Fluid conveying coupling device

Abstract

The utility model discloses a fluid conveying coupling device, which comprises a socket and a plug, and further comprises a locking structure used for keeping the socket and the plug in a butt joint state, and the locking structure comprises a sliding seat, a first pressure spring, a limiting body and a limiting ring; the extension part comprises a limiting part and a first locking part, and the plug comprises a second locking part; when the socket and the plug are in a butt joint state and the sliding seat is in a locking state, the second locking part is arranged in the accommodating cavity, the sliding seat limits the limiting body to move outwards in the radial direction, and the limiting body is axially clamped with the first locking part and the second locking part at the same time; when the sliding seat is in an unlocking state, the limiting body allows radial outward movement, and the plug can be separated from the socket. According to the fluid conveying coupling device, axial fixation of the fluid conveying coupling device and the fluid conveying coupling device can be achieved only in an inserting and locking mode, locking between the fluid conveying coupling device and the fluid conveying coupling device can be rapidly relieved through the sliding base, dismounting and mounting are convenient, and the sliding base is not prone to loosening under the action of the first compression spring and is high in vibration resistance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical conveying, especially a fluid conveying coupling device. BACKGROUND

[0002] In the field of petrochemical and hazardous chemical conveying, the sealing safety and operation efficiency of the fluid conveying system have a decisive influence on production safety and operation efficiency. As a key interface component of the conveying pipeline, the reliability of the quick connector directly determines the stable operation of the system under high pressure, corrosive medium and complex working conditions. The traditional liquid connector generally adopts a sealing scheme of outer thread and nut rotation, and realizes axial compression and sealing surface fitting through multiple rotations. Although such structure can meet the basic sealing requirements in static environment, it exposes significant technical bottlenecks in actual industrial application.

[0003] Firstly, the operation complexity of threaded connection becomes the core problem restricting the operation efficiency. In the scene of frequent disassembly and assembly in petrochemical industry, the operator needs to repeatedly screw the nut to realize connection and separation, and the time consumption of single operation is as long as dozens of seconds, which seriously affects the timeliness of emergency response in high-risk environment.

[0004] Secondly, the structural stability defect of the existing connector under dynamic working condition. The petrochemical device is often in a high-intensity vibration environment (such as pump valve start-stop and pipeline pulsation), and the threaded pair is prone to stress relaxation under alternating load, resulting in pre-tightening force attenuation.

[0005] Therefore, it is urgent to develop a fluid conveying coupling device with the characteristics of quick plugging and dynamic locking, which fundamentally breaks through the technical limitations of traditional threaded connection to meet the dual needs of high-efficiency operation and intrinsic safety in high-risk industries such as petrochemical industry. INVENTION CONTENTS

[0006] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a fluid conveying coupling device, which solves the problems of operation complexity and weak vibration resistance of the liquid connector in the prior art.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A fluid conveying coupling device, comprising a socket and a plug, the socket comprising a body and an extension part extending axially from the body, a first flow channel is formed inside the body, and a receiving cavity is formed in the extension part; the plug forms a second flow channel inside, when the socket and the plug are in the state of butt joint, the plug is at least partially located in the receiving cavity, and the first flow channel and the second flow channel are communicated;

[0009] The locking structure comprises a sliding seat, a first compression spring, a limiting body and a limiting ring;

[0010] The extension part comprises a limiting part and a first locking part, and the plug comprises a second locking part;

[0011] The limiting ring is movably clamped with the limiting part, the sliding seat is axially movably sleeved on the outer periphery of the extension part, and the first compression spring is sleeved on the outer periphery of the extension part and abuts against the socket and the sliding seat at two ends, so that the sliding seat can abut against the limiting ring under the action of the first compression spring and be in a locked state; the sliding seat also has an unlocked state axially away from the limiting ring;

[0012] When the socket and the plug are in the butt joint state and the sliding seat is in the locked state, the second locking part is placed in the accommodating cavity, the limiting body is limited to move radially outward, and the limiting body is axially clamped with the first locking part and the second locking part at the same time;

[0013] When the sliding seat is in the unlocked state, the limiting body is allowed to move radially outward, and the plug can be separated from the socket.

[0014] The fluid conveying coupling device of the utility model realizes the locking of the socket and the plug in the butt joint state through the locking structure, the sliding seat in the locking structure has a locked state and an unlocked state, and can quickly switch between the two states; based on the sliding seat in the locked state, the limiting body can clamp the first locking part and the second locking part at the same time, so that the stable connection of the socket and the plug is realized, and the two are prevented from being separated along the axial direction; when necessary, the sliding seat is quickly switched to the unlocked state, the limiting body loses the limiting effect and can move radially outward, cannot clamp the first locking part and the second locking part at the same time, the plug can be separated from the socket, and the butt joint state is released. The fluid conveying coupling device of the utility model embodiment, the socket and the plug do not need to be threadedly matched, do not need to be locked by an additional nut, and the axial fixation of the two can be realized only by the plug-in and locking mode, the locking between the two can be quickly released by the sliding seat, the socket and the plug are convenient to disassemble and install, time and labor are saved, and the working efficiency is improved; and the sliding seat is not easy to loosen under the action of the first compression spring, the corresponding limiting part can also keep stable clamping, the anti-vibration ability is strong, the socket and the plug are not easy to loosen under the influence of vibration, and the sealing performance is good.

[0015] Preferably, the limiting part comprises a plurality of first limiting protrusions arranged at intervals in the circumferential direction, adjacent first limiting protrusions have a gap for insertion, the limiting ring comprises a second limiting protrusion on the radially inner side, the second limiting protrusion can pass through the gap for insertion, and the second limiting protrusion can abut against the first limiting protrusion to realize the movable clamping with the limiting part.

[0016] In order to make the limiting ring limit the sliding seat, the maximum outer diameter of the limiting ring is greater than the minimum inner diameter of the sliding seat, so that the sliding seat can be in abutment with the limiting ring under the action of the first compression spring and be in a locked state; thus, when the sliding seat is installed, the sliding seat needs to be sleeved on the extension part first, and then the limiting ring is movably connected with the limiting part; specifically, the second limiting protrusion on the radial inner side of the limiting ring is inserted through the insertion gap between the first limiting protrusions, and then the limiting ring is rotated, so that the second limiting protrusion abuts against the first limiting protrusion, and the limiting ring is connected on the limiting part, the force of the sliding seat on the limiting ring is further transmitted to the limiting part, and the stability of abutment is ensured, that is, the stability of the sliding seat in the locked state is ensured.

[0017] Preferably, the limiting part further comprises an accommodation gap on the axial inner side of the first limiting protrusion, the accommodation gap is an annular groove on the outer wall of the extension part, and is in communication with the insertion gap; the second limiting protrusion is rotated in the accommodation gap and abuts against the first limiting protrusion by rotating the limiting ring.

[0018] The axial inner side means that the accommodation gap is closer to the body of the socket than the first limiting protrusion; the accommodation gap is used for axially positioning the limiting ring, one axial side of the limiting ring abuts against the side wall of the accommodation gap, and the other axial side abuts against the first limiting protrusion; thus, even if the limiting ring does not abut against the sliding seat, the position of the limiting ring in the axial direction of the limiting part can be maintained, the shaking of the limiting ring is reduced, the limiting ring is prevented from being accidentally rotated and then separated from the limiting part, and thus the stability of the sliding seat when abutting against the limiting ring is ensured.

[0019] Preferably, a blocking part protruding from the bottom wall of the accommodation gap is arranged in the accommodation gap, and the blocking part is used for limiting the rotation angle of the limiting ring; so that the limiting ring is kept in the state that the first limiting protrusion and the second limiting protrusion abut against each other, and the stability of the limiting ring is further ensured.

[0020] Preferably, in the locked state, the limiting ring is located on the radial inner side of the sliding seat; the limiting ring comprises a first abutment surface, the first abutment surface is used for abutting against the opening of the sliding seat to limit the movement of the sliding seat away from the first flow channel, and the first abutment surface cooperates with the first compression spring to keep the sliding seat in the locked state.

[0021] The exposure of the limiting ring is easy to cause the rotation of the limiting ring due to the accidental touch, and then the limiting ring is separated from the limiting part, so that the sliding seat cannot be kept in the locked state. Therefore, when the sliding seat is in the locked state, the limiting ring is located at the radial inner side of the sliding seat, the exposure of the limiting ring is avoided, the limiting ring is protected, and the stability of the limiting ring is improved. Thus, the limiting ring located at the radial inner side of the sliding seat is abutted against the inner wall of the opening of the sliding seat through the first abutting surface, and is cooperated with the first compression spring to keep the sliding seat in the locked state.

[0022] Preferably, the first abutting surface comprises a first inclined surface and a second inclined surface arranged in sequence along the axial direction, and the opening of the sliding seat comprises a third inclined surface and a fourth inclined surface arranged in sequence along the axial direction, when the first abutting surface is abutted against the opening of the sliding seat, the third inclined surface is correspondingly abutted against the first inclined surface, and the fourth inclined surface is correspondingly abutted against the second inclined surface.

[0023] The inclined surfaces of the first abutting surface and the opening of the sliding seat are arranged, which can increase the abutting area of the sliding seat and the limiting ring, and improve the abutting stability. On the other hand, the inclined surfaces can guide the radial position of the sliding seat, so that the axis of the sliding seat is coincided with the axis of the extending part as much as possible, the radial distance of the sliding seat to the plurality of limiting members arranged in the circumferential direction is basically consistent, so that all the limiting members are simultaneously axially clamped with the first locking part and the second locking part, the anti-vibration ability of the socket and the plug is improved, and the socket and the plug are not easy to be loosened due to vibration. In addition, the scheme that the abutting is realized by the two groups of inclined surfaces can increase the abutting area, and then reduce the local structure fatigue risk, and increase the service life of the sliding seat and the limiting ring.

[0024] Preferably, the limiting ring further comprises a second abutting surface axially opposite to the first abutting surface, and the outer periphery of the plug is provided with a first step, when the socket is connected with the plug, the second abutting surface is abutted against the first step.

[0025] The second abutting surface can further transmit the force of the sliding seat to the limiting ring to the plug, so that the limiting ring will not move even if the sliding seat exerts a larger force on the limiting ring under the action of the first compression spring, the stability of the sliding seat and the limiting ring when abutting is improved, and then the stability of the sliding seat in the locked state is ensured. In addition, the relative matching position of the plug and the socket can be realized by the abutment of the second abutting surface and the first step, and the best communication state of the first flow channel and the second flow channel is ensured.

[0026] Preferably, the limiting body is a sphere, when the sliding seat is in the unlocked state and the first compression spring is in the maximum compression amount in the coupling device, the diameter of the limiting body is greater than the gap size between the sliding seat and the first locking part.

[0027] The limiting body is a sphere, which is more flexible in clamping with the first locking part and the second locking part, and on the other hand, it is also easy to cause the limiting body to be more easily slipped out from between the first locking part and the sliding seat, so it is necessary to control the gap between the sliding seat and the first locking part. Specifically, when the sliding seat is in the unlocked state and the first compression spring is in the maximum compression amount, the opening of the sliding seat corresponds to the first locking part and is relatively close to the first locking part. At this time, the gap between the sliding seat and the first locking part is the largest, and the limiting body can move in the first locking part. If the diameter of the limiting body is greater than the gap size between the sliding seat and the first locking part, the limiting body will be partially located in the first locking part and partially located between the sliding seat and the first locking part, and cannot be pulled out.

[0028] Preferably, the sliding seat comprises a pressing head having a pressing surface limiting the radial outward movement of the limiting body, and the pressing head is close to the axial inner side wall surface and abuts against the first compression spring.

[0029] The first compression spring is located on the axial inner side of the pressing head, that is, relatively close to the body of the socket. The pressing head radially protrudes from the opening of the sliding seat. The pressing head functions in two aspects: on the one hand, it can exert a radial inward force on the limiting body at the locking position, so that the limiting body is kept in clamping with the first locking part and the second locking part; on the other hand, the pressing head forms an inner side wall surface for the first compression spring to abut against. The first compression spring exerts an axial force on the pressing head and the sliding seat through the axial inner side wall surface of the pressing head, so that it can be kept in the locked state.

[0030] Preferably, the limiting body is a sphere; the first locking part is a tapered through-hole structure with a radial outer side dimension greater than a radial inner side dimension, the first locking part is in communication with the accommodating cavity; wherein the radial inner side dimension of the first locking part is smaller than the diameter of the limiting body; the second locking part is a conical blind hole structure with a radial outer side dimension greater than a radial inner side dimension, the second locking part is not in communication with the second flow channel;

[0031] The pressing head is away from the first valve port side wall surface to form an operating surface for pushing the limiting body, and the operating surface is an inclined surface or an arc surface;

[0032] When the sliding seat is driven from the unlocked state to the locked state, the limiting body is simultaneously embedded in the first locking part and the second locking part and clamped with both under the action of the operating surface.

[0033] The limiting body is a sphere, which is more flexible in clamping with the first locking part and the second locking part. Correspondingly, the first locking part is a conical through-hole structure, so that the sphere is more easily radially moved in the first locking part, and the radial inner side size of the first locking part is smaller than the diameter of the limiting body, avoiding the limiting body from completely passing through the first locking part and falling into the second locking part. The second locking part is also a conical structure, and in order to avoid the second flow channel in the connecting plug, a blind hole structure is adopted. The conical second locking part can exert a radially outward force on the spherical limiting member when the plug moves relative to the socket, so as to make the limiting member leave the second locking part, and the plug and the socket are separated. In addition, when the operating surface on the pressing head is a bevel or an arc surface, it is adapted to the upper half of the spherical limiting member, and can exert a radially inward force on the limiting member to push the limiting member into the first locking part and the second limiting part, which is more labor-saving.

[0034] Preferably, the socket further comprises a first housing, a first valve core, a first fixed seat and a second compression spring, the first housing has a first flow channel and a first valve port located on the axial side of the first flow channel, the first fixed seat is fixedly arranged on the inner wall of the first housing, and the two ends of the second compression spring abut against the first fixed seat and the first valve core, respectively;

[0035] The plug comprises a second housing, a second valve core, a second fixed seat and a third compression spring, the second housing has a second flow channel and a second valve port located on the axial side of the second flow channel, the second fixed seat is fixedly arranged on the inner wall of the second housing, and the two ends of the third compression spring abut against the second fixed seat and the second valve core, respectively;

[0036] When the socket and the plug are in a non-docking state, the second compression spring abuts against the first valve core to block the first valve port, and the third compression spring abuts against the second valve core to block the second valve port;

[0037] When the socket and the plug are in a docking state, the first valve core and the second valve core abut against each other to open the first valve port and the second valve port, and then the first flow channel and the second flow channel are communicated.

[0038] The fluid conveying coupling device of the utility model, form the first flow channel of axial extension in the first casing of socket, form the second flow channel of axial extension in the second casing of plug, the opposite end of first casing and second casing has first valve port and second valve port respectively, and respectively utilize first valve core and second valve core to block up, to guarantee the leakproofness and cleanliness of first flow channel and second flow channel, wherein, utilize second compression spring to first valve core exert axial action, make it with first valve port sealed abutment, utilize third compression spring to second valve core exert axial action, make it with second valve port sealed abutment, when socket and the plug butt joint, first valve core and second valve core abut, and exert axial action to second compression spring and third compression spring, make first valve core axial movement open first valve port, second valve core axial movement open second valve port, the plug and socket are connected at the same time and lead through, reduced first flow channel, second flow channel and the intercommunication of outside, guaranteed the leakproofness of first flow channel and second flow channel.

[0039] Compared with the prior art, the utility model has at least the following beneficial effects:

[0040] The fluid conveying coupling device of the utility model realizes locking when the socket and the plug butt joint through the locking structure, the sliding seat in the locking structure has a locking state and an unlocking state, and can quickly switch between the two states; through the sliding seat in the locking state, the limiting body can simultaneously clamp the first locking part and the second locking part, thereby realizing stable connection of the socket and the plug and avoiding axial separation of the two; when necessary, the sliding seat is quickly switched to the unlocking state, the limiting body loses the limiting effect and can move radially outward, cannot simultaneously clamp the first locking part and the second locking part, and the plug can be separated from the socket to release the butt joint state. The fluid conveying coupling device of the utility model embodiment does not need to be threadedly connected between the socket and the plug, does not need an additional nut for locking, and can realize axial fixation of the two only through plug-in and locking, can quickly release the locking between the two through the sliding seat, is convenient to disassemble and assemble, saves time and effort, and is favorable to improving work efficiency; and the sliding seat is not easy to loosen under the action of the first compression spring, the corresponding limiting part can also maintain stable clamping, has strong anti-vibration capability, the socket and the plug are not easy to loosen due to vibration, and have good sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0042] Figure 1A structure schematic view of the fluid conveying coupling device of the embodiment of the present utility model;

[0043] Figure 2 An axial section schematic view of the fluid conveying coupling device of the embodiment of the present utility model;

[0044] Figure 3 An axial section schematic view of the socket of the embodiment of the present utility model, wherein the second compression spring abuts against the first valve core to block the first valve port;

[0045] Figure 4 An axial section schematic view of the socket and the locking structure of the embodiment of the present utility model, wherein the first valve port is in an open state;

[0046] Figure 5 A structure schematic view of the limiting ring of the embodiment of the present utility model;

[0047] Figure 6 A partial structure schematic view of the extension of the embodiment of the present utility model;

[0048] Figure 7 An axial section schematic view of the plug of the embodiment of the present utility model, wherein the third compression spring abuts against the second valve core to block the second valve port;

[0049] Figure 8 An axial section schematic view of the plug of the embodiment of the present utility model, wherein the second valve port is in an open state.

[0050] Explanation of reference signs

[0051] 10, socket; 11, first shell; 111, first flow channel; 112, first valve port; 113, second step; 12, first valve core; 13, first fixed seat; 14, second compression spring; 15, extension; 151, accommodating cavity; 152, limiting part; 1521, first limiting protrusion; 1522, insertion gap; 1523, accommodating gap; 1524, blocking part; 153, first locking part; 16, first sealing member; 17, first guide inclined surface;

[0052] 20, plug; 21, second shell; 211, second flow channel; 212, second valve port; 213, first step; 22, second valve core; 23, second fixed seat; 24, third compression spring; 25, second locking part; 26, second guide inclined surface;

[0053] 30, locking structure; 31, sliding seat; 311, third inclined surface; 312, fourth inclined surface; 313, pressing head; 3131, pressing surface; 3132, abutting surface; 3133, operation surface; 32, first compression spring; 33, limiting body; 34, limiting ring; 341, second limiting protrusion; 342, first abutting surface; 3421, first inclined surface; 3422, second inclined surface; 343, second abutting surface. DETAILED DESCRIPTION

[0054] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0055] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] As Figures 1 to 8As shown, the fluid conveying coupling device of the embodiment of the utility model includes socket 10 and plug 20, socket 10 includes body and extension 15 extending axially from the body, first flow channel 111 is formed inside the body, accommodating cavity 151 is formed in extension 15, second flow channel 211 is formed inside plug 20, when socket 10 and plug 20 are in the docking state, plug 20 is at least partially located in accommodating cavity 151, first flow channel 111 and second flow channel 211 are communicated, the function of accommodating cavity 151 is to accommodate part of plug 20 and realize sealing to the outer wall of plug 20, avoid that first flow channel 111 and second flow channel 211 communicated are communicated with the outside through accommodating cavity 151, and fluid is contaminated.

[0058] And the docking state of plug 20 and socket 10 will directly affect the sealing property of first flow channel 111 and second flow channel 211, therefore, the fluid conveying coupling device of the embodiment further includes locking structure 30 for keeping socket 10 and plug 20 in the docking state, locking structure 30 includes sliding seat 31, first compression spring 32, limiting body 33 and limiting ring 34, based on first compression spring 32 and limiting ring 34, sliding seat 31 has locking state and unlocking state and can quickly switch between the two states, which is more convenient and labor-saving, and improves the docking efficiency of plug 20 and socket 10.

[0059] Specifically, extension 15 includes limiting portion 152 and first locking portion 153, plug 20 includes second locking portion 25;Sliding seat 31 is axially movably sleeved on the outer periphery of extension 15, when socket 10 and plug 20 are in the docking state and sliding seat 31 is in the locking state, second locking portion 25 is placed in accommodating cavity 151, sliding seat 31 limits the outward radial movement of limiting body 33, limiting body 33 is axially clamped with first locking portion 153 and second locking portion 25 at the same time, thereby realizing the stable connection of socket 10 and plug 20, avoiding the axial separation of the two, and keeping first flow channel 111 and second flow channel 211 communicated;When sliding seat 31 is in the unlocking state, limiting body 33 loses the limiting effect and allows the outward radial movement, cannot simultaneously clamp first locking portion 153 and second locking portion 25, plug 20 can be separated from socket 10 and the docking state is released.

[0060] The fluid conveying coupling device of the embodiment of the utility model, socket 10 and plug 20 do not need to be threadedly matched, also do not need additional nut locking, only through the plug-in and locking mode can realize the axial fixation of the two, also can quickly release the locking between the two through sliding seat 31, which is convenient for dismounting and mounting, time-saving and labor-saving, and is conducive to improving work efficiency.

[0061] In the embodiment, the limiting ring 34 is movably connected with the limiting portion 152, and the first compression spring 32 is sleeved on the outer periphery of the extension portion 15 and abuts against the socket 10 and the sliding seat 31 at both ends, so that the sliding seat 31 can abut against the limiting ring 34 under the action of the first compression spring 32 and be in the locked state. The sliding seat 31 always has a tendency to move towards the limiting member under the action of the first compression spring 32, and thus is not easy to loosen. The corresponding limiting member can also provide a reaction force to the sliding seat 31, and the anti-vibration capability is strong. The socket 10 and the plug 20 are not easy to loosen under the influence of vibration, and have good sealing performance. The unlocking state of the sliding seat 31 is a state of axially moving away from the limiting ring 34. At this time, the first compression spring 32 is in a compressed state, and the sliding seat 31 can be quickly switched from the unlocking state to the locked state without additional operation.

[0062] In the embodiment, in order to enable the limiting ring 34 to limit the sliding seat 31, the maximum outer diameter of the limiting ring 34 is greater than the minimum inner diameter of the sliding seat 31, so that the sliding seat 31 can abut against the limiting ring 34 under the action of the first compression spring 32 and be in the locked state. This results in that the sliding seat 31 needs to be sleeved on the extension portion 15 first, and then the limiting ring 34 is movably connected with the limiting portion 152. Figure 5 and Figure 6 As shown in the figures, the limiting portion 152 includes a plurality of first limiting protrusions 1521 arranged in a circumferential direction at intervals, and the adjacent first limiting protrusions 1521 have an insertion gap 1522 therebetween. The limiting ring 34 includes a second limiting protrusion 341 located on the radially inner side. The second limiting protrusion 341 can pass through the insertion gap 1522 between the first limiting protrusions 1521. After the second limiting protrusion 341 on the radially inner side of the limiting ring 34 passes through the insertion gap 1522 between the first limiting protrusions 1521, the limiting ring 34 is rotated, so that the second limiting protrusion 341 abuts against the first limiting protrusion 1521, to realize the movable connection with the limiting portion 152. The force of the sliding seat 31 on the limiting ring 34 is further transmitted to the limiting portion 152, to ensure the stability of abutment, that is, the stability of the sliding seat 31 in the locked state.

[0063] As shown in the figures, the limiting portion 152 includes a plurality of first limiting protrusions 1521 arranged in a circumferential direction at intervals, and the adjacent first limiting protrusions 1521 have an insertion gap 1522 therebetween. The limiting ring 34 includes a second limiting protrusion 341 located on the radially inner side. The second limiting protrusion 341 can pass through the insertion gap 1522 between the first limiting protrusions 1521. After the second limiting protrusion 341 on the radially inner side of the limiting ring 34 passes through the insertion gap 1522 between the first limiting protrusions 1521, the limiting ring 34 is rotated, so that the second limiting protrusion 341 abuts against the first limiting protrusion 1521, to realize the movable connection with the limiting portion 152. The force of the sliding seat 31 on the limiting ring 34 is further transmitted to the limiting portion 152, to ensure the stability of abutment, that is, the stability of the sliding seat 31 in the locked state. Figure 3 and Figure 6As shown, the limiting portion 152 further comprises a receiving gap 1523 located axially inside the first limiting protrusion 1521, which means that the receiving gap 1523 is closer to the body of the socket 10 than the first limiting protrusion 1521; the receiving gap 1523 is an annular groove on the outer wall of the extension 15 and is in communication with the insertion gap 1522; rotating the limiting ring 34 so that the second limiting protrusion 341 rotates in the receiving gap 1523 and abuts against the first limiting protrusion 1521; the function of the receiving gap 1523 is to axially position the limiting ring 34, one axial side of the limiting ring 34 abuts against the side wall of the receiving gap 1523 and the other axial side abuts against the first limiting protrusion 1521; thus, even if the limiting ring 34 does not abut against the sliding seat 31, the position of the limiting ring 34 in the axial direction of the limiting portion 152 can be maintained, the shaking of the limiting ring 34 is reduced, the limiting ring 34 is prevented from being accidentally rotated and then separated from the limiting portion 152, so as to ensure the stability of the sliding seat 31 when abutting against the limiting ring 34.

[0064] As shown in FIG. 6, the limiting ring 34 comprises a first abutting surface 342, which is used to abut against the opening of the sliding seat 31 to limit the movement of the sliding seat 31 away from the first flow channel 111; the first abutting surface 342 cooperates with the first compression spring 32 to keep the sliding seat 31 in the locked state. Figure 3 As shown, the receiving gap 1523 is provided with a blocking portion 1524 protruding from the bottom wall thereof; the blocking portion 1524 can be a protrusion and is located in a circumferential position different from that of the first limiting protrusion 1521; the blocking portion 1524 can abut against the side surface of the second limiting protrusion 341 in the circumferential direction, so as to limit the rotation angle of the limiting ring 34; when the blocking portion 1524 abuts against the second limiting protrusion 341, the first limiting protrusion 1521 and the second limiting protrusion 341 abut against each other in the corresponding axial direction, so as to ensure the stability of the limiting ring 34.

[0065] In this embodiment, the limiting ring 34 is rotationally connected with the limiting portion 152, so in use, the rotation of the limiting ring 34 should be avoided as much as possible; therefore, in the locked state, the limiting ring 34 is located radially inside the sliding seat 31, so as to avoid the exposure of the limiting ring 34 and thus protect the limiting ring 34 and improve the stability of the limiting ring 34. Figure 2 As shown in FIG. 6, the limiting ring 34 comprises a first abutting surface 342, which is used to abut against the opening of the sliding seat 31 to limit the movement of the sliding seat 31 away from the first flow channel 111; the first abutting surface 342 cooperates with the first compression spring 32 to keep the sliding seat 31 in the locked state.

[0066] Further, as shown in FIG. 6, the limiting ring 34 comprises a second abutting surface 343, which is used to abut against the second flow channel 112 to limit the movement of the sliding seat 31 away from the second flow channel 112. Figure 2As shown, the first abutting surface 342 includes a first inclined surface 3421 and a second inclined surface 3422 arranged in sequence along the axial direction, and the opening of the sliding seat 31 includes a third inclined surface 311 and a fourth inclined surface 312 arranged in sequence along the axial direction, when the first abutting surface 342 abuts with the opening of the sliding seat 31, the third inclined surface 311 corresponds to the first inclined surface 3421 to abut, and the fourth inclined surface 312 corresponds to the second inclined surface 3422 to abut; the arrangement of the first abutting surface 342 and the inclined surfaces at the opening of the sliding seat 31 can increase the abutting area of the sliding seat 31 and the limiting ring 34, and improve the abutting stability; on the other hand, the inclined surfaces can guide the radial position of the sliding seat 31, so that the axis of the sliding seat 31 coincides with the axis of the extension part 15 as much as possible, and the radial distance of the sliding seat 31 to the plurality of limiting members arranged in the circumferential direction is basically consistent, thereby ensuring that all the limiting members are simultaneously axially clamped with the first locking part 153 and the second locking part 25, and improving the anti-vibration ability of the socket 10 and the plug 20, so that they are not easily loosened by vibration. In addition, the scheme of realizing abutment by two groups of inclined surfaces can increase the abutting area between the limiting ring 34 and the sliding seat 31, thereby reducing the risk of local structure fatigue and increasing the service life of the sliding seat 31 and the limiting ring 34.

[0067] As shown, Figure 2 part of the plug 20 is placed in the accommodating cavity 151, and a first step 213 is arranged on the outer wall outside the accommodating cavity 151, and the limiting ring 34 further includes a second abutting surface 343 axially opposite to the first abutting surface 342, and the second abutting surface 343 abuts with the first step 213 when the socket 10 and the plug 20 are connected; the second abutting surface 343 can further transmit the force of the sliding seat 31 to the limiting ring 34 to the plug 20, so that the limiting ring 34 will not move even if the sliding seat 31 exerts a larger force on the limiting ring 34 under the action of the first compression spring 32, thereby improving the stability of the sliding seat 31 and the limiting ring 34 when abutting, and further ensuring the stability of the sliding seat 31 in the locked state. As a preferred, the second abutting surface 343 is a radial extending plane, which abuts with the plane of the first step 213; in addition, by abutting the second abutting surface 343 with the first step 213, the relative matching position of the plug 10 and the socket 20 can be realized, and the optimal communication state of the first flow channel 111 and the second flow channel 211 is ensured.

[0068] As shown, Figure 3 and Figure 4As shown, the socket 10 further comprises a first housing 11, a first valve core 12, a first fixed seat 13 and a second compression spring 14, the first housing 11 has a first flow channel 111 and a first valve port 112 located on the axial side of the first flow channel 111, the first fixed seat 13 is fixedly arranged on the inner wall of the first housing 11, and the two ends of the second compression spring 14 abut against the first fixed seat 13 and the first valve core 12 respectively; an extension 15 is located on the first housing 11 and is located on the axial outer side of the first valve port 112, away from the first flow channel 111 relative to the first valve port 112; as shown Figure 3 As shown, when the first valve core 12 seals the first valve port 112 under the action of the second compression spring 14, the end of the first valve core 12 is located in the first valve port 112 or outside the first valve port 112 and is located in the accommodating cavity 151 of the extension 15; the first locking portion 153 is located on the axial outer side of the first valve core 12, the limiting portion 152 is located on the axial outer side of the first locking portion 153, and the first sealing member 16 is located in the accommodating cavity 151 and on the axial inner side of the first locking portion 153. Preferably, the first sealing member 16 is a sealing ring.

[0069] As shown Figure 7 and Figure 8 The plug 20 comprises a second housing 21, a second valve core 22, a second fixed seat 23 and a third compression spring 24, the second housing 21 has a second flow channel 211 and a second valve port 212 located on the axial side of the second flow channel 211, the second fixed seat 23 is fixedly arranged on the inner wall of the second housing 21, and the two ends of the third compression spring 24 abut against the second fixed seat 23 and the second valve core 22 respectively; when the third compression spring 24 abuts against the second valve core 22 to block the second valve port 212, the end of the second valve core 22 is located in the second valve port 212 or outside the second valve port 212.

[0070] The second compression spring 14 applies an axial force to the first valve core 12 to make it seal and abut against the first valve port 112, and the third compression spring 24 applies an axial force to the second valve core 22 to make it seal and abut against the second valve port 212; when the socket 10 and the plug 20 are in the docking state, the first valve core 12 and the second valve core 22 abut against each other and apply an axial force to the second compression spring 14 and the third compression spring 24, so that the first valve core 12 moves axially to open the first valve port 112, and the second valve core 22 moves axially to open the second valve port 212, the plug 20 and the socket 10 are connected at the same time, reducing the communication between the first flow channel 111, the second flow channel 211 and the outside, and ensuring the sealing of the first flow channel 111 and the second flow channel 211.

[0071] When the socket 10 and the plug 20 are connected, the first valve port 112 and the second valve port 212 abut axially, and the inner wall of the first sealing member 16 seals the extension 15 and the outer wall of the second housing 21. The limiting body 33, the first locking part 153 and the second locking part 25 are located on the axial side of the second valve port 212 away from the first valve port 112, so as to avoid the locking structure 30 interfering with the sealing between the socket 10 and the plug 20.

[0072] As a preferred option, such as Figure 2 As shown, the inner wall of the extension 15 is provided with a first guide slope 17, and the outer wall of the second housing 21 is provided with a second guide slope 26. The first guide slope 17 is located on the side of the first locking part 153 near the first valve port 112, and the second guide slope 26 is located on the side of the second locking part 25 near the second valve port 212. During the docking process of the socket 10 and the plug 20, the first guide slope 17 and the second guide slope 26 are opposite each other and play a guiding role.

[0073] In one specific embodiment, such as Figure 2 As shown, the limiting body 33 is a sphere; the first locking part 153 is a conical through-hole structure with a radial outer dimension larger than the radial inner dimension. The first locking part 153 is connected to the receiving cavity 151. A part of the limiting body 33 can pass through the first locking part 153 and enter the receiving cavity 151. The radial inner dimension of the first locking part 153 is smaller than the diameter of the limiting body 33 to prevent the limiting body 33 from completely passing through the first locking part 153 and falling into the second locking part 25. The second locking part 25 is a conical blind hole structure with a radial outer dimension larger than the radial inner dimension to prevent connection with the second flow channel 211 inside the plug 20, ensuring the sealing of the second flow channel 211. The conical second locking part 25 can apply a radially outward force to the spherical limiting member when the plug 20 moves relative to the socket 10, thereby causing the limiting member to leave the second locking part 25 and the plug 20 to separate from the socket 10.

[0074] In one specific embodiment, such as Figure 2As shown, the sliding seat 31 comprises a pressing head 313, the pressing head 313 has a pressing surface 3131 for limiting the radial outward movement of the limiting body 33, and the pressing head 313 abuts against the first compression spring 32 close to the axial inner side wall surface. The first compression spring 32 is located on the axial inner side of the pressing head 313, i.e. relatively close to the body of the socket 10 relative to the pressing head 313, and the pressing head 313 protrudes radially from the opening of the sliding seat 31. The outer wall of the socket 10 is provided with a second step 113, the sliding seat 31 is sleeved on the second step 113, and the first compression spring 32 is located between the second step 113 and the pressing head 313. The pressing head 313 has the following effects: on the one hand, it can exert a radial inward force on the limiting body 33 in the locked position, so that the limiting body 33 is kept in engagement with the first locking portion 153 and the second locking portion 25 at the same time; on the other hand, the pressing head 313 forms an inner side wall surface for the abutment of one end of the first compression spring 32, and the first compression spring 32 exerts an axial force on the pressing head 313 and the sliding seat 31 through the axial inner side wall surface of the pressing head 313, so that it can be kept in the locked state.

[0075] The pressing head 313 comprises an operating surface 3133 facing the opening, an abutting surface 3132 facing the first compression spring 32, and a pressing surface 3131 limiting the limiting member when the sliding seat 31 is in the locked state. As a preferred embodiment, the pressing surface 3131 can be an axially extending plane to exert a radial inward force on the limiting member; the abutting surface 3132 can be a radially extending plane to ensure smooth abutment of the first compression spring 32; and the operating surface 3133 is a bevel or arc surface that matches the upper half of the spherical limiting member and can exert a radial inward force on the limiting member to push the limiting member into the first locking portion 153 and the second limiting portion 152, which is more labor-saving.

[0076] In a specific embodiment, the limiting body 33 is a spherical body, which is more flexible in engagement with the first locking portion 153 and the second locking portion 25, but on the other hand, it is also easy to cause the limiting body 33 to slip out of the first locking portion 153 and the sliding seat 31. Therefore, it is necessary to control the gap between the sliding seat 31 and the first locking portion 153. Specifically, when the sliding seat 31 is in the unlocked state and the first compression spring 32 is in the maximum compression amount, the opening of the sliding seat 31 corresponds to the first locking portion 153 and is relatively close to the first locking portion 153. At this time, the gap between the sliding seat 31 and the first locking portion 153 is the largest, and the limiting body 33 can move in the first locking portion 153. If the diameter of the limiting body 33 is greater than the gap size between the sliding seat 31 and the first locking portion 153, the limiting body 33 will be partially located in the first locking portion 153 and partially located between the sliding seat 31 and the first locking portion 153, and cannot be removed.

[0077] Further, when the sliding seat 31 is in the unlocked state and the first compression spring 32 is in the maximum compression amount, the operating surface 3133 of the pressing head 313 of the sliding seat 31 is positioned corresponding to the first locking portion 153, and the maximum gap between the sliding seat 31 and the first locking portion 153 can correspond to the gap between the operating surface 3133 of the pressing head 313 of the sliding seat 31 and the first locking portion 153, or the gap between the opening of the sliding seat 31 and the first locking portion 153.

[0078] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A fluid transport coupling device, comprising a socket and a plug, the socket comprising a body and an extension extending axially from the body, the body having a first flow channel formed therein, the extension having a receiving cavity formed therein; the plug having a second flow channel formed therein, wherein when the socket and the plug are in a mating state, the plug is at least partially located in the receiving cavity, and the first flow channel and the second flow channel are in communication; characterized in that, It also includes a locking structure for keeping the socket and the plug in a mating state, the locking structure including a sliding seat, a first compression spring, a limiting body and a limiting ring; The extension includes a limiting part and a first locking part, and the plug includes a second locking part; The limiting ring is movably engaged with the limiting part, the sliding seat is axially movable and sleeved on the outer periphery of the extension, the first compression spring is sleeved on the outer periphery of the extension and its two ends abut against the socket and the sliding seat respectively, so that the sliding seat can abut against the limiting ring under the action of the first compression spring and be in a locked state; the sliding seat also has an unlocked state that is axially away from the limiting ring. When the socket and the plug are in a mating state and the sliding seat is in a locked state, the second locking part is placed in the receiving cavity, the sliding seat restricts the radial outward movement of the limiting body, and the limiting body is simultaneously axially engaged with the first locking part and the second locking part. When the sliding seat is in the unlocked state, the limiting body allows radial outward movement, and the plug can be separated from the socket.

2. The fluid transport coupling device as described in claim 1, characterized in that, The limiting part includes a plurality of first limiting protrusions spaced circumferentially, with an insertion gap between adjacent first limiting protrusions. The limiting ring includes a second limiting protrusion located radially inside. The second limiting protrusion can pass through the insertion gap and abut against the first limiting protrusion to achieve a movable engagement with the limiting part.

3. The fluid transport coupling device as described in claim 2, characterized in that, The limiting part also includes a receiving gap located on the axial inner side of the first limiting protrusion. The receiving gap is an annular groove on the outer wall of the extension and communicates with the insertion gap. Rotating the limiting ring causes the second limiting protrusion to rotate in the receiving gap and abut against the first limiting protrusion.

4. The fluid transport coupling device as described in claim 3, characterized in that, The accommodating gap is provided with a blocking part protruding from its bottom wall, which is used to limit the rotation angle of the limiting ring.

5. The fluid transport coupling device as described in claim 1, characterized in that, In the locked state, the limiting ring is located radially inside the sliding seat; the limiting ring includes a first abutting surface, which abuts against the opening of the sliding seat to restrict the sliding seat from moving away from the first flow channel. The first abutting surface cooperates with the first compression spring to keep the sliding seat in the locked state.

6. The fluid transport coupling device as described in claim 5, characterized in that, The first abutting surface includes a first inclined surface and a second inclined surface arranged sequentially along the axial direction. The opening of the sliding seat includes a third inclined surface and a fourth inclined surface arranged sequentially along the axial direction. When the first abutting surface abuts against the opening of the sliding seat, the third inclined surface abuts against the first inclined surface, and the fourth inclined surface abuts against the second inclined surface. And / or, the limiting ring further includes a second abutting surface opposite to the axial direction of the first abutting surface. The outer periphery of the plug is provided with a first step. When the socket is connected to the plug, the second abutting surface abuts against the first step.

7. The fluid transport coupling device as described in claim 1, characterized in that, The limiting body is a sphere; when the sliding seat is in the unlocked state and the first compression spring is at its maximum compression in the coupling device, the diameter of the limiting body is greater than the gap between the sliding seat and the first locking part.

8. The fluid transport coupling device as described in claim 1, 6, or 7, characterized in that, The sliding seat includes a pressing head, which has a pressing surface that restricts the radial outward movement of the limiting body, and the pressing head abuts against the first compression spring near the axial inner wall surface.

9. The fluid transport coupling device as described in claim 8, characterized in that, The limiting body is a sphere; The first locking part is a tapered through-hole structure with a radial outer dimension larger than the radial inner dimension, and the first locking part is in communication with the receiving cavity; wherein, the radial inner dimension of the first locking part is smaller than the diameter of the limiting body; The second locking part is a conical blind hole structure with a radial outer dimension larger than the radial inner dimension, and the second locking part is not connected to the second flow channel; The pressing head forms an operating surface on the side wall away from the first valve port for pushing the limiting body, and the operating surface is a slope or an arc surface; When the sliding seat is driven from the unlocked state to the locked state, the limiting body simultaneously embeds the first locking part and the second locking part under the action of the operating surface and engages them.

10. The fluid transport coupling device as described in claim 1, 2, or 3, characterized in that, The socket further includes a first housing, a first valve core, a first fixing seat, and a second compression spring. The first housing has a first flow channel and a first valve port located on the axial side of the first flow channel. The first fixing seat is fixedly disposed on the inner wall of the first housing. The two ends of the second compression spring abut against the first fixing seat and the first valve core, respectively. The plug includes a second housing, a second valve core, a second fixing seat, and a third compression spring. The second housing has a second flow channel and a second valve port located on the axial side of the second flow channel. The second fixing seat is fixedly disposed on the inner wall of the second housing. The two ends of the third compression spring abut against the second fixing seat and the second valve core, respectively. When the socket and the plug are not in a mating state, the second spring abuts against the first valve core to block the first valve port; the third spring abuts against the second valve core to block the second valve port. When the socket and the plug are in a mating state, the first valve core and the second valve core abut against each other to open the first valve port and the second valve port, thereby connecting the first flow channel and the second flow channel.

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