Gas mechanical self-closing valve with over-flow limit function

Abstract

The present invention relates to a gas mechanical self-closing valve with an ultra-flow limit function, which includes a main valve body and a valve stem. It also includes a fixed cylinder disposed near the gas inlet of the main valve body in the main valve body. The fixed cylinder includes an inner plate portion of the fixed cylinder through which the valve stem is inserted. Air holes surrounding the valve stem are provided on the inner plate portion of the fixed cylinder. A plug is provided at one end of the valve stem extending outward from the inner plate portion of the fixed cylinder. The gas mechanical self-closing valve with an ultra-flow limit function further includes a flow-limiting sleeve disposed on the valve stem between the plug and the inner plate portion of the fixed cylinder. The projection of the flow-limiting sleeve in the axial direction of the valve stem intersects with the air holes on the inner plate portion of the fixed cylinder. A flow-limiting sleeve return spring for applying a force away from the inner plate portion of the fixed cylinder to the flow-limiting sleeve is also provided in the main valve body. When the flow rate is too large, under the action of air pressure, the limit sleeve moves leftward, covering the air holes on the inner plate of the fixed cylinder, reducing the flow-through area and lowering the flow rate.

Description

Technical Field

[0001] The invention belongs to the field of gas valves, and in particular relates to a gas mechanical self-closing valve with an excess flow limiting function. 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] The 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. 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 and will hinder the flow of gas regardless of whether the flow is too large or normal, thereby increasing 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 gas mechanical self-closing valve with an excess flow limiting function to solve the problem that the existing gas self-closing valve has a poor flow limiting effect.

[0005] To achieve the above-mentioned objectives, the gas-fired mechanical self-closing valve with an excess flow limiting function of the present invention adopts the following technical scheme: the gas-fired mechanical self-closing valve with an excess flow limiting function comprises a main valve body and a valve stem, and also comprises a fixed cylinder arranged in the main valve body near the gas inlet of the main valve body, the fixed cylinder comprising a fixed cylinder inner plate portion for the valve stem to pass through, the fixed cylinder inner plate portion is provided with an air hole arranged around the valve stem, a plug is provided at one end of the valve stem extending outward from the fixed cylinder inner plate portion, the gas-fired mechanical self-closing valve with an excess flow limiting function also comprises a flow limiting sleeve arranged 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 with the air hole on the fixed cylinder inner plate portion, and a flow limiting sleeve reset spring for applying a force to the flow limiting sleeve away from the fixed cylinder inner plate portion is also provided in the main valve body.

[0006] Beneficial effects: When the gas flow is normal usually, the limiting sleeve abuts against the plug on the valve stem under the action of the limiting sleeve spring, which has no influence on the gas flow. When the gas flow is too large, under the action of the air pressure, the limiting sleeve moves leftward against the elastic force of the limiting sleeve return spring. Since the projection of the current-limiting sleeve on the valve stem axis intersects with the air holes on the inner plate part of the fixed cylinder, the axial air holes on the valve stem are partially blocked, and the effective flow area is reduced. The larger the gas flow, the closer the limiting sleeve is to the inner plate part of the fixed cylinder, further restricting the flow. Compared with the prior art, it does not affect the normal operation of the self-closing valve usually, and the current-limiting intensity increases with the increase of the gas flow, and the current-limiting effect is good.

[0007] Further, the current-limiting sleeve has a cylindrical part. An outer ring of the current-limiting sleeve is provided on the outer wall of one end of the cylindrical part close to the inner plate part of the fixed cylinder. The limiting sleeve return spring is arranged on the valve stem between the inner plate of the fixed cylinder and the current-limiting sleeve. An inner ring groove for the limiting sleeve return spring to enter is provided on the inner wall of the cylindrical part.

[0008] Further, the fixed cylinder further includes a cylindrical part of the fixed cylinder arranged outside the inner plate of the fixed cylinder. An external thread of the fixed cylinder is provided on the outer wall of the cylindrical part of the fixed cylinder. 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.

[0009] Further, the size of the plug in the radial direction of the valve stem is larger than the aperture of the cylindrical part of the fixed cylinder. The plug is used to cooperate with the outer port of the cylindrical part of the fixed cylinder. Brief Description of the Drawings

[0010] 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, other drawings can be obtained based on these drawings without creative efforts;

[0011] Figure 1 is a perspective view of the gas mechanical self-closing valve with an over-flow limiting function of the present invention;

[0012] Figure 2 is a front view of the gas mechanical self-closing valve with an over-flow limiting function of the present invention;

[0013] Figure 3 is Figure 2 the right view of

[0014] Figure 4 is Figure 3 a cross-sectional view along the A-A section;

[0015] Figure 5 is Figure 4 the enlarged view at B in

[0016] Figure 6 is the three-dimensional view of the guiding core Figure 1 ;

[0017] Figure 7 is the three-dimensional view of the guiding core Figure 2 ;

[0018] Figure 8 is the three-dimensional view of the guiding core Figure 3 ;

[0019] Figure 9 is the structural schematic diagram of the lifting rod;

[0020] Figure 10 is the structural schematic diagram of the flow-limiting sleeve;

[0021] Figure 11 is the structural schematic diagram of the valve stem;

[0022] Figure 12 is the three-dimensional view of the fixed cylinder Figure 1 ;

[0023] Figure 13 is the three-dimensional view of the fixed cylinder Figure 2 ;

[0024] Figure 14 is the structural schematic diagram of the cooperation position between the limiting body and the valve stem in other embodiments.

[0025] In the figure: 100 - main valve body, 110 - fixed cylinder, 111 - cylinder part of the fixed cylinder, 112 - inner plate part of the fixed cylinder, 113 - air hole, 120 - plug, 130 - guiding core, 131 - guiding groove, 132 - central through hole of the guiding core, 140 - air film adjusting spring, 150 - spring pressure adjusting nut, 160 - flow-limiting sleeve, 161 - cylinder part, 162 - outer ring of the flow-limiting sleeve, 163 - inner ring groove of the flow-limiting sleeve, 170 - return spring of the flow-limiting sleeve, 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 - return spring of the valve stem, 800 - lifting rod, 900 - roller, 910 - limiting body. Specific embodiments

[0026] 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.

[0027] Specific embodiments of the gas mechanical self-closing valve with an over-flow limiting function, such as Figures 1 to 13As 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.

[0028] 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.

[0029] The gas mechanical self-closing valve with an excess flow limiting function 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 passes 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 passes through from left to right.

[0030] 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.

[0031] The gas mechanical self-closing valve with an excess flow limiting function 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 having a cylindrical part 161, and a flow limiting sleeve outer ring 162 is provided on the outer wall of the cylindrical part 161 close to one end of the fixed cylinder inner plate part 112, and 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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. A gas mechanical self-closing valve with a super flow limit function, comprising a main valve body and a valve rod, characterized in that: It further includes a fixed cylinder disposed in the main valve body near the gas inlet of the main valve body. The fixed cylinder includes an inner plate portion of the fixed cylinder through which the valve stem is inserted. Air holes are provided on the inner plate portion of the fixed cylinder around the valve stem. A plug is provided at one end of the valve stem extending outwards from the inner plate portion of the fixed cylinder. The gas mechanical self-closing valve with an over-flow limiting function further includes a flow-limiting sleeve disposed on the valve stem between the plug and the inner plate portion of the fixed cylinder. The projection of the flow-limiting sleeve in the axial direction of the valve stem intersects with the air holes on the inner plate portion of the fixed cylinder. A flow-limiting sleeve return spring for applying a force away from the inner plate portion of the fixed cylinder is also provided in the main valve body. The upper part of the lifting rod is of a round rod structure and the lower part is of a U-shaped fork structure. An air film adjusting spring is sleeved on the round rod structure. A spring pressure adjusting nut is provided at the upper port of the valve cover. The upper end of the air film adjusting spring abuts against the spring pressure adjusting nut. A roller is provided at the lower end of the U-shaped fork. The center line of the roller is perpendicular to the center line of the lifting rod. The left end of the valve stem is a swollen end with a frustum-like structure. Under the action of the valve stem return spring, the small end face of the swollen end abuts against the outer circular surface of the roller.

2. The gas mechanical self-closing valve with an ultra-flow limit function according to claim 1, characterized in that: The flow-limiting sleeve has a cylindrical portion. An outer ring of the flow-limiting sleeve is provided on the outer wall of the cylindrical portion near one end of the inner plate portion of the fixed cylinder. The flow-limiting sleeve return spring is disposed 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 portion.

3. The gas mechanical self-closing valve with an ultra-flow limit function according to claim 1 or 2, characterized in that: The fixed cylinder further includes a cylindrical body portion of the fixed cylinder disposed outside the inner plate of the fixed cylinder. External threads of the fixed cylinder are provided on the outer wall of the cylindrical body portion of the fixed cylinder. Internal threads adapted to the external threads of the fixed cylinder are provided on the inner wall of the main valve body. The fixed cylinder is screwed onto the main valve body through the external threads of the fixed cylinder.

4. The gas mechanical self-closing valve with an ultra-flow limit function according to claim 3, characterized in that: The size of the plug in the radial direction of the valve stem is larger than the aperture of the cylindrical body portion of the fixed cylinder. The plug is used to cooperate with the outer port of the cylindrical body portion of the fixed cylinder.

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