Liquefied fuel gas steel cylinder valve

Abstract

The utility model provides a liquefied fuel gas steel cylinder valve and relates to the field of liquefied fuel gas steel cylinder valves, a gas inlet cavity, a valve cavity, a valve core cavity and a gas outlet cavity are respectively formed in a valve body, a valve core is arranged in the valve cavity, an overflowing self-closing component is arranged in the gas inlet cavity, a pin cavity is arranged on the side face of the valve cavity, and the pin cavity is communicated with the valve cavity through a push rod channel. The front end of the pin cavity is communicated with the air inlet cavity through an inclined hole, a push rod is slidably arranged in the pin cavity in a sealed mode, the front end of the push rod is slidably connected into a push rod channel in a sealed mode, a gap is reserved between the front end of the push rod and the push rod channel, and in a normal state, the push rod is located at the right end of the pin cavity. According to the liquefied gas steel cylinder valve, the overflowing self-closing assembly is arranged in the gas inlet cavity, overflowing protection is achieved, closing is stopped or the closing state of the overflowing self-closing assembly is relieved through sliding fit of the push rod, and various application scenes of the valve are smoothly completed.

Description

Technical Field

[0001] This utility model relates to the technical field of liquefied gas cylinder valves, specifically a liquefied gas cylinder valve. Background Technology

[0002] According to GB7512-2023 "Liquefied Petroleum Gas Cylinder Valves," to ensure the safety of liquefied petroleum gas cylinder valves, safety devices must be installed inside the valves (Note: Clause 5.7 of the standard allows valves with flow-controlled self-closing mechanisms to not have self-closing devices at the outlet) to ensure that the gaseous passage of the liquefied petroleum gas cylinder valve is leak-proof. Therefore, existing liquefied petroleum gas cylinder valves, such as... Figure 1 As shown, the valve body 1' has a gaseous channel, the lower end of which is a cylinder valve inlet 2' for connecting to a gas cylinder. A cylinder valve outlet 3' is located on the side of the valve body 1' for connecting to the gas cylinder's pressure reducing valve. A self-closing mechanism is installed inside the cylinder valve outlet 3', giving the valve body 1' a self-closing function, allowing gas to be released only when the pressure reducing valve is installed. However, the self-closing mechanism significantly reduces the sealing surface 22', increasing the leakage points connected to the pressure reducing valve. Although there is double protection from the pressure reducing valve, given the widespread use of liquefied petroleum gas (LPG) and the large customer base, especially the elderly, it is necessary to consider the possibility that the pressure reducing valve's leak warning may go unnoticed or ignored. Furthermore, the valve only protects against leaks during transportation and storage, offering no protection during gas usage. Therefore, the LPG cylinder valve can be further improved to enhance valve body safety.

[0003] Therefore, this case proposes a new type of liquefied gas cylinder valve structure to solve the above-mentioned drawbacks. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a liquefied gas cylinder valve, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a liquefied petroleum gas cylinder valve, comprising a valve body, wherein an inlet chamber, a valve chamber, a valve core chamber, and an outlet chamber are respectively formed within the valve body. The end of the inlet chamber is the cylinder valve inlet, connected to the cylinder. The end of the outlet chamber is the cylinder valve outlet, connected to a pressure reducing valve. A valve core is provided within the valve chamber for opening and closing the upper valve port of the valve chamber. An overflow self-closing component is provided inside the inlet chamber. When the liquefied petroleum gas outlet flow rate in the cylinder exceeds a threshold, the overflow self-closing component closes the lower valve port of the valve chamber.

[0006] The valve cavity is provided with a pin cavity, the pin cavity is connected with the valve cavity through a push rod channel, the front end of the pin cavity is connected with the air inlet cavity through an inclined hole, a push rod is sealingly and slidably arranged in the pin cavity, the front end of the push rod is sealingly and slidably connected in the push rod channel, and a gap is left between the front end of the push rod and the push rod channel, in normal state, the push rod is located at the right end of the pin cavity, after the push rod is pushed inward, the over-flow self-closing assembly can be prevented from being closed or the closed state of the over-flow self-closing assembly is released.

[0007] Preferably, a screw sleeve is fixedly arranged in the inner side of the end of the pin cavity, and the push rod is slidably connected in the screw sleeve.

[0008] Preferably, the push rod comprises a front sliding section, a middle sliding section and a rear sliding section, the rear sliding section is slidably connected in the screw sleeve, the middle sliding section is slidably arranged on the inner wall of the pin cavity, and the front sliding section is slidably arranged in the push rod channel, and the middle sliding section and the front sliding section are respectively provided with sealing rings.

[0009] Preferably, the over-flow self-closing assembly comprises a fixing member and a top shaft, the fixing member is provided with a gas flow channel, the fixing member is fixedly arranged on the inner wall of the air inlet cavity, the top shaft is slidably connected on the fixing member, a blocking block is arranged on the upper end of the top shaft, and a spring is arranged between the top shaft and the fixing member, when the outflow of the liquefied gas in the steel cylinder exceeds a threshold value, the blocking block moves upward along with the top shaft to block the valve port at the lower end of the valve cavity.

[0010] Preferably, the valve core comprises a valve rod and an opening valve, the valve rod is engaged in the valve core cavity through a compression nut, the valve rod is connected with the opening valve through a connecting block, the opening valve is provided with a pad block, a hand wheel is arranged on the valve rod, and the valve rod drives the opening valve to move to open or close the valve under the rotation of the hand wheel.

[0011] Preferably, the gas outlet of the bottle valve is provided with an internal thread or an external thread.

[0012] The utility model provides a kind of liquefied gas steel cylinder valve.

[0013] 1. The liquefied gas cylinder valve discards the self-closing mechanism arranged in the bottle valve gas outlet of the traditional valve body, which is limited by the structure of the self-closing mechanism, that is, the matching form of the wire sleeve and the top rod, the sealing surface between the wire sleeve and the pressure reducing valve interface is small, which increases the risk of liquefied petroleum gas leakage, and only ensures the safety of the transportation and storage links, and the safety device is arranged in the bottle valve gas outlet, the sealing surface between the bottle valve gas outlet and the pressure reducing valve interface is large, which improves the sealing performance of the connection between the bottle valve gas outlet and the pressure reducing valve, and in the use and transportation links of the gas cylinder, the safety protection function can be realized as long as the gas flow exceeds the threshold value, a pin cavity is formed on the side of the valve cavity, the pin cavity and the valve cavity are connected through a push rod channel, the front end of the pin cavity is connected with the gas inlet cavity through an inclined hole, a push rod is sealingly and slidably arranged in the pin cavity, the front end of the push rod is sealingly and slidably connected in the push rod channel, and a gap is left between the front end of the push rod and the push rod channel, in normal state, the push rod is located at the right end of the pin cavity, and through the sliding cooperation of the push rod, the over-flow self-closing assembly is prevented from being closed or the closed state of the over-flow self-closing assembly is released, and various applicable scenes of the valve are smoothly completed.

[0014] 2. The safety device of the liquefied gas cylinder valve is an over-flow self-closing assembly, which comprises a fixing piece and a top shaft, the fixing piece is fixedly arranged at the gas inlet of the bottle valve, the top shaft is slidably connected with the fixing piece, and a spring is arranged between the top shaft and the fixing piece, so that when the gas flow of the liquefied gas in the cylinder exceeds the threshold value, the over-flow self-closing assembly closes the valve, and the over-flow protection function is realized. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of an existing liquefied gas cylinder valve;

[0016] Figure 2 It is a structure schematic view of a liquefied gas cylinder valve in a liquid filling or gas filling state according to the present application;

[0017] Figure 3 It is a structure schematic view of a liquefied gas cylinder valve in an over-flow and over-limit gas discharge releasing state according to the present application; (push rod working schematic Figure 1 );

[0018] Figure 4 It is a structure schematic view of a liquefied gas cylinder valve in a closed state according to the present application (over-flow self-closing assembly not triggered state);

[0019] Figure 5 It is a structure schematic view of a liquefied gas cylinder valve in a normal use state according to the present application;

[0020] Figure 6 It is a structure schematic view of a liquefied gas cylinder valve in an over-flow self-closing state according to the present application (over-flow self-closing assembly triggered state);

[0021] Figure 7This is a schematic diagram of the structure of a liquefied gas cylinder valve in the initial state of releasing self-closing.

[0022] Figure 8 for Figure 7 Enlarged view of point A;

[0023] Figure 9 This is a schematic diagram of the reset state structure of an overcurrent self-closing component for a liquefied gas cylinder valve according to this utility model.

[0024] Figure 10 This is a schematic diagram of the valve closed state of a liquefied gas cylinder (liquefied dimethyl ether cylinder) according to this utility model.

[0025] In the diagram: 1. Valve body; 2. Bottle valve inlet; 3. Bottle valve outlet; 4. Inlet chamber; 5. Valve chamber; 6. Valve core chamber; 7. Outlet chamber; 8. Fixing component; 9. Top shaft; 10. Sealing block; 11. Spring; 12. Pin chamber; 13. Screw sleeve; 14. Push rod; 141. Front sliding section; 142. Middle sliding section; 143. Rear sliding section; 15. Sealing ring; 16. Valve stem; 17. Open valve; 18. Connecting block; 19. Pad block; 20. Handwheel; 21. Push rod channel; 22. Sealing surface; 23. Thread below the valve; 24. Compression nut; 25. Threaded sleeve; 26. Top rod; 27. Conical compression spring; 28. Slanted hole. Detailed Implementation

[0026] According to GB / T 7512-2017 "Liquefied Petroleum Gas Cylinder Valves", to ensure the safety of liquefied petroleum gas cylinder valves, safety devices must be installed inside the valves to ensure that the gaseous passage of the valves does not leak. Therefore, existing liquefied petroleum gas cylinder valves, such as... Figure 1 As shown, the device includes a valve body 1', which forms a gas channel. The lower end of the gas channel is a cylinder valve inlet 2' for connecting to a steel cylinder. A cylinder valve outlet 3' is provided on the side of the valve body 1' for connecting to the pressure reducing valve of the steel cylinder. A self-closing mechanism is installed in the cylinder valve outlet 3', so that the valve body 1' has a self-closing function and gas is only released when the pressure reducing valve is installed.

[0027] like Figure 1As shown, the self-closing mechanism inside the conventional valve body 1 includes a threaded sleeve 25 and a push rod 26. The threaded sleeve 25 is connected to the gas outlet 3' of the bottle valve and is sealed by an O-ring 15 and a sealing gasket. The push rod 26 is slidably connected to the threaded sleeve 25. A sealing seat is set at the rear end of the push rod 26, and a sealing gasket is set on the sealing seat. A conical compression spring 27 is set between the rear end of the sealing seat and the valve body 1'. After the valve airtightness test is passed, the threaded sleeve 25 is drilled and riveted. Copper shavings are not allowed to enter the gas outlet. When the pressure reducing valve is not connected, the sealing gasket is pressed against the rear side of the threaded sleeve 25 under the elastic force of the conical compression spring 27, and is in a self-closing state. When the pressure reducing valve is connected, the push rod 26 is pushed back and opened, the sealing gasket is separated from the side of the threaded sleeve 25, and the self-closing state is opened.

[0028] For example Figure 2 The sealing surface 22 is limited by the mating structure of the threaded sleeve 25 and the push rod 26, such as Figure 1 The self-closing mechanism shown has a significantly reduced sealing surface 22, increasing the leakage points connected to the pressure reducing valve. Although there is double protection from the external pressure reducing valve, given the widespread use of liquefied petroleum gas and the large customer base, especially the elderly, it is necessary to consider the possibility that the pressure reducing valve's leak warning may go unnoticed or ignored. Moreover, the protection only applies to the transportation and storage stages and cannot provide protection during gas usage. Therefore, this utility model further improves the traditional liquefied gas cylinder valve to enhance the safety of the valve body 1'.

[0029] This utility model embodiment provides a liquefied gas cylinder valve, such as... Figures 2-10 As shown, the device includes a valve body 1, which has an airflow channel. It is composed of an inlet chamber 4, a valve chamber 5, a valve core chamber 6, and an outlet chamber 7. Blocking any one of the chambers can cut off the airflow channel. Therefore, the safety device that was originally installed in the outlet 3 of the cylinder valve in the traditional valve body 1 is now installed in the inlet 2 of the cylinder valve. The end of the inlet chamber 4 is the inlet 2 of the cylinder valve, which is connected to the cylinder. The end of the outlet chamber 7 is the outlet 3 of the cylinder valve, which is connected to the pressure reducing valve. The valve core is installed in the valve chamber 5, which is used to open and close the upper valve port of the valve chamber 5. The safety device is installed inside the inlet chamber 4. Based on its nature, the safety device in this case is an overcurrent self-closing component. When the liquefied petroleum gas outlet flow rate in the cylinder exceeds the threshold, the overcurrent self-closing component closes the lower valve port of the valve chamber 5.

[0030] The valve cavity 5 is provided with a pin cavity 12 on the side, the pin cavity 12 is communicated with the valve cavity 5 through the push rod channel 21, the front end of the pin cavity 12 is communicated with the air inlet cavity 4 through the inclined hole 28, the push rod 14 is sealingly and slidably arranged in the pin cavity 12, the front end of the push rod 14 is sealingly and slidably connected in the push rod channel 21, and a gap is left between the front end of the push rod 14 and the push rod channel 21. Under normal circumstances, the push rod 14 is located at the right end of the pin cavity 12, and after the push rod 14 is pushed inward, the over-current self-closing assembly can be prevented from being closed or the closed state of the over-current self-closing assembly is released.

[0031] In the above technical solution, the screw sleeve 13 is fixedly arranged in the inner side of the end of the pin cavity 12, and the push rod 14 is slidably connected in the screw sleeve 13.

[0032] Preferably, the push rod 14 comprises a front sliding section 141, a middle sliding section 142 and a rear sliding section 143, the rear sliding section 143 is slidably connected in the screw sleeve 13, the middle sliding section 142 is slidably arranged on the inner wall of the pin cavity 12, and the front sliding section 141 is slidably arranged in the push rod channel 21. In order to improve the sealing performance of the pin cavity 12, the middle sliding section 142 and the front sliding section 141 are respectively provided with sealing rings 15, and the rear sliding section 143 can be provided with double O-shaped sealing rings 15. Due to the stepped shaft of the push rod 14, the push rod 14 cannot be pushed outwards.

[0033] In embodiment one, the over-current self-closing assembly comprises a fixed part 8 and a top shaft 9, the fixed part 8 is provided with a gas flow passage, and the fixed part 8 is fixedly arranged on the inner wall of the air inlet cavity 4. The function of the fixed part 8 is to fixedly connect the over-current self-closing assembly to the air inlet cavity 4, so that the over-current self-closing assembly is integrally installed. The top shaft 9 is slidably connected to the fixed part 8, the top end of the top shaft 9 is provided with a blocking block 10, and the spring 11 is arranged between the top shaft 9 and the fixed part 8. Preferably, the fixed part 8 can be a screw sleeve 13, a threaded hole is provided in the air inlet cavity 4 in advance, and the screw sleeve 13 is threadedly connected to the threaded hole. The top end of the top shaft 9 is provided with a conical platform, the blocking block 10 is sleeved on the top shaft 9 at the lower end of the conical platform, and the blocking block 10 is fixed by using a spring. When the outflow of liquefied petroleum gas in the cylinder exceeds the threshold value, the blocking block 10 moves upward with the top shaft 9, blocks the valve port at the lower end of the valve cavity 5, and the blocking block 10 is preferably a sealing seat.

[0034] In embodiment two, the valve core is existing technology and includes a valve stem 16 and an open valve 17. The valve stem 16 is engaged in the valve core cavity 6 by a clamping nut 24. The valve stem 16 and the open valve 17 are connected by a connecting block 18. A pad 19 is provided under the open valve 17. A handwheel 20 is provided on the valve stem 16. When the handwheel 20 is rotated, the valve stem 16 drives the open valve 17 to move, thereby opening and closing the valve. Its working principle is that rotating the handwheel 20 causes the valve stem 16 to rotate on the stroke screw, which in turn causes the connecting block 18 and the open valve 17 to move up and down, thereby opening and closing the valve.

[0035] This liquefied gas cylinder valve is not limited to use with liquefied petroleum gas, but can also be used with liquefied dimethyl ether, etc. Figures 2-9 As shown, an internal thread is provided for the outlet of the liquefied petroleum gas cylinder valve, such as... Figure 10 The diagram shows the structure of the valve for a liquefied dimethyl ether cylinder, with an external thread at the valve outlet 3.

[0036] Working principle: When the liquefied gas cylinder valve is in use:

[0037] 1. Liquid or gas filling state, such as Figure 2 As shown, the liquefied gas cylinder valve is in the valve filling state: the gas outlet 3 of the cylinder valve is connected to the filling equipment. Turning the handwheel 20 opens the valve, and the filling equipment fills the cylinder with gas through the valve body 1. The sealing block 10 is forced downwards under the gas pressure, and the lower valve port of the valve cavity 5 remains open. Figure 2 As indicated by the arrow, airflow enters the cylinder from the valve;

[0038] 2. When a gas cylinder needs to be vented at excessive flow rate or evacuated after being tested for air tightness with other gases, such as... Figure 3 As shown, the push rod 14 is moved inward, and the front end of the push rod 14 is horizontally placed on the top shaft 9. The airflow flows out from bottom to top, and the push rod 14 blocks the self-closing component from closing.

[0039] 3. Closed state as follows Figure 4 As shown, the gas inlet 2 of the valve body 1 is sealed to the gas cylinder through the special thread of the lower part of the valve. The valve port at the upper end of the valve chamber 5 of the liquefied gas cylinder valve is in the closed state and the overcurrent self-closing open state (not triggered). The push rod 14 is at the right end.

[0040] 4. Normal usage condition as follows Figure 5 As shown, rotating the handwheel 20 causes the valve stem 16 to rotate on the stroke screw, which in turn moves the connecting block 18 and the opening valve 17 upward, thereby opening the valve. As shown by the arrow, the airflow flows out of the gas cylinder and out of the gas outlet chamber 7.

[0041] 5. Valve overcurrent self-closing state, such as... Figure 6As shown, the upper end of the valve cavity 5 is in an open state, when the gas flow exceeds the threshold value, the gas flow drives the blocking block 10 to generate an upward thrust that exceeds the frictional resistance of the spring 11 and the blocking block 10, and moves upward to block the lower end of the valve cavity 5;

[0042] 6. The valve is in a self-closing state, as shown in Figure 7 and Figure 8 As shown, first rotate the hand wheel 20 to close the cylinder valve, push the push rod 14 into the valve body 1, and the sealing ring 15 at the front end of the push rod 14 is in a non-sealed state. The gas in the cylinder passes through the inclined hole 28 and the push rod passage 21 into the valve cavity 5. When the pressure in the valve cavity 5 above and below the blocking block 10 and the inlet cavity 4 is balanced, the top shaft 9 is reset by the spring force of the spring 11, and returns to the state as shown in Figure 9 , the overflow self-closing assembly is reset;

[0043] 7. When it is needed to use again, first pull the push rod 14 out to the right end position, then unscrew the hand wheel 20, open the cylinder valve, and the valve is used normally again. The overflow self-closing assembly is in a non-triggered state again.

[0044] As described above

[0045] 1. The liquefied gas cylinder valve discards the self-closing mechanism of the traditional valve body 1 placed in the cylinder valve gas outlet 3, which is limited by the structure of the self-closing mechanism, that is, the matching form of the silk sleeve 25 and the top rod 26. The small sealing surface 22 of the silk sleeve 25 and the pressure reducing valve interface increases the risk of liquefied petroleum gas leakage. The safety device is arranged in the cylinder valve gas outlet 3, and the sealing surface 22 of the cylinder valve gas outlet 3 and the pressure reducing valve interface is large, which improves the sealing performance of the connection between the cylinder valve gas outlet 3 and the pressure reducing valve. At the same time, a pin cavity 12 is provided on the side of the valve cavity 5, the pin cavity 12 and the valve cavity 5 are connected through the push rod passage 21, the front end of the pin cavity 12 and the inlet cavity 4 are connected through the inclined hole 28, and the push rod 14 is sealingly and slidingly arranged in the pin cavity 12. The front end of the push rod 14 is sealingly and slidingly connected in the push rod passage 21, and a gap is left between the front end of the push rod 14 and the push rod passage 21. Under normal circumstances, the push rod 14 is located at the right end of the pin cavity 12. Through the sliding cooperation of the push rod 14, the closing or closing state of the overflow self-closing assembly is prevented, and the valve is smoothly completed in various applicable scenes.

[0046] 2. The safety device of the liquefied gas cylinder valve is an overflow self-closing assembly, which includes a fixed part 8 and a top shaft 9. The fixed part 8 is fixedly arranged in the cylinder valve gas inlet 2, and the top shaft 9 is slidingly connected to the fixed part 8. A spring 11 is arranged between the top shaft 9 and the fixed part 8, which can close the valve when the gas flow of liquefied petroleum gas in the cylinder exceeds the threshold value, and plays a role in overflow protection.

[0047] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquefied gas cylinder valve, comprising a valve body (1) having a gas inlet cavity (4), a valve cavity (5), a valve core cavity (6) and a gas outlet cavity (7) formed therein respectively, the gas inlet cavity (4) having a cylinder valve gas inlet port (2) at its end connected to a cylinder, the gas outlet cavity (7) having a cylinder valve gas outlet port (3) at its end connected to a pressure reducing valve, the valve cavity (5) having a valve core arranged therein for opening and closing a valve port at the upper end of the valve cavity (5), characterized in that: The gas inlet cavity (4) is internally provided with an overflow self-closing assembly, which closes the lower valve port of the valve cavity (5) when the liquefied gas outlet flow in the cylinder exceeds a threshold value. The valve cavity (5) is provided with a pin cavity (12) on the side, the pin cavity (12) and the valve cavity (5) are connected through a push rod channel (21), the front end of the pin cavity (12) is connected with the gas inlet cavity (4) through an inclined hole (28), a push rod (14) is sealingly and slidably arranged in the pin cavity (12), the front end of the push rod (14) is sealingly and slidably connected in the push rod channel (21), and a gap is left between the front end of the push rod (14) and the push rod channel (21). Normally, the push rod (14) is located at the right end of the pin cavity (12), and after the push rod (14) is pushed inward, the closed or released state of the overflow self-closing assembly can be prevented.

2. A liquefied gas cylinder valve according to claim 1, wherein: The pin cavity (12) is internally provided with a screw sleeve (13).

3. A liquefied gas cylinder valve according to claim 2, wherein: The push rod (14) comprises a front sliding section (141), a middle sliding section (142) and a rear sliding section (143), the rear sliding section (143) is slidably connected in the screw sleeve (13), the middle sliding section (142) is slidably arranged on the inner wall of the pin cavity (12), and the front sliding section (141) is slidably arranged in the push rod channel (21). The middle sliding section (142) and the front sliding section (141) are respectively provided with a sealing ring (15) on the outer circle.

4. A liquefied gas cylinder valve according to claim 3, wherein: The overflow self-closing assembly comprises a fixing member (8) and a top shaft (9), the fixing member (8) is provided with a gas flow passage, and the fixing member (8) is fixedly arranged on the inner wall of the gas inlet cavity (4). The top shaft (9) is slidably connected to the fixing member (8), the top end of the top shaft (9) is provided with a blocking block (10), and the spring (11) is arranged between the top shaft (9) and the fixing member (8). When the liquefied gas outlet flow in the cylinder exceeds a threshold value, the blocking block (10) moves upward with the top shaft (9), and the lower valve port of the valve cavity (5) is blocked.

5. A liquefied gas cylinder valve according to claim 1, wherein: The valve core comprises a valve rod (16) and an open valve (17), the valve rod (16) is engaged in the valve core cavity (6) through a compression nut (24), the valve rod (16) and the open valve (17) are connected through a connecting block (18), the open valve (17) is provided with a pad (19) below, and the valve rod (16) is provided with a hand wheel (20). The valve rod (16) is rotated under the hand wheel (20), and drives the open valve (17) to move to open or close the valve.

6. A liquefied gas cylinder valve according to claim 1, wherein: The cylinder valve gas outlet (3) is provided with internal threads or external threads.

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