Air and liquid inlet explosion-proof valve

Abstract

The utility model discloses an air and liquid inlet anti-explosion valve, which belongs to the technical field of anti-explosion valves and comprises a valve body, a valve seat, a pressure relief valve core and a fluid injection valve core. A valve cavity is formed in the valve body, and a pressure relief hole is formed in the side wall of the valve cavity. A fluid injection channel is formed in the pressure relief valve element, and the fluid injection valve element is arranged in the fluid injection channel. The gas and liquid inlet explosion-proof valve can be applied to containers in the fields of laboratories, chemical production, medical treatment, environmental protection industry, scientific research institutions and the like, gas or liquid in the containers is prevented from leaking in the gas or liquid storage and transportation process, and pollution to the environment and harm to human health are reduced; when the pressure in the container is too large, the pressure is released, accumulation and explosion of volatile gas in the container can be effectively prevented, and the problems that the explosion-proof potential safety hazard of the container is large, the sealing performance is insufficient, and gas or liquid transfer operation is inconvenient are solved.

Description

Technical Field

[0001] The utility model relates to an air and liquid inlet explosion-proof valve, belonging to the technical field of explosion-proof valves. Background Art

[0002] Laboratories, scientific research institutions, chemical companies, etc. often use and produce various gases or liquids. These gases or liquids have complex compositions and may be volatile, corrosive, or flammable and explosive. When storing, processing, extracting, using, or transferring these gases or liquids, there is a risk of explosion or leakage due to gas expansion or rapid increase of liquid, or when the physical or chemical properties of the gas or liquid change. Hospitals and other medical institutions use and produce various medical liquids or gases, such as high-risk chemical reagents, radioactive liquids, etc., during medical diagnosis, treatment, and scientific research. When these gases and liquids are used, if accidental leakage occurs due to insufficient sealing, it will endanger the safety of medical staff and the environment. When environmental protection companies handle and recycle waste liquids or gases, there is a risk of explosion or leakage due to the unstable properties of liquids or gases during the collection, transportation, and processing of gases and liquids. The explosion-proof valves used in the prior art generally only have pressure relief and explosion-proof functions and need to be installed independently on the container for use. The utility model aims to solve the problems of insufficient sealing, great explosion or leakage risks and inconvenient operation in the prior art when collecting, storing, transporting, processing, extracting, using or transferring gas and liquid. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides an air and liquid inlet explosion-proof valve, which can prevent the leakage of gas or liquid in the container during gas and liquid collection, storage, transportation, processing, extraction, use or transfer, and prevent the accumulation and explosion of volatile gas in the container.

[0004] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:

[0005] An air and liquid inlet explosion-proof valve comprises a valve body, a valve seat, a pressure relief valve core and a fluid injection valve core;

[0006] The valve body has a valve cavity extending in the axial direction, the valve cavity has a first port and a second port located at both ends of the axial direction, the valve seat blocks the first port of the valve cavity, the valve seat has a valve seat hole communicating with the valve cavity, and the side wall of the valve cavity has a pressure relief hole communicating with the annular cavity;

[0007] The pressure relief valve core is arranged in the valve cavity and extends from the second port of the valve cavity. An annular cavity is formed between the pressure relief valve core and the valve seat. The pressure relief valve core and the valve seat cooperate with each other to connect or cut off the annular cavity and the valve seat hole.

[0008] A fluid injection channel extending in the axial direction is provided inside the pressure relief valve core, and the fluid injection valve core is arranged in the fluid injection channel. The fluid injection valve core cooperates with the inner wall of the fluid injection channel to conduct or cut off the fluid injection channel;

[0009] When the annular cavity is connected to the valve seat hole, the fluid injection channel is cut off; when the fluid injection channel is connected, the annular cavity and the valve seat hole are cut off.

[0010] Preferably, the fluid injection valve core includes a ball, an end cover and an internal compression spring;

[0011] The fluid injection channel has a first port and a second port located at both ends of the axial direction, the first port of the fluid injection channel is located in the valve cavity and is arranged opposite to the valve seat hole, and the second port of the fluid injection channel extends from the valve cavity;

[0012] The end cap is sealed at the first port of the fluid injection channel, the end cap is provided with an end cap hole communicating with the fluid injection channel, and the sphere is arranged in the fluid injection channel;

[0013] The internal compression spring is squeezed and arranged between the sphere and the end cover. Under the elastic force of the internal compression spring, the sphere cuts off the fluid injection channel. When an external force opposite to the elastic force of the internal compression spring is applied to the sphere, the sphere opens the fluid injection channel.

[0014] Specifically, the outer diameter of the inner compression spring is larger than the aperture of the end cover hole.

[0015] Preferably, the sphere is connected to a guide rod, the inner compression spring is sleeved on the guide rod, and the outer diameter of the guide rod is smaller than the aperture of the end cover hole.

[0016] Preferably, the inner wall of the fluid injection channel is provided with an inner step surface of the channel, and the sphere is pressed and sealed against the inner step surface of the channel under the elastic force of the inner compression spring.

[0017] Preferably, the step surface in the channel is a conical surface.

[0018] Preferably, an external compression spring is sleeved on the middle part of the pressure relief valve core, the inner wall of the valve cavity is provided with a valve cavity inner step surface, the outer wall of the pressure relief valve core is surrounded by an annular boss, and the two ends of the external compression spring respectively abut against the valve cavity inner step surface and the annular boss.

[0019] Preferably, a sealing ring is provided on the first end of the pressure relief valve core, and the sealing ring is pressed and sealed against the valve seat hole under the elastic force of the external compression spring; when the fluid is injected into the valve core and an external force opposite to the elastic force of the external compression spring is applied, the sealing ring is separated from the valve seat, so that the annular cavity and the valve seat hole are connected.

[0020] Preferably, an annular groove is formed around the outer wall of the first end of the pressure relief valve core, and the sealing ring is embedded in the annular groove.

[0021] Preferably, a valve seat step surface is provided on the valve seat, and the sealing ring is in pressure contact with the valve seat step surface.

[0022] The beneficial effects of this application include but are not limited to:

[0023] The air and liquid inlet explosion-proof valve provided by the utility model adopts a purely physical structure, which is safer and more sensitive. A pressure relief valve core and a fluid injection valve core are provided in the valve body. When the container is not operated, the fluid injection valve core seals and blocks the fluid injection channel, and the pressure relief valve core seals and blocks the valve cavity, preventing the gas or liquid in the container from leaking through the explosion-proof valve. When gas or liquid is injected into the container, the pressure of the gas or liquid acts on the fluid injection valve core to open the fluid injection channel, allowing the gas or liquid to be smoothly injected into the container. At this time, the pressure relief valve core remains in a state of sealing and blocking the annular cavity, preventing the gas or liquid in the container from leaking from the explosion-proof valve. When the pressure in the container is too high, the pressure will act on the pressure relief valve core to open the annular cavity, allowing the pressure in the container to be discharged through the pressure relief hole.

[0024] The air and liquid explosion-proof valve provided by the utility model can be applied to containers in laboratories, chemical production, medical fields, environmental protection industries, scientific research institutions and other fields. It can prevent gas or liquid in the container from leaking during the storage and transportation of gas or liquid, thereby reducing pollution to the environment and harm to human health. When the pressure in the container is too high, the pressure is released, which can effectively prevent the accumulation and explosion of volatile gases in the container, and solve the problems of large safety hazards of container explosion-proof, insufficient sealing, and inconvenient gas or liquid transfer operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 This is a schematic diagram of the structure of the air and liquid inlet explosion-proof valve provided by the utility model;

[0027] Figure 2 A schematic diagram of the fluid injection state of the air and liquid inlet explosion-proof valve provided by the present invention;

[0028] Figure 3 This is a schematic diagram of the pressure relief state of the air and liquid inlet explosion-proof valve provided by the utility model;

[0029] In the figure, 100, valve body; 110, valve cavity; 120, step surface inside the valve cavity; 130, sealing ring; 140, annular groove; 200, valve seat; 210, valve seat hole; 220, valve seat step surface; 300, pressure relief valve core; 310, external compression spring; 320, annular boss; 400, fluid injection valve core; 410, sphere; 420, end cover; 421, end cover hole; 430, internal compression spring; 440, guide rod; 500, pressure relief hole; 600, fluid injection channel; 610, step surface inside the channel. DETAILED DESCRIPTION

[0030] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0031] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways other than those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0032] like Figure 1-Figure 3 As shown in FIG, the air and liquid inlet explosion-proof valve provided by the present invention includes a valve body 100, a valve seat 200, a pressure relief valve core 300 and a fluid injection valve core 400. Gas, liquid or gas-liquid mixture is collectively described as fluid.

[0033] exist Figure 1 In the orientation, the axial direction refers to the up and down direction. A valve cavity 110 extending in the axial direction is provided inside the valve body 100. The valve cavity 110 has a first port located at the axial lower end and a second port located at the axial upper end. The valve seat 200 blocks the first port of the valve cavity 110. A valve seat hole 210 communicating with the valve cavity 110 is provided on the valve seat 200. A pressure relief hole 500 communicating with the annular cavity is provided on the side wall of the valve cavity 110. The pressure relief holes 500 may be distributed circumferentially of the valve body 100 in a number.

[0034] The pressure relief valve core 300 is arranged in the valve cavity 110 and extends out of the valve cavity from the second port of the valve cavity 110. An annular cavity is formed between the pressure relief valve core 300 and the valve seat 200. The pressure relief valve core 300 and the valve seat 200 cooperate with each other to connect or cut off the annular cavity and the valve seat hole 210.

[0035] A fluid injection channel 600 extending axially is provided inside the pressure relief valve core 300 , and the fluid injection valve core 400 is arranged in the fluid injection channel 600 . The fluid injection valve core 400 cooperates with the inner wall of the fluid injection channel 600 to conduct or cut off the fluid injection channel 600 .

[0036] During the process of introducing gas or liquid into the container, fluid injection channel 600 is connected, allowing the fluid to enter the container smoothly. At the same time, the annular cavity and valve seat hole 210 are blocked, effectively preventing gas or liquid from leaking through the annular cavity. When the pressure in the container is too high, fluid injection channel 600 is blocked, and the annular cavity and valve seat hole 210 are connected, allowing the fluid to escape through the annular cavity and pressure relief hole 500, releasing the pressure in the container and preventing explosion.

[0037] In one specific embodiment, the fluid injection valve core 400 includes a ball 410 , an end cover 420 and an internal compression spring 430 .

[0038] The fluid injection channel 600 has a first port located at the axial lower end and a second port located at the axial upper end. The first port of the fluid injection channel 600 is located in the valve cavity 110 and is arranged opposite to the valve seat hole 210. The second port of the fluid injection channel 600 extends from the valve cavity 110.

[0039] The end cap 420 blocks the first port of the fluid injection channel 600 . The end cap 420 is provided with an end cap hole 421 communicating with the fluid injection channel 600 . The ball 410 is disposed in the fluid injection channel 600 .

[0040] The internal compression spring 430 is squeezed and set between the sphere 410 and the end cover 420. Under the elastic force of the internal compression spring 430, the sphere 410 cuts off the fluid injection channel 600; when an external force opposite to the elastic force of the internal compression spring 430 is applied to the sphere 410, the sphere 410 opens the fluid injection channel 600.

[0041] Specifically, the outer diameter of the inner compression spring 430 is larger than the aperture of the end cover hole 421 , so that the lower end of the inner compression spring 430 is maintained on the top of the end cover 420 .

[0042] like Figure 2 , which is a schematic diagram of the working state when the air and liquid inlet explosion-proof valve provided by the present invention is used to inject fluid into a container, with the arrow indicating the flow direction of the fluid. When gas or liquid is injected into the fluid injection channel 600, the pressure of the gas or liquid acts on the top of the sphere 410, causing the sphere 410 to move downward. At the same time, the internal compression spring 430 is further compressed, opening the fluid injection channel 600, allowing the gas or liquid to pass smoothly from the fluid injection channel 600 and enter the container through the valve seat hole 210 on the valve seat 200. When no fluid is injected, the sphere 410 is sealed against the inner wall of the fluid injection channel 600 by the elastic force of the internal compression spring 430, thereby blocking the fluid injection channel 600 and ensuring the sealing performance of the air and liquid inlet explosion-proof valve.

[0043] In order to guide the movement direction of the sphere 410 and the internal compression spring 430 and prevent the movement direction from being deviated, in a preferred embodiment, a guide rod 440 is connected to the sphere 410, and the internal compression spring 430 is sleeved on the guide rod 440. The outer diameter of the guide rod 440 is smaller than the aperture of the end cover hole 421, so that the sphere 410 and the internal compression spring 430 move along the axial direction of the guide rod 440.

[0044] Preferably, the inner wall of the fluid injection channel 600 is provided with an inner channel step surface 610 , and the ball 410 is pressed and sealed against the inner channel step surface 610 under the elastic force of the inner compression spring 430 .

[0045] Specifically, the outer diameter of sphere 410 is larger than the inner diameter of fluid injection channel 600 above the inner step surface 610, and smaller than the inner diameter of fluid injection channel 600 below the inner step surface 610. When sphere 410 presses against the inner step surface 610, it cuts off the fluid injection channel 600 above and below the inner step surface 610. The small outer diameter of sphere 410 forms a passage for fluid flow between it and the fluid injection channel 600 below the inner step surface 610. When sphere 410 leaves the inner step surface 610, fluid can flow smoothly through the fluid injection channel 600.

[0046] Preferably, the inner step surface 610 of the channel is a conical surface, which can increase the extrusion contact area between the sphere 410 and the inner step surface 610 of the channel.

[0047] In order to control the movement of the pressure relief valve core 300 so that the pressure relief valve core 300 can conduct or cut off the annular cavity under different conditions, in one specific embodiment, an external compression spring 310 is sleeved on the middle part of the pressure relief valve core 300, and the inner wall of the valve cavity 110 is provided with a valve cavity inner step surface 120. The outer wall of the pressure relief valve core 300 is surrounded by an annular boss 320, and the two ends of the external compression spring 310 are respectively abutted against the valve cavity inner step surface 120 and the annular boss 320.

[0048] Under the elastic force of the external compression spring 310, the pressure relief valve core 300 is subjected to a downward force, so that the pressure relief valve core 300 and the valve seat 200 are pressed and sealed, blocking the annular cavity to prevent gas or liquid from leaking out through the annular cavity and the pressure relief hole 500 when air or liquid is introduced.

[0049] like Figure 3 Figure 1 shows the pressure relief status of the air and liquid inlet explosion-proof valve provided by the utility model. Arrows indicate the direction of fluid flow. When the pressure within the container exceeds the set value, the pressure relief valve core 300 and the fluid injection valve core 400 are subjected to an upward force, causing the pressure relief valve core 300 to move upward. This further compresses the external compression spring 310, opening the annular cavity. Pressure within the container can then be released through the annular cavity and pressure relief hole 500, preventing explosions. In practical applications, valve parameters can be designed based on the explosion-proof pressure.

[0050] Preferably, a sealing ring 130 is sleeved on the first end of the pressure relief valve core 300, and the sealing ring 130 is pressed and sealed against the valve seat hole 210 under the elastic force of the external compression spring 310; when the pressure in the container is too large, the pressure in the container will act on the fluid injection valve core 400 and the pressure relief valve core 300, and the fluid injection valve core 400 moves upward due to the external force opposite to the elastic force of the external compression spring 310, and the sealing ring 130 is separated from the valve seat 200, so that the annular cavity and the valve seat hole 210 are connected, and the container pressure is discharged through the annular cavity and the pressure relief hole 500.

[0051] Preferably, an annular groove 140 is formed around the outer wall of the first end of the pressure relief valve core 300, and the sealing ring 130 is embedded in the annular groove 140 to prevent the sealing ring 130 from falling off.

[0052] Furthermore, a valve seat step surface 220 is provided on the valve seat 200 , and the sealing ring 130 presses, contacts and seals against the valve seat step surface 220 .

[0053] It should be noted that in order to facilitate assembly and to combine the various structures in an orderly manner, and to prevent the pressure relief valve core 300 from detaching from the valve cavity 110 due to excessive pressure, the air and liquid intake explosion-proof valve provided by the present invention will usually also provide mutually cooperating step surfaces on the upper part of the pressure relief valve core 300 and the upper part of the valve cavity 110, and mutually cooperating step surfaces on the lower part of the pressure relief valve core 300 and the upper part of the valve seat 200.

[0054] In order to facilitate the connection of the air inlet pipe or the liquid inlet pipe, an air inlet connector or a liquid inlet connector may be extended from the upper end of the pressure relief valve core.

[0055] The method of using the air and liquid inlet explosion-proof valve provided by the utility model is as follows:

[0056] During use, the inlet and liquid explosion-proof valve provided by this utility model is installed on the container to ensure a good seal with the container. During the process of injecting gas or liquid into the container, if the pressure exceeds the safe value, the pressure relief valve automatically opens to release the pressure. At the same time, the other parts of the explosion-proof valve maintain a good seal at all times to prevent gas or liquid leakage. When injection is complete, the operator shuts off the gas or liquid supply to ensure the container is sealed.

[0057] The air and liquid inlet explosion-proof valve provided by the utility model is usually installed on the sealing cover of the container for use. The material of the explosion-proof valve is selected according to various actual environments such as high pressure, vacuum, ultra-low temperature, ultra-high temperature, strong radiation, strong acid, strong alkali, organic solvent, etc., and needs to have good pressure resistance and corrosion resistance; the shape and size of the explosion-proof valve can be closely matched with sealing covers of different specifications, and it can be completely sealed through reasonable structural design.

[0058] The air and liquid inlet explosion-proof valve provided by the utility model can, when used in laboratories, chemical industry, medical treatment, environmental protection and other industries, (1) prevent leakage and pollution: by effectively sealing the storage or transfer of various gases or solutions, the corrosion damage to the equipment caused by gas and liquid leakage is avoided, thereby extending the service life of the equipment; (2) reduce the risk of fire and explosion: for flammable and explosive gases or solutions, good sealing can prevent the gas or solution from contacting with the air, reducing the possibility of fire or explosion.

[0059] Specifically, various gases and liquids are often produced in laboratories. These gases and liquids have complex compositions and may be volatile, corrosive, flammable, or explosive. The inlet and liquid explosion-proof valves provided by this utility model can ensure that during gas-liquid transfer, the risk of explosion or leakage caused by gas expansion, rapid increase in liquid volume, or changes in chemical properties in the container is avoided.

[0060] Chemical companies use or generate large quantities of industrial liquids or gases during their production processes. These liquids or gases have complex compositions and may be volatile, corrosive, flammable, or explosive. The inlet and liquid explosion-proof valves provided by this utility model can be used to safely transfer gases or liquids and prevent accidents in various stages of chemical production, such as raw material storage, intermediate product processing, and finished product post-processing.

[0061] Hospitals and medical institutions use and produce various medical fluids and gases, such as chemical reagents and radioactive liquids, during medical diagnosis, treatment, and scientific research. The inlet and liquid explosion-proof valves provided by this utility model ensure the safety of medical personnel and the environment when handling these gases and liquids. This role is particularly important in medical procedures involving high-risk chemicals or radioactive substances.

[0062] When environmental protection enterprises are processing and recycling liquids or gases, the air and liquid inlet explosion-proof valve provided by the utility model can prevent explosions or leakages caused by the unstable properties of liquids or gases during the collection, transportation and processing of gases and liquids, thereby ensuring the smooth progress of environmental protection work.

[0063] When conducting various scientific research, scientific research institutions may use or produce different types of gases or liquids. These substances may be volatile, corrosive, flammable or explosive. The gas and liquid inlet explosion-proof valve provided by this utility model can provide a safe liquid handling method, ensuring the smooth progress of scientific research experiments and the safety of personnel.

[0064] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0065] In this utility model, unless otherwise specified or limited, the terms "disposed," "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0066] Anything not described in detail in the present invention is well known to those skilled in the art.

Claims

1. An air and liquid inlet explosion-proof valve, characterized in that: Including valve body, valve seat, pressure relief valve core and fluid injection valve core; A valve cavity extending in the axial direction is defined inside the valve body, the valve seat blocks the first port of the valve cavity, a valve seat hole communicating with the valve cavity is defined on the valve seat, and a pressure relief hole communicating with the annular cavity is defined on the side wall of the valve cavity; The pressure relief valve core is arranged in the valve cavity and extends from the second port of the valve cavity. An annular cavity is formed between the pressure relief valve core and the valve seat. The pressure relief valve core and the valve seat cooperate with each other to connect or cut off the annular cavity and the valve seat hole. A fluid injection channel extending in the axial direction is provided inside the pressure relief valve core, and the fluid injection valve core is arranged in the fluid injection channel. The fluid injection valve core cooperates with the inner wall of the fluid injection channel to conduct or cut off the fluid injection channel; When the annular cavity is connected to the valve seat hole, the fluid injection channel is cut off; when the fluid injection channel is connected, the annular cavity is cut off from the valve seat hole.

2. The air and liquid inlet explosion-proof valve according to claim 1, characterized in that: The fluid injection valve core includes a ball, an end cover and an internal compression spring; The first port of the fluid injection channel is located in the valve cavity, and the second port of the fluid injection channel extends from the valve cavity; The end cap is sealed at the first port of the fluid injection channel, the end cap is provided with an end cap hole communicating with the fluid injection channel, and the sphere is arranged in the fluid injection channel; The inner pressure spring is squeezed and arranged between the sphere and the end cover, and the sphere cuts off the fluid injection channel under the elastic force of the inner pressure spring.

3. The air and liquid inlet explosion-proof valve according to claim 2, characterized in that: The sphere is connected with a guide rod, the inner compression spring is sleeved on the guide rod, and the outer diameter of the guide rod is smaller than the aperture of the end cover hole.

4. The air and liquid inlet explosion-proof valve according to claim 2, characterized in that: The inner wall of the fluid injection channel is provided with an inner step surface of the channel, and the ball is pressed and sealed against the inner step surface of the channel under the elastic force of the inner compression spring.

5. The air and liquid inlet explosion-proof valve according to claim 4, characterized in that: The step surface in the channel is a conical surface.

6. The air and liquid inlet explosion-proof valve according to claim 1, characterized in that: An external compression spring is sleeved on the middle part of the pressure relief valve core, an inner step surface is provided on the inner wall of the valve cavity, an annular boss is provided around the outer wall of the pressure relief valve core, and both ends of the external compression spring abut against the inner step surface and the annular boss of the valve cavity respectively.

7. The air and liquid inlet explosion-proof valve according to claim 1, characterized in that: A sealing ring is sleeved on the first end of the pressure relief valve core, and the sealing ring is pressed and sealed against the valve seat hole under the elastic force of the external compression spring.

8. The air and liquid inlet explosion-proof valve according to claim 7, characterized in that: An annular groove is formed around the outer wall of the first end of the pressure relief valve core, and the sealing ring is embedded in the annular groove.

9. The air and liquid inlet explosion-proof valve according to claim 7, characterized in that: The valve seat is provided with a valve seat step surface, and the sealing ring is in pressure contact with the valve seat step surface.

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