Cylinder valve with long service life

Abstract

The invention relates to the technical field of fluid control, and discloses a long-life cylinder valve. The long-life gas cylinder valve comprises a handle turncap, a handle sealing core is arranged at the lower end of the handle turncap, the handle sealing core comprises an operation chamber cover, an operation rod plug sealing line, an operation rod, an operation rod spring, an oil seal set and an air seal set, and the operation rod spring, the oil seal set and the air seal set are sequentially arranged around the operation rod in a surrounding mode. A safety helmet and an air outlet nozzle are arranged at the left end and the right end of the valve element respectively, and an air inlet nozzle is arranged at the lower end of the valve element. According to the gas cylinder valve with the long service life, in the closed state, the operating rod is arranged on the other side of a medium in a cylinder, so that the operating rod is not influenced by the pressure of the medium in the cylinder, the operating rod is prevented from bearing pressure for a long time, the possibility of deformation of the operating rod is reduced, and the possibility of generating a gap between the operating rod and a shaft hole is greatly reduced; the leakage of a medium in the bottle is effectively avoided; and in the opening state, the operation chamber and the space outside the valve are effectively isolated by arranging a plurality of pressure-resistant barriers, and the problem of leakage of an existing valve is thoroughly solved.

Description

Technical Field

[0001] The invention relates to the technical field of fluid control, and in particular to a long-life gas cylinder valve. Background Art

[0002] Various widely used gas and liquid bottles, including liquid oxygen, carbon dioxide, propane and oxygen bottles, often have valve leakage problems. Among them, the leakage problem of liquid oxygen bottle valves is particularly prominent. Even newly purchased liquid oxygen bottles often have valve leakage. Although the manufacturer emphasizes that the valve has been repaired, in the actual production process, there will always be problems such as damage to the valve stem seal and bottle valve leakage. Under the same production volume, a liquid oxygen bottle with a leaking bottle valve will be used up in 16 hours, while a liquid oxygen bottle with a non-leaking bottle valve can be used for 72 hours. The related gas loss caused by bottle valve leakage accounts for more than 30% of the total consumption, which greatly increases the production cost. Moreover, the supplier needs to bear the responsibility for the leakage. Therefore, bottle valve leakage will also lead to conflicts between the two parties.

[0003] The existing gas cylinder valve uses sealing packing to compress and block the gap between the valve stem and the shaft sleeve. After several knob pulls and pulls, a wear gap will inevitably appear, which will eventually cause the valve stem to be unable to compress the valve core, and the valve core is not closed tightly, forming a gas escape gap, which will cause the cylinder valve to leak. In addition, the valve core is affected by the medium and exerts a force on the valve stem. When the force exceeds the bending limit of the valve stem, the valve stem will be compressed and deformed, causing the valve core sealing line to break, thereby causing the cylinder valve to leak. Moreover, the deformation of the valve stem will squeeze the oil seal, resulting in a gas escape gap, which will cause the cylinder valve to leak.

[0004] Based on this, how to solve the problem of bottle valve leakage has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to provide a long-life gas cylinder valve, which effectively solves the problem of cylinder valve leakage.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A long-life gas cylinder valve, comprising a handle screw cap 1, a handle sealing core 3 is arranged at the lower end of the handle screw cap 1, the handle sealing core 3 comprises an operating chamber cover 302, an operating rod plug sealing line 303, an operating rod 304, an operating rod spring 310, an oil seal group 311 and an air seal group 314, the operating rod spring 310, the oil seal group 311 and the air seal group 314 are arranged around the operating rod in sequence, a valve core 4 is arranged at the lower end of the handle sealing core 3, a safety cap 5 and an air outlet nozzle 6 are respectively arranged at the left and right ends of the valve core 4, and an air inlet nozzle 7 is arranged at the lower end of the valve core 4.

[0008] Furthermore, the handle screw cap 1 includes a pressing cap 101 , a pressing cap upper spring 102 , a hand wheel 103 and a pressing cap lower spring 104 .

[0009] Furthermore, a copper gasket 2 is provided between the handle screw cap 1 and the handle sealing core 3 .

[0010] Furthermore, the operating rod 304 includes a handwheel 103 bolt for connecting the handwheel 103 in the handle screw cap 1, an operating rod sealing cap 306, an upper tenon 307 of the operating rod, a lower tenon groove 308 of the operating rod and a valve core moving screw 309.

[0011] Furthermore, a sealing ring 301 is provided at the connection between the operating room cover 302 and the operating rod 304 .

[0012] Furthermore, the oil seal assembly 311 includes an oil seal pressure cap 312 and an oil seal 313 , and the oil seal 313 needs to be overlapped and pressed on the circumferential seam of the gas seal assembly 314 .

[0013] Furthermore, the gas seal group 314 includes a sleeve gas seal 315 and a shaft gas seal 316, the gap between the sleeve gas seal 315 and the shaft gas seal 316 is 0.025mm-0.15mm, and the gap between the sleeve gas seal 315 and the shaft gas seal 316 needs to be impregnated with sealing grease to form an oil film.

[0014] Furthermore, the sealing grease is refined by thickening high-viscosity silicone oil with a high-purity inorganic thickener and adding antioxidant and anti-corrosion additives.

[0015] Furthermore, the valve core 4 includes a valve body 401 provided with three guide grooves, a piston ring 402 , a valve core sealing line 403 and three valve core guide plates 404 .

[0016] Furthermore, a safety film is provided inside the safety helmet 5 .

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a long-life gas cylinder valve. In a closed state, an operating rod is placed on the other side of the medium in the bottle, so that the operating rod is not affected by the pressure of the medium in the bottle, thereby avoiding long-term pressure-bearing of the operating rod, eliminating the possibility of deformation of the operating rod, and greatly reducing the possibility of a gap between the operating rod and the shaft hole, thereby effectively avoiding leakage of the medium in the bottle; in an open state, by setting multiple pressure-resistant barriers, the operating room and the space outside the valve are effectively isolated, and the problem of leakage of existing valves is completely solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the long-life gas cylinder valve of the present invention;

[0021] Figure 2 It is a schematic diagram of the planar structure of the long-life gas cylinder valve of the present invention;

[0022] Figure 3 It is a three-dimensional exploded schematic diagram of the long-life gas cylinder valve of the present invention;

[0023] Figure 4 It is a planar explosion schematic diagram of the long-life gas cylinder valve of the present invention;

[0024] Figure 5 It is a partial enlarged view of the oil seal assembly and the gas seal assembly of the long-life gas cylinder valve of the present invention;

[0025] Figure 6 A schematic diagram of a bending deformation or local dimensional deformation of an operating rod;

[0026] In the figure, 1, handle screw cap, 2, copper gasket, 3, handle sealing core, 4, valve core, 5, safety cap, 6, air outlet nozzle, 7, air inlet nozzle, 101, pressure cap, 102, upper spring, 103, handwheel, 104, pressure cap lower spring, 301, sealing ring, 302, operating chamber cover, 303, operating rod plug sealing line, 304, operating rod, 305, handwheel bolt, 306, operating rod sealing cap, 307, upper tenon of operating rod, 308, lower tenon of operating rod, 309, valve core moving screw, 310, operating rod spring, 311, oil seal group, 312, oil seal pressure cap, 313, oil seal, 314, gas seal group, 315, sleeve gas seal, 316, shaft gas seal, 401, valve body, 402, piston ring, 403, valve core sealing line, 404, valve core guide plate. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 therefore should not be understood as a limitation on the present application.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] The tapered threads and dimensions of the external interfaces (including the air inlet nozzle 7 and the air outlet nozzle 6) of the long-life gas cylinder valve provided by the present invention are implemented in accordance with relevant national standards.

[0032] The appearance and size of the long-life gas cylinder valve provided by the present invention are similar to those of the existing valves, so as to ensure that the long-life gas cylinder valve provided by the present invention can replace the existing gas cylinder valve without any obstacles.

[0033] Those skilled in the art may adjust the morphology of the components inside the long-life gas cylinder valve provided by the present invention according to actual needs, and it is not necessary to completely correspond.

[0034] Combination Figures 1 to 5The present embodiment discloses a long-life gas cylinder valve, which includes a handle screw cap 1, a handle sealing core 3 is arranged at the lower end of the handle screw cap 1, the handle sealing core 3 includes an operation chamber cover 302, an operation rod plug sealing line 303, an operation rod 304, an operation rod spring 310, an oil seal group 311 and an air seal group 314, the operation rod spring 310, the oil seal group 311 and the air seal group 314 are arranged around the operation rod in sequence, a valve core 4 is arranged at the lower end of the handle sealing core 3, a safety cap 5 and an air outlet nozzle 6 are respectively arranged at the left and right ends of the valve core 4, and an air inlet nozzle 7 is arranged at the lower end of the valve core 4.

[0035] In a specific embodiment of the present application, the handle screw cap 1 includes a pressing cap 101 , a pressing cap upper spring 102 , a hand wheel 103 and a pressing cap lower spring 104 .

[0036] In a specific embodiment of the present application, a copper gasket 2 is provided between the handle screw cap 1 and the handle sealing core 3 .

[0037] In a specific embodiment of the present application, the operating rod 304 includes a handwheel 103 bolt for connecting the handwheel 103 in the handle screw cap 1, an operating rod sealing cap 306, an operating rod upper tenon 307, an operating rod lower tenon groove 308 and a valve core moving screw 309.

[0038] The gap between the valve stem and the shaft hole is the key to the leakage of existing gas cylinder valves. During the production and use of existing gas cylinder valves, the valve stem may be deformed due to external force or pressure of the medium in the bottle. Figure 6 The bending deformation or local dimensional deformation (deformation from black to red) shown in the figure creates a gap (air pressure escape channel) between the valve stem and the shaft hole, which leads to leakage of the medium in the bottle;

[0039] In the existing gas cylinder valve, the pressure of the medium in the bottle is transmitted to the valve stem through the valve core. When the transmitted pressure exceeds the bearing capacity or the ultimate impact force of the valve stem itself, the valve stem will inevitably have an axial deviation (including the axial deviation of the upper end of the valve stem, the axial deviation of the lower end of the valve stem, and the axial deviation of the entire valve stem); during the process of switching the valve several times, the valve core changes from a constant pressure state to a variable state, that is, the stress state when an impact occurs. In this case, the deviation of the valve stem axial centerline is almost inevitable, and may even cause the valve stem to bend (including bending visible to the naked eye and bending that cannot be directly observed by the naked eye and requires the help of instruments to detect), which will inevitably squeeze the shaft hole to form a gap, that is, a gas pressure escape channel;

[0040] It can be understood that in this embodiment, by adopting the structure of the tenon 307 on the operating rod, the tenon groove 308 on the operating rod and the valve core moving screw 309, when the valve is closed, the operating rod 304 (that is, the valve stem in the existing gas cylinder valve) will not bear the pressure of the medium in the bottle, effectively avoiding the axial centerline deviation and bending of the operating rod 304 under a long-term high-pressure environment, thereby effectively avoiding the generation of a gap (air pressure escape channel) between the operating rod 304 and the shaft hole, thereby avoiding leakage of the medium in the bottle; when the valve is open, the operating rod 304 will bear a certain pressure from the medium in the bottle, which requires that the materials of each component of the operating rod 304 need to meet certain standards.

[0041] In a specific embodiment of the present application, a sealing ring 301 is provided at the connection between the operating chamber cover 302 and the operating rod 304 .

[0042] In a specific embodiment of the present application, the oil seal assembly 311 includes an oil seal pressure cap 312 and an oil seal 313 , and the oil seal 313 needs to be overlapped and pressed on the circumferential seam of the gas seal assembly 314 .

[0043] It can be understood that there are key differences between the use of the oil seal in this embodiment and the prior art. Based on this, the sealing effect of the gas cylinder valve in this embodiment and the prior art is also significantly different. Specifically, after the oil seal pressure cap screw is tightened, the gap between the oil seal and the valve stem and the shaft hole of the existing gas cylinder valve is compacted. However, after the valve stem is operated, the valve stem will move axially and rotate circumferentially, and the shape and position tolerance of the valve stem will have arched backs and bends, which will inevitably cause a gap in the oil seal. Moreover, since the pressure cap screw has been fixed, the new gap generated by the oil seal will not be automatically repaired, which forms a Air pressure escape channel; in contrast, the operating rod 304 of the gas cylinder valve in this embodiment only rotates in a circular motion and does not move axially, which greatly reduces the possibility of a gap in the oil seal. Moreover, after the oil seal pressure cap 312 of the gas cylinder valve in this embodiment is screwed, the oil seal pressure cap 312 is in a process of dynamic compression by the operating rod spring 310. Even if a gap is generated by rotation, since the oil seal pressure cap 312 is in a process of dynamic compression by the operating rod spring 310, the gap generated by the rotation will be automatically repaired, and a gas pressure escape channel will not be formed, thereby effectively avoiding leakage of the medium in the bottle.

[0044] In a specific embodiment of the present application, the air seal group 314 includes a sleeve air seal 315 and a shaft air seal 316, the gap between the sleeve air seal 315 and the shaft air seal 316 is 0.025mm~0.15mm, and the gap between the sleeve air seal 315 and the shaft air seal 316 needs to be impregnated with sealing grease to form an oil film.

[0045] In a specific embodiment of the present application, the injection sealing grease is 7903 sealing grease.

[0046] In a specific embodiment of the present application, the valve core 4 includes a valve body 401 provided with three guide grooves, a piston ring 402 , a valve core sealing line 403 and three valve core guide plates 404 .

[0047] It can be understood that the valve core guide plate 404 in the valve core 4 will cooperate with the valve body 401 and the piston ring 402 to maintain the verticality of the valve core, so that the bottom of the valve core can evenly withstand the pressure applied by the medium in the gas cylinder, thereby ensuring that the entire valve core can maintain uniformity when under force. In addition, the three valve core guide plates 404 set in this embodiment can effectively ensure that during the process of opening the gas cylinder valve, the limited position will not be out of control.

[0048] In a specific embodiment of the present application, a safety film is provided inside the safety helmet 5 .

[0049] It is understandable that when the pressure in the gas cylinder exceeds the specified pressure value, the safety film in the safety cap 5 will burst. At this time, the long-life gas cylinder valve provided in this embodiment can still be used after replacing the safety film in the same way as the existing safety cap 5.

[0050] The long-life gas cylinder valve provided in this embodiment, after the various parts are assembled, needs to use modern process technology, including but not limited to hot melt welding, to make the assembled parts into a whole that meets the pressure failure test.

[0051] When using a long-life gas cylinder valve provided by the present embodiment, the handwheel 103 in the handle screw cap 1 is turned, and the handwheel 103 drives the operating rod 304 to rotate through the handwheel 103 bolt, and there is no axial movement in this process. Inside the operating rod 304, the tenon 307 on the operating rod drives the valve core moving screw 309 to rotate, and there is no axial movement in this process. When the valve core moving screw 309 rotates, the thread applies an axial thrust to the valve core 4, causing the valve core 4 to move up and down axially. When the handwheel 103 is rotated forward, the valve core 4 moves upward to close the valve port, and when the handwheel 103 is rotated backward, the valve core 4 moves downward to leave the valve port, and the medium in the bottle is guided from the air inlet nozzle 7 to the air outlet nozzle 6 through the valve body 401.

[0052] The long-life gas cylinder valve provided in this embodiment prevents leakage of the medium in the gas cylinder from two states: closed and opened. Specifically:

[0053] When the long-life gas cylinder valve is in a closed state, the valve core 4 will tightly press against the valve port to ensure that the valve core sealing line 403 between the valve core 4 and the valve port is compacted, thereby avoiding leakage of the medium in the gas cylinder; in addition, the pressure borne by the valve core 4 is greater than or equal to the product of the pressure of the medium in the gas cylinder and the square of the valve port area. Therefore, as the pressure of the medium in the gas cylinder increases, the pressure of the valve core 4 pointing to the valve port also increases accordingly. From a microscopic perspective, according to the elastic properties of metal, the higher the pressure of the medium in the gas cylinder, the wider the valve core sealing line 403 between the valve core 4 and the valve port will be, thereby making the long-life gas cylinder valve in the closed state more tightly closed;

[0054] For example, the diameter of the sealing line between the valve core 4 and the valve port is 20 mm, and the pressure of the medium in the gas cylinder is 10 kg / cm 2 , then the valve core 4 will be subjected to a force F1≥31kg exerted by the medium to assist the valve core 4 in closing; and when the pressure of the medium in the gas cylinder increases to 30kg / cm 2 , then, the valve core 4 will be subjected to a force F2≥90kg exerted by the medium, which is used to assist the valve core 4 in closing. It can be seen that as the pressure of the medium in the gas cylinder increases, the pressure of the valve core 4 pointing to the valve port increases accordingly, and the valve core sealing line 403 between the valve core 4 and the valve port will become wider, and the long-life gas cylinder valve will be closed more tightly;

[0055] When the long-life gas cylinder valve is in an open state, the long-life gas cylinder valve provided in this embodiment is provided with six pressure barriers, the first pressure barrier being a piston ring 402 provided in the valve core 4, the piston ring 402 being able to reduce the clearance between the upper end of the valve core 4 and the circumference to 2 / 360 of the original clearance, thereby effectively reducing the leakage of the medium in the gas cylinder;

[0056] The second pressure-resistant barrier is the gas seal group 314 arranged in the handle sealing core 3. The gas seal group 314 will be subject to the upward axial driving force of the medium in the gas cylinder and the downward axial driving force of the operating rod spring 310, so that the sleeve gas seal 315 and the shaft gas seal 316 are tightly fitted, and the lubricating grease in the gap between the sleeve gas seal 315 and the shaft gas seal 316 will form an oil film, thereby effectively blocking the leakage of the medium in the gas cylinder; the third pressure-resistant barrier is the oil seal group 311 arranged in the handle sealing core 3. The oil seal group 311 is pressed on the circumferential seam of the gas seal group 314, and directly blocks the possible medium in the gas cylinder with the bottom surface of the oil seal 313, further ensuring that the medium in the gas cylinder will not leak; the fourth pressure-resistant barrier is the operating rod plug sealing line 303 arranged in the handle sealing core 3. The operating rod sealing cap 306 will be subject to the upward axial driving force of the operating rod spring 310 and the medium in the gas cylinder, so that the operating rod plug sealing line 303 between the operating rod sealing cap 306 and the operating chamber cover 302 is compacted. , further avoiding the leakage of the medium in the gas cylinder, and the operating rod plug sealing line 303 is the same as the valve core sealing line 403. If there is gas leakage into the operating room, then as its pressure increases, the pressure of the operating rod sealing cap 306 pointing to the operating room cover 302 increases accordingly, and the sealing line of the plug on the operating rod is pressed and closed more tightly, so no leakage will occur; the fifth pressure-resistant barrier is a sealing ring 301 arranged in the handle sealing core 3, and the sealing ring 301 can effectively prevent the medium in the bottle from overflowing the operating room cover 302; the sixth pressure-resistant barrier is a copper gasket 2 arranged between the operating room cover 302 and the handle screw cap 1. When high-pressure gas overflows into the operating rod chamber accidentally, the operator increases the force of pressing the operating handle downward, and this force is greater than the top force applied by the main spring and the air pressure to the plug connected to the operating rod, and there is still airflow overflowing from the valve cover hole on the operating rod. At this time, the copper gasket 2 can effectively prevent the medium in the bottle from overflowing the operating room cover 302, thereby achieving a multiple sealing effect;

[0057] Among these six pressure-resistant barriers, the second pressure-resistant barrier air seal group 314 and the fourth pressure-resistant barrier operating rod plug seal line 303 are fully capable of isolating the operating room from the space outside the valve. As for the other four pressure-resistant barriers, they provide multiple guarantees for the sealing effect.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A long-life gas cylinder valve, characterized in that: The long-life gas cylinder valve includes a handle screw cap, a handle sealing core is arranged at the lower end of the handle screw cap, the handle sealing core includes an operating chamber cover, an operating rod plug sealing line, an operating rod, an operating rod spring, an oil seal group and an air seal group, the operating rod spring, the oil seal group and the air seal group are arranged around the operating rod in sequence, a valve core is arranged at the lower end of the handle sealing core, safety caps and air outlet nozzles are respectively arranged at the left and right ends of the valve core, and an air inlet nozzle is arranged at the lower end of the valve core.

2. A long-life gas cylinder valve according to claim 1, characterized in that: The handle rotating cap comprises a pressing cap, a pressing cap upper spring, a hand wheel and a pressing cap lower spring.

3. A long-life gas cylinder valve according to claim 1, characterized in that: A copper gasket is arranged between the handle screw cap and the handle sealing core.

4. A long-life gas cylinder valve according to claim 1, characterized in that: The operating rod comprises a handwheel bolt 305 for connecting the handwheel in the handle screw cap, an operating rod sealing cap 306, an upper tenon 307 of the operating rod, a lower tenon groove 308 of the operating rod and a valve core moving screw 309.

5. A long-life gas cylinder valve according to claim 1, characterized in that: A sealing ring is provided at the connection between the operating room cover and the operating rod.

6. A long-life gas cylinder valve according to claim 1, characterized in that: The oil seal group includes an oil seal pressure cap and an oil seal, and the oil seal needs to be overlapped and pressed on the circumferential seam of the air seal group.

7. A long-life gas cylinder valve according to claim 1, characterized in that: The gas seal group comprises a sleeve gas seal and a shaft gas seal, the gap between the sleeve gas seal and the shaft gas seal is 0.025mm-0.15mm, and the gap between the sleeve gas seal and the shaft gas seal needs to be impregnated with sealing grease to form an oil film.

8. A long-life gas cylinder valve according to claim 1, characterized in that: The valve core comprises a valve body provided with three guide grooves, a piston ring, a valve core sealing line and three valve core guide plates.

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