Quick connector for liquefied gas

Abstract

The utility model relates to the technical field of liquefied gas, and discloses a quick connector for liquefied gas, which comprises a valve body, a shell, a plurality of clamping pieces and a shell elastic piece, one end of the valve body in the first direction is provided with a male head butt joint end used for being connected with a male head, the circumferential wall of the male head butt joint end is provided with a plurality of clamping channels extending in the radial direction of the male head butt joint end, the clamping pieces penetrate through the clamping channels in a one-to-one correspondence mode, and the outer shell is arranged on the periphery of the male head butt joint end in a sliding and sleeving mode. A clamping part and a containing groove are arranged on the inner circumferential wall of the shell, the shell and the valve body are connected through the shell elastic piece, and the shell elastic piece can drive the shell to move from the releasing position to the clamping position. The quick connector can be automatically butted and locked with the male connector, sliding abrasion between the quick connector and the male connector is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of liquefied gas technology, and in particular to a quick connector for liquefied gas. Background Technology

[0002] Currently, in the field of chemical loading and unloading, especially in the replenishment of high-pressure gases such as liquefied petroleum gas, the traditional connection method between the female and male connectors uses two cam handles to achieve clamping through cam pressing, while simultaneously squeezing the piston-type sealing ring in the female connector to achieve a seal. Although this design had some practicality in early applications, its shortcomings have gradually become apparent with the development of technology.

[0003] First, the connection between the female and male connectors relies on two manually operated cam handles to make the cams and the arc-shaped groove of the male connector come into contact and rub against each other to lock them together. As a result, during use, the friction and wear between the two cams and the male connector become increasingly serious, making the seal prone to failure and leading to leakage. This seriously affects the service life and safety of the connector.

[0004] Secondly, since each of the two cam handles is fixed by only one pin, the stress is concentrated and is prone to breakage under high pressure conditions, leading to connection failure and posing a serious safety hazard.

[0005] In addition, due to its structural design limitations, the handle has safety hazards such as misoperation during use, which can easily lead to sealing failure or abnormal separation in actual work, resulting in gas leakage and even causing safety accidents.

[0006] Therefore, there is an urgent need to design a safer and more reliable quick connector for high-pressure gases. Utility Model Content

[0007] The purpose of this invention is to design a safer and more reliable quick connector for high-pressure gas.

[0008] To achieve the above objectives, this utility model provides a quick connector for liquefied gas, comprising: a valve body, a housing, a housing elastic element, and multiple snap-fit ​​elements;

[0009] The valve body has a male connector end for connecting with a male connector at one end in the first direction. The peripheral wall of the male connector end has multiple locking channels extending radially therefrom. Each locking element is correspondingly inserted into each locking channel. The outer shell is slidably sleeved on the outer periphery of the male connector end. The inner peripheral wall of the outer shell has a locking part and a receiving groove. The outer shell and the valve body are connected by the outer shell elastic element. The outer shell elastic element can drive the outer shell to move from the release position to the locking position.

[0010] When the outer shell is in the release position, the receiving groove is correspondingly arranged with the snap-fit ​​channel, and the snap-fit ​​member is located in the snap-fit ​​channel and the receiving groove; when the outer shell is in the snap-fit ​​position, the snap-fit ​​part is correspondingly arranged with the snap-fit ​​channel, and the snap-fit ​​part abuts against the snap-fit ​​member so that the snap-fit ​​member protrudes from the inner peripheral wall of the male connector end.

[0011] Furthermore, the cross-sectional area of ​​the snap-fit ​​channel gradually decreases from the outside to the inside along the radial direction of the male connector end, and the maximum cross-sectional area of ​​the snap-fit ​​component along the radial direction of the male connector end is greater than the minimum cross-sectional area of ​​the snap-fit ​​channel.

[0012] Furthermore, the snap-fit ​​component is a sphere.

[0013] Furthermore, the outer peripheral wall of the valve body has a protruding mounting portion, and the outer shell elastic element is a spring, which is connected to the valve body through the mounting portion.

[0014] Furthermore, the receiving groove is located on the side of the snap-fit ​​portion away from the mounting portion along the first direction, and when the housing is in the release position, the housing elastic element is in a compressed state.

[0015] Furthermore, the outer peripheral wall of the male connector is also provided with a housing abutment portion. When the housing is in the snap-fit ​​position, the side of the housing close to the male connector along the first direction abuts against the housing abutment portion.

[0016] Furthermore, a positioning step is provided on the inner peripheral wall of the valve body, and the positioning step has a positioning surface facing the male connector mating end and used to abut against the male connector.

[0017] Furthermore, it also includes an interface sealing ring, which is disposed on the inner peripheral wall of the male connector end and located between the snap-fit ​​channel and the positioning step.

[0018] Furthermore, it also includes a valve core, a handle, and a control component. The valve body has a device connection end for connecting to a pipeline at one end opposite to the male connector in a first direction. The valve body also has a connecting section connecting the male connector and the device connection end. A valve port is provided between the male connector and the connecting section. The valve core moves along the first direction and passes through the connecting section, and the end of the valve core near the male connector in the first direction is defined as a sealing end. The control component is located inside the connecting section. The handle is located outside the valve body and is drively connected to the valve core through the control component. By controlling the handle, the valve core can be switched between an open position and a closed position. When the valve core is in the open position, the male connector, the valve port, the connecting section, and the device connection end are sequentially connected to form a connecting channel. When the valve core is in the closed position, the sealing end is sealed to the valve port to block the connecting channel.

[0019] Furthermore, it also includes a main shaft, which passes through the peripheral wall of the connecting section, with one end of the main shaft connected to the handle and the other end connected to the control component. By rotating the handle, the main shaft can be driven to rotate along its axial direction, thereby driving the control component to rotate and causing the valve core to switch between the open position and the closed position.

[0020] Compared with the prior art, the quick connector for liquefied gas according to this embodiment of the utility model has the following advantages:

[0021] The quick connector for liquefied gas in this embodiment of the invention adopts a snap-fit ​​and housing clamping mechanism design, which can realize automatic docking and locking with the male connector, avoid sliding wear on the male connector during use, and improve the service life of the male connector and valve body. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of a quick connector for liquefied gas according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of a quick connector for liquefied gas according to an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the quick connector for liquefied gas and the male connector connected in the snap-fit ​​position according to an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional view of the quick connector and male connector for liquefied gas in the release position according to an embodiment of the present invention.

[0026] In the diagram, 1 is the valve body; 10 is the connecting channel; 11 is the male connector end; 111 is the snap-fit ​​channel; 12 is the connecting section; 13 is the equipment connection end; 14 is the mounting part; 15 is the housing abutment part; 16 is the positioning step; 161 is the positioning surface; 17 is the valve port; 2 is the housing; 21 is the snap-fit ​​part; 22 is the receiving groove; 3 is the snap-fit ​​component; 41 is the housing elastic component; 42 is the interface sealing ring; 5 is the valve core; 51 is the sealing end; 6 is the handle; 7 is the control component; 8 is the spindle; 100 is the male connector; x is the first direction. Detailed Implementation

[0027] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this invention, terms such as "first" and "second" are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0031] Reference Figures 1-4 A quick connector for liquefied gas according to an embodiment of the present invention includes: a valve body 1, a housing 2, a snap-fit ​​component 3, and a housing elastic component 41;

[0032] The valve body 1 has a male connector end 11 for connecting with the male connector 100 at one end in the first direction x. The peripheral wall of the male connector end 11 has a snap-fit ​​channel 111 extending radially therein. The snap-fit ​​member 3 passes through the snap-fit ​​channel 111. The outer shell 2 is slidably sleeved on the outer periphery of the male connector end 11. The inner peripheral wall of the outer shell 2 has a snap-fit ​​part 21 and a receiving groove 22. The outer shell 2 and the valve body 1 are connected by the outer shell elastic member 41. The outer shell elastic member 41 can drive the outer shell 2 to move from the release position to the snap-fit ​​position.

[0033] When the outer shell 2 is in the release position, the receiving groove 22 is correspondingly arranged with the snap-fit ​​channel 111, and the snap-fit ​​member 3 is located in the snap-fit ​​channel 111 and the receiving groove 22; when the outer shell 2 is in the snap-fit ​​position, the snap-fit ​​part 21 is correspondingly arranged with the snap-fit ​​channel 111, and the snap-fit ​​part 21 abuts against the snap-fit ​​member 3 so that the snap-fit ​​member 3 protrudes relative to the inner peripheral wall of the male connector end 11.

[0034] This application employs a locking mechanism design between the snap-fit ​​component 3 and the outer shell 2, enabling automatic docking and locking with the male connector 100. This avoids sliding wear on the male connector 100 during use, improving the service life of both the male connector 100 and the valve body 1. When connection is required, the outer shell 2 is manually pulled axially along the valve body 1 to overcome the elastic force of the outer shell elastic element 41 and move to the release position. At this time, the receiving groove 22 corresponds to the snap-fit ​​channel 111, with part of the snap-fit ​​component 3 located within the snap-fit ​​channel 111 and part within the receiving groove 22, not protruding from the inner circumferential wall of the male connector mating end 11. The male connector 100 from the liquefied gas cylinder can then be inserted into the male connector mating end 11. After insertion, the outer shell 2 is released, and under the action of the outer shell elastic element 41, the outer shell 2 automatically moves to the snap-fit ​​position. At this time, the snap-fit ​​part 21 is correspondingly set with the snap-fit ​​channel 111. The snap-fit ​​part 21 squeezes the snap-fit ​​member 3, so that the snap-fit ​​member 3 protrudes from the inner peripheral wall of the male connector end 11 and abuts against the inserted male connector 100, holding the male connector 100 tightly, and realizing the quick connection between the male connector 100 and the female connector.

[0035] When disconnection is required, manually pull the outer casing 2 again to move it to the release position. At this time, the receiving groove 22 is aligned with the snap-fit ​​channel 111, the snap-fit ​​3 retracts and no longer protrudes from the inner peripheral wall of the male connector end 11, and the male connector 100 can be pulled out from the male connector end 11.

[0036] In a specific embodiment of this application, multiple snap-fit ​​channels 111 are provided, all extending radially along the valve body 1. The multiple snap-fit ​​channels 111 are arranged at intervals along the circumference of the valve body 1. The number of snap-fit ​​pieces 3 is the same as that of the snap-fit ​​channels 111, and each snap-fit ​​piece 3 is correspondingly provided in each snap-fit ​​channel 111.

[0037] This application is easy to operate; quick connection and disconnection can be achieved by sliding the outer casing 2 without the need for tools, making it simple, convenient, and time-saving. Furthermore, the connection is reliable; the contact force between the snap-fit ​​part 3 and the male connector 100 is substantial, ensuring a strong and reliable connection that is not easily loosened. At the same time, the structure of this application is simple, easy to manufacture and maintain, and has a low cost.

[0038] In some improvements of this application, the cross-sectional area of ​​the snap-fit ​​channel 111 gradually decreases from the outside to the inside along the radial direction of the male connector end 11, and the maximum cross-sectional area of ​​the snap-fit ​​member 3 along the radial direction of the male connector end 11 is greater than the minimum cross-sectional area of ​​the snap-fit ​​channel 111. This structural arrangement makes the longitudinal section of the snap-fit ​​channel 111 conical, which can prevent the snap-fit ​​member 3 from moving stably within the snap-fit ​​channel 111 during use and prevent it from detaching from the interior of the male connector end 11.

[0039] In some improvements of this application, the snap-fit ​​element 3 is a sphere. In specific implementations, the snap-fit ​​element 3 can be a steel ball with a smooth surface and good rolling performance. The spherical snap-fit ​​element 3 can roll freely within the snap-fit ​​channel 111, thereby better adapting to the movement trajectory of the male connector 100 when it is inserted into and disengaged from the male connector mating end 11, reducing frictional resistance. In other improvements of this application, the snap-fit ​​element 3 can also be a protruding structure of other shapes.

[0040] In some improvements of this application, the outer peripheral wall of the valve body 1 has a protruding mounting portion 14, and the outer shell elastic element 41 is a spring, which is connected to the valve body 1 through the mounting portion 14. Specifically, the mounting portion 14 can be an annular boss located on the outer peripheral wall of the valve body 1, near the male connector end 11. The outer shell elastic element 41 (spring) is sleeved on the male connector end 11, with one end abutting against the end face of the mounting portion 14 and the other end abutting against the inner wall of the outer shell 2.

[0041] The design of the mounting part 14 allows the outer shell elastic element 41 to be connected to the valve body 1 more stably, preventing the spring from shifting or falling off during compression and extension, thereby ensuring that the outer shell 2 can reliably move between the release position and the snap-fit ​​position.

[0042] In some improvements of this application, the receiving groove 22 is located on the side of the snap-fit ​​portion 21 facing away from the mounting portion 14 along the first direction x. When the housing 2 is in the release position, the housing elastic element 41 is in a compressed state. Specifically, the receiving groove 22 and the snap-fit ​​portion 21 are arranged sequentially along the axial direction on the inner peripheral wall of the housing 2, with the receiving groove 22 closer to the end of the male connector 11. When the housing 2 is manually pulled along the first direction x to move it to the release position, the housing elastic element 41 is further compressed, storing more elastic potential energy, thereby providing a greater thrust after the housing 2 is released, allowing the housing 2 to quickly move to the snap-fit ​​position. This design ensures that the housing elastic element 41 is always in a pre-compressed state, guaranteeing that it can provide sufficient thrust in a timely manner, improving the response speed and reliability of the quick connector.

[0043] In other improvements of this application, the receiving groove 22 may also be located on the side of the snap-fit ​​portion 21 away from the mounting portion 14 along the first direction x. When the housing 2 is in the release position, the housing elastic member 41 is in a stretched state. When the housing 2 is manually pulled away from the first direction x to move it to the release position, the housing elastic member 41 is stretched. After the housing 2 is released, the housing elastic member 41 restores its deformation and the housing 2 returns to the snap-fit ​​position.

[0044] In some improvements of this application, a housing abutment portion 15 is further protruding from the outer peripheral wall of the male connector end 11. When the housing 2 is in the snap-fit ​​position, the side of the housing 2 closest to the male connector end 11 along the first direction x abuts against the housing abutment portion 15. Specifically, the housing abutment portion 15 can be an annular boss located on the outer peripheral wall of the male connector end 11, near the end of the male connector end 11. When the housing 2 moves to the snap-fit ​​position under the action of the housing elastic member 41, the end face of the housing 2 abuts tightly against the end face of the housing abutment portion 15 to limit the axial movement of the housing 2 in the snap-fit ​​position, preventing excessive movement of the housing 2 from causing the connection between the snap-fit ​​member 3 and the male connector 100 to loosen, thereby improving the reliability and stability of the connection.

[0045] In some improvements of this application, a positioning step 16 is provided on the inner peripheral wall of the valve body 1. The positioning step 16 has a positioning surface 161 facing the male connector end 11 and used to abut against the male connector 100. Specifically, the positioning step 16 can be an annular protrusion located on the inner peripheral wall of the valve body 1, close to the male connector end 11. The positioning surface 161 is the end face of the positioning step 16 facing the male connector end 11, and its function is to limit the depth of insertion of the male connector 100 into the male connector end 11 and ensure the position of the male connector 100 within the male connector end 11.

[0046] The positioning step 16 ensures that the male connector 100 is always in the correct position after connection, thereby guaranteeing that the snap-fit ​​part 3 can accurately mate with the slot on the male connector 100, improving the reliability and stability of the connection. At the same time, the positioning step 16 also prevents the male connector 100 from being over-inserted, avoiding damage to the internal sealing structure of the valve body 1.

[0047] In some improvements of this application, an interface sealing ring 42 is also included. The interface sealing ring 42 is disposed on the inner peripheral wall of the male connector end 11 and located between the snap-fit ​​channel 111 and the positioning step 16. The interface sealing ring 42 can be an O-ring or other type of sealing ring, embedded in an annular groove on the inner peripheral wall of the male connector end 11. The interface sealing ring 42 is positioned between the snap-fit ​​channel 111 and the positioning step 16. When the male connector 100 is inserted into the male connector end 11, the interface sealing ring 42 makes tight contact with the outer peripheral wall of the male connector 100, forming a reliable seal to prevent liquefied gas leakage. The design of the interface sealing ring 42 further improves the sealing performance of the quick connector and ensures safety after connection.

[0048] In some improvements of this application, a valve core 5, a handle 6, and a control component 7 are also included. The valve body 1 has a device connection end 13 for connecting to a pipeline at one end facing away from the male connector end 11 in the first direction x. The valve body 1 also has a connecting section 12 connecting the male connector end 11 and the device connection end 13. A positioning step 16 is disposed between the male connector end 11 and the connecting section 12, and the inner peripheral wall of the positioning step 16 encloses and defines a valve port 17. The valve core 5 moves along the first direction x through the connecting section 12, and the valve core 5 moves along the first direction x closer to the male connector. One end of the mating end 11 is defined as a sealing end 51. The control element 7 is located inside the connecting section 12. The handle 6 is located outside the valve body 1 and is connected to the valve core 5 via the control element 7. By controlling the handle 6, the valve core 5 can be switched between an open position and a closed position. When the valve core 5 is in the open position, the male mating end 11, the valve port 17, the connecting section 12, and the equipment connecting end 13 are sequentially connected to form a connecting channel 10. When the valve core 5 is in the closed position, the sealing end 51 is sealed to the valve port 17 to block the connecting channel 10.

[0049] The working principle of this application is as follows: 1) Insert the male connector 100 into the male connector mating end 11, and the quick connector will automatically engage. 2) Rotate the handle 6, which will drive the valve core 5 to the open position via the control component 7. The male connector mating end 11, valve port 17, connecting section 12, and equipment connection end 13 will be connected in sequence, allowing liquefied gas to flow from the male connector mating end 11 to the equipment connection end 1316. 3) Rotate the handle 6, which will drive the valve core 5 to the closed position via the control component 7. The sealing end 51 will be sealed to the valve port 17, blocking the connection channel 10 and stopping the flow of liquefied gas. 4) Disconnection: Rotate the handle 6 to the closed position, and then pull the outer casing 2 to disconnect from the male connector 100.

[0050] In some improvements of this application, a main shaft 8 is also included. The main shaft 8 passes through the peripheral wall of the connecting section 12, and one end of the main shaft 8 is connected to the handle 6 and the other end is connected to the control component 7. By rotating the handle 6, the main shaft 8 can be driven to rotate along its axial direction, so as to drive the control component 7 to rotate and switch the valve core 5 between the open position and the closed position.

[0051] Specifically, the control element 7 can be an eccentric wheel, with the tail end of the valve core 5 in contact with the eccentric wheel. When the handle 6 is turned, the main shaft 8 drives the eccentric wheel to rotate, and the eccentric action of the eccentric wheel pushes the valve core 5 to move axially, thereby switching the valve core 5 between the open and closed positions. In another embodiment, the end of the control element 7 can also have a hook portion, and the valve core 5 has a guide wheel corresponding to the hook portion. By rotating the hook portion and driving the guide wheel, the valve core 5 can be switched between the open and closed positions.

[0052] In summary, this utility model embodiment provides a quick connector for liquefied gas, which has the following advantages:

[0053] 1. Reliable connection and sealing: The connection between the quick-connect structure and the male connector 100 is stable and not easy to loosen, with good sealing performance, effectively preventing liquefied gas leakage and improving safety; the positioning step 16 ensures the position of the male connector 100 and protects the internal sealing structure, while the outer shell abutment part 15 restricts the movement of the outer shell 2 and ensures connection stability.

[0054] 2. Simple and quick operation: It can be quickly connected and disconnected without tools, which is simple to operate and improves work efficiency; the snap-fit ​​part 3 adopts a ball or arc surface design to reduce friction and facilitate insertion and removal.

[0055] 3. Integrated on / off control: The on / off control function of liquefied gas is realized through valve core 5 and handle 6, eliminating the need for additional valve installation, simplifying the pipeline system, reducing costs, and improving operational convenience.

[0056] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A quick coupling for liquefied gas, characterized in that, The utility model relates to a valve body, a shell, a shell elastic member and a plurality of clamping members. The valve body is provided with a male head butt joint end for connecting with a male head at one end in a first direction, a plurality of clamping channels extending in the radial direction of the male head butt joint end are formed in the peripheral wall of the male head butt joint end, each clamping member is correspondingly arranged in each clamping channel, the shell is sleeved on the outer periphery of the male head butt joint end, a clamping portion and a receiving groove are formed in the inner peripheral wall of the shell, the shell and the valve body are connected through the shell elastic member, and the shell elastic member can drive the shell to move from a release position to a clamping position. When the shell is located at the release position, the receiving groove is arranged correspondingly with the clamping channel, and the clamping member is located in the clamping channel and the receiving groove; when the shell is located at the clamping position, the clamping portion is arranged correspondingly with the clamping channel, and the clamping portion abuts against the clamping member to make the clamping member protrude relative to the inner peripheral wall of the male head butt joint end. The cross-sectional area of the clamping channel gradually decreases from the outside to the inside in the radial direction of the male head butt joint end, and the maximum cross-sectional area of the clamping member in the radial direction of the male head butt joint end is greater than the minimum cross-sectional area of the clamping channel.

2. The quick coupling for liquefied gas according to claim 1, wherein, The clamping member is a sphere.

3. The quick coupling for liquefied gas according to claim 1, wherein The peripheral wall of the valve body is provided with a mounting portion, the shell elastic member is a spring, and the shell elastic member is connected with the valve body through the mounting portion.

4. The quick coupling for liquefied gas as claimed in claim 1, wherein, The receiving groove is located on the side of the clamping portion away from the mounting portion in the first direction, and the shell elastic member is in a compressed state when the shell is located at the release position.

5. Quick coupling for liquefied gas according to claim 4, characterized in that, The peripheral wall of the male head butt joint end is further provided with a shell abutting portion, and the side of the shell close to the male head butt joint end in the first direction abuts against the shell abutting portion when the shell is located at the clamping position.

6. Quick coupling for liquefied gas according to claim 5, characterized in that, The inner peripheral wall of the valve body is provided with a positioning step, and the positioning step has a positioning surface facing the male head butt joint end and abutting against the male head.

7. The quick coupling for liquefied gas as claimed in claim 1, wherein, An interface sealing ring is further arranged on the inner peripheral wall of the male head butt joint end and located between the clamping channel and the positioning step.

8. Quick coupling for liquefied gas according to claim 7, characterized in that, A valve core, a handle and a control member are further included, one end of the valve body away from the male head butt joint end in the first direction is provided with a device connecting end for connecting with a pipeline, the valve body further has a connecting section connecting the male head butt joint end and the device connecting end, a valve port is further arranged between the male head butt joint end and the connecting section, the valve core is arranged in the connecting section and moves in the first direction, one end of the valve core close to the male head butt joint end in the first direction is defined as a sealing end, the control member is arranged in the connecting section, and the handle is arranged outside the valve body and is drivingly connected with the valve core through the control member.

9. Quick coupling for liquefied gas according to any one of claims 2 to 8, characterized in that, The valve core can be switched between an open position and a closed position by controlling the handle, the male head butt joint end, the valve port, the connecting section and the device connecting end are sequentially connected to form a connecting channel when the valve core is located at the open position, and the sealing end and the valve port are in airtight connection to block the connecting channel when the valve core is located at the closed position. ​ 10. Quick coupling for liquefied gas according to claim 9, characterized in that, The utility model also comprises a main shaft, the main shaft is arranged in the circumferential wall of the connecting section, one end of the main shaft is connected with the handle, the other end is connected with the control piece, the handle can drive the main shaft to rotate along the axial direction, and the control piece is driven to rotate to switch the valve core between the opening position and the closing position.

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