CN218972097U

CN218972097U - Fluid connector

Info

Publication number: CN218972097U
Application number: CN202223296346.XU
Authority: CN
Inventors: 曾凡乐; 李长征; 李小强; 苏跃华
Original assignee: Beisit Electric Tech Hangzhou Co ltd
Current assignee: Beisit Electric Tech Hangzhou Co ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-05-05
Anticipated expiration: 2032-12-08

Abstract

The utility model discloses a fluid connector, and relates to the technical field of connectors. The fluid connector comprises a plug and a socket which are sequentially arranged along the front-back direction. The plug comprises a plug shell, wherein a first plug positioning ring and a second plug positioning ring are sequentially arranged on the outer peripheral surface of the plug shell from front to back, and a plug positioning groove is formed between the first plug positioning ring and the second plug positioning ring. The socket comprises a socket shell, a positioning block and a positioning elastic piece, wherein a socket positioning hole is formed in the socket shell, and the positioning block is movably arranged in the socket positioning hole. In the process that the plug is backwards plugged into the socket, the plug shell backwards stretches into the socket shell, the second plug positioning ring overcomes the elasticity of the positioning elastic piece and pushes the positioning block outwards, after the plug positioning groove passes through the front end face of the socket positioning hole, the positioning block enters the plug positioning groove under the pressure of the positioning elastic piece, and part of the structure is positioned in the socket positioning hole so as to lock the plug in the socket through the positioning block, thereby realizing self-locking of the connector and reliable connection.

Description

Fluid connector

Technical Field

The present disclosure relates to connectors, and particularly to a fluid connector.

Background

The existing fluid connector is characterized in that after a plug is connected with a socket, the plug and the socket are only spliced together, a locking structure is not provided, the plug is easy to separate from the socket, and the stability of connection is affected.

Therefore, how to improve the stability of the connection is a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the present utility model is directed to a fluid connector with better stability of plug and socket connection.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

a fluid connector includes a plug and a socket sequentially arranged in a front-rear direction; the plug comprises a plug shell, wherein a first plug positioning ring and a second plug positioning ring are sequentially arranged on the peripheral surface of the plug shell from front to back, and a plug positioning groove is formed between the first plug positioning ring and the second plug positioning ring; the socket comprises a socket shell, a positioning block and a positioning elastic piece, wherein a socket positioning hole is formed in the socket shell, and the positioning block is movably arranged in the socket positioning hole; in the process that the plug is backwards plugged into the socket, the plug shell backwards stretches into the socket shell, the second plug positioning ring overcomes the elasticity of the positioning elastic piece and pushes the positioning block outwards, after the plug positioning groove passes through the front end face of the socket positioning hole, the positioning block enters the plug positioning groove under the pressure of the positioning elastic piece, and part of the structure is located in the socket positioning hole so as to lock the plug in the socket through the positioning block.

Preferably, the socket positioning hole is arranged on the socket shell in a penetrating way; the socket further comprises a socket clamp ring which is sleeved outside the socket shell in a front-back sliding manner, and the socket clamp ring is arranged between the positioning elastic piece and the positioning block, so that the positioning elastic piece can press the positioning block through the socket clamp ring.

Preferably, the socket further comprises a push-pull elastic piece and a socket push-pull ring sleeved outside the socket shell, the push-pull elastic piece provides elasticity to press the socket push-pull ring forwards, a push-pull convex ring is arranged on the inner peripheral surface of the socket push-pull ring, and an avoidance groove is formed on the inner peripheral surface of the socket push-pull ring and positioned in front of the push-pull convex ring; when the positioning block locks the plug in the socket, the push-pull convex ring is positioned on the outer side of the positioning block, and after the socket push-pull ring moves backwards to the position where the avoidance groove is aligned with the positioning block against the elastic force of the push-pull elastic piece, the avoidance groove provides a space for the positioning block to move outwards and separate from the plug positioning groove.

Preferably, the socket clamp ring, the positioning elastic member and the push-pull elastic member are provided in a space between the socket housing and the socket push-pull ring.

Preferably, a fourth seal ring is provided on an inner circumferential surface of the socket housing so as to be sealingly connected between the inner circumferential surface of the socket housing and an outer circumferential surface of the plug housing in a state where the positioning block locks the plug to the socket.

Preferably, the plug further comprises a plug elastic member and a plug sealing rod which can be inserted into the plug shell in a front-back sliding way, and the socket further comprises a socket elastic member and a socket sealing rod which can be inserted into the socket shell in a front-back sliding way; in a state that the plug is separated from the socket, the plug elastic piece presses the plug sealing rod backwards so that the plug sealing rod is connected with the plug shell in a sealing mode, and the socket elastic piece presses the socket sealing rod forwards so that the socket sealing rod is connected with the socket shell in a sealing mode; in the process of plugging the plug into the socket, the plug sealing rod firstly pushes the socket sealing rod through the plug sealing rod to overcome the elastic force of the socket elastic piece, so that the socket sealing rod moves backwards in the socket shell to release the sealing between the socket sealing rod and the socket shell, and then the plug sealing rod is pushed to move forwards in the plug shell through the socket elastic piece by the socket sealing rod to release the sealing between the plug sealing rod and the plug shell, so that a communicating runner is formed in the plug shell and the socket shell.

Preferably, a plug connection table is arranged on the outer peripheral surface of the plug sealing rod in a protruding mode, and a third sealing ring is arranged on the outer peripheral surface of the plug connection table; a plug sealing table is arranged on the inner peripheral surface of the plug shell in a protruding manner; the plug sealing table is of a conical structure, and the rear end of the plug sealing table is a small-diameter end; and under the pressure of the plug elastic piece, the third sealing ring is tightly pressed between the plug connection table and the plug sealing table so as to be in sealing connection with the plug sealing rod on the plug shell.

Preferably, a socket connecting table is arranged on the outer peripheral surface of the socket sealing rod in a protruding mode, and a fifth sealing ring is arranged on the outer peripheral surface of the socket sealing table; a socket sealing table is arranged on the inner peripheral surface of the socket shell in a protruding way; the socket sealing table is of a conical structure, and the front end of the socket sealing table is a small-diameter end; and under the pressure of the socket elastic piece, the fifth sealing ring is tightly pressed between the socket connecting table and the socket sealing table so as to be in sealing connection with the socket sealing rod on the socket shell.

Preferably, the plug further comprises a plug base shell, the rear end of the plug base shell is sleeved outside the front end of the plug shell and is in sealing connection with the front end of the plug shell, and the inner space of the plug base shell is communicated with the inner space of the plug shell.

Preferably, the socket further comprises a socket base shell, the front end of the socket base shell is sleeved outside the rear end of the socket shell and is in sealing connection with the socket base shell, and the inner space of the socket base shell is communicated with the inner space of the socket shell.

The fluid connector provided by the utility model comprises plugs and sockets which are sequentially arranged along the front-back direction. The plug comprises a plug shell, wherein a first plug positioning ring and a second plug positioning ring are sequentially arranged on the outer peripheral surface of the plug shell from front to back, and a plug positioning groove is formed between the first plug positioning ring and the second plug positioning ring. The socket comprises a socket shell, a positioning block and a positioning elastic piece, wherein a socket positioning hole is formed in the socket shell, and the positioning block is movably arranged in the socket positioning hole.

In the process that the plug is backwards plugged into the socket, the plug shell backwards stretches into the socket shell, the second plug positioning ring overcomes the elasticity of the positioning elastic piece and pushes the positioning block outwards, after the plug positioning groove passes through the front end face of the socket positioning hole, the positioning block enters the plug positioning groove under the pressure of the positioning elastic piece, and part of the structure is positioned in the socket positioning hole so as to lock the plug in the socket through the positioning block. Therefore, after the plug is plugged into the socket, the plug can be locked through the positioning block, so that the plug cannot automatically separate from the socket, self-locking is realized, and connection is reliable.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a plug in a first embodiment of a fluid connector according to the present utility model;

FIG. 2 is a cross-sectional view of a receptacle of a first embodiment of a fluid connector according to the present utility model;

fig. 3 is a cross-sectional view of a first embodiment of a fluid connector according to the present utility model.

Reference numerals:

plug 1, plug housing 11, plug sealing stand 111, first plug positioning ring 112, second plug positioning ring 113, plug positioning groove 114, plug sealing rod 12, third seal ring 121, plug connection stand 122, plug support ring 13, plug base housing 14, first seal ring 141, second seal ring 142, connection screw 143, plug elastic member 15;

the socket 2, the socket housing 21, the socket sealing table 211, the socket positioning hole 212, the fourth sealing ring 213, the sixth sealing ring 214, the socket sealing rod 22, the fifth sealing ring 221, the socket connecting table 222, the socket supporting ring 23, the socket base housing 24, the socket elastic member 25, the socket compression ring 26, the positioning elastic member 261, the socket push-pull ring 27, the push-pull convex ring 271, the avoidance groove 272, the accommodation groove 273, the push-pull elastic member 274, and the positioning block 28.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The core of the utility model is to provide a fluid connector, which has better stability of plug and socket connection.

Referring to fig. 1 to 3, a fluid connector according to an embodiment of the present utility model includes a plug 1 and a socket 2 sequentially arranged along a front-rear direction.

The plug 1 includes a plug housing 11, a first plug positioning ring 112 and a second plug positioning ring 113 are provided in this order from front to back on the outer peripheral surface of the plug housing 11, and a plug positioning groove 114 is formed between the first plug positioning ring 112 and the second plug positioning ring 113.

The socket 2 includes a socket housing 21, a positioning block 28, and a positioning elastic member 261, a socket positioning hole 212 is provided on the socket housing 21, and the positioning block 28 is movably provided in the socket positioning hole 212, specifically, can move back and forth. The socket positioning hole 212 is specifically a waist-shaped hole extending along the plugging direction of the plug 1. The positioning block 28 is preferably a sphere, specifically a steel ball, which moves flexibly, and can also be a square block.

In a state where the plug 1 is separated from the receptacle 2, the positioning elastic member 261 presses the positioning block 28 forward against the front end surface of the receptacle positioning hole 212. In the process of plugging the plug 1 into the socket 2 backwards: the plug housing 11 extends back into the socket housing 21, the second plug positioning ring 113 overcomes the elastic force of the positioning elastic piece 261 to push the positioning block 28 outwards, after the plug positioning groove 114 passes through the front end face of the socket positioning hole 212, the positioning block 28 enters the plug positioning groove 114 under the pressure of the positioning elastic piece 261, and part of the positioning block 28 is positioned in the socket positioning hole 212, so that the plug 1 is locked in the socket 2 through the positioning block 28.

In this embodiment, after the plug 1 is plugged into the socket 2, the plug 1 can be locked by the positioning block 28, so that the plug 1 cannot automatically separate from the socket 2, thereby realizing self-locking and reliable connection.

Further, a socket positioning hole 212 is provided through the socket housing 21. The socket 2 further comprises a socket clamp ring 26 slidably sleeved outside the socket housing 21, and the socket clamp ring 26 is arranged between the positioning elastic member 261 and the positioning block 28, so that the positioning elastic member 261 can press the positioning block 28 through the socket clamp ring 26 and can apply stable thrust to the positioning block 28.

In addition, a plurality of socket positioning holes 212, for example, 8, may be provided on the socket housing 21 around the circumferential direction, one positioning block 28 is provided in each socket positioning hole 212, and all the positioning blocks 28 may be pushed forward uniformly by the socket clamp ring 26.

Further, the socket 2 further includes a push-pull elastic member 274 and a socket push-pull ring 27 sleeved outside the socket housing 21. The push-pull resilient member 274 provides a resilient force to urge the socket push tab 27 forward. The push-pull convex ring 271 is provided on the inner peripheral surface of the socket push-pull ring 27, and the escape groove 272 is formed on the inner peripheral surface of the socket push-pull ring 27 in front of the push-pull convex ring 271.

In a state that the positioning block 28 locks the plug 1 in the socket 2, as shown in fig. 3, the push-pull convex ring 271 is located at the outer side of the positioning block 28, and can specifically cooperate with the socket clamp ring 26 to press the positioning block 28 inwards, so as to prevent the positioning block 28 from being separated from the plug positioning groove 114 outwards.

When it is desired to remove the plug 1, the worker applies a rearward pulling force to the socket push-pull ring 27 so that the socket push-pull ring 27 can be moved rearward against the elastic force of the push-pull elastic member 274. After the socket push pull ring 27 moves backward against the elastic force of the push-pull elastic member 274 until the dodging groove 272 is aligned with the positioning block 28, the dodging groove 272 provides a space for the positioning block 28 to move outward and depart from the plug positioning groove 114. At this time, the plug 1 is pulled forward, and since the positioning block 28 has a movable space outwards, the positioning block 28 can move outwards to be separated from the plug positioning groove 114, the plug 1 can be separated from the socket 2, the plug 1 and the socket 2 can be detached, and the operation is convenient.

In addition, a receiving groove 273 is provided on the inner peripheral surface of the socket 2 at the rear side of the push-pull collar 271 to facilitate the installation of the plug 1. During the process of plugging the plug housing 11 into the socket 2, the second plug positioning ring 113 overcomes the elastic force of the positioning elastic member 261, pushes the positioning block 28 outwards into the accommodating groove 273, and then the positioning block 28 enters the plug positioning groove 114 through the accommodating groove 273 to realize locking. Preferably, the plug positioning groove 114 is a trapezoid groove, the push-pull convex ring 271 is a trapezoid bulge, and the positioning block 28 is guided by an inclined plane so as to make tilting movement, so that the displacement resistance of the positioning block 28 can be reduced.

Further, the socket clamp ring 26, the positioning elastic member 261 and the push-pull elastic member 274 are provided in the space between the socket housing 21 and the socket push-pull ring 27, which can make the apparatus compact. Wherein, a boss can be arranged in the middle of the socket push-pull ring 27 in a protruding way, the rear end of the positioning elastic piece 261 is propped against the boss, and the front end of the push-pull elastic piece 274 is propped against the boss, so that the elastic piece can implement corresponding elasticity by virtue of the boss.

Of course, in other embodiments, the positioning block 28 may also move inside and outside in the socket positioning hole 212, and accordingly, the positioning elastic member 261 is disposed outside the positioning block 28 to provide elastic force to the positioning block 28.

Further, the fourth seal ring 213 is provided on the inner peripheral surface of the socket housing 21 so as to be sealingly connected between the inner peripheral surface of the socket housing 21 and the outer peripheral surface of the plug housing 11 in a state where the plug 1 is locked to the socket 2 by the positioning block 28, and sealability between the two can be ensured.

Further, the plug 1 further includes a plug elastic member 15 and a plug seal rod 12 slidably inserted in the plug housing 11 back and forth. The socket 2 further includes a socket elastic member 25 and a socket sealing rod 22 slidably inserted in the socket housing 21 back and forth.

In a state where the plug 1 is separated from the socket 2, the plug elastic member 15 presses the plug seal lever 12 rearward so that the plug seal lever 12 is sealingly connected to the plug housing 11; the socket elastic member 25 presses the socket sealing bar 22 forward so that the socket sealing bar 22 is sealingly connected to the socket housing 21. Wherein, in this application, the elastic component is the spring, and the sealing washer is O type circle.

In the process of plugging the plug 1 into the socket 2: in the state that the plug sealing rod 12 is just contacted with the socket sealing rod 22, the elasticity of the socket elastic piece 25 is smaller than the elasticity of the plug elastic piece 15, the socket sealing rod 22 moves backwards in the socket shell 21 by the thrust of the plug sealing rod 12 to the socket sealing rod 22 and overcomes the elasticity of the socket elastic piece 25, so that the sealing between the socket sealing rod 22 and the socket shell 21 is released, and along with the backward movement of the plug sealing rod 12, the socket sealing rod 22 is extruded and the deformation degree is increased, the elasticity of the socket elastic piece 25 is also increased continuously, and when the elasticity of the socket sealing rod is larger than the elasticity of the plug elastic piece 15, the socket elastic piece 25 presses the plug sealing rod 12 through the socket sealing rod 22 to enable the plug sealing rod 12 to move forwards in the plug shell 11, so that the sealing rod 12 and the plug shell 11 are also released, a communicating flow channel is automatically formed between the plug 1 and the socket 2 in the process of plugging the plug 1 into the socket 2, and the operation is convenient.

In this embodiment, the plug 1 and the socket 2 are in a needle valve type sealing opening and closing structure, and can be cut off and opened by moving the sealing rod in the corresponding housing, so that the sealing performance can be prevented from being influenced by fluid impurities, and the fluid connector forms a needle valve type fluid connector.

Further, a plug connection stand 122 is provided on the outer peripheral surface of the plug seal rod 12 in a protruding manner, and a third seal ring 121 is provided on the outer peripheral surface of the plug connection stand 122. A plug seal block 111 is provided on the inner peripheral surface of the plug housing 11. The plug seal stage 111 has a tapered structure, and the rear end thereof is a small diameter end. The third seal ring 121 is sealingly compressed between the plug connection stage 122 and the plug seal stage 111 under the pressure of the plug elastic member 15 to sealingly connect the plug seal rod 12 to the plug housing 11. The conical surface is adopted for arrangement, and the sealing is reliable. In other embodiments, the plug sealing base 111 may be pressed by a plane perpendicular to the front-rear direction in cooperation with the third seal ring 121.

Further, a socket connection stage 222 is provided on the outer peripheral surface of the socket sealing rod 22 in a protruding manner, and a fifth seal ring 221 is provided on the outer peripheral surface of the socket sealing stage 211. A socket sealing stage 211 is provided protruding from the inner peripheral surface of the socket housing 21. The socket sealing stage 211 has a tapered structure, and a small diameter end at the front end thereof. The fifth seal ring 221 is sealingly compressed between the socket connecting stage 222 and the socket sealing stage 211 under the pressure of the socket elastic member 25 to sealingly connect the socket sealing rod 22 to the socket housing 21. The conical surface is adopted for arrangement, and the sealing is reliable. In other embodiments, the socket sealing platform 211 may also be pressed by being matched with the fifth sealing ring 221 by a plane perpendicular to the front-rear direction.

Further, the plug 1 further comprises a plug base housing 14, wherein the rear end of the plug base housing 14 is sleeved outside the front end of the plug housing 11 and is in sealing connection, and the inner space of the plug base housing 14 is communicated with the inner space of the plug housing 11, so that the plug 1 can be conveniently connected to a customer mounting plate through the plug base housing 14.

Wherein, plug base shell 14 front end outer peripheral face sets up connecting screw thread 143, with customer's mounting panel threaded connection, convenient operation. In addition, the outer peripheral surface of the plug base housing 14 is provided with a first seal ring 141 to achieve sealing when connected to the customer mounting plate. The plug base housing 14 and the plug housing 11 can be connected by screw threads and sealed by a second sealing ring 142.

In addition, the plug 1 further comprises a plug support ring 13, the plug support ring 13 is fixed at the front end of the plug housing 11 and is positioned inside the plug base housing 14, the plug seal rod 12 is inserted into the inner hole of the plug support ring 13 after passing through the plug elastic member 15, the plug support ring 13 can restrict the movement range of the plug seal rod 12 within a certain range, and in addition, fluid in the plug base housing 14 can enter the plug housing 11 through the through hole on the plug support ring 13. Furthermore, the plug spring 15 can abut between the plug support ring 13 and the plug connection stage 122.

Further, the socket 2 further comprises a socket base housing 24, the front end of the socket base housing 24 is sleeved outside the rear end of the socket housing 21 and is in sealing connection, the inner space of the socket base housing 24 is communicated with the inner space of the socket housing 21, and the socket 2 can be connected with a client hose through the socket base housing 24. Optionally, the rear end of the socket base housing 24 is provided with a pagoda interface to connect customer hoses. Wherein, the socket base housing 24 and the socket housing 21 can be connected by screw threads, and sealing is realized by a sixth sealing ring 214.

In addition, the socket 2 further includes a socket support ring 23, the socket support ring 23 is fixed at the rear end of the socket housing 21 and is located inside the socket base housing 24, the socket seal rod 22 is inserted into the inner hole of the socket support ring 23 after passing through the socket elastic member 25, the socket support ring 23 can restrict the movement range of the socket seal rod 22 within a certain range, and in addition, the fluid in the socket housing 21 can enter the socket base housing 24 through the through hole in the socket support ring 23. Furthermore, the socket elastic member 25 may abut between the socket support ring 23 and the socket connection stage 222.

The fluid connector in this embodiment, the working principle includes:

when the plug 1 is inserted into the socket 2 backwards, the rear end of the plug sealing rod 12 contacts with the front end of the socket sealing rod 22, because the elasticity designed by the socket elastic piece 25 is smaller than that of the plug elastic piece 15, the plug sealing rod 12 pushes the socket sealing rod 22 to move backwards, the needle valve type socket 2 is opened, and after the elasticity of the socket elastic piece 25 exceeds that of the plug elastic piece 15 as the plug 1 is continuously inserted into the socket 2, the needle valve type plug 1 is opened, and as shown in fig. 3, fluid flows through the inner cavity of the connector along the arrow direction in the fluid connector; meanwhile, in the moving process of the plug 1, after the second plug positioning ring 113 on the plug housing 11 touches the positioning block 28, the positioning block 28 is pushed to move backwards and avoid the push-pull convex ring 271 of the socket push-pull ring 27, the positioning block 28 moves to the outer circle to enter the accommodating groove 273, when the plug 1 moves to the position alignment of the plug positioning groove 114 and the positioning block 28, the positioning block 28 falls into the plug positioning groove 114, the socket pressing ring 26 pushes the positioning block 28 forwards to return to the original position under the action of the positioning elastic piece 261, and the locking of the plug 1 and the socket 2 is realized through the cooperation of the positioning block 28, the plug positioning groove 114 and the socket positioning hole 212.

The fluid connector in the embodiment can directly and automatically realize locking in the process of inserting the plug 1 into the socket 2, is convenient and quick to lock, is reliable in connection, and can improve the service efficiency of products; the plug 1 and the socket are in a needle valve structure, and in a separation state, the plug 1 and the socket 2 are respectively sealed, so that the influence of fluid impurities on the sealing performance can be prevented; the sealing rod and the corresponding shell are sealed by conical surfaces, so that the sealing rod can bear high pressure; the connector has simple structure and can reduce cost.

It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality", "a plurality of groups" is two or more.

The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The fluid connector provided by the utility model is described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims

1. A fluid connector, characterized by comprising a plug (1) and a socket (2) which are sequentially arranged along the front-rear direction;

the plug (1) comprises a plug shell (11), a first plug positioning ring (112) and a second plug positioning ring (113) are sequentially arranged on the peripheral surface of the plug shell (11) from front to back, and a plug positioning groove (114) is formed between the first plug positioning ring (112) and the second plug positioning ring (113);

the socket (2) comprises a socket shell (21), a positioning block (28) and a positioning elastic piece (261), wherein a socket positioning hole (212) is formed in the socket shell (21), and the positioning block (28) is movably arranged in the socket positioning hole (212);

in the process that the plug (1) is backwards plugged into the socket (2), the plug shell (11) backwards stretches into the socket shell (21), the second plug locating ring (113) overcomes the elastic force of the locating elastic piece (261) and pushes the locating piece (28) outwards, after the plug locating groove (114) passes through the front end face of the socket locating hole (212), part of the locating piece (28) enters the plug locating groove (114) under the pressure of the locating elastic piece (261), and the other part of the structure is located in the socket locating hole (212) so as to lock the plug (1) in the socket (2) through the locating piece (28).

2. The fluid connector of claim 1, wherein the socket positioning holes (212) are provided through the socket housing (21); the socket (2) further comprises a socket clamp ring (26) which is sleeved outside the socket shell (21) in a sliding mode, and the socket clamp ring (26) is arranged between the positioning elastic piece (261) and the positioning block (28), so that the positioning elastic piece (261) can press the positioning block (28) through the socket clamp ring (26).

3. The fluid connector according to claim 2, wherein the socket (2) further comprises a push-pull elastic member (274) and a socket push-pull ring (27) sleeved outside the socket housing (21), the push-pull elastic member (274) provides an elastic force to push the socket push-pull ring (27) forward, a push-pull convex ring (271) is provided on an inner peripheral surface of the socket push-pull ring (27), and a relief groove (272) is formed on the inner peripheral surface of the socket push-pull ring (27) in front of the push-pull convex ring (271);

when the positioning block (28) locks the plug (1) in the socket (2), the push-pull convex ring (271) is positioned at the outer side of the positioning block (28), and after the socket push-pull ring (27) moves backwards against the elastic force of the push-pull elastic piece (274) until the avoidance groove (272) is aligned with the positioning block (28), the avoidance groove (272) provides a space for the positioning block (28) to move outwards and separate from the plug positioning groove (114).

4. A fluid connector according to claim 3, characterized in that the socket clamp ring (26), the positioning spring (261) and the push-pull spring (274) are provided in a space between the socket housing (21) and the socket push-pull ring (27).

5. The fluid connector according to claim 1, wherein a fourth seal ring (213) is provided on an inner peripheral surface of the socket housing (21) so as to be sealingly connected between the inner peripheral surface of the socket housing (21) and an outer peripheral surface of the plug housing (11) in a state where the positioning block (28) locks the plug (1) to the socket (2).

6. The fluid connector according to any one of claims 1 to 5, wherein the plug (1) further comprises a plug elastic member (15) and a plug seal rod (12) slidably inserted in the plug housing (11) back and forth, and the socket (2) further comprises a socket elastic member (25) and a socket seal rod (22) slidably inserted in the socket housing (21) back and forth;

in a state that the plug (1) is separated from the socket (2), the plug elastic member (15) presses the plug sealing rod (12) backwards so that the plug sealing rod (12) is connected with the plug shell (11) in a sealing way, and the socket elastic member (25) presses the socket sealing rod (22) forwards so that the socket sealing rod (22) is connected with the socket shell (21) in a sealing way;

in the process of plugging the plug (1) into the socket (2), the plug sealing rod (12) pushes the plug sealing rod (22) forward in the plug housing (11) firstly to overcome the elastic force of the socket elastic piece (25), so that the plug sealing rod (22) moves backward in the socket housing (21) to release the sealing between the plug sealing rod (22) and the socket housing (21), and then the plug elastic piece (25) pushes the plug sealing rod (12) through the socket sealing rod (22) to move forward in the plug housing (11) to release the sealing between the plug sealing rod (12) and the plug housing (11), so that a communicating flow passage is formed in the plug housing (11) and the socket housing (21).

7. The fluid connector according to claim 6, wherein a plug connection stage (122) is provided on an outer peripheral surface of the plug sealing rod (12) in a protruding manner, and a third seal ring (121) is provided on an outer peripheral surface of the plug connection stage (122); a plug sealing table (111) is arranged on the inner peripheral surface of the plug shell (11) in a protruding mode; the plug sealing table (111) is of a conical structure, and the rear end of the plug sealing table is a small-diameter end; the third sealing ring (121) is tightly pressed between the plug connection table (122) and the plug sealing table (111) under the pressure of the plug elastic piece (15) so as to tightly connect the plug sealing rod (12) with the plug shell (11).

8. The fluid connector according to claim 6, wherein a socket connection stage (222) is provided on an outer peripheral surface of the socket sealing rod (22) in a protruding manner, and a fifth seal ring (221) is provided on an outer peripheral surface of the socket sealing stage (211); a socket sealing table (211) is arranged on the inner peripheral surface of the socket shell (21) in a protruding way; the socket sealing table (211) is of a conical structure, and the front end of the socket sealing table is a small-diameter end; the fifth sealing ring (221) is tightly pressed between the socket connecting table (222) and the socket sealing table (211) under the pressure of the socket elastic piece (25) so as to tightly connect the socket sealing rod (22) with the socket shell (21).

9. The fluid connector according to claim 6, wherein the plug (1) further comprises a plug base housing (14), the rear end of the plug base housing (14) is sleeved outside the front end of the plug housing (11) and is in sealing connection, and the inner space of the plug base housing (14) is communicated with the inner space of the plug housing (11).

10. The fluid connector according to claim 6, wherein the socket (2) further comprises a socket base housing (24), a front end of the socket base housing (24) is sleeved outside a rear end of the socket housing (21) and is connected in a sealing manner, and an inner space of the socket base housing (24) is communicated with an inner space of the socket housing (21).