CN212804426U - Valve is exhaled to pilot-operated formula - Google Patents

Abstract

The utility model discloses a pilot-operated type exhalation valve, which relates to the technical field of special equipment and comprises an exhalation valve mechanism, a film mechanism and a pilot valve mechanism which are connected in sequence; the valve-calling mechanism comprises a valve-calling body, a valve-calling seat and a valve-calling flap; the membrane mechanism comprises a lower cylinder body and a separation structure for dividing the inner part of the lower cylinder body into an upper chamber and a lower chamber, the separation structure can generate up-and-down displacement in the lower cylinder body, and the separation structure is also provided with a connecting rod connected with the exhalation valve flap; the pilot valve mechanism comprises a pilot valve body, a pilot valve seat arranged in the pilot valve body and a pilot valve core capable of automatically closing the pilot valve seat, wherein the inlet end of the pilot valve body is communicated with the upper chamber, and an air path pipe is connected between the inlet end of the pilot valve body and the inlet end of the pilot valve body. The utility model discloses can automatic release the internal pressure of jar when making jar internal pressure rise, make the LNG storage tank keep the safe operation.

Description

Valve is exhaled to pilot-operated formula

Technical Field

The utility model relates to a special equipment technical field particularly, relates to a valve is exhaled to guide's formula.

Background

During the work of the LNG storage tank, LNG media can be filled into the tank body, and the pressure of the media in the tank can be gradually increased along with the increase of the media in the filling process; meanwhile, when the medium in the tank body increases along with the storage time, the LNG medium can be gasified, so that the pressure in the tank body is abnormally increased.

Aiming at the problems, if the pressure in the tank body is not discharged and reduced in time, the safety of the tank body has huge hidden trouble.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a valve is exhaled to guide's formula, can automatic release the internal pressure of jar when making jar internal pressure rise, make the LNG storage tank keep safe operation.

For realizing the purpose of the utility model, the technical proposal adopted is that: a pilot-operated exhale valve comprises an exhale valve mechanism, a film mechanism and a pilot valve mechanism which are connected in sequence; the valve-calling mechanism comprises a valve-calling body, a valve-calling seat and a valve-calling flap; the membrane mechanism comprises a lower cylinder body and a separation structure for dividing the inner part of the lower cylinder body into an upper chamber and a lower chamber, the separation structure can generate up-and-down displacement in the lower cylinder body, and the separation structure is also provided with a connecting rod connected with the exhalation valve flap; the pilot valve mechanism comprises a pilot valve body, a pilot valve seat arranged in the pilot valve body and a pilot valve core capable of automatically closing the pilot valve seat, wherein the inlet end of the pilot valve body is communicated with the upper chamber, and an air path pipe is connected between the inlet end of the pilot valve body and the inlet end of the pilot valve body.

Furthermore, still install on exhaling the valve body and exhale the valve gap, exhale and install the guide cylinder on the valve gap, and connecting rod middle part slidable mounting is in the guide cylinder.

Furthermore, the lower end of the connecting rod is riveted with the breathing valve clack in a spherical mode.

Furthermore, the separation structure is a pneumatic diaphragm, the edge of the pneumatic diaphragm is fixed on the lower cylinder body, and the upper end of the connecting rod is fixed with the pneumatic diaphragm.

Furthermore, a tray is fixedly installed in the middle of the pneumatic diaphragm, and the upper end of the connecting rod is fixed with the pneumatic diaphragm and the tray together.

Furthermore, the connecting rod is of a hollow structure, and one end of the connecting rod, which is close to the pneumatic diaphragm, is also provided with a limit nut matched with the inner wall of the lower cylinder body.

Furthermore, the guide valve body comprises an upper cylinder body and a connector, the connector is arranged between the lower cylinder body and the upper cylinder body, the guide valve seat is arranged in the connector, and the outlet end of the gas path pipe is communicated with the lower end of the connector; a guide valve connecting rod capable of moving up and down is installed in the upper cylinder body, and a guide valve core is fixedly installed at the lower end of the guide valve connecting rod.

Furthermore, a sealing sheet is pressed between the connecting body and the upper cylinder body, and the guide valve connecting rod penetrates through the sealing sheet in a sealing mode and extends to the guide valve seat.

Further, the top of the upper cylinder body is also provided with a sleeve, and the upper end of the sleeve is closed; and a limiting disc is further installed on the pilot valve connecting rod, and a supporting spring is installed between the limiting disc and the top of the sleeve.

Furthermore, the top of the sleeve is also provided with a stud capable of being axially adjusted, and the stud is also provided with a locking nut for locking the stud; and a spring seat is further arranged in the sleeve and is tightly propped between the stud and the supporting spring.

Furthermore, a guide valve diaphragm is also arranged in the upper cylinder body, and the middle part of the guide valve connecting rod is fixed together with the guide valve diaphragm.

Furthermore, the number of the pilot valve membranes is two, a pilot valve spacer ring is also pressed between the two pilot valve membranes, and two pressure plates for respectively pressing the pilot valve membranes are also arranged on the pilot valve connecting rod.

Further, the guide valve seat is in threaded connection with the connecting body.

Furthermore, at least one annular groove is formed in the upper plane of the guide valve seat, and a sealing ring is installed in the annular groove.

The utility model has the advantages that,

the utility model discloses can be when the pressure in the jar body rises to the set pressure value, the medium can enter into the pilot valve mechanism through the gas circuit pipe earlier, and make the pilot valve mechanism started earlier, the pilot valve core is kept away from the pilot valve seat, make the pilot valve mechanism opened, make partly medium discharge from the pilot valve body, discharge gradually along with the medium, because pilot valve mechanism and last cavity intercommunication, make the pressure in the last cavity reduce gradually, make the partition structure upwards move in the lower cylinder body, thereby drive the valve clack and upwards remove, make the valve seat of breathing out open, make the medium can discharge through the exit end of breathing out the valve body, realize the function of decompression; when the pressure in the tank body is smaller than the set pressure value, the guide valve core closes the guide valve seat, the pressure in the tank body enters the guide valve mechanism through the air passage pipe, so that the pressure in the upper chamber and the pressure in the tank body are kept balanced, the separation structure is reset, the exhalation valve clack moves towards the exhalation valve seat, and the exhalation valve mechanism is automatically closed. The whole process automatically realizes opening and closing, and automatic pressure relief is realized, so that the safety of the tank body is protected.

Drawings

FIG. 1 is a block diagram of a pilot exhalation valve provided by the present invention;

fig. 2 is a cross-sectional view of a pilot exhalation valve provided by the present invention;

FIG. 3 is a block diagram of a pilot valve seat.

Reference numbers and corresponding part names in the drawings:

1. a valve expiration mechanism 2, a membrane mechanism 3, a pilot valve mechanism 4 and a gas circuit pipe;

100. the breather valve comprises a breather valve body 101, a breather valve seat 102, a breather valve flap 103, a breather valve cover 104 and a guide cylinder;

200. the pneumatic device comprises a lower cylinder body 201, an upper chamber 202, a lower chamber 203, a connecting rod 204, a pneumatic diaphragm 205, a tray 206 and a limit nut;

300. the pilot valve comprises a pilot valve body 301, a pilot valve seat 302, a pilot valve core 303, a pilot valve connecting rod 304, a sealing sheet 305, a sleeve 306, a limiting disc 307, a supporting spring 308, a stud 309, a locking nut 310, a spring seat 311, a pilot valve diaphragm 312, a pilot valve spacer ring 313, a pressure plate 314, a shaft sleeve 315, a ring groove 316 and a sealing ring;

3001. an upper cylinder 3002 and a connecting body.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.

As shown in fig. 1 to 3, the utility model provides a valve is exhaled to guide's formula, including exhaling valve mechanism 1, membrane mechanism 2 and pilot valve mechanism 3 that connect gradually, exhale valve mechanism 1 and connect on the pressure release pipeline of the jar body, membrane mechanism 2 installs on exhaling valve mechanism 1, and pilot valve mechanism 3 installs on membrane mechanism 2, but the messenger exhales valve mechanism 1, membrane mechanism 2 and pilot valve mechanism 3 linkage action.

Exhale valve mechanism 1 including exhaling valve body 100, exhale valve seat 101 and exhale valve flap 102, exhale valve body 100 and connect on the pressure release pipeline for the flow of medium, exhale valve seat 101 and install in exhaling valve body 100, and exhale the opening of valve seat 101 and be the level form, exhale valve flap 102 and compress tightly on exhaling the opening of valve seat 101, when exhaling valve flap 102 and keep away from exhaling valve seat 101, exhale valve seat 101 and open, the medium accessible exhales valve body 100 and flows, when exhaling valve flap 102 and compress tightly on exhaling valve seat 101, exhale valve seat 101 and be closed, make exhale valve body 100 and cut, realize the closing to exhaling valve seat 101, make the medium can not be through exhaling.

The film mechanism 2 comprises a lower cylinder body 200 and a separation structure for dividing the interior of the lower cylinder body 200 into an upper chamber 201 and a lower chamber 202, the upper chamber and the lower chamber have the same structure, and the separation structure can generate vertical displacement in the lower cylinder body 200; the separating structure is also fixedly provided with a connecting rod 203, the lower end of the connecting rod 203 extends towards the inside of the exhaling valve body 100 and is connected with the exhaling valve clack 102, so that when the separating structure acts, the separating structure drives the connecting rod 203 to act, and the connecting rod 203 acts and simultaneously drives the exhaling valve clack 102 to act, thereby realizing the control of the exhaling valve mechanism 1.

The pilot valve mechanism 3 comprises a pilot valve body 300, a pilot valve seat 301 arranged in the pilot valve body 300 and a pilot valve core 302 capable of automatically closing the pilot valve seat 301, wherein the pilot valve seat 301 is matched with the pilot valve core 302, when the pilot valve core 302 is tightly pressed on the pilot valve seat 301, the pilot valve seat is closed, so that a medium cannot pass through the pilot valve seat 301, and when the pilot valve core 302 is far away from the pilot valve seat 301, the pilot valve seat 301 is opened, so that the medium can smoothly pass through the pilot valve seat 301; the inlet end of the pilot valve body 300 is communicated with the upper chamber 201, that is, the medium entering the pilot valve body 300 can enter the upper chamber 201 at the same time, so that the pressure at the inlet end of the pilot valve body 300 is always consistent with the pressure in the upper chamber 201; still be connected with gas circuit pipe 4 between leading valve body 300 entrance point and exhale the valve body 100 entrance point, exhale the medium in the valve body 100 entrance point promptly and can enter into the entrance point of leading valve body 300 through gas circuit pipe 4, make leading valve mechanism 3 under the state of not opening, exhale the pressure maintenance in valve body 100 entrance point, leading valve body 300 entrance point and the last cavity 201, thereby guarantee the utility model discloses under the condition that the jar body keeps normal pressure value, be in the closed condition all the time.

When the pressure in the tank body rises to a set pressure value, a medium enters the inlet end of the pilot valve body 300 and the upper chamber 201 through the gas path pipe 4, at the moment, the pressure of the medium at the inlet end of the pilot valve body 300 is greater than the pressure of the pilot valve core 302 pressed on the pilot valve seat 301, so that the pressure of the medium pushes the pilot valve core 302 to move upwards, the pilot valve core 302 is far away from the pilot valve seat 301, the pilot valve mechanism 3 is opened, a part of the medium is discharged from the pilot valve body 300, the medium is gradually discharged along with the medium, the pressure in the upper chamber 201 is gradually reduced due to the communication between the inlet end of the pilot valve body 300 and the upper chamber 201, the separation structure moves upwards in the lower cylinder body 200, and the connecting rod 203 and the exhalation valve flap 102 are driven to move upwards, the exhalation valve seat 101 is opened, the medium can be discharged through the outlet end of the exhalation; when the pressure in the tank body is smaller than the set pressure value, the pressing force of the pilot valve core 302 pressing on the pilot valve seat 301 is larger than the pressure of the medium at the inlet end of the pilot valve body 300, so that the pilot valve core 302 presses on the pilot valve seat 301, the pilot valve mechanism 3 is automatically closed, at the moment, the pressures of the inlet end of the pilot valve body 300, the upper chamber 201 and the inlet end of the exhalation valve body 100 are kept balanced, the separation structure is reset, the exhalation valve clack 102 moves towards the exhalation valve seat 101, and the exhalation valve mechanism 1 is automatically closed.

The exhalation valve body 100 is also provided with an exhalation valve cover 103, the exhalation valve cover 103 is fixedly arranged on the exhalation valve body 100 through a screw, and a sealing ring is also arranged between the exhalation valve cover 103 and a pressing surface of the exhalation valve body 100 in a pressing manner, so that the sealing property between the exhalation valve cover 103 and the exhalation valve body 100 is ensured; the pilot cylinder 104 is arranged on the exhalation valve cover 103, the pilot cylinder 104 can be fixed on the exhalation valve cover 103 through screws, and the pilot cylinder 104 and the compression surface of the exhalation valve cover 103 are fixed in a sealing manner through a sealing ring; the guide cylinder 104 and the exhalation valve cover 103 can be connected by welding, integral forming and the like; connecting rod 203 middle part slidable mounting is in guide cylinder 104, and guide cylinder 104 and connecting rod 203 seal up cooperation, when making connecting rod 203 slide from top to bottom in guide cylinder 104, remain sealed cooperation throughout between connecting rod 203 and the guide cylinder 104, effectively prevent down the exit end intercommunication of cavity 202 and pilot valve body 300, the pressure in the cavity 202 changes under avoiding, makes the utility model discloses a more accurate.

The connecting rod 203 is a hollow rod, so that the weight of the connecting rod 203 is smaller, the load of the separation structure is reduced, and the separation structure can more conveniently drive the exhalation valve flap 102 to move up and down; the lower end of the connecting rod 203 is riveted with the ball of the exhaling valve clack 102, namely the exhaling valve clack 102 is provided with a ball socket, the connecting rod 203 is provided with a ball rivet joint, the ball rivet joint on the connecting rod 203 is clamped on the ball socket, the connecting rod 203 is connected with the exhaling valve clack 102, the exhaling valve clack 102 has the universal property, errors caused by precision of each position can be effectively made up, and the sealing matching effect between the exhaling valve clack 102 and the guide valve seat 301 is better.

The exhalation valve flap 102 is in a cap shape, the opening of the flap faces downwards, the lower surface of the flap is also provided with a sealing ring matched with the guide valve seat 301, the sealing ring is attached to the lower surface of the exhalation valve flap 102, the diameter of the circular surface of the sealing ring is in interference fit with the diameter of the inner wall of the exhalation valve flap 102, so that after the sealing ring is arranged on the exhalation valve flap 102, the outer circular surface of the sealing ring is clamped with the inner wall of the exhalation valve flap 102, and the outer edge of the sealing ring; the inner wall of the sealing ring is in a circular truncated cone shape, namely, the inner channel of the sealing ring is in a circular truncated cone shape, and the inner diameter of one end, attached to the exhalation valve flap 102, of the sealing ring is smaller than the inner diameter of one end, far away from the exhalation valve flap 102, of the sealing ring; exhale valve clack 102 lower surface and still install the clamp plate that compresses tightly the sealing ring, the round platform form is personally submitted to the clamp plate circumference, makes the clamp plate laminating exhale the diameter of valve clack 102 one end and is greater than the clamp plate and keeps away from the diameter of exhaling valve clack 102 one end, when making the clamp plate edge compress tightly the sealing ring inward flange, through the cooperation of the outer disc of clamp plate and the interior disc of sealing ring, can not only realize compressing tightly fixedly the sealing ring inward flange, and make the sealing ring inward flange after compressing tightly, the sealing ring.

The separation structure is a pneumatic diaphragm 204, the lower cylinder body 200 is of a two-half structure, the edge of the pneumatic diaphragm 204 is tightly pressed between the two-half structure of the lower cylinder body 200, the pneumatic diaphragm 204 can be fixed, the sealing performance between the upper chamber 201 and the lower chamber 202 is better, and the leakage between the upper chamber 201 and the lower chamber 202 is effectively prevented; the upper end of the connecting rod 203 is fixed with the pneumatic diaphragm 204, so that the pneumatic diaphragm 204 drives the connecting rod 203 to move when moving, and the connecting rod 203 is linked. When the interior of the lower cylinder body 200 is a piston cylinder, the partition structure can also adopt a piston, and the piston moves in the piston cylinder through the change of the medium pressure in the upper chamber 201, although the linkage of the connecting rod 203 can be realized by the structure, the demand on the medium pressure is larger.

The middle of the pneumatic membrane 204 is fixedly provided with the tray 205, the upper surface of the tray 205 is in sealing fit with the lower surface of the pneumatic membrane 204, the middle of the pneumatic membrane 204 is supported by the tray, the hardness of the middle of the pneumatic membrane 204 is increased, the upper end of the connecting rod 203 is more convenient to fix, the mounting part of the upper end of the connecting rod 203 is effectively prevented from being leaked, and the sealing performance between the upper chamber 201 and the lower chamber 202 is better.

The end of the connecting rod 203 close to the pneumatic diaphragm 204 is also provided with a limit nut 206 matched with the inner wall of the lower cylinder body 200, the limit nut is positioned in the lower chamber 202 and is mainly used for limiting the connecting rod 203 when moving downwards, and the connecting rod 203 is effectively prevented from excessively moving downwards to cause the breath valve flap 102 to be pressed on the breath valve seat 101 to cause the breath valve flap 102 to be damaged.

The pilot valve body 300 comprises an upper cylinder body 3001 and a connecting body 3002, the interior of the connecting body 3002 is a hollow pile, the upper end of the connecting body 3002 is fixed with the upper cylinder body 3001, and the lower end of the connecting body 3002 is fixed with the lower cylinder body 200 and communicated with the upper chamber 201; the guide valve seat 301 is fixedly installed in the connecting body 3002, the outlet end of the gas path pipe 4 is communicated with the lower end of the connecting body 3002, so that after a medium discharged through a gas path directly enters the connecting body 3002, a part of the medium can directly enter the upper chamber 201 through the connecting body 3002; the upper cylinder 3001 is internally provided with a pilot valve connecting rod 303 capable of moving up and down, the central axis of the pilot valve connecting rod 303 is in the same straight line with the central axis of the pilot valve seat 301, the pilot valve core 302 is fixedly arranged at the lower end of the pilot valve connecting rod 303, and when the pilot valve connecting rod 303 moves up and down, the pilot valve core 302 moves up and down synchronously along with the pilot valve connecting rod 303, so that the pilot valve core 302 is close to or far away from the pilot valve seat 301, and the pilot valve seat 301 is opened or.

The cross section of the pilot valve core 302 is in a convex shape, the top of the pilot valve core 302 is in a spherical surface shape, the lower end surface of the pilot valve connecting rod 303 is provided with a groove matched with the top of the pilot valve core 302, the top of the pilot valve core 302 is embedded in the groove, and the pilot valve core 302 and the pilot valve connecting rod 303 are fixed through screws, so that the pilot valve core 302 is more stable between the pilot valve core 302 and the pilot valve connecting rod 303 after the pilot valve core 302 is installed on the pilot valve connecting rod 303; an O-shaped sealing ring can be pressed between the upper surface of the pilot valve core 302 and the lower surface of the pilot valve connecting rod 303, so that after the pilot valve core 302 is pressed on the pilot valve seat 301, the pilot valve core 302 is more stable, and the pressing effect of the pilot valve core 302 and the pilot valve seat 301 is better.

A sealing sheet 304 is also pressed between the connecting body 3002 and the upper cylinder 3001, and the pilot valve connecting rod 303 penetrates through the sealing sheet 304 in a sealing manner and extends towards the pilot valve seat 301; the sealing piece 304 is made of rubber, which not only separates the connecting body 3002 from the upper cylinder 3001, but also enables the pilot valve connecting rod 303 to move up and down normally, thereby effectively preventing the medium passing through the pilot valve seat 301 from entering the upper cylinder 3001 when the pilot valve seat 301 is in an open state, and enabling the medium passing through the pilot valve seat 301 to be discharged smoothly and directly.

The top of the upper cylinder 3001 is also provided with a sleeve 305, the upper end of the sleeve 305 is closed, the lower end of the sleeve 305 is communicated with the inside of the upper cylinder 3001, and the central axis of the sleeve 305 and the central axis of the pilot valve connecting rod 303 are on the same straight line; the pilot valve connecting rod 303 is further provided with a limiting disc 306, a supporting spring 307 is arranged between the limiting disc 306 and the top of the sleeve 305, the upper end of the supporting spring 307 abuts against the inside of the sleeve 305, and the lower end of the supporting spring 307 is sleeved on the pilot valve connecting rod 303 and abuts against the limiting disc 306. The supporting spring 307 can push the pilot valve connecting rod 303 through the elastic force of the supporting spring 307, so that the lower end of the pilot valve connecting rod 303 is always abutted against the pilot valve seat 301, and when the pressure of a medium is smaller than the elastic force of the supporting spring 307, the pilot valve core 302 is always abutted against the pilot valve seat 301, so that the pilot valve seat 301 is always in a closed state; when the pressure of the medium is greater than the elastic force of the support spring 307, the pressure of the medium acts on the pilot valve core 302 to push the pilot valve core 302 to move upward, so that the pilot valve connecting rod 303 moves upward, the support spring 307 is compressed, and the pilot valve seat 301 is automatically opened or closed.

The top of the sleeve 305 is also provided with an axially adjustable stud 308, the central axis of the stud 308 and the central axis of the sleeve 305 are on the same straight line, the stud 308 is in threaded fit with the sleeve 305, and the stud 308 moves up and down on the sleeve 305 by rotating the stud 308; a locking nut 309 for locking the stud 308 is further arranged on the stud 308, and the locking nut 309 is used for locking the stud 308 and the sleeve 305 to prevent the stud 308 from freely moving on the sleeve 305; a spring seat 310 is further installed in the sleeve 305, the spring seat 310 is in an inverted convex shape, the large diameter of the spring seat 310 is in clearance fit with the inner diameter of the sleeve 305, the upper end of the supporting spring 307 is sleeved at the small diameter end of the spring seat 310, the upper end of the supporting spring 307 can be limited through the spring seat 310, and the upper end of the supporting spring 307 is installed more stably.

The upper end of the spring seat 310 is also provided with a center hole, the lower end of the stud 308 is conical, the lower end of the stud 308 is tightly propped in the center hole, and the position of the spring seat 310 is adjusted by adjusting the stud 308, so that the supporting force of the supporting spring 307 is adjusted; meanwhile, a protective sleeve used for covering the top of the screw rod can be fixedly arranged on the sleeve 305, and the protective sleeve is connected with the sleeve 305 through threads, so that the protective sleeve is more convenient to mount and dismount.

The upper cylinder 3001 is also internally provided with a pilot valve membrane 311, the upper cylinder 3001 comprises an upper part and a lower part, and the edge of the pilot valve membrane 311 is tightly pressed between the upper part and the lower part, so that the pilot valve membrane 311 is more convenient to fix; the middle part of the pilot valve connecting rod 303 and the pilot valve membrane 311 are jointly fixed, the position of the pilot valve connecting rod 303 can be effectively limited, and the pilot valve membrane 311 can assist the supporting spring 307, so that the pilot valve core 302 can be ensured to be pressed downwards enough, the pressing force of the pilot valve core 302 and the pilot valve seat 301 can be ensured under the condition that a medium does not push the pilot valve core 302 to move upwards, and the sealing performance of the closed pilot valve seat 301 can be ensured.

The number of the pilot valve membranes 311 is two, a pilot valve spacer ring 312 is also pressed between the two pilot valve membranes 311, and the two pilot valve membranes 311 are separated by the pilot valve spacer ring 312, so that the two pilot valve membranes 311 are supported by the pilot valve spacer ring 312; the pilot valve connecting rod 303 is further provided with two pressure plates 313 for respectively pressing the pilot valve membranes 311, the two pressure plates 313 are respectively located on the upper surfaces of the two pilot valve membranes 311, the two ends of the pilot valve connecting rod 303 are fixedly provided with shaft sleeves 314, the two shaft sleeves 314 respectively press the outer sides of the two pilot valve membranes 311, the middle pressing effect of the pilot valve membranes 311 is better, and the middle installation of the pilot valve membranes 311 is more stable.

The guide valve seat 301 is in threaded connection with the connecting body 3002, so that the guide valve seat 301 and the connecting body 3002 can be mounted and dismounted more conveniently; at least one annular groove 315 is formed in the upper plane of the guide valve seat 301, the annular groove 315 is an inverted isosceles trapezoid, so that the width of the bottom of the annular groove 315 is greater than the width of the opening of the annular groove 315, and after the sealing ring 316 is installed in the annular groove 315, the sealing ring 316 cannot easily fall off from the annular groove 315, so that the installation of the sealing ring 316 is more stable.

When the pressure at the inlet end of the exhalation valve body 100 rises to a set pressure value, a medium enters the lower end of the connecting body 3002 and the upper chamber 201 through the gas path pipe 4, at this time, the medium pressure at the lower end of the connecting body 3002 and the upper chamber 201 is greater than the pressure of the supporting spring 307 and the pressure of the pilot valve membrane 311 on the pilot valve connecting rod 303, so that the medium pressure acts on the pilot valve core 302 and pushes the pilot valve core 302 and the pilot valve connecting rod 303 to move upwards, the pilot valve core 302 is far away from the pilot valve seat 301, the supporting spring 307 is compressed, at this time, the pilot valve seat 301 is opened, the medium is discharged through the pilot valve seat 301, the medium pressure at the lower end of the connecting body 3002 and the medium pressure in the upper chamber 201 are reduced, the acting force acting on the pneumatic membrane 204 is reduced, the middle part of the pneumatic membrane 204 moves upwards, the connecting rod 203 and the valve flap 102 are driven to move, the functions of reducing pressure and pressure are realized.

When the pressure at the inlet end of the exhalation valve body 100 is smaller than the set pressure value, the medium pressure at the lower end of the connector 3002 and in the upper chamber 201 is smaller than the pressure of the support spring 307 and the pressure of the pilot valve diaphragm 311 on the pilot valve connecting rod 303, the support spring 307 and the pilot valve diaphragm 311 push the pilot valve connecting rod 303 to move downwards through the elasticity of the support spring 307 and the pilot valve diaphragm 311, so that the pilot valve core 302 is close to the pilot valve seat 301 and is pressed on the pilot valve seat 301, the pilot valve seat 301 is closed, at this time, the medium pressure at the lower end of the connector 3002 and in the upper chamber 201 is consistent with the pressure at the inlet end of the exhalation valve body 100, the pneumatic diaphragm 204 resets, the pneumatic diaphragm 204 pushes the connecting rod 203 and the exhalation valve flap 102 to move downwards, the.

The utility model discloses when using, the use is paird with the suction valve that corresponds when needing, and when the internal medium pressure of jar was higher than external atmospheric pressure, exhale valve discharge pressure, ensure internal and external pressure balance of jar. When the pressure in the tank body is lower than the external atmospheric pressure, the suction valve is opened to suck external gas, increase the medium pressure in the tank body and balance the internal pressure and the external pressure.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A pilot-operated exhaling valve is characterized by comprising an exhaling valve mechanism (1), a membrane mechanism (2) and a pilot valve mechanism (3) which are sequentially connected; the exhalation valve mechanism (1) comprises an exhalation valve body (100), an exhalation valve seat (101) and an exhalation valve flap (102); the film mechanism (2) comprises a lower cylinder body (200) and a separation structure which divides the interior of the lower cylinder body (200) into an upper chamber (201) and a lower chamber (202), the separation structure can generate vertical displacement in the lower cylinder body (200), and a connecting rod (203) connected with the breathing valve clack (102) is also arranged on the separation structure; the pilot valve mechanism (3) comprises a pilot valve body (300), a pilot valve seat (301) arranged in the pilot valve body (300) and a pilot valve core (302) capable of automatically closing the pilot valve seat (301), the inlet end of the pilot valve body (300) is communicated with the upper chamber (201), and an air path pipe (4) is connected between the inlet end of the pilot valve body (300) and the inlet end of the exhalation valve body (100).

2. The pilot-operated exhalation valve according to claim 1, characterized in that the exhalation valve body (100) is further provided with an exhalation valve cover (103), the exhalation valve cover (103) is provided with a guide cylinder (104), and the middle part of the connecting rod (203) is slidably arranged in the guide cylinder (104).

3. Piloted exhalation valve according to claim 1, characterized in that the separation structure is a pneumatic diaphragm (204), the pneumatic diaphragm (204) being fixed at its edge to the lower cylinder (200) and the upper end of the connecting rod (203) being fixed to the pneumatic diaphragm (204).

4. The pilot-operated exhalation valve according to claim 3, characterized in that a tray (205) is fixedly installed in the middle of the pneumatic diaphragm (204), and the upper end of the connecting rod (203) is fixed with the pneumatic diaphragm (204) and the tray (205) together.

5. The pilot-operated exhalation valve according to claim 3, characterized in that the connecting rod (203) is a hollow structure, and a limit nut (206) matching with the inner wall of the lower cylinder (200) is further installed at one end of the connecting rod (203) close to the pneumatic diaphragm (204).

6. The pilot-operated exhalation valve according to claim 1, characterized in that the pilot valve body (300) includes an upper cylinder body (3001) and a connecting body (3002), the connecting body (3002) is installed between the lower cylinder body (200) and the upper cylinder body (3001), the pilot valve seat (301) is installed in the connecting body (3002), and the outlet end of the airway tube (4) communicates with the lower end of the connecting body (3002); a pilot valve connecting rod (303) capable of moving up and down is installed in the upper cylinder body (3001), and a pilot valve core (302) is fixedly installed at the lower end of the pilot valve connecting rod (303).

7. Piloted exhalation valve according to claim 6, characterized in that a sealing plate (304) is also compressed between the connector (3002) and the upper cylinder (3001) and that the pilot valve connecting rod (303) extends sealingly through the sealing plate (304) towards the pilot valve seat (301); further, a sleeve (305) is further mounted at the top of the upper cylinder body (3001), and the upper end of the sleeve (305) is closed; and a limiting disc (306) is further arranged on the pilot valve connecting rod (303), and a supporting spring (307) is arranged between the limiting disc (306) and the top of the sleeve (305).

8. Piloted exhalation valve according to claim 7, characterized in that the top of said sleeve (305) is further provided with an axially adjustable stud (308), the stud (308) is further provided with a lock nut (309) for locking the stud (308); a spring seat (310) is further installed in the sleeve (305), and the spring seat (310) is tightly pressed between the stud (308) and the supporting spring (307).

9. The pilot exhalation valve according to claim 6, characterized in that a pilot valve diaphragm (311) is further installed in the upper cylinder (3001), and the middle part of the pilot valve connecting rod (303) is fixed together with the pilot valve diaphragm (311); furthermore, the number of the pilot valve membranes (311) is two, a pilot valve spacer ring (312) is pressed between the two pilot valve membranes (311), and two pressure plates (313) which respectively press the pilot valve membranes (311) are arranged on the pilot valve connecting rod (303).

10. Piloted exhalation valve according to claim 1, characterized in that the pilot valve seat (301) is screwed with a connector body (3002); furthermore, at least one ring groove (315) is formed in the upper plane of the guide valve seat (301), and a sealing ring (316) is installed in the ring groove (315).

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