A passive automatic shut-off valve

Abstract

The present invention relates to a passive automatic shut-off valve, specifically to a passive automatic shut-off valve that automatically shuts off the connection between a large oil storage tank, a gas station tank, or a test point under static pressure conditions in a flammable and explosive environment when a liquid leaks accidentally from a connection point in various test sampling points of a large oil storage tank, a gas station, or a pipeline transportation system. The device comprises an upper valve body and a lower valve body, wherein an upper valve core body is provided inside the upper valve body, a lower valve body is provided at the bottom of the upper valve body, and a lower valve core body is provided on the lower valve body, a guide assembly is provided between the upper valve core body and the lower valve core body, and at least one valve core opener is provided between the upper valve body and the lower valve body. The purpose of the present invention is to develop a device that can automatically and quickly shut off the connection between external equipment and the sensor, valve, or connecting pipe connected to the large oil storage tank or gas station test system under passive conditions when an accidental leak occurs, thereby ensuring that leakage is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of cut-off valves, and in particular to a passive automatic cut-off device that automatically cuts off the connection between a large oil storage tank, a gas station tank and a test point under unpowered conditions when an accidental liquid leak occurs at a connection point in various test sampling points of large oil storage tanks, gas stations and pipeline transportation equipment under static pressure conditions in an inflammable and explosive environment. Background Art

[0002] With the improvement and popularization of automation technology in strategic reserve oil depots, a large number of pressure, temperature, liquid level, density and other parameters need to be detected and measured in equipment such as oil depots, gas stations, and chemical reactors.

[0003] Currently, pressure, temperature, and liquid level measurement ports on large storage tanks and gas stations utilize direct connections or capillary pressure induction. In practice, sensors are connected to the tanks via connectors such as pipes and valves. Because these connections lack automatic safety features, unexpected failures in valves, pipes, capillaries, and other connectors can lead to leaks (e.g., sensor or valve damage, or pipe ruptures), potentially exposing flammable and explosive liquids to potential safety hazards in production and management, potentially causing major accidents and significant losses and serious consequences for the nation and society. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a passive automatic shut-off valve.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A passive automatic shut-off valve comprises an upper valve body and a lower valve body, wherein an upper valve core body is arranged inside the upper valve body, a lower valve body is arranged at the bottom of the upper valve body, and a lower valve core body is arranged on the lower valve body, a guide component is arranged between the upper valve core body and the lower valve core body, and at least one valve core opener is arranged between the upper valve body and the lower valve body.

[0007] In the above-mentioned passive automatic shut-off valve, one end of the lower valve body is provided with an inlet end, and the other end of the lower valve body is provided with an outlet end.

[0008] In the above-mentioned passive automatic shut-off valve, the guide component is located between the above-mentioned inlet end and outlet end.

[0009] In the above-mentioned passive automatic shut-off valve, the guide assembly includes a first hole formed on the upper valve core body and a second hole formed on the lower valve core body.

[0010] In the above-mentioned passive automatic shut-off valve, the diameter of the first hole is 2 to 6 mm, the hole spacing is 20 to 55 mm, and the diameter of the second hole is 3 to 8 mm.

[0011] In the above-mentioned passive automatic shut-off valve, the valve core opener includes a sealing cavity opened on the lower valve body, a spring is provided in the sealing cavity, and a button handle is provided at one end of the spring through a sealing sheet.

[0012] In the above-mentioned passive automatic shut-off valve, the upper half of the guide assembly is the upper valve body chamber, and the lower half of the guide assembly is the lower valve body chamber. A connecting hole 1 and a connecting hole 2 are respectively opened in the sealing cavity on the lower valve body. The connecting hole 1 is connected to the upper valve body chamber, and the connecting hole 2 is connected to the lower valve body chamber.

[0013] In the above-mentioned passive automatic shut-off valve, the second communicating hole is located at one end of the above-mentioned sealing plate, and the first communicating hole is located at the other end of the sealing plate.

[0014] In the above-mentioned passive automatic shut-off valve, the upper valve core body and the lower valve core body are both high-constant elastic diaphragms, and the upper valve body and the lower valve body are both stainless steel.

[0015] In the above-mentioned passive automatic shut-off valve, under isobaric conditions, a gap of 1 to 5 mm is maintained between the upper valve core body and the lower valve core body, and the upper valve core body and the lower valve core body remain in communication.

[0016] Compared with the existing technology, the present invention is used in flammable and explosive environments. In the absence of power, it can automatically cut off the connection between the inlet and outlet. Therefore, it is safe to use in flammable and explosive environments. The passive automatic shut-off valve itself is intrinsically safe. Therefore, this device can be used to connect the pressure, temperature, and density measuring ports on almost any liquid tank, especially for protecting some harmful, flammable, and explosive liquid tanks and measuring ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A partial cross-sectional view of an embodiment of a passive automatic shut-off valve proposed by the present invention;

[0018] Figure 2 A top view of an embodiment of a passive automatic shut-off valve proposed by the present invention;

[0019] Figure 3 This is a schematic cross-sectional structural diagram of the shell of a passive automatic shut-off valve proposed by the present invention.

[0020] In the figure: 1, upper valve body; 2, upper valve core body; 3, lower valve core body; 4, lower valve body; 5, valve core opener; 6, inlet end; 7, outlet end. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figure 1-3 , a passive automatic shut-off valve, comprising an upper valve body 1, a lower valve body 4, an upper valve core body 2 and a lower valve core body 3;

[0023] The following points are worth noting:

[0024] 1. The upper valve core body 2 and the lower valve core body 3 are respectively arranged inside the upper valve body 1 and the lower valve body 4, and a guide component is provided between the upper valve core body 2 and the lower valve core body 3;

[0025] 2. An inlet port 6 is provided at one end of the lower valve body 4, and an outlet port 7 is provided at the other end of the lower valve body 4. A guide assembly is located between the inlet port 6 and the outlet port 7, and the guide assembly is used to guide the liquid;

[0026] 3. The guide assembly includes a hole 1 formed on the upper valve core body 2 and a hole 2 formed on the lower valve core body 3. The diameter of the hole 1 is 2 to 6 mm, the hole spacing is 20 to 55 mm, and the diameter of the hole 2 is 3 to 8 mm.

[0027] 4. When there is no leakage in the connecting pipelines, sensors and other test devices, the upper valve core body 2 and the lower valve core body 3 maintain balance with each other under the action of equal pressure, and the lower valve core body 3 and the lower valve body 4 maintain a gap of 1 to 5 mm, so that the inlet end 6 and the outlet end 7 are connected, that is, the inlet pressure is equal to the outlet pressure, and the liquid will flow into the lower valve body chamber through the gap between the lower valve core body 3 and the hole 1 of the upper valve core body 2.

[0028] At least one valve core opener 5 is provided between the upper valve body 1 and the lower valve body 4;

[0029] The following points are worth noting:

[0030] 1. The valve core opener 5 includes a sealed cavity formed on the lower valve body 4. A spring is provided in the sealed cavity, and a button handle is provided at one end of the spring through a sealing sheet.

[0031] 2. The upper half of the guide assembly is the upper valve body chamber, and the lower half of the guide assembly is the lower valve body chamber. The sealing cavity on the lower valve body 4 is respectively provided with a communication hole 1 and a communication hole 2. Communication hole 1 is connected to the upper valve body chamber, and communication hole 2 is connected to the lower valve body chamber. Communication hole 2 is located at one end of the sealing plate, and communication hole 1 is located at the other end of the sealing plate.

[0032] 3. When the external equipment is normal and there is no leakage, when the system pressure needs to be restored, you only need to manually press the valve core opener 5. When the valve core opener 5 is pressed, the connecting hole 1 and the connecting hole 2 of the valve core opener 5 are connected. At this time, the outlet end 7 of the lower valve body 4 of the passive automatic shut-off valve is affected by the liquid pressure of the inlet end 6 to pressurize the system, which forms a back pressure on the lower valve body 4 of the valve core body assembly. Under the action of the back pressure, the lower valve core body 3 will move up to a certain distance. When the valve core body moves up, the liquid will flow into the lower valve body chamber through the gap between the lower valve core 3 and the hole 1 of the upper valve core body 2. At this time, the inlet pressure is equal to the outlet pressure and maintains its state.

[0033] Specifically, in the above embodiment, the upper valve core body 2 and the lower valve core body 3 are both high-constant elastic diaphragms, and the upper valve body 1 and the lower valve body 4 are both stainless steel. The aperture of the upper valve core body 2 is: 2~6 mm ± 0.1, the hole spacing is 20~55 mm ± 0.1, and the aperture on the lower valve core body 3 is 3~8 mm ± 0.1; the interval between the upper and lower valve core bodies is 0.1~0.5 mm ± 0.02.

[0034] In the present invention, the passive automatic shut-off valve has a sealing surface structural feature in that when a leakage accident occurs in the pipeline system, liquid will flow in the system toward the leakage point, that is, liquid will flow in the guide assembly of the passive automatic shut-off valve and the outlet end 7 of the lower valve body 4, causing the liquid level in the lower chamber of the passive automatic shut-off valve to drop rapidly. At the same time, suction generated by the flow rate of the liquid, pressure generated by the pressure difference caused by the flow of the liquid, and downward gravity generated by the weight of the liquid acting on the surface of the upper valve core body 2 due to the drop in the liquid level caused by the flow of the liquid will be generated.

[0035] Under the action of these three forces, the elastic resistance of the upper and lower valve core bodies and the stress caused by the deformation of the high-constant elastic diaphragm will be overcome, so that the upper valve core body 2 moves downward until it contacts the surface of the lower valve core body 3. The upper surface of the lower valve core body 3 contacts the two liquid inlet holes of the upper valve core body 2 and is sealed. At the same time, the lower surface of the lower valve core body 3 will connect with the hole of the lower valve body 4 until it is sealed, thereby cutting off the flow of liquid. At this time, the passive automatic shut-off valve is in a closed state.

[0036] Under normal conditions, liquid flows through the inlet port 6 and outlet port 7 of the lower valve body 4, respectively, to connect pipelines, sensors, and other test devices. When no leakage occurs, the upper and lower valve bodies are at equal pressure in the liquid and maintain equilibrium with each other. This means that a gap of 1 to 5 mm is maintained between the lower valve body 3 and the lower valve body 4, allowing the inlet port 6 to communicate with the outlet port 7, ensuring that the inlet pressure is equal to the outlet pressure.

[0037] In the closed state, when a leakage accident occurs in the pipeline system, the liquid in the system will flow to the leakage point, that is, liquid will flow in the lower chamber and outlet of the passive automatic shut-off valve, causing the liquid level in the lower chamber of the passive automatic shut-off valve to drop rapidly, and at the same time, three downward forces will be generated;

[0038] (1) Due to the small gap between the upper and lower valve core bodies, and the two small holes opened in the upper valve core body 2 and the staggered hole position of the hole opened in the lower valve core body 3, and because both the upper and lower valve core bodies are high-constant elastic diaphragms with good flexibility and elasticity, the liquid flow rates through the upper and lower valve core body holes of the passive automatic shut-off valve are inconsistent, which will generate a certain suction force in the lower chamber of the passive automatic shut-off valve. Under the action of the suction force, the upper valve core body 2 and the lower valve core body 3 will move downward with the flow of the liquid;

[0039] ⑵ When the liquid level in the lower chamber of the passive automatic shut-off valve drops rapidly, the pressure balance between the upper and lower chambers is destroyed, that is, the pressure in the upper chamber of the passive automatic shut-off valve (the pressure from the outside, such as the liquid level pressure in the tank) is greater than the pressure in the lower chamber, generating downward pressure;

[0040] ⑶ As the liquid level in the lower chamber of the passive automatic shut-off valve drops rapidly, the weight of the liquid in the upper chamber acts on the upper surface of the upper valve core 2, generating downward pressure;

[0041] Under the action of these three forces, the elastic resistance of the upper valve core body 2 and the lower valve core body 3 and the stress caused by the deformation of the high-constant elastic diaphragm will be overcome, so that the upper valve core body 2 moves downward until it contacts the surface of the lower valve core body 3, and the upper surface of the lower valve core body 3 contacts the inlet hole of the upper valve core body 2 and is sealed. At the same time, the lower surface of the lower valve core body 3 contacts the hole of the valve body until it is sealed, which plays a role in cutting off the flow of liquid. At this time, the passive automatic shut-off valve plays a protective role for the system.

[0042] When resetting: When the external equipment is normal and there is no leakage, when the system pressure needs to be restored, you only need to manually press the valve body opener 5. When the valve body opener 5 of the lower valve body 4 is pressed, the connecting hole 1 and the connecting hole 2 of the valve body opener 5 are connected. At this time, the outlet end 7 of the lower valve body 4 of the passive automatic shut-off valve is subjected to the liquid pressure of the inlet end 6 to pressurize the system, which forms a back pressure on the lower valve body 4 of the valve core body assembly. Under the action of the back pressure, the lower valve core body 3 will move up to a certain distance. When the valve core body moves up, the liquid will pass through the lower valve core 3 and the gap between the hole 1 of the upper valve core body 2 and flow into the lower valve body chamber. At this time, the inlet pressure is equal to the outlet pressure and maintains its state.

[0043] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

Claims

1. A passive automatic shut-off valve, comprising an upper valve body (1) and a lower valve body (4), wherein an upper valve core body (2) is provided inside the upper valve body (1), a lower valve body (4) is provided at the bottom of the upper valve body (1), and a lower valve core body (3) is provided on the lower valve body (4), wherein both the upper valve core body (2) and the lower valve core body (3) are high-constant elastic diaphragms, and under isobaric conditions, a preset gap is maintained between the upper valve core body (2) and the lower valve core body (3) and the valve core body (3) remains in communication with each other; a guide assembly is provided between the upper valve core body (2) and the lower valve core body (3), and the guide assembly includes a valve body provided on the upper valve core body (2) and a valve body (4) provided on the lower valve core body (3). The hole 1 on the upper portion and the hole 2 on the lower valve core body (3) are provided. When a leakage occurs at the outlet end (7) of the cut-off valve or an external device connected to the outlet end, resulting in a pressure difference between the upper valve core body (2) and the lower valve core body (3), the upper valve core body (2) and the lower valve core body (3) move relative to each other to automatically cut off the fluid passage; at least one valve core opener (5) is provided between the upper valve body (1) and the lower valve body (4), and is used to restore the upper valve core body (2) and the lower valve core body (3) to the preset gap and restore the communicating state by operating the valve core opener (5) after the leakage is eliminated.

2. A passive automatic shut-off valve according to claim 1, characterized in that: One end of the lower valve body (4) is provided with an inlet end (6), and the other end of the lower valve body (4) is provided with an outlet end (7).

3. A passive automatic shut-off valve according to claim 2, characterized in that: The guide assembly is located between the inlet end (6) and the outlet end (7).

4. A passive automatic shut-off valve according to claim 1, characterized in that: The diameter of the first hole is 2-6 mm, the hole spacing is 20-55 mm, and the diameter of the second hole is 3-8 mm.

5. The passive automatic shut-off valve according to claim 1, characterized in that: The valve core opener (5) comprises a sealed cavity opened on the lower valve body (4), a spring is provided in the sealed cavity, and a button handle is provided at one end of the spring through a sealing sheet.

6. A passive automatic shut-off valve according to claim 5, characterized in that: The upper half of the guide assembly is the upper valve body chamber, and the lower half of the guide assembly is the lower valve body chamber. A connecting hole 1 and a connecting hole 2 are respectively opened in the sealing cavity on the lower valve body (4). The connecting hole 1 is connected to the upper valve body chamber, and the connecting hole 2 is connected to the lower valve body chamber.

7. The passive automatic shut-off valve according to claim 6, characterized in that: The second communicating hole is located at one end of the sealing plate, and the first communicating hole is located at the other end of the sealing plate.

Images