A vacuum relief valve and a vacuum relief system and method

Abstract

The present invention discloses a vacuum relief valve and a relief system and method, which relate to the field of valve technology and can solve the problem that the valve group mechanism for releasing the state in a high-pressure pipeline to a vacuum state is complex and difficult to coordinate with itself in the prior art. A vacuum relief valve in an embodiment of the present invention includes a valve body, on which a first air inlet for communicating with a high-pressure pipeline is provided, and a first exhaust port and a second exhaust port for discharging the gas in the high-pressure pipeline in two steps; the first air inlet is connected with the first exhaust port and the second exhaust port in sequence, and the first exhaust port and the second exhaust port are always in a mutually isolated state; and also includes a first valve stem assembly and a second valve stem assembly arranged in the valve body, wherein: the first valve stem assembly and the second valve stem assembly are used to control the switching of the connection state between the first exhaust port, the second exhaust port and the first air inlet in real time according to whether the real-time air pressure value in the first air inlet reaches the air pressure switching critical value.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a vacuum relief valve and a relief system and method. Background Art

[0002] After the gas tank is filled with gas, the high-pressure gas in the pipeline needs to be vented. At present, when venting the high-pressure pipeline, a valve group composed of multiple valves is generally used to achieve the required function, including safety valves, stop valves, solenoid valves and other valves.

[0003] However, the existing structure of a valve group composed of multiple independent valves to achieve the release of high-pressure gas from a high-pressure pipeline to a vacuum state requires the coordination of multiple valves, and the linkage between them is poor. It requires relatively complex control logic and is difficult to coordinate with each other to achieve the release of high-pressure gas from high pressure to a vacuum state in the high-pressure pipeline, resulting in high production costs in the production process. In addition, the entire valve group has complex wiring, occupies a large space, and is also troublesome for subsequent operation and maintenance.

[0004] Based on the above background, the inventor has designed a vacuum relief valve and a relief system and method to solve the above problems, and thus proposed the present application. Summary of the invention

[0005] The purpose of the present application is to provide a vacuum relief valve and a relief system and method to solve the problem in the prior art that the valve group for releasing the state in the high-pressure pipeline to the vacuum state is complex and difficult to coordinate.

[0006] In order to solve the above technical problems, the present invention adopts the following solutions:

[0007] In a first aspect, the present application provides a vacuum relief valve, including a valve body, the valve body being provided with a first air inlet for communicating with a high-pressure pipeline, and a first exhaust port and a second exhaust port for exhausting gas in the high-pressure pipeline in two steps;

[0008] The first air inlet is connected to the first exhaust port and the second exhaust port in sequence, and the first exhaust port and the second exhaust port are always in a mutually isolated state;

[0009] Also included are a first valve stem assembly and a second valve stem assembly disposed in the valve body, wherein:

[0010] The first valve stem assembly and the second valve stem assembly are used to control the switching of the connection states between the first exhaust port, the second exhaust port and the first air inlet in real time according to whether the real-time air pressure value in the first air inlet reaches the air pressure switching critical value.

[0011] Optionally, the valve body is provided with a first chamber, a second chamber and a third chamber which are connected in sequence;

[0012] The first chamber is in communication with the first exhaust port;

[0013] The second chamber is in communication with the first air inlet;

[0014] The third chamber is in communication with the second exhaust port;

[0015] The first valve stem assembly includes a first movable valve body that presses between the first chamber and the second chamber and isolates the two from each other;

[0016] The second valve stem assembly includes a second movable valve body which is pressed between the second chamber and the third chamber to isolate the two from each other.

[0017] Optionally, the first valve stem assembly further includes a fixing seat and a first spring disposed in the first chamber;

[0018] The fixing seat and the first movable valve body are respectively arranged at two ends of the first spring, and the first movable valve body is pressed between the first chamber and the second chamber by the first spring.

[0019] Optionally, a limiting groove is provided at one end of the fixing seat facing the first movable valve body;

[0020] A first valve stem inserted into the limiting groove is disposed at one end of the first movable valve body facing the fixed seat, and the first valve stem is slidably connected to the limiting groove.

[0021] Optionally, a fourth chamber is further provided in the valve body, and the fourth chamber is located on a side of the third chamber away from the second chamber;

[0022] An isolation seat is also provided in the valve body, and the isolation seat is used to isolate the third chamber from the fourth chamber;

[0023] The second valve stem assembly further comprises a piston and a second valve stem, the second movable valve body and the piston are respectively fixed at two ends of the second valve stem, and the second valve stem is slidably and sealingly connected to the isolation seat;

[0024] The piston is slidably and tightly connected to the inner wall of the fourth chamber;

[0025] The valve body is also provided with a second air inlet communicating with the third chamber, and the second air inlet is used to communicate with the external atmosphere or with a gas pipeline where the internal air pressure is higher than the air pressure switching critical value;

[0026] The valve body is also provided with a third air inlet connected with the fourth chamber. The third air inlet is used to be connected with the gas pipeline. The third air inlet is arranged toward the side of the piston away from the isolation seat.

[0027] Optionally, the second valve stem assembly further includes a second spring sleeved on the second valve stem;

[0028] The isolation seat is pressed between the third chamber and the fourth chamber by the second spring;

[0029] One end of the second spring presses against the isolation seat, and the other end presses against the piston.

[0030] Optionally, the first exhaust port and the second exhaust port are located on the same side of the valve body, and the first air inlet is located on the other side of the first exhaust port and the second exhaust port.

[0031] In a second aspect, the present application provides a relief system for a high-pressure pipeline, comprising any one of the above-mentioned vacuum relief valves, as well as a high-pressure pipeline, a vacuum pump and an exhaust pipeline;

[0032] The first air inlet of the pressure relief vacuum valve is connected to the high-pressure pipeline, the first exhaust port of the pressure relief vacuum valve is connected to the exhaust pipeline, and the second exhaust port of the pressure relief vacuum valve is connected to the vacuum pump;

[0033] The pressure relief vacuum valve is used to control the switching of the connection state between the first exhaust port, the second exhaust port and the first air inlet according to whether the air pressure value in the high-pressure pipeline connected to its first air inlet is released to the air pressure switching critical value in the exhaust pipeline.

[0034] Optionally, it also includes a gas pipeline with an internal air pressure higher than the atmospheric pressure and a two-position three-way solenoid valve, the two-position three-way solenoid valve is used to control the on-off switching between the gas pipeline and the fourth chamber and the third chamber, the two outlets of the two-position three-way solenoid valve are respectively connected to the second air inlet and the third air inlet, and one inlet of the two-position three-way solenoid valve is used to connect to the gas pipeline.

[0035] In a third aspect, the present application provides a discharge method, applicable to any of the above-mentioned discharge systems, comprising the following steps:

[0036] S1, connecting the high-pressure pipeline and the first air inlet, so that the high-pressure gas in the second chamber presses against the first movable valve body, connecting the first chamber and the second chamber, until the high-pressure gas in the second chamber is released to the critical switching value state of the air pressure, and the first movable valve body is reset under the action of the first spring to re-isolate the first chamber and the second chamber;

[0037] S2, opening the gas pipeline, so that the gas in the gas pipeline with a pressure higher than the critical switching value presses the piston, so that the second chamber and the third chamber are connected;

[0038] At the same time, the vacuum pump is turned on to vacuum the gas in the high-pressure pipeline at the critical switching value of the air pressure until the air pressure in the high-pressure pipeline is in a vacuum state;

[0039] S3, switch the two-position three-way solenoid valve, the third chamber is connected to the gas pipeline through the second air inlet, under the action of the second spring, the second movable valve body separates the second chamber from the third chamber, at this time, turn off the vacuum pump, and complete the vacuum release process of the entire high-pressure pipeline.

[0040] Beneficial effects of the present invention:

[0041] 1. The present application can release the high-pressure gas in the high-pressure pipeline in steps through a single vacuum release valve, that is, first release it from the high-pressure state to the critical value state of the air pressure switching, and then release it from the critical value state of the air pressure switching to the vacuum state, which solves the problem that the valve group mechanism for releasing the state in the high-pressure pipeline to the vacuum state in the prior art is complex and difficult to coordinate.

[0042] 2. When the vacuum relief valve in the present application is connected to a gas pipeline whose internal air pressure is higher than the air pressure switching critical value, the connection between the third chamber and the second chamber or the external atmosphere can be controlled by a two-position three-way solenoid valve. While the vacuum pump remains in operation, the connection state between the third chamber and the second chamber can be switched to a disconnected state, and at the same time, the disconnected state between the third chamber and the gas pipeline can be switched to a connected state, thereby preventing the vacuum pump from being sucked back and causing damage to the vacuum pump.

[0043] 3. The vacuum relief valve disclosed in the present application has a reasonable structural layout and occupies a small space. The first air inlet and the second air inlet are located on the same side of the vacuum relief valve, the first exhaust port and the second exhaust port are located on the other side of the vacuum relief valve, and the third air inlet is located at the bottom of the vacuum relief valve, which avoids the problem of confusing wiring, saves the assembly space of the equipment, and achieves the technical effect of making small space available. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the three-dimensional structure of Example 1 of the present application.

[0045] Figure 2 This is a schematic diagram of the cross-sectional structure of Example 1 of the present application.

[0046] Figure 3 This is a structural diagram of Example 2 of the present application.

[0047] Figure 4 This is a schematic diagram of the steps of the discharge method in Example 3 of the present application.

[0048] Description of reference numerals:

[0049] 1-valve body, 101-first air inlet, 102-first exhaust port, 103-second exhaust port, 104-second air inlet, 105-third air inlet, 106-first chamber, 107-second chamber, 108-third chamber, 109-fourth chamber, 2-first valve stem assembly, 21-fixed seat, 211-limiting groove, 22-first movable valve body, 221-first valve stem, 23-first spring, 3-second valve stem assembly, 31-piston, 32-second valve stem, 33-second movable valve body, 34-second spring, 4-isolation seat, 5-vacuum pump, 6-solenoid valve. DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0051] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0052] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "opened", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0054] Embodiment 1:

[0055] like Figure 1 and Figure 2 As shown, this embodiment provides a vacuum relief valve, including a valve body 1, on which a first air inlet 101 for communicating with a high-pressure pipeline is provided, and a first exhaust port 102 and a second exhaust port 103 for exhausting gas in the high-pressure pipeline in two steps in succession;

[0056] The first air inlet 101 is connected to the first exhaust port 102 and the second exhaust port 103 in sequence, and the first exhaust port 102 and the second exhaust port 103 are always isolated from each other;

[0057] The valve body 1 also includes a first valve stem assembly 2 and a second valve stem assembly 3, wherein:

[0058] The first valve stem assembly 2 and the second valve stem assembly 3 are used to control the connection state switching between the first exhaust port 102, the second exhaust port 103 and the first air inlet 101 in real time according to whether the real-time air pressure value in the first air inlet 101 reaches the air pressure switching critical value.

[0059] The pressure switching critical value in this embodiment is the same as the pressure value in the first exhaust port 102, which is the atmospheric pressure value. In some embodiments, technicians can set it to be higher than or lower than the atmospheric pressure as needed. The specific value can be set according to needs and will not be elaborated here.

[0060] When the vacuum release valve in this embodiment releases the high-pressure gas higher than the atmospheric pressure in the high-pressure pipeline to a vacuum state, it first uses the connected first air inlet 101 and the first exhaust port 102 to release the gas in the high-pressure pipeline to the atmospheric pressure state, and then uses the connected first air inlet 101 and the second exhaust port 103 to suck the gas in the high-pressure pipeline at the atmospheric pressure state to the vacuum state through the vacuum pump 5 connected to the second exhaust port 103.

[0061] Therefore, this embodiment releases the high-pressure gas in the high-pressure pipeline in steps through a single vacuum release valve, that is, first releasing it from the high-pressure state to the critical value state of the air pressure switching, and then releasing it from the critical value state of the air pressure switching to the vacuum state, thereby solving the problem in the prior art that the valve group mechanism for releasing the state in the high-pressure pipeline to the vacuum state is complex and difficult to coordinate with each other.

[0062] Specifically, in this embodiment, the valve body 1 is provided with a first chamber 106, a second chamber 107 and a third chamber 108 which are connected in sequence;

[0063] The first chamber 106 is in communication with the first exhaust port 102;

[0064] The second chamber 107 is in communication with the first air inlet 101;

[0065] The third chamber 108 is in communication with the second exhaust port 103;

[0066] The first valve stem assembly 2 includes a first movable valve body 22 that is pressed between the first chamber 106 and the second chamber 107 and isolates the two from each other;

[0067] The second valve stem assembly 3 includes a second movable valve body 33 that is pressed between the second chamber 107 and the third chamber 108 to isolate the two from each other.

[0068] When the first air inlet 101 is connected to the first exhaust port 102, the second exhaust port 103 and the third chamber 108 connected thereto are isolated from the second chamber 107 and the first air inlet 101. Therefore, when the high-pressure gas higher than the atmospheric pressure in the high-pressure pipeline is discharged through the first exhaust port 102, the air pressure in the second chamber 107 will gradually decrease, so that the air pressure driving force applied by the second chamber 107 to the second movable valve body 33 will gradually decrease, so that the second movable valve body 33 moves to the second chamber 107, thereby connecting the third chamber 108 and the second chamber 107, and preparing for releasing the second chamber 107 from the atmospheric pressure state to the vacuum state.

[0069] When the first air inlet 101 and the second exhaust port 103 are connected, the first air inlet 101 and the first exhaust port 102 are separated from each other by the first movable valve body 22, and the gas at atmospheric pressure in the high-pressure pipeline is gradually discharged from the second exhaust port 103 until the gas at atmospheric pressure in the high-pressure pipeline is in a vacuum state. During this process, the air pressure in the second chamber 107 will gradually decrease, so that the first movable valve body 22 will continue to increase the top pressure under the pressure difference between the atmospheric pressure and the air pressure in the second chamber 107, thereby improving the separation effect between the first chamber 106 and the second chamber 107.

[0070] In this embodiment, Figure 2 As shown, a first conical opening is provided between the first chamber 106 and the second chamber 107 , the first movable valve body 22 has a first conical inclined surface adapted to the first conical opening, and a sealing ring is also provided on the first conical inclined surface for improving the sealing effect.

[0071] In this embodiment, Figure 2 As shown, a second tapered mouth is further provided between the second chamber 107 and the third chamber 108, the second movable valve body 33 has a second tapered inclined surface adapted to the second tapered mouth, and a sealing ring for improving the sealing effect is also provided on the second tapered inclined surface. In the present embodiment, the side with a larger size of the first tapered mouth is provided close to the first chamber 106, and the side with a larger size of the second tapered mouth is provided close to the second chamber 107. Therefore, the first movable valve body 22 can only move toward the first chamber 106, and the second movable valve body 33 can only move toward the second chamber 107.

[0072] Specifically, in this embodiment, the first valve stem assembly 2 further includes a fixing seat 21 and a first spring 23 disposed in the first chamber 106;

[0073] The fixing seat 21 and the first movable valve body 22 are respectively disposed at two ends of the first spring 23 , and the first movable valve body 22 is pressed between the first chamber 106 and the second chamber 107 by the first spring 23 .

[0074] By providing the first spring 23, after the air pressure between the first chamber 106 and the second chamber 107 is balanced, the first movable valve body 22 can be re-pressed between the first chamber 106 and the second chamber 107 by the first spring 23 to act as a partition, ensuring that the first chamber 106 and the second chamber 107 are connected to each other only when the air pressure in the first chamber 106 is higher than the air pressure in the second chamber 107.

[0075] Specifically, in this embodiment, if Figure 2 As shown, a limiting groove 211 is provided at one end of the fixing seat 21 facing the first movable valve body 22;

[0076] The first movable valve body 22 is provided with a first valve stem 221 inserted into the limiting groove 211 at one end facing the fixed seat 21. The first valve stem 221 is slidably connected to the limiting groove 211. By setting the first valve stem 221 and the limiting groove 211, the first movable valve body 22 can only move along the axial direction of its first valve stem 221.

[0077] Specifically, in this embodiment, if Figure 2 As shown, a fourth chamber 109 is further provided in the valve body 1, and the fourth chamber 109 is located on a side of the third chamber 108 away from the second chamber 107;

[0078] The valve body 1 is further provided with an isolation seat 4, which is used to isolate the third chamber 108 from the fourth chamber 109;

[0079] The second valve stem assembly 3 further includes a piston 31 and a second valve stem 32. The second movable valve body 33 and the piston 31 are respectively fixed at two ends of the second valve stem 32. The second valve stem 32 is slidably and sealingly connected to the isolation seat 4.

[0080] The piston 31 is slidably and tightly connected to the inner wall of the fourth chamber 109;

[0081] The valve body 1 is also provided with a second air inlet 104 communicating with the third chamber 108, and the second air inlet 104 is used to communicate with the external atmosphere and a gas pipeline with a pressure higher than the atmospheric pressure;

[0082] The valve body 1 is further provided with a third air inlet 105 communicating with the fourth chamber 109. The third air inlet 105 is used to communicate with a gas pipeline having a pressure higher than the atmospheric pressure. The third air inlet 105 is arranged toward the side of the piston 31 away from the isolation seat 4.

[0083] In this embodiment, the second air inlet 104 is connected to a gas pipeline with a pressure higher than atmospheric pressure through a two-position three-way solenoid valve 6. By setting the second air inlet 104 and the third air inlet 105, and the second air inlet 104 and the third air inlet 105 are connected to the gas pipeline through the two-position three-way solenoid valve 6, the connection state between the third chamber 108 and the second chamber 107 can be switched to a disconnected state while the vacuum pump 5 remains in operation, and at the same time, the disconnected state between the third chamber 108 and the gas pipeline can be switched to a connected state, thereby preventing the vacuum pump 5 from being sucked back and causing damage to the vacuum pump 5.

[0084] Specifically, in this embodiment, if Figure 2 As shown, the second valve stem assembly 3 further includes a second spring 34 sleeved on the second valve stem 32;

[0085] The isolation seat 4 is pressed between the third chamber 108 and the fourth chamber 109 by the second spring 34;

[0086] One end of the second spring 34 presses on the isolation seat 4, and the other end presses on the piston 31. By setting the second spring 34, the second movable valve body 33 will continue to press between the second chamber 107 and the third chamber 108 to act as a partition. After the gas pipeline is connected with the fourth chamber 109, the gas in the gas pipeline will enter the fourth chamber 109 and press the piston 31, pushing the piston 31 to move to one side of the isolation seat 4, so that the second movable valve body 33 moves toward the second chamber 107, so that the second chamber 107 and the third chamber 108 are connected. After the vacuum pump 5 is turned on, it can suck the gas in the high-pressure pipeline in the atmospheric pressure state until the high-pressure pipeline is in a vacuum state. During the movement of the piston 31, the second spring 34 is gradually compressed and is in an energy storage state.

[0087] In this embodiment, the pressure exerted on the piston 31 by the gas in the gas pipeline after entering the fourth chamber 109 is greater than the sum of the pressure exerted on the second movable valve body 33 by the atmospheric pressure and the pressure exerted on the piston 31 by the spring.

[0088] Specifically, in this embodiment, if Figure 1 As shown, the first exhaust port 102 and the second exhaust port 103 are located on the same side of the valve body 1, and the first air inlet 101 is located on the other side of the first exhaust port 102 and the second exhaust port 103, thereby avoiding the problem of confusing wiring, saving the assembly space of the equipment, and achieving the technical effect of making small space available.

[0089] Embodiment 2:

[0090] Based on the above embodiment 1, this embodiment provides a relief system, comprising any one of the above-mentioned vacuum relief valves, as well as a high-pressure pipeline, a vacuum pump 5 and an exhaust pipeline (not shown in the figure);

[0091] The first air inlet 101 of the pressure relief vacuum valve is connected to the high-pressure pipeline, the first exhaust port 102 of the pressure relief vacuum valve is connected to the exhaust pipeline, and the second exhaust port 103 of the pressure relief vacuum valve is connected to the vacuum pump 5;

[0092] The pressure relief vacuum valve is used to control the connection state switching between the first exhaust port 102, the second exhaust port 103 and the first air inlet 101 according to whether the air pressure value in the high-pressure pipeline connected to its first air inlet 101 is released to the air pressure switching critical value in the exhaust pipeline.

[0093] The exhaust pipe in this embodiment is directly connected to the external atmosphere, the air pressure in the exhaust pipe and the first exhaust port 102 is the external atmospheric pressure, and the air pressure switching critical value is also the atmospheric pressure. The vacuum pump 5 in this embodiment is a common device, and the exhaust end of the vacuum pump 5 is connected to the second exhaust port 103, which can extract the gas in the high-pressure pipe and put the high-pressure pipe in a vacuum state.

[0094] Specifically, in the present embodiment, it also includes a gas pipeline whose internal air pressure is higher than the atmospheric pressure and a two-position three-way solenoid valve 6. The two-position three-way solenoid valve 6 is used to control the on-off of the gas pipeline and the fourth chamber 109 and the third chamber 108. The two outlets of the two-position three-way solenoid valve 6 are respectively connected to the second air inlet 104 and the third air inlet 105, and one inlet of the two-position three-way solenoid valve 6 is used to connect to the gas pipeline.

[0095] By setting a two-position three-way solenoid valve 6 and a gas pipeline, after the high-pressure pipeline is in a vacuum state, the connection between the third chamber 108 and the second chamber 107 can be directly cut off, so that the high-pressure pipeline can maintain a vacuum state without being affected by the negative pressure suction of the vacuum pump 5. After the third chamber 108 and the second chamber 107 are cut off, the second air inlet 104 is connected to the gas pipeline through the two-position three-way solenoid valve 6, which can avoid the third chamber 108 being in a sealed state, so that the vacuum pump 5 can draw gas from the gas pipeline, thereby preventing the vacuum pump 5 from being sucked back and causing damage to the vacuum pump 5.

[0096] The rest of the structure of this embodiment is the same as that of the above-mentioned embodiment 1 and will not be described in detail here.

[0097] Embodiment 3:

[0098] like Figure 4 As shown, this embodiment provides a discharge method, which is applicable to a discharge system described in Example 2, and specifically includes the following steps:

[0099] S1, connect the high-pressure pipeline and the first air inlet 101, so that the high-pressure gas in the second chamber 107 presses against the first movable valve body 22, connecting the first chamber 106 and the second chamber 107, until the high-pressure gas in the second chamber 107 is released to the critical switching value state of the air pressure, and the first movable valve body 22 is reset under the action of the first spring 23 to re-isolate the first chamber 106 and the second chamber 107;

[0100] S2, opening the gas pipeline, so that the gas in the gas pipeline with a pressure higher than the critical switching value presses the piston 31, so that the second chamber 107 and the third chamber 108 are connected;

[0101] At the same time, the vacuum pump 5 is turned on to vacuum the gas in the high-pressure pipeline at the critical switching value of the pressure until the pressure in the high-pressure pipeline is in a vacuum state;

[0102] S3, switch the two-position three-way solenoid valve 6, the third chamber 108 is connected to the gas pipeline through the second air inlet 104, and under the action of the second spring 34, the second movable valve body 33 separates the second chamber 107 and the third chamber 108. At this time, the vacuum pump 5 is turned off to complete the vacuum relief process of the entire high-pressure pipeline.

[0103] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A vacuum relief valve, characterized in that: The valve body (1) comprises a first air inlet (101) for communicating with a high-pressure pipeline, and a first exhaust port (102) and a second exhaust port (103) for exhausting gas in the high-pressure pipeline in two steps; The first air inlet (101) is connected to the first exhaust port (102) and the second exhaust port (103) in sequence, and the first exhaust port (102) and the second exhaust port (103) are always in a mutually isolated state; It also includes a first valve stem assembly (2) and a second valve stem assembly (3) arranged in the valve body (1), wherein: The first valve stem assembly (2) and the second valve stem assembly (3) are used to control the switching of the connection state between the first exhaust port (102), the second exhaust port (103) and the first air inlet (101) in real time according to whether the real-time air pressure value in the first air inlet (101) reaches the air pressure switching critical value; The first exhaust port (102) and the second exhaust port (103) are respectively located on two sides of the first air inlet (101); A second chamber (107) in communication with the first air inlet (101) is provided in the valve body (1); the first valve stem assembly (2) and the second valve stem assembly (3) are arranged on opposite sides of the second chamber (107); The first exhaust port (102) is used to first exhaust the high-pressure gas in the high-pressure pipeline to a critical value; The second exhaust port (103) is used to suck the gas at a critical value in the high-pressure pipeline to a vacuum state; In the process of the gas pressure in the high-pressure pipeline being discharged from the high-pressure state to the critical value: The first valve stem assembly (2) is pushed away from the valve seat by the air pressure in the high-pressure pipeline, and the first exhaust port (102) is connected to the first air inlet (101), while the second valve stem assembly (3) is pressed against the valve seat by the high-pressure gas in the high-pressure pipeline, and the second exhaust port (103) is isolated from the first air inlet (101); In the process of pumping the gas pressure in the high-pressure pipeline from the critical value to the vacuum state: The first valve stem assembly (2) isolates the first exhaust port (102) and the first air inlet (101) through spring return, while the second valve stem assembly (3) is pushed off the valve seat by external air pressure, and the second exhaust port (103) is connected to the first air inlet (101).

2. A vacuum relief valve according to claim 1, characterized in that: The valve body (1) is further provided with a first chamber (106) and a third chamber (108), and the first chamber (106), the second chamber (107) and the third chamber (108) are connected in sequence; The first chamber (106) is in communication with the first exhaust port (102); The third chamber (108) is in communication with the second exhaust port (103); The first valve stem assembly (2) comprises a first movable valve body (22) which is pressed between the first chamber (106) and the second chamber (107) to isolate the two from each other; The second valve stem assembly (3) comprises a second movable valve body (33) which is pressed between the second chamber (107) and the third chamber (108) to isolate the two from each other.

3. A vacuum relief valve according to claim 2, characterized in that: The first valve stem assembly (2) further comprises a fixing seat (21) and a first spring (23) arranged in the first chamber (106); The fixed seat (21) and the first movable valve body (22) are respectively arranged at two ends of the first spring (23), and the first movable valve body (22) is pressed between the first chamber (106) and the second chamber (107) by the first spring (23).

4. A vacuum relief valve according to claim 3, characterized in that: A limiting groove (211) is provided at one end of the fixing seat (21) facing the first movable valve body (22); One end of the first movable valve body (22) facing the fixed seat (21) is provided with a first valve stem (221) inserted into the limiting groove (211), and the first valve stem (221) is slidably connected to the limiting groove (211).

5. A vacuum relief valve according to claim 2, characterized in that: A fourth chamber (109) is also provided in the valve body (1), and the fourth chamber (109) is located on a side of the third chamber (108) away from the second chamber (107); An isolation seat (4) is also provided in the valve body (1), and the isolation seat (4) is used to isolate the third chamber (108) from the fourth chamber (109); The second valve stem assembly (3) further comprises a piston (31) and a second valve stem (32); the second movable valve body (33) and the piston (31) are respectively fixed at two ends of the second valve stem (32); and the second valve stem (32) is slidably and sealingly connected to the isolation seat (4); The piston (31) is slidably and tightly connected to the inner wall of the fourth chamber (109); The valve body (1) is also provided with a second air inlet (104) communicating with the third chamber (108); the second air inlet (104) is used to communicate with the external atmosphere or with a gas pipeline whose internal air pressure is higher than the air pressure switching critical value; The valve body (1) is also provided with a third air inlet (105) in communication with the fourth chamber (109). The third air inlet (105) is used to communicate with a gas pipeline. The third air inlet (105) is arranged toward a side of the piston (31) away from the isolation seat (4).

6. A vacuum relief valve according to claim 5, characterized in that: The second valve stem assembly (3) further comprises a second spring (34) sleeved on the second valve stem (32); The isolation seat (4) is pressed between the third chamber (108) and the fourth chamber (109) by a second spring (34); One end of the second spring (34) presses against the isolation seat (4), and the other end presses against the piston (31).

7. A vacuum relief valve according to claim 1, characterized in that: The first exhaust port (102) and the second exhaust port (103) are located on the same side of the valve body (1), and the first air inlet (101) is located on the other side of the first exhaust port (102) and the second exhaust port (103).

8. A discharge system for a high-pressure pipeline, characterized in that: Comprising a vacuum relief valve as claimed in any one of claims 1 to 7, as well as a high-pressure pipeline, a vacuum pump (5) and an exhaust pipeline; The first air inlet (101) of the pressure relief vacuum valve is in communication with the high-pressure pipeline, the first exhaust port (102) of the pressure relief vacuum valve is in communication with the exhaust pipeline, and the second exhaust port (103) of the pressure relief vacuum valve is in communication with the vacuum pump (5); The pressure relief vacuum valve is used to control the switching of the connection state between the first exhaust port (102), the second exhaust port (103) and the first air inlet (101), according to whether the air pressure value in the high-pressure pipeline connected to the first air inlet (101) is released to the air pressure switching critical value in the exhaust pipeline.

9. A discharge system for a high-pressure pipeline according to claim 8, characterized in that: It also includes a gas pipeline with an internal gas pressure higher than atmospheric pressure and a two-position three-way solenoid valve (6). The two-position three-way solenoid valve (6) is used to control the on-off switching between the gas pipeline and the fourth chamber (109) and the third chamber (108). Two outlets of the two-position three-way solenoid valve (6) are respectively connected to the second air inlet (104) and the third air inlet (105), and one inlet of the two-position three-way solenoid valve (6) is used to communicate with the gas pipeline.

10. A discharge method, applicable to a discharge system for a high-pressure pipeline according to claim 8 or 9, characterized in that: The following steps are involved: S1, connecting the high-pressure pipeline and the first air inlet (101), so that the high-pressure gas in the second chamber (107) presses against the first movable valve body (22), thereby connecting the first chamber (106) and the second chamber (107), until the high-pressure gas in the second chamber (107) is released to a critical pressure switching value state, and the first movable valve body (22) is reset under the action of the first spring (23) to re-isolate the first chamber (106) and the second chamber (107); S2, opening the gas pipeline, so that the gas in the gas pipeline with a pressure higher than the critical switching value presses the piston (31), so that the second chamber (107) and the third chamber (108) are connected; At the same time, the vacuum pump (5) is turned on to vacuum the gas in the high-pressure pipeline at the critical switching value of the pressure until the pressure in the high-pressure pipeline is in a vacuum state; S3, switch the two-position three-way solenoid valve (6), the third chamber (108) is connected to the gas pipeline through the second air inlet (104), and under the action of the second spring (34), the second movable valve body (33) separates the second chamber (107) and the third chamber (108), and at this time, the vacuum pump (5) is turned off, completing the vacuum release process of the entire high-pressure pipeline.

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