Overcurrent self-closing device

Abstract

The utility model relates to the technical field of fluid, and provides an overflowing self-closing device which comprises a first valve body, an overflowing protection assembly and a driving assembly, and the first valve body is provided with a main flow channel and a fluid outlet; the overflowing protection assembly comprises a shell, a valve rod, a first valve element and a first elastic piece, the shell is connected to the main flow channel, a fluid inlet is formed in the shell, and a first sealing opening is formed in the shell; the valve rod can reciprocate in the shell in the axial direction, the valve rod is provided with a first flow guide channel, the first flow guide channel is provided with a first flow passing hole and a second flow passing hole, a sealing component and a second elastic piece are arranged in the first flow guide channel, and the sealing component abuts against the second elastic piece to block the second flow passing hole. The first valve element is connected to the valve rod and used for opening or closing the first sealing opening. The first elastic piece is arranged on the valve rod in a sleeving mode and used for providing reset elastic force for the first valve element. The driving assembly is used for driving the sealing component. Overcurrent protection of liquefied gas can be achieved, liquefied gas leakage is prevented, and safety is improved.

Description

Technical Field

[0001] The present application relates to the field of fluid technology, and in particular provides an over-current self-closing device. Background Art

[0002] Liquefied gas cylinders are mainly used to store liquefied gas, and are connected to gas appliances such as gas stoves through liquefied gas pipelines. In actual use, when liquefied gas pipelines are detached or damaged, a large amount of liquefied gas in the liquefied gas cylinder will leak, posing a high safety risk. Utility Model Content

[0003] The purpose of the embodiment of the present application is to provide an over-current self-closing device, which is intended to solve the problem in the prior art that when the liquefied gas pipeline has abnormal phenomena such as falling off or damage, a large amount of liquefied gas in the liquefied gas cylinder will leak out.

[0004] To achieve the above purpose, the technical solution adopted in this application is:

[0005] The present application provides an overcurrent self-closing device, comprising:

[0006] A first valve body, provided with a main flow channel and a fluid outlet connected to the main flow channel;

[0007] An overcurrent protection assembly comprises a shell, a valve stem, a first valve core and a first elastic member, wherein the shell is connected to an end of the main flow channel away from the fluid outlet, a fluid inlet is provided at an end of the shell away from the fluid outlet, and a first sealing port relative to the fluid inlet is formed in the shell; the valve stem can reciprocate axially in the shell, and the valve stem is provided with a pilot flow channel, a first flow hole is provided at an end of the pilot flow channel adjacent to the fluid inlet, a second flow hole is provided at an end of the pilot flow channel adjacent to the fluid outlet, a sealing component and a second elastic member are provided in the pilot flow channel, and the sealing component abuts against the second elastic member to block the second flow hole; the first valve core is connected to the valve stem and is used to open or close the first sealing port; the first elastic member is sleeved on the valve stem and is used to provide a reset elastic force for the first valve core;

[0008] The driving assembly comprises a driving rod capable of axially reciprocating in the main flow channel, wherein the driving rod is disposed in the housing and is used for driving the sealing component.

[0009] Optionally, a flow guide pipe is connected to one end of the shell adjacent to the first sealing port, the flow guide pipe is connected to the main flow channel, and a second sealing port is provided at one end of the flow guide pipe away from the first sealing port;

[0010] The driving rod is provided with a second valve core, and the second valve core is used to open or close the second sealing port.

[0011] Optionally, the driving assembly further includes:

[0012] A hand wheel, rotatably connected to the first valve body and connected to the driving rod, for driving the driving rod to move so that the second valve core switches between a closed position and an open position;

[0013] In the closed position, at least a portion of the second valve core is embedded in the flow guide tube through the second sealing opening;

[0014] In the open position, the second valve core is separated from the flow guide tube.

[0015] Optionally, the overcurrent self-closing device further includes:

[0016] A second valve body is connected to an end of the first valve body adjacent to the fluid outlet, and an external interface is provided on the side of the second valve body; the hand wheel is connected to a third valve core, and the third valve core is provided in the second valve body and connected to the driving rod;

[0017] In the closed position, the third valve core closes or opens the flow path between the fluid outlet and the external port;

[0018] In the open position, the third valve core opens the flow path between the fluid outlet and the external port.

[0019] Optionally, the housing is provided with a bottom cover, the bottom cover is provided with the fluid inlet and a first guide sleeve, and one end of the valve stem is inserted into the first guide sleeve;

[0020] A bracket is arranged in the guide tube, and the bracket is connected to a second guide sleeve arranged opposite to the first guide sleeve. The other ends of the driving rod and the valve stem are inserted into the second guide sleeve.

[0021] Optionally, the first elastic member is sleeved on the second guide sleeve and the valve stem, and is located between the first valve core and the bracket.

[0022] Optionally, a third elastic member is provided between the second valve core and the bracket, and the third elastic member is sleeved on the driving rod and the second guide sleeve.

[0023] Optionally, the housing comprises a containing chamber, the containing chamber is arranged on a side of the first valve core, and an end of the containing chamber close to the first sealing port is provided with an opening facing the first valve core, and a blocking ball is provided in the containing chamber;

[0024] The over-current self-closing device has an inverted state and an upright state. In the inverted state, the blocking ball flows through the opening to between the first valve core and the first sealing port to prevent the first valve core from closing the first sealing port; in the upright state, the blocking ball flows through the opening to reset into the accommodating chamber.

[0025] Optionally, a blocking ring extending toward the first valve core is formed on the inner edge of the first sealing port, and in the inverted state, the blocking ring is used to block the blocking ball.

[0026] Optionally, a guide plate is provided at the opening of the accommodating chamber, and the guide plate is used to guide the flow of the blocking ball.

[0027] The beneficial effect of the overcurrent self-closing device provided in the present application is that the present application can realize the pressure balance overcurrent protection of liquefied gas through the overcurrent protection component, effectively prevent the leakage of liquefied gas, and improve the safety of liquefied gas use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the structure of an over-current self-closing device provided in an embodiment of the present application;

[0030] Figure 2 A cross-sectional view of the structure of the over-current self-closing device provided in an embodiment of the present application;

[0031] Figure 3 for Figure 2 A local enlarged view of point A;

[0032] Figure 4 One of the schematic diagrams of the internal structure of the housing provided in the embodiment of the present application;

[0033] Figure 5 This is a second schematic diagram of the internal structure of the shell provided in an embodiment of the present application.

[0034] Among them, the reference numerals in the figure are:

[0035] 1. First valve body; 2. Main flow channel; 3. Fluid outlet; 4. Shell; 5. Valve stem;

[0036] 6. first valve core; 7. first elastic member; 8. fluid inlet; 9. first sealing port;

[0037] 10. pilot flow channel; 11. first flow hole; 12. second flow hole; 13. sealing component;

[0038] 14. second elastic member; 15. driving rod; 16. flow guide tube; 17. second sealing port;

[0039] 18. second valve core; 19. bottom cover; 20. first guide sleeve; 21. bracket; 22. second guide sleeve;

[0040] 23. through hole; 24. third elastic member; 25. hand wheel; 26. second valve body; 27. external interface;

[0041] 28. third valve core; 29. ​​external pipe; 30. third guide sleeve; 31. sealing ring; 32. accommodation chamber;

[0042] 33. opening; 34. blocking ball; 35. blocking ring; 36. guide plate; 37. first plate;

[0043] 38. The second plate; 39. The third plate. DETAILED DESCRIPTION

[0044] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0045] In the description of the embodiments of the present application, it needs to be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood 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 the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0047] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] According to one embodiment of the present application, referring to Figure 1-Figure 5 As shown, the present application provides an over-current self-closing device, which mainly includes: a first valve body 1, an over-current protection component and a drive component. Among them, the first valve body 1 is provided with a main flow channel 2 and a fluid outlet 3 connected to the main flow channel 2; the over-current protection component includes a shell 4, a valve stem 5, a first valve core 6 and a first elastic member 7, the shell 4 is connected to the end of the main flow channel 2 away from the fluid outlet 3, the end of the shell 4 away from the fluid outlet 3 is provided with a fluid inlet 8, and a first sealing port 9 relative to the fluid inlet 8 is formed in the shell 4; the valve stem 5 can reciprocate axially in the shell 4, and the valve stem 5 is provided with a pilot flow channel 10, and the end of the pilot flow channel 10 adjacent to the fluid inlet 8 is provided with a first over-flow hole 11, and the pilot flow channel 10 adjacent to the fluid outlet A second flow hole 12 is provided at one end of the valve stem 3, a sealing component 13 and a second elastic component 14 are provided in the pilot flow channel 10, and the sealing component 13 abuts against the second elastic component 14 to block the second flow hole 12; the first valve core 6 is connected to the valve stem 5 and is located between the fluid inlet 8 and the first sealing port 9, and is used to open or close the first sealing port 9; the first elastic component 7 is sleeved on the valve stem 5 and is used to provide a reset elastic force for the first valve core 6; the driving assembly includes a driving rod 15 that can reciprocate axially in the main flow channel 2, the driving rod 15 is penetrated in the housing 4, and is used to drive the sealing component 13.

[0049] In this embodiment of the present application, the first valve body 1 serves as the basic structure of the entire device, and comprises a main flow channel 2 and a fluid outlet 3. It is the main channel for the flow of liquefied gas and is mainly used to connect to an external liquefied gas pipeline.

[0050] In the overcurrent protection assembly, the shell 4 is connected to the lower end of the main flow channel 2, and the fluid inlet 8 of the shell 4 can be connected to the gas outlet of the liquefied gas cylinder. The shell 4 is the core area of ​​the overcurrent protection.

[0051] The valve stem 5 can reciprocate along the axial direction, and the pilot flow channel 10 provided inside is equipped with a first flow hole 11 and a second flow hole 12. The first flow hole 11 can be connected to the gas outlet of the liquefied gas cylinder. The sealing component 13 and the second elastic component 14 are located in the pilot flow channel 10. During normal flow operation, the second elastic component 14 blocks the second flow hole 12 by the sealing component 13, so that the pilot flow channel 10 is in a sealed state to prevent gas from bypassing the first valve core 6 and flowing directly.

[0052] The first valve core 6 is located between the fluid inlet 8 and the first sealing port 9 , and is kept in an open state by the first elastic member 7 , and is mainly used to control the opening and closing of the main flow channel 2 .

[0053] The driving rod 15 of the driving assembly can move axially along the main flow channel 2 and act on the sealing component 13 in the valve stem 5, thereby realizing a reset operation.

[0054] In this example, the sealing component 13 may be a steel ball, and the first elastic member 7 and the second elastic member 14 may be springs.

[0055] Normal working state: under the elastic force of the second elastic member 14, the sealing component 13 closes the second flow hole 12 of the pilot flow channel 10 to ensure that the pilot flow channel 10 is closed. At the same time, the first valve core 6 opens the first sealing port 9 under the resetting elastic force of the first elastic member 7, and the liquefied gas smoothly enters the main flow channel 2 through the fluid inlet 8 and the first sealing port 9 and flows to the gas-using equipment through the fluid outlet 3.

[0056] Overcurrent protection triggering: When an abnormally large flow is detected, such as overcurrent caused by the liquefied gas pipeline falling off or being damaged, the gas flow increases. Under the action of the airflow, the first valve core 6 is pushed to overcome the elastic force of the first elastic member 7 and move in the direction of the airflow until the first sealing port 9 is sealed, immediately cutting off the airflow to prevent further leakage.

[0057] Reset operation: Once the overcurrent protection is activated, the main flow channel 2 is automatically blocked. To restore gas circulation, the driving rod 15 can be controlled to move downward. Through the mechanical force of the driving rod 15, the sealing component 13 in the valve stem 5 is pushed open, and the second flow hole 12 of the pilot flow channel 10 is opened. At this time, the first flow hole 11 is connected to the second flow hole 12, so that the air pressure on both sides of the first valve core 6 is balanced. Subsequently, the reset elastic force of the first elastic member 7 causes the first valve core 6 to move downward and reset, reopening the first sealing port 9, and the main flow channel 2 is opened again, and the device returns to normal working state.

[0058] To summarize, the over-current self-closing device provided in the present application realizes intelligent monitoring and protection of liquefied gas flow through precise mechanical structure design, can respond quickly under abnormal conditions, and effectively avoid safety accidents caused by liquefied gas leakage. At the same time, its reset mechanism ensures that the gas supply can be easily restored after the fault is eliminated, taking into account both safety and practicality.

[0059] According to one embodiment of the present application, referring to Figure 2 As shown, a guide tube 16 is connected to one end of the shell 4 adjacent to the first sealing port 9, the guide tube 16 is threadedly connected to the main channel 2, and a second sealing port 17 is provided at one end of the guide tube 16 away from the first sealing port 9; a second valve core 18 is provided on the driving rod 15, and the second valve core 18 is used to open or close the second sealing port 17.

[0060] Normal working state: During the use of liquefied gas, the sealing component 13 is in a closed state, the first valve core 6 is in an open state, and the second valve core 18 opens the second sealing port 17, allowing the liquefied gas to flow from the fluid inlet 8 through the inside of the housing 4, through the first sealing port 9 and the second sealing port 17 into the main flow channel 2 of the first valve body 1, and out of the fluid outlet 3. At this time, the entire over-current self-closing device maintains normal gas circulation.

[0061] Overcurrent protection triggering: Once abnormal flow is detected (such as a sudden increase in airflow due to pipe detachment or damage), the first valve core 6 is pushed and moves along the airflow direction under the impact force of the airflow until it tightly seals the first sealing port 9, effectively preventing further leakage of liquefied gas and realizing immediate overcurrent protection function.

[0062] Reset operation: After over-current protection occurs, human intervention is required to continue using gas. The driving rod 15 moves downward to push open the sealing component 13 in the valve stem 5, and the pilot flow channel 10 is connected, so that the air pressure on both sides of the first valve core 6 is balanced. Subsequently, under the elastic force of the first elastic member 7, the first valve core 6 moves downward to reset and reopen the first sealing port 9.

[0063] The second valve core 18 moves downward synchronously under the action of the driving rod 15 to close the second sealing port 17 of the flow guide pipe 16. At this time, the entire main flow channel 2 is still in a closed state and will not cause gas leakage. After the liquefied gas pipeline and related equipment are inspected and repaired, they can be opened for normal use again.

[0064] According to one embodiment of the present application, referring to Figure 1 , Figure 3 and Figure 5 As shown, the housing 4 is provided with a bottom cover 19, the bottom cover 19 is provided with a fluid inlet 8 and a first guide sleeve 20, one end of the valve stem 5 is inserted into the first guide sleeve 20; a bracket 21 is provided in the guide tube 16, the bracket 21 is connected to a second guide sleeve 22 arranged opposite to the first guide sleeve 20, and the other end of the driving rod 15 and the valve stem 5 is inserted into the second guide sleeve 22. In addition, the first elastic member 7 is sleeved on the second guide sleeve 22 and the valve stem 5, and is located between the first valve core 6 and the bracket 21.

[0065] A plurality of brackets 21 may be provided, and the plurality of brackets 21 are arranged around the second guide sleeve 22 at intervals, and a through hole 23 is provided between two adjacent brackets 21 for facilitating airflow.

[0066] The present application can guide the movement of the drive rod 15 and the valve stem 5 through the guide sleeve structure, thereby improving stability and reliability.

[0067] According to one embodiment of the present application, referring to Figure 2 As shown, a third elastic member 24 is provided between the second valve core 18 and the bracket 21, and the third elastic member 24 is sleeved on the driving rod 15 and the second guide sleeve 22. In this example, the third elastic member 24 can be a spring.

[0068] According to one embodiment of the present application, referring to Figure 1 and Figure 2 As shown, the drive assembly also includes: a hand wheel 25, which is rotatably connected to the first valve body 1 and connected to the drive rod 15, and is used to drive the drive rod 15 to move so that the second valve core 18 is switched between a closed position and an open position; in the closed position, at least a portion of the second valve core 18 is embedded in the guide tube 16 through the second sealing port 17; in the open position, the second valve core 18 is separated from the guide tube 16.

[0069] It can be understood that, since at least a portion of the second valve core 18 is built into the flow guide tube 16 in the closed position, when it is necessary to switch from the closed position to the open position, the hand wheel 25 needs to be rotated a certain number of times to gradually move the second valve core 18 out of the flow guide tube 16. This design can prevent the second valve core 18 from immediately opening the main flow channel 2 due to a slight rotation of the hand wheel 25, thereby avoiding accidental air leakage.

[0070] For example, when the hand wheel 25 is turned in the opening direction for no more than a preset number of turns (e.g., 0.5 turns), the second valve core 18 is still in the flow guide tube 16, closing the main flow channel 2. Only when the hand wheel 25 is turned for more than the preset number of turns can the second valve core 18 be separated from the flow guide tube 16, opening the main flow channel 2. By setting a specific number of turns as a safety threshold, it is ensured that the second valve core 18 remains in a blocked state, i.e., a closed position, before reaching this rotation range. This design clearly defines the limits of safe operation and reduces the possibility of accidental air leakage.

[0071] The over-current self-closing device of the present application adopts an opening process with a transitional stage, that is, the second valve core 18 needs to rotate a preset number of circles before it can completely disengage from the flow guide tube 16 to achieve the conduction of the main flow channel 2. This design requires the user to consciously and continuously turn the hand wheel 25, rather than just a slight or unintentional touch, thereby greatly reducing the risk of accidental opening of the over-current self-closing device due to misoperation or external force impact.

[0072] Therefore, the overflow self-closing device provided in the embodiment of the present application can effectively solve the problem of accidental opening of liquefied gas cylinders during transportation and storage, and improve the safety of use.

[0073] According to one embodiment of the present application, referring to Figure 1 and Figure 2 As shown, the over-current self-closing device also includes: a second valve body 26, the second valve body 26 is connected to one end of the first valve body 1 adjacent to the fluid outlet 3, and an external interface 27 is provided on the side of the second valve body 26; the hand wheel 25 is connected to a third valve core 28, the third valve core 28 is provided in the second valve body 26, and is connected to the driving rod 15; in the closed position, the third valve core 28 closes or opens the flow path between the fluid outlet 3 and the external interface 27; in the open position, the third valve core 28 opens the flow path between the fluid outlet 3 and the external interface 27.

[0074] Specifically, the third valve core 28 can be connected to the driving rod 15 by means of clamping, threaded connection, integral connection or abutment.

[0075] For example, the third valve core 28 is connected to the drive rod 15 by means of clamping, threaded connection or integral connection. When the handwheel 25 rotates, the third valve core 28 can drive the drive rod 15 and the second valve core 18 to rotate synchronously and move back and forth up and down in the main channel 2.

[0076] For example, the third valve core 28 is in contact with the drive rod 15. When the hand wheel 25 is rotated to close, the third valve core 28 is driven to move downward, thereby squeezing the drive rod 15 and the third elastic member 24 downward, and driving the second valve core 18 to move downward; when the hand wheel 25 is rotated to open, the third valve core 28 is driven to move upward, and the drive rod 15 and the second valve core 18 move upward under the elastic force of the third elastic member 24.

[0077] It can be understood that, in the closed position, if the second valve core 18 is completely embedded in the guide tube 16, blocking the main flow channel 2, the third valve core 28 can simultaneously close the fluid outlet 3, thereby realizing a double insurance mechanism; if the hand wheel 25 is gradually turned to open, the third valve core 28 can first open the fluid outlet 3, but at this time the second valve core 18 is still in the guide tube 16 and has not yet been separated from the guide tube 16, that is, it is still in the closed position, thereby blocking the main flow channel 2. Such a design can prevent the main flow channel 2 from being immediately opened due to an accidental slight rotation of the hand wheel 25, thereby avoiding accidental air leakage.

[0078] When in the open position, the third valve core 28 opens the fluid outlet 3 , and the second valve core 18 is separated from the flow guide tube 16 , thereby opening the main flow channel 2 .

[0079] According to an embodiment of the present application, the third valve core 28 is threadedly connected to the inner wall of the second valve body 26. When the hand wheel 25 is turned, the third valve core 28 can be driven to move up and down in the second valve body 26, thereby controlling the movement of the driving rod 15.

[0080] In this embodiment of the present application, the threaded connection allows the up and down movement distance of the third valve core 28 to be controlled by designing the pitch of the thread, thereby controlling the movement distance of the second valve core 18 and adjusting the position of the second valve core 18. For example, if the thread pitch is 1 mm, the second valve core 18 rises or falls 1 mm for each turn of the hand wheel 25; if the thread pitch is 2 mm, the second valve core 18 rises or falls 2 mm for each turn of the hand wheel 25.

[0081] According to one embodiment of the present application, referring to Figure 1 and Figure 2 As shown, the external interface 27 is connected to an external pipe 29 .

[0082] The embodiment of the present application provides an external pipe 29 so that the over-current self-closing device can be conveniently connected to the liquefied gas pipeline, thereby simplifying the installation process and reducing the installation cost.

[0083] According to one embodiment of the present application, referring to Figure 2 As shown, a third guide sleeve 30 is provided at one end of the main channel 2 close to the fluid outlet 3. The third guide sleeve 30 is located between the second valve core 18 and the fluid outlet 3. The drive rod 15 is inserted into the third guide sleeve 30. The movement of the drive rod 15 is further guided by the third guide sleeve 30 to improve stability.

[0084] In addition, a sealing ring 31 is provided on the outer peripheral wall of the second valve core 18. When the second valve core 18 is embedded in the flow guide tube 16, the sealing ring 31 is squeezed to form a tight sealing interface, which effectively prevents gas leakage when the over-current self-closing device is closed. Even in the face of high pressure or slight deformation caused by long-term use, the elasticity of the sealing ring 31 can ensure a good sealing effect.

[0085] According to one embodiment of the present application, referring to Figure 3-Figure 5 As shown, the housing 4 includes a receiving chamber 32 , which is disposed on the side of the first valve core 6 , and an end of the receiving chamber 32 close to the first sealing port 9 is provided with an opening 33 toward the first valve core 6 , and a blocking ball 34 is provided in the receiving chamber 32 .

[0086] It can be understood that the shell 4 includes an installation space for accommodating structures such as the valve stem 5, the first valve core 6 and the first elastic member 7, and a accommodating chamber 32 for accommodating the blocking ball 34. The accommodating chamber 32 is arranged on the side of the installation space and is connected to the installation space through an opening 33.

[0087] The specific type of the blocking ball 34 of the present application is not particularly limited, and it can be, for example, a spherical component such as a steel ball.

[0088] The over-current self-closing device has an inverted state and an upright state. In the inverted state, the blocking ball 34 flows through the opening 33 to between the first valve core 6 and the first sealing port 9, and is used to prevent the first valve core 6 from closing the first sealing port 9; in the upright state, the blocking ball 34 flows through the opening 33 and is reset to the accommodating chamber 32.

[0089] It can be understood that, in the upright state, the overcurrent protection component is at the bottom of the first valve body 1, such as Figure 2 As shown; on the contrary, the inversion is Figure 2 The entire arrangement is shown reversed through 180°.

[0090] Specifically, when the use of the liquefied gas cylinder is nearing the end and the residual liquefied gas in the cylinder needs to be extracted, the suction device is connected to the external pipe 29. The negative pressure generated by the suction may cause the first valve core 6 to move to the first sealing port 9 for sealing, affecting the extraction efficiency.

[0091] Therefore, when residual gas extraction is required, that is, residual gas in the gas cylinder is extracted, or when the overcurrent protection function is not required in other cases, the entire device can be turned upside down, and the blocking ball 34 automatically moves to between the first valve core 6 and the first sealing port 9 under the action of gravity to form a physical barrier. This effectively prevents the first sealing port 9 from closing, thereby ensuring that the liquefied gas can be discharged smoothly to meet the residual gas extraction requirements.

[0092] When the overcurrent self-closing device returns to the upright state, the blocking ball 34 naturally slides back into the accommodation chamber 32 under the action of gravity, and no longer interferes with the normal operation of the first valve core 6. At this time, if the abnormal airflow increases, the first valve core 6 can quickly move to the first sealing port 9 under the action of the airflow pressure to block it, prevent gas leakage, restore the overcurrent protection function, and ensure safety in use.

[0093] Therefore, the embodiment of the present application introduces a blocking ball 34 and its matching accommodating chamber 32 structure, so that the overcurrent self-closing device can adapt to different usage scenarios, and especially adds the ability to temporarily disable the overcurrent protection function in specific circumstances (such as residual extraction operations) without affecting its normal safety protection mechanism.

[0094] According to one embodiment of the present application, referring to Figure 3 and Figure 5 As shown, a blocking ring 35 extending toward the first valve core 6 is formed on the inner edge of the first sealing opening 9 . In the inverted state, the blocking ring 35 is used to block the blocking ball 34 .

[0095] In this embodiment of the present application, the blocking ring 35 is additionally provided on the inner edge of the first sealing opening 9, and its design purpose is to provide a precise limit point for the blocking ball 34 when the device is inverted. In this way, in the inverted state, when the blocking ball 34 slides down onto the first valve core 6 under the action of gravity, it will be blocked by the blocking ring 35 and stay accurately at the position between the first valve core 6 and the first sealing opening 9, instead of sliding randomly, thereby ensuring the relative smoothness of the main flow channel 2.

[0096] Through the positioning effect of the blocking ring 35, the blocking ball 34 is restricted to a position that does not affect most of the area of ​​the first sealing port 9, thereby reducing the obstruction to the gas flow. This is particularly important for residual extraction operations, because it requires that the gas can flow out smoothly while not activating the overcurrent protection mechanism, thereby improving the residual extraction efficiency.

[0097] According to one embodiment of the present application, referring to Figure 3 As shown, a guide plate 36 is provided at the opening 33 of the accommodating chamber 32 , and the guide plate 36 is used to guide the flow of the blocking ball 34 .

[0098] In this embodiment of the present application, the guide plate 36 is designed to guide the moving path of the blocking ball 34 when switching between the inverted and upright positions. In the inverted state, the guide plate 36 prompts the blocking ball 34 to slide quickly and accurately along the guide path to between the first valve core 6 and the blocking ring 35, ensuring that the switching of the overcurrent protection function is completed in a short time.

[0099] Similarly, when the overcurrent protection function needs to be restored, that is, when it is upright, the guide plate 36 can also ensure that the blocking ball 34 returns quickly and unimpeded to the accommodating chamber 32. This design reduces the delay or jamming that may occur due to the natural fall back due to gravity, thereby improving work efficiency and reliability.

[0100] For example, refer to Figure 3-Figure 5 As shown, a first plate 37 , a second plate 38 and a third plate 39 are provided in the shell 4 , and a receiving chamber 32 is enclosed between the first plate 37 , the second plate 38 , the third plate 39 and the shell 4 .

[0101] The third plate 39 has an opening 33 on its upper portion facing the first valve core 6 , and a guide plate 36 is provided on its top end. In the upright state, the guide plate 36 is tilted downward, and the top end of the guide plate 36 is higher than the first valve core 6 .

[0102] With such a design, the blocking ball 34 can be stably clamped between the blocking ring 35 and the first valve core 6 in the inverted state. In addition, the specific height difference between the top of the guide plate 36 and the first valve core 6 can be designed according to actual needs to ensure that the blocking ball 34 can automatically flow back to the accommodating chamber 32 when switching from the inverted state to the upright state.

[0103] According to one embodiment of the present application, referring to Figure 3-Figure 5 As shown, the number of the accommodation chambers 32 is at least two, and the accommodation chambers 32 are arranged at intervals along the circumference of the first valve core 6. In this example, the number of the accommodation chambers 32 is three.

[0104] In this embodiment of the present application, each accommodation chamber 32 can accommodate at least one blocking ball 34, and the design of multiple accommodation chambers 32 means that multiple blocking balls 34 can be deployed. When placed upright or inverted, multiple blocking balls 34 work together, which can not only distribute the force more evenly, but also improve the resistance of the overcurrent self-closing device to abnormal conditions and enhance the overall mechanical stability.

[0105] A single blocking ball 34 may have problems such as wear and sticking that may affect its function. However, by adopting a design with multiple accommodating chambers 32 and blocking balls 34, even if a problem occurs with an individual blocking ball 34, the other blocking balls 34 can still function normally, thereby greatly improving reliability and reducing the risk of failure due to single point failure.

[0106] In addition, multiple accommodating chambers 32 are arranged at intervals along the circumference of the first valve core 6. When in an upright position, these accommodating chambers 32 and the blocking balls 34 therein will not cause significant obstruction to the normal airflow; in an inverted state, the blocking balls 34 are evenly distributed around the first sealing port 9, which can open the main flow channel 2 more evenly and stably, ensure unobstructed airflow, and at the same time reduce direct obstruction to the first sealing port 9, thereby optimizing the control accuracy and efficiency of the airflow.

[0107] According to one embodiment of the present application, referring to Figure 3 and Figure 4 As shown, the number of the blocking balls 34 in each accommodation chamber 32 is at least two, and each blocking ball 34 is arranged along the height direction of the housing 4 .

[0108] In this embodiment of the present application, at least two blocking balls 34 are arranged in each accommodating chamber 32. When the overflow self-closing device is in an inverted state, these blocking balls 34 work together to more firmly block the first valve core 6 from moving toward the first sealing port 9. Even if the blocking ball 34 in front fails to fully fall into place for some reason, the subsequent blocking ball 34 can provide additional thrust to make it fall into place, thereby ensuring unimpeded airflow and improving reliability.

[0109] The above are only preferred embodiments of the present application and are not intended to limit the embodiments of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. An overcurrent self-closing device, characterized in that: include: A first valve body, provided with a main flow channel and a fluid outlet connected to the main flow channel; An overcurrent protection assembly comprises a shell, a valve stem, a first valve core and a first elastic member, wherein the shell is connected to an end of the main flow channel away from the fluid outlet, a fluid inlet is provided at an end of the shell away from the fluid outlet, and a first sealing port relative to the fluid inlet is formed in the shell; the valve stem can reciprocate axially in the shell, and the valve stem is provided with a pilot flow channel, a first flow hole is provided at an end of the pilot flow channel adjacent to the fluid inlet, a second flow hole is provided at an end of the pilot flow channel adjacent to the fluid outlet, a sealing component and a second elastic member are provided in the pilot flow channel, and the sealing component abuts against the second elastic member to block the second flow hole; the first valve core is connected to the valve stem and is used to open or close the first sealing port; the first elastic member is sleeved on the valve stem and is used to provide a reset elastic force for the first valve core; The driving assembly comprises a driving rod capable of axially reciprocating in the main flow channel, wherein the driving rod is disposed in the housing and is used for driving the sealing component.

2. The overcurrent self-closing device according to claim 1, characterized in that: A flow guide pipe is connected to one end of the housing adjacent to the first sealing opening, the flow guide pipe is connected to the main flow channel, and a second sealing opening is provided at one end of the flow guide pipe away from the first sealing opening; The driving rod is provided with a second valve core, and the second valve core is used to open or close the second sealing port.

3. The overcurrent self-closing device according to claim 2, characterized in that: The drive assembly also includes: A hand wheel, rotatably connected to the first valve body and connected to the driving rod, for driving the driving rod to move so that the second valve core switches between a closed position and an open position; In the closed position, at least a portion of the second valve core is embedded in the flow guide tube through the second sealing opening; In the open position, the second valve core is separated from the flow guide tube.

4. The overcurrent self-closing device according to claim 3, characterized in that: The overcurrent self-closing device also includes: A second valve body is connected to an end of the first valve body adjacent to the fluid outlet, and an external interface is provided on the side of the second valve body; the hand wheel is connected to a third valve core, and the third valve core is provided in the second valve body and connected to the driving rod; In the closed position, the third valve core closes or opens the flow path between the fluid outlet and the external port; In the open position, the third valve core opens the flow path between the fluid outlet and the external port.

5. The overcurrent self-closing device according to claim 2, characterized in that: The housing is provided with a bottom cover, the bottom cover is provided with the fluid inlet and a first guide sleeve, and one end of the valve stem is inserted into the first guide sleeve; A bracket is arranged in the guide tube, and the bracket is connected to a second guide sleeve arranged opposite to the first guide sleeve. The other ends of the driving rod and the valve stem are inserted into the second guide sleeve.

6. The overcurrent self-closing device according to claim 5, characterized in that: The first elastic member is sleeved on the second guide sleeve and the valve stem, and is located between the first valve core and the bracket.

7. The overcurrent self-closing device according to claim 5, characterized in that: A third elastic member is provided between the second valve core and the bracket, and the third elastic member is sleeved on the driving rod and the second guide sleeve.

8. The overcurrent self-closing device according to any one of claims 1 to 7, characterized in that: The housing comprises a containing chamber, the containing chamber is arranged on the side of the first valve core, and an end of the containing chamber close to the first sealing port is provided with an opening facing the first valve core, and a blocking ball is arranged in the containing chamber; The over-current self-closing device has an inverted state and an upright state. In the inverted state, the blocking ball flows through the opening to between the first valve core and the first sealing port to prevent the first valve core from closing the first sealing port. In the upright state, the blocking ball flows through the opening and returns to the accommodation chamber.

9. The overcurrent self-closing device according to claim 8, characterized in that: A blocking ring extending toward the first valve core is formed on the inner edge of the first sealing port. In the inverted state, the blocking ring is used to block the blocking ball.

10. The overcurrent self-closing device according to claim 8, characterized in that: A guide plate is provided at the opening of the accommodating chamber, and the guide plate is used to guide the flow of the blocking ball.

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