Pipeline gas self-closing valve

Abstract

This invention relates to a self-closing valve for pipeline gas, comprising a valve cover, a valve ball, a sealing ring, a valve stem, a handle, a sealing cap, and a valve body. The valve body has a first flow channel and a second flow channel along its horizontal axis. The valve stem is vertically positioned within the valve stem channel. The valve ball has a through hole extending along its diameter. A sealing cavity is formed between the sealing cap and the vertical flow channel. The first flow channel and the sealing cavity are connected via a transition channel. A spherical or conical sealing portion is provided at the top of the vertical flow channel, and the spherical or conical sealing portion employs a hard seal. When the sealing portion rises to connect the vertical flow channel with the sealing cavity, fluid entering the sealing cavity from the first flow channel and the transition channel can pass through the vertical flow channel and the second flow channel and exit from the outlet end of the second flow channel. When the sealing portion descends to isolate the vertical flow channel from the sealing cavity, fluid entering the sealing cavity from the first flow channel and the transition channel is prevented from entering the vertical flow channel and the second flow channel.

Description

Technical Field

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

[0002] In the prior art, pipeline gas self-closing valves are usually sealed with rubber pads, and the materials of the rubber pads include nitrile rubber, natural rubber and chloroprene rubber. Since rubber pads made of rubber materials have poor high temperature resistance and are prone to aging and deformation in high temperature environments, and rubber materials are not fireproof, and the rubber pad seals in the prior art are all planar rubber pad seals, the sealing performance of pipeline gas self-closing valves cannot meet the use requirements in this field. Summary of the invention

[0003] The present invention aims to provide a pipeline gas self-closing valve, and the technical problems to be solved include how to improve the fireproof performance and sealing performance of the pipeline gas self-closing valve.

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and provide a pipeline gas self-closing valve, including a valve cover, a valve ball, a sealing ring, a valve stem, a handle, a sealing cover and a valve body, wherein the valve body is a horizontal tubular member, and a first flow passage and a second flow passage are arranged in the horizontal axis direction of the valve body; an inlet is arranged at one end of the first flow passage, and an outlet is arranged at the other end; the valve cover is fixedly installed at the inlet of the first flow passage, and a valve cover channel is arranged in the central axis direction of the valve cover, and the valve cover channel is connected to the first flow passage, so that the inlet of the valve cover channel is connected to the first The flow passage is connected; the valve ball is rotatably arranged in the first flow passage, and the sealing ring is arranged at the position where the outer peripheral wall of the valve ball contacts the inner wall of the first flow passage; a protruding tube extending in a direction perpendicular to the central axis of the first flow passage is arranged on the outer peripheral wall of the first flow passage, and a valve stem passage is arranged at the center of the protruding tube; the valve stem is vertically arranged in the valve stem passage; one end of the valve stem is fixedly installed on the top of the valve ball, and the other end of the valve stem is fixedly connected to the handle, and the valve stem and the valve ball are driven to rotate by rotating the handle; the valve The ball is provided with a through hole extending along the diameter of the valve ball. When the valve ball is rotated, the through hole is switched between a conducting state in which the through hole is connected to the first flow channel and a blocking state in which the through hole is blocked from the first flow channel. The inlet end of the second flow channel is connected to the vertical flow channel. The central axis of the vertical flow channel is perpendicular to the central axis of the second flow channel. A sealed cavity is formed between the sealing cover and the vertical flow channel. The first flow channel is connected to the sealed cavity through a transition channel. A spherical or conical sealing portion is provided on the top of the vertical flow channel. The spherical or conical sealing portion adopts a hard seal; the sealing portion can rise or fall in response to the pressure of the fluid entering the sealing cavity from the first flow channel and the transition channel; when the sealing portion rises and the vertical flow channel is connected to the sealing cavity, the fluid entering the sealing cavity from the first flow channel and the transition channel can pass through the vertical flow channel and the second flow channel and flow out from the outlet end of the second flow channel; when the sealing portion descends and the vertical flow channel is isolated from the sealing cavity, the fluid entering the sealing cavity from the first flow channel and the transition channel is prevented from entering the vertical flow channel and the second flow channel.

[0005] The sealing cover comprises a magnet, a mold sheet, a fixing column, a valve cover and a sealing ring, wherein the mold sheet can be attracted by the magnetic force of the magnet; the magnet is fixedly connected to the valve cover, and the mold sheet is fixedly sleeved on the outer peripheral wall of the fixing column; the top end of the fixing column passes through the center of the magnet, and the bottom end of the fixing column is connected to the sealing part; the fixing column can drive the mold sheet and the sealing part to move up and down together; when the fixing column moves upward, the mold sheet is sucked onto the lower surface of the magnet, and at the same time the sealing part is raised to connect the vertical flow channel with the sealing cavity; when the fixing column moves downward, the mold sheet is separated from the magnet, and at the same time the sealing part is lowered to separate the vertical flow channel from the sealing cavity.

[0006] A shrinking groove is provided on the outer peripheral wall of the valve body, and the edge of the valve cover is clamped in the shrinking groove to achieve relative fixation of the valve cover and the valve body; the top of the fixing column is fixedly connected to the plastic handwheel by a flat head screw; the bottom of the fixing column is provided with a hollow groove, and a circumferential flange is provided around the hollow groove, and the top of the sealing part is provided with an annular groove, and the circumferential flange is clamped in the annular groove to achieve fixed connection between the fixing column and the sealing part.

[0007] The sealing ring comprises a diaphragm and a sealing droop, wherein the sealing droop is annular and extends downward from the edge of the diaphragm; the diaphragm is fixedly connected with the sealing part.

[0008] The central axis of the valve cover is perpendicular to the central axis of the valve stem.

[0009] An O-ring is sleeved on the outer peripheral wall of the valve stem, and the O-ring is arranged between the outer peripheral wall of the valve stem and the inner peripheral wall of the protruding tube. The O-ring seals the gap between the outer peripheral wall of the valve stem and the inner peripheral wall of the protruding tube.

[0010] The handle and the valve stem are connected via a cross screw.

[0011] A spring washer is arranged between the cross screw and the top end of the valve stem.

[0012] A cap is arranged on the top of the cross screw.

[0013] A plurality of stepped flow channels communicating with each other are arranged between the inlet end and the outlet end of the second flow passage.

[0014] Beneficial Effects

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The pipeline gas self-closing valve of the present invention improves the rubber gasket seal of the plane structure in the prior art into a hard seal of a spherical or conical structure, which greatly improves the fireproof performance and sealing performance of the pipeline gas self-closing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the specific implementation methods of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0017] Figure 1 It is a schematic diagram of the assembly structure of the pipeline gas self-closing valve of the present invention.

[0018] Figure 2 It is a schematic diagram of the sealing cover structure of the pipeline gas self-closing valve of the present invention. DETAILED DESCRIPTION

[0019] The present invention is described in more detail hereinafter to facilitate understanding of the present invention.

[0020] like Figure 1 to Figure 2 As shown, the pipeline gas self-closing valve of the present invention comprises a valve cover 1, a valve ball 2, a sealing ring 3, a valve stem 4, a handle 6, a sealing cover 10 and a valve body 11. The valve body 11 is a horizontal tubular member, and a first flow passage 113 and a second flow passage 123 are arranged in the horizontal axis direction of the valve body 11; an inlet 1131 is arranged at one end of the first flow passage 113, and an outlet 1132 is arranged at the other end; the valve cover 1 is fixedly installed at the inlet of the first flow passage 113, and a valve cover channel 115 is arranged in the central axis direction of the valve cover 1, and the valve cover channel 115 is communicated with the first flow passage 113, so that the inlet 1131 of the valve cover channel 115 is opened. 1 is connected to the first flow passage 113; the valve ball 2 is rotatably arranged in the first flow passage 113, and the sealing ring 3 is arranged at the position where the outer peripheral wall of the valve ball contacts the inner wall of the first flow passage; a protruding tube 114 extending in a direction perpendicular to the central axis of the first flow passage is arranged on the outer peripheral wall of the first flow passage 113, and a valve stem passage 114 is arranged at the center of the protruding tube; the valve stem 4 is vertically arranged in the valve stem passage; one end of the valve stem 4 is fixedly installed on the top of the valve ball, and the other end of the valve stem is fixedly connected to the handle 6, and the valve stem and the valve ball are driven to rotate by rotating the handle; the valve ball is provided with a valve stem extending along the valve stem passage. The through hole extends to the diameter of the ball, and when the valve ball is rotated, the through hole is changed between a conductive state connected to the first flow channel 113 and a blocked state blocked from the first flow channel 113; the inlet end 42 of the second flow channel 123 is connected to the vertical flow channel 30; the central axis of the vertical flow channel is perpendicular to the central axis of the second flow channel; a sealed cavity 43 is formed between the sealing cover 10 and the vertical flow channel 30; the first flow channel 113 and the sealed cavity 43 are connected through a transition channel 41; a spherical or conical sealing portion 28 is provided on the top of the vertical flow channel 30, and the spherical or conical sealing portion The sealing part adopts a hard seal; the sealing part 28 can rise or fall in response to the pressure of the fluid entering the sealed cavity 43 from the first flow channel 113 and the transition channel 41; when the sealing part rises and the vertical flow channel 30 is connected with the sealed cavity 43, the fluid entering the sealed cavity 43 from the first flow channel 113 and the transition channel 41 can pass through the vertical flow channel 30 and the second flow channel 123 and flow out from the outlet end 112 of the second flow channel; when the sealing part descends and the vertical flow channel 30 is separated from the sealed cavity 43, the fluid entering the sealed cavity 43 from the first flow channel 113 and the transition channel 41 is prevented from entering the vertical flow channel 30 and the second flow channel 123.

[0021] The sealing cover 10 includes a magnet 23, a sheet 24, a fixing column 25, a valve cover 26 and a sealing ring 27, wherein the sheet can be attracted by the magnetic force of the magnet 23; the magnet is fixedly connected to the valve cover, and the sheet is fixedly sleeved on the outer peripheral wall of the fixing column; the top end of the fixing column passes through the center of the magnet, and the bottom end of the fixing column is connected to the sealing portion 28; the fixing column can drive the sheet and the sealing portion 28 to move up and down together; when the fixing column moves upward, the sheet is sucked onto the lower surface of the magnet, and at the same time the sealing portion rises to connect the vertical flow channel 30 with the sealing cavity 43; when the fixing column moves downward, the sheet is separated from the magnet, and at the same time the sealing portion descends to separate the vertical flow channel 30 from the sealing cavity 43.

[0022] The outer peripheral wall of the valve body 11 is provided with a shrinking groove 12, and the edge of the valve cover 26 is stuck in the shrinking groove to achieve relative fixation of the valve cover and the valve body; the top of the fixing column 25 is fixedly connected to the plastic handwheel 22 by a flat head screw 21; the bottom of the fixing column 25 is provided with a hollow groove 33, and a circumferential flange 32 is provided around the hollow groove. The top of the sealing part 28 is provided with an annular groove 31, and the circumferential flange is stuck in the annular groove to achieve fixed connection between the fixing column and the sealing part.

[0023] The sealing ring 27 includes a diaphragm 34 and a sealing rim 35 . The sealing rim is annular and extends downward from the edge of the diaphragm. The diaphragm is fixedly connected to the sealing portion 28 .

[0024] The central axis of the valve cover 1 is perpendicular to the central axis of the valve stem 4 .

[0025] An O-ring 5 is sleeved on the outer circumferential wall of the valve stem 4 , and the O-ring 5 is arranged between the outer circumferential wall of the valve stem 4 and the inner circumferential wall of the protruding tube 114 . The O-ring 5 seals the gap between the outer circumferential wall of the valve stem 4 and the inner circumferential wall of the protruding tube 114 .

[0026] The handle 6 and the valve stem are connected via a cross screw 8 .

[0027] A spring washer 7 is arranged between the cross screw and the top end of the valve stem.

[0028] A cap 9 is provided on the top of the cross screw.

[0029] A plurality of stepped flow channels that are interconnected are disposed between the inlet end 42 and the outlet end 112 of the second flow passage 123 .

[0030] When the pipeline gas self-closing valve of the present invention is used, the inlet 111 of the valve cover channel 115 and the outlet end 112 of the second flow channel are connected to the gas pipeline respectively, and the handle 6 is rotated to drive the valve stem 4 and the valve ball 2 to rotate; when the valve ball 2 is rotated, the through hole on the valve ball is rotated to a conductive state with the first flow channel 113, and the gas in the gas pipeline enters the sealing cavity 43 through the inlet 111, the valve cover channel 115, the through hole on the valve ball, the first flow channel 113, and the transition channel 41. The plastic hand wheel 22 is lifted upward, and the plastic hand wheel 22 drives the fixing column 25 to move upward together, and the fixing column 25 drives the mold piece 24 and the sealing part 28 to move upward together; the mold piece 24 is sucked onto the lower surface of the magnet 23, and at the same time, the sealing part is raised to connect the vertical flow channel 30 with the sealing cavity 43; the gas entering the sealing cavity 43 can pass through the vertical flow channel 30 and the second flow channel 123 and flow out from the outlet end 112 of the second flow channel.

[0031] When the gas pressure in the sealed cavity 43 is low, the magnetic attraction of the magnet 23 to the sheet 24 cannot be overcome, so the sheet 24 is always attracted to the lower surface of the magnet 23, and the sealing portion 28 is separated from the top of the vertical flow channel 30, so that the vertical flow channel 30 is connected to the sealed cavity 43; at this time, the gas can always pass through the vertical flow channel 30 and the second flow channel 123 and flow out from the outlet end 112 of the second flow channel.

[0032] When the gas pressure in the sealing chamber 43 increases, the downward force of the gas on the diaphragm 34 increases. When the downward force of the gas on the diaphragm 34 is balanced with the upward magnetic attraction of the magnet 23 on the sheet 24, if the gas pressure in the sealing chamber 43 continues to increase, the downward force of the gas on the diaphragm 34 is greater than the upward magnetic attraction of the magnet 23 on the sheet 24. At this time, the diaphragm 34 drives the sealing part 28 to move downward. Since the sealing part 28 is fixedly connected to the fixed column, the sheet 24 is fixedly sleeved on the outer peripheral wall of the fixed column 25. The sealing part 28 drives the fixed column and the sheet to move downward together, and the sheet is separated from the magnet 23 until the sealing part 28 seals the top of the vertical flow channel 30. Since the outer shape of the sealing part 28 of the present invention is a spherical or conical surface ( Figure 2 The sealing portion 28 shown is a spherical surface with a diameter of R). Different from the rubber gasket seal used in the prior art, the sealing portion 28 of the present invention adopts a hard seal, which greatly improves the fireproof performance and sealing performance of the pipeline gas self-closing valve. After the sealing portion 28 seals the top of the vertical flow channel 30, the gas cannot enter the vertical flow channel 30 and the second flow channel 123 until the gas pressure is reduced to the point where the magnet 23 can attract the mold piece 24 to the bottom of the magnet.

[0033] The above describes the preferred embodiments of the present invention, but it is not intended to limit the present invention. Those skilled in the art may make improvements and changes to the embodiments disclosed herein without departing from the scope and spirit of the present invention.

Claims

1. A pipeline gas self-closing valve, characterized in that: The utility model comprises a valve cover, a valve ball, a sealing ring, a valve stem, a handle, a sealing cover and a valve body. The valve body is a horizontal tubular member. A first flow passage and a second flow passage are arranged in the horizontal axis direction of the valve body. An inlet is arranged at one end of the first flow passage, and an outlet is arranged at the other end. The valve cover is fixedly installed at the inlet of the first flow passage. A valve cover channel is arranged in the central axis direction of the valve cover. The valve cover channel is connected with the first flow passage, so that the inlet of the valve cover channel is connected with the first flow passage. The valve ball is rotatably arranged in the first In the flow passage, the sealing ring is arranged at the position where the outer peripheral wall of the valve ball contacts the inner wall of the first flow passage; a protruding tube extending in a direction perpendicular to the central axis of the first flow passage is arranged on the outer peripheral wall of the first flow passage, and a valve stem passage is arranged at the center of the protruding tube; the valve stem is vertically arranged in the valve stem passage; one end of the valve stem is fixedly mounted on the top of the valve ball, and the other end of the valve stem is fixedly connected to the handle, and the valve stem and the valve ball are driven to rotate by rotating the handle; the valve ball is provided with a protruding tube extending along the diameter of the valve ball The through hole is connected to the first flow channel and the isolation state is blocked from the first flow channel when the valve ball is rotated; the inlet end of the second flow channel is connected to the vertical flow channel; the central axis of the vertical flow channel is perpendicular to the central axis of the second flow channel; a sealed cavity is formed between the sealing cover and the vertical flow channel; the first flow channel and the sealed cavity are connected through a transition channel; a spherical or conical sealing part is provided on the top of the vertical flow channel, and the spherical or conical sealing part adopts a hard seal; the sealing part can rise or fall in response to the pressure of the fluid entering the sealed cavity from the first flow channel and the transition channel; when the sealing part rises and the vertical flow channel is connected to the sealed cavity, the fluid entering the sealed cavity from the first flow channel and the transition channel can pass through the vertical flow channel and the second flow channel and flow out from the outlet end of the second flow channel; when the sealing part descends and the vertical flow channel is isolated from the sealed cavity, the fluid entering the sealed cavity from the first flow channel and the transition channel is prevented from entering the vertical flow channel and the second flow channel; The sealing cover comprises a magnet, a sheet, a fixing column, a valve cover and a sealing ring, wherein the sheet can be attracted by the magnetic force of the magnet; the magnet is fixedly connected to the valve cover, and the sheet is fixedly sleeved on the outer peripheral wall of the fixing column; the top end of the fixing column passes through the center of the magnet, and the bottom end of the fixing column is connected to the sealing part; the fixing column can drive the sheet and the sealing part to move up and down together; when the fixing column moves upward, the sheet is sucked onto the lower surface of the magnet, and the sealing part is raised to connect the vertical flow channel with the sealing cavity; when the fixing column moves downward, the sheet is separated from the magnet, and the sealing part is lowered to separate the vertical flow channel from the sealing cavity; The outer peripheral wall of the valve body is provided with a shrinking groove, and the edge of the valve cover is clamped in the shrinking groove to achieve relative fixation of the valve cover and the valve body; the top of the fixing column is fixedly connected to the plastic handwheel by a flat head screw; the bottom of the fixing column is provided with a hollow groove, and a circumferential flange is provided around the hollow groove. The top of the sealing part is provided with an annular groove, and the circumferential flange is clamped in the annular groove to achieve fixed connection between the fixing column and the sealing part; The central axis of the valve cover is perpendicular to the central axis of the valve stem; An O-ring is sleeved on the outer peripheral wall of the valve stem and arranged between the outer peripheral wall of the valve stem and the inner peripheral wall of the protruding tube. The O-ring seals the gap between the outer peripheral wall of the valve stem and the inner peripheral wall of the protruding tube.

2. The pipeline gas self-closing valve according to claim 1, characterized in that: The sealing ring comprises a diaphragm and a sealing droop, wherein the sealing droop is annular and extends downward from the edge of the diaphragm; the diaphragm is fixedly connected with the sealing part.

3. The pipeline gas self-closing valve according to claim 1, characterized in that: The handle and the valve stem are connected via a cross screw.

4. The pipeline gas self-closing valve according to claim 3, characterized in that: A spring washer is arranged between the cross screw and the top end of the valve stem.

5. The pipeline gas self-closing valve according to claim 3, characterized in that: A cap is arranged on the top of the cross screw.

6. The pipeline gas self-closing valve according to claim 1, characterized in that: A plurality of stepped flow channels communicating with each other are arranged between the inlet end and the outlet end of the second flow passage.

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