Multi-functional Gas Mechanical Self-closing Valve

Abstract

The present invention relates to a multifunctional gas mechanical self-closing valve, which includes a main valve body, a valve stem, and a lifting rod. A limiting body for horizontally blocking and limiting the valve stem is provided at the lower end of the lifting rod. The left end of the valve stem abuts against the limiting body under the action of a valve stem return spring. The blocking surface of the limiting body for blocking the valve stem and / or the pressing surface of the valve stem for pressing the limiting body are convex surfaces that are wider in the middle and narrower at the top and bottom; a fixed cylinder is provided near the gas inlet of the main valve body in the main valve body. The fixed cylinder includes a fixed cylinder inner plate part through which the valve stem is inserted. Air holes surrounding the valve stem are provided on the fixed cylinder inner plate part. A plug is provided at one end of the valve stem extending out of the fixed cylinder inner plate part. A flow limiting sleeve is provided on the valve stem. The projection of the flow limiting sleeve in the axial direction of the valve stem intersects with the air holes on the fixed cylinder inner plate part. A flow limiting sleeve return spring is also provided in the main valve body. Compared with the prior art, a gas safety self-closing valve with both pressure limiting and flow limiting functions is provided.

Description

Technical Field

[0001] The invention belongs to the field of gas valves, and in particular relates to a multifunctional gas mechanical self-closing valve. Background Art

[0002] Household gas must be used within the appropriate output pressure range so that the flame height is safe and can be used. When the output pressure of the gas is too high, the flame will be jet-like and difficult to control, which can easily burn the human body or ignite surrounding objects by mistake, causing a fire. When the gas output pressure is insufficient, a trace output will be formed, which cannot provide continuous combustion for the stove. If the fire is extinguished, the gas will maintain a trace output and spread in the air, which can easily cause poisoning, fire, etc.

[0003] There are many kinds of gas self-closing valves on the market. For example, a Chinese invention patent application discloses a gas safety self-closing valve (publication number: CN110792814A, publication date: 2020.02.14), including a valve seat, a valve stem, a rubber diaphragm, a detent rod, and a fixed ring. The detent rod and the valve stem are transmitted through a set of connecting rod assemblies. The upward or downward movement of the detent rod gives the valve stem a space to move toward the fixed position. When the plug at the end of the valve stem is against the fixed ring, the air hole on the fixed ring is blocked to achieve self-closing. The connecting rod assembly has a complex structure, many parts, and is difficult to assemble. It is easy to fail due to mechanical failure after long-term operation. In addition, a flow-limiting valve plate is provided on the inner wall of the gas inlet of the valve body. The flow-limiting valve plate is fixed. Regardless of whether the flow is too large or normal, it will hinder the flow of gas and increase the pressure of the front gas pipeline. When the gas flow is too large, the flow-limiting effect is very limited. Summary of the invention

[0004] The purpose of the present invention is to provide a multifunctional gas mechanical self-closing valve to solve the problem that the existing gas self-closing valve has a complex structure and is prone to failure.

[0005] To achieve the above-mentioned purpose, the multifunctional gas mechanical self-closing valve of the present invention adopts the following technical scheme: the multifunctional gas mechanical self-closing valve comprises a main valve body, a valve stem and a lifting rod, the lower end of the lifting rod is provided with a limiting body for horizontally stopping and limiting the valve stem, the left end of the valve stem is pressed against the limiting body under the action of the valve stem reset spring, the stopping surface of the limiting body for stopping the valve stem and / or the pressing surface of the valve stem for pressing the limiting body are outer convex surfaces which are wide in the middle and narrow at the top and bottom; the multifunctional gas mechanical self-closing valve also comprises a main valve body in the main valve body close to the main valve body. A fixed cylinder is arranged at the gas inlet, and the fixed cylinder includes a fixed cylinder inner plate part for the valve stem to pass through, the fixed cylinder inner plate part is provided with an air hole arranged around the valve stem, and one end of the valve stem extending outward from the fixed cylinder inner plate part is provided with a plug. The multifunctional gas mechanical self-closing valve also includes a flow limiting sleeve arranged on the valve stem between the plug and the fixed cylinder inner plate part, the projection of the flow limiting sleeve in the axial direction of the valve stem intersects with the air hole on the fixed cylinder inner plate part, and the main valve body is also provided with a flow limiting sleeve reset spring for applying a force to the flow limiting sleeve away from the fixed cylinder inner plate part.

[0006] Beneficial effects: When the gas pressure is normal, the center line of the limiter and the center line of the valve stem are in the same horizontal plane, the limiter is in the middle position, and the self-closing valve remains open. When the gas pressure is too high or too low, the gas film drives the lifting rod to move up or down, and the center line of the limiter and the center line of the valve stem are staggered. Under the action of the valve stem reset spring, the valve stem moves to the left for a section, and the plug on the valve stem blocks the gas channel in the main valve body, and the self-closing valve is closed. Compared with the existing technology, the transmission structure between the valve stem and the lifting rod is greatly simplified, the assembly is simple, the failure rate is low, the number of parts is reduced, and the cost is reduced.

[0007] When the gas flow is normal, the limit sleeve rests against the plug on the valve stem under the action of the limit sleeve spring, which has no effect on the gas flow. When the gas flow is too large, the limit sleeve is on the limit sleeve under the action of the gas pressure, and the limit sleeve overcomes the elastic force of the limit sleeve reset spring and moves to the left. Since the projection of the flow-limiting sleeve in the axial direction of the valve stem intersects with the air hole on the inner plate of the fixed cylinder, the axial air hole of the valve stem is partially blocked, and the effective flow area of ​​the air hole is reduced. The larger the gas flow, the closer the limit sleeve is to the inner plate of the fixed cylinder, and the stronger the flow-limiting effect. Compared with the prior art, it does not affect the normal operation of the self-closing valve, and the flow-limiting strength increases with the increase of gas flow, and the flow-limiting effect is good.

[0008] Furthermore, the limiting body is a cylindrical roller, the center line of the roller extends along the front-rear direction, and the stopping surface is formed by the outer circumferential surface of the roller.

[0009] Furthermore, one end of the valve stem facing the limiting body is a truncated cone-shaped enlarged end, the cross section of the enlarged end gradually increases from left to right, and the top pressure surface is formed by the small end surface of the enlarged end.

[0010] Further, the part of the lifting rod above the air film is of a cylindrical structure, and the part of the lifting rod below the air film is of a U-shaped fork structure. The U-shaped fork is stuck outside the limiting body.

[0011] Further, the multi-functional gas mechanical self-closing valve further includes a guiding core arranged below the air film in the main valve body. The guiding core is provided with a guiding groove that penetrates up and down and has a cross-section in the shape of a cross. Both the limiting body and the lifting rod are guidingly assembled in the guiding groove. A guiding core central through hole that penetrates left and right is provided on the side wall of the guiding core.

[0012] Further, an air film adjusting spring for adjusting the deformation characteristics of the air film is sleeved on the cylindrical part of the lifting rod. A valve cover is arranged on the main valve body outside the air film. A spring pressure adjusting nut is screwed on the upper port of the valve cover. The upper end of the air film adjusting spring abuts against the spring pressure adjusting nut.

[0013] Further, the flow-limiting sleeve has a cylindrical part. An outer ring of the flow-limiting sleeve is provided on the outer wall of the cylindrical part near one end close to the inner plate of the fixed cylinder. The flow-limiting sleeve return spring is arranged on the valve stem between the inner plate of the fixed cylinder and the flow-limiting sleeve. An inner ring groove for the flow-limiting sleeve return spring to enter is provided on the inner wall of the cylindrical part.

[0014] Further, the fixed cylinder further includes a fixed cylinder body part arranged outside the inner plate of the fixed cylinder. An external thread of the fixed cylinder is provided on the outer wall of the fixed cylinder body part. An internal thread adapted to the external thread of the fixed cylinder is provided on the inner wall of the main valve body. The fixed cylinder is screwed onto the main valve body through the external thread of the fixed cylinder.

[0015] Further, the size of the plug in the radial direction of the valve stem is larger than the aperture of the fixed cylinder body part. The plug is used to cooperate with the outer port of the fixed cylinder body part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0017] Figure 1 is a perspective view of the multi-functional gas mechanical self-closing valve;

[0018] Figure 2 is a front view of the multi-functional gas mechanical self-closing valve;

[0019] Figure 3 is Figure 2 the right view of

[0020] Figure 4 is Figure 3 a cross-sectional view along the A-A section;

[0021] Figure 5 is Figure 4 An enlarged view of part B in

[0022] Figure 6 is a three-dimensional view of the guide core Figure 1 ;

[0023] Figure 7 is a three-dimensional view of the guide core Figure 2 ;

[0024] Figure 8 is a three-dimensional view of the guide core Figure 3 ;

[0025] Figure 9 is a structural schematic diagram of the lifting rod

[0026] Figure 10 is a structural schematic diagram of the flow-limiting sleeve

[0027] Figure 11 is a structural schematic diagram of the valve stem

[0028] Figure 12 is a three-dimensional view of the fixed cylinder Figure 1 ;

[0029] Figure 13 is a three-dimensional view of the fixed cylinder Figure 2 ;

[0030] Figure 14 is a structural schematic diagram of the cooperation position between the limiting body and the valve stem in other embodiments.

[0031] In the figure: 100 - main valve body, 110 - fixed cylinder, 111 - fixed cylinder body part, 112 - fixed cylinder inner plate part, 113 - air hole, 120 - plug, 130 - guide core, 131 - guide groove, 132 - guide core central through hole, 140 - air film adjusting spring, 150 - spring pressure adjusting nut, 160 - flow-limiting sleeve, 161 - cylindrical part, 162 - flow-limiting sleeve outer ring, 163 - flow-limiting sleeve inner ring groove, 170 - flow-limiting sleeve return spring, 200 - valve cover, 300 - button cap, 400 - lifting cap, 500 - manual ball valve, 600 - air film, 700 - valve stem, 701 - enlarged end, 702 - T-shaped end, 710 - valve stem return spring, 800 - lifting rod, 900 - roller, 910 - limiting body. Specific embodiments

[0032] In order to make the technical objectives, technical solutions and beneficial effects of the present invention clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] Specific embodiments of the multifunctional gas mechanical self-closing valve, such asFigures 1 to 13 As shown, it includes a main valve body 100, a valve cover 200, a button cap 300, a lifting cap 400, a manual ball valve 500, an air film 600, a valve stem 700, and a lifting rod 800. A fixed cylinder 110 is arranged in the main valve body 100 near the gas inlet of the main valve body. The fixed cylinder 110 includes a fixed cylinder body part 111 and a fixed cylinder inner plate part 112. The fixed cylinder 110 is screwed onto the main valve body 100 through threads on the outer wall of the fixed cylinder body part 111. The valve stem 700 is guided and installed on the fixed cylinder inner plate part 112. The fixed cylinder inner plate part 112 is provided with a plurality of air holes 113 arranged around the valve stem 700.

[0034] The upper part of the lifting rod 800 is a round rod structure, and the lower part is a U-shaped fork structure. The round rod structure is sleeved with an air film regulating spring 140. The upper port of the valve cover 200 is provided with a spring pressure regulating nut 150, and the upper end of the air film regulating spring 140 is against the spring pressure regulating nut 150. A roller 900 is provided at the lower end of the U-shaped fork, and the center line of the roller 900 is perpendicular to the center line of the lifting rod 800. The left end of the valve stem 700 is an enlarged end 701 of a truncated cone structure. Under the action of the valve stem reset spring 710, the small end face of the enlarged end 701 is against the outer circumferential surface of the roller 900. The right end of the valve stem 700 is a T-shaped end 702, and the T-shaped end 702 is provided with a plug 120 for blocking or opening the outer port of the fixed cylinder body part 111.

[0035] The multifunctional gas mechanical self-closing valve also includes a guide core 130 arranged below the air film 600 in the main valve body 100, and the guide core 130 is provided with a guide groove 131 which runs through from top to bottom and has a cross-shaped cross section. The roller 900 and the U-shaped fork are both guided and assembled in the guide groove 131, and the side wall of the guide core 130 is provided with a guide core center through hole 132 which runs through from left to right.

[0036] When the gas pressure in the main valve body 100 is normal, the center line of the roller 900 and the center line of the valve stem 700 are in the same horizontal plane. When the gas pressure in the main valve body 100 is too high or too low, the air film 600 will be deformed. The air film 600 drives the lifting rod 800 to move up or down, which will cause the center line of the roller 900 and the center line of the valve stem 700 to be offset. Under the action of the valve stem reset spring 710, the valve stem 700 moves to the left for a certain distance, and the plug 120 blocks the port of the fixed cylinder 110, and the self-closing valve is closed. After troubleshooting, press down the button cap 300, and then lift the lifting cap 400 to reset the roller 900 and reopen the self-closing valve. Compared with the prior art, the transmission structure between the valve stem 700 and the lifting rod 800 is greatly simplified, the assembly is simple, the failure rate is low, the number of parts is reduced, and the cost is reduced.

[0037] The multifunctional gas mechanical self-closing valve also includes a flow limiting sleeve 160 arranged on the valve stem 700 between the plug 120 and the fixed cylinder inner plate part 112. The flow limiting sleeve 160 has a cylindrical part 161. The cylindrical part 161 is provided with a flow limiting sleeve outer ring 162 on the outer wall near one end of the fixed cylinder inner plate part 112. The projection of the flow limiting sleeve outer ring 162 in the axial direction of the valve stem 700 intersects with the air hole 113 on the fixed cylinder inner plate part 112.

[0038] The limiting sleeve return spring 170 is arranged on the valve stem 700 between the fixed cylinder inner plate part 112 and the limiting sleeve 160, and is used to apply a force to the limiting sleeve 160 away from the fixed cylinder inner plate part 112. The inner wall of the cylindrical part 161 is provided with a limiting sleeve inner ring groove 163 for the limiting sleeve return spring 170 to enter.

[0039] When the gas flow rate suddenly increases during operation, the fluid pressure acts on the flow-limiting sleeve 160, and the flow-limiting sleeve 160 overcomes the pressure of the flow-limiting sleeve reset spring 170 and moves toward the fixed cylinder inner plate part 112, blocking the air hole 113 and limiting the gas flow. The greater the flow rate, the closer the flow-limiting sleeve 160 is to the fixed cylinder inner plate part 112, and the more obvious the blocking effect on the air hole 113, so that the gas flow rate is further reduced. When the gas pressure returns to normal, the flow-limiting sleeve 160 is reset under the action of the flow-limiting sleeve reset spring 170. Compared with the prior art, the flow-limiting effect increases with the increase of the flow rate. When the process is normal, the flow-limiting sleeve remains in place without affecting the normal use of gas.

[0040] In other embodiments, other structural forms of the limiter and the valve stem may also be used, such as Figure 14 As shown, the limit body 910 is a block structure, and the right side of the limit body 910 is an outer convex surface which is wide in the middle and narrow at the top and bottom. The left end of the valve stem 700 is against the limit body 910. During operation, as the gas pressure changes, the limit body 910 moves upward or downward along with the lifting rod. After the center line of the limit body 910 is offset from the center line of the valve stem 700, the valve stem 700 moves to the left, closing the gas channel in the main valve body, and the self-closing valve is closed.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate but not limit the technical solutions of the present invention, and any equivalent substitutions of the present invention and any modifications or partial substitutions that do not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. Multifunctional gas mechanical self-closing valve, comprising a main valve body, a valve stem, and a lifting rod, characterized in that: A limiting body for horizontally blocking and limiting the valve stem is provided at the lower end of the lifting rod. The left end of the valve stem abuts against the limiting body under the action of the valve stem return spring. The blocking surface of the limiting body for blocking the valve stem and the pressing surface of the valve stem for pressing the limiting body are convex surfaces that are wider in the middle and narrower at the top and bottom. The multifunctional gas mechanical self-closing valve further includes a fixed cylinder disposed in the main valve body near the gas inlet of the main valve body. The fixed cylinder includes a fixed cylinder inner plate portion through which the valve stem is inserted. Air holes surrounding the valve stem are provided on the fixed cylinder inner plate portion. A plug is provided at one end of the valve stem extending out of the fixed cylinder inner plate portion. The fixed cylinder further includes a fixed cylinder body portion disposed outside the fixed cylinder inner plate. An external thread of the fixed cylinder is provided on the outer wall of the fixed cylinder body portion. An internal thread adapted to the external thread of the fixed cylinder is provided on the inner wall of the main valve body. The fixed cylinder is screwed onto the main valve body through the external thread of the fixed cylinder. The multifunctional gas mechanical self-closing valve further includes a flow limiting sleeve disposed on the valve stem between the plug and the fixed cylinder inner plate portion. The projection of the flow limiting sleeve in the axial direction of the valve stem intersects the air holes on the fixed cylinder inner plate portion. A flow limiting sleeve return spring for applying a force away from the fixed cylinder inner plate portion to the flow limiting sleeve is further provided in the main valve body. The limiting body is a cylindrical roller, and the center line of the roller extends in the front-rear direction. The blocking surface is formed by the outer circular surface of the roller.

2. The multifunctional gas mechanical self-closing valve according to claim 1, characterized in that: One end of the valve stem facing the limiting body is a frustum-shaped enlarged end, and the cross-section of the enlarged end gradually increases from left to right. The pressing surface is formed by the small end surface of the enlarged end.

3. The multifunctional gas mechanical self-closing valve according to claim 1 or 2, characterized in that: The part of the lifting rod above the air film is a cylindrical structure, and the part of the lifting rod below the air film is a U-shaped fork structure. The U-shaped fork is stuck outside the limiting body.

4. The multifunctional gas mechanical self-closing valve according to claim 3, characterized in that: The multifunctional gas mechanical self-closing valve further includes a guide core disposed in the main valve body below the air film. A guide groove that penetrates up and down and has a cross-section in the shape of a cross is provided on the guide core. The limiting body and the lifting rod are both guidingly assembled in the guide groove. A guide core central through hole that penetrates left and right is provided on the side wall of the guide core.

5. The multifunctional gas mechanical self-closing valve according to claim 3, characterized in that: An air film adjusting spring for adjusting the deformation characteristics of the air film is sleeved on the cylindrical part of the lifting rod. A valve cover is provided on the main valve body outside the air film. A spring pressure adjusting nut is screwed at the upper port of the valve cover. The upper end of the air film adjusting spring abuts against the spring pressure adjusting nut.

6. The multifunctional gas mechanical self-closing valve according to claim 1, characterized in that: The flow limiting sleeve has a cylindrical part. An outer ring of the flow limiting sleeve is provided on the outer wall of one end of the cylindrical part close to the fixed cylinder inner plate portion. The flow limiting sleeve return spring is disposed on the valve stem between the fixed cylinder inner plate and the flow limiting sleeve. An inner ring groove for the flow limiting sleeve return spring to enter is provided on the inner wall of the cylindrical part.

7. The multifunctional gas mechanical self-closing valve according to claim 1, characterized in that: The size of the plug in the radial direction of the valve stem is larger than the aperture of the fixed cylinder body portion. The plug is used to cooperate with the outer port of the fixed cylinder body portion.

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