A residual pressure maintaining gas cylinder valve

Abstract

The present application discloses a residual pressure maintaining gas cylinder valve, comprising a first valve assembly, a second valve assembly and a housing, wherein the first valve assembly and the second valve assembly are mounted in the housing, an air flow channel is provided in the housing, the first valve assembly is adapted to move under the drive of the drive assembly and control the opening or closing of the air flow channel; the second valve assembly is switchably arranged at the end of the air flow channel by a spring, gas is adapted to enter the air flow channel and control the opening of the second valve assembly, the air flow channel comprises a stabilizing gas chamber and a first air flow opening, the stabilizing gas chamber is arranged at the end of the air flow channel, the stabilizing gas chamber is connected to the air flow channel through the first air flow opening, the stabilizing gas chamber is adapted to limit the flow rate of the gas, a guide sleeve is slidably provided in the second valve assembly, the first air flow opening and the guide sleeve are staggered in a horizontal plane. The purpose of the present application is to provide a residual pressure maintaining gas cylinder valve that is not prone to leakage under high-pressure working conditions and has good durability.

Description

Technical Field

[0001] The present application relates to the field of gas cylinder valves, and in particular to a residual pressure maintaining gas cylinder valve. Background Art

[0002] Currently, a gas cylinder valve, also known as a "bottle valve," refers to a valve installed on a gas cylinder to control the flow and flow of gas. Cylinders for different media generally use different valve structures. Their common characteristics include manual operation, simple structure, compact size, high strength, an operating temperature range of -40°C to 60°C, and materials that adapt to the physical and chemical properties of the medium, with copper being the most common. Residual pressure-maintaining gas cylinder valves feature an automatic closing function. When the gas pressure in the cylinder falls below a set value, the valve automatically closes to ensure that the output pressure remains above the set value.

[0003] However, the existing residual pressure maintaining gas cylinder valve is prone to leakage after long-term use, especially when the gas pressure in the cylinder is high, the leakage is more serious and the durability is very poor, which is a problem that technicians in this field need to solve. Summary of the Invention

[0004] One purpose of the present application is to provide a residual pressure maintaining gas cylinder valve that is not prone to leakage under high-pressure conditions and has good durability.

[0005] In order to achieve the above objectives, the technical solutions adopted in this application are:

[0006] A residual pressure maintaining gas cylinder valve comprises a first valve component, a second valve component and a shell, the first valve component and the second valve component are installed in the shell, an air flow channel is provided in the shell, the first valve component is suitable for moving under the drive of the drive component and controlling the opening or closing of the air flow channel; the second valve component is switchably arranged at the end of the air flow channel by a spring, gas is suitable for entering the air flow channel and controlling the opening of the second valve component, the air flow channel comprises a stabilizing gas cavity and a first air flow outlet, the stabilizing gas cavity is arranged at the end of the air flow channel, the stabilizing gas cavity is connected to the air flow channel through the first air flow outlet, the stabilizing gas cavity is suitable for limiting the flow rate of the gas, a guide sleeve is slidably provided in the second valve component, the gas is suitable for moving along the air flow channel and entering the stabilizing gas cavity through the first air flow outlet, and the gas is suitable for moving along the stabilizing gas cavity and driving the guide sleeve to slide, and causing the second valve component to open; the first air flow outlet and the guide sleeve are staggered in the horizontal plane.

[0007] A common residual pressure maintaining gas cylinder valve comprises a first valve assembly, a second valve assembly, a drive assembly, and a housing. The first valve assembly typically includes a valve stem and a valve assembly. The drive assembly includes a handle wheel, wherein the handle wheel is fixedly connected to the valve stem. The valve assembly is rotatably connected to the housing via external threads provided on its outer wall. When the handle wheel rotates and drives the valve stem to rotate, thereby driving the valve assembly to rotate, the valve assembly rotates along the threads and lifts axially, thereby opening the first valve assembly. The second valve assembly is switchably arranged at the end of the air flow channel by a spring. When gas in the gas cylinder enters along the air flow channel, due to the high air pressure in the cylinder, the air pressure generated by the air flow overcomes the spring force and pushes the second valve assembly to open, thereby allowing the gas in the cylinder to flow out of the cylinder along the air flow channel. When the air pressure in the cylinder gradually drops to a point where it cannot overcome the spring force, the air pressure generated by the air flow cannot overcome the spring force. Therefore, the second valve assembly is closed under the action of the spring force, the air flow channel is closed, and the gas in the cylinder cannot flow out, thereby achieving the automatic closing function and achieving the purpose of residual pressure maintenance. When the air pressure in the bottle is high (for example, when the working pressure is 40 MPa), the air flow velocity generated in the bottle under the action of the air pressure will also be fast, and the second valve assembly may be easily damaged under the impact of the air pressure.

[0008] The gas cylinder valve of the present application sets a stabilizing gas chamber at the end of the air flow channel and controls the flow rate of the gas through the stabilizing gas chamber. When the first valve assembly is opened, the gas in the gas cylinder enters the stabilizing gas chamber through the first air flow inlet and moves along the stabilizing gas chamber. As the gas is injected, the air pressure in the stabilizing gas chamber gradually increases until the thrust acting on the guide sleeve is greater than the elastic force of the spring. The guide sleeve can then be controlled to slide in the second valve assembly, thereby achieving the left and right movement of the guide sleeve and realizing the switch function. Setting up the stabilizing gas chamber can control the speed of gas flowing out of the cylinder valve, preventing the gas pressure in the gas cylinder from being too high, causing the gas flow rate to be too fast, thereby causing more turbulence when it leaves the cylinder valve, causing huge pressure loss, affecting subsequent use, and turbulence can also cause gases at different positions to interfere with each other, resulting in large energy loss. Although setting up the stabilizing gas chamber can also cause pressure loss, it is precisely because of the existence of the stabilizing gas chamber that it can reduce the flow rate of the gas, reduce the mutual interference of gases during turbulence, and reduce energy loss.

[0009] And keeping the first air flow opening and the guide sleeve staggered on the horizontal plane can effectively prevent the gas in the bottle from directly impacting the guide sleeve, causing damage to the guide sleeve, and even causing the sealing ring to detach in serious cases. The first air flow opening and the guide sleeve staggered on the horizontal plane means that the first air flow opening and the guide sleeve are projected on the horizontal plane, and the projected positions of the first air flow opening and the guide sleeve do not overlap, thereby ensuring that the gas entering the stabilizing gas cavity along the first air flow opening does not directly act on the guide sleeve, but flows along the stabilizing gas cavity, and through the action of the change in air pressure, the guide sleeve overcomes the spring force, thereby causing the guide sleeve to open. The first air flow opening and the guide sleeve staggered on the horizontal plane are suitable for controlling the impact force of the gas entering the stabilizing gas cavity along the first air flow opening on the guide sleeve, thereby avoiding damage to the guide sleeve. In addition, a sealing ring is generally provided on the guide sleeve to increase the sealing performance between the guide sleeve and the shell in the closed state. When controlling the impact force of the gas in the bottle on the guide sleeve, it can also avoid its impact on the sealing ring on the guide sleeve, preventing the sealing ring from being separated from the original installation position or changing the original shape under the action of the gas, causing a decrease in sealing ability.

[0010] If the first air flow opening and the guide sleeve are not staggered on the horizontal plane, that is, when the first air flow opening and the guide sleeve are projected on the horizontal plane, the projected positions of the first air flow opening and the guide sleeve coincide, gas will pass through the first air flow opening and directly act on the guide sleeve, causing the guide sleeve to be subjected to a large unidirectional impact force, thereby causing deformation of the guide sleeve or deformation of the sealing ring, thereby affecting the life of the overall residual pressure control gas cylinder valve.

[0011] Further preferably, the second valve assembly includes a screw sleeve, the head of the screw sleeve is detachably mounted in the shell, and the tail of the screw sleeve axially invades the air stabilizing chamber, wherein the screw sleeve is arranged on the outside of the guide sleeve, and an active chamber is axially opened in the screw sleeve, the guide sleeve is slidably mounted in the active chamber along the axial direction, the spring is arranged in the active chamber, one end of the spring is connected to the screw sleeve, and the other end of the spring is connected to the guide sleeve; a steady flow channel is defined between the inner wall of the air stabilizing chamber and the outer wall of the tail of the screw sleeve, the gas is suitable for passing through the first air flow opening and flowing forward along the steady flow channel, and finally driving the guide sleeve to slide into the active chamber, thereby opening the second valve assembly.

[0012] Further preferably, the first valve component is arranged along the Z-axis direction, the second valve component is arranged along the Y-axis direction, and the first valve component and the second valve component are staggered in the horizontal plane.

[0013] The staggered arrangement of the first valve assembly and the second valve assembly on the horizontal plane means that the projection positions of the first valve assembly and the second valve assembly on the horizontal plane (i.e., along the XOY plane) do not overlap, that is, the projection point of the axis of the first valve assembly on the horizontal plane does not fall on the projection line of the second valve assembly on the horizontal plane, thereby further preventing the gas in the gas cylinder from directly passing through the first gas flow opening and directly acting on the second valve assembly. Since the second valve assembly is detachably mounted on the shell through a screw sleeve, the airflow generated from the bottom will cause the screw sleeve to always have an upward airflow impact force, thereby causing the screw sleeve to deform upward, thereby causing the residual pressure to maintain the gas cylinder valve to leak, affecting its service life.

[0014] Further preferably, the head of the screw sleeve is detachably mounted in the shell along the Y-axis, and the tail of the screw sleeve invades the stabilizing air cavity along the Y-axis, and the inner wall of the stabilizing air cavity is parallel to the outer wall of the screw sleeve; the first air flow opening is arranged along the X-axis and controls the gas entering the stabilizing air cavity.

[0015] Another preferred embodiment is that an annular flow stabilizing groove is provided radially outward on the inner wall of the gas stabilizing cavity, and the first air flow opening is provided on the groove wall of the annular flow stabilizing groove. The gas is suitable for entering the annular flow stabilizing groove through the first air flow opening, and flowing along the groove wall of the annular flow stabilizing groove, and finally entering the flow stabilizing channel. The annular flow stabilizing groove is suitable for controlling the flow velocity and impact force of the gas entering the flow stabilizing channel. The diameter of the groove wall of the annular flow stabilizing groove is D1, and the inner diameter of the inner wall of the gas stabilizing cavity is D2, satisfying D1>D2.

[0016] Further preferably, the air flow channel includes a coaxially arranged second air flow opening and a diffusion chamber, the stabilizing air chamber is arranged at the upper part of the diffusion chamber, and the diffusion chamber is connected to the stabilizing air chamber through the first air flow opening. The gas is suitable for entering the diffusion chamber through the second air flow opening, moving upward along the diffusion chamber, and entering the stabilizing air chamber through the first air flow hole. The maximum height of the first valve assembly in the open state is H1, and the height of the first air flow opening is H2, satisfying H2>H1.

[0017] It is further preferred that a limiting flow groove is axially arranged at the bottom of the first valve component, and a mounting protrusion is protruded upward on the inner wall of the bottom of the diffusion chamber, and the second air flow opening is penetrated by the mounting protrusion. When the first valve component moves downward, the bottom of the limiting flow groove abuts against the top of the mounting protrusion and closes the second air flow opening; when the first valve component moves upward, the bottom of the limiting flow groove is separated from the top of the mounting protrusion and the second air flow opening is opened, and the gas is suitable for passing through the second air flow opening and entering the limiting flow groove, and the limiting flow groove is suitable for controlling the speed of the gas.

[0018] Further preferably, the air flow channel includes an acceleration channel, which connects the first air flow opening and the stabilizing air chamber, and the gas is suitable for moving upward in the diffusion chamber and entering the acceleration channel through the first air flow opening, thereby entering the stabilizing air chamber; the inner wall of the middle part of the acceleration channel protrudes radially inward to provide a limiting flow portion, and the inner wall of the limiting portion defines a limiting hole, and the gas is suitable for passing through the limiting hole and entering the stabilizing air chamber.

[0019] Further preferably, the inner diameters of both ends of the acceleration channel are D4, and the inner diameter of the flow limiting hole is D3, satisfying D4>D3.

[0020] Further preferably, a baffle ring is axially arranged in the air stabilizing cavity, and the baffle ring is sleeved on the outside of the screw sleeve. The outer diameter of the baffle ring is smaller than the inner diameter of the inner wall of the air stabilizing cavity, and the inner diameter of the baffle ring is larger than the outer diameter of the tail of the screw sleeve.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) By providing a stabilizing gas cavity, the gas passing through the first gas flow opening can first enter the stabilizing gas cavity and move along the stabilizing gas cavity. The gas pressure in the stabilizing gas cavity increases, thereby pushing the guide sleeve assembly to open, so that the gas flowing through the stabilizing gas cavity can flow out of the gas cylinder valve, thereby stabilizing the gas flow rate and preventing the gas from flowing out too fast due to excessive pressure in the gas cylinder, causing turbulence and excessive pressure loss, which affects subsequent use;

[0023] (2) By staggering the first gas flow opening and the guide sleeve in the horizontal plane, the force exerted by the gas passing through the first gas flow opening on the guide sleeve can be controlled, thereby preventing the guide sleeve from being deformed under the long-term action of a unidirectional force, and even causing the seal to be dislocated and deformed, thereby affecting the service life of the bottle valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a cross-sectional view of a conventional gas cylinder valve, showing the positions of the first gas flow port and the guide sleeve;

[0025] Figure 2 A front view of an embodiment of a gas cylinder valve of the present application, showing a housing and a drive assembly;

[0026] Figure 3 A cross-sectional view of section AA of an embodiment of a gas cylinder valve of the present application is shown, illustrating the position and structure of various components;

[0027] Figure 4 This is a partial enlarged view of position C of an embodiment of the gas cylinder valve of the present application, showing the direction of gas flow;

[0028] Figure 5 A cross-sectional view of an embodiment of the gas cylinder valve of the present application from another direction, showing that the second valve assembly and the first valve assembly are staggered in the horizontal plane;

[0029] Figure 6 This is a partial enlarged view of the D position of an embodiment of the gas cylinder valve of the present application, showing the annular flow stabilizing groove;

[0030] Figure 7 A BB cross-sectional view of a housing of an embodiment of a gas cylinder valve of the present application is shown, showing a state where the second valve assembly is not installed;

[0031] Figure 8 A cross-sectional view of a housing of an embodiment of a gas cylinder valve of the present application, showing a state after the second valve assembly is installed;

[0032] Figure 9a A cross-sectional view of an embodiment of a gas cylinder valve of the present application, showing a gas stabilizing cavity and a diffusion cavity;

[0033] Figure 9b A partial cross-sectional view of an embodiment of a gas cylinder valve of the present application, showing the maximum moving height H1 of the valve assembly and the height H2 of the first gas flow opening 32;

[0034] Figure 10 This is a partial enlarged view of position E of an embodiment of the gas cylinder valve of the present application, showing the flow restriction groove;

[0035] Figure 11 This is a cross-sectional view at position AA of an embodiment of a gas cylinder valve of the present application, showing an acceleration channel;

[0036] Figure 12 A cross-sectional view of a cylinder valve according to an embodiment of the present application at position BB shows a flow restriction portion and a flow restriction hole;

[0037] Figure 13 This is a partial enlarged view of position F of an embodiment of the gas cylinder valve of the present application, showing the screw sleeve and the baffle ring;

[0038] Figure 14 A schematic diagram of a casting wax mold for a gas cylinder valve of the present application, showing a first wax mold, a second wax mold, and a third wax mold;

[0039] Figure 15 This is a schematic diagram of a casting wax mold for a gas cylinder valve of the present application, showing a left wax mold and a right wax mold.

[0040] In the figure: 1. first valve assembly; 11. valve stem; 12. flow limiting groove; 13. valve assembly; 2. second valve assembly; 21. guide sleeve; 22. screw sleeve; 221. movable chamber; 23. spring; 3. air flow channel; 31. air stabilizing chamber; 311. flow stabilizing channel; 312. annular flow stabilizing groove; 313. baffle ring; 32. first air flow opening; 33. second air flow opening; 34. diffusion chamber; 35. acceleration channel; 351. flow limiting part; 352. flow limiting hole; 36. air inlet; 37. air outlet; 4. mounting protrusion; 5. housing; 100. drive assembly; 101. handle wheel; 200. wax mold; 201. first wax mold; 202. second wax mold; 203. third wax mold; 2031. left wax mold; 2032. right wax mold. DETAILED DESCRIPTION

[0041] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0042] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0043] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0044] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0045] A common residual pressure maintaining gas cylinder valve comprises a first valve assembly 1, a second valve assembly 2, a drive assembly 100 and a housing 5. Generally, the first valve assembly 1 comprises a valve stem 11 and a valve assembly 13. The drive assembly 100 comprises a handle wheel 101, wherein the handle wheel 101 is fixedly connected to the valve stem 11, and the valve assembly 13 is rotatably connected to the housing 5 through an external thread provided on its outer wall. When the handle wheel 101 rotates and drives the valve stem 11 to rotate, thereby driving the valve assembly 13 to rotate, (in this specific embodiment, the valve stem 11 and the valve assembly 13 are slidably connected, and a protrusion is provided on the valve stem 11, and a corresponding groove is provided on the inner wall of the valve assembly 13. Therefore, when the handle wheel 101 rotates, the torque on the valve stem 11 can be transmitted to the valve assembly 13, thereby driving the valve assembly 13 to rotate, and since the valve stem 11 and the valve assembly 13 are slidably connected, When the valve assembly 13 spirally rises, the absolute height of the valve stem 11 remains unchanged, and the absolute height of the handle wheel 101 does not change either. The valve assembly 13 rotates along the thread and rises axially, thereby opening the first valve assembly 1. The second valve assembly 2 is switchably arranged at the end of the air flow channel 3 by a spring 23. When the gas in the gas cylinder enters along the air flow channel 3, due to the high air pressure in the cylinder, the air pressure generated by this air flow overcomes the elastic force of the spring 23 and pushes the second valve assembly 2 to open, thereby allowing the gas in the cylinder to flow out of the cylinder along the air flow channel 3. When the air pressure in the cylinder gradually drops to a point where it cannot overcome the elastic force of the spring 23, the air pressure generated by the air flow cannot overcome the elastic force of the spring 23. Therefore, the second valve assembly 2 is in a closed state under the action of the elastic force of the spring 23, and the air flow channel 3 is closed, preventing the gas in the cylinder from flowing out, thereby achieving the automatic closing function and the purpose of maintaining residual pressure. In this specific embodiment, an air inlet 36 is provided at the bottom of the air flow channel 3, and an air outlet 37 is provided at the end of the air flow channel 3.

[0046] However, in actual use, especially when the air pressure in the bottle is high (for example, when its working pressure is 40 MPa), the air flow speed generated in the bottle under the action of the air pressure will also be fast, and the impact of the air pressure will easily cause damage to the second valve assembly 2, thereby causing air leakage in the bottle valve and affecting the service life of the entire bottle valve.

[0047] Therefore, the inventors of this application have developed a residual pressure maintaining gas cylinder valve, which can be implemented as follows: Figures 2 to 15As shown, it includes a first valve component 1, a second valve component 2 and a shell 5. The first valve component 1 and the second valve component 2 are installed in the shell 5. An air flow channel 3 is provided in the shell 5. The first valve component 1 is suitable for moving under the drive of the drive component 100 and controlling the opening or closing of the air flow channel 3; the second valve component 2 is switchably arranged at the end of the air flow channel 3 through a spring 23, and the gas is suitable for entering the air flow channel 3 and controlling the opening of the second valve component 2. The air flow channel 3 includes a stabilizing gas chamber 31 and a first air flow port 32. The stabilizing gas chamber 31 is arranged at the end of the air flow channel 3. The stabilizing gas chamber 31 is connected to the air flow channel 3 through the first air flow port 32. The stabilizing gas chamber 31 is suitable for limiting the flow rate of the gas. A guide sleeve 21 is slidably provided in the second valve component 2. The gas is suitable for moving along the air flow channel 3 and entering the stabilizing gas chamber 31 through the first air flow port 32. The gas is suitable for moving along the stabilizing gas chamber 31 and driving the guide sleeve 21 to slide, thereby opening the second valve component 2; the first air flow port 32 and the guide sleeve 21 are staggered in the horizontal plane. In this specific embodiment, an air inlet 36 is provided at the bottom of the air flow channel 3, and an air outlet 37 is provided at the end of the air stabilizing cavity 31. The gas in the bottle is suitable for entering the air flow channel 3 through the air inlet 36 and leaving the bottle valve along the air outlet 37.

[0048] The gas cylinder valve of this application, such as Figure 7 and Figure 8 As shown, by setting a stabilizing chamber 31 at the end of the air flow channel 3 and controlling the flow rate of the gas through the stabilizing chamber 31, when the first valve assembly 1 is opened, the gas in the gas cylinder enters the stabilizing chamber 31 through the first air flow inlet 32 and moves along the stabilizing chamber 31. As the gas is injected, the air pressure in the stabilizing chamber 31 will gradually increase until the thrust acting on the guide sleeve 21 is greater than the elastic force of the spring 23. The sliding of the guide sleeve 21 in the second valve assembly 2 can be controlled to achieve the leftward sliding of the guide sleeve 21, thereby achieving the opening of the second valve assembly 2; when the air pressure in the bottle gradually decreases, the force of the air pressure in the stabilizing chamber 31 acting on the guide sleeve 21 is not enough to overcome the elastic force of the spring 23, and the guide sleeve 21 slides to the right under the action of the spring 23, thereby closing the second valve assembly 2 to achieve the effect of maintaining the residual pressure. The provision of the stabilizing chamber 31 can control the speed at which the gas flows out of the cylinder valve, preventing excessive pressure within the cylinder from causing the gas to flow too quickly, thereby causing more turbulence when it leaves the cylinder valve, resulting in significant pressure loss and affecting subsequent use. Furthermore, turbulence can cause gases at different locations to interfere with each other, resulting in significant energy loss. Although the provision of the stabilizing chamber 31 can also cause pressure loss, it is precisely because of the presence of the stabilizing chamber 31 that it reduces the flow rate of the gas, making the outflowing gas flow rate lower, less interfering with each other, and more convenient for subsequent use.

[0049] Furthermore, the first gas flow opening 32 and the guide sleeve 21 are staggered in the horizontal plane, which can effectively prevent the gas in the bottle from directly impacting the guide sleeve 21, causing damage to the guide sleeve 21, and even causing the sealing ring to detach. The staggered arrangement of the first gas flow opening 32 and the guide sleeve 21 in the horizontal plane refers to projecting the first gas flow opening 32 and the guide sleeve 21 on the horizontal plane (i.e., the XOY plane) (e.g., Figure 8 As shown), the projection positions of the first air flow opening 32 and the guide sleeve 21 do not overlap (in this specific embodiment, as shown Figure 8 As shown, that is, the Y-axis coordinate of the first air flow opening 32 projected on the XOY plane is different from the Y-axis coordinate of the guide sleeve 21 projected on the XOY plane), that is, it is ensured that the gas entering the stabilizing chamber 31 along the first air flow opening 32 will not directly act on the guide sleeve 21, but will flow along the stabilizing chamber 31, and under the action of the change in air pressure, the guide sleeve 21 will overcome the elastic force of the spring 23, thereby opening the guide sleeve 21. The first air flow opening 32 and the guide sleeve 21 are staggered in the horizontal plane, which is suitable for controlling the impact force of the gas entering the stabilizing chamber 31 along the first air flow opening 32 on the guide sleeve 21, thereby avoiding damage to the guide sleeve 21. In addition, a sealing ring is generally provided on the guide sleeve 21 to increase the sealing performance between the guide sleeve 21 and the shell 5 in the closed state. When controlling the impact force of the gas in the bottle on the guide sleeve 21, it can also avoid its impact on the sealing ring on the guide sleeve 21, preventing the sealing ring from being separated from the original installation position or changing the original shape variable under the action of the gas, resulting in a decrease in sealing ability.

[0050] like Figure 1 As shown, if the first air flow opening 32 and the guide sleeve 21 are not offset in the horizontal plane, that is, when the first air flow opening 32 and the guide sleeve 21 are projected on the horizontal plane (i.e., the XOY plane), the projected positions of the first air flow opening 32 and the guide sleeve 21 coincide (i.e., the Y coordinate of the first air flow opening 32 projected on the XOY plane coincides with the Y coordinate of the guide sleeve 21 projected on the XOY plane), that is, the gas passes through the first air flow opening 32 and directly acts on the guide sleeve 21, causing the guide sleeve 21 to be subjected to a large unidirectional impact force, thereby causing the guide sleeve 21 to deform or the sealing ring to deform, thereby affecting the life of the entire residual pressure control gas cylinder valve. It is worth mentioning that the unidirectional impact force on the guide sleeve 21 is caused by the gas acting on the guide sleeve 21 from bottom to top along the air flow channel 3. Due to the position of the first air flow opening 32, long-term exposure to the unidirectional impact force will cause the guide sleeve 21 to deform, and cause the sealing ring to shift and deform, etc., affecting the service life of the cylinder valve.

[0051] More preferably, Figure 3 、 Figure 7 combine Figure 8As shown, the second valve assembly 2 includes a screw sleeve 22, the head of the screw sleeve 22 is detachably mounted in the housing 5, and the tail of the screw sleeve 22 axially invades the stable air chamber 31, wherein the screw sleeve 22 is sleeved on the outside of the guide sleeve 21, and an active chamber 221 is axially opened in the screw sleeve 22, the guide sleeve 21 is slidably mounted in the active chamber 221 along the axial direction, and the spring 23 is arranged in the active chamber 221, one end of the spring 23 is connected to the screw sleeve 22, and the other end of the spring 23 is connected to the guide sleeve 21; a stable flow channel 311 is defined between the inner wall of the stable air chamber 31 and the outer wall of the tail of the screw sleeve 22, and the gas is suitable for passing through the first air flow opening 32 and flowing forward along the stable flow channel 311, and finally driving the guide sleeve 21 to slide into the active chamber 221, thereby opening the second valve assembly 2.

[0052] The stabilizing flow channel 311 is set between the inner wall of the stabilizing air chamber 31 and the outer wall of the tail end of the screw sleeve 22 to facilitate the gas entering the stabilizing air chamber 31 to move to the right along the stabilizing flow channel 311. If the stabilizing flow channel 311 is not set, even if the inner wall of the stabilizing air chamber 31 contacts the outer wall of the tail end of the screw sleeve 22, although a sealing ring is generally required to seal the gas, the simple contact cannot limit the movement of the gas along the stabilizing air chamber 31, but it will cause a large pressure difference at the left and right ends of the stabilizing air chamber 31, and the gas flow rate will drop too much, which will affect the operation of subsequent processes. Therefore, the stabilizing flow channel 311 is set to allow more gas to flow out of the gas cylinder valve along the stabilizing flow channel 311.

[0053] More preferably, Figure 3 and Figure 8 As shown, the first valve assembly 1 is arranged along the Z-axis direction, the second valve assembly 2 is arranged along the Y-axis direction, and the first valve assembly 1 and the second valve assembly 2 are staggered on the horizontal plane.

[0054] The staggered arrangement of the first valve assembly 1 and the second valve assembly 2 on the horizontal plane means that the projection positions of the first valve assembly 1 and the second valve assembly 2 on the horizontal plane (i.e., along the XOY plane) do not overlap, that is, the projection point of the axis of the first valve assembly 1 on the horizontal plane does not fall on the projection line of the axis of the second valve assembly 2 on the horizontal plane (since the first valve assembly 1 is arranged along the Z-axis direction and the second valve assembly 2 is arranged along the Y-axis direction, the projection of the axis of the first valve assembly 1 on the XOY plane is point-shaped, and the projection of the axis of the second valve assembly 2 on the XOY plane is linear), thereby further preventing the gas in the gas cylinder from directly passing through the first gas flow opening 32 and directly acting on the second valve assembly 2. Since the second valve assembly 2 is detachably mounted on the housing 5 through the screw sleeve 22, the airflow generated from the bottom will cause the screw sleeve 22 to always have an upward airflow impact force, thereby causing the screw sleeve 22 to deform upward, thereby causing the residual pressure to maintain the gas cylinder valve to leak, affecting its service life. It is worth mentioning that, according to Bernoulli's equation, if the screw sleeve 22 is not fixed on the shell 5, the airflow generated from the bottom will cause the airflow velocity at the bottom of the screw sleeve 22 to be large, and the airflow velocity at the top of the screw sleeve 22 to be small, which will cause the screw sleeve 22 to suspend, thereby reducing the deformation of the screw sleeve 22. However, in actual use, the screw sleeve 22 must be detachably mounted on the shell 5 to avoid air leakage of the screw sleeve 22. Therefore, the head of the screw sleeve 22 is connected to the shell 5, and the pressure difference generated by the different gas flow rates at the tail of the screw sleeve 22 will further aggravate the deformation of the screw sleeve 22. Although the gas directly impacts the screw sleeve 22, the deformation of the screw sleeve 22 will be further aggravated. 2 will cause the screw sleeve 22 to deform upward; the gas flow rate at the top is slow and the air pressure is high, while the gas flow rate at the bottom is fast and the air pressure is low, the screw sleeve 22 will deform downward, but the above two deformations will not offset each other. The reason is that the deformation caused by the direct impact of the air flow is at the contact point between the screw sleeve 22 and the first air flow opening 32; and the deformation caused by the pressure difference is distributed at various positions of the tail of the screw sleeve 22 in the stabilizing air cavity 31. Therefore, it will increase the deformation degree of the screw sleeve 22, thereby affecting the contact position between the screw sleeve 22 and the guide sleeve 21, causing the guide sleeve 21 to be unable to move axially, resulting in a decrease in the sealing degree and other problems.

[0055] More preferably, Figure 8 As shown, the head of the screw sleeve 22 is detachably mounted in the shell 5 along the Y-axis, and the tail of the screw sleeve 22 invades the stabilizing air cavity 31 along the Y-axis, and the inner wall of the stabilizing air cavity 31 is parallel to the outer wall of the screw sleeve 22; the first air flow opening 32 is arranged along the X-axis and controls the gas entering the stabilizing air cavity 31.

[0056] The first gas flow opening 32 is arranged along the X-axis to control the flow direction of the gas entering the gas stabilizing chamber 31, so that the flow direction of the gas can be parallel to the X-axis, which facilitates the subsequent control of the gas flow direction, speed and pressure difference, and prolongs the service life of the gas cylinder valve. Figure 1 In the embodiment, the direction of the first air flow opening 32 is at a certain angle to the X-axis, and the gas flowing out of the first air flow opening 32 is parallel to the direction of the first air flow opening 32, and therefore also at a certain angle to the X-axis. Therefore, the gas acting on the screw sleeve 22 will generate more forces of different sizes and directions, which is not convenient for the subsequent sorting of the forces generated by the airflow, making these forces difficult to control and causing damage to the screw sleeve 22, thereby affecting the service life of the gas cylinder valve.

[0057] Another preferred option is Figure 6 and Figure 7 As shown, an annular flow stabilizing groove 312 is provided radially outward on the inner wall of the gas stabilizing cavity 31, and a first air flow opening 32 is provided on the groove wall of the annular flow stabilizing groove 312. The gas is suitable for entering the annular flow stabilizing groove 312 through the first air flow opening 32, and flowing along the groove wall of the annular flow stabilizing groove 312, and finally entering the flow stabilizing channel 311. The annular flow stabilizing groove 312 is suitable for controlling the flow rate and impact force of the gas entering the flow stabilizing channel 311. The diameter of the groove wall of the annular flow stabilizing groove 312 is D1, and the inner diameter of the inner wall of the gas stabilizing cavity 31 is D2, satisfying D1>D2.

[0058] By controlling the diameter D1 of the annular stabilizing flow groove 312 so that it is larger than the inner diameter D2 of the inner wall of the gas stabilizing chamber 31, the speed of the gas entering the gas stabilizing chamber 31 is reduced, and the problem of energy drop caused by the mutual interference between the turbulence caused by the excessive speed is reduced, and the gas entering the gas stabilizing chamber 31 can be diverted, and can enter the gas stabilizing chamber 31 along the upper wall of the annular stabilizing flow groove 312, or can enter the gas stabilizing chamber 31 along the lower wall of the annular stabilizing flow groove 312, and the annular stabilizing flow groove 312 can play the role of accommodating gas, so that the flow direction of the gas flowing out of the bottle valve is as similar as possible, reducing the occurrence of mutual interference. It is worth mentioning that the depth of the groove along the circumferential direction of the annular stabilizing flow groove 312 can be controlled to control the effect of the pressure difference caused by the different gas flow rates on the screw sleeve 22, thereby reducing the occurrence of deformation.

[0059] However, in actual use, simply preventing the airflow from directly acting on the guide sleeve 21 still cannot solve the problems of the short lifespan and easy wear of the existing residual pressure maintenance gas cylinder valve. After further research, the inventors found that the main reasons for the short lifespan and easy wear of the existing residual pressure maintenance gas cylinder valve are: the airflow directly acting on the guide sleeve 21 causes the guide sleeve 21 to deform; the airflow directly acting on the screw sleeve 22 causes the screw sleeve 22 to deform; or the pressure difference caused by the different gas flow rates at various positions in the stabilizing gas chamber 31 causes the screw sleeve 22 to deform. These deformations will amplify the sealing performance of the connection between the second valve assembly 2 and the housing 5 during long-term use, resulting in a decrease in sealing ability, thereby causing the residual pressure maintenance gas cylinder valve to have a short lifespan and easy wear.

[0060] Based on this, the inventors have developed further preferred embodiments, such as Figure 9a 、 Figure 9b and Figure 10 As shown, the air flow channel 3 includes a coaxially arranged second air flow opening 33 and a diffusion chamber 34, the stabilizing air chamber 31 is arranged at the upper part of the diffusion chamber 34, and the diffusion chamber 34 is connected to the stabilizing air chamber 31 through the first air flow opening 32. The gas is suitable for entering the diffusion chamber 34 through the second air flow opening 33, moving upward along the diffusion chamber 34, and entering the stabilizing air chamber 31 through the first air flow opening 32. The maximum height of the first valve assembly 1 in the open state is H1, and the height of the first air flow opening 32 is H2, satisfying H2>H1.

[0061] The first valve assembly 1 is controlled to move upward by the handle wheel 101, so that the first valve assembly 1 is in the open state. The gas in the gas cylinder can enter the air flow channel 3 through the air inlet 36, and enter the diffusion chamber 34 through the second air flow opening 33, and move upward along the diffusion chamber 34 and enter the stabilizing chamber 31 through the first air flow opening 32. Figure 9a As shown, the first valve assembly 1 is in a closed state; Figure 9b As shown, when the first valve assembly 1 is in the open state, its maximum moving height is H1, and the height of the first air flow opening 32 is H2, satisfying H2>H1, which can ensure that the gas flowing out of the second air flow opening 33 will not directly enter the first air flow opening 32, but will move upward along the diffusion chamber 34 and eventually enter the first air flow opening 32.

[0062] When the maximum height H1 of the first valve assembly 1 is opened ≥ the height H2 of the first air flow opening 32, as shown in FIG. Figure 3 As shown, the gas passing through the second gas flow opening 33 will impact the bottom of the first valve assembly 1 under the action of its gas pressure, and change its flow direction and directly enter the first gas flow opening 32 (as shown in FIG. Figure 4The dotted line shown is the direction of gas flow. In this case, the gas flow in the Z-axis direction is uneven, with more gas flowing in the lower part and less in the upper part. This causes different airflow velocities at different positions, thereby causing different air pressures at the upper and lower positions of the screw sleeve 22 along the Z-axis, resulting in wear of the screw sleeve 22. In more serious cases, since the distribution of gas will change with the position of the valve assembly 13 on the first valve assembly 1, its wear will also vary irregularly due to different usage conditions, further reducing the service life of the entire bottle valve.

[0063] Therefore, by controlling H2>H1, the gas flowing out of the gas cylinder at a higher speed cannot directly enter the first gas flow opening 32, but is diffused through the diffusion chamber 34, so that the gas entering the first gas flow opening 32 is more evenly distributed, thereby avoiding the pressure difference between the upper and lower surfaces of the screw sleeve 22 and causing deformation of the screw sleeve 22.

[0064] More preferably, Figure 10 As shown, a limiting flow groove 12 is axially arranged around the bottom of the first valve component 1, and a mounting protrusion 4 is protruded upward on the inner wall of the bottom of the diffusion chamber 34. A second air flow opening 33 is provided through the mounting protrusion 4. When the first valve component 1 moves downward, the bottom of the limiting flow groove 12 contacts the top of the mounting protrusion 4 and closes the second air flow opening 33; when the first valve component 1 moves upward, the bottom of the limiting flow groove 12 separates from the top of the mounting protrusion 4 and opens the second air flow opening 33. The gas is suitable for passing through the second air flow opening 33 and entering the limiting flow groove 12. The limiting flow groove 12 is suitable for controlling the speed of the gas.

[0065] The flow limiting groove 12 can further change the flow direction of the gas entering the diffusion chamber 34, such as Figure 10 The dotted line shows the flow direction of the gas entering the diffusion chamber 34 through the second air flow opening 33 under the action of the flow limiting groove 12. The gas is affected by the groove wall of the diffusion chamber 34, so that the flow rate of the gas entering the diffusion chamber 34 is further reduced, so that the gas flowing into the first air flow opening 32 set at the top of the diffusion chamber 34 is more uniform along the Z-axis direction, so that the gas flow rate entering the stabilizing chamber 31 on the upper and lower sides along the Z-axis is as similar as possible, reducing the pressure difference caused by the different air flow speeds.

[0066] More preferably, Figure 11 and Figure 12As shown, the air flow channel 3 includes an acceleration channel 35, which connects the first air flow inlet 32 and the stabilizing air chamber 31. The gas is suitable for moving upward in the diffusion chamber 34 and entering the acceleration channel 35 through the first air flow inlet 32, thereby entering the stabilizing air chamber 31; the inner wall of the middle part of the acceleration channel 35 protrudes radially inward to provide a limiting portion 351, and the inner wall of the limiting portion 351 defines a limiting hole 352, and the gas is suitable for passing through the limiting hole 352 and entering the stabilizing air chamber 31.

[0067] The flow-limiting hole 352 is set to act by two points, one of which can increase the flow velocity of the gas entering the steady gas chamber 31 in advance, so that the gas flow rate of the gas flowing out of the bottle valve is not too low; the second is to play the effect of gas gathering, prevent the uneven distribution of gas on the Z axis due to the different heights on the Z axis, thereby causing unnecessary wear. It is worth mentioning that, affected by the influence of gas forward flow along the X axis, the screw sleeve 22 may also have the air pressure difference caused by the different air flow speeds along the front and back directions of the X axis, at this time, the groove depth of the annular steady flow groove 312 close to the first air flow opening 32 can be increased (i.e., close to O point), and the groove depth of the annular steady flow groove 312 away from the first air flow opening 32 can be reduced (i.e., away from O point), thereby the air flow velocity close to the first air flow opening 32 side is reduced, and the air flow velocity away from the first air flow opening 32 side is improved, thereby reducing the influence of the air pressure difference on the screw sleeve 22 caused by the different gas flow speeds.

[0068] More preferably, Figure 11 As shown, the inner diameters of both ends of the acceleration channel 35 are D4, and the inner diameter of the flow limiting hole 352 is D3, satisfying D4>D3.

[0069] When the gas pressure in the bottle is different, the speed of the airflow accelerated through the acceleration channel 35 may exceed the speed of sound. Therefore, the inner diameter D4 at both ends of the acceleration channel 35 is set to be greater than the inner diameter D3 of the flow limiting hole 352, so as to form a convergent-divergent nozzle, thereby achieving the effect of continuous acceleration in the acceleration channel 35.

[0070] More preferably, Figure 13 As shown, a baffle ring 313 is axially disposed within the stabilizing air chamber 31. The baffle ring 313 is sleeved onto the exterior of the screw sleeve 22. The outer diameter of the baffle ring 313 is smaller than the inner diameter of the inner wall of the stabilizing air chamber 31, and the inner diameter of the baffle ring 313 is larger than the outer diameter of the rear end of the screw sleeve 22. In this specific embodiment, the outer diameter of the baffle ring 313 is D5, the inner diameter of the baffle ring 313 is D6, the inner diameter of the inner wall of the stabilizing air chamber 31 is D2, and the outer diameter of the rear end of the screw sleeve 22 is D7, satisfying the relationship D2>D5>D6>D7.

[0071] Meeting the above dimensional relationship can not only ensure that the airflow enters the annular stabilizing groove 312 through the acceleration channel 35, but also ensure that the gas in the annular stabilizing groove 312 can smoothly enter the stabilizing channel 311, and the baffle ring 313 can reduce the impact of the airflow on the screw sleeve 22 in the X-axis direction, thereby reducing the deformation of the screw sleeve 22.

[0072] To process and shape the gas cylinder valve, a combination of precision casting and machining is used, such as Figure 14 and Figure 15 As shown, the wax mold 200 is divided into a first wax mold 201, a second wax mold 202 and a third wax mold 203. The first wax mold 201, the second wax mold 202 and the third wax mold 203 are connected together by wax mold splicing. In order to process the baffle ring 313, the third wax mold 203 can be divided into a left wax mold 2031 and a right wax mold 2032 (of course, in order to facilitate the processing of the right wax mold 2032, it can also be further split and subsequently connected together by wax mold splicing). The left wax mold 2031 and the right wax mold 2032 can also be connected together by wax mold splicing, and then the baffle ring 313 and the acceleration channel 35 are processed by the wax mold disappearing molding method of precision casting. Other cavities with different diameters can be produced by machining.

[0073] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A residual pressure maintaining gas cylinder valve, comprising a first valve assembly, a second valve assembly, and a housing, wherein the first and second valve assemblies are mounted within the housing, an air flow channel being provided within the housing, the first valve assembly being adapted to move under the drive of a drive assembly and to control the opening or closing of the air flow channel; the second valve assembly being switchably disposed at the end of the air flow channel via a spring, gas being adapted to enter the air flow channel and control the opening of the second valve assembly, characterized in that: The air flow channel includes a stabilizing air cavity and a first air flow opening, the stabilizing air cavity is arranged at the end of the air flow channel, the stabilizing air cavity is connected to the air flow channel through the first air flow opening, the stabilizing air cavity is suitable for limiting the flow rate of the gas, a guide sleeve is slidably provided in the second valve assembly, the gas is suitable for moving along the air flow channel and entering the stabilizing air cavity through the first air flow opening, and the gas is suitable for moving along the stabilizing air cavity and driving the guide sleeve to slide, thereby opening the second valve assembly; the first air flow opening and the guide sleeve are staggered in a horizontal plane; The second valve assembly includes a screw sleeve, the head of the screw sleeve is detachably mounted in the housing, and the tail of the screw sleeve axially invades the gas stabilizing chamber, wherein the screw sleeve is sleeved on the outside of the guide sleeve, and an active chamber is axially opened in the screw sleeve, the guide sleeve is slidably mounted in the active chamber along the axial direction, the spring is arranged in the active chamber, one end of the spring is connected to the screw sleeve, and the other end of the spring is connected to the guide sleeve; a stabilizing flow channel is defined between the inner wall of the gas stabilizing chamber and the outer wall of the tail of the screw sleeve, the gas is suitable for passing through the first gas flow opening and flowing forward along the stabilizing flow channel, and finally driving the guide sleeve to slide into the active chamber, thereby opening the second valve assembly; The inner wall of the gas stabilizing cavity is provided with an annular flow stabilizing groove radially outward, and the first air flow opening is provided on the groove wall of the annular flow stabilizing groove. The gas is suitable for entering the annular flow stabilizing groove through the first air flow opening, and flowing along the groove wall of the annular flow stabilizing groove, and finally entering the flow stabilizing channel. The annular flow stabilizing groove is suitable for controlling the flow velocity and impact force of the gas entering the flow stabilizing channel. The diameter of the groove wall of the annular flow stabilizing groove is D1, and the inner diameter of the inner wall of the gas stabilizing cavity is D2, satisfying D1>D2.

2. A residual pressure maintaining gas cylinder valve according to claim 1, characterized in that: The first valve component is arranged along the Z-axis direction, the second valve component is arranged along the Y-axis direction, and the first valve component and the second valve component are staggered on the horizontal plane.

3. A residual pressure maintaining gas cylinder valve according to claim 2, characterized in that: The head of the screw sleeve is detachably mounted in the shell along the Y-axis, and the tail of the screw sleeve invades the stabilizing air cavity along the Y-axis, and the inner wall of the stabilizing air cavity is parallel to the outer wall of the screw sleeve; the first air flow opening is arranged along the X-axis and controls the gas entering the stabilizing air cavity.

4. A residual pressure maintaining gas cylinder valve according to claim 3, characterized in that: The air flow channel includes a coaxially arranged second air flow opening and a diffusion chamber, the stabilizing air chamber is arranged at the upper part of the diffusion chamber, and the diffusion chamber is connected to the stabilizing air chamber through the first air flow opening. The gas is suitable for entering the diffusion chamber through the second air flow opening, moving upward along the diffusion chamber, and entering the stabilizing air chamber through the first air flow hole. The maximum height of the first valve assembly in the open state is H1, and the height of the first air flow opening is H2, satisfying H2>H1.

5. A residual pressure maintaining gas cylinder valve according to claim 4, characterized in that: A limiting flow groove is axially arranged at the bottom of the first valve component, and a mounting protrusion is protruded upward on the inner wall of the bottom of the diffusion chamber. The second air flow opening is penetrated by the mounting protrusion. When the first valve component moves downward, the bottom of the limiting flow groove contacts the top of the mounting protrusion and closes the second air flow opening; when the first valve component moves upward, the bottom of the limiting flow groove separates from the top of the mounting protrusion and opens the second air flow opening. The gas is suitable for passing through the second air flow opening and entering the limiting flow groove, and the limiting flow groove is suitable for controlling the speed of the gas.

6. A residual pressure maintaining gas cylinder valve according to claim 5, characterized in that: The air flow channel includes an acceleration channel, the acceleration channel communicating with the first air flow opening and the gas stabilization cavity, the gas being adapted to move upward in the diffusion cavity and enter the acceleration channel through the first air flow opening, thereby entering the gas stabilization cavity; The inner wall of the middle portion of the acceleration channel protrudes radially inward to form a flow limiting portion, and the inner wall of the flow limiting portion defines a flow limiting hole, and the gas is suitable for passing through the flow limiting hole and entering the gas stabilization cavity.

7. A residual pressure maintaining gas cylinder valve according to claim 6, characterized in that: The inner diameters of the two ends of the acceleration channel are D4, and the inner diameter of the flow limiting hole is D3, satisfying D4>D3.

8. A residual pressure maintaining gas cylinder valve according to claim 7, characterized in that: A baffle ring is axially arranged in the air stabilizing cavity. The baffle ring is sleeved on the outside of the screw sleeve. The outer diameter of the baffle ring is smaller than the inner diameter of the inner wall of the air stabilizing cavity, and the inner diameter of the baffle ring is larger than the outer diameter of the tail of the screw sleeve.

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