Carbon dioxide cylinder and cylinder pressure maintaining valve

Abstract

The application discloses a carbon dioxide cylinder and a cylinder pressure maintaining valve. The cylinder pressure maintaining valve comprises a valve body, two communicating valve ports, two groups of pressure maintaining valve core assemblies arranged in the valve body, and a cylinder gas discharge channel arranged in the valve body. Each pressure maintaining valve core assembly comprises a valve core and an elastic body. The valve core is slidably arranged in the valve body, and the elastic body and the valve core are sleeved with each other. The two ends of the elastic body abut against the valve core and the valve body, respectively. The two groups of pressure maintaining valve core assemblies are arranged in the two valve ports, respectively. The two valve cores are coaxially connected and slidably sealed. The compression directions of the two elastic bodies are opposite. The two cylinder gas discharge channels extend from the two valve ports to the sliding sealing surfaces of the two valve cores, respectively. The content in the cylinder flows into one of the valve ports to compress the elastic body in the other valve port, so that the cylinder is discharged. The elastic body rebounds to maintain the pressure of the cylinder. The cylinder pressure maintaining valve can be used bidirectionally, meets the discharge and pressure maintaining requirements of the cylinder, is safer, more convenient to use, and has more use modes.

Description

Technical Field

[0001] This application relates to the field of gas storage technology, and more particularly to a gas cylinder pressure-holding valve. It also relates to a carbon dioxide cylinder, including the aforementioned gas cylinder pressure-holding valve. Background Technology

[0002] Carbon dioxide cylinders are used to store carbon dioxide. The carbon dioxide stored in the cylinder exists in both liquid and gaseous states. When using the carbon dioxide in the cylinder, pressure is applied to the liquid carbon dioxide using gaseous carbon dioxide to cause the liquid carbon dioxide to be ejected.

[0003] For carbon dioxide cylinders, when the liquid carbon dioxide inside is used up, the cylinder can be considered to have been degassed. At this point, although the cylinder still contains gaseous carbon dioxide and is under positive pressure, this gaseous carbon dioxide cannot be released. Otherwise, it will pose a safety hazard when the cylinder is refilled with liquid carbon dioxide.

[0004] However, due to varying skill levels among operators, some operators may mistakenly believe that the carbon dioxide cylinder can still release gas after it has been depressurized, as the cylinder may still be under positive pressure. This results in the gaseous carbon dioxide inside the cylinder being released into the outside environment.

[0005] In summary, improving the operational safety of carbon dioxide cylinders has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to provide a pressure-holding valve for gas cylinders, which can be used in gas storage tanks such as carbon dioxide cylinders to maintain pressure, limit the leakage of the aforementioned gas storage tank, and prevent the contents of the aforementioned gas storage tank from being completely discharged. Another purpose of this application is to provide a carbon dioxide cylinder including the aforementioned pressure-holding valve.

[0007] To achieve the above objectives, this application provides a gas cylinder pressure-holding valve, including a valve body; the valve body includes two communicating valve ports;

[0008] The valve body is provided with two sets of pressure-holding valve core assemblies; each set of pressure-holding valve core assemblies includes a valve core and an elastic body. The valve core is slidably installed in the valve body, and the elastic body and the valve core are nested together. The two ends of the elastic body along the extension and contraction direction abut against the valve core and the valve body respectively; the two sets of pressure-holding valve core assemblies are respectively located in two valve ports. The two valve cores are coaxially connected and slide sealed, and the compression directions of the two elastic bodies are opposite.

[0009] The valve body is provided with two gas cylinder venting channels, which extend from the two valve ports to the sliding sealing surfaces of the two valve cores respectively.

[0010] The contents of the gas cylinder flow in from one of the valve ports to compress the elastic body in the other valve port, thereby releasing gas from the gas cylinder. The elastic body then rebounds to maintain pressure in the gas cylinder.

[0011] In some embodiments, the two valve cores include valve core I and valve core II; valve core I is in the shape of a hollow sleeve, and valve core II is in the shape of a solid plunger; adjacent ends of valve core I and valve core II each include an umbrella-shaped cap, the umbrella-shaped caps of valve core I and valve core II are distributed in opposite directions, and the valve body, the umbrella-shaped cap of valve core I and the umbrella-shaped cap of valve core II are slidably and sealingly fitted from the outside to the inside; the other end of valve core I and the other end of valve core II are respectively slidably and sealingly fitted to the valve body;

[0012] One gas cylinder venting channel extends from inside valve core I to the outer end face of the umbrella-shaped cap of valve core II, and from outside valve core I to the inner end face of the umbrella-shaped cap of valve core I; the other gas cylinder venting channel extends from outside valve core II to the outer end face of the umbrella-shaped cap of valve core I and the inner end face of the umbrella-shaped cap of valve core II.

[0013] In some embodiments, the valve body is provided with valve seat I and valve seat II; valve seat I and valve seat II are respectively fixed in two valve ports; valve core I is slidably inserted into valve seat I, and valve core II is slidably inserted into valve seat II; the two elastic bodies include elastic body I and elastic body II, elastic body I is sleeved on valve core I, and the two ends of elastic body I abut against the inner end face of the umbrella-shaped cap of valve core I and valve seat I respectively, and elastic body II is sleeved on valve core II, and the two ends of elastic body II abut against the inner end face of the umbrella-shaped cap of valve core II and valve seat II respectively.

[0014] In some embodiments, both valve seat I and valve seat II are provided with valve core mounting holes and venting passage holes; a plurality of venting passage holes are arranged in a ring around the valve core mounting holes.

[0015] In some embodiments, the cross-section of any venting passage hole is an arc-shaped elliptical hole, and all venting passage holes are distributed on the same circumference of the valve core.

[0016] In some embodiments, sealing rings are provided between the contact surfaces of the valve body and valve core I, and between the contact surfaces of valve core I and valve core II.

[0017] In some embodiments, the two valve ports are identical and both are matched to the pressure-holding valve interface on the neck of the gas cylinder body.

[0018] In some embodiments, the two sets of pressure-holding valve core assemblies have the same pressure holding value.

[0019] This application also provides a carbon dioxide cylinder, including a cylinder body and the aforementioned cylinder pressure holding valve; the cylinder pressure holding valve is located at the bottleneck of the cylinder body.

[0020] In some embodiments, a cylinder hand valve is also included; the cylinder hand valve and the cylinder pressure holding valve are connected in parallel at the cylinder bottleneck.

[0021] Compared to the aforementioned background technology, the gas cylinder pressure-holding valve provided in this application includes a valve body; the valve body includes two communicating valve ports;

[0022] The valve body is provided with two sets of pressure-holding valve core assemblies; each set of pressure-holding valve core assemblies includes a valve core and an elastic body. The valve core is slidably installed in the valve body, and the elastic body and the valve core are nested together. The two ends of the elastic body along the extension and contraction direction abut against the valve core and the valve body respectively; the two sets of pressure-holding valve core assemblies are respectively located in two valve ports. The two valve cores are coaxially connected and slide sealed, and the compression directions of the two elastic bodies are opposite.

[0023] The valve body is provided with two gas cylinder venting channels, which extend from the two valve ports to the sliding sealing surfaces of the two valve cores respectively.

[0024] The contents of the gas cylinder flow in from one of the valve ports to compress the elastic body in the other valve port, thereby releasing gas from the gas cylinder. The elastic body then rebounds to maintain pressure in the gas cylinder.

[0025] The gas cylinder pressure-holding valve provided in this application can be used in both directions, meaning it can be connected to the gas cylinder body through either valve port to meet the gas cylinder body's venting requirements during normal use and the pressure-holding requirements after venting. Based on this bidirectional characteristic, the gas cylinder pressure-holding valve offers higher safety, greater convenience, and more diverse usage methods; it can be used to maintain pressure on the gas cylinder body as well as to add contents to the gas cylinder body. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a carbon dioxide cylinder provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the gas cylinder pressure-holding valve provided in the embodiments of this application;

[0029] Figure 3 This is a schematic diagram of the valve core I provided in the embodiments of this application;

[0030] Figure 4 This is a schematic diagram of the valve seat provided in an embodiment of this application.

[0031] Among them, 01-Cylinder body, 02-Cylinder hand valve, 1-Valve body, 11-Valve port, 21-Valve core I, 22-Valve core II, 31-Elastomer I, 32-Elastomer II, 41-Valve seat I, 42-Valve seat II, 410-Valve core mounting hole, 420-Vent venting passage hole, 5-Sealing ring. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of a carbon dioxide cylinder provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the gas cylinder pressure-holding valve provided in the embodiments of this application; Figure 3 This is a schematic diagram of the valve core I provided in the embodiments of this application; Figure 4 This is a schematic diagram of the valve seat provided in an embodiment of this application.

[0035] Please refer to Figure 1 and Figure 2 This application provides a gas cylinder pressure holding valve, including a valve body 1, two sets of pressure holding valve core assemblies disposed in the valve body 1, and two gas cylinder venting channels disposed in the valve body 1; the valve body 1 of the gas cylinder pressure holding valve includes two communicating valve ports 11, the two sets of pressure holding valve core assemblies are respectively disposed in the two valve ports 11, and the two gas cylinder venting channels extend from the two valve ports 11 toward the middle of the valve body 1.

[0036] In this gas cylinder pressure-holding valve, any set of pressure-holding valve core assemblies includes a valve core and an elastic body. The elastic body and the valve core are nested together. The valve core is slidably installed inside the valve body 1, and the two ends of the elastic body along the extension and contraction direction respectively abut against the valve core and the valve body 1. It can be seen that the sliding of the valve core within the valve body 1 compresses the elastic body, and the rebound of the compressed elastic body causes the valve core to slide in the opposite direction within the valve body 1. Two sets of pressure-holding valve core assemblies are respectively located in two valve ports 11. The valve cores of these two sets of pressure-holding valve core assemblies are coaxially connected and slide sealed. The compression directions of the elastic bodies in these two sets of pressure-holding valve core assemblies are opposite.

[0037] In this gas cylinder pressure-holding valve, two gas cylinder venting channels extend from the two valve ports 11 toward the middle of the valve body 1. The two gas cylinder venting channels are located on both sides of the sliding sealing surface of the two valve cores. For example, the valve body 1 is laterally distributed, and the left and right sides of the valve body 1 are respectively provided with valve ports 11 and gas cylinder venting channels. The two sets of pressure-holding valve core assemblies are respectively located in the two valve ports 11. The two sets of pressure-holding valve core assemblies are in contact with each other in the middle of the valve body 1 to achieve sliding sealing. It can be seen that the sliding sealing surface of the two sets of pressure-holding valve core assemblies is located in the middle of the valve body 1, while the two valve ports 11 and the two gas cylinder venting channels are located on both sides of the aforementioned sliding sealing surface.

[0038] When using the gas cylinder pressure-holding valve provided in this application, any one of the valve ports 11 of the valve body 1 can be connected to the gas cylinder body 01. For example, the two valve ports 11 of the valve body 1 are the first valve port 11 and the second valve port 11, respectively. The first valve port 11 can be connected to the gas cylinder body 01. When the contents of the gas cylinder body 01 are sufficient, the pressure inside the gas cylinder body 01 is high. The contents inside the gas cylinder body 01 can flow from the first valve port 11 to the second valve port 11, pushing the pressure-holding valve core assembly inside the second valve port 11 to move and compress the elastic body inside the second valve port 11, so that the two gas cylinder venting channels are connected, and the gas cylinder body 01 is vented. When a large amount of contents flow out of the gas cylinder body 01, the pressure inside the gas cylinder body 01 decreases. The contents inside the gas cylinder body 01 are insufficient to maintain the compressed state of the elastic body inside the second valve port 11. In other words, the elastic body inside the second valve port 11 rebounds. The rebounding elastic body can drive the connected pressure-holding valve core assembly to reset and move, causing the two sets of pressure-holding valve core assemblies to re-seal and connect, so that the two gas cylinder venting channels are disconnected from each other. At this time, the gas cylinder body 01 is in a pressure-holding state. Of course, the second valve port 11 of the valve body 1 can also be connected to the gas cylinder body 01, which can also meet the gas cylinder body 01's gas release and pressure holding requirements.

[0039] In summary, the gas cylinder pressure-holding valve provided in this application can be connected to the gas cylinder body 01 via any of its valve ports 11, satisfying both the gas cylinder body 01's venting requirements during normal use and its pressure-holding requirements after venting. This means the gas cylinder pressure-holding valve provided in this application can be used in both directions. Based on this bidirectional characteristic, the gas cylinder pressure-holding valve offers higher safety, greater convenience, and more diverse usage methods.

[0040] The high safety of this cylinder pressure-holding valve is reflected in the fact that when the pressure-holding design values ​​of both sets of pressure-holding valve core assemblies are not less than the pressure-holding requirements of the cylinder body 01, the operator does not need to distinguish between the two valve ports 11 of the cylinder pressure-holding valve. Connecting either valve port 11 to the cylinder body 01 will meet the installation and use requirements of the cylinder pressure-holding valve, avoiding valve failure due to incorrect valve installation direction.

[0041] The convenience of using this cylinder pressure-holding valve is that the operator can install the cylinder pressure-holding valve on one side of the cylinder body 01, without having to install the cylinder pressure-holding valve inside the cylinder body 01. In other words, one of the valve ports 11 of the cylinder pressure-holding valve can be connected to the cylinder body 01 while the other valve port 11 is left unattended to the outside, which reduces the difficulty of installing and disassembling the cylinder pressure-holding valve.

[0042] The gas cylinder pressure holding valve has a more diverse range of uses. When the pressure holding design values ​​of the two sets of pressure holding valve core components of the gas cylinder pressure holding valve are different, the operator can change the connection direction between the gas cylinder pressure holding valve and the gas cylinder body 01, thereby exerting different pressure holding effects on the gas cylinder body 01. Based on the different pressure holding effects exerted by the gas cylinder pressure holding valve on the gas cylinder body 01, the operator can indirectly control the amount of gas leakage from the gas cylinder body 01 by controlling the amount of contents remaining in the gas cylinder body 01.

[0043] The pressure-holding valve for gas cylinders provided in this application will be further described below with reference to the accompanying drawings and embodiments.

[0044] For reference Figure 2 and Figure 3 In some embodiments, the pressure-holding valve of the gas cylinder includes two valve cores: valve core I21 and valve core II22. Valve core I21 is a hollow sleeve, and valve core II22 is a solid plunger. One end of valve core I21 and valve core II22 are adjacent to each other and each includes an umbrella-shaped cap. The umbrella-shaped caps of valve core I21 and valve core II22 are distributed in opposite directions. The other ends of valve core I21 and valve core II22 are slidably sealed to valve body 1. Valve body 1, the umbrella-shaped caps of valve core I21 and valve core II22 are arranged from the outside inwards. The inner cylinder is sequentially slidably sealed; at the same time, the two cylinder venting channels of the cylinder pressure holding valve extend from the two valve ports 11 to the sliding sealing surfaces of valve core I21 and valve core II22 respectively. One cylinder venting channel extends from the inside of valve core I21 to the outer end face of the umbrella-shaped cap of valve core II22, and at the same time extends from the outside of valve core I21 to the inner end face of the umbrella-shaped cap of valve core I21. The other cylinder venting channel extends from the outside of valve core II22 to the outer end face of the umbrella-shaped cap of valve core I21 and the inner end face of the umbrella-shaped cap of valve core II22.

[0045] In the above embodiment, the valve body 1 includes two valve ports 11, and two sets of pressure-holding valve core assemblies are provided inside the valve body 1. One set of pressure-holding valve core assemblies includes valve core I21, and the other set includes valve core II22. Both sets of pressure-holding valve core assemblies are located inside the valve body 1 and are respectively close to the two valve ports 11. The adjacent ends of valve core I21 and valve core II22 both include umbrella-shaped caps. Since valve core I21 is a hollow sleeve and valve core II22 is a solid plunger, the umbrella-shaped cap of valve core I21 is a hollow structure and the umbrella-shaped cap of valve core II22 is a solid structure. The umbrella-shaped caps of valve core I21 and valve core II22 are coaxially connected and slide sealed, specifically, the umbrella-shaped cap of valve core II22 passes through and slides sealed to the umbrella-shaped cap of valve core I21. Since the umbrella-shaped caps of valve body 1, valve core I21 and valve core II22 are sequentially slidably sealed from the outside to the inside, it can be seen that valve body 1 is fitted around the outer periphery of the umbrella-shaped cap of valve core I21, while the umbrella-shaped cap of valve core II22 is inserted into the umbrella-shaped cap of valve core I21.

[0046] For reference Figure 1 and Figure 2 In the above embodiment, the two gas cylinder venting channels extend from the two valve ports 11 of the valve body 1 towards the middle of the valve body 1. Wherein, located... Figure 2 The gas cylinder venting channel on the right side is divided into two parts. One part extends from the inside of valve core I21 to the outer end face of the umbrella-shaped cap of valve core II22. When the contents of the gas cylinder body 01 flow into this part of the venting channel, the contents exert pressure on the outer end face of the umbrella-shaped cap of valve core II22, pushing valve core II22 and its umbrella-shaped cap to the left. At the same time, the other part extends from the outside of valve core I21 to the inner end face of the umbrella-shaped cap of valve core I21. When the contents of the gas cylinder body 01 flow into this part of the venting channel, the contents exert pressure on the inner end face of the umbrella-shaped cap of valve core I21. Due to the assembly relationship between valve body 1 and the umbrella-shaped cap of valve core I21, valve core I21 and its umbrella-shaped cap cannot move to the left. Figure 2 The gas cylinder venting channel on the left side extends from the outside of valve core II22 to the outer end face of the umbrella-shaped cap of valve core I21 and the inner end face of the umbrella-shaped cap of valve core II22. When the contents of the gas cylinder body 01 flow in along the aforementioned gas cylinder venting channel, the contents exert pressure on the outer end face of the umbrella-shaped cap of valve core I21, pushing valve core I21 and its umbrella-shaped cap to move to the right, and also extend to the inner end face of the umbrella-shaped cap of valve core II22, pushing valve core II22 and its umbrella-shaped cap to move to the right.

[0047] It is evident that, for Figure 2Regarding the gas cylinder pressure holding valve shown, if the valve port 11 at the right end of the gas cylinder pressure holding valve is connected to the gas cylinder body 01, when the contents of the gas cylinder body 01 are sufficient, the contents of the gas cylinder body 01 flow to the left along the gas cylinder venting channel on the right side of the gas cylinder pressure holding valve. The contents entering the aforementioned gas cylinder venting channel can push valve core II22 to move to the left but cannot push valve core I21 to move to the left. This causes the umbrella-shaped caps of valve core I21 and valve core II22 to separate from each other, thereby connecting the gas cylinder venting channels on the left and right sides of the gas cylinder pressure holding valve, allowing the contents of the gas cylinder body 01 to flow out smoothly and achieve gas release.

[0048] If the valve port 11 at the left end of the gas cylinder pressure holding valve is connected to the gas cylinder body 01, when the contents of the gas cylinder body 01 are sufficient, the contents of the gas cylinder body 01 flow to the right along the gas cylinder venting channel on the left side of the gas cylinder pressure holding valve. The contents entering the aforementioned gas cylinder venting channel can push valve core I21 and valve core II22 to move to the right, which causes the umbrella-shaped caps of valve body 1 and valve core I21 to separate from each other, thereby connecting the gas cylinder venting channels on the left and right sides of the gas cylinder pressure holding valve, so that the contents of the gas cylinder body 01 can flow out smoothly, thus achieving gas release.

[0049] Of course, in the above embodiments, once the contents inside the gas cylinder body 01 have been completely degassed, the amount of contents inside the gas cylinder body 01 is limited, and the pressure inside the gas cylinder body 01 is limited. This pressure is insufficient to push valve core I21 and valve core II22 to move, nor is it sufficient to maintain the compressed state of the elastic body of valve core I21 or the elastic body of valve core II22. In other words, the compressed elastic body can rebound, thereby driving the corresponding valve core to reset, thus disconnecting the gas cylinder degassing channels on the left and right sides of the gas cylinder pressure holding valve from each other, preventing the contents inside the gas cylinder body 01 from continuing to flow outward, and thus achieving pressure holding.

[0050] In the above embodiments, the elastic bodies of the two sets of pressure-holding valve core assemblies can be sleeved on the valve core and disposed between the umbrella-shaped cap of the valve core and the valve body 1, which can still be referred to Figure 2 ,lie in Figure 2 The elastic body of the pressure-holding valve core assembly on the right side is sleeved on the outer periphery of the valve core I21, and the two ends of the elastic body abut against the umbrella-shaped cap of the valve core I21 and the valve body 1, respectively; located in Figure 2 The elastic body of the pressure-holding valve core assembly on the left side is sleeved on the outer periphery of the valve core II22, and the two ends of the elastic body abut against the umbrella-shaped cap of the valve core II22 and the valve body 1, respectively.

[0051] In some embodiments, valve body 1 is further provided with valve seat I41 and valve seat II42, which can be referred to Figure 2Valve seat I41 and valve seat II42 can be fixed in the two valve ports 11 respectively. In this embodiment, the valve cores of the two sets of pressure-holding valve core assemblies include valve core I21 and valve core II22. Valve core I21 is slidably inserted into valve seat I41, and valve core II22 is slidably inserted into valve seat II42. At the same time, the elastic bodies of the two sets of pressure-holding valve core assemblies include elastic body I31 and elastic body II32. Elastic body I31 is sleeved on valve core I21, and the two ends of elastic body I31 abut against the inner end face of the umbrella-shaped cap of valve core I21 and valve seat I41 respectively. Elastic body II32 is sleeved on valve core II22, and the two ends of elastic body II32 abut against the inner end face of the umbrella-shaped cap of valve core II22 and valve seat II42 respectively.

[0052] For reference Figure 2 and Figure 4 In the above embodiments, either valve seat I41 or valve seat II42 may be provided with a valve core mounting hole 410 and a venting channel hole 420. Obviously, the valve core mounting hole 410 is used to install the valve core, and the gas cylinder venting channel includes the venting channel hole 420; wherein, a plurality of venting channel holes 420 are arranged in a ring around the valve core mounting hole 410.

[0053] The cross-section of any one of the venting passage holes 420 is an arc-shaped elliptical hole, and all the venting passage holes 420 are distributed on the same circumference of the valve core, achieving a uniform ring distribution with the valve core mounting hole 410 as the center.

[0054] Typically, in some embodiments, a sealing ring 5 is provided between the contact surfaces of the valve body 1 and the valve core I21, and at the same time, a sealing ring 5 is also provided between the contact surfaces of the valve core I21 and the valve core II22, which can ensure the sliding sealing performance of the corresponding contact surfaces.

[0055] In addition, in some embodiments, the two valve ports 11 of the gas cylinder pressure holding valve are identical, including having the same shape and size. Both valve ports 11 are matched with the pressure holding valve interface on the neck of the gas cylinder body 01. The operator can connect either valve port 11 of the gas cylinder pressure holding valve to the pressure holding valve interface of the gas cylinder body 01.

[0056] Typically, the two pressure-holding valve core assemblies of this gas cylinder pressure-holding valve have the same pressure-holding value. For example, the pressure-holding value of both sets of pressure-holding valve core assemblies can be set to 0.7 mPA. This pressure-holding value is less than the working pressure inside the gas cylinder body 01 and greater than the residual pressure after the gas cylinder body 01 has been depressurized. The pressure-holding value of the pressure-holding valve core assembly is affected by various factors such as the elasticity of the elastomer, the shape and size of the valve core, etc.

[0057] For reference Figure 1 and Figure 2Based on the various embodiments provided above, this application also provides a carbon dioxide cylinder, including a cylinder body 01 and a cylinder pressure holding valve mentioned in the various embodiments above; in the carbon dioxide cylinder, the cylinder pressure holding valve is located at the bottleneck of the cylinder body 01. For example, the bottleneck of the cylinder body 01 is provided with a pressure holding valve interface, and one valve port 11 of the cylinder pressure holding valve is connected to the pressure holding valve interface of the cylinder body 01.

[0058] Based on the above embodiments, the carbon dioxide cylinder provided in this application further includes a cylinder hand valve 02; wherein, the cylinder hand valve 02 and the cylinder pressure holding valve are connected in parallel at the cylinder neck, for example, see reference Figure 1 and Figure 2 The cylinder body 01 has a neck with an upward and a leftward passage. The cylinder hand valve 02 is located in the upward passage of the cylinder body 01, and the cylinder pressure holding valve is located in the leftward passage of the cylinder body 01.

[0059] The carbon dioxide inside the carbon dioxide cylinder is in a gas-liquid mixture state; typically, the carbon dioxide at the neck is gaseous, and the carbon dioxide at the bottom is liquid. When the cylinder's manual valve 02 is opened, the gaseous carbon dioxide exerts pressure on the liquid carbon dioxide. At this time, the pressure on the valve core of the cylinder's pressure-holding valve is greater than the pressure on the valve's elastic body, keeping the pressure-holding valve open and allowing the liquid carbon dioxide to be expelled outwards through the siphon tube inside the cylinder. As the liquid carbon dioxide continues to be expelled, the pressure in the cylinder continuously decreases. When the liquid carbon dioxide is completely released, the pressure of the gaseous carbon dioxide is insufficient to open the pressure-holding valve. In other words, the pressure on the valve core of the pressure-holding valve is less than the pressure on the valve's elastic body, keeping the pressure-holding valve closed and the cylinder in a pressure-holding state.

[0060] The carbon dioxide cylinder and cylinder pressure-holding valve provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A cylinder pressure retaining valve characterized by, The valve body (1) includes two communicating valve ports (11); Two groups of pressure maintaining valve core assemblies are arranged in the valve body (1); any one group of the pressure maintaining valve core assemblies includes a valve core and an elastic body, the valve core is slidingly installed in the valve body (1), the elastic body and the valve core are mutually sleeved, and the two ends of the elastic body in the extension and contraction direction abut against the valve core and the valve body (1) respectively; the two groups of pressure maintaining valve core assemblies are arranged in the two valve ports (11) respectively, the two valve cores are coaxially connected and slidingly sealed, and the compression directions of the two elastic bodies are opposite; Two cylinder deflation channels are arranged in the valve body (1), and the two cylinder deflation channels extend from the two valve ports (11) to the sliding sealing surfaces of the two valve cores respectively; The content in the cylinder body (01) flows from one of the valve ports (11) to compress the elastic body in the other valve port (11), so that the cylinder body (01) is deflated, and the elastic body rebounds to maintain the pressure of the cylinder body (01); The two valve cores include a valve core I (21) and a valve core II (22); the valve core I (21) is in a hollow sleeve shape, and the valve core II (22) is in a solid plunger shape; the adjacent ends of the valve core I (21) and the valve core II (22) both include umbrella-shaped caps, the umbrella-shaped caps of the valve core I (21) and the valve core II (22) are reversely distributed, and the valve body (1), the umbrella-shaped cap of the valve core I (21) and the umbrella-shaped cap of the valve core II (22) are sequentially and slidingly sealed from outside to inside; the other end of the valve core I (21) and the other end of the valve core II (22) are slidingly sealed in the valve body (1); One of the cylinder deflation channels extends from the valve core I (21) to the outer end surface of the umbrella-shaped cap of the valve core II (22), and extends from the outside of the valve core I (21) to the inner end surface of the umbrella-shaped cap of the valve core I (21); the other cylinder deflation channel extends from the outside of the valve core II (22) to the outer end surface of the umbrella-shaped cap of the valve core I (21) and the inner end surface of the umbrella-shaped cap of the valve core II (22); The valve body (1) is provided with a valve seat I (41) and a valve seat II (42); the valve seat I (41) and the valve seat II (42) are fixed in the two valve ports (11) respectively; the valve core I (21) is slidingly inserted into the valve seat I (41), and the valve core II (22) is slidingly inserted into the valve seat II (42); the two elastic bodies include an elastic body I (31) and an elastic body II (32), the elastic body I (31) sleeves the valve core I (21), the two ends of the elastic body I (31) abut against the inner end surface of the umbrella-shaped cap of the valve core I (21) and the valve seat I (41) respectively, the elastic body II (32) sleeves the valve core II (22), and the two ends of the elastic body II (32) abut against the inner end surface of the umbrella-shaped cap of the valve core II (22) and the valve seat II (42) respectively; The valve seat I (41) and the valve seat II (42) are each provided with a valve core mounting hole (410) and a gas leakage passage hole (420); a plurality of the gas leakage passage holes (420) are annularly arranged around the valve core mounting hole (410); The cross section of any one of the gas leakage passage holes (420) is in the shape of an arc-elliptical hole, and all the gas leakage passage holes (420) are distributed on the same circumference of the valve core; The valve body (1) and the contact surface of the valve core I (21), and the contact surface of the valve core I (21) and the valve core II (22) are each provided with a sealing ring (5); The two valve ports (11) are identical and are matched with the pressure maintaining valve interface of the neck of the gas cylinder body (01); The two groups of pressure maintaining valve core assemblies have the same pressure maintaining value.

2. A carbon dioxide cylinder characterized by The gas cylinder pressure maintaining valve is arranged on the neck of the gas cylinder body (01).

3. The carbon dioxide cylinder of claim 2, wherein, The gas cylinder hand valve (02) is further included; the gas cylinder hand valve (02) and the gas cylinder pressure maintaining valve are connected in parallel to the neck.

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