CN221196161U - Pneumatic bidirectional reusable pinch valve device - Google Patents

Abstract

A pneumatic bidirectional reusable pinch valve device, wherein a valve cavity is arranged in a valve body, a rubber sleeve is assembled in the valve cavity, and an annular air cavity is arranged at the outer side of the rubber sleeve; the air storage chamber is arranged in the air storage cylinder and is supported above the valve body; the main body section of the composite communication pipeline is positioned in the air storage chamber, the upper end of the main body section is connected with the lower end plate of the piston cylinder arranged at the top of the air storage cylinder body, and the lower end of the main body section penetrates out of the air storage cylinder body and is communicated with the annular air cavity; the center of the lower end plate is provided with an air passing hole, and the periphery of the lower end plate is provided with a plurality of air holes; the piston is arranged in the piston cylinder in a sliding way; the upper end and the lower end of the return spring are respectively connected with the upper end plate of the piston cylinder and the upper end of the piston; the air inlet pressure regulating valve is arranged on the outer side of the air storage cylinder body, and a valve port P of the air inlet pressure regulating valve is communicated with an air inlet B on the upper end plate of the piston cylinder through a communication pipeline; the exhaust valve is arranged at the center of the bottom of the valve body and is communicated with the annular air cavity. The pinch valve device has high reliability and quick response, and can effectively isolate the propagation of pressure, shock wave, flame and the like generated in explosion in a pipeline.

Description

Pneumatic bidirectional reusable pinch valve device

Technical Field

The invention belongs to the technical field of explosion-proof protection, and particularly relates to a pneumatic bidirectional reusable pinch valve device.

Background

With the rapid development of modern industry, production safety becomes the first production task. In the dust industry, a dust explosion event poses a great threat to the safety production of enterprises, so that an effective explosion-proof technology is required to be adopted to ensure the safety production work of dust. At present, the main mode of explosion suppression in dust production is to install an explosion suppression device at the upstream of an explosion-possible area, wherein the pinch valve is a common explosion suppression device due to the advantage of reusability. The pinch valve is an active explosion isolation device, can realize the effect of isolating explosion on a pipeline, and can close an internal channel when the explosion occurs, so that the pressure, the shock wave, the flame and the like generated in the explosion can be effectively isolated from spreading in the pipeline, the explosion is isolated in a certain area, the upstream related equipment is effectively protected from the impact of the shock wave and the flame, and the harm of the explosion to operators is reduced. After the danger is removed, the internal channel of the pinch valve can be restored to the original state, and then the two sections of pipelines are communicated again, so that the normal production work can be restored.

Some prior pinch valve devices have unsatisfactory reliability, and meanwhile, the gas path stroke is longer, the response time is slower, and the effect of isolating explosion pressure wave and flame can not be achieved in the first time after explosion occurs. Accordingly, there is a need to provide a pinch valve device that is fast in response and highly reliable.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a pneumatic bidirectional reusable pinch valve device, which has the advantages of simple structure, convenient maintenance process, low manufacturing cost, high reliability and quick response, can meet the explosion-proof requirements of an upstream pipeline and a downstream pipeline of a dust collecting system, and can effectively isolate the propagation of pressure, shock wave, flame and the like generated in explosion in the pipeline.

The invention provides a pneumatic bidirectional reusable pinch valve device, which comprises a valve body and a rubber sleeve; the device is characterized by further comprising a cylinder storage block, a piston cylinder, a piston, a return spring, a composite communication pipeline, an air inlet pressure regulating valve and an exhaust valve;

A valve cavity is arranged in the valve body; the rubber sleeve is assembled in the valve cavity, and an annular air cavity is arranged between the rubber sleeve and the valve body; an air inlet hole A communicated with the annular air cavity is formed in the top of the valve body, and an air outlet hole A communicated with the annular air cavity is formed in the bottom of the valve body;

The air storage chamber is arranged in the air storage cylinder body, and the air storage cylinder body is supported and arranged right above the valve body through a right-angle support; the top center of the air storage cylinder body is provided with a cylinder body mounting hole, and the bottom center of the air storage cylinder body is provided with a pipe body outlet hole;

The composite communication pipeline is vertically arranged, the main body section of the composite communication pipeline is positioned in the air storage chamber, the upper end of the composite communication pipeline is positioned under the mounting hole of the cylinder body, the lower part of the composite communication pipeline is inserted into the pipe body outlet hole and is in sealing connection with the pipe body outlet hole, and the lower end of the composite communication pipeline extends to the outer side of the air storage cylinder body and is fixedly inserted into the air inlet hole A;

The piston cylinder is fixedly arranged in the cylinder body mounting hole and is in sealing connection with the cylinder body mounting hole; the upper end plate of the piston cylinder is positioned at the outer side of the air storage cylinder body, an air inlet hole B is formed in the central area of the upper end plate, the lower end plate of the piston cylinder is positioned in the air storage chamber, the lower end face of the lower end plate is fixedly connected with the upper end of the composite communication pipeline, an air passing hole is formed in the part of the lower end plate at the inner side of the upper end of the composite communication pipeline, and a plurality of air holes are formed in the part of the outer side of the upper end of the composite communication pipeline;

The piston is assembled in the piston cylinder in a sliding and sealing manner;

The reset spring is arranged in the piston cylinder and is positioned at the upper part of the piston, the upper end of the reset spring is connected with the upper end plate, and the lower end of the reset spring is connected with the upper end of the piston;

The air inlet pressure regulating valve is arranged at the outer side of the air storage cylinder body and is provided with a valve port P, a valve port A and a valve port B, the valve port P is connected with the air inlet B through a communication pipeline, the valve port A is connected with a connecting port formed on the air storage cylinder body through a pipeline and is communicated with the air storage chamber through the connecting port, and the valve port B is communicated with the outside atmosphere; the air inlet pressure regulating valve is a reversing valve, one working position of the air inlet pressure regulating valve is in a state that a valve port P is communicated with a valve port A, and the other working position of the air inlet pressure regulating valve is in a state that the valve port P is communicated with a valve port B;

The exhaust valve is arranged outside the valve body, and an air inlet pipeline of the exhaust valve is fixedly inserted into an exhaust hole A of the valve body.

Furthermore, in order to keep the pressure in the gas storage chamber within a safe pressure range, and simultaneously, in order to facilitate visual display of the air pressure in the gas storage chamber, the device also comprises a pressure release valve and a pressure gauge; the pressure release valve is arranged on one side of the outer part of the air storage cylinder body, and an air inlet pipeline of the pressure release valve is fixedly inserted into a pressure release opening formed in the air storage cylinder body and is communicated with the air storage chamber through the pressure release opening; the pressure gauge is arranged on one side of the outer part of the air storage body, and an air inlet pipeline of the pressure gauge is fixedly inserted into a detection port formed in the air storage body and communicated with the air storage chamber through the detection port, so that the gas pressure in the air storage chamber is monitored in real time.

Further, in order to facilitate the connection between the pipe bodies, the composite communicating pipe is composed of a straight connector, a connecting sleeve, an upper connecting pipe, a lower connecting pipe and a connecting pipe; the lower end of the straight connector is fixedly inserted into the air inlet hole A; the connecting sleeve is arranged in the middle of the air storage chamber, and an upper pipe body mounting hole and a lower pipe body mounting hole which are mutually communicated are oppositely formed in the upper part and the lower part of the connecting sleeve; the upper connecting pipe is vertically arranged, the lower end of the upper connecting pipe is fixedly inserted into the upper pipe body mounting hole in a sealing way, and the upper end of the upper connecting pipe is connected with the lower end plate; the lower connecting pipe is vertically arranged, the upper end of the lower connecting pipe is fixedly inserted into the lower pipe body mounting hole in a sealing manner, and the lower end of the lower connecting pipe extends to the outer side of the air storage cylinder body through the pipe body outlet hole and is fixedly inserted into the upper end of the straight connecting head in a sealing manner; the lower connecting pipe is connected with the pipe body outlet in a sealing way. The upper pipe body mounting hole and the lower pipe body mounting hole are oppositely formed in the upper portion and the lower portion of the connecting sleeve, so that the upper connecting pipe and the lower connecting pipe can be connected together coaxially, and meanwhile, the lower connecting pipe can be conveniently penetrated out from a pipe body outlet formed in the air storage cylinder body. The lower end of the lower connecting pipe body is externally connected with the straight connector, and the lower end of the straight connector is inserted into the air inlet A on the valve body, so that a communication passage between the lower connecting pipe and the annular air cavity can be conveniently established.

Further, in order to facilitate the reliable connection of the pinch valve device between two sections of pipes, the pinch valve device further comprises a pair of flanges which are correspondingly and fixedly connected at a pair of mounting holes at two ends of the valve body, and meanwhile, two ends of the rubber sleeve are pressed and fixed at two ends of the valve body.

Preferably, the air inlet pressure regulating valve is a two-position three-way electromagnetic reversing valve, which works in a right position in a non-power-on state, wherein the valve port P and the valve port A are in a communicated state, and works in a left position in a power-on state, and the valve port P and the valve port B are in a communicated state.

Further, in order to facilitate the automatic control of the opening and closing actions of the valve body, the automatic control valve further comprises a controller and one or two detectors, wherein when the number of the detectors is two, the two detectors are respectively arranged on two sections of pipelines on two sides of the valve body, and when the number of the detectors is one, the detectors are arranged on one section of pipeline on one side of the valve body; the input end of the controller is connected with the detector, and the output end of the controller is respectively connected with the air inlet pressure regulating valve and the exhaust valve. When the detector detects that an explosion signal exists on the corresponding side pipeline, the explosion signal is sent to the controller in real time, the controller rapidly controls the air inlet pressure regulating valve to be electrified after receiving the explosion signal, the valve port P and the valve port B of the air inlet pressure regulating valve are mutually communicated after the air inlet pressure regulating valve is electrified, and then the communication pipeline is communicated with the outside atmosphere. When the detectors are arranged on the two sections of pipelines, the bidirectional explosion-proof effect on the pipelines can be realized, the upstream and downstream of the pipelines can be isolated at the same time, and the propagation of explosion on any side can be effectively prevented.

Preferably, the detector is a pressure sensor.

Further, in order to avoid the situation that the rubber sleeve generates pressure damage in the long-term use process, the inner diameter of the rubber sleeve is the same as the inner diameters of the two sections of pipelines at the two sides of the valve body.

Preferably, the controller is a PLC controller.

According to the utility model, the air storage cylinder body is supported above the valve body, so that pressure air can be conveniently filled into the air storage chamber in the air storage cylinder body, and the air storage chamber can be provided by the pinch valve device, so that a high-pressure air source can be conveniently used as a power source for opening and closing the valve body, and the quick closing action of the valve body can be conveniently realized by using a short air path. The center of the lower end plate of the piston cylinder is provided with an air passing hole communicated with the composite communication pipeline, and meanwhile, the periphery of the lower end plate is provided with a plurality of air holes communicated with the air storage chamber, so that the lower cavity of the piston cylinder can be a communication air chamber communicated with the air storage chamber and the composite communication pipeline, and meanwhile, a piston arranged in the piston cylinder in a sliding manner can be used as an on-off control part of the air passing communication air chamber. The main body section of the vertically arranged composite communication pipeline is arranged in the air storage chamber, the upper end of the main body section is communicated with the lower cavity of the piston cylinder through the air passing hole on the lower end plate, and the lower end of the main body section is communicated with the annular air cavity through the air inlet A on the valve body, so that a passage among the air storage chamber, the lower cavity of the piston cylinder, the composite communication pipeline and the annular air cavity is established, when the piston leaves the lower end plate, the high-pressure air in the air storage chamber can be ensured to enter the annular air cavity through the lower cavity of the piston cylinder and the composite communication pipeline, thereby the central area of the rubber sleeve can be extruded, the rubber sleeve can be rapidly closed, the communication state between the two sections of pipelines can be effectively isolated after the rubber sleeve is closed, the purpose of flame proof is achieved, in addition, when the piston moves to a state of being attached to the lower end plate, a passage between the composite communication pipeline and the air storage chamber is disconnected, so that the rubber sleeve can be ensured to be in a communicated state in a normal state, furthermore, the arrangement mode can ensure that the air passage stroke for controlling the closing action of the rubber sleeve is short, the rubber sleeve can be ensured to be in a closed state within tens of milliseconds, and the response speed is effectively improved. The valve port P of the air inlet pressure regulating valve is communicated with the air inlet hole B in the center of the upper end plate of the piston cylinder through a communication pipeline, and the valve port A is communicated with the air storage chamber through a connecting port on the air storage cylinder body, so that part of pressure air in the air storage chamber can be guided into the upper cavity of the piston cylinder through a passage between the valve port A and the valve port P, and meanwhile, a return spring is arranged above the piston in the piston cylinder, so that the air pressure in the air storage chamber is matched with the elasticity of the return spring to jointly act on the upper end surface of the piston, the air pressure of the lower cavity of the piston cylinder can be effectively overcome, the piston can be tightly attached to the lower end plate in a normal state, and the normal communication state of the pinch valve can be ensured. the center of the bottom of the valve body is provided with the exhaust port A communicated with the waist of the valve cavity, and the exhaust valve A is connected with the exhaust port A, so that the annular air cavity is conveniently in a closed state or is communicated with the outside atmosphere through the control of the exhaust valve, when the valve is in the closed state, the high-pressure air in the air storage chamber can be ensured to be more efficiently acted on the middle part of the rubber sleeve, the rubber sleeve can be more rapidly converted into the closed state, meanwhile, the duration of the closed state can be ensured, when the valve is in the state of being communicated with the outside atmosphere, the air pressure in the annular air cavity is the same as the outside air pressure, the rubber sleeve is further in the communicated state, and the maintenance of a connecting passage between two sections of pipelines is ensured. The pipe clamping valve device has the advantages of simple structure, convenient maintenance process, low manufacturing cost, high reliability and quick response, can meet the explosion isolation requirements of the upstream and downstream pipelines of the dust collection system, and can effectively isolate the propagation of pressure, shock waves, flame and the like generated in explosion in the pipelines.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a side view of the present utility model;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged view of a portion A of FIG. 3;

FIG. 5 is an enlarged view of part B of FIG. 3;

FIG. 6 is a schematic diagram of the assembly between the composite communication line and the piston cylinder in the present utility model;

fig. 7 is a cross-sectional view A-A of fig. 2.

In the figure: 1. the valve body, 2, the rubber sleeve, 3, the air inlet pressure regulating valve, 4, the gas storage cylinder body, 5, the connecting sleeve, 6, the piston cylinder, 7, the piston, 8, the relief valve, 9, the manometer, 10, the valve cavity, 11, the upper connecting pipe, 12, the lower connecting pipe, 13, the discharge valve, 14, the right angle support, 15, the gas storage chamber, 16, the flange, 17, the exhaust hole A,18, the inlet hole A,19, the communication pipeline, 20, the compound communication pipeline, 21, the lower end plate, 22, the vent hole, 23, the upper end plate, 24, the annular air cavity, 25, the return spring, 26, the straight connector, 27, the barrel installation hole, 28, the body outlet hole, 29, the inlet hole B.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 to 7, the present invention provides a pneumatic bi-directional reusable pinch valve apparatus comprising a valve body 1 and a rubber sleeve 2; the device is characterized by further comprising a cylinder storage block 4, a piston cylinder 6, a piston 7, a return spring 25, a compound communication pipeline 20, an air inlet pressure regulating valve 3 and an exhaust valve 13;

The center of the valve body 1 is provided with a valve cavity 10 which transversely extends, two ends of the valve cavity 10 respectively extend to two opposite end surfaces of the valve body 1, and two mounting openings are respectively formed on the two opposite end surfaces of the valve body 1; the valve cavity 10 is in a drum-shaped structure with the waist bulge outwards than the two ends of the valve cavity;

The outer diameter of the rubber sleeve 2 is matched with the inner diameters of two mounting openings on the valve body 1, the rubber sleeve 2 is coaxially arranged in the valve cavity 10, two ends of the rubber sleeve 2 are respectively in fit sealing connection with the edges of the two mounting openings, and a sealed annular air cavity 24 is formed between the rubber sleeve 2 and the waist of the valve cavity 10; an air inlet hole A18 communicated with the annular air cavity 24 is formed in the center of the top of the valve body 1, and an air outlet hole A17 communicated with the annular air cavity 24 is formed in the center of the bottom of the valve body 1;

the air storage chamber 15 is arranged in the air storage cylinder body 4, and the air storage cylinder body 4 is supported right above the valve body 1 through the right-angle support 14; the top center of the air storage cylinder body 4 is provided with a cylinder body mounting hole 27, and the bottom center of the air storage cylinder body is provided with a pipe body outlet hole 28; as one preferable, the cylinder mounting hole 27, the pipe body outlet hole 28, and the air intake hole a18 are coaxially arranged in the vertical direction;

The composite communication pipeline 20 is vertically arranged, the main body section of the composite communication pipeline is positioned in the air storage chamber 15, the upper end of the composite communication pipeline is positioned right below the cylinder mounting hole 27, the lower part of the composite communication pipeline is inserted into the pipe body outlet hole 28 and is in sealing connection with the pipe body outlet hole 28, and the lower end of the composite communication pipeline extends to the outer side of the air storage cylinder body 4 and is fixedly inserted into the air inlet hole A18;

The piston cylinder 6 is fixedly arranged in the cylinder mounting hole 27 and is in sealing connection with the cylinder mounting hole 27; the upper end plate 23 of the piston cylinder 6 is positioned at the outer side of the air storage cylinder body 4, an air inlet hole B29 is formed in the central area of the upper end plate 23, the lower end plate 21 of the piston cylinder 6 is positioned in the air storage chamber 15, the lower end surface of the lower end plate 21 is fixedly connected with the upper end of the composite communication pipeline 20, the lower end plate 21 is provided with an air passing hole at the inner side of the upper end of the composite communication pipeline 20, and a plurality of air holes 22 are uniformly formed in the circumferential direction of the outer side of the upper end of the composite communication pipeline 20;

The size of the outer diameter of the piston 7 is matched with the size of the inner diameter of the piston cylinder 6, the piston 7 is assembled in the piston cylinder 6 in a sliding sealing way, and the piston 7 is used for opening or closing the air passing hole;

The return spring 25 is arranged in the piston cylinder 6 and is positioned at the upper part of the piston 7, the upper end of the return spring 25 is connected with the upper end plate 23, and the lower end of the return spring 25 is connected with the upper end of the piston 7 and is used for providing a return elastic force for downward return to the piston 7;

the air inlet pressure regulating valve 3 is arranged on the outer side of the air storage cylinder body 4 and is provided with a valve port P, a valve port A and a valve port B, the valve port P is connected with an air inlet hole B29 through a communication pipeline 19, the valve port A is connected with a connecting port formed on the air storage cylinder body 4 through a pipeline and is communicated with the air storage chamber 15 through the connecting port, and the valve port B is communicated with the external atmosphere; the air inlet pressure regulating valve 3 is a reversing valve, one working position of the air inlet pressure regulating valve is in a state that a valve port P is communicated with a valve port A, and the other working position of the air inlet pressure regulating valve is in a state that the valve port P is communicated with a valve port B;

The exhaust valve 13 is installed outside the valve body 1, and an air inlet pipeline of the exhaust valve is fixedly inserted into an exhaust hole A17 of the valve body 1. Preferably, the exhaust valve 13 is an electrically controlled valve, which is normally closed in the unpowered state and normally open in the powered state.

In order to keep the pressure in the gas storage chamber within a safe pressure range, and simultaneously, in order to facilitate visual display of the air pressure in the gas storage chamber, the gas storage device also comprises a pressure release valve 8 and a pressure gauge 9; the pressure release valve 8 is arranged on one side of the outer part of the air storage cylinder body 4, and an air inlet pipeline of the pressure release valve is fixedly inserted into a pressure release opening formed in the air storage cylinder body 4 and is communicated with the air storage chamber 15 through the pressure release opening; the pressure gauge 9 is installed on one side outside the air storage body 4, and an air inlet pipeline of the pressure gauge is fixedly inserted into a detection port formed in the air storage body 4 and is communicated with the air storage chamber 15 through the detection port, so that the gas pressure in the air storage chamber 15 is monitored in real time.

In order to facilitate the connection between the pipe bodies, the composite communication pipeline 20 is composed of a straight connector 26, a connecting sleeve 5, an upper connecting pipe 11, a lower connecting pipe 12 and a connecting pipe; the lower end of the straight connector 26 is fixedly inserted into the air inlet hole A18 and is communicated with the annular air cavity 24 through the air inlet hole A18; the connecting sleeve 5 is arranged in the middle of the air storage chamber 15, and an upper pipe body mounting hole and a lower pipe body mounting hole which are mutually communicated are oppositely formed in the upper part and the lower part of the connecting sleeve; the upper connecting pipe 11 is vertically arranged, the lower end of the upper connecting pipe is fixedly inserted into the upper pipe body mounting hole in a sealing way, and the upper end of the upper connecting pipe is connected with the lower end plate 21; the lower connecting pipe 12 is vertically arranged, the upper end of the lower connecting pipe is fixedly inserted into the lower pipe body mounting hole in a sealing way, the lower end of the lower connecting pipe extends to the outer side of the air storage cylinder body 4 through the pipe body outlet hole 28, and is fixedly inserted into the upper end of the straight connecting head 26 in a sealing way; the lower connecting pipe 12 is connected with the pipe body outlet hole 28 in a sealing way. The upper pipe body mounting hole and the lower pipe body mounting hole are oppositely formed in the upper portion and the lower portion of the connecting sleeve, so that the upper connecting pipe and the lower connecting pipe can be connected together coaxially, and meanwhile, the lower connecting pipe can be conveniently penetrated out from a pipe body outlet formed in the air storage cylinder body. The lower end of the lower connecting pipe body is externally connected with the straight connector, and the lower end of the straight connector is inserted into the air inlet A on the valve body, so that a communication passage between the lower connecting pipe and the annular air cavity can be conveniently established.

In order to facilitate reliable connection of the pinch valve device between two sections of pipe, the pinch valve device further comprises a pair of flanges 16, wherein the size of the pair of flanges 16 is matched with the size of the pair of mounting holes, the pair of flanges are correspondingly and fixedly connected to the pair of mounting holes, and meanwhile, two ends of the rubber sleeve 2 are pressed and fixed at two ends of the valve body 1. Preferably, the flange 16 is fixedly connected with the mounting opening on the corresponding side through a connecting bolt.

The air inlet pressure regulating valve 3 is a two-position three-way electromagnetic reversing valve, which works in the right position in the state of no power supply, the valve port P and the valve port A are in the state of communication, and works in the left position in the state of power supply, and the valve port P and the valve port B are in the state of communication.

In order to facilitate the automatic control of the opening and closing actions of the valve body, the device also comprises a controller and two detectors, wherein when the number of the detectors is two, the two detectors are respectively arranged on two sections of pipelines at two sides of the valve body 1, and when the number of the detectors is one, the detectors are arranged on one section of pipeline at one side of the valve body 1; the input end of the controller is connected with the detector, and the output end of the controller is respectively connected with the air inlet pressure regulating valve 3 and the exhaust valve 13. When the detector detects that an explosion signal exists on the corresponding side pipeline, the explosion signal is sent to the controller in real time, the controller rapidly controls the air inlet pressure regulating valve to be electrified after receiving the explosion signal, the valve port P and the valve port B of the air inlet pressure regulating valve are mutually communicated after the air inlet pressure regulating valve is electrified, and then the communication pipeline is communicated with the outside atmosphere. When the detectors are arranged on the two sections of pipelines, the bidirectional explosion-proof effect on the pipelines can be realized, the upstream and downstream of the pipelines can be isolated at the same time, and the propagation of explosion on any side can be effectively prevented.

Preferably, the detector is a pressure sensor.

In order to avoid the situation that the rubber sleeve is damaged by pressure during long-term use, the inner diameter of the rubber sleeve 2 is the same as the inner diameters of two sections of pipelines at two sides of the valve body 1.

Preferably, the controller is a PLC controller.

As a further preferred option, the air reservoir body 4 may be connected to an external high pressure air source via a high pressure air transmission line, so that the air reservoir 15 may be inflated by the external high pressure air source, and the air pressure in the air reservoir 15 may be ensured to be within a set pressure range, wherein the pressure relief valve 8 may ensure that the pressure in the air reservoir 15 is not higher than the set pressure thereof, when the pressure in the air reservoir 15 exceeds the set pressure of the pressure relief valve 8, the pressure relief valve 8 is opened to discharge a part of air outside the air reservoir, and when the air pressure in the air reservoir 15 is less than the set pressure of the pressure relief valve 8, the pressure relief valve 8 is closed.

Working principle: when the pinch valve device is installed between two sections of pipelines of the protected device in normal operation, dust or materials in the two sections of pipelines can normally pass along with air flow. When spark, explosion and other conditions occur at the upstream or downstream of the pipeline, the detector at the upstream or downstream of the pipeline acquires an explosion signal in the pipeline in real time and transmits the explosion signal to the controller in real time, the controller analyzes and processes the explosion signal and then controls the air inlet pressure regulating valve 3 to obtain electricity, after the air inlet pressure regulating valve 3 is obtained, the upper cavity of the piston cylinder 6 is communicated with the outside atmosphere, and high-pressure gas in the gas storage chamber 15 overcomes the elasticity of the reset spring 25 to jack up the piston 7 and leaves the lower end plate 21. The high-pressure gas in the gas storage chamber 15 enters the annular air cavity in the valve body 1 through the plurality of vent holes 22, the gas passing holes, the composite communication pipeline 20 and the air inlet A18 and acts on the outer side of the middle part of the rubber sleeve 2, and the exhaust valve 13 is in a normally closed state under the normal state of no electricity, so that the middle part of the rubber sleeve 2 is instantaneously closed under the action of air pressure, thereby effectively isolating flame and shock waves produced by explosion. After the explosion accident is over, the controller is used for controlling the exhaust valve 13 to be electrified, the internal valve port of the exhaust valve 13 is opened after the electricity is obtained, the annular air cavity 24 is communicated with the outside atmosphere, high-pressure air therein is discharged to the outside, the rubber sleeve 2 is restored to the original state, the controller is used for controlling the exhaust valve 13 to lose electricity, the internal valve port of the exhaust valve 13 is closed after the electricity is lost, partial air is reserved in the annular air cavity 24, the situation that the rubber cavity 2 cannot be damaged due to the fact that the internal pressure is overlarge in the later conveying process is ensured, and normal production work can be restored after danger is eliminated.

According to the utility model, the air storage cylinder body is supported above the valve body, so that pressure air can be conveniently filled into the air storage chamber in the air storage cylinder body, and the air storage chamber can be provided by the pinch valve device, so that a high-pressure air source can be conveniently used as a power source for opening and closing the valve body, and the quick closing action of the valve body can be conveniently realized by using a short air path. The center of the lower end plate of the piston cylinder is provided with an air passing hole communicated with the composite communication pipeline, and meanwhile, the periphery of the lower end plate is provided with a plurality of air holes communicated with the air storage chamber, so that the lower cavity of the piston cylinder can be a communication air chamber communicated with the air storage chamber and the composite communication pipeline, and meanwhile, a piston arranged in the piston cylinder in a sliding manner can be used as an on-off control part of the air passing communication air chamber. The main body section of the vertically arranged composite communication pipeline is arranged in the air storage chamber, the upper end of the main body section is communicated with the lower cavity of the piston cylinder through the air passing hole on the lower end plate, and the lower end of the main body section is communicated with the annular air cavity through the air inlet A on the valve body, so that a passage among the air storage chamber, the lower cavity of the piston cylinder, the composite communication pipeline and the annular air cavity is established, when the piston leaves the lower end plate, the high-pressure air in the air storage chamber can be ensured to enter the annular air cavity through the lower cavity of the piston cylinder and the composite communication pipeline, thereby the central area of the rubber sleeve can be extruded, the rubber sleeve can be rapidly closed, the communication state between the two sections of pipelines can be effectively isolated after the rubber sleeve is closed, the purpose of flame proof is achieved, in addition, when the piston moves to a state of being attached to the lower end plate, a passage between the composite communication pipeline and the air storage chamber is disconnected, so that the rubber sleeve can be ensured to be in a communicated state in a normal state, furthermore, the arrangement mode can ensure that the air passage stroke for controlling the closing action of the rubber sleeve is short, the rubber sleeve can be ensured to be in a closed state within tens of milliseconds, and the response speed is effectively improved. The valve port P of the air inlet pressure regulating valve is communicated with the air inlet hole B in the center of the upper end plate of the piston cylinder through a communication pipeline, and the valve port A is communicated with the air storage chamber through a connecting port on the air storage cylinder body, so that part of pressure air in the air storage chamber can be guided into the upper cavity of the piston cylinder through a passage between the valve port A and the valve port P, and meanwhile, a return spring is arranged above the piston in the piston cylinder, so that the air pressure in the air storage chamber is matched with the elasticity of the return spring to jointly act on the upper end surface of the piston, the air pressure of the lower cavity of the piston cylinder can be effectively overcome, the piston can be tightly attached to the lower end plate in a normal state, and the normal communication state of the pinch valve can be ensured. the center of the bottom of the valve body is provided with the exhaust port A communicated with the waist of the valve cavity, and the exhaust valve A is connected with the exhaust port A, so that the annular air cavity is conveniently in a closed state or is communicated with the outside atmosphere through the control of the exhaust valve, when the valve is in the closed state, the high-pressure air in the air storage chamber can be ensured to be more efficiently acted on the middle part of the rubber sleeve, the rubber sleeve can be more rapidly converted into the closed state, meanwhile, the duration of the closed state can be ensured, when the valve is in the state of being communicated with the outside atmosphere, the air pressure in the annular air cavity is the same as the outside air pressure, the rubber sleeve is further in the communicated state, and the maintenance of a connecting passage between two sections of pipelines is ensured. The pipe clamping valve device has the advantages of simple structure, convenient maintenance process, low manufacturing cost, high reliability and quick response, can meet the explosion isolation requirements of the upstream and downstream pipelines of the dust collection system, and can effectively isolate the propagation of pressure, shock waves, flame and the like generated in explosion in the pipelines.

Claims (9)

1. A pneumatic bidirectional reusable pinch valve device comprises a valve body (1) and a rubber sleeve (2); the device is characterized by further comprising a cylinder storage block (4), a piston cylinder (6), a piston (7), a return spring (25), a composite communication pipeline (20), an air inlet pressure regulating valve (3) and an exhaust valve (13);

A valve cavity (10) is arranged in the valve body (1); the rubber sleeve (2) is assembled in the valve cavity (10), and an annular air cavity (24) is arranged between the rubber sleeve (2) and the valve body (1); an air inlet hole A (18) communicated with the annular air cavity (24) is formed in the top of the valve body (1), and an air outlet hole A (17) communicated with the annular air cavity (24) is formed in the bottom of the valve body (1);

The inside of the air storage cylinder body (4) is provided with an air storage chamber (15), and the air storage cylinder body (4) is supported right above the valve body (1) through a right-angle support (14); a cylinder body mounting hole (27) is formed in the top center of the air storage cylinder body (4), and a pipe body outlet hole (28) is formed in the bottom center of the air storage cylinder body;

the composite communication pipeline (20) is vertically arranged, the main body section of the composite communication pipeline is positioned in the air storage chamber (15), the upper end of the composite communication pipeline is positioned right below the cylinder body mounting hole (27), the lower part of the composite communication pipeline is inserted into the pipe body outlet hole (28) and is in sealing connection with the pipe body outlet hole (28), and the lower end of the composite communication pipeline extends to the outer side of the air storage cylinder body (4) and is fixedly inserted into the air inlet hole A (18);

The piston cylinder (6) is fixedly arranged in the cylinder body mounting hole (27) and is in sealing connection with the cylinder body mounting hole (27); an upper end plate (23) of the piston cylinder (6) is positioned at the outer side of the air storage cylinder body (4), an air inlet hole B (29) is formed in the central area of the upper end plate (23), a lower end plate (21) of the piston cylinder (6) is positioned in the air storage chamber (15), the lower end face of the lower end plate (21) is fixedly connected with the upper end of the composite communication pipeline (20), an air passing hole is formed in the inner part of the upper end of the composite communication pipeline (20), and a plurality of air holes (22) are formed in the outer part of the upper end of the composite communication pipeline (20);

The piston (7) is mounted in a sliding and sealing manner in the piston cylinder (6);

The return spring (25) is arranged in the piston cylinder (6) and is positioned at the upper part of the piston (7), the upper end of the return spring (25) is connected with the upper end plate (23), and the lower end of the return spring is connected with the upper end of the piston (7);

The air inlet pressure regulating valve (3) is arranged at the outer side of the air storage cylinder body (4) and is provided with a valve port P, a valve port A and a valve port B, the valve port P is connected with an air inlet hole B (29) through a communication pipeline (19), the valve port A is connected with a connecting port formed on the air storage cylinder body (4) through a pipeline and is communicated with the air storage chamber (15) through the connecting port, and the valve port B is communicated with the external atmosphere; the air inlet pressure regulating valve (3) is a reversing valve, one working position of the air inlet pressure regulating valve is in a state that a valve port P is communicated with a valve port A, and the other working position of the air inlet pressure regulating valve is in a state that the valve port P is communicated with a valve port B;

The exhaust valve (13) is arranged outside the valve body (1), and an air inlet pipeline of the exhaust valve is fixedly inserted into an exhaust hole A (17) of the valve body (1).

2. A pneumatic bi-directional reusable pinch valve device as claimed in claim 1, further comprising a pressure relief valve (8) and pressure gauge (9); the pressure release valve (8) is arranged on one side of the outside of the air storage cylinder body (4), and an air inlet pipeline of the pressure release valve is fixedly inserted into a pressure release opening formed in the air storage cylinder body (4) and is communicated with the air storage chamber (15) through the pressure release opening; the pressure gauge (9) is arranged on one side of the outer part of the air storage body (4), and an air inlet pipeline of the pressure gauge is fixedly inserted into a detection port formed in the air storage body (4) and is communicated with the air storage chamber (15) through the detection port, so that the gas pressure in the air storage chamber (15) is monitored in real time.

3. A pneumatic bi-directional reusable pinch valve device according to claim 2, characterized in that the composite communication line (20) consists of a straight connector (26), a connecting sleeve (5), an upper connecting tube (11), a lower connecting tube (12) and; the lower end of the straight connector (26) is fixedly inserted into the air inlet hole A (18); the connecting sleeve (5) is arranged in the middle of the air storage chamber (15), and an upper pipe body mounting hole and a lower pipe body mounting hole which are mutually communicated are formed in the upper part and the lower part of the connecting sleeve oppositely; the upper connecting pipe (11) is vertically arranged, the lower end of the upper connecting pipe is fixedly inserted into the upper pipe body mounting hole in a sealing way, and the upper end of the upper connecting pipe is connected with the lower end plate (21); the lower connecting pipe (12) is vertically arranged, the upper end of the lower connecting pipe is fixedly inserted into the lower pipe body mounting hole in a sealing way, the lower end of the lower connecting pipe extends to the outer side of the air reservoir body (4) through the pipe body outlet hole (28) and is fixedly inserted into the upper end of the straight connecting head (26) in a sealing way; the lower connecting pipe (12) is connected with the pipe body outlet hole (28) in a sealing way.

4. A pneumatic two-way reusable pinch valve device as claimed in claim 3, further comprising a pair of flanges (16), the pair of flanges (16) being fixedly connected to a pair of mounting holes at both ends of the valve body (1) respectively, and simultaneously, pressing and fixing both ends of the rubber sleeve (2) to both ends of the valve body (1).

5. The pneumatic bi-directional reusable pinch valve device of claim 4, wherein the inlet pressure regulating valve (3) is a two-position three-way electromagnetic directional valve, which is operated in a right position in a non-energized state, which is operated in a left position in an energized state, with valve port P in communication with valve port a, and which is operated in a communicating state with valve port B.

6. A pneumatic bi-directional reusable pinch valve apparatus as claimed in claim 5, further comprising a controller and a number of detectors, one or two, when the number is two, the two detectors are respectively mounted on two sections of tubing on both sides of the valve body (1), and when the number is one, the detectors are mounted on a section of tubing on one side of the valve body (1); the input end of the controller is connected with the detector, and the output end of the controller is respectively connected with the air inlet pressure regulating valve (3) and the air outlet valve (13).

7. A pneumatic bi-directional reusable pinch valve device as claimed in claim 6 wherein the detector is a pressure sensor.

8. A pneumatic bi-directional reusable pinch valve device as claimed in claim 7, wherein the inner diameter of the rubber sleeve (2) is the same as the inner diameter of the two sections of tubing on either side of the valve body (1).

9. A pneumatic bi-directional reusable pinch valve device as claimed in claim 8 wherein the controller is a PLC controller.