Natural gas cylinder valve structure

Abstract

The utility model relates to a natural gas cylinder valve structure which comprises a cylinder valve body, the cylinder valve body is provided with a gas inlet / outlet, a gas injection port and a safety relief port, the cylinder valve body is further provided with a manual switch assembly, the gas inlet / outlet is communicated with the gas injection port, and the manual switch assembly can control the communication state of the gas inlet / outlet and the gas injection port through a valve assembly. The gas injection port is communicated with the safety discharge port; the gas cylinder valve body is provided with at least two gas inlet and outlet ports, gas inlet and outlet channels are formed in the positions, located at the gas inlet and outlet ports, in an inner cavity of the gas cylinder valve body, and gas injection channels are formed in the positions, located at the gas injection ports, in the inner cavity of the gas cylinder valve body. The technical scheme is reasonable, the strength of the gas cylinder valve body can be enhanced while the discharge flow is guaranteed, and the gas cylinder valve is suitable for occasions with higher pressure intensity.

Description

Technical Field

[0001] The utility model relates to a valve body structure, in particular to a natural gas cylinder valve body structure. Background Art

[0002] A natural gas cylinder is a high-pressure container for storing compressed natural gas. Such a high-pressure container containing flammable and explosive gas is a pressure container with explosive danger. Therefore, when filling natural gas, a special natural gas cylinder valve must be used. However, the natural gas cylinder valve of the traditional structure still has a series of problems in actual use. First, a steel ball is often used in the inner cavity of the valve body structure of the traditional structure to achieve the purpose of opening and closing the gas circuit, but the steel ball is difficult to accurately control due to its own reasons. During long-term use, the steel ball is easy to displace, thereby causing safety accidents. The valve body structure disclosed in Chinese patent 201420089927.2 vehicle compressed natural gas cylinder valve does not use a steel ball, but there are still problems in use. For example, when the pressure and temperature of the gas cylinder are too high during use, the pressure must be relieved through the valve body, but the pressure relief pipeline of the valve body is small, and the pressure relief process is bound to be prolonged, affecting safety. At the same time, the inlet and outlet gas structure of the valve body is also relatively simple, and it cannot be adjusted according to actual conditions during actual use. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a natural gas cylinder valve structure, including a cylinder valve body, the cylinder valve body having a gas inlet and outlet, a gas injection port and a safety discharge port, the cylinder valve body also having a manual switch assembly, the gas inlet and outlet are connected with the gas injection port, the manual switch assembly can control the connection state of the gas inlet and outlet and the gas injection port through a valve assembly, and the gas injection port is connected with the safety discharge port;

[0004] The gas cylinder valve body has at least two gas inlets and outlets, an inlet and outlet flow channel is opened in the inner cavity of the gas cylinder valve body at each gas inlet and outlet, an injection flow channel is opened in the inner cavity of the gas cylinder valve body at the gas injection port, and the gas inlets and outlets are connected with the gas injection ports through the inlet and outlet flow channel and the injection flow channel;

[0005] There is at least one safety discharge outlet flow channel in the inner cavity of the gas cylinder valve body at the safety discharge port. The gas injection channel and the safety discharge outlet flow channel are both connected to the natural gas cylinder, and the gas injection port and the safety discharge port are connected through the natural gas cylinder.

[0006] Preferably, the inner cavity of the gas cylinder valve body is provided with a valve assembly movable cavity, the inlet and outlet air passages and the injection air passages are respectively connected to the valve assembly movable cavity, the valve assembly is movably arranged in the valve assembly movable cavity, and the valve assembly can respectively achieve blocking cooperation with the inlet and outlet air passages and the injection air passages;

[0007] The gas cylinder valve body is located at the front end of the movable cavity of the valve assembly, and a manual switch assembly movable cavity connected to the valve assembly is opened. The manual switch assembly is movably arranged in the movable cavity of the manual switch assembly and is transmission-connected to the valve assembly, that is, the manual switch assembly can drive the valve assembly to respectively achieve blocking cooperation with the inlet and outlet airflow channels and the injection airflow channels.

[0008] Preferably, the left and right ends of the gas cylinder valve body are respectively provided with a safety relief port and a movable cavity of a manual switch assembly, the front and rear ends of the gas cylinder valve body are respectively provided with two oppositely arranged gas inlet and outlet ports, the lower end of the gas cylinder valve body is provided with a gas filling operation end that matches the natural gas cylinder, the gas injection channel extends from the inner cavity of the gas cylinder valve body to the end face of the gas filling operation end, at least one safety relief gas flow channel extends from the inner cavity of the gas cylinder valve body to the end face of the gas filling operation end, and the two inlet and outlet gas flow channels are arranged in a T shape with the gas injection channel.

[0009] Preferably, the gas filling operation end is located on the side of the gas injection channel and has three safety discharge gas flow channels, and the three safety discharge gas flow channels are all connected to the safety discharge port.

[0010] Preferably, the three safety discharge air flow passages are arranged in a ring shape along the circumferential direction, and the three safety discharge air flow passages are arranged at intervals at the end surface of the gas filling operation end, and are arranged to intersect and overlap at the safety discharge port.

[0011] Preferably, the gas injection flow passage of the gas filling operation end is connected to the natural gas cylinder via a flow limiting device.

[0012] Preferably, the manual switch assembly includes a handwheel, a hexagonal nut, a valve stem assembly and a valve stem guide sleeve. The valve stem guide sleeve is fixedly mounted on the outer periphery of the valve stem assembly. One end of the valve stem assembly is fixedly connected to the handwheel via a hexagonal nut, and the other end of the valve stem assembly is fixedly connected to the valve assembly. The valve assembly and the valve stem guide sleeve are respectively threadedly matched with the inner cavity walls of the movable cavity of the valve assembly and the movable cavity of the manual switch assembly.

[0013] Preferably, the safety bolt is threadedly installed in the safety relief port and is provided with a safety plate arranged in series with the safety bolt. A flat washer is provided between the safety plate and the safety relief port. The inner cavity of the safety bolt is provided with a fusible alloy block matching with the safety plate. The side wall of the safety bolt is provided with at least one pressure relief hole connected with the outside world, and the fusible alloy block extends from the inner cavity of the safety bolt into the pressure relief hole.

[0014] By means of the above solution, the utility model has at least the following advantages:

[0015] The technical solution of the present application can ultimately control the switching action between the gas inlet and outlet and the gas injection port through the manual switch assembly, and the manual switch assembly itself and the main body of the gas cylinder valve are ultimately connected by threaded fit. Such a structure can ensure that the manual switch assembly itself can still be guaranteed not to be displaced even in a high-intensity motion state, thereby ensuring the reliability of gas inlet and outlet;

[0016] Furthermore, the two inlet and outlet gas flow passages and the gas injection passage of the technical solution of the present application are arranged in a T-shape. Such a structure enables the main body of the gas cylinder valve to have two relatively arranged inlet and outlet ports. In this way, in actual use, the functions of the two inlet and outlet ports can be adjusted according to the needs of the on-site conditions. The two inlet and outlet ports can be used for both inlet and outlet, or for inlet on one side and outlet on the other side, so that the valve body can be used for various occasions.

[0017] Furthermore, the technical solution of the present application has three safety discharge flow channels, and at the same time, when the three safety discharge flow channels are finally located at the safety discharge port, they can intersect and merge to form a large hole structure. Such a structure can not only maximize the instantaneous flow of the discharge flow channel, but also, compared with directly opening a "large hole" alone, it can avoid the diameter of the hole being too large, which ultimately affects the overall thickness of the gas cylinder valve body itself, and then affects the safety during use. While ensuring the discharge flow, the strength of the gas cylinder valve body itself can be enhanced, which is suitable for occasions with higher pressure.

[0018] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following is a brief introduction to the drawings required for use in the embodiment. It should be understood that the following drawings only show a certain embodiment of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a natural gas cylinder valve structure of the present application;

[0021] Figure 2 It is a cross-sectional structural schematic diagram of a natural gas cylinder valve structure of the present application;

[0022] Figure 3 It is a schematic diagram of the structural relationship between the inlet and outlet flow channels, the injection flow channels and the safety discharge flow channels of the present application;

[0023] Figure 4 It is a schematic diagram of the structural relationship between the main body, hand wheel and safety bolt of the gas cylinder valve of the present application.

[0024] In the figure: 1 cylinder valve body, 2 gas inlet and outlet, 3 gas injection port, 4 safety relief port, 5 inlet and outlet flow channel, 6 gas injection channel, 7 safety relief flow channel, 8 valve assembly active cavity, 9 valve assembly, 10 manual switch assembly active cavity, 11 gas filling operation end, 12 flow limiting device, 13 hand wheel, 14 hexagonal nut, 15 valve stem assembly, 16 valve stem guide sleeve, 17 safety bolt, 18 safety plate, 19 flat washer, 20 fusible alloy block, 21 pressure relief hole. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] See also Figure 1 to Figure 4 A natural gas cylinder valve structure according to a preferred embodiment of the utility model comprises a cylinder valve body 1, the cylinder valve body 1 having a gas inlet and outlet 2, a gas injection port 3 and a safety discharge port 4, the cylinder valve body 1 also having a manual switch assembly, the gas inlet and outlet 2 being connected to the gas injection port 3, the manual switch assembly being able to control the connection state of the gas inlet and outlet 2 and the gas injection port 3 through a valve assembly 9, the gas injection port 3 being connected to the safety discharge port 4;

[0027] When in use, natural gas can be finally injected into the natural gas cylinder through the gas inlet and outlet 2 and the gas injection port 3, and when pressure relief is required, the gas in the natural gas cylinder can directly reach the outside of the cylinder valve body 1 through the safety relief port 4.

[0028] The gas cylinder valve body 1 has at least two gas inlets and outlets 2. An inlet and outlet flow channel 5 is opened in the inner cavity of the gas cylinder valve body 1 at each gas inlet and outlet 2. An injection flow channel 6 is opened in the inner cavity of the gas cylinder valve body 1 at the injection port 3. The gas inlets and outlets 2 and the injection port 3 are connected through the inlet and outlet flow channel 5 and the injection flow channel 6.

[0029] There is at least one safety discharge flow channel 7 at the safety discharge port 4 in the inner cavity of the gas cylinder valve body 1, the gas injection channel 6 and the safety discharge flow channel 7 are both connected to the natural gas cylinder, and the gas injection port 3 and the safety discharge port 4 are connected through the natural gas cylinder.

[0030] Preferably, the inner cavity of the gas cylinder valve body 1 is provided with a valve assembly movable cavity 8, the inlet and outlet air passages 5 and the injection air passages 6 are respectively connected to the valve assembly movable cavity 8, the valve assembly 9 is movably arranged in the valve assembly movable cavity 8, and the valve assembly 9 can respectively achieve blocking cooperation with the inlet and outlet air passages 5 and the injection air passages 6;

[0031] The cylinder valve body 1 is located at the front end of the movable cavity 8 of the valve assembly and is provided with a manual switch assembly movable cavity 10 connected thereto. The manual switch assembly is movably arranged in the manual switch assembly movable cavity 10 and is transmission-connected to the valve assembly 9, that is, the manual switch assembly can drive the valve assembly 9 to respectively achieve blocking cooperation with the inlet and outlet airflow channels 5 and the injection airflow channel 6.

[0032] Preferably, the left and right ends of the gas cylinder valve body 1 respectively have a safety relief port 4 and a manual switch assembly active cavity 10, the front and rear ends of the gas cylinder valve body 1 respectively have two oppositely arranged gas inlet and outlet ports 2, the lower end of the gas cylinder valve body 1 has a gas filling operation end 11 that matches the natural gas cylinder, the injection flow channel 6 extends from the inner cavity of the gas cylinder valve body 1 to the end face of the gas filling operation end 11, at least one safety relief flow channel 7 extends from the inner cavity of the gas cylinder valve body 1 to the end face of the gas filling operation end 11, and the two inlet and outlet flow channels 5 and the injection flow channel 6 are arranged in a T shape.

[0033] The above structure can realize the purpose of gas inlet and outlet on both sides of the gas cylinder valve body 1, and at the same time, the movable cavity 8 of the valve assembly can be located at the intersection of the three gas flow channels, so that the opening and closing can be directly controlled at the intersection through the valve assembly 9.

[0034] Preferably, the gas filling operation end 11 is located on the side of the gas injection channel 6 and has three safety discharge gas flow channels 7 , and the three safety discharge gas flow channels 7 are all connected to the safety discharge port 4 .

[0035] Preferably, the three safety discharge air outlet passages 7 are arranged in a ring shape along the circumferential direction, and the three safety discharge air outlet passages 7 are arranged at intervals at the end surface of the gas filling operation end 11 and intersect and overlap at the safety discharge port 4 .

[0036] The axis of each safety discharge airflow channel 7 is inclined relative to the axis of the gas filling operation end 11. The final state is that the lower ends of the three safety discharge airflow channels 7 are separated and the upper ends are gathered and merged, which not only ensures the strength of the valve body itself and avoids the problem of too thin side walls, but also the three safety discharge airflow channels 7 work together to greatly increase the flow rate and ensure the discharge strength.

[0037] Preferably, the gas injection flow channel 6 of the gas filling operation end 11 is connected to the natural gas cylinder via a flow limiting device 12 .

[0038] Preferably, the manual switch assembly includes a handwheel 13, a hexagonal nut 14, a valve stem assembly 15 and a valve stem guide sleeve 16. The valve stem guide sleeve 16 is fixedly mounted on the outer periphery of the valve stem assembly 15. One end of the valve stem assembly 15 is fixedly connected to the handwheel 13 through the hexagonal nut 14. The other end of the valve stem assembly 15 is fixedly connected to the valve assembly 9. The valve assembly 9 and the valve stem guide sleeve 16 are respectively threadedly matched with the inner cavity walls of the valve assembly active cavity 8 and the manual switch assembly active cavity 10.

[0039] It is worth mentioning that when the handwheel 13 rotates, it can simultaneously drive the valve stem guide sleeve 16 and the valve assembly 9 to rotate to achieve opening and closing. At the same time, the valve stem guide sleeve 16 and the valve assembly 9 are respectively matched with the inner cavity thread of the gas cylinder valve body 1. The double-stage thread matching can further ensure the accuracy of the opening and closing stroke of the manual switch assembly, making it convenient for the operator to control the flow rate of gas injection and gas outlet. At the same time, such a structure can also ensure that the manual switch assembly itself will not be displaced during use, avoiding the occurrence of accidents.

[0040] Preferably, the safety bolt 17 is threadedly installed in the safety discharge port 4, and further has a safety plate 18 arranged in series with the safety bolt 17, and a flat washer 19 is further provided between the safety plate 18 and the safety discharge port 4. The inner cavity of the safety bolt 17 has a fusible alloy block 20 that matches the safety plate 18, and the side wall of the safety bolt 17 has at least one pressure relief hole 21 connected to the outside, and the fusible alloy block 20 extends from the inner cavity of the safety bolt 17 to the pressure relief hole 21.

[0041] The safety bolt 17 and the safety plate 18 are arranged in series, the fusible alloy block 20 is made of HPB59-1+110℃ fusible alloy, and the safety plate 18 is made of nickel-based alloy. When the pressure inside the natural gas cylinder simultaneously meets the requirements of 30MPa~33MPa and the temperature is 110±5℃, the safety plate 18 and the fusible alloy block 20 can be broken at the same time, and the pressure relief action is realized through the pressure relief hole 21.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A natural gas cylinder valve structure, comprising a cylinder valve body (1), the cylinder valve body (1) having a gas inlet and outlet (2), a gas injection port (3) and a safety discharge port (4), and the cylinder valve body (1) also having a manual switch assembly, characterized in that: The air inlet and outlet (2) are connected to the air injection port (3); the manual switch assembly can control the connection state between the air inlet and outlet (2) and the air injection port (3) through the valve assembly (9); the air injection port (3) is connected to the safety discharge port (4); The gas cylinder valve body (1) has at least two gas inlets and outlets (2); an inlet and outlet flow channel (5) is opened in the inner cavity of the gas cylinder valve body (1) at each gas inlet and outlet (2); an injection flow channel (6) is opened in the inner cavity of the gas cylinder valve body (1) at the injection port (3); the gas inlets and outlets (2) and the injection port (3) are connected via the inlet and outlet flow channel (5) and the injection flow channel (6); At least one safety discharge outlet gas passage (7) is provided in the inner cavity of the gas cylinder valve body (1) at the safety discharge port (4); the gas injection passage (6) and the safety discharge outlet gas passage (7) are both connected to the natural gas cylinder; and the gas injection port (3) and the safety discharge port (4) are connected via the natural gas cylinder.

2. A natural gas cylinder valve structure according to claim 1, characterized in that: The inner cavity of the gas cylinder valve body (1) is provided with a valve assembly movable cavity (8); the inlet and outlet air passages (5) and the injection air passages (6) are respectively connected to the valve assembly movable cavity (8); the valve assembly (9) is movably arranged in the valve assembly movable cavity (8); and the valve assembly (9) can respectively achieve blocking cooperation with the inlet and outlet air passages (5) and the injection air passages (6); The cylinder valve body (1) is located at the front end of the valve assembly movable cavity (8) and is provided with a manual switch assembly movable cavity (10) which is in communication with the valve assembly. The manual switch assembly is movably arranged in the manual switch assembly movable cavity (10) and is transmission-connected to the valve assembly (9), that is, the manual switch assembly can drive the valve assembly (9) to respectively achieve blocking cooperation with the inlet and outlet air passages (5) and the injection air passages (6).

3. A natural gas cylinder valve structure according to claim 1 or 2, characterized in that: The left and right ends of the gas cylinder valve body (1) are respectively provided with a safety relief port (4) and a manual switch assembly movable cavity (10); the front and rear ends of the gas cylinder valve body (1) are respectively provided with two oppositely arranged gas inlet and outlet ports (2); the lower end of the gas cylinder valve body (1) is provided with a gas filling operation end (11) matched with a natural gas cylinder; an injection gas passage (6) extends from the inner cavity of the gas cylinder valve body (1) to the end face of the gas filling operation end (11); at least one safety relief gas outlet passage (7) extends from the inner cavity of the gas cylinder valve body (1) to the end face of the gas filling operation end (11); and the two inlet and outlet gas passages (5) and the injection gas passage (6) are arranged in a T-shape.

4. A natural gas cylinder valve structure according to claim 3, characterized in that: The gas filling operation end (11) is located on the side of the gas injection channel (6) and has three safety discharge gas flow channels (7), and the three safety discharge gas flow channels (7) are all connected to the safety discharge port (4).

5. A natural gas cylinder valve structure according to claim 4, characterized in that: The three safety discharge gas flow passages (7) are arranged in a ring shape along the circumferential direction, and the three safety discharge gas flow passages (7) are arranged at intervals at the end surface of the gas filling operation end (11) and intersect and overlap at the safety discharge port (4).

6. A natural gas cylinder valve structure according to claim 3, characterized in that: The gas injection flow channel (6) of the gas filling operation end (11) is connected to the natural gas cylinder via a flow limiting device (12).

7. A natural gas cylinder valve structure according to claim 1 or 2, characterized in that: The manual switch assembly comprises a handwheel (13), a hexagonal nut (14), a valve stem assembly (15) and a valve stem guide sleeve (16). The valve stem guide sleeve (16) is fixedly mounted on the outer periphery of the valve stem assembly (15). One end of the valve stem assembly (15) is fixedly connected to the handwheel (13) via the hexagonal nut (14). The other end of the valve stem assembly (15) is fixedly connected to the valve assembly (9). The valve assembly (9) and the valve stem guide sleeve (16) are respectively threadedly engaged with the inner cavity walls of the valve assembly movable cavity (8) and the manual switch assembly movable cavity (10).

8. A natural gas cylinder valve structure according to claim 1 or 2, characterized in that: The safety bolt (17) is threadedly mounted in the safety discharge port (4) and further comprises a safety plate (18) arranged in series with the safety bolt (17). A flat washer (19) is further provided between the safety plate (18) and the safety discharge port (4). The inner cavity of the safety bolt (17) comprises a fusible alloy block (20) matched with the safety plate (18). The side wall of the safety bolt (17) comprises at least one pressure relief hole (21) communicating with the outside. The fusible alloy block (20) extends from the inner cavity of the safety bolt (17) to the pressure relief hole (21).

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