adjust the position of the limiting block.

[0069] In some examples, the limiting block is in limiting connection with the pressure guide block;

[0070] The side wall of the pressure guide block is provided with a first support platform facing the base, and when the limiting block is connected with the first support platform, if the limiting block moves away from the base, the limiting block drives the pressure guide block to move away from the base, and if the pressure guide block moves towards the base, the pressure guide block drives the limiting block to move towards the base.

[0071] The side wall of the pressure guide block is provided with a second support platform facing away from the base, and when the limiting block is connected with the second support platform, if the limiting block moves towards the base, the limiting block drives the pressure guide block to move towards the base, and if the pressure guide block moves away from the base, the pressure guide block drives the limiting block to move away from the base.

[0072] So that when the pressure instrument is assembled, the pressure instrument contacts the first end of the pressure guide block, and during the process of pressing the pressure guide block, the first support platform contacts the limiting block, the limiting block switches from the second limiting position to the first limiting position, and further, if the length of the pressure instrument in the opening and closing space is small, the locking block can continue to push the limiting block to move downwards, so that the position of the limiting block is between the first support platform and the second support platform, thereby the locking block can clamp the pressure instrument, and if the length of the pressure instrument in the opening and closing space is large, the pressure instrument can continue to push the limiting block to move downwards, thereby the locking block can clamp the pressure instrument, which can ensure the sealing degree between different types of pressure instruments and the pressure connection device.

[0073] In some implementations, at least part of the limiting block extends between the first support platform and the second support platform, so that during the upward movement of the limiting block, the limiting block can push the pressure guide block to move upwards by abutting against the first support surface, and during the downward movement of the limiting block, the limiting block can drive the pressure guide block to move downwards by abutting against the second support surface.

[0074] In some implementations, the fixed assembly further comprises an assembly support, the locking block is mounted on the assembly support, the assembly support is at least partially arranged inside the shell, one end of the shell used for cooperating with the base is inwardly bent to form a limiting protrusion, an inner periphery of the limiting protrusion is larger than an outer periphery of the assembly support, a limiting snap spring is arranged between the limiting protrusion and the assembly support, and an inner periphery of the limiting snap spring is smaller than the outer periphery of the assembly support.

[0075] In the assembly process of the pressure connection device, on the basis that the main body of the shell is integrally manufactured, the limiting snap spring can be removed first, because the inner periphery of the limiting protrusion of the shell is larger than the outer periphery of the assembly support, the pressure guide block, the assembly support, the first elastic member, the third elastic member and other structures can be conveniently assembled into the shell from the opening of the end of the shell used for cooperating with the base, and after assembly, the limiting of the pressure guide block, the assembly support and other structures can be realized by installing the limiting snap spring.

[0076] In addition, the limiting snap spring can be removed from the shell when needed, thereby facilitating the disassembly and maintenance of the structure.

[0077] In some implementations, the first end of the pressure guide block is provided with a sealing member, the sealing member surrounds the first through hole, and an enclosed surface of the sealing member is smaller than a radial section of the second piston structure; in this way, it can be ensured that the upward force borne by the second piston structure is greater than the downward force borne by the sealing member, so that when the pressure bearing block abuts against the pressure guide block, the force of the sealing member on the pressure bearing block through the pressure guide block is smaller than the upward force of the pressure bearing block, thereby ensuring that the pressure bearing block abuts against the pressure guide block and the first sealing member to press the pressure instrument, so that the sealing effect between the pressure instrument and the sealing member is improved.

[0078] The radial section of the first piston structure is smaller than the radial section of the second piston structure, so that the upward force exerted by the pressure medium on the first piston structure is smaller than the upward force exerted by the pressure medium on the second piston structure, thereby enabling the overall structure of the pressure bearing block and the pressure guide block to bear the force towards the opening and closing space when the pressure bearing block abuts against the pressure guide block, so as to abut against the pressure instrument and improve the sealing between the pressure guide block and the pressure instrument. BRIEF DESCRIPTION OF DRAWINGS

[0079] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0080] Figure 1 is an assembly schematic diagram of the pressure connection device and the pressure instrument provided by an embodiment of the present application Figure 1 ;

[0081] Figure 2 is an assembly diagram of a pressure connection device and a pressure instrument provided by an embodiment of the present application Figure 2 ;

[0082] Figure 3 is a whole structure diagram of a pressure connection device provided by an embodiment of the present application

[0083] Figure 4 is a sectional view of one of the pressure connection devices provided by an embodiment of the present application

[0084] Figure 5 is a partial enlarged view of A in Figure 4

[0085] Figure 6 is a sectional view of the pressure connection device in an unlocked state provided by an embodiment of the present application

[0086] Figure 7 is a partial enlarged view of B in Figure 6

[0087] is a partial enlarged view of F in Figure 8 Figure 1 is a partial enlarged view of D in

[0088] Figure 9 Figure 2 is a partial enlarged view of E in

[0089] Figure 10 is a partial enlarged view of E in Figure 4

[0090] is a partial enlarged view of C in Figure 11 Figure 1 is a sectional view of another pressure connection device provided by an embodiment of the present application

[0091] Figure 12 is a partial enlarged view of G in

[0092] Figure 13 Figure 12

[0093] BRIEF DESCRIPTION OF THE DRAWINGS

[0094] 10-pressure connection device; 20-pressure instrument

[0095] 100-pressure block; 110-first piston structure; 111-first sealing member; 112-first pressure receiving surface; 101-first through hole; 102-medium outlet; 120-first support surface; 130-second support surface

[0096] ​​​​​​200 - pressure block; 210 - first piston cavity; 201 - second through hole; 220 - second piston structure; 221 - second sealing element; 222 - second pressure bearing surface; 223 - third pressure bearing surface;

[0097] 300 - base; 301 - third through hole; 302 - medium input port; 310 - second piston cavity;

[0098] 400 - fixing assembly; 401 - opening and closing space; 410 - locking block; 411 - extension; 412 - first limiting surface; 413 - second limiting surface; 413a - first part of the second limiting surface; 413b - second part of the second limiting surface; 414 - first matching surface; 415 - second matching surface; 416 - third matching surface; 417 - fourth matching surface; 418 - fifth matching surface; 420 - shell; 421 - first matching part; 422 - second matching part; 423 - limiting protrusion; 424 - limiting groove; 430 - limiting clasp spring; 140 - third sealing element;

[0099] 500 - first elastic element;

[0100] 600 - locking structure; 610 - first locking element; 611 - guide inclined surface; 612 - abutting surface; 613 - avoiding surface; 620 - second locking element; 621 - stopper; 630 - second elastic element;

[0101] 700 - assembly support; 710 - locking through hole; 711 - first small hole diameter section; 712 - large hole diameter section; 713 - second small hole diameter section; 720 - annular part; 730 - clamping groove; 740 - extension;

[0102] 800 - third elastic element;

[0103] 900 - limiting block; 910 - fourth elastic element. DETAILED DESCRIPTION

[0104] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should be within the protection scope of the present application.

[0105] It should be noted that in the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from the description herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0106] In the description of the present application, it is to be understood that the terms "upper", "lower", "horizontal", "bottom", "inner", "outer" and the like are directions or positional relationships based on the directions or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium.

[0107] In the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. However, it is noted that direct connection means that the connection between the two main bodies does not form a connection relationship through an excessive structure, but is connected only through the connection structure to form a whole. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0108] In the present application, the description involving "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features.

[0109] Figure 1 is an assembly schematic of the pressure connection device and the pressure instrument provided by an embodiment of the present application Figure 1 , Figure 2 is an assembly schematic of the pressure connection device and the pressure instrument provided by an embodiment of the present application Figure 2 , Figure 3 is a schematic diagram of the overall structure of the pressure connection device provided by an embodiment of the present application Figure 4 is a sectional view of one of the pressure connection devices provided by an embodiment of the present application. Refer to Figures 1 to 4As shown, the embodiment of the present application provides a pressure connection device 10 for fixing and transmitting pressure medium to a pressure instrument 20 in the process of verifying the pressure instrument 20. The pressure connection device 10 has a medium channel, a medium input port 302 and a medium output port 102 arranged at both ends of the medium channel. In actual verification, the medium input port 302 of the pressure connection device 10 is in communication with a medium source, or the medium input port 302 is in communication with the medium source through a pressure medium control device, and the pressure instrument 20 is fixed to the medium output port 102 of the pressure connection device 10 and in communication with the medium output port 102. In this way, the pressure connection device 10 can input the pressure medium output by the medium source into the pressure instrument 20 through the medium channel and the medium output port 102, so as to verify the qualification of the pressure instrument 20.

[0110] It can be understood that the sealing between the pressure instrument 20 and the medium output port 102 of the pressure connection device 10 will affect the accuracy of the verification result of the pressure instrument 20; further, the greater the medium pressure, the higher the risk of medium leakage between the medium output port 102 and the pressure instrument 20, and the higher the sealing requirement between the medium output port 102 and the pressure instrument 20.

[0111] In some examples, in order to realize the verification function of different pressure instruments 20, the pressure instrument 20 is detachably connected with the pressure connection device 10. The detachable connection mode puts high requirements on the sealing between the pressure instrument 20 and the pressure connection device 10. On the one hand, the sealing needs to be considered, and on the other hand, the convenience of detachable connection needs to be considered.

[0112] In order to ensure the sealing between the pressure instrument 20 and the medium output port 102 of the pressure connection device 10, one kind of pressure connection device 10 in the related art is connected with the pressure instrument 20 through internal and external thread cooperation, or through the clamping jaw structure arranged in the pressure connection device 10, to realize the locking of the pressure instrument 20, so as to enhance the connection strength between the pressure connection device 10 and the pressure instrument 20; the medium output port 102 of another kind of pressure connection device 10 in the related art is provided with a sealing ring, so as to improve the sealing between the pressure instrument 20 and the medium output port 102. In the above two kinds of related art, the sealing surface is subjected to fixed sealing pressure, and when the medium pressure increases, for example, reaches dozens of MPa, the sealing pressure is difficult to meet the sealing requirement.

[0113] In another pressure connection device 10 in the related art, a pressure guide block 100 and an elastic member are movably arranged in a housing 420, a medium channel, a medium inlet 302 and a medium outlet 102 are arranged on the pressure guide block 100, and the elastic member is arranged between the pressure guide block 100 and the housing 420. When the pressure instrument 20 is assembled in the housing 420 and cooperates with the pressure guide block 100, the elastic potential energy of the elastic member is increased, and thus the elastic member can exert an elastic force on the pressure guide block 100 towards the pressure instrument 20 to improve the sealing performance between the pressure guide block 100 and the pressure instrument 20. In this related art, the sealing pressure provided by the elastic member is small and has an upper limit, and when the medium pressure increases, for example, to tens of MPa, the sealing pressure is difficult to meet the sealing requirement

[0114] In another pressure connection device 10 in the related art, a pressure guide block 100 and an elastic member are movably arranged in a housing 420, a medium channel, a medium inlet 302 and a medium outlet 102 are arranged on the pressure guide block 100, and the elastic member is arranged between the pressure guide block 100 and the housing 420. When the pressure instrument 20 is assembled in the housing 420 and cooperates with the pressure guide block 100, the elastic potential energy of the elastic member is increased, and thus the elastic member can exert an elastic force on the pressure guide block 100 towards the pressure instrument 20 to improve the sealing performance between the pressure guide block 100 and the pressure instrument 20. In this related art, the sealing pressure provided by the elastic member is small and has an upper limit, and when the medium pressure increases, for example, to tens of MPa, the sealing pressure is difficult to meet the sealing requirement

[0115] However, in the related art of the above pressure connection device, the sealing effect between the pressure instrument and the medium outlet of the pressure connection device is poor, which affects the medium pressure in the pressure calibration process and reduces the accuracy of the pressure calibration result.

[0116] The embodiment of the present application provides a pressure connection device 10, which comprises a pressure block 100, a pressure receiving block 200, a first piston structure 110 and a second piston structure 220, and a base 300. The pressure block 100 is provided with a medium outlet 102 and a first through hole 101. The pressure receiving block 200 is arranged at one end of the pressure block 100 away from the medium outlet 102, and is provided with a first piston cavity 210. The first piston structure 110 is arranged at one end of the pressure block 100 away from the pressure receiving block 200, and is arranged in the first piston cavity 210. The base 300 is arranged at one side of the pressure receiving block 200 away from the pressure block 100, and is provided with a second piston cavity 310. The second piston structure 220 is arranged at one side of the pressure receiving block 200 away from the pressure block 100, and is arranged in the second piston cavity 310. The first piston cavity 210 and the second piston cavity 310 are communicated through a second through hole 201 formed in the pressure receiving block 200. The medium inlet 302 is arranged at one end of the base 300, and is communicated with the second piston cavity through a third through hole 301 formed in the base 300. When the pressure instrument 20 is calibrated, the pressure instrument 20 is arranged at the medium outlet 102 of the pressure block 100, and the pressure medium enters the second piston cavity through the medium inlet 302. When the pressure of the medium in the second piston cavity is greater than or equal to a preset value, the pressure receiving block 200 moves along the second piston cavity 310 towards the medium outlet 102, and the pressure receiving block 200 abuts against the pressure block 100, so that the pressure block 100 is subjected to a force towards the pressure instrument 20, and the force is greater than a force directly acting on the pressure block 100 by the medium pressure. Compared with the pressure connection device 10 in the related art, the sealing effect between the pressure block 100 and the pressure instrument 20 is improved. With the increase of the pressure of the medium, the force of the pressure receiving block 200 on the pressure block 100 towards the pressure instrument 20 also increases, so that the connection sealing property between the medium outlet 102 of the pressure connection device 10 and the pressure instrument 20 under high-pressure calibration condition is improved, and the accuracy of the calibration result of the pressure instrument 20 is improved.

[0117] In addition, when the pressure of the medium in the second piston cavity is less than the preset value, the pressure medium can enter the first piston cavity through the third through hole 301 and the second through hole 201, so that the first piston structure 110 of the pressure block 100 is directly subjected to a force of the medium pressure towards the pressure instrument 20, and the force also increases with the increase of the pressure of the medium, so as to ensure the connection sealing property between the pressure block 100 and the pressure instrument 20 under low-pressure calibration condition, and the accuracy of the calibration result of the pressure instrument 20 is ensured.

[0118] The structure of the pressure connection device 10 of the embodiment of the present application is described in detail below with reference to the drawings.

[0119] Reference Figures 1 to 4 As shown, the pressure connection device 10 of this application embodiment includes a pressure-guiding block 100. The first end of the pressure-guiding block 100 is used to connect to the pressure gauge 20, and the second end of the pressure-guiding block 100 forms a first piston structure 110. A first through hole 101 is provided in the pressure-guiding block 100, and the first end of the pressure-guiding block 100 is connected to the first piston structure 110 through the first through hole 101. The first end of the pressure-guiding block 100 and the second end of the pressure-guiding block 100 are in opposite directions.

[0120] Reference Figure 1 As shown, in some examples, the first and second ends of the pressure block 100 can be along the length direction of the pressure block 100 (see reference). Figure 1 At opposite ends (as shown in the z-direction), the first through hole 101 extends along the length of the pressure-applying block 100. The first end of the pressure-applying block 100 has a medium outlet 102, which communicates with the first through hole 101. When the pressure gauge 20 is connected to the first end of the pressure-applying block 100, the first through hole 101 within the pressure-applying block 100 communicates with the pressure gauge 20 through the medium outlet 102 at the first end, thereby delivering the pressure medium within the pressure-applying block 100 to the pressure gauge 20 to verify the accuracy of the pressure measurement result.

[0121] In some examples, the connection between the pressure gauge 20 and the first end of the pressure-sensing block 100 can be an abutment, so that the pressure medium in the pressure-sensing block 100 is transmitted to the pressure gauge 20 through a sealed connection. When the pressure of the medium in the pressure-sensing block 100 is zero, or when there is no pressure medium in the pressure-sensing block 100, the connection between the pressure gauge 20 and the first end of the pressure-sensing block 100 can also be a contact connection without force.

[0122] Reference Figure 4 As shown, in some examples, a first seal 111 may be provided on the side wall of the second end of the pressure block 100, so that the portion of the pressure block 100 on which the first seal 111 is provided forms a first piston structure 110, and a first through hole 101 in the pressure block 100 penetrates the first piston structure 110, so that the pressure medium enters the pressure block 100 from the first piston structure 110 at the second end of the pressure block 100.

[0123] Exemplarily, the first seal 111 can be a sealing ring or a sealing coating arranged on the sidewall of the second end of the pressure guide block 100. In some examples, an annular groove can be formed on the sidewall of the second end of the pressure guide block 100, and the first seal 111 is arranged in the groove to stabilize the first seal 111 and make the outer surface of the first seal 111 flush with the surface of the other sidewalls of the pressure guide block 100, thereby saving the radial space occupied by the first seal 111 and reducing the radial size of the pressure guide block 100.

[0124] Since the first end and the second end of the pressure guide block 100 are opposite to each other, the pressure medium enters the first through hole 101 in the pressure guide block 100 through the second end of the pressure guide block 100 and flows out through the first end of the pressure guide block 100. Compared with the way in which the pressure medium enters the pressure guide block 100 from the sidewall between the first end and the second end of the pressure guide block 100, the structural stability of the pressure guide block 100 during the process of the pressure medium entering the pressure guide block 100 can be improved, and the deflection or tilting of the pressure guide block 100 in the z direction during the pressure process can be alleviated or avoided, thereby improving the connection sealing between the first end of the pressure guide block 100 and the pressure instrument 20 during the calibration process and improving the accuracy of the calibration result.

[0125] Referring to FIGS. 1 to 8, Figure 1 and Figure 2 The pressure connection device 10 of the embodiment of the present application includes a pressure bearing block 200, and a first end of the pressure bearing block 200 is inwardly recessed to form a first piston cavity 210. The first piston structure 110 is movably connected to the inner side of the first piston cavity 210 to form a first pressure cavity with variable volume in the first piston cavity 210.

[0126] In some examples, the pressure bearing block 200 is located at the second end of the pressure guide block 100, and the first end of the pressure bearing block 200 (i.e., the end facing the pressure guide block 100) is inwardly recessed to form the first piston cavity 210. The first piston structure 110 at the second end of the pressure guide block 100 is located in the first piston cavity 210 and can move in the z direction along the first piston cavity 210 under the action of an external force, for example, the action of the medium pressure, to form a first pressure cavity with variable volume in the first piston cavity 210. The first through hole 101 formed on the pressure guide block 100 is in communication with the first pressure cavity.

[0127] It can be understood that the first seal 111 is arranged to make the first piston structure 110 in sealing contact with the sidewall of the first piston cavity 210, thereby improving the sealing of the first pressure cavity and ensuring that the stress of the medium pressure in the first pressure cavity on the first piston structure 110 is within a controllable range and that the pressure medium in the first pressure cavity can enter the pressure instrument 20 through the first through hole 101 to a greater extent, thereby ensuring the accuracy of the calibration result of the pressure instrument 20.

[0128] The first piston structure 110 has a first pressure bearing area S1 in the first pressure cavity. The first pressure bearing area corresponds to a first pressure bearing surface 112 between an outer ring of the first piston structure 110 and an inner ring of the first piston structure 110. It can be understood that the outer ring of the first piston structure 110 refers to the outer wall of the first sealing member 111, and the inner ring of the first piston structure 110 refers to the hole wall of the first through hole 101.

[0129] Since the first end of the pressure guide block 100 is opposite to the second end, the first pressure bearing surface 112 of the first piston structure 110 is subjected to the pressure of the medium in the first pressure cavity or the force of the pressure bearing block 200, both of which are in the z direction and upward, i.e., toward the pressure instrument 20, so that the first end of the pressure guide block 100 can abut against the pressure instrument 20 after the first piston structure 110 is subjected to the above-mentioned forces. The force of the medium in the first pressure cavity or the force of the pressure bearing block 200 is fully converted into the force of the pressure guide block 100 abutting against the pressure instrument 20, which can improve the connection sealing between the pressure guide block 100 and the pressure instrument 20, and avoid the force of the medium in the first pressure cavity or the force of the pressure bearing block 200 exerting force on the pressure guide block 100 in other directions intersecting the z direction, which affects the connection stability and sealing between the pressure guide block 100 and the pressure instrument 20, or affects the stability of other structures around the pressure guide block 100.

[0130] In some examples, the second end of the pressure bearing block 200, i.e., the end away from the pressure guide block 100, forms a second piston structure 220. The pressure bearing block 200 is provided with a second through hole 201, and the first piston cavity 210 is in communication with the second piston structure 220 through the second through hole 201. The first end of the pressure bearing block 200 is opposite to the second end of the pressure bearing block 200.

[0131] Referring to Figure 4 As shown in the figure, the side wall of the second end of the pressure bearing block 200 can be provided with a second sealing member 221, so that the part of the pressure bearing block 200 provided with the second sealing member 221 forms the second piston structure 220. The second through hole 201 in the pressure bearing block 200 penetrates the second piston structure 220, so that the pressure medium enters the first pressure cavity in the pressure bearing block 200 from the second piston structure 220 at the second end of the pressure bearing block 200.

[0132] As an example, the second sealing member 221 can be a sealing ring or a sealing coating arranged on the side wall of the second end of the pressure bearing block 200. In some examples, an annular groove can be formed on the side wall of the second end of the pressure bearing block 200, and the second sealing member 221 is arranged in the groove to stabilize the second sealing member 221. In addition, the outer surface of the second sealing member 221 can be flush with the surface of the other side walls of the pressure bearing block 200, so as to save the radial space of the pressure bearing block 200 occupied by the second sealing member 221 and reduce the radial size of the pressure bearing block 200.

[0133] Since the first end and the second end of the pressure block 200 are opposite to each other, the pressure medium enters the second through hole 201 inside the pressure block 200 through the second end of the pressure block 200 and enters the first pressure cavity. Compared with the mode that the pressure medium enters the pressure block 200 from the side wall between the two ends of the pressure block 200, the structural stability of the pressure block 200 in the process of entering the pressure block 200 can be improved, and the deviation or tilting of the pressure block 200 in the z direction in the process of being pressed can be relieved or avoided.

[0134] In addition, the first pressure cavity is located in the extension direction of the second through hole 201 and is consistent with the movement direction of the first piston structure 110, so that the pressure medium entering the first pressure cavity through the second through hole 201 can press the first pressure surface 112 under the sealing action of the first piston structure 110 and the first piston cavity 210, avoiding the influence of the pressure medium entering the first pressure cavity from the side of the pressure block 100 or the side of the pressure block 200 on the sealing of the pressure block 100 and the pressure block 200 or other structures.

[0135] The part of the pressure block 200 in the first pressure cavity towards the first piston structure 110 has a second pressure area S2. The second pressure area corresponds to a second pressure surface 222, which is the area between the inner wall of the first piston cavity 210 and the hole wall of the second through hole 201.

[0136] Referring to Figure 1 The pressure connection device 10 of the embodiment of the application further includes a base 300. The first end of the base 300 is inwardly recessed to form a second piston cavity 310. The second piston structure 220 is movably connected to the inner side of the second piston cavity 310 to form a second pressure cavity with variable volume in the second piston cavity 310. The second end of the base 300 is provided with a medium input port 302. A third through hole 301 is arranged in the base 300. The medium input port 302 and the second piston cavity 310 are in communication through the third through hole 301, so that the pressure medium is transmitted to the second piston cavity 310 through the medium input port 302 and the third through hole 301 to press the second piston structure 220 of the pressure block 200. The pressure medium can enter the pressure instrument 20 through the second through hole 201, the first piston cavity 210 and the first through hole 101 after entering the second piston cavity 310. In addition, the pressure medium can press the first piston structure 110 of the pressure block 100 after entering the first piston cavity 210 through the second through hole 201, so that the pressure block 100 abuts against the pressure instrument 20.

[0137] In some examples, the base 300 is located at the second end side of the pressure block 200, and the first end of the base 300 (i.e. the end towards the pressure block 200) can be inwardly recessed to form a second piston cavity 310, the second piston structure 220 at the second end of the pressure block 200 is located in the second piston cavity 310, and can move in the z direction along the second piston cavity 310 under the action of an external force, for example, under the action of the medium pressure, to form a second pressure chamber with a variable volume in the second piston cavity 310. Among them, the third through hole 301 formed on the base 300 is in communication with the second pressure chamber.

[0138] It can be understood that the second sealing member 221 is arranged to make the second piston structure 220 in sealing contact with the side wall of the second piston cavity 310, thereby improving the sealing performance of the second pressure chamber, so as to ensure that the force of the medium pressure in the second pressure chamber on the second piston structure 220 is within a controllable range, and also to ensure that the pressure medium in the second pressure chamber can enter the first pressure chamber and the first through hole 101 to a greater extent through the second through hole 201, thereby ensuring the accuracy of the calibration result of the pressure instrument 20.

[0139] Among them, the second piston structure 220 has a third pressure bearing area S3 in the second pressure chamber. The third pressure bearing area S3 corresponds to a third pressure bearing surface 223, which is the area between the outer circle of the second piston structure 220 and the inner circle of the second piston structure 220. It can be understood that the outer circle of the second piston structure 220 refers to the outer wall of the second sealing member 221, and the inner circle of the second piston structure 220 refers to the hole wall of the second through hole 201.

[0140] It can be understood that the second pressure bearing area S2 is smaller than the third pressure bearing area S3.

[0141] Since the first end and the second end of the pressure block 200 are in opposite directions, the third pressure bearing surface 223 of the second piston structure 220 is subjected to the medium pressure in the second pressure chamber in the z direction upward, i.e. in the direction of the pressure block 100 and the pressure instrument 20, so that the pressure block 200 can move towards the first piston structure 110 after the second piston structure 220 is subjected to the medium force, and abut against the first piston structure 110. The force of the medium pressure in the second pressure chamber can be completely converted into the force of abutting against the first piston structure 110, and the first piston structure 110 can convert the abutting force of the pressure block 200 into the force of abutting against the pressure instrument 20, thereby improving the connection sealing performance between the pressure block 100 and the pressure instrument 20, and avoiding the force of the medium pressure in the second pressure chamber acting on the pressure block 200 in other directions intersecting with the z direction, thereby affecting the abutting of the pressure block 200 against the pressure block 100, and improving the connection stability and sealing performance between the pressure block 100 and the pressure instrument 20, and reducing the influence on the stability of other structures around the pressure block 100 and the pressure block 200.

[0142] In some examples, the second end of the base 300 can be opposite to the direction of the first end, for example, the second end of the base 300 can be a bottom of the base 300 facing away from the first end. Of course, the second end of the base 300 can also be a side wall of the base 300, which intersects the first end of the base 300. The position of the second end of the base 300, i.e. the position of the medium inlet 302, is not limited in the embodiments of the present application. In actual calibration, the base 300 can be vertically fixed on the installation table, so that the z direction is perpendicular to the installation table. Of course, in some examples, the base 300 can also be horizontally arranged on the installation table, so that the z direction is parallel to the installation table. In some examples, the base 300 can also be fixed on the installation table, and the pressure connection device 10 or other parts of the pressure connection device 10 can be held to calibrate the pressure instrument 20. The position of the pressure connection device 10 relative to the installation table during calibration is not limited in the embodiments of the present application.

[0143] Referring to Figures 1 to 4 The pressure connection device 10 of the embodiments of the present application also includes a fixing assembly 400, which movably sheaths the pressure guide block 100, one end of the fixing assembly 400 is connected with the base 300, and the other end of the fixing assembly 400 forms an opening and closing space 401 extending from the first end of the pressure guide block 100.

[0144] The fixing assembly 400 can be switched between an unlocked state and a locked state, for example, the fixing assembly 400 can move relative to the pressure guide block 100 to switch between the unlocked state and the locked state. When the fixing assembly 400 is in the unlocked state, the fixing assembly 400 can allow the pressure instrument 20 to enter the opening and closing space 401, so that the pressure instrument 20 is connected with the pressure guide block 100; when the fixing assembly 400 is in the locked state, the fixing assembly 400 clamps on the pressure instrument 20, so that the pressure instrument 20 is stably fixed on the first end of the pressure guide block 100.

[0145] For example, the fixing assembly 400 can be an elastic clamping jaw movably connected to the base 300. When the pressure instrument 20 needs to be assembled, the elastic clamping jaw can be extended outward away from the axis of the pressure guide block 100 to increase the radial size of the opening and closing space 401, and then the connecting end of the pressure instrument 20 is inserted into the opening and closing space 401 and abuts or connects with the first end of the pressure guide block 100. Then the elastic clamping jaw is retracted towards the axis of the pressure guide block 100 and clamps the outer wall of the connecting end of the pressure instrument 20, so that the pressure instrument 20 is stably assembled in the fixing assembly 400, thereby improving the connection stability of the pressure instrument 20 and the first end of the pressure guide block 100 and improving the sealing effect between the pressure instrument 20 and the first end of the pressure guide block 100.

[0146] The fixing assembly 400 of the embodiments of the present application can also have other structures, for exampleFigure 5 The cooperation structure of the locking block 410 and the shell 420 shown in the middle is described in detail hereinafter. The embodiments of the present application do not limit the setting mode of the fixing assembly 400, as long as the pressure instrument 20 can be stably fixed on the pressure connecting device 10.

[0147] The pressure medium enters the second pressure cavity through the medium input port 302. When the medium pressure of the second pressure cavity is greater than or equal to the preset value, the pressure block 200 moves along the second piston cavity 310 to the opening and closing space 401 and abuts against the pressure guide block 100.

[0148] Exemplarily, when the pressure medium enters the pressure connecting device from the medium input port 302, the pressure medium enters the first pressure cavity and the second pressure cavity. At this time, the upward force F=PS1+f 10 acted on the pressure guide block 100, wherein P represents the pressure of the pressure medium (pressure), S1 represents the pressure area of the first piston structure, f 10 represents the elastic force of the first elastic member 500. Since the pressure areas of the first piston cavity 210 and the second piston structure 220 are different, the pressure medium generates an upward force on the pressure block 200, and the pressure block 200 moves in the upward direction, that is, in the direction of the opening and closing space 401. When the pressure block 200 is in contact with the first locking member 610, the pressure block 200 pushes the first locking member 610 to move upward, thereby compressing the first elastic member 500. At this time, the upward force F=PS1+f 11 acted on the pressure guide block 100, wherein f 11 > 0. 10 The medium pressure of the pressure medium continues to increase, and the pressure block 200 continues to move upward. When the pressure block 200 is in contact with the pressure guide block 100, the first elastic member 500 reaches the maximum compression amount. At this time, the upward force F=PS1+f 12 acted on the pressure guide block 100, wherein f 12 > 0. 11 At this time, f 11P(S3-S2)-G, wherein S3 represents the pressure bearing area of the second piston structure, S2 represents the pressure bearing area of the pressure bearing block 200 in the first pressure cavity, and G represents the gravity of the pressure bearing block 200. Subsequently, if the medium pressure of the pressure medium continues to increase, the pressure bearing block 200 abuts against the pressure leading block 100, and the pressure leading block 100 is subjected to an upward force F = P(S3-S2+S1)-G. It can be understood that, when the pressure bearing block 200 abuts against the pressure leading block 100, even if the increase of the medium pressure itself is not considered, the pressure leading block 100 can be subjected to a greater upward force due to the additional force bearing area S3-S2, so as to improve the sealing effect between the pressure leading block 100 and the pressure instrument 20. Further, due to the arrangement of the first elastic member 500, the pressure leading block 100 can be provided with an upward elastic force in addition to the medium pressure, and the upward force can be continuously changed along with the movement of the pressure bearing block 200, so as to reduce the sudden change of the sealing pressure and improve the stability of the sealing effect.

[0149] Exemplarily, in the pressure calibration process, the pressure medium can enter the second pressure cavity through the medium input port 302 and the third through hole 301 on the base 300, and a part of the pressure medium can enter the pressure instrument 20 through the second through hole 201, the first piston cavity 210 and the first through hole 101, so as to calibrate the pressure detection result of the pressure instrument 20. In addition, after the pressure medium enters the second pressure cavity, the medium pressure will be applied to the second piston structure 220 towards the opening and closing space 401.

[0150] When the medium pressure P is small, i.e. less than a preset value, for example, P(S3-S2) < G, wherein G represents the gravity of the pressure bearing block 200, the medium pressure will not drive the second piston structure 220 to move in the second piston cavity 310, so that the pressure medium entering the first pressure cavity will apply an upward force (i.e. towards the opening and closing space 401) to the first piston structure 110 of the pressure leading block 100, so as to make the pressure leading block 100 abut against the pressure instrument 20, improve the sealing pre-tightening force between the pressure leading block 100 and the pressure instrument 20, and the force also increases with the increase of the medium pressure, so as to ensure the connection sealing between the pressure leading block 100 and the pressure instrument 20 under the low pressure calibration condition, thereby ensuring the accuracy of the calibration result of the pressure instrument 20.

[0151] For example, the upward force F = PS1 applied to the pressure leading block 100, i.e. the medium pressure directly acts on the first pressure bearing surface 112 of the first piston structure 110 and applies an upward force to the pressure leading block 100.

[0152] If the medium pressure P is greater, i.e. greater than or equal to a preset value, for example, P(S3-S2)>G, the pressure block 200 will rise under the action of the medium pressure in the second pressure cavity, the volume of the second pressure cavity increases, and the volume of the first pressure cavity decreases, until the pressure block 200 and the pressure block 100 abut in the upward direction, i.e. the z direction, so that the pressure block 100 is pressed upward against the pressure instrument 20 under the abutting action of the pressure block 200, to increase the sealing pre-tightening force between the pressure block 100 and the pressure instrument 20. At this time, the upward force on the pressure block 100 is F=P(S1+S3-S2)-G.

[0153] It can be seen that when the medium pressure is small, the sealing pre-tightening force brought by the medium pressure is small. Compared with the upward force on the pressure block 100 when the medium pressure is small, when the medium pressure is large, the larger force area is used, i.e. the area difference between the internal second pressure surface 222 and the external third pressure surface 223 of the pressure block 200, to increase the upward force on the pressure block 100, compared with the pressure connection device 10 in the related art, the sealing effect between the pressure block 100 and the pressure instrument 20 is improved, and as the medium pressure increases, the force of the pressure block 200 on the pressure block 100 towards the pressure instrument 20 also increases, thereby improving the connection and sealing between the medium outlet 102 of the pressure connection device 10 of the embodiment of the present application and the pressure instrument 20 under high pressure calibration conditions, and improving the accuracy of the calibration result of the pressure instrument 20. In addition, compared with the upward force on the pressure block 100 when the medium pressure is large, when the medium pressure is small, a smaller force area is used, i.e. the pressure surface of the first piston structure, to provide a smaller sealing pre-tightening force to the pressure block 100, and correspondingly, the locking force on the pressure instrument 20 is smaller, and the friction between the fixing assembly and the pressure instrument 20 is also smaller, so that when the pressure instrument 20 needs to be removed or replaced, the fixing assembly can be easily switched from the locked state to the unlocked state.

[0154] Although the embodiment of the present application uses the medium pressure to abut the pressure block 200 and the pressure block 100, no additional pipe for leading out the medium pressure is provided, compared with configuring a special pressure control pipe, or leading the medium pressure into the outer periphery of the pressure block 100 through the pipe to form a pneumatic / hydraulic structure, which can reduce the risk of pressure leakage and improve the accuracy of the calibration result of the pressure instrument 20 by the medium pressure.

[0155] Reference Figure 4As shown, in some examples, the first through hole 101 is coaxial with the first piston structure 110, that is, the first through hole 101 is arranged on the central axis of the first piston structure 110, so that the first bearing surface of the first piston structure 110 is subjected to the medium pressure in the first pressure cavity more uniformly and symmetrically, thereby ensuring that the first piston structure 110 can move along the axis of the first piston structure 110 when subjected to the medium pressure in the first pressure cavity, relieving or avoiding the occurrence of deflection of the first piston structure 110, thereby ensuring the sealing effect between the first piston structure 110 and the first piston cavity 210, and the sealing effect between the pressure block 100 and the pressure instrument 20, and thereby improving the accuracy of the calibration result of the pressure connection device 10 on the pressure instrument 20.

[0156] In some examples, the second through hole 201 is coaxial with the second piston structure 220, that is, the second through hole 201 is arranged on the central axis of the second piston structure 220, so that the third bearing surface of the second piston structure 220 is subjected to the medium pressure in the second pressure cavity more uniformly and symmetrically, and the second bearing surface 222 of the pressure block 200 in the first pressure cavity is subjected to the medium pressure in the first pressure cavity more uniformly and symmetrically, thereby ensuring that the second piston structure 220 can move along the axis of the second piston structure 220 when subjected to the medium pressure in the second pressure cavity, relieving or avoiding the occurrence of deflection of the second piston structure 220, thereby ensuring the sealing effect between the second piston structure 220 and the second piston cavity 310, and the sealing effect between the pressure block 200 and the first piston structure 110.

[0157] In some examples, the first through hole 101 is coaxial with the second through hole 201, that is, the first piston structure 110 is located on the central axis of the pressure block 200, so that during the movement of the second piston structure 220 of the pressure block 200 along the second piston cavity 310 to the opening and closing space 401, after the second bearing surface 222 of the pressure block 200 abuts against the first bearing surface 112 of the pressure block 100, the pressure block 200 can more effectively transmit the received medium pressure to the pressure block 100, so that the pressure block 100 moves along the axis of the pressure block 200, improving the controllability of the force of the pressure block 200 on the pressure block 100.

[0158] In addition, when the pressure block 200 abuts against the pressure block 100, the first through hole 101 and the second through hole 201 remain in communication, ensuring that the pressure medium in the second pressure cavity enters the pressure instrument 20 through the second through hole 201 and the first through hole 101, and calibrating the qualification of the pressure instrument 20.

[0159] In some examples, the third through hole 301 is coaxial with the second piston cavity 310, and the force of the medium pressure in the second piston cavity 310 on the surface of the base 300 towards the first piston cavity 210 is more uniform and symmetrical, so that the position stability of the base 300 relative to the pressure block 200 can be improved, and it is ensured that the base 300 will not be skewed left and right relative to the pressure block 200.

[0160] In addition, when the first through hole 101 is coaxial with the first piston structure 110, the second through hole 201 is coaxial with the second piston structure 220, the first through hole 101 is coaxial with the second through hole 201, and the third through hole 301 is coaxial with the second piston cavity 310, so that the third through hole 301, the second piston structure 220, the second through hole 201, the first piston structure 110 and the first through hole 101 on the base 300 can be on the same axis, on the one hand, it is ensured that the pressure medium entering the second piston cavity 310 through the third through hole 301 can efficiently enter the pressure instrument 20 through the second through hole 201 and the first through hole 101, and on the other hand, it is ensured that the pressure block 200 or the pressure guide block 100 can move along the axis of the pressure guide block 100 without skewing.

[0161] Figure 5 is Figure 4 A local enlarged view of part A in FIG. 10. Referring to FIGS. 10 and 11, in some examples, the pressure connection device 10 can further include a first elastic member 500. One end of the first elastic member 500 is connected to the pressure guide block 100, and the other end of the first elastic member 500 is connected to the pressure block 200. Figure 4 and Figure 5 In some examples, one end of the first elastic member 500 can be directly fixedly connected to the pressure guide block 100, or can abut against the side wall of the pressure guide block 100. For example, the first elastic member 500 can be a spring, at least part of the spring is sleeved on the pressure guide block 100, and one end of the spring is connected to the side wall of the pressure guide block 100 or abuts against the limiting protrusion 423 on the side wall of the pressure guide block 100 to limit one end of the first elastic member 500. The connection mode between the first elastic member 500 and the pressure guide block 100 is not limited in the embodiments of the present application.

[0162] In addition, in some examples, the other end of the first elastic member 500 can be fixedly connected to the pressure block 200, or can abut against the pressure block 200. For example, the other end of the first elastic member 500 abuts against the end face of the pressure block 200 towards the opening and closing space 401 to limit the other end of the first elastic member 500. The connection mode between the first elastic member 500 and the pressure block 200 is not limited in the embodiments of the present application.

[0163] In addition, in some examples, the other end of the first elastic member 500 can be fixedly connected to the pressure block 200, or can abut against the pressure block 200. For example, the other end of the first elastic member 500 abuts against the end face of the pressure block 200 towards the opening and closing space 401 to limit the other end of the first elastic member 500. The connection mode between the first elastic member 500 and the pressure block 200 is not limited in the embodiments of the present application.

[0164] When the pressure instrument 20 is connected with the pressure block 100, the first elastic member 500 is in a compressed state to apply an elastic force to the pressure block 100 towards the opening and closing space 401. When the pressure block 200 moves along the second piston cavity 310 towards the opening and closing space 401, the elastic potential energy of the first elastic member 500 increases, so that the elastic force of the first elastic member 500 to the pressure block 100 towards the opening and closing space 401 also increases, thereby increasing the sealing effect between the pressure block 100 and the pressure instrument 20.

[0165] It can be understood that when the pressure instrument 20 is connected with the pressure block 100, the first elastic member 500 is in a compressed state, and the first elastic member 500 will apply an elastic force to the pressure block 100 towards the opening and closing space 401, and the first elastic member 500 will also apply an elastic force to the pressure block 200 away from the opening and closing space 401.

[0166] For example, when the medium pressure is less than the preset value, for example, P(S3-S2)<G+F T1 , the pressure block 200 remains stationary relative to the base 300, and after the pressure medium enters the first pressure cavity through the second through hole 201, the pressure block 100 will be subjected to the medium pressure and the elastic force of the first elastic member 500 towards the opening and closing space 401, i.e. the pressure block 100 is subjected to an upward force F=PS1+F T1 .

[0167] Wherein, F T1 represents the elastic force of the first elastic member 500.

[0168] For example, when the medium pressure is greater than or equal to the preset value, for example, P(S3-S2)>G+F T1 , the pressure block 200 rises, the volume of the first pressure cavity decreases, and the pressure block 200 and the pressure block 100 abut in the upward direction, and the pressure block 100 is subjected to an upward force F=P(S1+S3-S2)-G.

[0169] It can be understood that F T1 when the medium pressure is greater than or equal to the preset value is greater than F T1 when the medium pressure is less than the preset value, so that the upward force of the pressure block 100 under different medium pressures is increased as a whole, the sealing effect between the pressure block 100 and the pressure instrument 20 is improved, and the force of the pressure block 100 towards the pressure instrument 20 under high pressure calibration conditions is increased compared to low pressure, thereby improving the sealing effect between the pressure block 100 and the pressure instrument 20 under high pressure calibration conditions.

[0170] In other examples, one end of the first elastic member 500 is connected with the pressure block 100, and the other end of the first elastic member 500 is connected with the base 300.

[0171] It should be noted that the connection between one end of the first elastic member 500 and the pressure guide block 100 can refer to the above examples, and the connection between the other end of the first elastic member 500 and the base 300 can be fixed connection or abutment, for example, the other end of the first elastic member 500 can be fixedly connected to the inner wall of the base 300, or can abut on the protruding part formed on the inner wall of the base 300 to limit the other end of the first elastic member 500.

[0172] When the pressure instrument 20 is connected to the pressure guide block 100, the first elastic member 500 is in a compressed state to exert an elastic force on the pressure guide block 100 towards the opening and closing space 401. It can be understood that since the first elastic member 500 is not connected to the pressure receiving block 200, the pressure receiving block 200 will not be subjected to the elastic force of the first elastic member 500.

[0173] For example, when the medium pressure is less than the preset value, for example, P(S3-S2)<G, the pressure receiving block 200 remains stationary relative to the base 300, and after the pressure medium enters the first pressure cavity through the second through hole 201, the pressure guide block 100 will be subjected to the medium pressure and the elastic force of the first elastic member 500 towards the opening and closing space 401, that is, the upward force on the pressure guide block 100 is F=P(S1+S3-S2)+F T1 .

[0174] For example, when the medium pressure is greater than or equal to the preset value, for example, P(S3-S2)>G, the pressure receiving block 200 rises, the volume of the first pressure cavity decreases, and the pressure guide block 100 is subjected to an upward force F=P(S1+S3-S2)+F T1 . In this way, the upward force on the pressure guide block 100 under different medium pressures is increased as a whole, and the sealing effect between the pressure guide block 100 and the pressure instrument 20 is improved.

[0175] It can be understood that during the upward movement of the pressure receiving block 200, the elastic potential energy of the first elastic member 500 does not change, and therefore F T1 when the medium pressure is greater than or equal to the preset value is equal to F T1 when the medium pressure is less than the preset value.

[0176] Figure 6 is a cross-sectional view of a pressure connection device provided by an embodiment of the present application in an unlocked state, Figure 7 is Figure 6 is a partial enlarged view of B in FIG. 4A. Referring to FIG. 4B, in some examples, the fixing assembly 400 can include a locking block 410, and the inner side of the locking block 410 surrounds the opening and closing space 401. Figures 4 to 7

[0177] ​In some examples, the locking blocks 410 can be two or more, and one end of the plurality of locking blocks 410 can extend out of the pressure guide block 100 and can be arranged at intervals around the axis of the pressure guide block 100, and the plurality of locking blocks 410 can be enclosed towards the inside of the axis of the pressure guide block 100 to form the opening and closing space 401 of the pressure instrument 20.

[0178] For example, the plurality of locking blocks 410 can be arranged uniformly around the axis of the pressure guide block 100 to improve the uniformity of the force applied to the pressure instrument 20 and to ensure that the pressure instrument 20 does not tilt left or right.

[0179] In some examples, the fixing assembly 400 can include a housing 420 that can be movably sleeved on the outside of the locking blocks 410 (the side away from the opening and closing space 401) to drive the locking blocks 410 to move away from or close to the axis of the pressure guide block 100.

[0180] Referring to Figure 6 For example, when the housing 420 is at the first axial position of the locking blocks 410, the inner diameter of the locking blocks 410 is greater than the outer diameter of the pressure instrument 20 to allow the pressure instrument 20 to enter the opening and closing space 401. Referring to Figure 4 For example, when the housing 420 is at the second axial position of the locking blocks 410, the inner diameter of the locking blocks 410 is less than or equal to the outer diameter of the pressure instrument 20, and the locking blocks 410 clamp the pressure instrument 20.

[0181] It should be noted that the inner diameter of the locking blocks 410 refers to the inner diameter of the annular structure formed by the plurality of locking blocks 410, i.e., the diameter of the opening and closing space 401.

[0182] For example, when the pressure instrument 20 needs to be assembled, the housing 420 can be driven to move downward along the outside of the locking blocks 410, so that the locking blocks 410 open away from the axis of the pressure guide block 100, and the inner diameter of the locking blocks 410, i.e., the size of the opening and closing space 401, gradually increases. When the housing 420 moves to the first axial position of the locking blocks 410, the inner diameter of the locking blocks 410 is greater than the outer diameter of the pressure instrument 20, the pressure instrument 20 is inserted into the opening and closing space 401 and connected to the first end of the pressure guide block 100. Then, the housing 420 can be driven to move upward along the outside of the locking blocks 410, so that the locking blocks 410 close to the axis of the pressure guide block 100, and the inner diameter of the locking blocks 410, i.e., the size of the opening and closing space 401, gradually decreases. When the housing 420 moves to the second axial position of the locking blocks 410, the inner diameter of the locking blocks 410 is less than or equal to the outer diameter of the pressure instrument 20, i.e., the locking blocks 410 are clamped on the outer wall of the pressure instrument 20 to fix the pressure instrument 20.

[0183] In some examples, the inner side of the locking block 410 can be provided with a first limiting structure such as an internal thread, a limiting ring, or a limiting tooth, etc. After the shell 420 drives the locking block 410 to converge towards the axis direction of the pressure block 100, the limiting structure on the locking block 410 can cooperate with a second limiting structure such as a thread, a clamping groove, or a limiting tooth, etc. on the pressure instrument 20, so that the limiting structure on the locking block 410 is clamped on the side wall of the pressure instrument 20 to limit the up and down movement of the pressure instrument 20 along the z direction, and to fix the pressure instrument 20.

[0184] In some examples, one end of the locking block 410 can be movably arranged on the base 300, so that the locking block 410 can be opened or tightened relative to the pressure block 100.

[0185] For example, one end of the locking block 410 can be rotatably arranged on the base 300, and the locking block 410 rotates along an arc trajectory under the action of the shell 420 to switch between the locked state and the unlocked state.

[0186] For another example, one end of the locking block 410 can move relative to the base 300 in a direction perpendicular to the axis direction of the pressure block 100 (i.e. the x direction), so that the locking block 410 moves horizontally along a straight line under the action of the shell 420 to switch between the locked state and the unlocked state.

[0187] By arranging the locking block 410 to move horizontally in a direction perpendicular to the axis direction of the pressure block 100, the horizontal opening and tightening of the locking block 410 can be realized, which can ensure that the first limiting structure on the inner side of the locking block 410 does not deviate in the axial direction during the movement from the unlocked state to the locked state, so that the locking block 410 can accurately align with the second limiting structure on the outer wall of the pressure instrument 20 when reaching the locked state, so that the first limiting structure and the second limiting structure are accurately matched to limit the pressure instrument 20 in the axial direction.

[0188] In some examples, one end of the locking block 410 can be movably arranged on the base 300 directly, for example, one end of the base 300 is provided with a horizontal sliding groove, the slot of the horizontal sliding groove faces the pressure block 100 or faces away from the pressure block 100, and the slot cavity of the horizontal sliding groove extends in a direction perpendicular to the axis direction of the pressure block 100. One end of the locking block 410 extends into the horizontal sliding groove and can move horizontally along the horizontal sliding groove to switch between the locked state and the unlocked state.

[0189] Reference Figure 4As shown, in some examples, in order to simplify the structure of the base 300, the fixing assembly 400 can further include an assembly support 700 which is limitingly connected or fixedly connected with the base 300, the assembly support 700 is at least partially arranged inside the shell 420, and the locking block 410 is mounted on the assembly support 700, for example, a horizontal sliding groove is arranged on the assembly support 700, so that one end of the locking block 410 moves along the horizontal sliding groove on the assembly support 700.

[0190] For example, the assembly support 700 includes a cylindrical portion with openings at both upper and lower ends, and a ring-shaped portion 720 extends outwardly on the outer wall of the cylindrical portion, the ring-shaped portion 720 can be fixed on the top of the base 300, or a clamping groove 730 can be formed below the ring-shaped portion 720, when the assembly support 700 is assembled in the shell 420, the ring-shaped portion 720 is arranged on the top of the base 300, and the clamping portion of one end of the base 300 extends into the clamping groove 730 of the assembly support 700, so as to limit the base 300 on the assembly support 700.

[0191] The outer wall of the cylindrical portion further extends outwardly to form an extension portion 740 above the ring-shaped portion 720, and the extension portion 740 forms a horizontal sliding groove between the ring-shaped portion 720. It can be understood that the mounting opening of the horizontal sliding groove faces away from the pressure block 100, one end of the locking block 410 is formed with a bent portion, the bent portion extends into the horizontal sliding groove through the mounting opening of the horizontal sliding groove, and the bent portion of the locking block 410 moves along the horizontal sliding groove to expand or contract.

[0192] The maximum displacement of the locking block 410 in the radial direction is the extension length of the horizontal sliding groove. It can be understood that the extension length of the horizontal sliding groove is determined by the one with the minimum extension length among the ring-shaped portion 720 and the extension portion 740, for example, the length of the extension portion 740 is less than the length of the ring-shaped portion 720, and the extension length of the horizontal sliding groove is the length of the extension portion 740, so as to ensure that the bent portion of the locking block 410 can be kept in the horizontal sliding groove, and avoid that the locking block 410 cannot be reset to the locking state due to disengagement from the horizontal sliding groove.

[0193] In some examples, the up and down movement of the shell 420 along the locking block 410 can be driven by an operator or a driving motor and the like.

[0194] Referring to Figure 5 and Figure 7 As shown, in other examples, the pressure connection device 10 can further include a third elastic member 800 arranged between the shell 420 and the base 300, for example, one end of the third elastic member 800 can be fixedly connected or abutted on the shell 420, and the other end of the third elastic member 800 can be fixedly connected or abutted on the base 300.

[0195] Exemplarily, the other end of the third elastic member 800 can be fixedly connected to or abutted against the base 300 via the component bracket 700. For example, the other end of the third elastic member 800 can be fixedly connected to or abutted against the component bracket 700. Exemplarily, the free end of the annular portion of the component bracket 700 extends out of the extension portion 740, and the other end of the third elastic member 800 can be fixedly connected to or abutted against the side of the annular portion of the component bracket 700 facing the extension, so as to limit the other end of the third elastic member 800.

[0196] When the housing 420 moves toward the base 300, the third elastic element 800 is in a compressed state, and the elastic potential energy of the third elastic element 800 increases. Thus, when the downward driving force on the housing 420 is released, the housing 420 can move away from the base 300, i.e., upward, under the elastic force of the third elastic element 800, until it reaches the second axial position. The locking block 410 is tightened to the locked state under the action of the housing 420.

[0197] In some examples, the end of the housing 420 that mates with the base 300 is provided with a limiting structure, which is used to abut against the side of the annular portion of the component support 700 away from the locking block 410 when the housing 420 moves to the second axial position, so as to limit the housing 420 axially.

[0198] For example, when the pressure gauge 20 is connected to the first end of the pressure-applying block 100, the operator releases the housing 420. The housing 420 can move upward under the action of the third elastic member 800 until the limiting structure at one end of the housing 420 abuts against the bottom surface of the annular part between the components. The housing 420 reaches the second axial position and retracts the locking block 410 to clamp it on the side wall of the pressure gauge 20.

[0199] Figure 8 yes Figure 1 A magnified view of a section at point F. Figure 9 yes Figure 2 A magnified view of a section at point D. Figure 10 yes Figure 4 A magnified view of a section at point E. (Refer to...) Figures 8 to 10 As shown, in some examples, the limiting structure may include a limiting protrusion 423 formed by bending one end of the housing 420 inward. The inner circumference of the limiting protrusion 423 is larger than the outer circumference of the component bracket 700. A limiting snap ring 430 is provided between the limiting protrusion 423 and the component bracket 700. The inner circumference of the limiting snap ring 430 is smaller than the outer circumference of the component bracket 700, so that the limiting snap ring 430 is blocked on the side of the component bracket 700 away from the locking block 410, thereby limiting the housing 420.

[0200] In addition, during the assembly of the pressure connection device 10, since the main body of the housing 420 is manufactured as a single piece, the limiting spring 430 can be removed first. Because the inner circumference of the limiting protrusion 423 of the housing 420 is larger than the outer circumference of the component bracket 700, it is convenient to assemble the pressure block 100, the component bracket 700, the first elastic element 500 and the third elastic element 800 from the opening at the end of the housing 420 used to cooperate with the base 300 into the housing 420. After assembly, the limiting spring 430 can be installed to limit the pressure block 100, the base 300, the component bracket 700 and other structures.

[0201] In addition, the design of the retaining ring 430 allows it to be removed from the housing 420 when needed, thus facilitating structural disassembly and maintenance.

[0202] When the pressure connection device 10 is assembled, one end of the limiting snap ring 430 abuts against the outer wall of the base 300, and slides along the outer wall of the base 300 during the up-and-down movement of the housing 420 relative to the locking block 410, so as to improve the radial stability of the housing 420.

[0203] In some examples, a mounting groove may be formed on the inner sidewall of the end of the housing 420 that mates with the base 300, and one end of the retaining spring 430 may be engaged in the mounting groove, located on the side of the retaining protrusion 423 facing the component bracket 700. In other examples, one end of the retaining spring 430 may be glued or welded to the housing 420. This application does not limit the method of fixing the retaining spring 430 to the housing 420.

[0204] Reference Figure 5 and Figures 8 to 10 As shown, the inner wall of the housing 420 is provided with an inwardly protruding first mating part 421. The locking block 410 is provided with a first mating surface 414 and a second mating surface 415 on the side opposite to the pressure block 100, which mate with the first mating part 421. The second mating surface 415 is located between the first mating surface 414 and the base 300 in the axial direction, and the second mating surface 415 is inclined towards the pressure block 100 so that the outer diameter of the second mating surface 415 is smaller than the outer diameter of the first mating surface 414.

[0205] When the housing 420 is in the second axial position of the locking block 410, the first mating part 421 abuts against the first mating surface 414 so that the locking block 410 clamps the pressure gauge 20. When the housing 420 switches from the locked state to the unlocked state, that is, during the downward movement of the housing 420, the first mating part 421 slides along the second mating surface 415. Since the radial position of the housing 420 does not change, the locking block 410 opens away from the pressure block 100 when the first mating part 421 disengages from the first mating surface 414 and contacts the second mating surface 415 with a gradually decreasing outer diameter.

[0206] In addition, the second matching surface 415 is formed as an inclined surface inclined toward the direction close to the pressure block 100. Therefore, when the shell 420 moves downward, the first matching part 421 slides along the second matching surface 415, and the locking block 410 is gradually opened outward, thereby avoiding the sudden change of the outer diameter of the second matching surface 415, the over-fast opening speed of the locking block 410, and the situation that the locking block 410 is easily separated from the horizontal sliding groove, and ensuring that the locking block 410 slowly moves to the unlocking position.

[0207] In addition, the second matching surface 415 is formed as an inclined surface, which also guides the sliding of the first matching part 421 on the surface of the locking block 410, and ensures that the shell 420 stably moves in the axial direction.

[0208] In some examples, the inner side wall of the shell 420 is provided with a second matching part 422 protruding inward, and the second matching part 422 is arranged in the axial direction of the shell 420 and spaced apart from the first matching part 421. Correspondingly, the side of the locking block 410 away from the pressure block 100 is provided with a third matching surface 416 and a fourth matching surface 417 matched with the second matching part 422. The fourth matching surface 417 is located between the third matching surface 416 and the base 300 in the axial direction. The first matching surface 414 and the third matching surface 416 are arranged in parallel, and the second matching surface 415 and the fourth matching surface 417 are arranged in parallel, that is, the fourth matching surface 417 is also inclined toward the direction of the pressure block 100, so that the outer diameter of the fourth matching surface 417 gradually decreases and is smaller than the outer diameter of the third matching surface 416.

[0209] When the shell 420 is located at the second axial position of the locking block 410, the second matching part 422 abuts against the third matching surface 416 to clamp the pressure instrument 20 by the locking block 410. When the shell 420 switches from the locking state to the unlocking state, the second matching part 422 slides along the fourth matching surface 417.

[0210] For example, when the shell 420 is located at the second axial position of the locking block 410, the first matching part 421 of the shell 420 abuts against the first matching surface 414 of the locking block 410, and the second matching part 422 of the shell 420 abuts against the third matching surface 416 of the locking block 410, so as to limit the position of the locking block 410 in the radial direction to the locking position, and clamp the pressure instrument 20 by the locking block 410. When the shell 420 switches from the locking state to the unlocking state, the shell 420 moves downward, the first matching part 421 slides downward along the second matching surface 415, and the second matching part 422 slides downward along the fourth matching surface 417.

[0211] Correspondingly, when the shell 420 moves from the unlocking state to the locking state, the shell 420 moves upward, the first fitting part 421 slides upward along the second fitting surface 415, and the second fitting part 422 slides upward along the fourth fitting surface 417, until the shell 420 reaches the second axial position, the first fitting part 421 abuts against the first fitting surface 414, and the second fitting part 422 abuts against the third fitting surface 416, so that the locking block 410 is folded to the locking state and clamps the pressure instrument 20.

[0212] By arranging the first fitting surface 414 and the third fitting surface 416 in parallel, when the shell 420 abuts against the first fitting surface 414 and the third fitting surface 416, the locking block 410 does not tilt in the radial direction, so that the inner side wall of the locking block 410 can effectively apply force to the pressure instrument 20, and the clamping force of the locking block 410 on the pressure instrument 20 is improved.

[0213] By arranging the second fitting surface 415 and the fourth fitting surface 417 in parallel, when the shell 420 moves upward or downward, the shell 420 can slide along the parallel second fitting surface 415 and third fitting surface 416, so that the locking block 410 moves horizontally in the radial direction when switching between the locking state and the unlocking state, and thus the first limiting structure on the inner side of the locking block 410 can accurately cooperate with the second limiting structure on the pressure instrument 20 in the locking state, so that the pressure instrument 20 is limited in the axial direction.

[0214] In some examples, when the shell 420 is in the first axial position, the first fitting part 421 can cooperate with the second fitting surface 415, and the second fitting part 422 can cooperate with the fourth fitting surface 417.

[0215] In other examples, the side of the second fitting surface 415 away from the first fitting surface 414 has a fifth fitting surface 418, which is a vertical surface parallel to the axis of the pressure block 100, and the side of the fourth fitting surface 417 away from the third fitting surface 416 has a sixth fitting surface, which is a vertical surface parallel to the axis of the pressure block 100. When the shell 420 is in the first axial position, the first fitting part 421 can be separated from the second fitting surface 415 and in contact with the fifth fitting surface 418, and the second fitting part 422 can be separated from the fourth fitting surface 417 and in contact with the sixth fitting surface. In this way, the abutting stability of the first fitting part 421 and the second fitting part 422 with the locking block 410 when the shell 420 is in the first axial position is improved, and the position of the locking block 410 in the radial direction is more stable.

[0216] Exemplarily, the end faces of the first and second fitting portions 421 and 422 for fitting with the locking block 410 are vertical faces, and the first and third fitting faces 414 and 416 are also vertical faces, so as to increase the contact area of the shell 420 with the locking block 410 when the shell 420 is in the second axial position, thereby improving the stability effect on the locking block 410 and ensuring that the locking block 410 stably clamps the pressure instrument 20.

[0217] In some examples, one end of the third elastic member 800 abuts against or is connected to one side of the second fitting portion 422 facing the base 300, and the other end of the third elastic member 800 abuts against or is connected to one side of the annular portion of the assembly support 700 facing the second fitting portion 422, so as to limit the third elastic member 800 between the shell 420 and the base 300.

[0218] With reference to Figure 10 In some examples, the pressure connection device 10 further includes a locking structure 600 movably arranged between the pressure receiving block 200 and the shell 420. When the pressure receiving block 200 moves along the second piston cavity 310 toward the opening and closing space 401, the pressure receiving block 200 pushes the locking structure 600 to move. When the pressure receiving block 200 abuts against the pressure guide block 100, the locking structure 600 is connected with the shell 420 to lock the shell 420 in the locked state. The locking structure 600 is separated from the shell 420 during the movement of the pressure receiving block 200 away from the opening and closing space 401.

[0219] Exemplarily, when the pressure instrument 20 indicates an error, the operator controls the shell 420 to move downward to take out the pressure instrument 20 in a process when the medium pressure is large, or the shell 420 is separated from the locked state due to the operator accidentally touching the shell 420 when the medium pressure is large, and the like, the pressure instrument 20 is prone to be ejected from the pressure connection device 10 under high-pressure medium, which brings safety risks to the operator or the surrounding environment.

[0220] The embodiment of the present application sets the locking structure 600 between the pressure receiving block 200 and the shell 420, so that the pressure receiving block 200 pushes the locking structure 600 to move during the movement of the pressure receiving block 200 toward the opening and closing space 401 under the action of high-pressure medium, and the locking structure 600 cooperates with the shell 420 to lock the shell 420 in the locked state when the pressure receiving block 200 abuts against the pressure guide block 100, thereby improving the stability of the shell 420 in the locked state when the medium pressure is high, improving the clamping stability of the locking block 410 on the pressure instrument 20 during high-pressure calibration, reducing the movement of the shell 420 during high-pressure calibration due to the indication error of the pressure instrument 20 or the accidental touch of the operator, and improving the structural stability and safety of the pressure connection device 10 during high-pressure calibration.

[0221] In addition, when the pressure block 200 moves away from the opening and closing space 401 under the condition that the medium pressure is less than the preset value, the locking structure 600 is separated from the shell 420, so that the operator can move the shell 420 downward under the low pressure condition to make the locking block 410 open and take out the pressure instrument 20.

[0222] In some examples, the locking structure 600 comprises a first locking piece 610 movably arranged between the pressure block 200 and the shell 420, and the pressure block 200 pushes the first locking piece 610 to move towards the opening and closing space 401 when the pressure block 200 moves towards the opening and closing space 401 along the second piston cavity 310.

[0223] In some examples, the first locking piece 610 can be an annular structure and is sleeved on the outer periphery of the pressure guide block 100.

[0224] In other examples, the first locking piece 610 can be a plate-shaped piece and is arranged on any side of the pressure guide block 100. When the first locking piece 610 is a plate-shaped piece, the first locking piece 610 can be one or more. When the first locking piece 610 is more than one, the plurality of first locking pieces 610 are arranged at intervals around the periphery of the pressure guide block 100 to lock different positions of the shell 420 around the periphery by the locking structure 600, thereby improving the locking effect of the shell 420.

[0225] Hereinafter, the first locking piece 610 is taken as an example of an annular structure.

[0226] As one of the arrangement modes of the first locking piece 610, the first locking piece 610 can be arranged in the base 300 before being subjected to the force of the pressure block 200 towards the opening and closing space 401, and is arranged separately from the pressure block 200. For example, a vertical sliding groove can be arranged on the inner wall of the base 300, and the side wall of the first locking piece 610 extends a protruding portion which can be arranged in the vertical sliding groove, so that when the pressure block 200 pushes the first locking piece 610, the first locking piece 610 can move up and down along the vertical sliding groove.

[0227] As another arrangement mode of the first locking piece 610, the first locking piece 610 is fixedly connected with the pressure block 200 to move synchronously under the driving of the pressure block 200.

[0228] In some examples, the first locking member 610 can be a conical structure, or the sidewall of the first locking member 610 is curved towards the shell 420, such that one end of the first locking member 610 is configured to cooperate with the pressure block 200, and the other end of the first locking member 610 is configured to cooperate with the shell 420, for example, the other end of the first locking member 610 can be used to be clamped with the limiting groove 424 on the inner wall of the shell 420 to limit the up-down movement of the shell 420. For example, during the movement of the pressure block 200 towards the opening-closing space 401, the first locking member 610 can be driven to move upwards, and since the first locking member 610 is an inclined structure, the other end of the first locking member 610 can move upwards along the inner wall of the shell 420, until the pressure block 200 abuts against the pressure guide block 100, and the other end of the first locking member 610 is clamped in the limiting groove 424 of the shell 420 to lock the shell 420 in the locked state, thereby improving the stability of the shell 420 during the high-pressure verification process.

[0229] In some other examples, in order to reduce the interference between the first locking member 610 and other structures in the shell 420, the locking structure 600 can further include a second locking member 620, wherein the second locking member 620 is connected with the first locking member 610, and when the pressure block 200 abuts against the pressure guide block 100, the first locking member 610 drives the second locking member 620 to connect with the shell 420 to lock the shell 420 in the locked state.

[0230] In this example, the first locking member 610 can be a straight cylinder structure and extend along the z direction, and the second locking member 620 is a horizontal rod-shaped member and extends along the x direction, one end of the first locking member 610 cooperates with the pressure block 200, and the other end faces the opening-closing direction, one end of the second locking member 620 cooperates with the first locking member 610, for example, cooperates with the sidewall of the first locking member 610, so that during the movement of the pressure block 200 driving the first locking member 610 to move upwards, the first locking member 610 moves upwards along the z direction and drives the second locking member 620 to move along the x direction towards the limiting groove 424 on the inner wall of the shell 420, until the pressure block 200 abuts against the pressure guide block 100, and the other end of the second locking member 620 is driven by the first locking member 610 to extend into the limiting groove 424 to limit the shell 420 in the z direction.

[0231] By setting the locking structure 600 to include the first locking member 610 and the second locking member 620, the structure of the locking structure 600 and the assembly process in the shell 420 can be simplified, and the interference of the locking structure 600 with other structures in the shell 420 and the base 300 can be reduced.

[0232] Exemplarily, the slot direction of the limiting slot 424 on the shell 420 is perpendicular to the movement direction of the shell 420, so that the second locking member 620 can extend into the limiting slot 424 in the horizontal direction or be separated from the limiting slot 424.

[0233] In some examples, the first elastic member 500 of the pressure connection device 10 can be connected with the first locking member 610. For example, one end of the first elastic member 500 can abut against or be fixedly connected to one end of the first locking member 610 away from the pressure receiving block 200, so as to limit the first elastic member 500. The other end of the first locking member 610 is connected with the pressure receiving block 200. During the movement of the pressure receiving block 200 towards the opening and closing space 401, the first elastic member 500 can be compressed by the first locking member 610, so as to increase the elastic potential energy of the first elastic member 500 during the high-pressure calibration, thereby increasing the force of the pressure receiving block 100 towards the pressure instrument 20.

[0234] In some examples, when the pressure receiving block 200 moves away from the opening and closing space 401, the first elastic member 500 can push the first locking member 610 to move away from the opening and closing space 401, so as to smoothly restore the pressure receiving block 200 to the initial position, so that the pressure connection device 10 can quickly switch from the high-pressure calibration scene to the low-pressure calibration scene, and facilitate the disassembly of the pressure instrument 20 in the low-pressure state.

[0235] In some examples, when the medium pressure is reduced to less than a preset value, the pressure receiving block 200 moves away from the opening and closing space 401, the first locking member 610 moves away from the opening and closing space 401, and the second locking member 620 moves towards the pressure receiving block 100 under the driving of the first locking member 610, so as to be separated from the limiting slot 424 of the shell 420, thereby releasing the shell 420.

[0236] In other examples, the locking structure 600 can further include a second elastic member 630, one end of the second elastic member 630 is connected with the second locking member 620, and the other end of the second elastic member 630 is connected with the shell 420, that is, the second locking member 620 is connected with the shell 420 through the second elastic member 630. When the pressure receiving block 200 moves away from the opening and closing space 401, the second elastic member 630 pushes the second locking member 620 to be separated from the shell 420.

[0237] Exemplarily, the elastic force direction of the second elastic member 630 is perpendicular to the movement direction of the shell 420.

[0238] For example, when the pressure block 200 pushes the first locking member 610 upward, the first locking member 610 can push the second locking member 620 towards the limiting groove 424 of the housing 420 and compress the second elastic member 630, thereby increasing the elastic potential energy of the second elastic member 630. Thus, when the first locking member 610 moves downward, the second locking member 620 can return to its initial state, i.e., disengaged from the housing 420, under the elastic force of the second elastic member 630.

[0239] The second elastic member 630 allows the second locking member 620 to quickly pop out of the limiting groove 424 when it is not pushed in the direction of the limiting groove 424, thereby reducing or preventing the second locking member 620 from remaining in the limiting groove 424 during the movement of the pressure block 200 away from the engagement space 401.

[0240] In some examples, the first locking member 610 and the second locking member 620 can be directly connected or abutted.

[0241] For example, refer to Figure 11 As shown, the first locking member 610 is provided with a guide slope 611. When the pressure block 200 moves along the second piston cavity 310 to the opening and closing space 401, the connection position of the first locking member 610 and the second locking member 620 moves along the guide slope 611 to push the second locking member 620 to move towards the limiting groove 424. When the second locking member 620 is inserted into the limiting groove 424, the housing 420 is locked in the locked state.

[0242] It should be noted that the connection position between the first locking member 610 and the second locking member 620 is the part where the first locking member 610 and the second locking member 620 mate.

[0243] It is understood that the distance between the guide slope 611 and the inner wall of the housing 420 can gradually increase from top to bottom. Thus, when the first locking member 610 moves upward under the pressure of the bearing block 200, the end of the second locking member 620 that cooperates with the first locking member 610 can slide downward along the guide slope 611. The guide slope 611 gradually abuts against the second locking member 620 and moves towards the limiting groove 424 until the bearing block 200 abuts against the pressure block 100. The end of the second locking member 620 away from the guide slope 611 extends into the limiting groove 424 to lock the housing 420 in a locked state.

[0244] In some examples, when one end of the second locking member 620 extends into the limiting groove 424, the end of the second locking member 620 that engages with the first locking member 610 can abut against the guide slope 611.

[0245] In some examples, the first locking member 610 further comprises a top abutting surface 612 and an avoiding surface 613. The avoiding surface 613 is recessed inwardly. The top abutting surface 612 is used to abut the second locking member 620. The top abutting surface 612 is connected to the avoiding surface 613 through a guide slope surface 611. The axial position of the top abutting surface 612 is between the avoiding surface 613 and the pressure block 200. The radial position of the top abutting surface 612 is between the avoiding surface 613 and the limiting groove 424. In other words, the radial distance between the top abutting surface 612 and the limiting groove 424 is smaller than the radial distance between the avoiding surface 613 and the limiting groove 424, and is also smaller than the distance between the guide slope surface 611 and the limiting groove 424.

[0246] Before the first locking member 610 is subjected to the force from the pressure block 200 towards the opening and closing space 401, one end of the second locking member 620 is matched with the avoiding surface 613. When the first locking member 610 is subjected to the force from the pressure block 200 towards the opening and closing space 401, the one end of the second locking member 620 moves from the avoiding surface 613 to the top abutting surface 612 along the guide slope surface 611, so as to be abutted by the top abutting surface 612.

[0247] In some examples, the top abutting surface 612 is a vertical surface. The contact area between the top abutting surface 612 and the one end of the second locking member 620 is larger than the contact area between the guide slope surface 611 and the one end of the second locking member 620, so that the abutment of the top abutting surface 612 to the second locking member 620 is more stable.

[0248] The first locking member 610 and the second locking member 620 are matched through the avoiding surface 613, the guide slope surface 611 and the top abutting surface 612, so that the first locking member 610 moves along the horizontal direction to abut the second locking member 620, which can simplify the connection structure between the first locking member 610 and the second locking member 620. In addition, the avoiding surface 613 is arranged on the side of the guide slope surface 611 away from the pressure block 200, so that the one end of the second locking member 620 is also matched with the first locking member 610 in the initial state, thereby ensuring that when the first locking member 610 moves upwards, the second locking member 620 can smoothly contact the guide slope surface 611 and move to the limiting groove 424 under the abutment of the guide slope surface 611. In other words, the avoiding surface 613 can preliminarily position the first locking member 610 and the second locking member 620, so as to ensure that the second locking member 620 moves along the horizontal direction to the limiting groove 424 smoothly under the abutment of the first locking member 610, which can reduce or avoid the risk that the second locking member 620 cannot finally extend into the limiting groove 424 due to the lagging movement of the second locking member 620 when the first locking member 610 moves upwards.

[0249] In some examples, the second locking member 620 can be one or more. When the second locking member 620 is one, one second locking member 620 can achieve secondary locking of the shell 420. When the second locking member 620 is more than one, the plurality of second locking members 620 can be arranged at intervals around the circumference of the pressure block 100, and the plurality of second locking members 620 can cooperate with a plurality of positions of the shell 420 to achieve secondary locking of the shell 420, thereby improving the locking effect of the shell 420.

[0250] For example, the limiting groove 424 can be more than one, and the plurality of limiting grooves 424 can be arranged at intervals around the inner wall of the shell 420 and correspond to the plurality of second locking members 620 one by one. Each second locking member 620 can extend into the corresponding limiting groove 424 to achieve secondary locking of the shell 420.

[0251] In other examples, the limiting groove 424 can be one, and the limiting groove 424 can be arranged around the inner wall of the shell 420, that is, the limiting groove 424 is formed as an annular groove, and one second locking member 620 or a plurality of second locking members 620 can extend into the annular groove.

[0252] By arranging the limiting groove 424 as an annular groove, the annular groove can always limit one second locking member 620 or a plurality of second locking members 620 when the shell 420 rotates around the pressure block 100.

[0253] The embodiment of the present application utilizes the influence of the medium pressure introduced by the pressure connection device 10. When the medium pressure is large enough (sufficient to push the pressure-bearing block 200 to a position overcoming the elastic potential energy of the second elastic member 630), for example, when the medium pressure is greater than or equal to a preset value, automatic locking can be achieved, thereby preventing external operations (pulling the shell 420 downward) that may cause the locking block 410 to open; on the contrary, when the medium pressure is small enough (the pressure-bearing block 200 is not in contact or under force with the first locking member 610), that is, when the medium pressure is less than the preset value, the locking block 410 can be opened by external operations, thereby removing the pressure instrument 20, and reducing the safety risks caused by instrument indication errors or personnel operation errors.

[0254] Since the shell 420 cannot move up and down relative to the locking block 410, if the locking block 410 is adapted to lock the pressure instrument 20, the pressure instrument 20 cannot be separated from the locking block 410, thereby improving safety.

[0255] In addition, by the area difference between the inner pressure bearing surface (the second pressure bearing surface 222) and the outer pressure bearing surface (the third pressure bearing surface 223) of the pressure bearing block 200, the elastic potential energy of the second elastic member 630 and the elastic potential energy of the first elastic member 500 are matched to provide a screening for the locking pressure for realizing the secondary locking of the shell 420. It can be understood that if a smaller locking pressure is expected, the pre-set elastic potential energy of the second elastic member 630 and the elastic potential energy of the first elastic member 500 can be reduced, and if a larger locking pressure is expected, the pre-set elastic potential energy of the second elastic member 630 and the elastic potential energy of the first elastic member 500 can be increased.

[0256] Exemplarily, the second elastic member 630 can be a spring sleeved on the second locking member 620, or an elastic gasket arranged between the second locking member 620 and the shell 420, and the like, and the embodiments of the present application do not limit the structure of the second elastic member 630.

[0257] In some examples, when the second locking member 620 is assembled, one end of the base 300 can be inserted into the interior of the shell 420, and a locking through hole 710 is formed through the side wall of the one end of the base 300 located in the interior of the shell 420, and the second locking member 620 is movably arranged in the locking through hole 710 to move in the horizontal direction to the limiting groove 424 or to be separated from the limiting groove 424.

[0258] In other examples, in order to simplify the structure of the base 300, an assembly support 700 can be arranged in the shell 420, and the assembly support 700 is limitingly connected or fixedly connected with the base 300; the assembly support 700 is provided with the locking through hole 710, and the extension direction of the locking through hole 710 is perpendicular to the movement direction of the shell 420, and the second locking member 620 is movably arranged in the locking through hole 710.

[0259] Exemplarily, the assembly support 700 used for assembling the locking block 410 in the above can be configured as a support. For example, the locking through hole 710 can be formed on the annular portion of the assembly support 700 to assemble the second locking member 620.

[0260] In other examples, an assembly support 700 can also be additionally arranged to assemble the second locking member 620. For example, the assembly support 700 can be limitingly connected or fixedly connected with the base 300 through an assembly support, or be limitingly connected or fixedly connected with the base 300 directly.

[0261] The second elastic member 630 can be located in the locking through hole 710 and sleeved on the second locking member 620, one end of the second elastic member 630 is abutted or fixedly connected with the second locking member 620, and the other end of the second elastic member 630 is abutted or fixedly connected with the inner wall of the locking through hole 710.

[0262] Exemplarily, the locking hole 710 can include a first small hole section 711, a large hole section 712 and a second small hole section 713 arranged in sequence along the movement direction of the second locking piece 620, the first small hole section 711 is arranged close to the first locking piece 610, the second small hole section 713 is arranged close to the limiting groove 424, and the large hole section 712 is located between the first small hole section 711 and the second small hole section 713, so that the two ends of the large hole section 712 along the extension direction are formed with a first step surface and a second step surface. The first step surface is arranged close to the first small hole section 711, and the second step surface is arranged close to the second small hole section 713.

[0263] In some examples, a stop portion 621 extends on the side wall of the second locking piece 620, and when assembling, the second elastic piece 630 can be sleeved on the second locking piece 620 and located on the side of the stop portion 621 facing the limiting groove 424, and then the second locking piece 620 is sequentially arranged into the second small hole section 713, the large hole section 712 and the first small hole section 711 from the opening of the limiting groove 424 side of the locking hole 710, and when the stop portion 621 is stopped on the first step surface and one end of the second elastic piece 630 abuts on the second step surface, the assembly of the second locking piece 620 and the second elastic piece 630 is completed.

[0264] In some examples, when the first locking piece 610 is independent of the pressure-bearing block 200, that is, the first locking piece 610 is arranged separately from the pressure-bearing block 200, the first locking piece 610 can be arranged on the support surface of the support in the initial state. For example, when the support is the assembly support 700, the support surface facing the opening and closing space 401 can be formed on the side wall of the assembly support 700 facing the pressure guide block 100, and the side wall of the first locking piece 610 extends a protruding portion arranged on the support surface of the assembly support 700.

[0265] Exemplarily, the guide inclined surface 611, the avoiding surface 613 and the abutting surface 612 on the first locking piece 610 can be formed on the end surface of the protruding portion facing the second locking piece 620, so as to simplify the structure of the first locking piece 610.

[0266] In some examples, when it is necessary to install the pressure instrument 20, the operator or other driving structure can pull the shell 420 to move downward, so that the locking block 410 is opened outward, and in the process of extending the pressure instrument 20 into the opening and closing space 401 and connecting with the pressure guide block 100, the operator or other driving structure can continuously exert downward force on the shell 420, so that the shell 420 is always in the first axial position.

[0267] Figure 1 is Figure 12 is a partial enlarged view at C in FIG. 8, Figure 13 is a sectional view of another pressure connection device 10 provided by an embodiment of the present application,Figure 12 yes Figures 11 to 13 A magnified view of a section at point G. (Refer to...) Figure 11 As shown, in some examples, to save manpower or power consumption of other driving structures, the pressure connection device 10 may also include a limiting block 900, which is fixedly connected or limited to the pressure-applying block 100, so that the limiting block 900 can move relative to the locking block 410 to switch between a first limiting position and a second limiting position. For example, the limiting block 900 can move relative to the locking block 410 under the drive of the pressure-applying block 100.

[0268] Among them, reference Figure 7 As shown, when the limiting block 900 is in the first limiting position, the force exerted by the limiting block 900 on the locking block 410 is less than the reverse force exerted by the housing 420 on the locking block 410, so that the opening and closing space 401 is reduced, or the locking block 410 has an inward clamping force; refer to Figure 11 As shown, when the limiting block 900 is in the second limiting position, the force exerted by the limiting block 900 on the locking block 410 is greater than or equal to the reverse force exerted by the housing 420 on the locking block 410, so that the opening and closing space 401 remains unchanged, and when the housing 420 is pulled down to the first axial position, there is no need to continue to apply a downward pulling force to the housing 420, so that the locking block 410 can be guaranteed to be in the unlocked state.

[0269] It should be noted that the limiting block 900 exerts at least an outward force in the horizontal direction on the locking block 410, and the housing 420 exerts at least an inward force in the horizontal direction on the locking block 410 bracket.

[0270] For example, when the locking block 410 is in the locked state, that is, when the pressure instrument 20 is clamped, and the housing 420 is in the second axial position, the limiting block 900 is in the first limiting position, so that the inward force applied by the housing 420 to the locking block 410 is greater than the outward force applied by the limiting block 900 to the locking block 410, that is, to ensure that the resultant force in the horizontal direction on the locking block 410 is directed towards the axial direction of the pressure block 100, and to ensure that the locking block 410 clamps the pressure instrument 20.

[0271] For another example, when the locking block 410 is in the unlocked state, i.e., the locking block 410 is in the open state, and the shell 420 is in the first axial position, the limiting block 900 is in the second limiting position, so that the inward force applied by the shell 420 to the locking block 410 is less than or equal to the outward force applied by the limiting block 900 to the locking block 410, i.e., the horizontal resultant force acting on the locking block 410 is zero or is in the direction away from the axis of the pressure guide block 100, so as to ensure that the size of the opening and closing space 401 does not decrease, thereby ensuring that the pressure instrument 20 can smoothly extend into the opening and closing space 401 and be connected with the first end of the pressure guide block 100. After the pressure instrument 20 is successfully connected with the first end of the pressure guide block 100, the locking block 410 is tightened inwardly to clamp the pressure instrument 20, thereby reducing or avoiding the situation that the pressure instrument 20 is clamped by the locking block 410 during assembly.

[0272] For another example, when the locking block 410 is switched between the locked state and the unlocked state, the limiting block 900 can be switched between the first limiting position and the second limiting position.

[0273] For example, in the natural state, the shell 420 is located at the second axial position, and the limiting block 900 is at the first limiting position. When the pressure instrument 20 needs to be assembled, the shell 420 is pulled down, the locking block 410 is opened to the unlocked state, and the limiting block 900 is moved from the first limiting position to the second limiting position to support the locking block 410 outwardly. Then, the pressure instrument 20 extends into the opening and closing space 401, and the pressure guide block 100 is pressed down. The limiting block 900 can be driven by the pressure guide block 100 to move downwardly from the second limiting position. When the pressure instrument 20 reaches the assembly position and is connected with the pressure guide block 100, the limiting block 900 reaches the first limiting position, the shell 420 moves upwardly and drives the locking block 410 to tighten on the pressure instrument 20.

[0274] When the pressure instrument 20 needs to be disassembled, the shell 420 is pulled down, the locking block 410 is opened outwardly, the pressure instrument 20 is disassembled from one end of the pressure guide block 100, and gradually moves outwardly from the opening and closing space 401. After the pressure guide block 100 is separated from the pressure instrument 20, the pressure guide block 100 can move upwardly under the action of the first elastic member 500. The limiting block 900 can be driven by the pressure guide block 100 to move from the first limiting position to the second limiting position to support the locking block 410 outwardly, so that the pressure instrument 20 can be smoothly taken out from the opening and closing space 401.

[0275] In some examples, during the switching between the first limiting position and the second limiting position, the limiting block 900 can move along the inner wall of the locking block 410 and can be stopped by the inner wall of the locking block 410.

[0276] Referring to Figure 11 As shown, for example, the locking block 410 has a first limiting surface 412 and a second limiting surface 413 on the side facing the pressure block 100, and the second limiting surface 413 is located between the first limiting surface 412 and the base 300;

[0277] The first limiting surface 412 is parallel to the relative movement direction of the locking block 410, and when the limiting block 900 is in the second limiting position, the limiting block 900 is connected with the first limiting surface 412. The second limiting surface 413 is recessed relative to the axis of the pressure block 100, and when the limiting block 900 is in the first limiting position, the limiting block 900 is connected with the second limiting surface 413. When the fixing assembly 400 switches from the locked state to the unlocked state, the limiting block 900 moves from the second limiting surface 413 to the first limiting surface 412.

[0278] For example, the locking block 410 has an extension 411 on the side facing the pressure block 100, and the side of the extension 411 facing the base 300 can be the first limiting surface 412. The first limiting surface 412 is used to limit the limiting block 900 in the axial direction during the movement of the limiting block 900 from the first limiting position to the second limiting position, so as to limit the limiting block 900 in the second limiting position.

[0279] The second limiting surface 413 can be located on the side of the first limiting surface 412 facing the base 300, for example, the second limiting surface 413 is the inner surface of the part of the locking block 410 other than the extension 411.

[0280] It can be understood that the distance between the second limiting surface 413 and the axis of the pressure block 100 is greater than the distance between the first limiting surface 412 and the axis of the pressure block 100.

[0281] When the fixing assembly 400 is in the locked state, the limiting block 900 can abut against the second limiting surface 413 to limit the upward movement of the limiting block 900.

[0282] The first limiting surface 412 and the second limiting surface 413 are provided, on the one hand, to achieve axial and radial limiting of the limiting block 900 in the second limiting position and the first limiting position, and at least to ensure that the locking block 410 has a support force away from the axis of the pressure block 100 in the second limiting position, so as to stabilize the locking block 410 when the fixing assembly 400 is in the unlocked position, and to keep the locking block 410 in the unlocked state, on the other hand, to simplify the cooperation limiting structure between the locking block 410 and the limiting block 900, and to improve the manufacturing and assembly efficiency of the pressure connection device 10.

[0283] In some examples, the second limiting surface 413 is arranged as a vertical surface near at least part of the first limiting surface 412, for example, the first part 413a of the second limiting surface 413, which is connected with the first limiting surface 412. In this way, after the limiting block 900 moves from the second limiting surface 413 to the first limiting surface 412, the outer side wall of the limiting block 900 abuts against the vertical surface of the first part, so as to apply a force on the locking block 410 in the horizontal direction, so as to at least maintain the locking block 410 in the unlocked state.

[0284] In some examples, the second limiting surface 413 is arranged as an arc-shaped surface curved towards the axis direction of the pressure block 100 away from at least part of the first limiting surface 412, for example, the second part 413b, and the limiting block 900 can move along the arc-shaped surface when switching between the first limiting position and the second limiting position.

[0285] The arc-shaped surface guides the smooth switching of the limiting block 900 between the first limiting position and the second limiting position. In addition, the arrangement of the arc-shaped surface also enables the limiting block 900 to abut against one end of the arc-shaped surface facing the base 300 when in the first limiting position, thereby improving the stability of the limiting block 900 in the first limiting position.

[0286] In some other examples, the second part 413b of the second limiting surface 413 can be an inclined surface inclined away from the pressure block 100 from top to bottom, so as to guide the movement of the limiting block 900 between the first limiting position and the second limiting position.

[0287] The first part of the second limiting surface 413 is an axially extending vertical surface. Correspondingly, since the locking block 410 is horizontally opened and closed, no matter how the force is applied by the shell 420, the limiting block 900 abuts against the first limiting surface 412, so that the limiting block 900 is not subjected to a downward force from the locking block 410, and thus can remain in position. As long as the limiting block 900 remains in the current position, the locking block 410 is difficult to close.

[0288] In addition, the second part of the second limiting surface 413 is an inclined surface or an arc-shaped surface. When the pressure instrument 20 is placed in the middle of the locking block 410, as long as the pressure instrument 20 separates the limiting block 900 from the second part 413b of the second limiting surface 413, the second part 413b of the second limiting surface 413 converts the inward closing force into a downward thrust, so as to push the limiting block 900 to move downward until the locking block 410 clamps the pressure instrument 20. At this time, the limiting block 900 reaches the first limiting position.

[0289] Referring to Figure 13As shown, in some examples, in order to ensure that the limiting block 900 is smoothly switched from the first limiting position to the second limiting position, the pressure connection device 10 can further include a fourth elastic member 910, which is arranged between the limiting block 900 and the base 300, and is in a compressed state. When the limiting block 900 moves towards the base 300, the elastic potential energy of the fourth elastic member 910 increases. For example, when the pressure instrument 20 is assembled, the pressure guide block 100 moves towards the base 300 under the action of the pressure instrument 20, and the limiting block 900 can move from the second limiting position to the first limiting position under the action of the pressure guide block 100. During the movement, the fourth elastic member 910 can be continuously compressed, so that the elastic potential energy of the fourth elastic member 910 increases.

[0290] After the pressure instrument 20 is separated from the opening and closing space 401, the operator or other driving structure drives the shell 420 to move to the first axial position, the locking block 410 is horizontally opened outward, and the fourth elastic member 910 can drive the limiting block 900 to move from the first limiting position to the second limiting position, so that the opening and closing space 401 remains unchanged.

[0291] For example, one end of the fourth elastic member 910 can be fixedly connected or abutted on the limiting block 900, and the other end of the fourth elastic member 910 can be fixedly connected or abutted on the assembly support 700 or the base 300.

[0292] In some examples, the limiting block 900 can be fixedly connected to the pressure guide block 100, so as to move synchronously when the pressure guide block 100 moves up and down.

[0293] Referring to Figure 6 As shown, in other examples, the limiting block 900 is limitingly connected with the pressure guide block 100. The side wall of the pressure guide block 100 is provided with a first support table 120 facing away from the opening and closing space 401. When the limiting block 900 is connected with the first support table 120, if the limiting block 900 moves towards the opening and closing space 401, the limiting block 900 drives the pressure guide block 100 to move towards the opening and closing space 401. If the pressure guide block 100 moves towards the base 300, the pressure guide block 100 drives the limiting block 900 to move towards the base 300.

[0294] In some examples, the side wall of the pressure guide block 100 is provided with a second support table 130 facing away from the base 300. When the limiting block 900 is connected with the second support table 130, if the limiting block 900 moves towards the base 300, the limiting block 900 drives the pressure guide block 100 to move towards the base 300. If the pressure guide block 100 moves towards the opening and closing space 401, the pressure guide block 100 drives the limiting block 900 to move towards the opening and closing space 401.

[0295] The guide block 100 is in position-limiting connection with the limiting block 900, at this time, supported by the elastic force of the first elastic member 500, the upper surface of the guide block 100 is lifted to a position higher than the upper surface of the limiting block 900, until the guide block 100 is positioned in the axial direction by the limiting block 900, for example, the second supporting surface of the guide block 100 abuts against the limiting block 900. Since the upper surface of the guide block 100 is higher than the upper surface of the limiting block 900, the connection between the guide block 100 and the pressure instrument 20 can be achieved.

[0296] The lower pull shell 420 is in the position shown in the figure, the locking block 410 is in the open state, the relative position between the locking block 410 and the assembly support 700 in the up-down direction is fixed, the fourth elastic member 910 arranged between the assembly support 700 and the limiting block 900 is in the compressed state, so that the limiting block 900 is upwardly moved under the support force of the fourth elastic member 910, since the inner diameter of the second limiting surface 413 of the locking block 410 is equal to or slightly larger than the outer diameter of the limiting block 900, the limiting block 900 can be lifted into the inner space of the second limiting surface 413, since the inner diameter of the end surface of the extending portion 411 of the locking block 410 is smaller than the outer diameter of the limiting block 900, the limiting block 900 will be blocked by the first limiting surface 412. Figure 4 In some examples, the fourth elastic member 910 is still in the compressed state when the limiting block 900 reaches the first limiting surface 412, so that the limiting block 900 abuts against the first limiting surface 412, at this time, if the downward pulling action of the shell 420 is stopped, due to the support of the limiting block 900 to the locking block 410 in the radial direction, the locking block 410 can always remain in the open state.

[0297] It can be understood that when the locking block 410 is open, the limiting block 900 is lifted to a position (i.e. the second limiting position) at which the locking block 410 can be opened by the elastic force of the fourth elastic member 910, so that when the shell 420 is loosened, the locking block 410 remains in the open state, that is, the position of the limiting block 900 is associated with the opening degree of the locking block 410; relatedly, different pressure instruments 20 can have different depths and outer diameters that can be inserted into the locking block 410.

[0298]

[0299] ​By limiting the block 900 and the pressure block 100 limit connection, for example, the limiting block 900 is in contact with the first support surface 120 provided on the pressure block 100, so that in the process of assembling the pressure instrument 20, the pressure instrument 20 is in contact with the first end of the pressure block 100, and the pressure block 100 is pressed downward, only when the first support surface 120 is in contact with the limiting block 900, the limiting block 900 can be driven downward by the pressure block 100, to weaken the support force of the locking block 410 outward, so that the locking block 410 moves horizontally inward to clamp the pressure instrument 20. Therefore, only need to ensure that the distance between the limiting block 900 and the first support surface 120 in the second limiting position is greater than or equal to the moving distance of the pressure block 100 in the process of assembling the pressure instrument 20, so that the limiting block 900 can at least move downward after the pressure instrument 20 is assembled, thereby ensuring the sealing degree between the pressure instrument 20 and the pressure connecting device 10.

[0300] In some examples, the side wall of the pressure block 100 can only be provided with the first support surface 120 or the second support surface 130.

[0301] In another example, at least part of the limiting block 900 extends between the first support surface 120 and the second support surface 130, for example, the limiting block 900 can extend a protrusion towards one side of the pressure block 100, which extends between the first support surface and the second support surface, so that the limiting block 900 can push the pressure block 100 upward by abutting the first support surface during upward movement; the limiting block 900 can drive the pressure block 100 downward by abutting the second support surface during downward movement.

[0302] It can be understood that when the pressure instrument 20 is separated from the combined space 401, the pressure block 100 can move upward under the action of the fourth elastic member 910 and the first elastic member 500 until the limiting block 900 reaches the second limiting position, which limits the pressure block 100 upward.

[0303] In some examples, the elastic potential energy of the third elastic member 800 is greater than the elastic potential energy of the fourth elastic member 910. For example, the third elastic member 800 and the fourth elastic member 910 are both in a compressed state. When the second part of the second limiting surface 413 is in contact with the limiting block 900, the elastic force of the third elastic member 800 pushes the shell 420 to move upward, and the shell 420 pushes the locking block 410 to move inward; the elastic force of the fourth elastic member 910 pushes the limiting block 900 to move upward, and the limiting block 900 pushes the locking block 410 to move outward. Since the elastic potential energy of the third elastic member 800 is greater than or equal to the elastic potential energy of the fourth elastic member 910, the resultant force acting on the locking block 410 is inward, thereby achieving clamping of the pressure instrument 20.

[0304] In some examples, the elastic potential energy of the first elastic member 500 is greater than or equal to the elastic potential energy of the fourth elastic member 910; for example, the first elastic member 500 and the fourth elastic member 910 are both in a compressed state.

[0305] When the limiting block 900 and the pressure guide block 100 abut in the up-down direction, the elastic potential energy of the first elastic member 500 can be equal to the elastic potential energy of the fourth elastic member 910; thereby causing the pressure gauge 20 to always be subjected to a pre-tightening force of at least the elastic force of the fourth elastic member 910 when the pressure gauge 20 is in contact with the pressure guide block 100. It can be understood that the lower the pressure gauge 20, the greater the elastic potential energy of the first elastic member 500, the greater the elastic force provided by the first elastic member 500, and the greater the pre-tightening force between the pressure gauge 20 and the pressure guide block 100.

[0306] Referring to Figures 4 to 6 As shown in some examples, the first end of the pressure guide block 100 is provided with a sealing member (for example, a third sealing member 140), and the third sealing member 140 surrounds the first through hole 101. When the pressure gauge 20 is connected to the first end of the pressure guide block 100, the pressure gauge 20 abuts against the first sealing member 111 to improve the connection sealing effect between the pressure gauge 20 and the first end of the pressure guide block 100.

[0307] In some examples, the enclosing surface of the sealing member is smaller than the radial cross section of the second piston structure 220.

[0308] For example, an annular groove can be formed on the first end face of the pressure guide block 100, the annular groove is arranged around the first through hole 101, and the sealing member can be a sealing ring, and at least part of the sealing member is embedded in the annular groove.

[0309] It should be noted that the enclosing surface of the sealing member is the structural surface between the outer edge and the inner edge of the sealing member.

[0310] In some examples, the distance between the sealing member and the hole edge of the first through hole 101 is greater than or equal to zero.

[0311] In some examples, when the pressure medium enters the second pressure cavity, the first through hole 101 and the pressure instrument 20 through the third through hole 301, the sealing member is subjected to a downward force of the medium pressure. When the pressure medium reaches the second pressure cavity, the second piston structure 220 is subjected to an upward force of the medium pressure. In the embodiment of the present application, the enclosing surface of the sealing member is arranged to be smaller than the radial section of the second piston structure 220, so that the upward force on the second piston structure 220 is greater than the downward force on the sealing member, thereby ensuring that when the pressure block 200 abuts against the pressure guide block 100, the force of the sealing member on the pressure block 200 through the pressure guide block 100 is less than the upward force of the pressure block 200, so that the pressure block 200 abuts against the pressure guide block 100 and the first sealing member 111 to press the pressure instrument 20, thereby improving the sealing effect between the pressure instrument 20 and the sealing member.

[0312] In some examples, the radial section of the first piston structure 110 is smaller than the radial section of the second piston structure 220.

[0313] When the pressure medium enters the second pressure cavity and the first pressure cavity, the pressure medium in the first pressure cavity exerts an upward force on the first piston structure 110, and the pressure medium in the second pressure cavity exerts an upward force on the second piston structure 220. By arranging the radial section of the first piston structure 110 to be smaller than the radial section of the second piston structure 220, the upward force of the pressure medium on the first piston structure 110 is smaller than the upward force of the pressure medium on the second piston structure 220, so that when the pressure block 200 abuts against the pressure guide block 100, the force on the pressure block 200 and the pressure guide block 100 is directed towards the opening space 401 to abut against the pressure instrument 20, thereby improving the sealing between the pressure guide block 100 and the pressure instrument 20.

[0314] The entire working process of the pressure connection device 10 will be described below in conjunction with the accompanying drawings.

[0315] In the preparation stage, see Figure 6 changes, Figure 6 the changes in this stage end.

[0316] Move the shell 420 downward to the position in Figures 6 to 4 At this time, due to the absence of the restriction of the shell 420, the second matching surface 415 on the locking block 410 abuts against the first matching part 421 of the shell 420, the fourth matching surface 417 abuts against the second matching part 422, and the second matching surface 415 moves parallel to the fourth matching surface 417, so that the locking block 410 moves outward in the radial direction, thereby being opened.

[0317] At almost the same time, the inner diameter of the locking block 410 increases due to the opening of the locking block 410, the limiting block 900 moves upward under the elastic force of the fourth elastic member 910, the upper end surface of the limiting block 900 abuts against the first limiting surface 412, at this time, the outer side surface of the limiting block 900 is supported and connected with the second limiting surface 413 of the locking block 410, the locking block 410 is kept in the open state, and the preparation stage is completed, and the pressure instrument 20 can be put in.

[0318] The installation stage of the dial head of the pressure instrument 20, refer to Figure 1 for changes.

[0319] Put the pressure instrument 20 into the locking block 410, and continuously press the pressure instrument 20 to the position as shown in Figure 1 , the lower end surface of the pressure instrument 20 abuts against the upper end surface of the pressure lead block 100, the pressure lead block 100 moves downward with the pressure instrument 20, the first support surface 120 of the pressure lead block 100 contacts the limiting block 900 and drives the limiting block 900 to move downward, the limiting block 900 is separated from the locking block 410, the locking block 410 returns to the state of being freely opened and tightened, the shell 420 moves upward under the elastic force of the third elastic member 800, and the locking block 410 is clamped with the middle pressure instrument 20 under the force of the shell 420.

[0320] Zero pressure and low pressure (for example, several hundred to several thousand Pa) stage, refer to Figure 9 ,

[0321] Start to press, the pressure enters the pressure connection device 10 from the opening of the third through hole 301 at the lower part of the base 300, at this time, since the pressure is zero or very small, the pressure-bearing block 200 is separated from the first locking member 610, or the pressure-bearing block 200 is connected with the first locking member 610, and the upward force of the pressure-bearing block 200 is equal to or smaller than the elastic force of the first elastic member 500, or the first locking member 610 moves upward, but has not yet moved to the position shown in Figure 2 , at this time, the locking block 410 can still be loosened by pulling down the shell 420, and the pressure instrument 20 can be replaced.

[0322] Higher pressure (several tens of kPa or more) stage, the pressure-bearing block 200 gradually increases the medium pressure, and gradually rises until the first locking member 610 is lifted to the position shown in ​ , at this time, since the abutting surface 612 of the first locking member 610 abuts against the second locking member 620, and the locking member is horizontally pushed into the limiting groove 424 of the shell 420, at this time, if the shell 420 is tried to be moved downward, the shell 420 cannot be moved downward due to the cooperation of the second locking member 620 and the limiting groove 424, and the locking block 410 is kept in the locked state, and the pressure instrument 20 cannot be loosened or replaced.

[0323] After the pressure calibration process is completed, the pressure is reduced, and when the medium pressure is reduced to zero pressure or a small pressure stage, the shell 420 can be pulled down, the locking block 410 is opened, and then the pressure instrument 20 is removed.

[0324] The above detailed description is further detailed for the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above is only a specific implementation of the embodiments of the present application, and is not used to limit the protection scope of the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A pressure connection device for calibrating pressure gauges, characterized in that, The pressure connection device includes: A pressure-sensing block, the first end of which is used to connect to the pressure instrument, the second end of which forms a first piston structure, a first through hole in which the first end of the pressure-sensing block is connected to the first piston structure through the first through hole, and the first end of the pressure-sensing block and the second end of the pressure-sensing block are in opposite directions; A pressure-bearing block, wherein a first piston chamber is formed by an inwardly recessed first end of the pressure-bearing block, and a first piston structure is movably connected to the inner side of the first piston chamber to form a first pressure chamber with variable volume within the first piston chamber; a second piston structure is formed at the second end of the pressure-bearing block; a second through hole is provided in the pressure-bearing block; the first piston chamber is connected to the second piston structure through the second through hole; and the first end of the pressure-bearing block and the second end of the pressure-bearing block are in opposite directions. The base has a first end recessed to form a second piston chamber. The second piston structure is movably connected to the inner side of the second piston chamber to form a second pressure chamber with variable volume in the second piston chamber. The second end of the base is provided with a medium inlet. The base is provided with a third through hole. The medium inlet is connected to the second piston chamber through the third through hole. A fixing component is movably sleeved on the pressure-applying block. One end of the fixing component is connected to the base, and the other end of the fixing component forms an opening and closing space extending out of the first end of the pressure-applying block. The fixing component can switch between an unlocked state and a locked state. When the fixing component is in the unlocked state, the pressure gauge can enter the opening and closing space to connect with the pressure-applying block. When the fixing component is in the locked state, the fixing component is clamped onto the pressure gauge. The pressure medium enters the second pressure chamber through the medium inlet. When the medium pressure in the second pressure chamber is greater than or equal to a preset value, the pressure-bearing block moves along the second piston chamber toward the opening and closing space, and the pressure-bearing block abuts against the pressure-inducing block.

2. The pressure connection device according to claim 1, characterized in that, The first through hole is coaxial with the first piston structure, the second through hole is coaxial with the second piston structure, the first through hole is coaxial with the second through hole, and the third through hole is coaxial with the second piston cavity.

3. The pressure connection device according to claim 1, characterized in that, It also includes the first elastic element; One end of the first elastic element is connected to the pressure-inducing block, and the other end of the first elastic element is connected to the pressure-bearing block. When the pressure instrument is connected to the pressure-inducing block, the first elastic element is in a compressed state to apply an elastic force toward the opening and closing space to the pressure-inducing block. When the pressure-bearing block moves along the second piston chamber toward the opening and closing space, the elastic potential energy of the first elastic element increases. or, One end of the first elastic element is connected to the pressure block, and the other end of the first elastic element is connected to the base; When the pressure gauge is connected to the pressure-applying block, the first elastic element is in a compressed state to apply an elastic force toward the opening and closing space to the pressure-applying block.

4. The pressure connection device according to any one of claims 1-3, characterized in that, The fixing component includes: A locking block, the inner side of which encloses the opening and closing space; The housing is movably fitted onto the outside of the locking block; When the housing is in the first axial position of the locking block, the inner diameter of the locking block is larger than the outer diameter of the pressure gauge, so that the pressure gauge can enter the opening and closing space. When the housing is in the second axial position of the locking block, the inner diameter of the locking block is less than or equal to the outer diameter of the pressure gauge, and the locking block clamps the pressure gauge.

5. The pressure connection device according to claim 4, characterized in that, It also includes a locking structure, which is movably disposed between the pressure block and the housing. When the pressure block moves along the second piston chamber toward the opening and closing space, the pressure block pushes the locking structure to move. When the pressure-bearing block abuts against the pressure-applying block, the locking structure is connected to the housing to lock the housing in the locked state; the locking structure disengages from the housing as the pressure-bearing block moves away from the opening and closing space.

6. The pressure connection device according to claim 5, characterized in that, The locking structure includes: A first locking member is movably disposed between the pressure block and the housing. When the pressure block moves along the second piston chamber toward the opening and closing space, the pressure block pushes the first locking member toward the opening and closing space. The second locking member is connected to the first locking member. When the pressure block abuts against the pressure-applying block, the first locking member pushes the second locking member to connect with the housing, so as to lock the housing in the locked state. The first elastic element of the pressure connection device is connected to the first locking element, and the other end of the first locking element is connected to the pressure block. When the pressure block moves away from the opening and closing space, the first elastic element pushes the first locking element to move away from the opening and closing space.

7. The pressure connection device according to claim 6, characterized in that, The locking structure further includes a second elastic element, one end of which is connected to the second locking element, and the other end of which is connected to the housing. When the pressure block moves away from the opening and closing space, the second elastic element pushes the second locking element to disengage from the housing.

8. The pressure connection device according to claim 6, characterized in that, The housing is provided with a limiting groove, and the opening direction of the limiting groove is perpendicular to the movement direction of the housing; The first locking member is provided with a guide slope. When the pressure block moves along the second piston cavity to the opening and closing space, the connection position of the first locking member and the second locking member moves along the guide slope to push the second locking member to move towards the limiting groove. When the second locking member is inserted into the limiting groove, the housing is locked in the locked state.

9. The pressure connection device according to claim 8, characterized in that, The first locking member is provided with a resisting surface and a relief surface. The relief surface has an inwardly recessed structure. The resisting surface is used to resist the second locking member. The resisting surface is connected to the relief surface through the guide inclined surface. The axial position of the resisting surface is located between the relief surface and the pressure block. The radial position of the resisting surface is located between the relief surface and the limiting groove. Before the first locking member is subjected to the force of the pressure block toward the opening and closing space, one end of the second locking member engages with the clearance surface; when the first locking member is subjected to the force of the pressure block toward the opening and closing space, one end of the second locking member moves from the clearance surface to the abutting surface to be abutted by the abutting surface.

10. The pressure connection device according to claim 8, characterized in that, The first locking member is positioned within the base before being subjected to a force from the pressure block toward the opening / closing space, and is separately disposed from the pressure block; or, The first locking member is fixedly connected to the pressure-bearing block.

11. The pressure connection device according to claim 8, characterized in that, The housing is further provided with a component bracket, which is limited or fixedly connected to the base; the component bracket is provided with a locking through hole, the extension direction of which is perpendicular to the movement direction of the housing, and the second locking member is movably inserted into the locking through hole.

12. The pressure connection device according to claim 4, characterized in that, Also includes: The third elastic element is disposed between the housing and the base. When the housing moves toward the base, the third elastic element is in a compressed state and the elastic potential energy of the third elastic element increases. The inner wall of the housing is provided with an inwardly protruding first mating part. The locking block is provided with a first mating surface and a second mating surface that mate with the first mating part on the side opposite to the pressure block. The second mating surface is located between the first mating surface and the base in the axial direction, and the second mating surface is inclined towards the pressure block. When the housing is located in the second axial position of the locking block, the first mating part abuts against the first mating surface so that the locking block clamps the pressure gauge. When the housing switches from the locked state to the unlocked state, the first mating part slides along the second mating surface.

13. The pressure connection device according to claim 12, characterized in that, The inner wall of the housing is provided with an inwardly protruding second mating part. The second mating part and the first mating part are spaced apart along the axial direction of the housing. Correspondingly, the locking block is provided with a third mating surface and a fourth mating surface on the side opposite to the pressure block, which mate with the second mating part. The fourth mating surface is located between the third mating surface and the base in the axial direction. The first mating surface is parallel to the third mating surface, and the second mating surface is parallel to the fourth mating surface. When the housing is located in the second axial position of the locking block, the second mating part abuts against the third mating surface so that the locking block clamps the pressure gauge. When the housing switches from the locked state to the unlocked state, the second mating part slides along the fourth mating surface.

14. The pressure connection device according to claim 4, characterized in that, It also includes a limiting block, which is fixedly connected or limited to the pressure block, so that the limiting block can move relative to the locking block to switch between a first limiting position and a second limiting position; When the limiting block is located at the first limiting position, the force exerted by the limiting block on the locking block is less than the reverse force exerted by the housing on the locking block, so as to reduce the opening and closing space, or the locking block has an inward clamping force. When the limiting block is in the second limiting position, the force exerted by the limiting block on the locking block is greater than or equal to the reverse force exerted by the housing on the locking block, so as to keep the opening and closing space unchanged.

15. The pressure connection device according to claim 14, characterized in that, The locking block has a first limiting surface and a second limiting surface on the side facing the pressure block. The axial position of the second limiting surface is located between the first limiting surface and the base, and the radial position of the first limiting surface is located between the axis of the pressure block and the second limiting surface. Wherein, the first limiting surface is perpendicular to the relative movement direction of the locking block. When the limiting block is in the second limiting position, the limiting block is connected to the first limiting surface. When the limiting block is in the first limiting position, the limiting block is connected to the second limiting surface. When the fixing component switches from the locked state to the unlocked state, the limiting block moves from the second limiting surface to the first limiting surface.

16. The pressure connection device according to claim 15, characterized in that, At least a portion of the second limiting surface away from the first limiting surface is an arc-shaped surface that bends toward the axis of the pressure block. When the limiting block switches between the first limiting position and the second limiting position, it moves along the arc-shaped surface.

17. The pressure connection device according to claim 14, characterized in that, It also includes a fourth elastic element, which is disposed between the limiting block and the base. The fourth elastic element is in a compressed state. When the limiting block moves toward the base, the elastic potential energy of the fourth elastic element increases. After the pressure gauge disengages from the opening and closing space, it drives the housing to move to the first axial position, and the fourth elastic element drives the limiting block to move to the second limiting position, so that the opening and closing space remains unchanged.

18. The pressure connection device according to claim 14, characterized in that, The limiting block is limited to the pressure block; The pressure block has a first support platform facing the base on its side wall. When the limiting block is connected to the first support platform, if the limiting block moves away from the base, the limiting block will cause the pressure block to move away from the base. If the pressure block moves towards the base, the pressure block will cause the limiting block to move towards the base. The pressure block has a second support platform facing away from the base on its side wall. When the limiting block is connected to the second support platform, if the limiting block moves toward the base, the limiting block will cause the pressure block to move toward the base. If the pressure block moves away from the base, the pressure block will cause the limiting block to move away from the base.

19. The pressure connection device according to claim 4, characterized in that, The fixing component also includes a component bracket, the locking block is mounted on the component bracket, the component bracket is at least partially disposed inside the housing, the end of the housing that is used to cooperate with the base is bent inward to a limiting protrusion, the inner circumference of the limiting protrusion is larger than the outer circumference of the component bracket, a limiting snap ring is provided between the limiting protrusion and the component bracket, the inner circumference of the limiting snap ring is smaller than the outer circumference of the component bracket.

20. The pressure connection device according to any one of claims 1-3, characterized in that, The first end of the pressure block is provided with a sealing element, which surrounds the first through hole. The enclosing surface of the sealing element is smaller than the radial cross-section of the second piston structure. The radial cross-section of the first piston structure is smaller than the radial cross-section of the second piston structure.

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