Pressure verification device

Abstract

The embodiment of the utility model provides a pressure verification device, and the device comprises a device main body which extends to form a first hand-held part, the first hand-held part is constructed to be in a shape which is convenient to hold, and the device main body is provided with a supporting surface; the piston cylinder comprises a cylinder body and a piston, a cavity which is variable in volume and provided with an input end and an output end is formed between the piston and the cylinder body, the pressure transmitting medium is sucked from the input end of the cavity when the volume of the cavity is increased, the pressure transmitting medium is discharged from the output end of the cavity when the volume of the cavity is decreased, and one of the cylinder body and the piston is arranged on the device body; the operation structure is located on the side, back to the supporting face, of the device body, the other one of the cylinder body and the piston is connected with the operation structure, the operation structure extends to form a second handheld part, and the second handheld part corresponds to the first handheld part; the instrument interface is used for providing a pressure transmitting medium for a pressure instrument, and the instrument interface is communicated with the output end of the cavity.

Description

Technical Field

[0001] This application belongs to the technical field of pressure calibration, and particularly relates to a pressure calibration device. Background Art

[0002] The pressure calibration device is used to calibrate pressure instruments and includes a manually driven piston cylinder structure. During the calibration process, the output end of the piston cylinder is connected to the pressure instrument to output the medium pressure required for calibration to the pressure instrument.

[0003] In a related technology, as Figure 1 shown, the pressure calibration device includes a device main body 11 and a handle 12. During the calibration process, the support surface of the device main body is supported on a workbench 13, and the piston cylinder structure is driven by pressing the handle towards the workbench. This related technology requires a workbench to be provided on-site for support and is difficult to use in industrial sites lacking placement space.

[0004] In another related technology, as Figure 2 shown, the pressure calibration device includes two handles 12 that can be held with one hand. During the calibration process, the piston cylinder structure is driven by controlling the gripping of the handles through the opening and closing of the palm. The medium pressure that can be provided by this related technology is usually less than that of the previous related technology. During the opening and closing of the palm, the pressure calibration device is prone to shaking and other situations, affecting the accuracy of the calibration pressure.

[0005] In order to meet different calibration requirements, it is necessary to configure the above two types of pressure calibration devices at the same time. However, due to different design purposes of the above two pressure calibration devices in terms of pressure stability and working environment, only one of the pressure calibration devices can be used for calibration operations at the same time according to the actual on-site environment, reducing the operation efficiency of pressure calibration. Utility Model Content

[0006] The embodiments of this application provide a pressure calibration device that can meet two different calibration requirements and improve the operation efficiency of pressure calibration.

[0007] The embodiments of this application provide a pressure calibration device, including:

[0008] A device main body, the device main body extends to form a first handheld part, the first handheld part is configured in a shape that is convenient for gripping, and a support surface is provided on the device main body;

[0009] A piston cylinder, the piston cylinder includes a cylinder body and a piston, a cavity with a variable volume and having an input end and an output end is formed between the piston and the cylinder body, so as to inhale a pressure transmission medium from the input end of the cavity when the volume of the cavity increases, and discharge the pressure transmission medium from the output end of the cavity when the volume of the cavity decreases, and one of the cylinder body and the piston is arranged on the device main body;

[0010] An operating structure is located on the side of the device body facing away from the supporting surface. The other one of the cylinder body and the piston is connected to the operating structure. The operating structure extends to form a second hand-held part, and the second hand-held part corresponds to the first hand-held part.

[0011] An instrument interface is used to provide a pressure transmission medium to a pressure gauge, and the instrument interface is connected to the output end of the cavity.

[0012] The embodiment of the present application provides a pressure calibration device. A supporting surface is provided on the device body, a first hand-held part corresponding to the second hand-held part is formed on the device body, and an operating structure is provided on the side of the device body facing away from the supporting surface. One of the cylinder body and the piston is provided on the device body, and the other one of the cylinder body and the piston is connected to the operating structure. In this way, in one working mode, during the pressure calibration process, the supporting surface can be connected to the workbench so that the pressure calibration device is supported on the workbench. By holding the second hand-held part on the operating structure and pressing down or lifting the operating structure, the operating structure drives the piston and the cylinder body to move relative to each other, so that the piston cylinder provides a pressure transmission medium to the pressure gauge through the instrument interface, thereby calibrating the pressure gauge. In another working mode, during the pressure calibration process, one hand can hold the first hand-held part and the other hand can hold the second hand-held part. In a state of being separated from the workbench, the piston and the cylinder body can move relative to each other under the drive of both hands, thereby generating and outputting a pressure transmission medium, and then calibrating the pressure gauge. In this way, the pressure calibration device of the embodiment of the present application can work on the workbench or be separated from the workbench and work in a state of being held by both hands, so as to adapt to the calibration requirements in different on-site environments, improve the use efficiency of the pressure calibration device, and further improve the work efficiency of the entire pressure calibration process.

[0013] In some implementation manners, a first concave area is provided on the first hand-held part, and the structure of the first concave area is adapted to the fingers to limit the fingers during holding.

[0014] In some implementation manners of the embodiment of the present application, through the setting of the first concave area, the load-bearing effect when holding the first hand-held part can be improved, so that one hand holds the first hand-held part for load-bearing and support, and the other hand holds the second hand-held part to control the piston cylinder, thereby improving the operation experience when holding the pressure calibration device with both hands.

[0015] In some implementation manners, at least two first concave areas are arranged at intervals on the first hand-held part;

[0016] The distance between two adjacent first concave areas is less than or equal to 1 cm; or, a friction area is provided between two adjacent first concave areas, and the surface friction coefficient of the friction area is greater than the surface friction coefficient of the first concave area.

[0017] In some implementation manners of the embodiments of the present application, through the setting of at least two first recessed areas, cooperation with at least two fingers can be achieved to improve the holding effect of the first holding part; in some implementation manners of the embodiments of the present application, the cooperative setting of the friction area and the first recessed area enables the holding structure of the first holding part to be applicable to palms of different widths, or can be applicable to different holding manners, thereby improving the holding effect of the first holding part.

[0018] In some implementation manners, at least part of the first recessed area is arranged on the side of the first holding part facing the second holding part, so that the first holding part and the second holding part are configured to be held relatively with both hands.

[0019] In some implementation manners of the embodiments of the present application, at least part of the first recessed area is arranged on the side of the first holding part facing the second holding part, so that, in the state of holding with both hands, the positions of the fingers holding the first holding part fall into the first recessed area and are thus limited by the first recessed area.

[0020] In some implementation manners, the second holding part is provided with a pressing surface adapted to the palm at a position facing away from the first holding part to press the second holding part towards the first holding part, so as to reduce the relative distance between the first holding part and the second holding part;

[0021] and / or,

[0022] The second holding part is provided with a second recessed area adapted to the fingers at a position facing the first holding part to pull the second holding part away from the first holding part, so as to increase the relative distance between the first holding part and the second holding part.

[0023] In some implementation manners of the embodiments of the present application, through the setting of the pressing surface, when the palm presses on the pressing surface, the pressing operation experience between the first holding part and the second holding part can be improved; in some implementation manners of the embodiments of the present application, through the setting of the second recessed area, the pulling and separating operation experience between the first holding part and the second holding part can be improved; in some implementation manners of the embodiments of the present application, through the setting of the pressing surface and the second recessed area, the piston cylinder can be controlled by operating the second holding part, thereby improving the operation experience when holding the double-hand holding pressure calibration device. In some implementation manners, the projection of the first holding part on the plane where the supporting surface is located and the projection of the second holding part on the plane where the supporting surface is located at least partially overlap.

[0024] In some implementation manners of the embodiments of the present application, through the position setting of the first holding part and the second holding part, it is convenient to hold the first holding part and the second holding part with both hands respectively.

[0025] In some implementation manners, the device main body extends to form a supporting structure, and the supporting surface is arranged on the supporting structure.

[0026] When the supporting surface is connected to the workbench, there is a gap between the first hand-held part and the workbench.

[0027] In some implementation manners of the embodiments of the present application, through the setting of the supporting structure, the part of the device main body forming the first hand-held part and the supporting surface are respectively realized by different structures, reducing the friction risk between the first hand-held part and the workbench. In some implementation manners, the supporting structure includes a first supporting connecting piece;

[0028] The supporting surface is arranged on the first supporting connecting piece, and an acute angle is formed between the central axis of the first supporting connecting piece and the supporting surface; alternatively, the supporting structure further includes a second supporting connecting piece, the supporting surface is arranged on the second supporting connecting piece, the second supporting connecting piece is connected to the first supporting connecting piece, and an obtuse angle is formed between the first supporting connecting piece and the second supporting connecting piece.

[0029] In some implementation manners of the embodiments of the present application, the angle between the first supporting connecting piece and the supporting surface is designed such that when the torque applied to the device main body passes through the first supporting connecting piece, it will be distributed according to the angle, improving the stability of the pressure calibration device on the workbench.

[0030] In some implementation manners, the supporting structure includes a first supporting connecting piece and a second supporting connecting piece;

[0031] The first supporting connecting piece is rotatably and lockably connected to the second supporting connecting piece to adjust the angle between the first supporting connecting piece and the second supporting connecting piece; and / or,

[0032] The first supporting connecting piece is telescopically and lockably connected to the second supporting connecting piece to adjust the total length of the first supporting connecting piece and the second supporting connecting piece.

[0033] In some implementation manners of the embodiments of the present application, through the lockable movable connection structure between the first supporting connecting piece and the second supporting connecting piece, when the supportable area is an arc surface or other non-horizontal plane, the angle or the length of the supporting structure can be adjusted as needed to improve the stability of the pressure calibration device. In some implementation manners, it further includes:

[0034] An instrument connecting part for detachably fixing a first pressure instrument, and the instrument connecting part is rotatably connected to the device main body:

[0035] The instrument interface includes a first pressure interface arranged on the instrument connecting part.

[0036] In some implementation manners of the embodiments of the present application, the instrument connection part is rotatably connected to the device main body. When the pressure calibration device is placed on a workbench or held by both hands, the first pressure instrument is fixedly connected to the instrument connection part. The angle between the instrument connection part and the device main body can be adjusted according to the specific use posture, and then the display angle of the first pressure instrument can be adjusted, so that the display angle of the first pressure instrument is adapted to the use posture of the pressure calibration device, improving the working efficiency of pressure calibration.

[0037] In some implementation manners, the device main body and the instrument connection part are unlockably locked in a first relative position, so that the first pressure interface and the support surface are on both sides of the device main body, and a first included angle is formed between the central axis of the first pressure interface and the plane where the support surface is located, and the first included angle is greater than or equal to 45°; or,

[0038] The device main body and the instrument connection part are unlockably locked in a second relative position, so that a second included angle is formed between the central axis of the first pressure interface and the central axis of the first handheld part, and the second included angle is less than or equal to 30°.

[0039] In some implementation manners of the embodiments of the present application, when the pressure calibration device is placed on a workbench, the device main body and the instrument connection part are unlockably locked in the first relative position, which can make the display angle of the first pressure instrument fixed on the instrument connection part correspond to the sight line angle of the staff. When the pressure calibration device is held by both hands, the device main body and the instrument connection part are unlockably locked in the second relative position, which can make the display angle of the first pressure instrument fixed on the instrument connection part correspond to the sight line angle of the staff.

[0040] In some implementation manners, it further includes:

[0041] A rotating shaft, on which a first pressure guiding port is provided;

[0042] A rotating hole, the inner diameter of the rotating hole is adapted to the outer diameter of the rotating shaft, so that the rotating shaft can rotate coaxially relative to the rotating hole. A second pressure guiding port is provided in the rotating hole, and the first pressure guiding port is communicated with the second pressure guiding port through the rotating hole;

[0043] A rotating seal, arranged between the outer wall of the rotating shaft and the inner wall of the rotating hole;

[0044] The rotating shaft is arranged on the instrument connection part, the first pressure guiding port is communicated with the first pressure interface, the rotating hole is arranged on the device main body, and the second pressure guiding port is communicated with the output end of the cavity; or, the rotating shaft is arranged on the device main body, the first pressure guiding port is communicated with the output end of the cavity, the rotating hole is arranged on the instrument connection part, and the second pressure guiding port is communicated with the first pressure interface.

[0045] In some implementation manners of the embodiments of the present application, a part of the communication relationship can be arranged on the rotating shaft, and the other part of the communication relationship can be arranged on the rotating hole, so that the communication relationship can be realized through a rotating connection structure. The rotating seal is correspondingly arranged with the rotating connection structure, so that during rotation, the communication relationship can be realized and the seal between the communication relationship and the outside can be realized, thereby improving the reliability and stability of the transmission of the pressure transmission medium.

[0046] In some implementation manners, a pressure regulating cavity with a variable volume is formed inside the first hand-held part, and the pressure regulating cavity is communicated with the output end of the cavity to regulate the pressure of the pressure transmission medium output from the piston cylinder.

[0047] In some implementation manners of the embodiments of the present application, arranging a pressure regulating cavity with a variable volume inside the first hand-held part improves the utilization efficiency of the structure in space. Compared with arranging the pressure regulating cavity at the position between the first hand-held part and the first pressure interface, the structural length between the first hand-held part and the instrument connection part can be reduced, and the stability of the pressure calibration device when held with both hands is improved.

[0048] In some implementation manners, it further includes:

[0049] A pressure regulating piston movably arranged in the pressure regulating cavity to adjust the volume of the pressure regulating cavity;

[0050] A pressure regulating rod for driving the pressure regulating piston. One end of the pressure regulating rod is connected to the pressure regulating piston, and the other end of the pressure regulating rod extends out of the first hand-held part to facilitate manual control of the pressure regulating rod.

[0051] In some implementation manners of the embodiments of the present application, through the arrangement of the pressure regulating piston and the pressure regulating rod, the utilization efficiency of the structure in space is further improved. Compared with arranging the pressure regulating rod at the position between the first hand-held part and the first pressure interface, the structural length between the first hand-held part and the instrument connection part can be reduced, and the stability of the pressure calibration device when held with both hands is improved.

[0052] In some implementation manners, the device main body further includes a liquid storage cavity. The input end of the cavity is communicated with the liquid storage cavity to supply a liquid pressure transmission medium to the piston cylinder through the liquid storage cavity. The liquid storage cavity is arranged between the piston cylinder and the instrument interface, so that when holding the first hand-held part and the second hand-held part with both hands, the position of the liquid storage cavity is higher than the position of the piston cylinder.

[0053] In some implementation manners of the embodiments of the present application, through the design of the position of the liquid storage cavity, in the usage posture of holding with both hands, since the position of the liquid storage cavity is higher than the position of the piston cylinder, the liquid medium will flow to the input end of the piston cylinder due to gravity, thereby squeezing the air out of the output end of the piston cylinder, reducing the possibility of the piston cylinder sucking in air, and further enabling the liquid medium to quickly fill the pipeline between the piston cylinder and the instrument interface, improving the pressure calibration efficiency.

[0054] In some implementations, an exhaust circuit is provided inside the device body. One end of the exhaust circuit is communicated with the liquid storage cavity, and the other end of the exhaust circuit is communicated with the output end of the cavity. The first stop valve is arranged on the exhaust circuit to control the on-off of the exhaust circuit.

[0055] In some implementations of the embodiments of the present application, through the arrangement of the exhaust circuit and in combination with the position design of the liquid storage cavity, if there is air in the pipeline between the piston cylinder and the instrument interface, it can be mixed with the liquid medium and enter the liquid storage cavity when the exhaust circuit is opened, and gas-liquid separation is achieved based on gravity in the liquid storage cavity, thereby reducing the air in the pipeline between the piston cylinder and the instrument interface and improving the pressure calibration efficiency.

[0056] In some implementations, a pressure relief port communicating with the instrument interface is provided on the device body, and a second stop valve is arranged on the pressure relief port to control the opening and closing of the pressure relief port;

[0057] And / or, the instrument interface further includes a second pressure interface, which is arranged on the device body and is used to be connected to a second pressure instrument through an external pipeline.

[0058] In some implementations of the embodiments of the present application, by providing a pressure relief port, the medium pressure at the instrument interface can be relieved when needed, and by providing a second pressure interface, the medium pressure can be provided to the second pressure instrument, so that a comparison is formed between the first pressure instrument and the second pressure instrument based on the same medium pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0060] Figure 1 is a schematic structural diagram of a pressure calibration device in the prior art;

[0061] Figure 2 is a schematic structural diagram of another pressure calibration device in the prior art;

[0062] Figure 3 is a schematic structural diagram of one of the pressure calibration devices provided by an embodiment of the present application;

[0063] Figure 4 is a front view of one of the pressure calibration devices provided by an embodiment of the present application;

[0064] Figure 5 It is a schematic connection diagram of a piston cylinder and an operating structure provided by an embodiment of the present application;

[0065] Figure 6 It is a schematic structural diagram of another pressure calibration device provided by an embodiment of the present application;

[0066] Figure 7 It is a pipeline connection diagram of one of the pressure calibration devices provided by an embodiment of the present application;

[0067] Figure 8 It is a pipeline connection diagram of another pressure calibration device provided by an embodiment of the present application;

[0068] Figure 9 It is a state diagram of the pressure calibration device in the first working mode provided by an embodiment of the present application;

[0069] Figure 10 It is a state diagram of the pressure calibration device in the second working mode provided by an embodiment of the present application;

[0070] Figure 11 It is Figure 4 A cross-sectional view along X-X at position A in

[0071] Figure 12 It is Figure 4 A cross-sectional view along the Y-Y direction at position A in

[0072] Figure 13 It is Figure 4 A cross-sectional view along the Y-Y direction at position B in

[0073] Figure 14 It is a schematic structural diagram of the commutation part in the first conduction state in one of the pressure calibration devices provided by an embodiment of the present application;

[0074] Figure 15 It is a schematic structural diagram of the commutation part in the second conduction state in one of the pressure calibration devices provided by an embodiment of the present application;

[0075] Figure 16 It is a schematic structural diagram of the liquid storage cavity in another pressure calibration device provided by an embodiment of the present application.

[0076] Description of reference numerals:

[0077] 10 - First pressure gauge;

[0078] 100 - Device main body; 200 - Piston cylinder; 300 - Operating structure; 400 - Instrument interface; 500 - Pressure regulating cavity; 600 - Pressure regulating piston; 700 - Pressure regulating rod; 800 - Instrument connection part;

[0079] 110 - First hand-held part; 120 - Support structure; 130 - Liquid storage chamber; 140 - Reversing part; 150 - Second pipeline; 160 - Third pipeline; 170 - Fourth pipeline; 180 - Fifth pipeline; 100a - First stop valve; 100b - Second stop valve; 100c - Third stop valve; 100d - Pressure plug; 210 - Cylinder block; 220 - Piston; 230 - Chamber; 240 - Input end; 250 - Output end; 241 - First check valve; 242 - Second check valve; 310 - Second hand-held part; 320 - Operating rod; 330 - Connecting part; 320a - First fulcrum; 320b - Second fulcrum; 410, First pressure interface; 420 - Second pressure interface; 710 - Pressure regulating handle; 810 - First pipeline; 820 - Rotating shaft; 830 - Rotating hole; 840 - Rotating seal

[0080] 111 - First recessed area; 112 - Friction area; 120a - Support surface; 121 - First support connecting piece; 122 - Second support connecting piece; 131 - Liquid outlet; 132 - Liquid inlet; 133 - Drain port; 134 - Liquid inlet port; 135 - Liquid inlet valve; 136 - Drain valve; 141 - Reversing chamber; 142 - Reversing block; 141a - Medium input port; 141b - First connection port; 141c - Second connection port; 141d - Third connection port; 142a - First reversing port; 142b - Second reversing port; 142c - Third reversing port; 142d - Fourth reversing port; 142e - Fifth reversing port; 142f - Sixth reversing port; 150a - First pressure guiding port; 150b - Second pressure guiding port; 311 - Pressing surface; 312 - Second recessed area. Detailed implementation manners

[0081] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0082] It should be noted that many specific details are set forth in the following description to facilitate a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the protection scope of this application is not limited by the specific implementation manners disclosed below.

[0083] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "horizontal", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In the present application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium.

[0084] In the present application, unless otherwise clearly specified and limited, terms such as "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. However, indicating a direct connection means that there is no connection relationship constructed through an excessive structure between the two connected main bodies, and they are only connected through the connection structure to form a whole. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0085] In the present application, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one such feature. Figure 3 is a schematic structural diagram of one of the pressure calibration devices provided by an embodiment of the present application; Figure 4 is a front view of one of the pressure calibration devices provided by an embodiment of the present application; Figure 5 is a schematic connection diagram of a piston cylinder and an operating structure provided by an embodiment of the present application; Figure 6 is a schematic structural diagram of another pressure calibration device provided by an embodiment of the present application. Refer to Figures 3 to 6 As shown, an embodiment of the present application provides a pressure calibration device, including a piston cylinder 200 and an instrument interface 400. The piston cylinder 200 is used to provide a pressure-bearing pressure transmission medium. The instrument interface 400 is used to communicate with a pressure gauge to provide the pressure transmission medium to the pressure gauge.

[0086] Specifically, the instrument interface 400 communicates with the output end of the piston cylinder 200 to provide a pressure-bearing pressure transmission medium to the instrument interface 400 through the piston cylinder 200, and then provide the pressure-bearing pressure transmission medium to the pressure gauge through the instrument interface 400.

[0087] Refer to Figure 5As shown, in some examples, the piston cylinder 200 includes a cylinder block 210 and a piston 220. A chamber 230 with a variable volume, having an input end 240 and an output end 250, is formed between the piston 220 and the cylinder block 210. When the volume of the chamber 230 increases, a pressure transmission medium is inhaled from the input end 240 of the chamber 230, and when the volume of the chamber 230 decreases, the pressure transmission medium is discharged from the output end 250 of the chamber 230.

[0088] There is a sliding and sealing connection between the inner side of the cylinder block 210 and the piston 220. The chamber 230 is enclosed by the side wall and the bottom wall of the cylinder block 210 and the piston surface of the piston 220. When the piston 220 reciprocates inside the cylinder block 210, the volume of the chamber 230 changes. Further, when the piston 220 moves towards the bottom wall of the cylinder block 210, the volume of the chamber 230 decreases, and when the piston 220 moves away from the bottom wall of the cylinder block 210, the volume of the chamber 230 increases.

[0089] In some examples, a first one-way valve 241 can be provided between the chamber 230 and the input end 240. The inlet of the first one-way valve 241 is communicated with the input end 240, and the outlet of the first one-way valve 241 is communicated with the chamber 230. If the pressure at the inlet of the first one-way valve 241 is greater than the pressure at the outlet of the first one-way valve 241, the first one-way valve 241 is in a conducting state, enabling the pressure transmission medium to enter the chamber 230 through the first one-way valve 241. If the pressure at the inlet of the first one-way valve 241 is less than the pressure at the outlet of the first one-way valve 241, the first one-way valve 241 is in a cut-off state, preventing the pressure transmission medium from passing through the first one-way valve 241. In some examples, a second one-way valve 242 can be provided between the chamber 230 and the output end 250. The inlet of the second one-way valve 242 is communicated with the chamber 230, and the outlet of the second one-way valve 242 is communicated with the output end 250. If the pressure at the inlet of the second one-way valve 242 is greater than the pressure at the outlet of the second one-way valve 242, the second one-way valve 242 is in a conducting state, enabling the pressure transmission medium to pass through the second one-way valve 242 and then be output from the output end 250. If the pressure at the inlet of the second one-way valve 242 is less than the pressure at the outlet of the second one-way valve 242, the second one-way valve 242 is in a cut-off state, preventing the pressure transmission medium from passing through the second one-way valve 242.

[0090] In this way, when the piston 220 moves relative to the cylinder block 210, causing the volume of the chamber 230 to increase, the first one-way valve 241 is in the conducting state, and the second one-way valve 242 is in the cut-off state. The pressure transmission medium can enter the chamber 230 through the first one-way valve 241, and will not suck in the pressure transmission medium at the instrument interface 400 through the output end 250. When the piston 220 moves relative to the cylinder block 210, causing the volume of the chamber 230 to decrease, the first one-way valve 241 is in the cut-off state, and the second one-way valve 242 is in the conducting state. The pressure transmission medium can be discharged to the instrument interface 400 through the second one-way valve 242 and the output end 250, and will not be discharged from the first one-way valve 241 and the input end 240. The pressure transmission medium flows unidirectionally from the input end 240 to the output end 250 and will not flow reversely due to the reciprocating motion of the piston 220.

[0091] It can be understood that the embodiment of the present application provides an exemplary piston cylinder structure. In some examples, the piston cylinder 200 can be composed of two or more groups of pistons and cylinder blocks; the input end of the chamber surrounded by a group of pistons and cylinder blocks can be used as the input end of the entire piston cylinder 200, and the output end of the chamber surrounded by this group of pistons and cylinder blocks is communicated with the input end of the chamber surrounded by the next group of pistons and cylinder blocks; the output end of the chamber surrounded by another group of pistons and cylinder blocks can be used as the output end of the entire piston cylinder 200, and the input end of the chamber surrounded by this group of pistons and cylinder blocks is communicated with the output end of the chamber surrounded by the previous group of pistons and cylinder blocks; the cooperation of two or more groups of pistons and cylinder blocks can enable the pressure transmission medium to obtain two-stage or more-stage pressurization when flowing through the piston cylinder 200. Figure 7 It is the pipeline connection diagram of one of the pressure calibration devices provided by an embodiment of the present application. Refer to Figure 3 、 Figure 5 and Figure 7 As shown, in some examples, the pressure transmission medium can be a gas medium, and this pressure calibration device is preferably used as a gas pressure calibration device.

[0092] Wherein, when the pressure transmission medium is a gas medium, the input end 240 of the middle cavity 230 of the piston cylinder 200 can be communicated with a gas medium source, and the gas medium source can be the atmosphere. The output end 250 of the middle cavity 230 of the piston cylinder 200 is communicated with the instrument interface 400. Thus, when the piston 220 moves relative to the cylinder block 210 and causes the volume of the cavity 230 to increase, the medium pressure in the cavity 230 decreases. When the medium pressure in the cavity 230 is less than the medium pressure of the gas medium source, the cavity 230 can inhale the gas medium from the input end. When the piston 220 moves relative to the cylinder block 210 and causes the volume of the cavity 230 to decrease, the medium pressure in the cavity 230 increases. When the medium pressure in the cavity 230 is greater than the medium pressure of the instrument interface 400, the gas medium in the cavity 230 can be discharged from the output end to the instrument interface 400, causing the medium pressure at the instrument interface 400 to increase. The piston 220 reciprocates in the cylinder block 210, which can continuously increase the medium pressure at the instrument interface 400; in some examples, the medium pressure at the instrument interface 400 can be increased above the atmospheric pressure.

[0093] In some examples, optionally, the input end 240 of the middle cavity 230 of the piston cylinder 200 is communicated with the instrument interface 400, and the output end of the cavity 230 is communicated with a gas medium such as the atmosphere. Thus, when the piston 220 moves relative to the cylinder block 210 and causes the volume of the cavity 230 to increase, the medium pressure in the cavity 230 decreases until it is less than the medium pressure of the instrument interface 400. The cavity 230 can inhale the gas medium at the instrument interface 400 into the cavity 230 through the input end 240. When the piston 220 moves relative to the cylinder block 21 and causes the volume of the cavity 230 to decrease, the medium pressure in the cavity 230 increases until it exceeds the atmospheric pressure. The gas medium in the cavity 230 can be discharged from the output end to the atmosphere, causing the medium pressure at the instrument interface 400 to decrease. The piston 220 reciprocates in the cylinder block 210, which can continuously decrease the medium pressure at the instrument interface 400; in some examples, the medium pressure at the instrument interface 400 can be decreased below the atmospheric pressure.

[0094] Figure 8 is a pipeline connection diagram of another pressure calibration device provided by an embodiment of the present application. Refer to Figure 6 and Figure 8As shown, in some examples, the pressure transmission medium may also be a liquid medium, and the pressure calibration device is preferably used as a liquid pressure calibration device. Among them, when the pressure transmission medium is a liquid medium, the input end 240 of the middle cavity 230 of the piston cylinder 200 can be communicated with the liquid storage cavity 130, and the output end 250 of the middle cavity of the piston cylinder 200 is communicated with the instrument interface 400. In the preparation stage of the pressure calibration process, a liquid medium serving as the pressure transmission medium is injected into the liquid storage cavity 130. Thus, when the piston 220 moves relative to the cylinder block 210 and the volume of the cavity 230 increases, the cavity 230 can suck in the liquid medium from the input end 240. When the piston 220 moves relative to the cylinder block 210 and the volume of the cavity 230 tends to decrease, the pressure of the medium in the cavity 230 increases until the pressure of the medium in the cavity 230 is greater than the pressure of the medium at the output end 250, and then the pressure transmission medium enters the output end 250 from the cavity 230, and further can be discharged from the output end 250 to the instrument interface 400, so that the pressure of the medium at the instrument interface 400 increases.

[0095] Referring to Figure 3 As shown, in some examples, the instrument interface 400 may include a first pressure interface 410, and the pressure instrument includes a first pressure instrument 10 such as a reference instrument. The pressure calibration device is provided with a structure for fixing the first pressure instrument 10 near the first pressure interface 410, so that when the pressure calibration device is fixedly connected to the first pressure instrument 10, the first pressure interface 410 is communicated with the first pressure instrument 10.

[0096] In some examples, the instrument interface 400 may include a second pressure interface 420 (referring to Figure 6 shown), and the pressure instrument includes a second pressure instrument such as a to-be-tested instrument, and the to-be-tested instrument is communicated with the second pressure interface 420.

[0097] In some examples, the second pressure interface 420 may be arranged on the device main body 100, and the second pressure interface 420 is used to be connected to the second pressure instrument through an external pipeline.

[0098] In the embodiment of the present application, only the first pressure interface 410 is arranged at the instrument connection part 800, and the second pressure interface 420 is arranged at other positions of the device main body 100. Compared with the prior art Figure 1 shown in which the second pressure interface is also arranged on the instrument connection part, the number of pressure instruments fixed on the pressure calibration device can be reduced, and when holding the pressure calibration device with both hands, the stability of the pressure calibration device can be improved.

[0099] For example, a pressure plug 100d may be arranged on the second pressure interface 420 to block the second pressure interface 420. When it is necessary to calibrate the to-be-tested instrument, the pressure plug 100d can be removed, and an external pipeline can be connected to the second pressure interface 420 to connect the to-be-tested instrument.

[0100] For example, the external pipeline can be a pressure calibration bench. The input port of the pressure calibration bench is communicated with the second pressure interface 420, and the output port of the pressure calibration bench is fixed and communicated with the instrument under test, so that the instrument under test is communicated with the second pressure interface 420 of the pressure calibration device through the pressure calibration bench.

[0101] In some examples, the pressure calibration bench has multiple output ports, and there can be multiple instruments under test. The multiple instruments under test can be respectively connected to the corresponding output ports, so that the pressure calibration device can calibrate multiple instruments under test simultaneously. For another example, the external pipeline can be a pipeline connected to the on-site pipeline. Among them, the instrument under test is connected to the on-site pipeline.

[0102] It should be noted that the reference instrument refers to an instrument that provides reference information for the indication accuracy of the instrument under test during the pressure calibration process. Generally, the reference instrument is a pressure instrument with a higher accuracy than the instrument under test. During the pressure calibration process, the tester can compare the measured indication value of the reference instrument with the measured indication value of the instrument under test. If the two are the same or within the allowable deviation range, it can be considered that the instrument under test meets the requirements. On the contrary, if the deviation between the two exceeds the allowable range, it can be considered that the instrument under test has inaccurate measurement.

[0103] In some examples, the pressure calibration device further includes a device main body 100 and an operating structure 300. Among them, one of the piston 220 and the cylinder block 210 of the piston cylinder 200 is arranged on the device main body 100, and the other is connected to the operating structure 300. In this way, by driving the operating structure 300 to move relative to the device main body 100, the piston 220 and the cylinder block 210 can perform relative movement, so that the cavity 230 of the piston cylinder 200 inhales or discharges the pressure transmission medium. It should be noted that the connection between the operating structure 300 and the piston cylinder 200 is a mechanical connection, rather than an electrical connection.

[0104] Taking the cylinder block 210 arranged on the device main body 100 and the piston 220 connected to the operating structure 300 as an example. By driving the operating structure 300, the operating structure 300 drives the piston 220 to move into or out of the cavity 230 relative to the cylinder block 210, so as to discharge or inhale the pressure transmission medium in the cavity 230.

[0105] Of course, in other examples, the piston 220 can be arranged on the device main body 100, and the cylinder block 210 is connected to the operating structure 300. By driving the operating structure 300, the cylinder block 210 is driven to move relative to the piston 220, so as to inhale or discharge the pressure transmission medium in the cavity 230. Refer to Figure 3As shown, in some examples, the device body 100 extends to form a first handheld part 110, and the first handheld part 110 is configured in a shape that is convenient for gripping. A support surface 120a is provided on the device body 100, and the device body 100 can be supported on a workbench through the support surface 120a.

[0106] The operating structure 300 is located on the side of the device body 100 facing away from the support surface 120a. The operating structure 300 extends to form a second handheld part 310, and the second handheld part 310 corresponds to the first handheld part 110. For example, the operating structure 300 may include an operating rod 320, and the second handheld part 310 is provided at one end of the operating rod 320. By holding the second gripping part by hand, the operating structure 300 can be driven to move relative to the device body 100, so that the piston 220 can be driven to move relative to the cylinder block 210 under the drive of the operating structure 300, so that the piston cylinder 200 generates and discharges the pressure transmission medium.

[0107] In some examples, the first fulcrum 320a of the operating rod 320 is rotatably connected to the piston 220, and the second fulcrum 320b of the operating rod 320 is rotatably connected to the connecting part 330 on the cylinder block 210. Among them, the first fulcrum 320a is located in the middle of the operating rod 320, and the second fulcrum 320b is located at the end of the operating rod 320 away from the second handheld part 310. In this way, a lever structure is formed by the cooperation between the operating rod 320 and the connecting part 330. The distance from the second handheld part 310 to the second fulcrum 320b is greater than the distance from the first fulcrum 320a to the second fulcrum 320b. Therefore, by holding the second handheld part 310 and driving the second handheld part 310 to move, it is convenient to drive the piston 220 to move.

[0108] In the embodiment of the present application, the device body 100 extends to form a first handheld part 110, including that the first handheld part 110 is a part of the device body 100, and the area where the device body 100 is connected to the first handheld part 110 is adapted to the structure of the first handheld part 110; it can be understood that the situation of additionally providing a handle on the device body does not belong to the extended formation situation described in the embodiment of the present application.

[0109] In the embodiment of the present application, the support surface 120a may be located on the part of the device body 100 that extends to form the first handheld part 110, or may be located on other structures extending from the device body 100. At least part of the support surface 120a is a plane. When there are multiple support surfaces 120a, the multiple support surfaces 120a are located in the same plane.

[0110] The operating structure 300 is located on the side of the device body 100 facing away from the support surface 120a, so that the operation of the operating structure 300 can be implemented on the side facing away from the support surface 120a.

[0111] The second handheld part 310 corresponds to the first handheld part 110. That is, if the position of the first handheld part 110 corresponds to one of the two hands, the position of the second handheld part 310 corresponds to the other of the two hands, so that the first handheld part 110 and the second handheld part 310 can be respectively held by the two hands.

[0112] Figure 9 It is a state diagram of the pressure calibration device provided by an embodiment of the present application in the first working mode. Refer to Figure 9 As shown, in some examples, during the calibration process, the pressure calibration device can support the support surface 120a of the device main body 100 on the workbench, connect the second pressure interface 420 to the instrument to be measured. The staff can hold the second handheld part 310 of the operation structure 300 and lift the second handheld part 310 in a direction away from the device main body 100, so that the operation structure 300 drives the piston 220 to move out of the chamber 230, increasing the volume of the chamber 230, so that the pressure transmission medium is sucked into the chamber 230. When the volume of the chamber 230 reaches the preset volume, the second handheld part 310 can be pressed in a direction close to the device main body 100, so that the operation structure 300 drives the piston 220 to move into the chamber 230, reducing the volume of the chamber 230, so that the pressure transmission medium is discharged from the output end 250 of the chamber to the instrument interface 400 and the pressure instrument, to calibrate the pressure instrument such as the instrument to be measured.

[0113] For convenience of description, the calibration mode in which the device main body 100 is supported on the workbench can be called the first working mode.

[0114] In some examples, in the first working mode, when it is necessary to quickly provide the pressure transmission medium through the piston cylinder 200, the staff can press on the device main body 100 with one hand and quickly pull up and press down the second handheld part 310 with the other hand to ensure that the device main body 100 is stably supported on the workbench. Of course, in other examples, the staff can also not press the device main body 100.

[0115] Figure 10 It is a state diagram of the pressure calibration device provided by an embodiment of the present application in the second working mode. Refer to Figure 10As shown, in some examples, during the calibration process of the pressure calibration device, a staff member can hold the first holding part 110 with one hand, so that the device main body 100 is vertically suspended in the working space close to the instrument to be measured, and hold the second holding part 310 of the operation structure 300 with the other hand. By controlling the two hands to move away from each other, the operation structure 300 is driven to move the piston 220 out of the chamber 230, so as to increase the volume of the chamber 230, and the pressure transmission medium is inhaled into the chamber 230. When the volume of the chamber 230 reaches the preset volume, the two hands can be controlled to move towards each other, so that the operation structure 300 drives the piston 220 to move into the chamber 230, so as to reduce the volume of the chamber 230, and the pressure transmission medium is discharged from the output end 250 of the chamber into the instrument interface 400 and the pressure instrument, so as to calibrate the pressure instrument, such as the instrument to be measured.

[0116] For the convenience of description, the calibration mode of holding the pressure calibration device with both hands can be called the second working mode.

[0117] In the second working mode, controlling the two hands to move away from each other can be that both hands drive the corresponding holding parts to move away from each other, or it can be that one hand, such as the left hand, holding the first holding part 110 remains stationary, and the other hand, such as the right hand, used to hold the second holding part 310 can move away from the left hand, so that the operation structure 300 moves away from the device main body 100, and thus the operation structure 300 drives the piston 220 to move out of the chamber 230 of the cylinder block 210.

[0118] Controlling the two hands to move towards each other can be that both hands drive the corresponding holding parts to move towards each other, or it can be that one hand, such as the left hand, holding the first holding part 110 remains stationary, and the other hand, such as the right hand, used to hold the second holding part 310 can move towards the left hand, so that the operation structure 300 moves towards the device main body 100, and thus the operation structure 300 drives the piston 220 to move into the chamber 230 of the cylinder block 210.

[0119] It should be noted that in the second working mode, the hand used to hold the first holding part 110 mainly plays a role in supporting the pressure calibration device. In some examples, it can also play a role in driving the driving force for it to move closer to or away from the second holding part 310.

[0120] In the first aspect of the embodiments of the present application, by configuring a set of pressure calibration devices of the embodiments of the present application, it can be used according to the first working mode when there is a workbench on site, or it can be used according to the second working mode when it needs to be suspended to an area close enough to the instrument to be measured, which improves the utilization efficiency of the equipment. Further, in some complex on-site environments that require repeated use between the workbench and the area where the instrument to be measured is located, the pressure calibration device of the embodiments of the present application can change the working mode in real time according to needs, thereby improving the pressure calibration efficiency.

[0121] Based on the foregoing pressure calibration device, an embodiment of the present application provides a method for calibrating the pressure of a pressure instrument at an industrial site. The instrument under test is connected to the on-site pipeline during its operation. The pressure calibration method includes:

[0122] S100. Keep the connection between the instrument under test and the on-site pipeline. The pressure calibration device is connected to at least part of the on-site pipeline through a pipeline. For example, the second pressure interface 420 of the pressure calibration device is connected to the on-site pipeline through a pipeline, so that the pressure calibration device can provide a medium pressure to the instrument under test, and then enter S110.

[0123] It should be noted that the reference instrument can be fixed on the first pressure interface 410 when transporting the pressure calibration device. Of course, in some examples, the reference instrument can be assembled on the first pressure interface 410 after arriving at the industrial site.

[0124] S110. Hold the pressure calibration device with both hands, control the pressure calibration device to generate a medium pressure. When the medium pressure reaches the target pressure value, the reference instrument measures the medium pressure to obtain the indication value of the reference instrument, and the instrument under test measures the same medium pressure to obtain the indication value of the instrument under test. Judge the indication deviation according to the indication value of the reference instrument and the indication value of the instrument under test. If the indication deviation is greater than the allowable deviation, enter S130; if the indication deviation is less than or equal to the allowable deviation, enter S120. Preferably, the pressure calibration device is placed as close as possible to the instrument under test so that the instrument under test and the reference instrument are in the same field of view.

[0125] Exemplarily, in the case of a small space at the industrial site, the second working mode, such as the handheld mode, can be used to calibrate the instrument under test. For example, the first handheld part 110 can be held with the left hand and the second handheld part 310 can be held with the right hand, so that the pressure calibration device is as close as possible to the instrument under test. By controlling the two hands to move towards or away from each other, the piston cylinder 200 of the pressure calibration device outputs a medium pressure to the reference instrument and the instrument under test.

[0126] S120. Complete the calibration of the current instrument under test and prepare to calibrate the next instrument under test.

[0127] S130. Remove the instrument under test from the on-site pipeline, and connect the pressure calibration device to the instrument under test, so that the pressure calibration device can provide a medium pressure to the instrument under test, and then enter S140.

[0128] For example, after removing the instrument to be tested from the on-site pipeline, connect the instrument to be tested to the second pressure interface 420 of the pressure calibration device. For example, the pressure calibration device may further include a pressure connection platform. The input port of the pressure connection platform is connected to the second pressure interface 420, and the output port of the pressure connection platform is fixed and connected to the instrument to be tested, so that the instrument to be tested is connected to the second pressure interface 420 of the pressure calibration device through the pressure connection platform.

[0129] In some examples, the pressure connection platform may have multiple output ports, and each output port can be used to connect an instrument to be tested. So, if there are two or more instruments to be tested in the S100 process, the pressure calibration device can calibrate multiple instruments to be tested simultaneously by using the pressure connection platform.

[0130] Of course, in some examples, the instrument to be tested can be directly connected to the second pressure interface 420.

[0131] S140: Place the pressure calibration device on the nearest workbench or a position that can be used as a workbench (such as a flat ground), control the pressure calibration device to generate a medium pressure. When the medium pressure reaches the target pressure value, the reference instrument measures the medium pressure to obtain the indication value of the reference instrument, and the instrument to be tested measures the same medium pressure to obtain the indication value of the instrument to be tested. Judge the indication deviation according to the indication value of the reference instrument and the indication value of the instrument to be tested. If the indication deviation is greater than the allowable deviation, enter S150; if the indication deviation is less than or equal to the allowable deviation, enter S160.

[0132] In some examples, after the instrument to be tested is connected to the second pressure interface 420 of the pressure calibration device, the support surface 120a of the device body 100 can be supported on the workbench. Then hold the second holding part 310 by hand, and lift or press the second holding part 310, so that the operating structure 300 drives the piston 220 to move relative to the cylinder body 210 out of or into the cavity 230, so that the piston cylinder 200 outputs the medium pressure to the reference instrument and the instrument to be tested.

[0133] It can be understood that if the indication deviation of the instrument to be tested relative to the reference instrument is greater than the allowable deviation, the first working mode, i.e., the desktop support working mode, can be adopted for calibration. By supporting the device body 100 on the workbench and pressing or lifting the operating structure 300, the driving of the piston cylinder 200 is more stable, so that the piston cylinder 200 can provide a more stable medium pressure to the instrument interface 400, making the calibration result more accurate.

[0134] S150: Take the indication value of the reference instrument, the indication value of the instrument to be tested and the indication deviation obtained in S140 as the calibration result of the current instrument to be tested, and enter S120.

[0135] Perform pressure calibration in the first working mode. If the indication deviation is greater than the allowable deviation, then use the indication of the reference instrument, the indication of the instrument under test, and the indication deviation as the calibration result of the current instrument under test. The pressure calibration work of the current instrument under test has been completed, and it is possible to prepare for pressure calibration of the next instrument under test, that is, enter S120.

[0136] S160. Record the connection position of the current instrument under test and the on-site pipeline, prompt that there is a leakage problem at this connection position or the on-site pipeline connected to this connection position, prepare to further judge the cause of the problem, and enter S120.

[0137] Perform pressure calibration in the first working mode. If the indication deviation is less than or equal to the allowable deviation, it can indicate that the performance of the instrument under test itself is good. There may be a problem with the connection position between the current instrument under test and the on-site pipeline, or there may be a problem with the on-site pipeline connected to this connection position. Therefore, the connection position of the current instrument under test and the on-site pipeline can be recorded, prompt that there is a leakage problem at this connection position or the on-site pipeline connected to this connection position, and prepare to further judge the cause of the problem. This process of further judging the cause of the problem can be handed over to another detection process. Considering the on-site calibration efficiency, the pressure calibration work of the current instrument under test has been completed, and it is possible to prepare for pressure calibration of the next instrument under test, that is, enter S120. The pressure calibration device of the prior art can only implement one of the first working mode and the second working mode. If only a pressure calibration device that supports the second working mode is carried, the processes from S130 to S160 cannot be executed on-site, but the instrument under test needs to be taken back to the laboratory for calibration again, and the situation of the instrument under test cannot be accurately judged on-site. If two sets of pressure calibration devices are carried, which respectively support the first working mode and the second working mode, then during the process of S130, the reference instrument needs to be disassembled and assembled. During the subsequent process of S120, the reference instrument also needs to be disassembled and assembled again. This not only reduces the portability of the equipment, but also the repeated disassembly and assembly of the reference instrument will affect the pressure calibration efficiency.

[0138] It should be noted that the relevant step numbers in the pressure calibration method do not constitute a limitation on the step sequence. For example, S100 and S110 can be executed simultaneously or sequentially. The specific step sequence can be adjusted according to the actual situation.

[0139] The pressure calibration device of the embodiment of the present application can work on the workbench or can be separated from the workbench and work in a state of being held by both hands, so as to adapt to the calibration requirements in different on-site environments, improve the use efficiency of the pressure calibration device, and further improve the work efficiency of the entire pressure calibration process.

[0140] In addition, when calibrating the instrument to be tested, only this pressure calibration device needs to be carried, and the reference instrument is always connected to the instrument interface 400 of this pressure calibration device, such as the first pressure interface 410. According to the on-site situation of the instrument to be tested, different usage modes of the pressure calibration device can be selected without repeatedly disassembling and assembling the reference instrument, thereby improving the calibration operation efficiency and reducing the problem of the connection sealing between the reference instrument and the first pressure interface 410 damaged due to repeated replacement of the reference instrument, improving the connection sealing between the reference instrument and the pressure calibration device, and thus improving the calibration accuracy of the pressure calibration device in the embodiment of this application.

[0141] Referring Figure 3 As shown, in some examples, the instrument interface 400 can be arranged to avoid the movement spaces of the first hand-held part 110 and the second hand-held part 310. For example, the instrument interface 400 can be located at one end of the pressure calibration device far from the first hand-held part 110. In this way, when the pressure calibration device is calibrated in the second working mode and the first hand-held part 110 and the second hand-held part 310 are held with both hands and the device body 100 is picked up, the pressure instrument on the instrument interface 400, such as the reference instrument, is located above the first hand-held part 110 and the second hand-held part 310, which is more convenient for the staff to observe.

[0142] Referring Figure 3 and Figure 4 As shown, in some implementation manners, a first concave area 111 is provided on the first hand-held part 110, and the structure of the first concave area 111 is adapted to the fingers to limit the fingers when holding.

[0143] When the pressure calibration device is used in the second working mode, that is, when the pressure calibration device is held with both hands, the hand for holding the first hand-held part 110, such as the left hand, mainly plays a role in supporting the pressure calibration device, so that the pressure calibration device can be stably supported in the space near the instrument to be tested.

[0144] By providing the first concave area 111 on the first hand-held part 110, at least one finger can be located in the concave area, so as to limit the fingers when holding the first holding part, enabling the hand to stably hold the first hand-held part 110 without sliding up and down on the first hand-held part 110, and improving the stability of the pressure calibration device on the hand.

[0145] In some implementation manners, at least two first concave areas 111 are arranged at intervals on the first hand-held part 110.

[0146] In some examples, two adjacent fingers can be respectively inserted into two first recessed areas 111 to further improve the stability of the hand on the first hand-held part 110, so as to enhance the stability of the pressure calibration device on the hand. For example, the distance between two adjacent first recessed areas 111 is less than or equal to 1 cm. For example, the distance between two adjacent first recessed areas 111 can be 1 cm, 0.7 cm, 0.5 cm, 0.35 cm or other appropriate values, and can be specifically selected according to the appropriate distance between two adjacent fingers when holding the first hand-held part 110.

[0147] In some other examples, a friction area 112 is provided between two adjacent first recessed areas 111, and the surface friction coefficient of the friction area 112 is greater than that of the first recessed areas 111.

[0148] When the hand holds the first hand-held part 110, if the palm width is small, among three adjacent fingers, the two fingers on both sides are respectively inserted into the corresponding two first recessed areas 111, and the finger in the middle can be located in the friction area 112. In this way, the stable holding of the palm and the first hand-held part 110 can be ensured. If the palm width is large, adjacent fingers can be respectively located in two adjacent first recessed areas 111; it can be understood that the setting of the friction area 112 can meet the holding requirements of different palm widths and improve the holding stability of the first hand-held part 110. In some examples, the depth of the first recessed areas 111 can be greater than or equal to 1 / 2 of the finger thickness, so as to ensure the stability of the fingers in the first recessed areas 111. For example, the depth of the first recessed areas 111 can be greater than or equal to the finger thickness, so that the fingers can be completely inserted into the first recessed areas 111, thereby improving the limiting effect of the first recessed areas 111 on the fingers.

[0149] Of course, in some examples, the depth of the first recessed areas 111 can be less than 1 / 2 of the finger thickness, as long as it is ensured that a part of the finger is located in the first recessed areas 111.

[0150] In some implementation manners, at least a part of the first recessed areas 111 is provided on the side of the first hand-held part 110 facing the second hand-held part 310, so that the first hand-held part 110 and the second hand-held part 310 are configured to be held relatively by both hands.

[0151] For example, when the left hand holds the first hand-held part 110 and the right hand holds the second hand-held part 310, the fingers of the left hand are located inside the first hand-held part 110, that is, on the side facing the second hand-held part 310. In this way, the first recessed areas 111 can be provided inside the first hand-held part 110 to limit the fingers of the left hand, so that the left hand holds the device main body 100 more stably and the device main body 100 will not slide in the left hand.

[0152] In some examples, a first recessed area 111 may also be provided on a side of the first hand-held portion 110 facing away from the second hand-held portion 310, such as the outer side, or on a side portion of the first hand-held portion 110 perpendicular to the support surface 120a, so as to increase the friction between the palm and the first hand-held portion 110 and improve the holding stability of the entire hand on the first hand-held portion 110.

[0153] In some examples, for the convenience of manufacturing, the first recessed area 111 may be provided as an annular groove surrounding the side wall of the first hand-held portion 110 for one week, that is, the first hand-held portion 110 has a small-diameter section and a large-diameter section in the extending direction, wherein the small-diameter section is the first recessed area 111.

[0154] In some implementation manners, the second hand-held portion 310 is provided with a pressing surface 311 adapted to the palm at a position facing away from the first hand-held portion 110, so as to press the second hand-held portion 310 toward the first hand-held portion 110, reduce the relative distance between the first hand-held portion 110 and the second hand-held portion 310, and enable the piston 220 to move relative to the cylinder block 210 into the cavity 230, so as to reduce the volume of the cavity 230, and enable the pressure transmission medium in the cavity 230 to be output to the instrument interface 400 through the output end.

[0155] For example, when the pressure calibration device is calibrated in the first working mode, the palm of one hand, preferably the dominant hand, can press on the pressing surface 311 of the second hand-held portion 310, so that the palm can apply force to the second hand-held portion 310 in a pressing manner. Since the device main body 100 is supported on the workbench, the first hand-held portion 110 and the second hand-held portion 310 approach each other to drive the piston 220 to move into the cavity 230 and output the pressure transmission medium, thereby improving the pressure stability output to the instrument interface 400.

[0156] For another example, when the pressure calibration device is calibrated in the second working mode, one hand, such as the left hand, holds the first hand-held portion 110, and the right hand holds the second hand-held portion 310. The right hand palm presses on the pressing surface 311 of the second hand-held portion 310, so that the first hand-held portion 110 and the second hand-held portion 310 move toward each other, thereby driving the piston 220 and the cylinder block 210 to move relative to each other, reducing the volume of the cavity 230, and outputting the pressure transmission medium, thereby improving the pressure stability output to the instrument interface 400.

[0157] In some examples, the friction coefficient of the pressing surface 311 of the second hand-held portion 310 may be greater than that of other areas of the second hand-held portion 310, so as to improve the stability when the palm presses on the second hand-held portion 310 and reduce the situation that the palm slides on the second hand-held portion 310.

[0158] Exemplarily, a plurality of protruding portions may be provided at a position of the second handheld portion 310 facing away from the first handheld portion 110, and the area where the plurality of protruding portions are located serves as a pressing surface 311, so that the friction coefficient of the pressing surface 311 is greater than that of other areas of the second handheld portion 310.

[0159] Exemplarily, a plurality of grooves may be provided on a side of the second handheld portion 310 facing away from the first handheld portion 110, and the area where the plurality of grooves are located serves as a pressing surface 311, so that the friction coefficient of the pressing surface 311 is greater than that of other areas of the second handheld portion 310.

[0160] Of course, an anti-slip sticker or anti-slip sleeve with a relatively large friction coefficient may also be provided on a side of the second handheld portion 310 facing away from the first handheld portion 110 to form a pressing surface 311 with a relatively large friction coefficient. The embodiments of the present application do not limit the setting manner of the pressing surface 311.

[0161] In some implementation manners, the second handheld portion 310 is provided with a second recessed area 312 adapted to the fingers at a position facing the first handheld portion 110. By pulling the second handheld portion 310 away from the first handheld portion 110, the relative distance between the first handheld portion 110 and the second handheld portion 310 is increased, so that the piston 220 can move relative to the cylinder block 210 out of the cavity 230 to increase the volume of the cavity 230 to suck in the pressure transmission medium.

[0162] For example, when the pressure calibration device is calibrated in the first working mode, the fingers of one hand are held on the side of the second handheld portion 310 facing the first handheld portion 110, and the fingers are inserted into the second recessed area 312, so that when the fingers pull the second handheld portion 310 to move away from the first handheld portion 110, that is, move upward, the right hand fingers can be restricted within the second recessed area 312. When the second handheld portion 310 has a non-zero angle with the horizontal plane, the situation of the fingers sliding upward along the inclined second handheld portion 310 when pulling the second handheld portion 310 upward is reduced, and the pressure calibration efficiency is improved.

[0163] For another example, when the pressure calibration device is calibrated in the second working mode, one hand, for example, the right hand, holds the second handheld portion 310. By inserting the right hand fingers into the second recessed area 312, the right hand can be stably held on the second handheld portion 310, and the second handheld portion 310 is pulled to move away from the first handheld portion 110, reducing the situation of the right hand sliding along the second handheld portion 310 when pulling the second handheld portion 310 away, and improving the pressure calibration efficiency.

[0164] In some examples, since the purpose of holding the second hand-held portion 310 is to drive the operating structure 300 to move toward or away from the device body 100 without loading the entire pressure calibration device, the depth of the second recessed area 312 can be less than the depth of the first recessed area 111, as long as the fingers can be embedded in the second recessed area 312, so as to play a limiting role when the second hand-held portion 310 moves away from the first hand-held portion 110.

[0165] Of course, in some examples, the configuration of the second recessed area 312 may be consistent with the configuration of the first recessed area 111 , and the embodiment of the present application does not limit the configuration of the second recessed area 312 .

[0166] In some implementations, the projection of the first hand-held portion 110 on the plane where the support surface 120a is located may at least partially overlap with the projection of the second hand-held portion 310 on the plane where the support surface 120a is located. In other words, the first hand-held portion 110 and the second hand-held portion 310 at least partially overlap in the direction perpendicular to the support surface 120a. In this way, when the pressure calibration device is being calibrated in the second working mode, it is convenient for both hands to drive the first hand-held portion 110 and the second hand-held portion 310 to merge closer to each other or to open away from each other, which can reduce the problem of the first hand-held portion 110 and the second hand-held portion 310 being difficult to merge or open due to a large deviation, reduce the operating difficulty when holding the pressure calibration device with both hands, and improve the control efficiency of the piston cylinder.

[0167] In addition, when the pressure calibration device performs pressure calibration in the first working mode, the projection of the first hand-held part 110 on the plane where the support surface 120a is located is at least partially overlapped with the projection of the second hand-held part 310 on the plane where the support surface 120a is located, so that when the second hand-held part 310 is lifted upward or pressed downward, the position of the device body 100 corresponds to the range of motion of the operating structure, reducing the center of gravity offset of the device body 100, and improving the stability of the pressure calibration device during the pressure calibration process. In some examples, the projection of the first hand-held part 110 on the plane where the support surface 120a is located can partially overlap with the projection of the second hand-held part 310 on the plane where the support surface 120a is located.

[0168] In some examples, the projection of the first handheld part 110 on the plane where the support surface 120a is located may completely coincide with a part of the projection of the second handheld part 310 on the plane where the support surface 120a is located. In other words, the first handheld part 110 is located on the plane where the movement track of the second handheld part 310 is located, that is, the opening and closing tracks of the first handheld part 110 and the second handheld part 310 are on the same plane. In this way, it is convenient for both hands to hold the first handheld part 110 and the second handheld part 310 respectively and control the opening and closing of the first handheld part 110 and the second handheld part 310. In addition, when the pressure calibration device is in the second working mode during the calibration process, when both hands control the opening and closing of the first handheld part 110 and the second handheld part 310, the situation that the display angle of the pressure gauge changes due to the opening and closing of the first handheld part 110 and the second handheld part 310 is reduced, so as to facilitate the staff to observe the reading on the reference meter.

[0169] In some examples, the plane where the movement track of the second handheld part 310 is located may be perpendicular to the plane where the support surface 120a of the device body 100 is located, so as to ensure that when the second handheld part 310 presses down or lifts perpendicular to the support surface 120a, the acting force on the support surface 120a of the device body 100 is perpendicular to the support surface 120a, ensuring that the support surface 120a of the device body 100 stably supports on the workbench. In addition, when the pressure calibration device is in the second working mode during the calibration process, it is also convenient for both hands to control the first handheld part 110 and the second handheld part 310 to open and close perpendicular to the support surface 120a, and the speed control during the opening and closing process is more stable, so as to improve the stability of the medium pressure output from the piston 220 to the instrument interface 400, and thus improve the calibration accuracy of the pressure calibration device.

[0170] Refer to Figure 3 As shown, in some implementation manners, in order to improve the support stability of the device body 100 on the workbench, the device body 100 extends to form a support structure 120, and the support surface 120a is arranged on the support structure 120, that is, the device body 100 can be supported on the workbench through the support surface 120a on the support structure 120.

[0171] In the embodiment of the present application, the device body 100 extends to form a support structure 120. Compared with forming a support surface by a certain side surface of the device body 100, the coverage range of the support surface 120a on the workbench can be expanded, and the support stability of the pressure calibration device can be improved.

[0172] In some examples, the support structure 120 may be a strip structure, a block structure or other structures protruding from the remaining surfaces of the device body 100.

[0173] In some examples, since the support structure 120 extends from the device body 100 and the support surface 120a is disposed on the support structure 120, when the support surface 120a is connected to the workbench, there is a gap between the first hand-held portion 110 and the workbench. In this way, when the device body 100 is supported on the workbench, the workbench can be prevented from squeezing, bumping or wearing the first hand-held portion 110, thereby improving the stability of holding the first hand-held portion 110 in the second working mode.

[0174] For example, by extending and forming the support structure 120 on the device body 100, the support structure 120 protrudes from the remaining surface of the device body 100, for example, protrudes from the surface of the first hand-held portion 110. In this way, when the support surface 120a of the support structure 120 supports on the workbench, there can be a gap between the first hand-held portion 110 on the device body 100 and the workbench.

[0175] In some examples, the support surface 120a can be the side surface of the device body 100 itself, and the surface of the first hand-held portion 110 is recessed relative to the support surface 120a. In this way, when the support surface 120a of the device body 100 supports on the workbench, a gap is formed between the first hand-held portion 110 and the workbench.

[0176] In some examples, the support structure 120 and the second hand-held portion 310 are respectively on different sides of the device body 100. For example, the side where the support structure 120 is located and the side where the second hand-held portion 310 is located are opposite sides on the device body 100, and the support structure 120 extends away from the device body 100 so that the support surface 120a protrudes from the surface of the first hand-held portion 110. Another example is that the side where the support structure 120 is located and the side where the second hand-held portion 310 is located are perpendicular sides on the device body 100, and the support structure 120 extends away from the second hand-held portion 310 and forms a support surface 120a at the extended end, so that the support surface 120a is located below the first hand-held portion 110 and there is a gap between the support surface 120a and the first hand-held portion 110.

[0177] In some examples, a plurality of support structures 120 can be arranged at intervals in the length direction of the device body 100. For example, a support structure 120 can be arranged at one end of the device body 100 facing away from the first hand-held portion 110. For example, a support structure 120 can be arranged in the area where the instrument interface 400 is set, and a support structure 120 can be arranged at one end of the device body 100 close to the first hand-held portion 110, so that the device body 100 is stably supported on the workbench. Of course, in some examples, three or more support structures 120 can be arranged at intervals in the length direction of the device body 100. The embodiments of the present application do not limit the number and the setting position of the support structures 120.

[0178] In some implementations, the extending direction of the support structure 120 can be perpendicular to the support surface 120a.

[0179] It should be noted that when the support surface 120a is supported on the workbench, the support surface 120a is parallel to the workbench, so the extending direction of the support structure 120 can be perpendicular to the length direction of the device main body 100.

[0180] In some implementations, the extending direction of the support structure 120 can be multiple directions. For example, the support structure 120 can include a first support connecting member 121 and a second support connecting member 122. One end of the second support connecting member 122 is a constrained end, that is, one end of the second support connecting member 122 is connected to the main body of the device main body 100, and the other end of the second support connecting member 122 is connected to the first support connecting member 121. The support surface 120a is located on the first support connecting member 121.

[0181] It should be noted that for the convenience of description, the area of the device main body 100 other than the support structure 120 is regarded as the main body of the device main body 100.

[0182] In some examples, an acute angle is formed between the first support connecting member 121 and the support surface 120a. In this way, an obtuse angle can be formed between the first support connecting member 121 and the main body of the device main body 100, so that the outer contour dimension of the support surface 120a of the support structure 120 is larger than the dimension of the main body of the support main body, increasing the support area of the support structure 120 on the workbench, thereby improving the support stability of the device main body 100 on the workbench.

[0183] In addition, an obtuse angle is formed between the first support connecting member 121 and the main body of the device main body 100, so that the space formed between the first support connecting member 121 and the main body of the device main body 100 can be embedded with a structure with a larger outer contour dimension on the workbench. For example, a protruding part protrudes on the workbench. When the support surface 120a of the support structure 120 is supported on the workbench, the protruding part can be stuck into the space formed between the first support connecting member 121 and the main body of the device main body 100 to improve the stability of the device main body 100 on the workbench.

[0184] In some examples, the second support connecting member 122 can be in the same extending direction as the first support connecting member 121 or perpendicular to the main body of the device main body 100.

[0185] In some examples, the support surface 120a is disposed on the first support connecting member 121. Wherein, an obtuse included angle is formed between the first support connecting member 121 and the second support connecting member 122. Thus, the space formed between the first support connecting member 121 and the second support connecting member 122 can be embedded with a structure having a relatively large outer contour dimension on the workbench. For example, there is a protruding portion protruding from the workbench. When the support surface 120a of the support structure 120 supports on the workbench, the protruding portion can be snapped into the space formed between the first support connecting member 121 and the second support connecting member 122 to improve the stability of the device main body 100 on the workbench.

[0186] In some examples, the pressure calibration device includes two or more groups of support structures 120. Each group of support structures 120 includes a first support connecting member 121 and a second support connecting member 122. The second support connecting members 122 of two different groups are respectively arranged along the width direction of the main body of the device main body 100, and the first support connecting members 121 of each group are respectively connected to the corresponding second support connecting members 122.

[0187] In some implementation manners, the first support connecting member 121 is rotatably connected to the second support connecting member 122 in a lockable manner to adjust the included angle between the first support connecting member 121 and the second support connecting member 122, so that the space formed between the first support connecting member 121 and the second support connecting member 122 can adapt to protruding portions with different outer surface curvature radii. That is, the included angle between the first support connecting member 121 and the second support connecting member 122 can be adjusted to adapt to the protruding portion with the corresponding curvature radius, so that the first support connecting member 121 and the second support connecting member 122 can be stably clamped on the outer surface of the protruding portion, so that the pressure calibration device can be stably supported on workbenches of different structures and adapt to various complex working environments.

[0188] For example, when the protruding portion is a tubular structure, by adjusting the included angle between the first support connecting member 121 and the second support connecting member 122 to fit the diameter of the protruding portion, so that when the protruding portion is embedded in the space between the first support connecting member 121 and the second support connecting member 122, at least part of the inner surface of the first support connecting member 121 and at least part of the inner surface of the second support connecting member 122 can be in stable contact with the outer surface of the protruding portion.

[0189] In some examples, the inner surfaces of the first support connecting member 121 and the second support connecting member 122 can be set as arc-shaped surfaces to fit the protruding portion with an arc-shaped outer surface, so as to increase the contact area between the first support connecting member 121 and the second support connecting member 122 and the outer surface of the protruding portion, thereby improving the clamping stability.

[0190] Certainly, in the embodiments of the present application, the inner surfaces of the first support connecting member 121 and the second support connecting member 122 can also be set as flat surfaces.

[0191] In some examples, the first support connecting member 121 and the second support connecting member 122 can be rotatably connected through a rotating shaft. For example, the rotating shaft is movably inserted through the end portions where the first support connecting member 121 and the second support connecting member 122 are connected to each other, so that the first support connecting member 121 and the second support connecting member 122 can rotate relative to each other. Additionally, a first locking portion can be provided on one of the first support connecting member 121 and the second support connecting member 122, and a second locking portion can be provided on the other of the first support connecting member 121 and the second support connecting member 122. By the cooperation of the first locking portion and the second locking portion, the locking of the first support connecting member 121 and the second support connecting member 122 is achieved.

[0192] In some examples, the first locking portion can be a limit pin shaft, and the second locking portion can be a plurality of limit holes arranged at intervals along an arc track. When the limit pin shaft is snapped into the corresponding limit hole, the first support connecting member 121 can be locked relative to the second support connecting member 122 at a corresponding angle.

[0193] In some examples, the first locking portion can be a limit protrusion, and the second locking portion can be a plurality of limit grooves arranged at intervals along an arc track. When the limit protrusion is snapped into the corresponding limit groove, the first support connecting member 121 can be locked relative to the second support connecting member 122 at a corresponding angle.

[0194] The embodiments of the present application do not limit the structural settings of the first locking portion and the second locking portion, as long as it can ensure that the first support connecting member 121 is locked relative to the second support connecting member 122 at different angles.

[0195] In some examples, the first support connecting member 121 can be telescopically and lockably connected to the second support connecting member 122 to adjust the total length of the first support connecting member 121 and the second support connecting member 122, that is, by adjusting the length of the support structure 120 to adapt to protrusions of different widths, so that the first support connecting member 121 and the second support connecting member 122 can stably hold on the protrusions of the corresponding width, thereby enabling the pressure calibration device to be stably supported on workbenches of different structures and adapting to various complex working environments.

[0196] In some examples, one of the first support connecting member 121 and the second support connecting member 122 can be movably sleeved on the other, a first locking portion is provided on one of the first support connecting member 121 and the second support connecting member 122, and a second locking portion is provided on the other of the first support connecting member 121 and the second support connecting member 122. The first support connecting member 121 and the second support connecting member 122 are locked by the cooperation of the first locking portion and the second locking portion.

[0197] In some examples, the first locking portion can be a limit pin shaft, and the second locking portion can be a plurality of limit holes arranged at intervals along the telescopic direction. When the limit pin shaft is inserted into the corresponding limit hole, the first support connecting member 121 can be locked relative to the second support connecting member 122 at the corresponding position.

[0198] In some examples, the first locking portion can be a limit protrusion, and the second locking portion can be a plurality of limit grooves arranged at intervals along the telescopic direction. When the limit protrusion is inserted into the corresponding limit groove, the first support connecting member 121 can be locked relative to the second support connecting member 122 at the corresponding position.

[0199] In some implementation manners, the instrument interface 400 of the pressure calibration device can be directly arranged on the device main body 100. For example, the instrument interface 400 can be arranged at one end of the device main body 100 away from the first handheld portion 110 and the second handheld portion 310.

[0200] Refer to Figure 3 As shown, in some implementation manners, the pressure calibration device can further include an instrument connection portion 800 for detachably fixing the first pressure gauge 10. The instrument connection portion 800 is rotatably connected to the device main body 100. Wherein, the instrument interface 400 includes a first pressure interface 410 arranged on the instrument connection portion 800. When the first pressure gauge 100 is fixedly connected to the instrument connection portion 800, the first pressure gauge 10 is communicated with the first pressure interface 410.

[0201] For example, one end of the instrument connection portion 800 is rotatably connected to the device main body 100, and the other end of the instrument connection portion 800 extends away from the device main body 100 to form a structure that can be fixedly connected to the first pressure gauge 10. The first pressure interface 410 is arranged at the other end of the instrument connection portion 800 away from the device main body 100.

[0202] In some examples, the first pressure gauge 10 can be a reference gauge.

[0203] Refer to Figure 9 and Figure 10As shown, in the embodiment of the present application, the instrument connection part 800 for fixing the first pressure instrument 10 is rotatably connected to the device main body 100, so that the included angle between the central axis a1 of the first pressure interface 410 and the plane a2 where the support surface 120a is located can be adjusted. Since the first handheld part 110 extends from the device main body 100 and the support surface 120a is arranged on the device main body 100, therefore, the included angle between the central axis a1 of the first pressure interface 410 and the central axis a3 of the first handheld part 110 can also be adjusted. As a result, the dial of the first pressure instrument 10 on the first pressure interface 410, such as the reference instrument, can be adjusted to an angle convenient for the staff to observe during calibration in different working modes, improving the working efficiency of the pressure calibration device.

[0204] For example, when the pressure calibration device is calibrated in the first working mode, the device main body 100 and the instrument connection part 800 can be rotated to a first relative position, so that the first pressure interface 410 and the support surface 120a are located on both sides of the device main body 100, and a first included angle is formed between the central axis of the first pressure interface 410 and the plane where the support surface 120a is located (as shown by α1 in Figure 9 ). In addition, the dial of the first pressure instrument 10 is rotated relative to the first pressure interface 410 to face the direction of the first handheld part 110 and the second handheld part 310. In this way, under the first included angle, when the staff holds the second handheld part 310 and presses or lifts it, the reading on the first pressure instrument 10 can be conveniently observed, and accordingly, the force applied to the second handheld part 310 and the work done amplitude can be adjusted.

[0205] In some examples, the first included angle can be greater than or equal to 45°, so that the staff can more easily observe the reading on the first pressure instrument 10, reducing the adjustment amplitude of the body posture required by the staff due to the observation angle.

[0206] Exemplarily, according to conditions such as the height of the staff, the first included angle can be set to a suitable angle such as 45°, 50°, 60° or 90°. Exemplarily, when the first included angle is set to 45°, when the distance between the staff's hand and eye is small, the first pressure instrument 10 is within the observation range of their eyes. When the distance between the staff's hand and eye is large, the staff can make the first pressure instrument 10 enter the observation range of their eyes by slightly retreating or squatting slightly.

[0207] For example, when the pressure calibration device is calibrated in the second working mode, the device main body 100 and the instrument connection part 800 can be rotated to the second relative position, so that a second included angle is formed between the central axis of the first pressure interface 410 and the central axis of the first handheld part 110. In this way, at the second included angle, a staff member holds the first handheld part 110 with one hand and the second handheld part 310 with the other hand. Additionally, the dial of the first pressure instrument 10 can be rotated relative to the first pressure interface 410 to the side facing the staff member. When the pressure calibration device is lifted to the space near the instrument to be measured, the first pressure instrument 10 is directly facing or almost directly facing the staff member, so that the staff member can conveniently observe the reading on the first pressure instrument 10.

[0208] In some examples, the second included angle can be less than or equal to 30°, so that the staff member can directly face or almost directly face to observe the reading on the first pressure instrument 10 without continuously rotating the pressure calibration device.

[0209] Exemplarily, according to the spatial layout near the instrument to be measured, the second included angle can be adjusted to appropriate angles such as 30°, 20°, 15°, 0°, etc.

[0210] It can be understood that when the second included angle is 0°, the central axis of the first pressure interface 410 coincides with the central axis of the first handheld part 110. In this way, when the staff member holds the first handheld part 110 and the second handheld part 310 with the plane where the opening and closing trajectory is located facing themselves, the dial of the first pressure instrument 10 can directly face the staff member, making it more convenient to observe the reading on the first pressure instrument 10.

[0211] Figure 11 is Figure 4 The cross-sectional view along X-X at position A in the figure. Refer to Figure 11 As shown, in some examples, the instrument connection part 800 and the device main body 100 can be connected in a matching manner through a rotating shaft 820 and a rotating hole 830. The inner diameter of the rotating hole 830 is adapted to the outer diameter of the rotating shaft 820, so that the rotating shaft 820 can rotate coaxially relative to the rotating hole 830.

[0212] The rotating shaft 820 can be provided on one of the instrument connection part 800 and the device main body 100, and the rotating hole 830 can be provided on the other of the instrument connection part 800 and the device main body 100. For example, there are two sets of the rotating shaft 820 and the rotating hole 830, and the two sets of the rotating shaft 820 and the rotating hole 830 are coaxially arranged; by way of example, the rotating shaft 820 of the first set is provided on the instrument connection part, and the rotating hole 830 of the first set is provided at the corresponding position of the device main body 100 to be adaptively connected to the rotating shaft 820 of the first set. The rotating shaft 820 of the second set is provided on the instrument connection part, and the rotating hole 830 of the second set is provided at the corresponding position of the device main body 100 to be adaptively connected to the rotating shaft 820 of the second set; by another example, the rotating shaft 820 of the first set is provided on the instrument connection part, and the rotating hole 830 of the first set is provided at the corresponding position of the device main body 100 to be adaptively connected to the rotating shaft 820 of the first set. The rotating hole 830 of the second set is provided on the instrument connection part, and the rotating shaft 820 of the second set is provided at the corresponding position of the device main body 100 to be adaptively connected to the rotating hole 830 of the second set; by another example, the rotating hole 830 of the first set is provided on the instrument connection part, and the rotating shaft 820 of the first set is provided at the corresponding position of the device main body 100 to be adaptively connected to the rotating hole 830 of the first set. The rotating hole 830 of the second set is provided on the instrument connection part, and the rotating shaft 820 of the second set is provided at the corresponding position of the device main body 100 to be adaptively connected to the rotating hole 830 of the second set, so as to realize the rotation of the instrument connection part 800 relative to the device main body 100.

[0213] For another example, the rotating shaft 820 can be provided on one of the instrument connection part 800 and the device main body 100, and the rotating hole 830 can be provided on the other of the instrument connection part 800 and the device main body 100. By inserting the rotating shaft 820 into the rotating hole 830, the instrument connection part 800 can rotate relative to the device main body 100.

[0214] Exemplarily, the rotating shaft 820 can be provided on the instrument connection part 800, and the rotating hole 830 can be provided on the device main body 100. By inserting the rotating shaft 820 into the rotating hole 830 of the device main body 100, the instrument connection part 800 can rotate relative to the device main body 100 through the rotating shaft 820.

[0215] In some examples, a part of the instrument connection part 800 can be set as the rotating shaft 820.

[0216] In some examples, the rotating shaft 820 can be provided at one end of the instrument connection part 800.

[0217] In some examples, the rotating shaft 820 can also be arranged on the device main body 100, and the rotating hole 830 can be arranged on the instrument connecting portion 800. By inserting the rotating shaft 820 into the rotating hole 830 of the instrument connecting portion 800, the instrument connecting portion 800 can rotate relative to the device main body 100 around the rotating shaft 820.

[0218] In some implementation manners, the device main body 100 and the instrument connecting portion 800 are unlockably locked in a first relative position to ensure the stability of the instrument connecting portion 800 relative to the device main body 100 in the first relative position.

[0219] For example, a first limiting portion can be arranged on one of the device main body 100 and the instrument connecting portion 800, and a second limiting portion can be arranged on the other of the device main body 100 and the instrument connecting portion 800. Through the cooperation of the first limiting portion and the second limiting portion, the locking of the device main body 100 and the instrument connecting portion 800 in the first relative position is realized.

[0220] Exemplarily, the first limiting portion can be a limiting pin shaft, and the second limiting portion can be a first limiting hole. The limiting pin shaft is inserted into the corresponding first limiting hole, and the instrument connecting portion 800 can be locked relative to the device main body 100 in the first relative position.

[0221] In some examples, the first limiting portion can be a limiting protrusion, and the second limiting portion can be a first limiting groove. The limiting protrusion is inserted into the corresponding first limiting groove, and the instrument connecting portion 800 can be locked relative to the device main body 100 in the first relative position.

[0222] In some implementation manners, the device main body 100 and the instrument connecting portion 800 are unlockably locked in a second relative position to ensure the stability of the instrument connecting portion 800 relative to the device main body 100 in the second relative position.

[0223] For example, a first limiting portion can be arranged on one of the device main body 100 and the instrument connecting portion 800, and a third limiting portion can be arranged on the other of the device main body 100 and the instrument connecting portion 800. Through the cooperation of the first limiting portion and the third limiting portion, the locking of the device main body 100 and the instrument connecting portion 800 in the second relative position is realized.

[0224] Exemplarily, the first limiting portion can be a limiting pin shaft, and the third limiting portion can be a second limiting hole. The limiting pin shaft is inserted into the corresponding second limiting hole, and the instrument connecting portion 800 can be locked relative to the device main body 100 in the second relative position.

[0225] In some examples, the first limiting portion can be a limiting protrusion, and the third limiting portion can be a second limiting groove. The limiting protrusion is inserted into the corresponding second limiting groove, and the instrument connecting portion 800 can be locked relative to the device main body 100 in the second relative position.

[0226] Exemplarily, the first limiting portion may be disposed on the instrument connection portion 800, and the second and third limiting portions may be disposed on the device main body 100. When the first limiting portion cooperates with the second limiting portion, the instrument connection portion 800 can be locked to the first relative position relative to the device main body 100. When the first limiting portion cooperates with the third limiting portion, the instrument connection portion 800 can be locked to the second relative position relative to the device main body 100.

[0227] Wherein, when the first limiting portion is a limiting pin shaft, the second limiting portion is a first limiting hole, and the third limiting portion is a second limiting hole. The first limiting hole and the second limiting hole can be arranged at intervals along the rotation trajectory of the instrument connection portion 800.

[0228] It can be understood that when the first limiting portion is a limiting protrusion, the second limiting portion is a first limiting groove, and the third limiting portion is a second limiting groove. The first limiting groove and the second limiting groove can be arranged at intervals along the rotation trajectory of the instrument connection portion 800.

[0229] The embodiments of the present application do not limit the structures and positions of the first limiting portion and the second limiting portion, as long as it is ensured that the instrument connection portion 800 and the device main body 100 can be unlocked and locked to the first relative position or the second relative position.

[0230] Continue to refer to Figure 11 As shown, in some implementation manners, to enable the first pressure interface 410 to communicate with the output end 250 of the cavity of the piston cylinder 200, a first pressure guiding port 150a may be provided on the rotating shaft 820, and a second pressure guiding port 150b is provided in the rotating hole 830. The first pressure guiding port 150a and the second pressure guiding port 150b are connected through the rotating hole 830.

[0231] Exemplarily, the rotating hole 830 is a blind hole, the second pressure guiding port 150b is provided at the center of the bottom of the blind hole, and the first pressure guiding port 150a is provided at the center of the end of the rotating shaft 820. When the rotating shaft 820 rotates relative to the rotating hole 830, the relative positions of the first pressure guiding port 150a and the second pressure guiding port 150b remain unchanged, and the first pressure guiding port 150a and the second pressure guiding port 150b are connected through the rotating hole 830.

[0232] Exemplarily, the rotation hole 830 is a blind hole. The rotation shaft 820 is disposed in the rotation hole 830 with a gap between the rotation shaft and the bottom of the blind hole. The second pressure tapping port 150b is disposed at the bottom or the side wall of the blind hole and at least partially exposed in the gap between the rotation shaft 820 and the rotation hole 830. The first pressure tapping port 150a is disposed at the end of the rotation shaft 820 and thus exposed in the gap between the rotation shaft 820 and the rotation hole 830. When the rotation shaft 820 rotates relative to the rotation hole 830, the first pressure tapping port 150a and the second pressure tapping port 150b are communicated through the rotation hole 830.

[0233] Exemplarily, the rotation shaft 820 is disposed in the instrument connection part 800, the rotation hole 830 is disposed in the device main body 100. The first pressure tapping port 150a is communicated with the first pressure interface 410, and the second pressure tapping port 150b is communicated with the output end 250 of the cavity, so as to realize the communication between the first pressure interface 410 and the output end 250 of the cavity of the piston cylinder 200.

[0234] Exemplarily, the rotation shaft 820 is disposed in the device main body 100, the rotation hole 830 is disposed in the instrument connection part 800. The first pressure tapping port 150a is communicated with the output end 250 of the cavity, and the second pressure tapping port 150b is communicated with the first pressure interface 410, so as to realize the communication between the first pressure interface 410 and the output end 250 of the cavity of the piston cylinder 200.

[0235] In some examples, the pressure calibration device may further include a rotary seal 840 disposed between the outer wall of the rotation shaft 820 and the inner wall of the rotation hole 830. In this way, on the one hand, the sealing performance of the instrument connection part 800 and the device main body 100 at the rotation connection position can be realized, thus ensuring the sealing performance at the communication part of the first pressure tapping port 150a and the second pressure tapping port 150b. On the other hand, the rotation connection between the instrument connection part 800 and the device main body 100 is realized by the rotation fit of the rotation shaft 820 and the rotation hole 830, which is more convenient for the setting of the rotary seal 840, simplifies the structure and assembly process of the rotary seal 840. For example, the rotary seal 840 can be set as an O-ring and sleeved on the outer wall of the rotation shaft 820, so as to realize the sealing performance of the instrument connection part 800 and the device main body 100 at the rotation connection position. During the rotation of the rotation shaft 820 relative to the rotation hole 830, the position of the rotary seal 840 will not be affected, ensuring the assembly stability of the rotary seal 840 on the rotation shaft 820. In addition, since the rotation direction is perpendicular to the sealing direction, compared with other situations of the rotation direction and the sealing direction, the service life and sealing effect of the rotary seal 840 can be improved.

[0236] In some examples, a plurality of rotary seals 840 may be spaced apart in the extending direction of the rotary shaft 820 to improve the sealing performance of the instrument connection portion 800 and the device main body 100 at the rotary connection position.

[0237] In some examples, the pressure guiding port located in the instrument connection portion 800, such as the first pressure guiding port 150a, may be directly communicated with the first pressure interface 410. For example, when the instrument connection portion 800 is the rotary shaft 820, a through hole is formed in the rotary shaft 820 in the radial direction, and one opening end of the through hole may serve as the first pressure guiding port 150a, and the other opening end of the through hole serves as the first pressure interface 410.

[0238] In some examples, a first pipeline 810 may be formed in the instrument connection portion 800, such as the rotary shaft 820. One end of the first pipeline 810 is communicated with the first pressure interface 410, and the other end is communicated with the pressure guiding port, such as the first pressure guiding port 150a.

[0239] In some examples, the pressure guiding port located on the device main body 100, such as the second pressure guiding port 150b, may be directly communicated with the output end of the piston cylinder 200. For example, when the cavity 230 of the piston cylinder 200 is arranged inside the device main body 100, the pressure guiding port on the device main body 100 may directly serve as the output end of the piston cylinder 200.

[0240] In some examples, the relative rotation trajectory of the instrument connection portion 800 and the device main body 100 may be in the same plane as the movement trajectory of the second handheld portion 310. In this way, it can be ensured that the instrument rotating portion 800 can rotate more precisely to the first relative position and the second relative position, and the assembly method of the rotary seal 840 is simplified.

[0241] Figure 12 is Figure 4 The cross-sectional view of A in [Figure] along the Y-Y direction. Refer to Figure 3 、 Figure 11 and Figure 12 As shown in [Figure], in some examples, a part of the device main body 100 is independently arranged from the piston cylinder 200, and the piston cylinder 200 is located on one side wall of a part of the device main body 100. Then, a second pipeline 150 may be formed in the device main body 100. One end of the second pipeline 150 is communicated with the second pressure guiding port 150b, and the other end of the second pipeline 150 is communicated with the output end 250 of the cavity in the piston cylinder 200.

[0242] Figure 13 is Figure 4 The cross-sectional view of B in [Figure] along the Y-Y direction. Refer to Figure 1 and Figure 11As shown, in some implementations, a pressure regulating chamber 500 with a variable volume is formed inside the first handheld part 110. The pressure regulating chamber 500 communicates with the output end 250 of the chamber to adjust the pressure of the pressure transmitting medium output from the piston cylinder 200. It should be noted that the inside of the first handheld part 110 refers to the internal structure of the first handheld part 110.

[0243] Through the cooperation of the pressure regulating chamber 500 and the piston cylinder 200, the accuracy of adjusting the pressure output to the instrument interface 400 can be improved, so that the pressure output to the instrument interface 400 can reach the target pressure more accurately, or be within a suitable error range from the target pressure. For example, the medium pressure can be first provided by the piston cylinder 200 to make the medium pressure output to the instrument interface 400 change towards the target pressure. When the difference between the medium pressure at the instrument interface 400 and the target pressure reaches the adjustable pressure change range of the pressure regulating chamber 500, the volume of the pressure regulating chamber 500 is adjusted to adjust the medium pressure. Since the pressure regulating chamber 500 communicates with the output end 250 of the chamber and also with the instrument interface 400, the change in the volume of the pressure regulating chamber 500 can adjust the medium pressure at the instrument interface 400. Compared with only using the piston cylinder 200 for pressure adjustment, the accuracy of adjusting the output pressure can be improved, and it is also more conducive for the operator to manually adjust the pressure. Compared with only using the pressure regulating chamber 500 for pressure adjustment, the pressure adjustment efficiency can be improved.

[0244] In some examples, the input end of the pressure regulating chamber 500 can communicate with the output end 250 of the chamber, and the output end of the pressure regulating chamber 500 communicates with the instrument interface 400, so that the output end 250 of the chamber communicates with the instrument interface 400 through the pressure regulating chamber 500. In this way, on the one hand, since the pressure regulating chamber 500 is located between the output end 250 of the chamber and the instrument interface 400 in the pipeline connection relationship, the adjustment efficiency of the medium pressure at the instrument interface 400 by the pressure regulating chamber 500 can be improved. On the other hand, the output end 250 of the chamber communicates with the instrument interface 400 through the pressure regulating chamber 500, which can reduce the direct entry of the medium pressure output from the output end 250 of the chamber into the instrument interface 400, thereby reducing the occurrence of large pressure fluctuations at the instrument interface 400 and improving the stability of the medium pressure at the instrument interface 400.

[0245] When the output end 250 of the chamber communicates with the instrument interface 400 through the pressure regulating chamber 500, one end of the second pipeline 150 communicates with the pressure regulating chamber 500, and the other end communicates with the instrument interface 400. For example, the pressure regulating chamber 500 can communicate with the instrument interface 400 through the second pipeline 150 and the first pipeline 810. The pressure transmitting medium passes through the chamber 230, the pressure regulating chamber 500, the second pipeline 150 and the first pipeline 810 in sequence, and finally reaches the first pressure interface 410.

[0246] Refer to Figure 3 andFigure 7 As shown, in some examples, a third shut-off valve 100c may be provided on the upper part of the device body 100. The third shut-off valve 100c is provided on the second pipeline 150, and the control end of the third shut-off valve 100c may be exposed on the side wall of the device body 100 for manual operation. When the third shut-off valve 100c is in the closed state, the pressure regulating chamber 500 can be isolated from the instrument interface 400 to interrupt the supply of medium pressure from the pressure regulating chamber 500 or the piston cylinder 200 to the instrument interface 400. For example, when the medium pressure at the instrument interface 400 reaches the target pressure, closing the third shut-off valve 100c can reduce the influence of the piston cylinder 200 and the pressure regulating chamber 500 on the medium pressure at the instrument interface 400.

[0247] In some examples, the input end 240 of the chamber is in communication with the pressure-transmitting medium, the output end 250 of the chamber is in communication with the instrument interface 400, and a pipeline is led out from the communication pipeline between the output end 250 of the chamber and the instrument interface 400 and connected to the pressure regulating chamber 500.

[0248] In the embodiment of the present application, by forming the pressure regulating chamber 500 inside the first handheld part 110, on the one hand, the structure of the device body 100 itself can be reasonably utilized to make the structure of the pressure calibration device more compact. On the other hand, forming the pressure regulating chamber 500 inside the first handheld part 110 can reserve enough space between the first handheld part 110 and the second handheld part 310 for the second handheld part 310 to move closer to or away from the first handheld part 110, reducing the interference of the pressure regulating chamber 500 on the operating structure 300.

[0249] In the embodiment of the present application, by arranging the pressure regulating chamber 500 inside the first handheld part 110, it enables the staff to first adjust the second handheld part 310 and then adjust the pressure regulating chamber 500 while keeping the load-bearing hand (holding the first handheld part 110) unchanged. Compared with arranging the pressure regulating chamber 500 in the second handheld part 310 or in other positions, it reduces the load-bearing change of the pressure calibration device in the double-handed holding posture and improves the operation experience of the staff.

[0250] Refer to Figure 13 As shown, for example, an inner cavity may be opened inside the first handheld part 110, and all or part of this inner cavity serves as the pressure regulating chamber 500.

[0251] In some implementation manners, the pressure calibration device may further include a pressure regulating piston 600 and a pressure regulating rod 700. Among them, the pressure regulating piston 600 is movably arranged in the pressure regulating chamber 500 to adjust the volume of the pressure regulating chamber 500.

[0252] The pressure regulating rod 700 is used to drive the pressure regulating piston 600. One end of the pressure regulating rod 700 is connected to the pressure regulating piston 600, and the other end of the pressure regulating rod 700 extends out from the first handheld part 110 to facilitate the manual control of the pressure regulating rod 700. For example, the other end of the pressure regulating rod 700 extends out from the end of the first handheld part 110 facing away from the instrument interface 400 to facilitate the manual control of the movement of the pressure regulating rod 700.

[0253] In some examples, the pressure regulating rod 700 is connected to the inner wall of the pressure regulating chamber 500 through a threaded fit. By rotating the pressure regulating rod 700, the movement stroke of the pressure regulating piston 600 can be controlled to control the medium pressure of the instrument interface 400.

[0254] In some examples, a pressure regulating handle 710 can be provided at the end of the pressure regulating rod 700 extending out of the first handheld part 110. By rotating the pressure regulating handle 710, it is convenient to drive the pressure regulating rod 700 to rotate relative to the pressure regulating chamber 500.

[0255] In the embodiments of the present application, both the operating structure 300 and the pressure regulating rod 700 are manually controlled structures to respectively control the piston cylinder 200 and the pressure regulating chamber 500 to adjust the pressure transmission medium, so that the pressure calibration device meets the explosion-proof requirements.

[0256] Figure 14 Yes Figure 3 is a schematic structural diagram of the commutation part in the first conduction state. Figure 15 Yes Figure 3 is a schematic structural diagram of the commutation part in the second conduction state. Refer to Figure 3 、 Figure 14 and Figure 15 As shown in, in some examples, when the pressure calibration device is a gas calibration device, the device body 100 may include a commutation part 140. The commutation part 140 is provided with a medium input port 141a, a first connection port 141b, a second connection port 141c, and a third connection port 141d. Among them, the medium input port 141a is used to communicate with the external gas medium, the first connection port 141b can communicate with the instrument interface 400, for example, it can communicate with the input end of the pressure regulating chamber 500, the second connection port 141c communicates with the input end 240 of the chamber, and the third connection port 141d communicates with the output end 250 of the chamber.

[0257] When the commutation part 140 is in the first conduction state, the second connection port 141c is communicated with the medium input port 141a, and the third connection port 141d is communicated with the first connection port 141b, so that the input end 240 of the cavity is communicated with the external gas medium, and the output end 250 of the cavity is communicated with the instrument interface 400. In this way, the cavity 230 can be driven by the operation structure 300 to inhale the external gas medium and output it to the instrument interface 400, so that the medium pressure at the instrument interface 400 increases. If the initial pressure of the instrument interface 400 is the atmospheric pressure, the pressure calibration device can provide a positive pressure to the pressure gauge, that is, a medium pressure higher than the atmospheric pressure.

[0258] When the commutation part 140 is in the second conduction state, the second connection port 141c is communicated with the first connection port 141b, and the third connection port 141d is communicated with the medium input port 141a, so that the input end 240 of the cavity is communicated with the instrument interface 400, and the output end 250 of the cavity is communicated with the external gas medium. In this way, the cavity 230 can be driven by the operation structure 300 to inhale the pressure transmission medium at the instrument interface 400 and output it to the external gas source, so that the medium pressure at the instrument interface 400 decreases. If the initial pressure of the instrument interface 400 is the atmospheric pressure, the pressure calibration device can provide a negative pressure to the pressure gauge, that is, a medium pressure lower than the atmospheric pressure.

[0259] Through the setting of the commutation part 140, the voltage regulation range of the pressure calibration device can be increased, so that the pressure calibration device can output negative pressure and positive pressure as required, thereby increasing the pressure calibration range for the instrument under test.

[0260] Refer to Figure 3 As shown, in some examples, the commutation part 140 can be arranged at one end of the first handheld part 110 facing the instrument interface 400. For example, it can be arranged between the piston cylinder 200 and the first handheld part 110 to extend the length of the entire device body 100, so that the positions of the first handheld part 110 and the second handheld part 310 are more corresponding.

[0261] In some examples, the commutation part 140 may include a commutation cavity 141 and a commutation block 142. The above-mentioned first connection port 141b, second connection port 141c, third connection port 141d, and medium input port 141a are respectively arranged on the cavity wall of the commutation cavity 141. The commutation block 142 is movably arranged in the commutation cavity 141. The commutation block 142 is provided with a first commutation port 142a, a second commutation port 142b, a third commutation port 142c, a fourth commutation port 142d, a fifth commutation port 142e, and a sixth commutation port 142f. Among them, the first commutation port 142a is communicated with the second commutation port 142b through a first commutation pipeline, the third commutation port 142c is communicated with the fourth commutation port 142d through a second commutation pipeline, and the fifth commutation port 142e is communicated with the sixth commutation port 142f through a third commutation pipeline. The first commutation pipeline, the second commutation pipeline, and the third commutation pipeline are isolated from each other.

[0262] In the first conduction state, the first commutation port 142a is hermetically connected to the cavity wall of the commutation cavity 141, the second commutation port 142b is hermetically connected to the cavity wall of the commutation cavity 141, the second connection port 141c is connected to the medium input port 141a through the commutation cavity 141, the third commutation port 142c is connected to the third connection port 141d, the fourth commutation port 142d is connected to the first connection port 141b, and the fifth commutation port 142e is hermetically connected to the cavity wall of the commutation cavity 141;

[0263] In the second conduction state, the first commutation port 142a is connected to the second connection port 141c, the second commutation port 142b is connected to the first connection port 141b, the third commutation port 142c is hermetically connected to the cavity wall of the commutation cavity 141, the fourth commutation port 142d is hermetically connected to the cavity wall of the commutation cavity 141, the fifth commutation port 142e is connected to the third connection port 141d, and the sixth commutation port 142f is connected to the medium input port 141a.

[0264] In the embodiment of the present application, by driving the commutation block 142 to move in the commutation cavity 141, the commutation part 140 is switched between the first conduction state and the second conduction state. The commutation part 140 driven mechanically makes the pressure calibration device have higher safety performance under any working conditions.

[0265] In some examples, the operating end of the commutation block 142 may extend out of the side wall of the device body. For example, the commutation block 142 and the third stop valve 100c may be respectively located on two opposite side walls of the device main body 100, so as to provide a suitable space for the installation and operation of the third stop valve 100c and the commutation block 142.

[0266] In some examples, the second pipeline 150 can penetrate through the reversing block 142 of the reversing part 140, so that both ends of the second pipeline 150 are respectively communicated with the first pipeline 810 and the output end 250 of the pressure regulating chamber 500. Among them, the second pipeline 150 is isolated from the reversing chamber 141 of the reversing part 140.

[0267] Figure 16 It is a schematic structural diagram of a liquid storage chamber in another pressure calibration device provided by an embodiment of the present application. Refer to Figure 6 、 Figure 8 and Figure 16 As shown, in some implementation manners, when the pressure calibration device is a liquid calibration device, the device main body 100 may further include a liquid storage chamber 130. The input end 240 of the chamber is communicated with the liquid storage chamber 130. For example, the liquid outlet 131 of the liquid storage chamber 130 is communicated with the input end 240 of the chamber, so as to provide a liquid pressure transmission medium for the piston cylinder 200 through the liquid storage chamber 130. The structural position of the liquid storage chamber 130 is set between the piston cylinder 200 and the instrument interface 400, so that when holding the first holding part 110 and the second holding part 310 with both hands, the instrument interface 400 is located above the first holding part 110 and the second holding part 310, and the position of the liquid storage chamber 130 is higher than the position of the piston cylinder 200.

[0268] It can be understood that when the liquid storage chamber 130 is arranged between the piston cylinder 200 and the instrument interface 400, a part of the side wall of the liquid storage chamber 130 close to the piston cylinder 200 serves as the bottom of the liquid storage chamber 130 when the pressure calibration device is in a two-handed holding state. In this way, when holding the first holding part 110 and the second holding part 310 with both hands, the liquid medium in the liquid storage chamber 130 has gravitational potential energy relative to the piston cylinder 200. Preferably, the liquid outlet 131 of the liquid storage chamber 130 can be arranged on the part of the side wall of the liquid storage chamber 130 close to the piston cylinder 200, so that the chamber 230 can effectively suck the liquid medium, reduce the possibility of sucking air, improve the working efficiency and stability of the piston cylinder 200. Since the pressure regulating chamber 500 is communicated with the output end 250 of the chamber, reducing the sucked air is also beneficial to the accuracy of the pressure adjustment of the liquid medium by the pressure regulating chamber 500.

[0269] Refer to Figure 3As shown, it should be noted that the liquid storage chamber 130 has a first side wall and a second side wall C oppositely arranged along the length direction of the device main body 100, and an annular peripheral wall D located between the first side wall and the second side wall C. Among them, the second side wall is close to the piston cylinder 200, and a part of the side wall of the liquid storage chamber 130 close to the piston cylinder 200 includes the second side wall and the position of the annular peripheral wall close to the second side wall. In this way, the liquid outlet 131 can be set at any position of the second side wall and the annular peripheral wall close to the second side wall. On the basis of improving the flexibility of the setting position of the liquid outlet 131, the chamber 230 can effectively inhale the liquid medium, reduce the possibility of inhaling air, and improve the working efficiency of the piston cylinder 200 and the pressure regulation accuracy of the pressure regulation chamber 500.

[0270] Among them, the liquid storage chamber 130 can be arranged inside the device main body 100, and the second pipeline 150 can penetrate through the liquid storage chamber 130 and is isolated from the liquid medium in the liquid storage chamber 130.

[0271] Referring to Figure 8 and Figure 16 As shown, in some examples, the liquid storage chamber 130 also has a liquid inlet 134 and a liquid discharge port 133. Among them, a liquid inlet valve 135 is arranged on the liquid inlet 134 to open the liquid inlet valve 135 when needed to inject the liquid medium into the liquid storage chamber 130. A liquid discharge valve 136 is arranged on the liquid discharge port 133 to open the liquid discharge valve 136 after the verification is completed to discharge the liquid medium in the liquid storage chamber 130, for example, it can be discharged into the liquid storage container.

[0272] Referring to Figure 8 As shown, in some implementation manners, an exhaust circuit is arranged in the device main body 100. One end of the exhaust circuit is communicated with the liquid storage chamber 130. For example, one end of the exhaust circuit is communicated with the liquid inlet 132 of the liquid storage chamber 130, and the other end of the exhaust circuit is communicated with the output end 250 of the chamber. In this way, the liquid storage chamber 130, the exhaust circuit and the chamber 230 can form a cycle circuit with controllable on-off.

[0273] Among them, a first stop valve 100a is arranged on the exhaust circuit, and the first stop valve 100a is used to control the on-off of the exhaust circuit.

[0274] In some examples, the other end of the exhaust circuit can be communicated with the output end 250 of the chamber through the pressure regulation chamber 500.

[0275] Exemplarily, during the pressure calibration process, first, the first shut-off valve 100a is configured to be in an open state. At this time, the liquid inlet 132 of the liquid storage chamber 130 is connected to the output end 250 of the chamber of the piston cylinder 200. By using the piston cylinder 200 to generate a medium pressure, the liquid medium flows out from the liquid outlet 131 of the liquid storage chamber 130, passes through the piston cylinder 200 and the pressure regulating chamber 500, and then returns to the liquid storage chamber 130 in a gas-liquid mixed state. Thus, the gas that may exist in the pipeline is discharged into the liquid storage chamber 130 by using the liquid medium. Since the density of the gas is less than that of the liquid medium, the gas entering the liquid storage chamber 130 will be separated from the liquid due to the influence of gravity. When holding the pressure calibration device with both hands, the liquid storage chamber 130 is higher than the piston cylinder 200. Therefore, the piston cylinder 200 will not bring the gas into the pipeline again when extracting the medium. Continuing this process can reduce the gas in the pipeline of the pressure calibration device. Subsequently, the first shut-off valve 100a is configured to be in a closed state, and the liquid inlet 132 of the liquid storage chamber 130 is isolated from the output end of the piston cylinder 200. By generating a medium pressure through the piston cylinder 200 and adjusting the medium pressure through the pressure regulating chamber 500, the medium pressure is then transmitted to the instrument interface 400 through the pipeline connection relationship. Since the gas in the pipeline has been discharged, the pressure influence of the gas on the liquid medium is reduced, and the accuracy of the medium pressure is improved.

[0276] In some examples, a third pipeline 160 may be provided on the device main body 100. One end of the third pipeline 160 is connected to the liquid inlet 132 of the liquid storage chamber 130, and the other end of the third pipeline 160 is connected to the second pipeline 150, so that a part of the third pipeline 160 and the second pipeline 150 can be used as part of the exhaust circuit.

[0277] It should be noted that the fourth pipeline 170 connecting the output end of the piston cylinder 200 and the pressure regulating chamber 500, and the fifth pipeline 180 connecting the input end of the piston cylinder 200 and the liquid outlet 131 of the liquid storage chamber 130 are another part of the exhaust circuit. In this way, the gas in the fourth pipeline 170, the fifth pipeline 180 and the second pipeline 150 can be discharged by using the liquid medium.

[0278] For example, one end of the third pipeline 160 can be connected to the output end of the third shut-off valve 100c. When exhaust is required, the first shut-off valve 100a and the third shut-off valve 100c can be opened first, so that the liquid in the liquid storage chamber 130 enters the liquid storage chamber 130 through the fifth pipeline 180, the piston cylinder 200, the fourth pipeline 170, the pressure regulating chamber 500, the second pipeline 150 and the third pipeline 160. After the gas in each pipeline is discharged, the first shut-off valve 100a is closed, so that the piston cylinder 200 and the pressure regulating chamber 500 transmit the pressure of the liquid medium to the instrument interface 400, and then to the pressure gauge.

[0279] Refer to Figure 3As shown, in some implementations, a pressure relief port communicating with the instrument interface 400 is provided on the device main body 100, and a second stop valve 100b is provided on the pressure relief port to control the opening and closing of the pressure relief port.

[0280] In some examples, the pressure relief port can communicate with the second pipeline 150 of the device main body 100 to communicate with the instrument interface 400.

[0281] By providing the pressure relief port on the device main body 100 and communicating it with the second pipeline 150, it is convenient to shorten the pipeline length between the pressure relief port and the instrument interface 400, thereby improving the pressure relief efficiency.

[0282] The above specific implementation manners further elaborate on the purpose, technical solutions, and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation manners of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent replacements, improvements, 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 calibration device, characterized in that, Comprising: A device main body, the device main body extending to form a first hand-held portion, the first hand-held portion being configured in a shape facilitating gripping, and a support surface being provided on the device main body; A piston cylinder, the piston cylinder including a cylinder body and a piston, a cavity with a variable volume and having an input end and an output end being formed between the piston and the cylinder body, so as to suck a pressure transmission medium from the input end of the cavity when the volume of the cavity increases, and discharge the pressure transmission medium from the output end of the cavity when the volume of the cavity decreases, one of the cylinder body and the piston being provided on the device main body; An operating structure, located on a side of the device main body facing away from the support surface, the other of the cylinder body and the piston being connected to the operating structure, the operating structure extending to form a second hand-held portion, the second hand-held portion corresponding to the first hand-held portion; An instrument interface, for providing a pressure transmission medium to a pressure gauge, the instrument interface being communicated with the output end of the cavity.

2. The pressure calibration device according to claim 1, wherein A first recessed area is provided on the first hand-held portion, and the structure of the first recessed area is adapted to the fingers to limit the fingers during gripping.

3. The pressure calibration device according to claim 2, wherein At least two of the first recessed areas are spaced apart on the first hand-held portion; The distance between two adjacent first recessed areas is less than or equal to 1 cm; or, a friction area is provided between two adjacent first recessed areas, and the surface friction coefficient of the friction area is greater than the surface friction coefficient of the first recessed area.

4. The pressure calibration device according to claim 2, characterized in that, At least part of the first recessed area is provided on a side of the first hand-held portion facing the second hand-held portion, so that the first hand-held portion and the second hand-held portion are configured to be held relatively by both hands.

5. The pressure calibration device according to claim 1, characterized in that The second hand-held portion is provided with a pressing surface adapted to the palm at a position facing away from the first hand-held portion to press the second hand-held portion toward the first hand-held portion, so as to reduce the relative distance between the first hand-held portion and the second hand-held portion; And / or The second hand-held portion is provided with a second recessed area adapted to the fingers at a position facing the first hand-held portion to pull the second hand-held portion away from the first hand-held portion, so as to increase the relative distance between the first hand-held portion and the second hand-held portion.

6. The pressure calibration device according to claim 5, wherein The projection of the first hand-held portion on the plane where the support surface is located at least partially coincides with the projection of the second hand-held portion on the plane where the support surface is located.

7. The pressure calibration device according to claim 1, characterized in that The device main body extends to form a support structure, and the support surface is provided on the support structure, When the support surface is connected to a workbench, there is a gap between the first hand-held portion and the workbench.

8. The pressure calibration device according to claim 7, wherein The support structure includes a first support connecting member and a second support connecting member; An acute angle is formed between the first support connecting member and the support surface; or, the support surface is provided on the first support connecting member, the second support connecting member is connected to the first support connecting member, and an obtuse angle is formed between the first support connecting member and the second support connecting member.

9. The pressure calibration device according to claim 7, wherein, The support structure includes a first support connecting member and a second support connecting member; The first support connecting member is rotatably connected to the second support connecting member in a lockable manner to adjust the angle between the first support connecting member and the second support connecting member; and / or The first support connecting member is telescopically and lockably connected to the second support connecting member to adjust the total length of the first support connecting member and the second support connecting member.

10. The pressure calibration device according to any one of claims 1-9, characterized in that, It further includes: An instrument connection portion for detachably fixing a first pressure instrument, and the instrument connection portion is rotatably connected to the device body: The instrument interface includes a first pressure interface provided on the instrument connection portion.

11. The pressure calibration device according to claim 10, wherein The device body and the instrument connection portion are unlockably locked in a first relative position, such that the first pressure interface and the support surface are on both sides of the device body, and a first angle is formed between the central axis of the first pressure interface and the plane of the support surface, and the first angle is greater than or equal to 45°; or, The device body and the instrument connection portion are unlockably locked in a second relative position, such that a second angle is formed between the central axis of the first pressure interface and the central axis of the first hand-held portion, and the second angle is less than or equal to 30°.

12. The pressure calibration device according to claim 10, characterized in that, It further includes: A rotating shaft provided with a first pressure guiding port thereon; A rotating hole, the inner diameter of the rotating hole is adapted to the outer diameter of the rotating shaft, such that the rotating shaft can rotate coaxially relative to the rotating hole, and a second pressure guiding port is provided in the rotating hole, and the first pressure guiding port and the second pressure guiding port are connected through the rotating hole; A rotating seal member provided between the outer wall of the rotating shaft and the inner wall of the rotating hole; The rotating shaft is provided on the instrument connection portion, the first pressure guiding port is communicated with the first pressure interface, the rotating hole is provided on the device body, and the second pressure guiding port is communicated with the output end of the cavity; or, the rotating shaft is provided on the device body, the first pressure guiding port is communicated with the output end of the cavity, the rotating hole is provided on the instrument connection portion, and the second pressure guiding port is communicated with the first pressure interface.

13. The pressure calibration device according to claim 1, characterized in that, A variable-volume pressure regulating cavity is formed inside the first hand-held portion, and the pressure regulating cavity is communicated with the output end of the cavity to adjust the pressure of the pressure transmission medium output from the piston cylinder.

14. The pressure calibration device according to claim 13, characterized in that, It further includes: A pressure regulating piston movably provided in the pressure regulating cavity to adjust the volume of the pressure regulating cavity; A pressure regulating rod for driving the pressure regulating piston, one end of the pressure regulating rod is connected to the pressure regulating piston, and the other end of the pressure regulating rod extends out of the first hand-held portion for easy manual control of the pressure regulating rod.

15. The pressure calibration device according to claim 1, wherein, The device body further includes a liquid storage cavity, the input end of the cavity is communicated with the liquid storage cavity to supply a liquid pressure transmission medium to the piston cylinder through the liquid storage cavity, and the liquid storage cavity is provided between the piston cylinder and the instrument interface, such that when holding the first hand-held portion and the second hand-held portion with both hands, the position of the liquid storage cavity is higher than the position of the piston cylinder.

16. The pressure calibration device according to claim 15, characterized in that An exhaust circuit is provided inside the device body, one end of the exhaust circuit is communicated with the liquid storage cavity, the other end of the exhaust circuit is communicated with the output end of the cavity, and a first stop valve is provided on the exhaust circuit, and the first stop valve is used to control the on-off of the exhaust circuit.

17. The pressure calibration device according to claim 1, characterized in that a pressure relief port communicating with the instrument interface is provided on the device body, and a second stop valve is provided on the pressure relief port to control the opening and closing of the pressure relief port; and / or, the instrument interface further includes a second pressure interface provided on the device body, and the second pressure interface is used to be connected to a second pressure instrument through an external pipeline.

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