High-pressure gas stop valve

Abstract

The utility model relates to the technical field of stop valve, the utility model provides a high pressure gas stop valve, first valve body is equipped with the air inlet channel, second valve body is below first valve body and is connected with first valve body, and first valve body and second valve body form the installation space, and the installation space is communicated with air inlet channel, and second valve body has the air inlet, airflow channel and air outlet that communicate in proper order, piston valve rod has the plugging section and the reducing section that set up in proper order along the axial direction, and piston valve rod moves down, and the reducing section slides into airflow channel, makes the reducing section outer wall and airflow channel form annular airflow gap, and high pressure gas enters the air inlet and is to air outlet through annular airflow gap, adopts the structure design of low pressure gas drive piston valve rod, need not manual operation, and the response speed is fast, can satisfy the quick regulation and control demand of high pressure gas flow in the automatic production, and simultaneously simplifies the overall structure, reduced the manufacturing cost, improved the operation reliability under the high pressure environment.

Description

Technical Field

[0001] This utility model relates to the field of shut-off valve technology, specifically to a high-pressure gas shut-off valve. Background Technology

[0002] In the petroleum, chemical, and energy industries, high-pressure gas shut-off valves are key control components that ensure the safe and stable operation of systems. They are mainly used to achieve rapid on / off control of the medium in high-pressure gas pipelines.

[0003] Currently, existing high-pressure gas shut-off valves have many limitations in practical applications. Some valves are manually operated, which is not only cumbersome and laborious to operate, but also has a slow response speed, making it difficult to meet the needs of rapid regulation of high-pressure gas flow in automated production. Some electrically or pneumatically driven shut-off valves, although capable of remote control, have complex structures and many internal transmission components, which not only increases manufacturing costs but also reduces the reliability of the valves in high-pressure environments, making them prone to control failure due to component wear or malfunction.

[0004] Meanwhile, the sealing structure of traditional gate valves is poorly designed, and their sealing performance is prone to decline under long-term high-pressure gas impact, often resulting in gas leakage. This not only wastes energy but may also cause safety accidents. In addition, most gate valves have fixed connections between the valve body and internal components such as the valve stem. When internal components are worn or damaged, the entire valve must be disassembled and replaced, making maintenance difficult and costly. Utility Model Content

[0005] To overcome the above-mentioned defects, the embodiments of this utility model provide a high-pressure gas shut-off valve, which solves the technical problems of slow manual drive response of shut-off valves, complex structure of electric or start-up shut-off valves, and gas leakage under high pressure.

[0006] According to one aspect, at least one embodiment of the present invention provides a high-pressure gas shut-off valve, comprising:

[0007] A first valve body, wherein an air inlet channel for introducing low-pressure gas is provided on the first valve body;

[0008] The second valve body is located below the first valve body and is detachably connected to the first valve body. An installation space is formed between the first valve body and the second valve body. The installation space is connected to the air intake channel. The second valve body has an air intake port, an air flow channel and an air outlet connected in sequence.

[0009] A piston valve rod is slidably disposed within the mounting space, and the piston valve rod can move downward along the mounting space under the push of low-pressure gas;

[0010] The piston valve rod is inserted into the airflow channel. The piston valve rod has a sealing section and a reducing section arranged sequentially along the axial direction. After the piston valve rod moves down, the reducing section can slide into the airflow channel so that an annular airflow gap is formed between the outer wall of the reducing section and the airflow channel. The high-pressure gas entering through the air inlet flows to the air outlet through the airflow channel and the airflow gap.

[0011] Optional, also includes:

[0012] A return spring is sleeved on the piston valve rod. One end of the return spring abuts against the second valve body, and the other end abuts against the top surface of the piston valve rod. After the low-pressure gas in the intake channel disappears, the return spring is used to drive the piston valve rod to move upward and reset.

[0013] Optionally, the second valve body includes:

[0014] A sealing seat is detachably mounted on the second valve body. The sealing seat has an installation through hole and is sleeved on the piston valve rod through the installation through hole. The sealing seat abuts against the top end of the return spring away from the piston valve rod. The sealing seat is used to support the return spring. The airflow channel is located below the sealing seat.

[0015] Optionally, the second valve body is provided with an installation groove, the installation groove is connected to the installation space, a sealing ring is provided in the installation groove, the top surface of the sealing ring abuts against the bottom of the sealing seat, the sealing ring is slidably sleeved with the piston valve rod, and the bottom of the inner ring of the sealing ring has a sloping conical surface.

[0016] The piston valve rod has a tapered protruding inclined surface at the connection between the blocking section and the reduced diameter section. The tapered surface can abut against the tapered protruding inclined surface, and the abutment between the tapered surface and the tapered protruding inclined surface can block the airflow channel, so that the air inlet is disconnected from the annular airflow gap.

[0017] Optionally, the installation space is divided into a first cavity and a second cavity, the piston valve stem is divided into a piston end and a valve stem portion, and the sealing section and the diameter reduction section are both located in the valve stem portion.

[0018] Optionally, the bottom of the second valve body has a pressure relief port, which is connected to the second cavity.

[0019] Optionally, the first valve body and the second valve body are threaded together.

[0020] Optionally, the piston valve stem includes:

[0021] The first sealing ring is sleeved on the outer peripheral wall of the valve stem portion, and the outer peripheral wall of the first sealing ring abuts against the inner wall of the mounting through hole.

[0022] Optionally, the piston end of the piston valve stem is detachably connected to the valve stem portion.

[0023] Optionally, the piston valve stem further includes:

[0024] The second sealing ring is disposed on the piston end, and the outer peripheral wall of the second sealing ring abuts against the inner peripheral wall of the first valve body.

[0025] The beneficial effects of this utility model are as follows:

[0026] This invention employs a low-pressure gas-driven piston valve stem design, eliminating the need for manual operation, providing rapid response, and meeting the demands of automated production for quick control of high-pressure gas flow. It also simplifies the overall structure, reduces manufacturing costs, minimizes potential failure points, and improves operational reliability under high-pressure conditions. The piston valve stem achieves sealing and flow switching through the cooperation of a sealing section and a reducing section. The sealing section blocks high-pressure gas flow, ensuring sealing performance in non-operating states and reducing the risk of gas leakage. The annular airflow gap formed by the reducing section and the airflow channel allows for smooth high-pressure gas flow, reducing damage to the valve body from airflow impact. The first and second valve bodies are detachably connected. When internal components such as the piston valve stem show wear or damage, the valve body can be easily disassembled for replacement and maintenance without requiring complete valve disassembly, extending the overall service life of the device. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0028] Figure 1 This is a schematic diagram of the shut-off valve in one embodiment of the present invention;

[0029] Figure 2 for Figure 1 A cross-sectional view at point AA in the embodiment;

[0030] Figure 3 for Figure 2 Enlarged view of a section at point B in the middle;

[0031] Figure 4 for Figure 1A schematic diagram of the piston valve rod in the embodiment.

[0032] In the diagram: 1. First valve body; 101. Inlet passage; 2. Second valve body; 201. Inlet; 202. Outlet; 203. Airflow passage; 204. Installation space; 2041. First cavity; 2042. Second cavity; 205. Pressure relief port; 206. Mounting groove; 21. Return spring; 22. Sealing seat; 2201. Mounting through hole; 3. Piston valve stem; 301. Annular airflow gap; 31. Piston end; 32. Valve stem section; 321. Sealing section; 322. Reduction section; 3221. Conical protrusion slope; 33. First sealing ring; 34. Second sealing ring; 4. Sealing ring; 41. Sloping conical surface. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0034] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0035] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] like Figures 1-4 As shown, a high-pressure gas shut-off valve according to an embodiment of the present invention is illustrated, including a first valve body 1, a second valve body 2, and a piston valve rod 3; the first valve body 1 is provided with an inlet channel 101 for low-pressure gas to enter; the second valve body 2 is located below the first valve body 1, and the first valve body 1 is detachably connected, forming an installation space 204 between the first valve body 1 and the second valve body 2, the installation space 204 being connected to the inlet channel 101, and the second valve body 2 having an inlet 201, an airflow channel 203, and an outlet 202 connected in sequence; the piston valve rod 3 is slidably installed in the installation space 204, and the piston valve rod 3 can move downward along the installation space 204 under the push of low-pressure gas;

[0040] The piston valve rod 3 is inserted into the airflow channel 203. The piston valve rod 3 has a sealing section 321 and a reducing section 322 arranged sequentially along the axial direction. After the piston valve rod 3 moves down, the reducing section 322 can slide into the airflow channel 203 so that an annular airflow gap 301 is formed between the outer wall of the reducing section 322 and the airflow channel 203. The high-pressure gas entering through the inlet 201 flows to the outlet 202 through the airflow channel 203 and the airflow gap.

[0041] Specifically, when low-pressure gas enters the installation space 204 through the inlet channel 101, it pushes the piston valve rod 3 downward. At this time, the reduced diameter section 322 slides into the airflow channel 203, forming an annular airflow gap 301. High-pressure gas enters from the inlet 201 and flows through the airflow channel 203 and the annular airflow gap 301 to the outlet 202. To close the valve and stop the flow of low-pressure gas, the piston valve rod 3 moves upward, and the sealing section 321 blocks the airflow channel 203, achieving a shut-off. The piston valve rod 3 effectively controls the flow of high-pressure gas, and the annular airflow gap 301 ensures a large flow rate of high-pressure gas. The detachable valve body facilitates maintenance and repair.

[0042] For example, such as Figure 2As shown, in some examples, the shut-off valve also includes a return spring 21, which is sleeved on the piston valve rod 3. One end of the return spring 21 abuts against the second valve body 2, and the other end abuts against the top surface of the piston valve rod 3. When the low-pressure gas in the air intake passage 101 disappears, the return spring 21 generates elastic force, driving the piston valve rod 3 to move upward and reset, so that the blocking section 321 blocks the airflow passage 203 again and closes the valve. The piston valve rod 3 can be automatically reset without additional power, which improves the timeliness and reliability of valve closure, ensures that the high-pressure gas flow can be quickly cut off when the low-pressure gas supply is interrupted, and enhances the safety of the system.

[0043] For example, such as Figure 2 As shown, in some examples, the second valve body 2 includes a sealing seat 22, which is detachably mounted on the second valve body 2. The sealing seat 22 has a mounting through hole 2201, through which it is fitted onto the piston valve rod 3. The sealing seat 22 abuts against the top end of the return spring 21 away from the piston valve rod 3. The sealing seat 22 supports the return spring 21, and the airflow channel 203 is located below the sealing seat 22. The sealing seat 22 provides stable support for the return spring 21, ensuring that the spring is subjected to uniform force during extension and contraction, making the return action of the piston valve rod 3 smoother. The detachable sealing seat 22 facilitates replacement and maintenance, ensuring the stability of the return spring 21's operation, thereby improving the service life of the valve.

[0044] For example, such as Figure 3 As shown, in some examples, the second valve body 2 is provided with an installation groove 206, which is connected to the installation space 204. A sealing ring 4 is provided in the installation groove 206. The top surface of the sealing ring 4 abuts against the bottom of the sealing seat 22. The sealing ring 4 is slidably sleeved with the piston valve rod 3. The bottom of the inner ring of the sealing ring 4 has a sloping conical surface 41. The connection between the sealing section 321 and the reduced diameter section 322 of the piston valve rod 3 has a conical protruding sloping surface 3221. The sloping conical surface 41 can abut against the conical protruding sloping surface 3221. The contact between the sloping conical surface 41 and the conical protruding sloping surface 3221 can prevent high-pressure gas from entering the airflow channel 203, thereby disconnecting the air inlet 201 from the annular airflow gap 301.

[0045] It should be noted that when the valve is to be closed and the low-pressure gas supply is stopped, the piston valve rod 3 moves upward, and the conical protrusion 3221 gradually approaches and abuts against the conical surface 41 of the sealing ring 4. As the piston valve rod 3 continues to move upward, the two protrusions fit tightly together, thus blocking the airflow passage 203. The tight fit between the conical protrusion 3221 and the conical surface 41 of the sealing ring 4 enhances the sealing performance when the valve is closed, solving the problem of insufficient sealing force.

[0046] For example, such as Figure 2As shown, in some examples, the installation space 204 is divided into a first chamber 2041 and a second chamber 2042. The piston valve stem 3 is T-shaped, so it is divided into a piston end 31 and a valve stem portion 32. The sealing section 321 and the reduced diameter section 322 are both located in the valve stem portion 32. Specifically, low-pressure gas enters the first chamber 2041 and acts on the piston end 31, pushing the piston valve stem 3 downwards. The valve stem portion 32 moves within the second chamber 2042, causing the reduced diameter section 322 to enter the airflow channel 203, forming an annular airflow gap 301 with the airflow channel 203, thereby opening the shut-off valve. Segmenting the installation space 204 and the piston valve stem 3 makes the functions of each part clearer and the force more reasonable, improving the stability and accuracy of the piston valve stem 3's movement, reducing mutual interference between components, and extending the valve's service life.

[0047] For example, such as Figure 2 As shown, in some examples, the bottom of the second valve body 2 has a pressure relief port 205, which is connected to the second cavity 2042. The pressure relief port 205 is provided to prevent the formation of a sealed space between the bottom of the valve stem 32 and the second cavity 2042. If a vacuum space is formed, the piston valve stem 3 will not be able to move, affecting the normal operation of the shut-off valve. Therefore, the pressure relief port 205 allows the gas to flow at the bottom of the device, thereby enabling the piston valve stem 3 to move up and down normally and improving the working efficiency of the shut-off valve.

[0048] For example, such as Figure 2 As shown, in some examples, the first valve body 1 and the second valve body 2 are connected by threads. During installation, they are tightly connected by rotation; when internal parts need to be inspected or replaced, they can be separated by rotating in the opposite direction. The threaded connection is simple to operate, provides a firm connection, and facilitates the disassembly and assembly of the valve body, thus providing convenience for valve maintenance, upkeep, and component replacement, and reducing maintenance costs.

[0049] For example, such as Figure 3 As shown, in some examples, the piston valve stem 3 includes a first sealing ring 33, which is sleeved on the outer peripheral wall of the valve stem portion 32, and the outer peripheral wall of the first sealing ring 33 abuts against the inner wall of the mounting through hole 2201. During the up-and-down movement of the piston valve stem 3, the first sealing ring 33 remains in close contact with the inner wall of the mounting through hole 2201, preventing high-pressure or low-pressure gas from leaking through the gap between the mounting through hole 2201 and the valve stem portion 32. This enhances the sealing performance between the valve stem portion 32 and the mounting through hole 2201, further preventing gas leakage, ensuring the stability of the valve's internal pressure, and improving the overall sealing performance of the valve.

[0050] For example, such as Figure 2As shown, in some examples, the piston end 31 of the piston valve rod 3 is detachably connected to the valve stem portion 32. When either the piston end 31 or the valve stem portion 32 is damaged, they can be separated and the damaged part replaced individually, without replacing the entire piston valve rod 3. This reduces maintenance costs, increases the flexibility of component replacement, and extends the overall service life of the piston valve rod 3.

[0051] For example, such as Figure 4 As shown, in some examples, the piston valve rod 3 further includes a second sealing ring 34, which is disposed on the piston end 31, with its outer peripheral wall abutting against the inner peripheral wall of the first valve body 1. When the piston end 31 moves up and down, the second sealing ring 34 remains tightly fitted to the inner peripheral wall of the first valve body 1, preventing low-pressure gas in the intake passage 101 from leaking through the gap between the piston end 31 and the first valve body 1. This ensures that the low-pressure gas can effectively drive the piston valve rod 3, improving the efficiency of low-pressure control, reducing low-pressure gas loss, and ensuring the accuracy of valve control.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-pressure gas shut-off valve, characterized in that, include: The first valve body (1) has an air inlet channel (101) for introducing low-pressure gas. The second valve body (2) is located below the first valve body (1) and is detachably connected to the first valve body (1). An installation space (204) is formed between the first valve body (1) and the second valve body (2). The installation space (204) is connected to the air intake channel (101). The second valve body (2) has an air inlet (201), an airflow channel (203) and an air outlet (202) connected in sequence. Piston valve rod (3), the piston valve rod (3) is slidably disposed in the installation space (204), the piston valve rod (3) can move down along the installation space (204) under the push of low pressure gas; The piston valve rod (3) is inserted into the airflow channel (203). The piston valve rod (3) has a sealing section (321) and a reducing section (322) arranged sequentially along the axial direction. After the piston valve rod (3) moves down, the reducing section (322) can slide into the airflow channel (203) so that an annular airflow gap (301) is formed between the outer wall of the reducing section (322) and the airflow channel (203). The high-pressure gas entering through the inlet (201) flows through the airflow channel (203) and the airflow gap to the outlet (202).

2. The high-pressure gas shut-off valve according to claim 1, characterized in that, Also includes: A reset spring (21) is sleeved on the piston valve rod (3). One end of the reset spring (21) abuts against the second valve body (2), and the other end abuts against the top surface of the piston valve rod (3). After the low-pressure gas in the air intake channel (101) disappears, the reset spring (21) is used to drive the piston valve rod (3) to move upward and reset.

3. A high-pressure gas shut-off valve according to claim 2, characterized in that, The second valve body (2) includes: A sealing seat (22) is detachably mounted on the second valve body (2). The sealing seat (22) has an installation through hole (2201). The sealing seat (22) is sleeved on the piston valve rod (3) through the installation through hole (2201). The sealing seat (22) abuts against the top surface of the return spring (21) away from the piston valve rod (3). The sealing seat (22) is used to support the return spring (21). The airflow channel (203) is located below the sealing seat (22).

4. A high-pressure gas shut-off valve according to claim 3, characterized in that, The second valve body (2) is provided with an installation groove (206), which is connected to the installation space (204). A sealing ring (4) is provided in the installation groove (206). The top surface of the sealing ring (4) abuts against the bottom of the sealing seat (22). The sealing ring (4) is slidably sleeved with the piston valve rod (3). The bottom of the inner ring of the sealing ring (4) has an inclined conical surface (41). Wherein, the connection between the blocking section (321) and the reducing section (322) of the piston valve rod (3) has a conical protruding inclined surface (3111), the inclined conical surface (41) can abut against the conical protruding inclined surface (3111), the abutment between the inclined conical surface (41) and the conical protruding inclined surface (3111) can block the airflow channel (203), so that the air inlet (201) and the annular airflow gap (301) are connected or disconnected.

5. A high-pressure gas shut-off valve according to claim 3, characterized in that, The installation space (204) is divided into a first cavity (2041) and a second cavity (2042). The piston valve stem (3) is divided into a piston end (31) and a valve stem part (32). The sealing section (321) and the diameter reduction section (322) are both located in the valve stem part (32).

6. A high-pressure gas shut-off valve according to claim 5, characterized in that, The bottom of the second valve body (2) has a pressure relief port (205), which is connected to the second cavity (2042).

7. A high-pressure gas shut-off valve according to claim 1, characterized in that, The first valve body (1) and the second valve body (2) are threaded together.

8. A high-pressure gas shut-off valve according to claim 5, characterized in that, The piston valve stem (3) includes: The first sealing ring (33) is sleeved on the outer peripheral wall of the valve stem portion (32), and the outer peripheral wall of the first sealing ring (33) abuts against the inner wall of the mounting through hole (2201).

9. A high-pressure gas shut-off valve according to claim 5, characterized in that, The piston end (31) of the piston valve stem (3) is detachably connected to the valve stem portion (32).

10. A high-pressure gas shut-off valve according to claim 9, characterized in that, The piston valve rod (3) also includes: The second sealing ring (34) is disposed on the piston end (31), and the outer peripheral wall of the second sealing ring (34) abuts against the inner peripheral wall of the first valve body (1).

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