CN216201475U

CN216201475U - Dry-type quick joint for hydrogen pipe bundle vehicle

Info

Publication number: CN216201475U
Application number: CN202121681498.4U
Authority: CN
Inventors: 程龙军; 陶彬; 蒲鹤; 王振中; 赵雯晴; 宫宏
Original assignee: China Petroleum and Chemical Corp; Sinopec Safety Engineering Research Institute Co Ltd
Current assignee: China Petroleum and Chemical Corp; Sinopec Safety Engineering Research Institute Co Ltd
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2022-04-05
Anticipated expiration: 2031-07-23

Abstract

The utility model provides a dry quick connector for a hydrogen tube bundle vehicle, which comprises: the male end comprises a male gun seat, a male gun head fixedly connected with the male gun seat and a single-phase valve core arranged in the male gun head; the female head end comprises a female head gun seat, a female head gun head fixedly connected with the female head gun seat, a female head gun sleeve arranged in the female head gun head and a fixed valve core arranged in the female head gun sleeve; wherein, under the first state, public head end and female head end all form and proclaim oneself, under the second state, aim at public head rifle head and laminate female head gun case, fixed case and the laminating of single-phase case terminal surface, fixed case and single-phase case can be for female head rifle head and public head rifle head axial motion to switch on the inside passage of public head end and female head end, in order to open dry-type quick-operation joint, first state and second state can switch, thereby accomplish the connecing into and breaking off of public head end and female head end.

Description

Dry-type quick joint for hydrogen pipe bundle vehicle

Technical Field

The utility model belongs to the technical field of gaseous fuel filling equipment, and particularly relates to a dry-type quick connector for a hydrogen tube bundle vehicle.

Background

In recent years, the hydrogen energy industry has been rapidly developing. With the rapid development of the hydrogen energy industry, the demand of hydrogen as a new clean energy is rapidly increasing. However, the existing hydrogen station has the problems of low hydrogen supply efficiency, unreasonable safety risk prevention and control measures, unsound safety technical specification system and the like.

The hydrogen is a colorless and tasteless gas, has the characteristics of low density, large diffusion coefficient, low ignition temperature, wide combustion and explosion range, high combustion flame speed and the like, and belongs to flammable and explosive gases. Moreover, hydrogen molecules are small and easily penetrate through metals and organic substances to cause leakage. Therefore, the problems of hydrogen leakage and explosion safety are very important in the application process of hydrogen energy.

As a large amount of high-pressure hydrogen is stored in the hydrogenation station, once leakage occurs, large-scale combustible gas cloud is easily formed, severe explosion accidents can be caused, and the personal and property safety is seriously threatened. The hydrogen supply of the hydrogen filling station is basically carried out in a tube bundle vehicle road transportation mode, the loading and unloading time of the hydrogen in the station is long, and the connection reliability of a tank truck and a loading and unloading pipeline determines the safety of the whole loading and unloading operation.

At present, the loading and unloading operation of a hydrogen tube bundle vehicle adopts a bolt connection mode, soapy water leakage detection is needed after the bolt connection is finished, once the bubbling and other problems occur, the leakage detection needs to be carried out again, a filling pipeline is blown after the leakage detection is qualified, the air in the pipeline is replaced by nitrogen, and the loading and unloading operation can be carried out after the air content reaches the standard. The filling pressure of the hydrogen tube bundle vehicle is 20MPa, once the leakage of hydrogen is detected in the process of loading and unloading the high-pressure hydrogen, the operation is stopped to check the leakage point at the joint, and the loading and unloading operation is carried out again after the leakage is detected to be qualified after fastening. The connection reliability of the connecting part for hydrogen loading and unloading operation determines the safety of the whole loading and unloading area, however, the traditional clamp steel ball locking structure adopts a point contact connection mode to realize the connection of a male head and a female head, and the connection reliability is insufficient under the condition of 20MPa high-pressure hydrogen conveying. Traditional bolted connection form operation is tedious, and threaded connection easily appears hydrogen and leaks, leads to its connection inefficiency, connects leakproofness level reliability poor. Therefore, a novel dry quick coupling for loading and unloading a hydrogen bundle vehicle is urgently needed for the loading and unloading working condition of hydrogen conveyed at low density and high pressure.

SUMMERY OF THE UTILITY MODEL

In view of the above technical problems, the present invention is directed to a dry quick connector for a hydrogen tube bundle vehicle, which can realize quick connection and separation of the hydrogen tube bundle vehicle and a hydrogen filling pipeline, improve connection reliability of a connection component, facilitate and quickly connection, and automatically reduce pressure, effectively prevent leakage accidents caused by accidental drop of the connector, effectively ensure safety of loading and unloading operations of the hydrogen tube bundle vehicle, and greatly facilitate improvement of reliability of overall connection of the loading and unloading operations.

To this end, according to the utility model, a dry quick coupling for a hydrogen bundle cart is provided, comprising: the male end comprises a male gun seat, a male gun head fixedly connected with the male gun seat and a single-phase valve core arranged in the male gun head; the female head end comprises a female head gun seat, a female head gun head fixedly connected with the female head gun seat, a female head gun sleeve arranged in the female head gun head and a fixed valve core arranged in the female head gun sleeve; in the first state, the male head end is plugged by the single-phase valve core to form self-sealing, the female head end is plugged by the fixed valve core to form self-sealing, in the second state, the female head sleeve is aligned to the male head end and is attached, the fixed valve core is attached to the end face of the single-phase valve core, the fixed valve core and the single-phase valve core can axially move relative to the female head sleeve and the male head end, so that the internal channels of the male head end and the female head end are conducted to open the dry-type quick connector, and the first state and the second state can be switched to complete connection and disconnection of the male head end and the female head end.

In one embodiment, the single-phase valve core is arranged in the male gun head through a male valve core seat which is constructed in a hollow structure and can move along the axial direction of the male gun head,

the single-phase valve core comprises a cylindrical main body and a first connecting rod connected with the cylindrical main body, a conical surface is formed at the joint of the first connecting rod and the cylindrical main body, and the single-phase valve core is fixedly connected with the male valve core seat through the first connecting rod.

In one embodiment, the inner wall of the male gun seat is provided with a first step, a first elastic member is arranged in the male gun seat, two ends of the first elastic member respectively abut against the first step and the male valve core seat, the outer surface of the cylindrical main body is provided with an annular bulge,

in a first state, under the action of a pretightening force provided by the first elastic piece, the single-phase valve core enables the annular bulge to abut against the inlet end of the male gun head to limit the single-phase valve core, so that the single-phase valve core blocks the inlet end of the male gun head, and the male head end forms a self-sealing function,

in a second state, the single-phase spool moves axially and compresses the first resilient member, thereby opening the inlet end of the male end.

In one embodiment, the female head end further comprises a fixed inner sleeve connected with the female head gun seat, a second step is arranged outside the fixed inner sleeve, the female head is fixedly connected with the outer wall surface of the fixed inner sleeve, the female head gun sleeve is arranged between the female head and the fixed inner sleeve in the radial direction, a second elastic piece is arranged between the female head gun sleeve and the second step, a first limiting shoulder is arranged on the inner wall of the female head, a first limiting step is arranged on the outer wall of the female head gun sleeve,

in a first state, the female gun sleeve enables the first limit step to abut against the first limit shoulder under the action of the second elastic piece, and enables the end surface of the female gun sleeve to be aligned with the valve core surface of the fixed valve core,

in a second state, the female holster is capable of moving axially by axially compressing the second resilient member.

In one embodiment, the fixed valve core is arranged inside the female end through a female valve core seat constructed in a hollow structure,

the fixed valve core is constructed to comprise a conical main body and a second connecting rod connected with the conical main body, and the fixed valve core is fixedly connected with the female valve core seat through the second connecting rod.

In one embodiment, the female end further comprises a cone-mouth inner sleeve inserted into the fixed inner sleeve, a third elastic member is arranged between the cone-mouth inner sleeve and the fixed inner sleeve,

in the first state, the cone is sleeved in the cone and tightly attached to the fixed valve core under the action of the third elastic piece so as to enable the female end to form a self-sealing,

in a second state, the female gun sleeve can drive the cone port inner sleeve to axially move and compress the third elastic piece, so that the cone port inner sleeve is separated from the fixed valve core to open the outlet end of the female head end.

In one embodiment, a limiting bulge is arranged on the outer wall of the conical opening inner sleeve, the third elastic piece is arranged between the limiting bulge and the end face of the fixed inner sleeve, a second limiting step is arranged on the inner wall of the female gun sleeve,

the female gun case is in contact with the limiting bulge through the second limiting step to drive the conical opening inner sleeve to axially move.

In one embodiment, a holding sleeve is sleeved outside the female head, a fourth elastic element is arranged between the holding sleeve and the female head,

the inner wall of the holding sleeve is provided with a third limiting step, the outer wall of the female gun head is provided with a second limiting shoulder, and two ends of the fourth elastic piece respectively abut against the first end face of the third limiting step and the second limiting shoulder.

In one embodiment, the first end of the female gun head is provided with a plurality of mounting holes which are uniformly distributed in the circumferential direction, positioning bayonet locks are respectively mounted in the mounting holes, a mounting groove is arranged on the outer wall of the male gun head close to the inlet end,

in the first state, under the action of the fourth elastic element and the positioning bayonet lock, the end surface of the holding sleeve is aligned with the valve core surface of the fixed valve core,

in a second state, the male gun head pushes the female gun sleeve to move axially and compress the second elastic part, so as to drive the conical opening inner sleeve to move axially and compress the third elastic part until the male gun head moves to enable the plurality of positioning clamping pins to fall into the mounting groove correspondingly, and the male gun head and the female gun sleeve are locked to form self-sealing.

In one embodiment, in the second state, an acting force can be applied to the grip sleeve to cause the grip sleeve to axially move, the plurality of positioning pins are configured to automatically bounce from the mounting groove of the male gun head when the grip sleeve moves to a position where the second end face of the third limiting step is located on the axial inner side of the mounting hole, so that the plurality of positioning pins can stop the grip sleeve again, and the male head end and the female head end form self-sealing simultaneously to complete disconnection, falling and self-sealing.

Compared with the prior art, the method has the advantages that:

according to the dry-type quick joint for the hydrogen tube bundle vehicle, when the male end and the female end are connected, air mixing in the pipeline can be effectively avoided, purging processes in the traditional bolt connection process and hydrogen loading and unloading operation processes are reduced, and hydrogen leakage accidents caused by accidental falling in the loading and unloading operation process can be effectively avoided due to the double-valve-core arrangement. The dry-type quick coupling can realize that hydrogen tube bank car and hydrogen fill the quick connection and the separation of filling the pipeline, can avoid flow such as sweeping, soapy water leak hunting, conveniently connects, and automatic decompression prevents to connect the accident of droing the leakage accident that causes that drops, can effectively ensure hydrogen tube bank car loading and unloading operation safety, has improved the reliability of loading and unloading operation integral connection greatly. The method is favorable for ensuring the safe use of hydrogen energy, and has long-term economic and social benefits in the aspects of promoting social development and activating market economy.

Drawings

The utility model will now be described with reference to the accompanying drawings.

Fig. 1 shows a structure in which a dry quick coupling for a hydrogen bundle cart according to the present invention is in a disconnected state.

Fig. 2 is a view of the configuration of the female end of the dry quick connector of fig. 1.

Fig. 3 shows the structure of the dry quick connector for a hydrogen bundle vehicle according to the present invention in a docked state.

Fig. 4 and 5 show the structure of a test platform for testing the performance of a dry quick connector.

In the present application, the drawings are all schematic and are used only for illustrating the principles of the utility model and are not drawn to scale.

Detailed Description

The utility model is described below with reference to the accompanying drawings.

Fig. 1 shows a configuration in which a dry quick connector 100 for a hydrogen bundle cart according to the present invention is in a disconnected state (i.e., a first state). As shown in fig. 1, the dry quick connector 100 includes a male end 200 and a female end 300. The male end 200 is used for connecting with a hydrogen tube bundle vehicle (tank car), and the female end 300 is used for connecting with a hydrogen filling pipeline. Public head end 200 and female head end 300 can the high-speed joint and the disconnection to realize that hydrogen tube bank car and hydrogen fill the quick connection and disconnection of pipeline, guarantee loading and unloading in-process hydrogen tube bank car and hydrogen fill the reliability that pipeline connection department is sealed. Therefore, the loading and unloading of the hydrogen tube bundle vehicle are realized.

As shown in fig. 1, the male end 200 includes a male gun holder 1 for connecting with a hydrogen bundle vehicle, a male gun head 4 fixedly connected with the male gun holder 1, and a single-phase valve core 6 disposed in the male gun head 4. In one embodiment, the male end 200 is flanged to the hydrogen bundle cart. The single-phase valve core 6 is installed inside the male gun head 4 through the male valve core seat 5, and the male valve core seat 5 is of a hollow structure and is installed in an internal channel of the male gun head 4. The single-phase valve core 6 is fixedly connected with the male valve core seat 5, and the single-phase valve core 6 and the male valve core seat 5 can move along the axial direction of the male gun head 4 integrally.

In one embodiment, the male gun seat 1, the male gun head 4, the male valve core seat 5, and the like in the male head end 200 are all made of 316 stainless steel, so that hydrogen embrittlement can be effectively avoided. And the male gun head 4 and the male gun seat 1 are preferably fixedly connected in a threaded connection mode. In addition, in order to ensure the sealing performance of the male tip 200, a sealing element is installed in the interlayer between the male tip 4 and the male tip seat 1, and the sealing element may be an O-ring, so that hydrogen in the dry-type quick coupling 100 can be effectively prevented from leaking into the atmosphere. The sealing element can be made of EPDM materials and has good wear resistance, ageing resistance and corrosion resistance.

According to the present invention, the single-phase spool 6 is configured to include a cylindrical body and a first connection rod connected to the cylindrical body, and a junction of the first connection rod and the cylindrical body is formed with a tapered surface, so that the single-phase spool 6 is formed in a funnel shape. The single-phase valve core 6 is fixedly connected with the male valve core seat 5 through a first connecting rod. In one embodiment, a threaded hole is provided in the middle of the male valve seat 5, and the single-phase valve core 6 is fixedly mounted in the threaded hole by a first connecting rod, so as to form a fixed connection with the male valve seat 5.

A first elastic member 3 is provided in the male gun mount 1, and the first elastic member 3 may be a compression spring, for example. The inner wall surface of the male gun seat 1 is provided with a first step 101 with an end surface facing to the right, and two ends of the first elastic part 3 respectively abut against the first step 101 and the male valve core seat 5. Meanwhile, an annular protrusion 61 is provided on the outer surface of the cylindrical body of the single-phase spool 6. Preferably, the sectional shape of the annular protrusion 61 is triangular. The function of the annular projection 61 will be described below.

As shown in fig. 1, the inlet end of the male lance tip 4 is configured as an annular lip extending radially inwardly. The axial inner end of the annular lip is formed into a limit opening in the shape of an inclined plane.

When the male tip 200 is in a self-sealing state (i.e., a first state), the single-phase spool 6 exerts a force toward the inlet end direction on the single-phase spool 6 under the pre-tightening force provided by the first elastic element 3, and the annular protrusion 61 on the cylindrical main body of the single-phase spool ring 6 abuts against the limit opening of the annular lip of the male tip 4, so that the single-phase spool 6 is limited. Therefore, the cylindrical body of the single-phase valve core 4 is tightly attached to the annular lip, so that the inlet end of the male gun head 4 is plugged, and the male head 200 forms self-sealing. Furthermore, a first sealing element 7 may be mounted in the limiting opening of the annular lip, and the first sealing element 7 may be an O-ring. In the self-sealing state of the male end 200, the annular protrusion 61 of the single-phase valve core 6 and the limiting port of the annular lip extrude the first sealing member 7 to realize self-sealing. The first sealing element 7 can be made of EPDM material and has good wear resistance, ageing resistance and corrosion resistance. In addition, can set up the mounting groove in the annular lip, install energy storage sealing washer 8 in the mounting groove, public head end 200 is in the state of proclaiming oneself, and energy storage sealing washer 8 closely laminates with the cylindrical main part of single-phase case 6 to realize self sealedly. This structure of the male tip 200 can especially ensure reliability of the self-sealing performance of the male tip 200.

In one embodiment, the energy storage sealing ring 8 adopts a mode that an inner 304 stainless steel spring ring is combined with outer EPDM (ethylene-propylene-diene monomer), so that the energy storage sealing ring 8 has a self-compensation characteristic, and the requirement of high-pressure dynamic sealing can be met. In addition to this, the present invention is,

according to the present invention, as shown in fig. 1 and 2, the female end 300 includes a female gun block 23 for connection to a hydrogen filling line, a female gun head 18 fixedly connected to the female gun block 23, a female gun case 14 disposed within the female gun head 18, and a fixed valve cartridge 20 disposed within the female gun case 14. In one embodiment, the female end 300 is flanged to the hydrogen fill line.

The female end 300 further comprises a fixed inner sleeve 21 fixedly connected with the female gun base 23, and the female gun head 18 is fixedly connected with the female gun base 23 through the fixed inner sleeve 21. The outer wall surface of the fixed inner sleeve 21 is provided with a second step 210 with an end surface facing to the left, and the female gun head 18 is fixedly connected with the outer wall surface of the fixed inner sleeve 21, so that an annular space is formed on the left side of the fixed inner sleeve 21, which is positioned at the second step 210. The female holster 14 is disposed in an annular space formed radially between the female pistol head 18 and the fixed inner holster 21. Meanwhile, a second elastic member 19 is provided between the female holster 14 and the second step 210 in the axial direction. The second elastic member 9 may be a compression spring. The two ends of the second resilient member 9 abut against the end face of the female holster 14 and the second step 210, respectively.

In one embodiment, the female gun seat 23, the female gun head 18, the female gun case 14, and the fixed valve element 20 in the female end 300 are all made of 316 stainless steel, so that hydrogen embrittlement can be effectively avoided. The female stock 23 is internally threaded and is threadedly connected to the hydrogen filling line. The fixed inner sleeve 21 is connected with the female gun seat 23 through screw threads.

As shown in fig. 2, a first stop shoulder 181 is provided on the inner wall of the female lance tip 18. Meanwhile, a first limit step 141 is provided on the outer wall of the female holster 14. The first stop step 141 is preferably provided at a position near the right end of the female holster 14. When the female end 300 is in the self-sealing state (i.e., the first state), the female holster 14 causes the first stopping step 141 to abut against the first stopping shoulder 181 by the second elastic element 9, so as to axially stop the female holster 14.

As shown in fig. 1, the fixed valve core 20 is installed inside the female end 300 through a female valve core seat 22, and the female valve core seat 22 is configured as a hollow structure and is fixedly installed on the inner wall of the fixed inner sleeve 21. Preferably, the female valve core seat 22 is in threaded connection with the fixed inner sleeve 21. The stationary spool 20 is configured to include a conical body and a second connecting rod connected to the conical body, and the stationary spool 20 is fixedly connected to the female spool seat 22 through the second connecting rod. In one embodiment, a threaded bore is provided in the middle of the female valve cartridge seat 22, and the stationary valve cartridge 20 is fixedly mounted in the threaded bore by a second connecting rod to form a fixed connection with the female valve cartridge seat 22.

According to the present invention, the female end 300 further includes a tapered inner sleeve 11 inserted into the fixed inner sleeve 21. A third elastic element 13 is arranged between the cone mouth inner sleeve 11 and the fixed inner sleeve 21. As shown in fig. 2, a limiting protrusion 111 is provided on an outer wall of the cone inner sleeve 11, and the third elastic member 13 is provided between the limiting protrusion 111 and the left end surface of the fixed inner sleeve 21. Meanwhile, a second limiting step 142 is arranged on the inner wall of the female gun case 14, and the female gun case 14 can drive the cone-mouth inner sleeve 11 to axially move by contacting the second limiting step 142 with the limiting protrusion 111 and compress the third elastic element 13.

In order to ensure the sealing between the countersunk inner sleeves 11 in the fixed inner sleeve 21, sealing elements 17 may be provided between the countersunk inner sleeves 11 in the fixed inner sleeve 21. The sealing element 17 may be an O-ring, for example.

In the self-sealing state (i.e., the first state) of the female end 300, under the action of the second elastic element 9, the left end surface of the female gun sleeve 14 is aligned with the valve core surface of the fixed valve core 20, and the female gun sleeve 14 abuts against the first limit shoulder 181 of the inner wall of the female gun head 18 through the first limit step 141 to form an axial limit. Meanwhile, under the action of the third elastic member 13, the end surface of the cone inner sleeve 11 is tightly attached to the conical surface of the conical body of the fixed valve core 20 to form self-sealing, so that the female end 300 forms self-sealing. And, the cone mouth terminal surface at cone mouth endotheca 11 can be equipped with the seal groove, installs second sealing member 9 in the seal groove, and second sealing member 9 can be the O type sealing washer. In the self-sealing state of the female head end 300, the second sealing member 9 is squeezed by the tapered end surface of the tapered inner sleeve 11 and the tapered surface of the fixed valve element 20 to realize self-sealing, so that the female head end 300 forms self-sealing. The sealing element 17 and the second sealing element 9 can be made of EPDM materials, and have good wear resistance, ageing resistance and corrosion resistance.

According to the present invention, the female end 300 further includes a gripping sleeve 16. As shown in fig. 1 and 2, the gripping sleeve 16 is fitted over the outside of the female tip 18, and the gripping sleeve 16 is capable of axial movement relative to the female tip 18. A fourth elastic element 15 is arranged between the holding sleeve 16 and the female gun head 18. The inner wall of the grip sleeve 16 is provided with a third limit step 161. Meanwhile, a second limiting shoulder 182 with an end surface facing to the left is arranged on the outer wall of the female gun head 18, and two ends of the fourth elastic element 15 respectively abut against the first end surface (the right end surface in fig. 1) of the third limiting step 161 and the second limiting shoulder 182.

A first end (the left end in fig. 1) of the female gun head 18 is provided with a plurality of circumferentially and uniformly distributed mounting holes, and the positioning bayonet pins 12 are respectively mounted in the mounting holes. Preferably, for example, four mounting holes may be provided. Meanwhile, the outer wall of the male gun head 4 close to the inlet end is provided with a mounting groove 41. When the female end 300 is in a self-sealing state, the fourth elastic element 15 abuts against the first end surface of the third limit step 161 on the inner wall of the grip sleeve 16, so as to apply a leftward acting force to the grip sleeve 16. Meanwhile, the plurality of positioning pins 12 contact with the second end face (left end in fig. 1) of the third stopping step 161 of the grip sleeve 16 to axially stop the grip sleeve 16. Thereby, the left end surface of the grip sleeve 16 is aligned with the spool surface of the fixed spool 20.

The plurality of positioning pins 12 are respectively and individually arranged, and the axial inner ends of the positioning pins 12 are configured into cambered surfaces, and the cambered surfaces are configured to be capable of being in surface contact with the mounting grooves 41 on the male lance head 4 of the male end 200.

As shown in fig. 1, a limiting collar 10 is provided on the axially outer side of the female lance head 18 at the positioning detent 12, the function of the limiting collar 10 being described below. The limit stop ring 10 can contact with the second end surface of the third limit step 161 of the grip sleeve 16 in the second state (in the state that the male end 200 is connected with the female end 300), so as to limit the grip sleeve 16 axially.

Fig. 3 shows the configuration of the dry quick connector 100 for a hydrogen bundle cart according to the present invention in a docked state (i.e., a second state). As shown in fig. 3, during the connection of the male end 200 and the female end 300 of the dry quick connector 100, the female holster 14 is first aligned with the male gun head 4 to move the female end 300 to the left. The end face of the right side of the male gun head 4 is completely attached to the end face of the left side of the female gun sleeve 14, and the end face of the right side of the single-phase valve core 6 is completely attached to the end face of the left side of the fixed valve core 20, so that external air cannot enter the dry-type quick connector 100. The single-phase valve core 6 continuously extrudes the first elastic part 3 to retreat to the left side under the action of the leftward acting force of the fixed valve core 20, the female gun sleeve 14 continuously extrudes the second elastic part 19 to retreat to the right side under the action of the counterforce of the male gun head 4 until the second limiting step 142 in the left end of the female gun sleeve 14 is contacted with the limiting bulge 111 on the outer wall of the conical opening inner sleeve 11, and the female gun sleeve 14 drives the conical opening inner sleeve 11 to continuously extrude the third elastic part 13 to retreat to the right. Until the female gun sleeve 14 and the tapered inner sleeve 11 are retracted to make the plurality of positioning pins 12 fall into the mounting grooves 41 of the male gun head 4. In one embodiment, the second end surface of the third stopping step 161 of the grip sleeve 16 is configured as an inclined end surface, whereby the grip sleeve 16 exerts a radially inward force on the inclined end surface against the positioning detent 12 under the elastic force of the fourth elastic member 15. Therefore, when the positioning bayonet 12 moves to correspond to the mounting groove 41 of the male tip 4, the positioning bayonet can be automatically clamped into the mounting groove 41 of the male tip 4 under the action of the inclined end surface. At the moment the positioning pins 12 fall into the mounting grooves 41 of the male gun head 4, the limiting effect of the positioning pins 12 on the holding sleeve 16 disappears. At this time, the grip sleeve 16 moves axially leftward under the action of the fourth elastic element 15 until the wire retainer ring 10 moves to contact with the second end surface of the grip sleeve 16, which faces the third limit step 161 of the grip sleeve 16, so as to limit the grip sleeve 16, thereby realizing the self-locking connection of the dry quick connector 100. Under the connection state that the male end 200 is plugged with the female end, the energy storage sealing ring 8 is tightly attached to the cone mouth inner sleeve 11, so that the self-sealing of the dry-type quick connector 100 is realized. The energy storage sealing ring 8 can efficiently seal hydrogen in the dry-type quick coupling 100, and hydrogen is effectively prevented from leaking to the atmosphere. In the second state, the fixed valve element 20 and the single-phase valve element 6 compress the first elastic member 3 integrally and move leftward in the axial direction with respect to the female gun mount 14 and the male gun head 4, so that the single-phase valve element 6 is separated from the annular lip of the inlet end of the male head end 200, and the fixed valve element 20 is separated from the tapered end surface 111 of the tapered inner sleeve 11, thereby conducting the internal passages of the male head end 200 and the female head end 300 and opening the dry quick coupling 100. After the male end 200 and the female end 300 are connected in place, the fixed valve element 20 and the single-phase valve element 6 inside the male end 200 and the female end 300 move to the maximum displacement, and at this time, the internal annular flow passage of the dry quick connector 100 is completely opened and the maximum flow area is formed. Therefore, the connection and conduction of the male head end 200 and the female head end 300 are completed, and at the moment, the hydrogen filling pipeline can fill hydrogen into the hydrogen tube bundle vehicle through the dry-type quick connector 100.

After the hydrogen tube bundle vehicle finishes filling hydrogen, the gas pressure in the hydrogen tube bundle vehicle is removed, and the dry-type quick connector 100 is disconnected. During disconnection of the dry quick connector 100, first, a force is applied to the grip sleeve 16 to the right, and the grip sleeve 16 is moved to the right. The holding sleeve 16 moves rightwards to a certain position, specifically, when the holding sleeve 16 moves to the position that the second end face of the third limiting step 161 is located at the axial inner side of the mounting hole, the plurality of positioning bayonet pins 12 can automatically bounce from the mounting groove 41 of the male gun head 4, so that the plurality of positioning bayonet pins 12 generate a limiting effect on the holding sleeve 16 again. In one embodiment, the side wall surface of the mounting groove 41 is configured as an inclined end surface, whereby the inclined end surface (right side wall surface in fig. 3) of the male gun head 4 and the female gun holster 14 exerts a radially outward force on the positioning bayonet 12 under the elastic force of the second elastic member 19. Therefore, when the grip sleeve 16 is moved to a position where the second end surface of the third position-limiting step 161 is located at the axially inner side of the mounting hole, the positioning pin 12 can automatically bounce under the action of the inclined end surface and snap into the second end surface of the third position-limiting step 161 of the grip sleeve 16, thereby generating a position-limiting action on the grip sleeve 16 again. In the process of disconnecting the dry quick connector 100, the single-phase valve core 6 of the male head end 200 is rapidly pushed under the action of the first elastic member 3 to be tightly attached to the annular lip of the inlet end of the male head 4, and self-sealing is realized under the action of the first sealing member 7 and the energy storage sealing ring 8, so that the male head end 200 is closed. Meanwhile, the cone mouth inner sleeve 11 of the female end 300 is rapidly pushed under the action of the third elastic member 13 to be tightly attached to the fixed valve core 20 and realize self-sealing under the action of the second sealing member 9, and meanwhile, the female gun sleeve 14 is rapidly pushed under the action of the second elastic member 19 to be aligned with the valve core surface of the left end of the fixed valve core 20, so that the female end 300 is closed. Thus, the dry quick coupling 100 realizes the self-sealing by breaking off and dropping.

According to the dry-type quick connector 100 for the hydrogen tube bundle vehicle, when the male end 200 is connected with the female end 300, air mixing inside a pipeline can be effectively avoided, purging processes during traditional bolt connection are reduced, hydrogen loading and unloading operation processes are reduced, and hydrogen leakage accidents caused by accidental falling in the loading and unloading operation process can be effectively avoided due to the double-valve-core arrangement. The dry-type quick coupling 100 can realize quick connection and separation of the hydrogen tube bundle vehicle and a hydrogen filling pipeline, can avoid flows such as purging, soapy water leakage detection and the like, is convenient to connect and automatically reduces pressure, prevents leakage accidents caused by accidental falling of the coupling, can effectively guarantee the safety of loading and unloading operations of the hydrogen tube bundle vehicle, and greatly improves the reliability of the integral connection of the loading and unloading operations.

In practical application, according to the loading and unloading operation requirement of the hydrogen tube bundle vehicle, the dry-type quick connector 100 for the hydrogen tube bundle vehicle needs to be subjected to performance tests, specifically, a static pressure strength test, an air tightness test, a fatigue test and a flow test. In accordance with the present invention, a test platform is used to test the performance of the dry quick connector 100. The following describes the performance testing procedures.

And (3) carrying out a static pressure strength test, wherein the pressure of a medium conveyed by the dry type quick connector for loading and unloading the hydrogen tube bundle vehicle is 20MPa, and in order to judge whether the quick connector can meet the strength requirement in the conveying process, carrying out a static pressure test of 28.5MPa on the quick connector, and observing whether the pressure-bearing part and the sealing part of the one-way valve have leakage or not, and whether the corresponding structural part has fracture or damage or not.

And carrying out a static pressure strength test on the female head end. Specifically, the female end of the dry-type quick connector is subjected to hydrostatic pressure of about 28.5MPa for 10min for detection, no leakage exists at the sealing positions of the pressure-bearing part and the one-way valve, and the corresponding structural part is not cracked or damaged.

And (4) carrying out a static pressure strength test on the male head end. Specifically, the male end of the dry-type quick connector is subjected to hydrostatic pressure of about 28.5MPa for 10min for detection, no leakage exists at the sealing positions of the pressure-bearing part and the one-way valve, and the corresponding structural part is not cracked or damaged.

And, the female head end and the male head end are combined to perform a static pressure strength test. Specifically, after the female head end and the male head end of the dry-type quick connector 100 are combined, hydrostatic pressure of about 28.5MPa is applied for pressure stabilization for 10min for detection, no leakage exists at the sealing positions of the pressure-bearing part and the valve core, and no breakage or damage exists in the corresponding structural parts.

As shown in fig. 4, the testing platform for testing includes a hydraulic testing system 410, wherein the hydraulic testing system 410 includes a water tank 411, a hydraulic press 412, a liquid phase valve 413, a water pressure gauge 414, a water inlet joint 415, a water outlet 416, and a control system 417, which are sequentially connected. The specific operation flow is that the female head end and the male head end of the dry-type quick connector 100 are respectively connected with a water inlet connector 415 of a test platform, a hydraulic press 412 is started, a liquid phase valve 413 is opened to adjust the water pressure to 28.5MPa, a touch screen of the operation control system 417 starts a static pressure strength test after inputting test related data, a pipeline is decompressed after the test is finished, and a test result is recorded into the system.

And (3) performing an air tightness test, wherein the dry-type quick joint has to meet the operation requirement of zero leakage, and the air tightness is a key index for ensuring no leakage. In order to test the air tightness of the quick joint and meet the air tightness requirement of the loading and unloading operation of the hydrogen tube bundle vehicle, compressed air of about 28.5MPa and 1MPa is introduced into the dry type quick joint and is wholly immersed in clear water, and whether bubbles emerge is judged.

And (3) carrying out a normal-temperature air tightness test on the female head end, respectively introducing compressed air of about 28.5MPa and 1MPa into the female head end, wholly immersing the female head end into clear water, and stabilizing the pressure for 3min for detection, wherein no bubbles emerge at the sealing position of the fixed valve core 20 and the periphery of other parts of the female head end.

And (3) carrying out a normal-temperature air tightness test on the male head end, respectively introducing compressed air of about 28.5MPa and 1MPa into the male head end, wholly immersing the male head end into clear water, and stabilizing the pressure for 3min for detection, wherein no bubbles emerge at the sealing position of the one-way valve core 6 and the periphery of other parts of the male head end.

And (3) carrying out a normal-temperature air tightness test on the combination of the female end and the male end, respectively introducing compressed air of about 28.5MPa and 1MPa into the combination of the female end and the male end, and totally immersing the combination of the female end and the male end in clear water for stabilizing the pressure for 3min for detection, wherein no bubbles are emitted at the sealing positions of the one-way valve core 6 and the fixed valve core 20 and at the peripheries of other parts.

As shown in fig. 4, the testing platform further includes an air tightness testing system 420, and the air tightness testing system 420 includes a hollow air compressor 421, a high-pressure air compressor 422, an air valve 423, an air pressure gauge 424, a water bath tank 425, and an exhaust valve 426, which are connected in sequence. The specific operation flow is that the male end and the female end of the dry-type quick connector 100 are respectively connected with an air tightness test system 420 in a test platform, the male end and the female end are respectively immersed in water according to test requirements, a hollow air compressor 421 and a high-pressure air compressor 422 are used for pressurizing and adjusting the pressure of a pipeline to 1MPa, the air tightness test is started after the touch screen of the operation control system 417 inputs test related data, the pipeline pressure is adjusted to 28.5MPa for retesting, the pipeline is decompressed after the test is finished, and the test result is recorded into the system.

And performing fatigue test, namely repeatedly connecting and disconnecting the dry-type quick joint, wherein the quick joint is fatigue due to repeated use of vulnerable elements such as an elastic part, a sealing part and the like, and performing the fatigue test on the quick joint for verifying the connection reliability. The male end of the dry-type quick connector is fixed on an operation table, the female end is inserted into or withdrawn from the socket by pushing and pulling the cylinder, the operation is repeated for 5000 times according to the frequency of about 10 s/time, the female end and the male end are not obviously deformed or damaged by visual observation, and the normal-temperature air tightness test is carried out again according to the requirements of the

test items

1 and 2 without air leakage.

As shown in fig. 4, the testing platform further includes a fatigue testing system 430, and the fatigue testing system 430 includes a servo motor 431, an electromagnetic clutch 432, a reduction transmission system 433, a cylinder 434, and a hydrogen connector 435. The specific operation flow is that the male end and the female end of the dry-type quick connector 100 are connected with a test platform, the automatic connection and disconnection of the dry-type quick connector are realized by using the servo motor 431, the electromagnetic clutch 432 and the reduction transmission system 433, and the male end and the female end are respectively fixed. The hydraulic press 412 is started to adjust the pressure of the pipeline to 20Mpa, after the pipeline is connected once, the male head end and the female head end are separated after pressure relief, the process is repeated for 5000 times, the fatigue test is started after test related data are input by the touch screen of the operation control system 417, the pipeline is relieved after the test is finished, and the test result is recorded into the system.

And (3) carrying out flow test, wherein a valve umbrella is arranged in the dry-type quick connector 100 for loading and unloading the hydrogen bundle vehicle, so that a certain pressure drop can be caused, and the dry-type quick connector 100 is subjected to flow test for verifying whether the circulation of the dry-type quick connector can meet the flow requirement of the loading and unloading operation of the hydrogen bundle vehicle.

As shown in fig. 5, the operating platform further includes a flow testing system 440. The flow test system 440 includes a surge tank 441, a check valve 442, a high pressure compressor 443, a hydrogen tank 444, a cylinder 445, a differential pressure sensor 446, an electromagnetic flow meter 447, and a pressure transmitter 448, and a plurality of pneumatic butterfly valves 449 connected in a pipeline as on-off valves. The specific operation flow is that the dry quick connector 100 is connected to the pipeline of the flow test system 440 through the male end and the female end, and the air cylinder 445 is used for automatic connection. And after the connection is confirmed to be correct, starting the system by using the touch screen to start the high-pressure compressor 443 and related valves, starting testing after the flow is stable, uploading system output data to an upper computer, relieving pressure of a pipeline after the testing is finished, and inputting a test result into the system.

In the description of the present invention, it is to be understood that the terms "left", "right", etc., indicate orientations or positional relationships based on those shown in the drawings only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dry quick connector for a hydrogen bundle cart, comprising:

the male end (200) comprises a male gun seat (1), a male gun head (4) fixedly connected with the male gun seat and a single-phase valve core (6) arranged in the male gun head;

the female head end (300) comprises a female head gun seat (23), a female head gun head (18) fixedly connected with the female head gun seat, a female head gun sleeve (14) arranged in the female head gun head and a fixed valve core (20) arranged in the female head gun sleeve;

wherein, in the first state, the male end blocks the inlet end of the male gun head through the single-phase valve core to form self-sealing, the female end blocks the outlet end of the female gun head through the fixed valve core to form self-sealing,

in a second state, aligning and attaching the female gun case to the male gun head, attaching the fixed valve core to the end face of the single-phase valve core, enabling the fixed valve core and the single-phase valve core to axially move relative to the female gun case and the male gun head so as to conduct internal channels of the male head end and the female head end to open the dry-type quick connector,

the first state and the second state can be switched, so that connection and disconnection of the male head end and the female head end are completed.

2. The dry quick connector according to claim 1, wherein the single-phase valve element is mounted in the male gun head through a male valve element seat (5) configured as a hollow structure and can move axially along the male gun head,

3. Dry quick connector according to claim 2, characterized in that the inner wall of the male turret is provided with a first step (101), in which a first elastic element (3) is provided, the two ends of which respectively abut against the first step and the male valve core seat, and in that an annular projection (61) is provided on the outer surface of the cylindrical body,

4. The dry type quick coupling according to claim 1, wherein the female tip further comprises a fixed inner sleeve (21) connected to the female tip holder, a second step (210) is provided on an outer portion of the fixed inner sleeve, the female tip is fixedly connected to an outer wall surface of the fixed inner sleeve, the female tip is disposed between the female tip and the fixed inner sleeve in a radial direction, a second elastic member (19) is provided between the female tip and the second step, a first limit shoulder (181) is provided on an inner wall of the female tip, a first limit step (141) is provided on an outer wall of the female tip,

5. Dry quick-disconnect coupling as claimed in claim 4, characterized in that the stationary valve cartridge is mounted inside the female end by a female valve cartridge seat (22) configured as a hollowed-out structure,

6. Dry quick connector according to claim 4, characterized in that said female end further comprises a tapered inner sleeve (11) inserted into said fixed inner sleeve, a third elastic member (13) being provided between said tapered inner sleeve and said fixed inner sleeve,

7. The dry quick coupling as claimed in claim 6, wherein a limit protrusion (111) is formed on an outer wall of the cone inner sleeve, the third elastic member is disposed between the limit protrusion and an end surface of the fixed inner sleeve, and a second limit step (142) is formed on an inner wall of the female gun case,

8. Dry quick connector according to claim 6, characterized in that a grip sleeve (16) is fitted over the outside of the female tip, a fourth elastic element (15) is provided between the grip sleeve and the female tip,

the inner wall of the holding sleeve is provided with a third limiting step (161), the outer wall of the female gun head is provided with a second limiting shoulder (182), and two ends of the fourth elastic piece respectively abut against the first end face of the third limiting step and the second limiting shoulder.

9. The dry quick connector according to claim 8, wherein the first end of the female connector comprises a plurality of mounting holes which are uniformly distributed in the circumferential direction, positioning pins (12) are respectively mounted in the mounting holes, a mounting groove (41) is formed in the outer wall of the male connector close to the inlet end,

10. The dry quick connector according to claim 9, wherein in the second state, a force is applied to the grip sleeve to axially move the grip sleeve, the plurality of positioning pins are configured to automatically spring up from the mounting groove of the male tip when the grip sleeve moves to a position where the second end face of the third limiting step is located axially inside the mounting hole, so that the plurality of positioning pins re-limit the grip sleeve, and the male tip and the female tip simultaneously form self-sealing to complete self-sealing and separation.