interface

Abstract

The application discloses an interface, which comprises a main body, a valve core, a sealing ring, a second spring and a locking device. The main body has an axial stepped through hole, which comprises three sections, i.e., a left section, a middle section and a right section. The middle section has the smallest hole diameter. The valve core is installed in the through hole of the main body and can move back and forth along the axial direction of the through hole. The valve core has a stepped shaft shape. A part of the valve core cooperates with the middle section of the through hole of the main body to close or open the through hole. The left section of the through hole is provided with the sealing ring. The second spring is installed in the through hole and abuts against the valve core to close the through hole when the valve core moves to the left. The locking device is arranged on the main body. The interface is installed on a liquid hydrogen storage tank and can be connected with a low-temperature hydrogen recovery device to form a hydrogen recovery channel. The interface can recover and depressurize the vaporized low-temperature hydrogen in the liquid hydrogen storage tank before liquid hydrogen is filled, and facilitates the filling of the liquid hydrogen. The interface can also form a seal to prevent hydrogen leakage and has a simple operation process, thereby avoiding hydrogen leakage.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of hydrogen recovery pressure relief device, and particularly relates to an interface. BACKGROUND

[0002] Under the background of national energy saving and emission reduction and new energy industry development, hydrogen energy stands out due to its high calorific value and environmental protection advantages. Compared with high-pressure hydrogen, liquid hydrogen has the advantages of low pressure, high energy density and convenient storage and transportation. Therefore, liquid hydrogen has a broader application prospect in new energy vehicles.

[0003] Compared with other liquid fuels, liquid hydrogen has the characteristics of easy vaporization and easy explosion. During the filling process, the hydrogen in the liquid hydrogen tank should be discharged first, which also plays a role in pressure relief. During the hydrogen discharge process, due to the extremely small molecular weight of hydrogen, the sealing structure of hydrogen needs to be good, and the operation process needs to be simplified, the labor intensity needs to be reduced, and the possibility of hydrogen leakage needs to be reduced.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, provide an interface that can cooperate with other devices to recover hydrogen, and has a simple operation process and avoids hydrogen leakage.

[0006] To solve the above technical problems, the basic idea of the technical scheme adopted by the present application is:

[0007] The interface comprises a main body, a valve core, a sealing ring, a second spring and a locking device.

[0008] The main body has an axial stepped through hole, the main body through hole includes left, middle and right three sections, the hole diameter of the middle section of the main body through hole is the smallest, the valve core is installed in the main body through hole and can move back and forth along the axial direction of the through hole, the valve core has a stepped shaft shape, a part of the valve core cooperates with the middle section of the main body through hole to close or open the main body through hole; the wall of the left section of the main body through hole is provided with a sealing ring, and the main body through hole is provided with a second spring which abuts against the valve core to close the through hole by moving leftwards; the locking device is arranged on the main body.

[0009] Further, the valve core includes left, middle and right three sections, the left section of the valve core is a top rod, the middle section of the valve core has a tapered surface, the right section of the valve core has an axial half through hole, a second through hole is arranged on the wall of the half through hole, and the middle section of the valve core cooperates with the middle section of the main body through hole to close or open the main body through hole.

[0010] Further, the interface further comprises a sealing seat, the sealing seat is coaxially installed in the left section of the main body through hole and located on the right side of the sealing ring, and the center of the sealing seat has an axial channel.

[0011] Further, the sealing seat comprises an annular fin plate located inside the sealing seat, the sealing seat holes on the left and right sides of the annular fin plate are larger than the inner diameter of the annular fin plate, and the right side of the annular fin plate is provided with an annular groove, and the annular groove is provided with an elastic element.

[0012] Further, the inner diameter of the elastic element is consistent with the inner diameter of the annular fin plate.

[0013] Further, the right side of the annular groove is provided with a guide hole, and the top rod of the left section of the valve core is inserted into the guide hole.

[0014] Further, the outer side of the main body is provided with a locking device, the locking device is a rotary groove, the rotary groove comprises two sections, the first section extends rightwards along the axial direction of the main body and circumferentially along the main body, and the second section continues to extend circumferentially along the main body, and the second section has a hook bend extending leftwards along the axial direction of the main body at the end of the second section.

[0015] Further, the interface further comprises a second compression ring, the second compression ring has an axial through hole, the second compression ring is fixed to the right section of the main body, one end of the second spring abuts against the second compression ring, and the other end abuts against the valve core.

[0016] Further, the elastic element is a non-metallic elastic element.

[0017] Further, the interface further comprises a third compression ring, the third compression ring is fixed to the left end of the main body, and the third compression ring blocks the sealing ring and the sealing seat.

[0018] After adopting the above technical scheme, the present application has the following beneficial effects compared with the prior art.

[0019] The interface comprises a main body, a valve core, a sealing ring, a second spring and a locking device, the main body has an axial stepped through hole, the main body through hole comprises three sections of left, middle and right, the hole diameter of the middle section of the main body through hole is the smallest, the valve core is installed in the main body through hole and can move back and forth along the axial direction of the through hole, the valve core has a stepped shaft shape, and a part of the valve core cooperates with the middle section of the main body through hole to close or open the main body through hole; the wall of the left section of the main body through hole is provided with a sealing ring, the main body through hole is provided with a second spring abutting against the valve core to move leftwards to close the through hole; and the main body is provided with a locking device. The interface is installed in a liquid hydrogen storage tank and can be connected with a low-temperature hydrogen recovery device to form a hydrogen recovery channel, and the vaporized low-temperature hydrogen in the liquid hydrogen storage tank is recovered and depressurized before liquid hydrogen is filled, which facilitates liquid hydrogen filling.

[0020] The specific embodiments of the present application will be further described in detail below with reference to the drawings. Attached Figure Description

[0021] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a half-sectional schematic diagram of the interface of the present invention;

[0023] Figure 2 This is a schematic diagram of the interface structure of the present invention;

[0024] Figure 3 This is a half-sectional schematic diagram of a cryogenic hydrogen recovery device;

[0025] Figure 4 This is a schematic diagram of the interface of the present invention and the low-temperature hydrogen recovery device;

[0026] Figure 5 This is a schematic diagram of the interface of the present invention and the low-temperature hydrogen recovery device;

[0027] Figure 6 This is a schematic diagram of the interface of the present invention and its cooperation with the low-temperature hydrogen recovery device.

[0028] In the diagram: 101, third pressure ring; 102, sealing ring; 103, main body; 104, second spring; 105, second pressure ring; 106, valve core; 107, sealing seat; 108, elastic element; 109, fin plate; 110, guide hole; 111, second through hole; 112, swirl groove; 200, housing; 201, pin; 202, guide tube; 203, valve disc; 204, handle; 205, first spring; 206, first through hole; 207, first pressure ring.

[0029] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In combination with Figure 1 , 2 , the interface of the present application includes a main body 103, a valve core 106, a sealing ring 102, a sealing seat 107, a second spring 104 and a locking device.

[0034] The main body 103 has an axial stepped through hole, and the through hole of the main body 103 includes three segments, i.e. a left segment, a middle segment and a right segment, and the hole diameter of the middle segment of the through hole of the main body 103 is the smallest.

[0035] The valve core 106 is installed in the through hole of the main body 103 and can move back and forth along the axial direction of the through hole, and the valve core 106 has a stepped shaft shape, including a left segment, a middle segment and a right segment, the left segment of the valve core 106 is a top rod, the outer periphery of the middle segment of the valve core 106 has a tapered surface, and the right segment of the valve core 106 has an axial half through hole with an open right end, and a second through hole 111 is arranged on the wall of the half through hole. As shown in Figure 1 , the valve core 106 has a stepped shaft shape, and the outer diameters of the left segment, the middle segment and the right segment increase in turn, and the second through hole 111 is arranged at the bending position of the right segment of the valve core 106, i.e. the adjacent position of the right segment and the middle segment of the valve core 106, to communicate the outside of the valve core 106 with the half through hole of the right segment of the valve core 106.

[0036] A part of the valve core 106 cooperates with the middle segment of the through hole of the main body 103 to close or open the through hole of the main body 103. In this embodiment, the middle segment of the valve core 106 cooperates with the middle segment of the through hole of the main body 103 through the tapered surface of the outer periphery to close or open the through hole of the main body 103.

[0037] As shown in Figure 1As shown, the wall of the left section of the through hole of the main body 103 is provided with a sealing ring 102, the right side of the sealing ring 102 is provided with a sealing seat 107, the sealing seat 107 is coaxially installed in the left section of the through hole of the main body 103, and the center of the sealing seat 107 has an axial passage. The interface further comprises a third compression ring 101, the third compression ring 101 is fixed to the left end of the main body 103 by a screw, and blocks the sealing ring 102 and the sealing seat 107 to prevent them from coming out of the through hole of the main body 103.

[0038] The sealing seat 107 comprises an annular fin plate 109, the annular fin plate 109 is located inside the sealing seat 107, the hole diameter of the sealing seat 107 on the left and right sides of the annular fin plate 109 is larger than the inner diameter of the annular fin plate 109, the right side of the annular fin plate 109 is an annular groove, and the annular groove is provided with an elastic element 108. The inner diameter of the elastic element 108 is consistent with the inner diameter of the annular fin plate 109, so that when the left side of the annular fin plate 109 is subjected to a rightward pressure and slightly deformed to the right, the elastic element 108 is also deformed under pressure, and after the pressure decreases or is removed, the elastic element 108 can restore the annular fin plate 109 to the left by its own elastic force. The inner diameter of the elastic element 108 is consistent with the inner diameter of the annular fin plate 109, so that the annular fin plate 109 is entirely supported in the radial dimension by the elastic element 108, avoiding partial annular fin plate 109 without elastic element 108 support resulting in pressure deformation and unable to reset. In this embodiment, the elastic element 108 is made of non-metallic elastic material.

[0039] The right side of the annular groove is provided with a guide hole 110, and the top rod of the left section of the valve core 106 is inserted into the guide hole 110. Since the top rod of the left section of the valve core 106 is an elongated rod, in order to enable the top rod to move stably in the axial direction, the guide hole 110 is provided on the sealing seat 107 to stabilize the top rod.

[0040] The right section of the through hole of the main body 103 is installed with a second spring 104 to resist the left movement of the valve core 106 to close the through hole; in order to limit the valve core 106 and the second spring 104 from coming out of the right end of the through hole of the main body 103 after the valve core 106 and the spring are installed in the through hole of the main body 103, the interface further comprises a second compression ring 105, the second compression ring 105 has an axial through hole, the second compression ring 105 is fixed to the right section of the main body 103, one end of the second spring 104 abuts against the second compression ring 105, and the other end abuts against the valve core 106. In this embodiment, one end of the second spring 104 is located in the axial half through hole of the right section of the valve core 106 to abut against the valve core 106.

[0041] A locking device is provided on the main body 103. The locking device plays a role of connecting and locking the interface with the low-temperature hydrogen recovery device. In this embodiment, as shown in Figure 2As shown, the outer side of the main body 103 is provided with a locking device, which is a rotary groove 112. The rotary groove 112 includes two sections. The first section extends axially rightward along the main body 103 and circumferentially along the main body 103 from the left end of the main body 103. The second section continues to extend circumferentially along the main body 103 and has a hook bend extending axially leftward at the end of the second section.

[0042] As shown, Figure 3 As shown, the low-temperature hydrogen recovery device includes a conduit 202, a valve flap 203, a first spring 205, and a limiting device.

[0043] The conduit 202 is provided with an axial through hole. The through hole of the conduit 202 is a stepped hole. The valve flap 203 is arranged in the through hole of the conduit 202 and can move axially in the through hole of the conduit 202 to close or open the through hole of the conduit 202. One end of the through hole of the conduit 202 is provided with a limiting device to limit the valve flap 203 from being taken out of the conduit 202 from this end. The other end of the through hole of the conduit 202 has a hole diameter smaller than the partial outer diameter of the valve flap 203 to form a limiting step and limit the valve flap 203 from being taken out of the conduit 202 from this end.

[0044] The outer part of the valve flap 203 is a stepped shaft. The valve flap 203 includes three sections: a section with an axial half through hole close to the limiting device, a top rod, and an intermediate section between the two. The outer diameter of the intermediate section is the largest.

[0045] The hole diameter of the other end of the through hole of the conduit 202 away from the limiting device is smaller than the partial outer diameter of the intermediate section of the valve flap 203, so that the through hole of the conduit 202 is closed or opened by the cooperation between the two. Specifically, in this embodiment, the intermediate section of the valve flap 203 has a tapered surface on the outer periphery. The end of the intermediate section of the valve flap 203 away from the limiting device is a small-diameter end of the tapered surface. The outer diameter of the small-diameter end of the tapered surface is smaller than the hole diameter of the other end of the through hole of the conduit 202 away from the limiting device. The outer diameter of the large-diameter end of the tapered surface is larger than the hole diameter of the other end of the through hole of the conduit 202 away from the limiting device. The intermediate section of the valve flap 203 cooperates with the other end of the through hole of the conduit 202 away from the limiting device through the tapered surface on the outer periphery. The through hole of the conduit 202 is closed or opened by the axial movement of the valve flap 203. The aforementioned other end of the through hole of the conduit 202 away from the limiting device refers to a section of the through hole of the conduit 202 extending from the other end of the through hole of the conduit 202 away from the limiting device and towards the limiting device.

[0046] In this embodiment, the limiting device is a first pressing ring 207. The first pressing ring 207 is coaxially fixed in the through hole of the conduit 202. The inner diameter of the first pressing ring 207 is smaller than the outer diameter of the adjacent end of the valve flap 203, so as to limit the valve flap 203 from being taken out of the conduit 202 from this end.

[0047] The valve flap 203 is sleeved with the first spring 205. One end of the first spring 205 abuts against the limiting device, i.e., the first pressing ring 207. The other end of the first spring 205 abuts against the outer peripheral step of the valve flap 203.

[0048] The valve disc 203 has an axial semi-through hole near the limiting device. Multiple first through holes 206 are evenly arranged on the wall of the semi-through hole along the circumference of the valve disc 203. The first through holes 206 are located on the side of the limiting step near the limiting device, i.e., the first pressure ring 207. The outer circumferential step of the valve disc 203 that abuts against the first spring 205 is located on the side of the first through hole 206 of the valve disc 203 near the first pressure ring 207.

[0049] The push rod is located on the side of the valve disc 203 away from the first pressure ring 207 and extends axially along the conduit 202, with the end of the push rod located inside the conduit 202. The outer diameter of the push rod is much smaller than the inner diameter of the through hole of the conduit 202.

[0050] A housing 200 is fixedly mounted coaxially on the outside of the conduit 202. There is an annular gap between the end of the housing 200 away from the limiting device and the conduit 202. The annular gap has a certain length along the axial direction of the conduit 202. A pin 201 is provided on the housing 200 radially and extends into the annular gap.

[0051] Since the cryogenic hydrogen recovery device needs to be connected to an interface, a handle 204 is provided on the outside of the housing for better operation.

[0052] During operation, the cryogenic hydrogen recovery device connects with the interface installed in the liquid hydrogen storage tank to form a hydrogen recovery channel.

[0053] The cryogenic hydrogen recovery device is connected to the interface, such as... Figure 4 As shown, the left end of the interface is inserted into the annular gap formed between the end of the housing 200 away from the limiting device and the conduit 202. The pin 201 of the cryogenic hydrogen recovery device is inserted into the locking device, i.e., the swivel groove 112, on the outside of the interface body 103. By rotating the handle 204 on the outside of the cryogenic hydrogen recovery device, the pin 201 of the cryogenic hydrogen recovery device slides in the swivel groove 112 on the outside of the interface body 103. Since the swivel groove 112 on the outside of the interface body 103 includes two sections, the first section extends from the left end of the body 103 along the axial direction of the body 103 to the right and along the circumference of the body 103. The pin 201 slides in the first section of the swivel groove 112 on the outside of the interface body 103. The cryogenic hydrogen recovery device is inserted into the interface and the inserted part gradually increases to achieve a tight connection.

[0054] During the docking process, such as Figure 4 As shown, the push rod of the valve disc 203 of the cryogenic hydrogen recovery device is in contact with the push rod of the valve core 106 of the interface.

[0055] Continue rotating handle 204 to achieve locking, as shown. Figure 5As shown, due to the fact that the pre-tightening force of the first spring 205 of the low-temperature hydrogen recovery device is less than that of the second spring 104 of the interface, the valve disc 203 of the low-temperature hydrogen recovery device moves towards the limiting device, the tapered surface on the outer periphery of the middle section of the valve disc 203 is separated from the end section of the through hole of the guide pipe 202 away from the limiting device, and the through hole of the guide pipe 202 is opened. The outer periphery of the end section of the guide pipe 202 away from the limiting device is in contact with the sealing ring 102 of the interface, and a first seal is formed.

[0056] During the docking and locking process, the valve disc 203 of the low-temperature hydrogen recovery device no longer moves after contacting the first pressing ring 207 of the limiting device.

[0057] The handle 204 is continuously rotated to achieve locking, as shown in FIG. 6. Figure 6 As shown, since the valve disc 203 of the low-temperature hydrogen recovery device cannot move to the left after contacting the first pressing ring 207 of the limiting device, the valve core 106 of the interface moves to the right under the action of pressure, the second spring 104 of the interface is compressed, the tapered surface on the outer periphery of the middle section of the valve core 106 is separated from the middle section of the through hole of the main body 103, and the through hole of the main body 103 of the interface is opened. At this time, since the valve disc 203 of the low-temperature hydrogen recovery device no longer closes the through hole of the guide pipe 202 of the low-temperature hydrogen recovery device, and the valve core 106 of the interface no longer closes the through hole of the main body 103 of the interface, a smooth hydrogen recovery channel is formed. At this time, the vaporized low-temperature hydrogen in the liquid hydrogen tank enters the interface through the center hole of the second pressing ring 105 from the right section, then passes through the half-through hole of the right section of the valve core 106, the second through hole 111 on the half-through hole wall, the through hole of the main body 103 of the interface, and then enters the through hole of the guide pipe 202 of the low-temperature hydrogen recovery device from the right side, passes through the first through hole 206 on the axial half-through hole wall of the section of the valve disc 203 close to the limiting device, and then flows away through the center hole of the first pressing ring 207, thereby achieving the recovery and discharge of the vaporized low-temperature hydrogen in the liquid hydrogen tank and playing a pressure relief role.

[0058] Since the second section of the spiral groove 112 on the outer side of the main body 103 of the interface continues to extend along the circumference of the main body 103 of the interface, the pin shaft 201 slides in the second section of the spiral groove 112 on the outer side of the main body 103 of the interface, the low-temperature hydrogen recovery device is inserted into the interface, and the inserted part is stable and tightly docked. At this time, after the low-temperature hydrogen recovery device and the interface are completely locked, the right end of the guide pipe 202 of the low-temperature hydrogen recovery device abuts against the annular fin plate 109 of the sealing seat 107 in the through hole of the main body 103 of the interface, the annular fin plate 109 is slightly deformed to the right, and the annular groove on the right side of the annular fin plate 109 is provided with an elastic member 108 to support the annular fin plate 109.

[0059] Due to the hook bend at the end of the second section of the screw groove 112 extending axially leftward along the interface body 103, the pin shaft 201 slides in the second section of the screw groove 112 outside the interface body 103 to the hook bend, so that the portion of the cryogenic hydrogen recovery device inserted into the interface is slightly less, the right end of the conduit 202 of the cryogenic hydrogen recovery device still abuts against the annular fin 109 of the sealing seat 107 in the through hole of the interface body 103, but the annular fin 109 recovers leftward and no longer deforms or the deformation is reduced. At this time, the right end of the conduit 202 of the cryogenic hydrogen recovery device abutting against the annular fin 109 of the sealing seat 107 in the through hole of the interface body 103 forms a second seal to prevent the leakage of the vaporized cryogenic hydrogen during the recovery and discharge.

[0060] The interface of the present application is installed in the liquid hydrogen storage tank and can be docked with the cryogenic hydrogen recovery device to form a hydrogen recovery channel, and the vaporized cryogenic hydrogen in the liquid hydrogen storage tank is recovered and pressure released before liquid hydrogen filling, which facilitates liquid hydrogen filling. When not docked with the cryogenic hydrogen recovery device, the hydrogen flow channel of the interface is closed, and during the docking process, the hydrogen flow channel of the cryogenic hydrogen recovery device is first opened, and a seal is formed with the cryogenic hydrogen recovery device to prevent hydrogen leakage, and then the hydrogen flow channel of the interface is further opened and a second seal is formed with the cryogenic hydrogen recovery device to prevent hydrogen leakage, the operation process is simple, and hydrogen leakage is avoided.

[0061] The above description is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application, and any skilled person in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and the equivalent embodiments with equivalent changes are equivalent. The embodiments in the above-mentioned embodiments can be further combined or replaced, but as long as it does not deviate from the technical solution of the present application, any simple modification, equivalent change and modification of the above-mentioned embodiments according to the technical essence of the present application are still within the scope of the present application.

Claims

1. An interface, characterized by: The utility model relates to a low-temperature hydrogen recovery device, comprising a main body, a valve core, a sealing ring, a second spring and a locking device, The main body has an axial stepped through hole, the main body through hole comprises left, middle and right three sections, the aperture of the middle section of the main body through hole is the smallest, the valve core is installed in the main body through hole and can move back and forth along the axial direction of the through hole, the valve core has a stepped shaft shape, a part of the valve core cooperates with the middle section of the main body through hole to close or open the main body through hole; The wall of the left section of the main body through hole is provided with the sealing ring, The second spring is installed in the main body through hole and abuts against the valve core to move leftwards to close the through hole; The utility model further comprises a sealing seat, which is coaxially installed in the left section of the main body through hole and located on the right side of the sealing ring, and the center of the sealing seat has an axial channel; the sealing seat comprises an annular fin plate, which is located on the inner side of the sealing seat; the diameters of the sealing seat holes on the left and right sides of the annular fin plate are both larger than the inner diameter of the annular fin plate; the right side of the annular fin plate is an annular groove, and the annular groove is provided with an elastic element; The outer side of the main body is provided with the locking device, which is a spiral groove; the spiral groove comprises two sections; the first section extends rightwards along the axial direction of the main body and circumferentially along the main body; the second section continues to extend circumferentially along the main body, and the end of the second section has a hook bend extending leftwards along the axial direction of the main body; In operation, the low-temperature hydrogen recovery device is connected to the interface of the liquid hydrogen storage tank to form a hydrogen recovery channel; the low-temperature hydrogen recovery device comprises a guide pipe, a valve flap, a first spring, a limiting device, the valve flap is sleeved with the first spring, one end of the first spring abuts against the limiting device, and the other end abuts against the outer peripheral step of the valve flap; the outer side of the guide pipe is fixedly provided with a shell, and the shell is provided with a pin shaft, When the low-temperature hydrogen recovery device is connected to the interface, the pin shaft is inserted into the spiral groove, and in the process of connection, the top rod of the valve flap contacts the top rod of the valve core; because the pre-tightening force of the first spring is smaller than the pre-tightening force of the second spring, the valve flap moves leftwards to open the through hole of the guide pipe first, the guide pipe contacts the sealing ring to form the first seal; After the valve flap contacts the limiting device, the valve core moves rightwards, the second spring is compressed, and the main body through hole is opened; the pin shaft continues to slide in the second section of the spiral groove, the right end of the guide pipe abuts against the annular fin plate, the annular fin plate is slightly deformed rightwards, and the elastic element supports the annular fin plate; the pin shaft continues to slide to the hook bend, the right end of the guide pipe still abuts against the annular fin plate, but the annular fin plate returns leftwards and no longer deforms or the deformation is reduced, at this time, the right end of the guide pipe abuts against the annular fin plate to form the second seal.

2. The interface of claim 1, wherein: The valve core comprises left, middle and right three sections; the left section of the valve core is a top rod; the middle section of the valve core has a tapered surface; the right section of the valve core has an axial half through hole, and the second through hole is arranged on the wall of the half through hole; the middle section of the valve core cooperates with the middle section of the main body through hole to close or open the main body through hole.

3. The interface of claim 1, wherein: The inner diameter of the elastic element is consistent with the inner diameter of the annular fin plate.

4. The interface of claim 1, wherein: The right side of the annular groove is provided with a guide hole, and the top rod of the left section of the valve core is inserted into the guide hole.

5. The interface of claim 1, wherein: The utility model further comprises a second pressing ring, which has an axial through hole; the second pressing ring is fixed to the right section of the main body; one end of the second spring abuts against the second pressing ring, and the other end abuts against the valve core.

6. The interface of claim 1, wherein: The elastic element is a non-metallic elastic element.

7. The interface of claim 1, wherein: The utility model further comprises a third pressing ring, which is fixed to the left end of the main body to block the sealing ring and the sealing seat.

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