CN116733986A

CN116733986A - Electric control air release valve

Info

Publication number: CN116733986A
Application number: CN202310832504.9A
Authority: CN
Inventors: 刘乙甫; 徐勇; 殷龙和; 周剑
Original assignee: Chengdu Huatai Aviation Technology Co ltd
Current assignee: Chengdu Huatai Aviation Technology Co ltd
Priority date: 2023-07-08
Filing date: 2023-07-08
Publication date: 2023-09-12

Abstract

The application relates to the technical field of accessory parts of aeroengines, and provides an electric control air release valve which comprises a shell, a valve body and a valve body, wherein the shell is provided with a channel and an air channel positioned at the periphery of the channel; the butterfly plate is rotationally connected in the channel; the support is fixedly connected with the shell above the channel and is provided with P which can be communicated with one end of the air channel ₃ An air inlet; the electromagnetic valve is fixedly arranged on the support; the transmission mechanism is fixedly arranged on the shell below the channel and connected with the butterfly plate, and is provided with a gas collecting cavity communicated with the other end of the air channel; after the electromagnetic valve is electrified, the gas is formed by P ₃ The air inlet is filled into the air collecting cavity through the air passage to increase the volume of the air collecting cavity, so that the butterfly plate rotates to close the passage; after the electromagnetic valve is powered off, the gas in the gas collecting cavity is discharged through the gas channel through the gas outlet of the electromagnetic valve to reduce the volume of the gas collecting cavity, so that the butterfly plate reversely rotates to open the channel. The electromagnetic valve and the transmission mechanism are used for controlling the opening and closing of the channel, so that the butterfly plate is not blocked, the engine surge is avoided, and the life safety of a pilot is effectively ensured.

Description

Electric control air release valve

Technical Field

The application relates to the technical field of accessory parts of aeroengines, in particular to an electric control air release valve.

Background

The bleed valve is used to vent the excess air from the axial compressor outlet of the engine to the atmosphere when the engine is started or at low speed, in order to start the engine smoothly and prevent compressor surge at Ng low speed, which is felt P ₃ /P ₀ The pressure ratio controls the opening and closing of the shutter.

At present, most of the structures of the air release valve consist of a control component, a channel component and a signal feedback component, wherein the key component of the control component is a valve capable of accurately sensing P ₃ /P ₀ The deflation valve of the vacuum bellows with the pressure ratio has the following characteristics:

1. the butterfly plate and the channel adopt a spherical clearance fit structure mode, and in order to ensure that the leakage quantity of the channel meets the requirement and the butterfly plate rotates smoothly, the fit clearance between the butterfly plate and the channel is controlled to be 0.1-0.2 mm. The butterfly plate and the shaft lever are integrated, and the two ends of the shaft lever are supported by sliding friction bearing sleeves, so that the butterfly plate and the channel are in spherical fit, and the assembly of the butterfly plate and the channel can be guaranteed only by adopting a split structure.

2. The bellows is used as a key component for controlling the opening and closing of a valve and consists of an inner bellows layer and an outer bellows layer, and the bellowsVacuum pumping is performed between the inner layer and the outer layer of the bellows, so that the inner layer and the outer layer of the bellows can feel the air pressure P of the high-pressure compressor ₃ And ambient pressure P ₀ Is a ratio of (2). The corrugated pipe is formed by stitch welding of a plurality of layers of metal wave plates, the welding mode adopts plasma welding or argon arc welding, and each layer of wave plate is generally punched by a metal plate with the thickness of 0.1-0.2 mm.

3. The driving structure in the channel assembly is a gear-rack mechanism, and in order to ensure that the gear and the rack can normally mesh, the processing requirement of the tooth shape is high, and the coaxiality requirement on the linear motion of the rack is high. In order to ensure economy and workability, a mode of respectively processing and then assembling and welding the rack and the guide sleeve is generally adopted.

However, the air release valve having the above characteristics has the following problems in practical use:

1. when the engine works in a sand dust environment, sand dust can pass through the air compressor and then is discharged out of the engine through the air release valve. For the air release valve with the existing structure, as the design of blocking sand dust is not adopted, finer sand dust is gradually accumulated in a gap between the shaft lever and the bushing in the process, and coarser sand dust is accumulated in a gap between the butterfly plate and the channel; when sand dust is accumulated to a certain extent, the friction force between the shaft rod and the bushing and the friction force between the butterfly plate and the channel are larger and larger, and finally the butterfly plate is blocked and cannot rotate. When the situation is serious, excessive gas of the gas compressor can not be discharged in time, so that the surge of the engine is caused, and the life safety of a pilot is endangered.

2. Limited by the structure and working form of the channel and the butterfly plate, the processing and assembling precision requirements of the channel and the butterfly plate are high. If the required machining and assembly precision cannot be guaranteed, the working reliability of the air release valve is reduced, even the air release valve can be caused to work, because of the influence of high-temperature working conditions, the heated size of the butterfly plate and the channel is changed, the fit clearance is reduced, and the butterfly plate is finally blocked and cannot rotate due to the fact that the machining precision and the assembly precision do not meet the requirements. Meanwhile, sand dust is easy to accumulate in the gap between the butterfly plate and the channel, and the butterfly plate is also blocked. The situation described in the first point then occurs: excessive gas cannot be timely discharged out of the compressor to cause engine surge, so that the life safety of pilots is endangered.

3. The bellows assembly is formed by assembling and welding a plurality of parts, so that the performance of welding equipment, the welding process and the control of the welding process are very high, and particularly the welding of the wave plate is very high. The welding equipment and the process maturity based on the existing domestic metal thin-wall parts are not high enough, so that the finished product rate of the domestic bellows assembly is low, the reliability is low, the processing period is long, the cost is high, and the later failure rate is high. The main failure modes are as follows: the pressure ratio caused by the vacuum micro-leakage of the diaphragm capsule is unqualified; the weld breaks causing the capsule to fail.

4. The processing precision requirement of the gear and the rack is high, the cost is high, and the economy is poor. And because of engine vibration, the meshing surface of the gear and the rack can be in a long-term abrasion state, and meanwhile, the reset spring of the piston can have circumferential rotation pretightening force on the piston during installation, and the phenomenon of eccentric abrasion of the tooth surface can occur during the long-term operation. When the abrasion loss reaches a certain value, the gear and the rack are easy to be meshed with each other and are not smooth, and the problem that the gear and the rack are possibly stuck when serious is solved, so that excessive gas of the gas compressor can not be discharged in time to cause the surge of the engine, and the life safety of a pilot is endangered.

Disclosure of Invention

Aiming at the defects of the prior art, the application provides the electric control air release valve, which solves the problem of high failure rate of the external field of the bellows type air release valve in an electric control mode, improves the integral response speed and reliability of the air release valve, has sand prevention capability, and solves the problem that the air release valve with the existing structure is easy to be blocked in the sand environment.

In order to achieve the above purpose, the present application provides the following technical solutions:

an electronically controlled bleed valve comprising:

the shell is provided with a channel and an air passage positioned at the periphery of the channel;

the butterfly plate is rotationally connected in the channel and used for switching the channel;

the support is fixedly connected with the shell above the channel and is provided with P which can be communicated with one end of the air channel ₃ An air inlet;

the electromagnetic valve is fixedly arranged on the support and used for controlling the P ₃ The air inlet is connected with the air passage; and

The transmission mechanism is fixedly arranged on the shell below the channel and connected with the butterfly plate, and is provided with a gas collecting cavity communicated with the other end of the air channel;

wherein after the electromagnetic valve is electrified, the gas is discharged from the P ₃ The air inlet is filled into the air collecting cavity through the air passage to increase the volume of the air collecting cavity, so that the butterfly plate rotates to close the passage; after the electromagnetic valve is powered off, the gas in the gas collecting cavity is discharged through the gas channel through the gas outlet of the electromagnetic valve to reduce the volume of the gas collecting cavity, so that the butterfly plate reversely rotates to open the channel.

In one embodiment of the disclosure, the housing below the channel is provided with a chamber with an axis perpendicular to the channel;

the transmission mechanism comprises a guide column with a sealing plate, a piston, a connecting rod, a rocker arm, a return spring and a sealing cover;

the sealing plate and the sealing cover are respectively and hermetically connected to the shells at the two ends of the cavity;

the inner wall of the piston is sealed and sleeved on the guide post in a sliding way, and the outer wall of the piston is sealed and matched with the cavity in a sliding way so as to divide the cavity into a gas-collecting cavity and a resetting cavity;

the piston, the connecting rod and the rocker arm are sequentially connected to form a crank-connecting rod mechanism;

one end of the rocker arm, which is far away from the crank connecting rod mechanism, is fixedly connected with the shaft lever of the butterfly plate;

the return spring is located in the return cavity and is in abutting connection between the piston and the sealing cover.

In one embodiment of the application, the piston is provided with a big end and a small end, the middle part of the piston is provided with a blind hole extending from the big end to the small end, and the inner wall of the blind hole is sealed and sleeved on the guide post in a sliding way;

the outer circumferential surface of the large end of the piston is in sealing and sliding fit with the inner wall of the cavity through a first lip-shaped sealing ring, the area between one side surface of the large end of the piston and the sealing plate is the gas-collecting cavity, and the area between the other side surface of the large end of the piston and the sealing cover is the reset cavity;

the side of piston tip dorsad piston big end is equipped with the annular groove, the closing cap be equipped with the annular boss that the annular groove corresponds, reset spring both ends are respectively through the spring washer conflict connect in between annular groove and the annular boss.

In one embodiment of the disclosure, the support is internally provided with a filter element and a throttling plate;

the filter element and the throttling sheet are sequentially arranged on the P ₃ Downstream of the air inlet.

In one embodiment of the application, a lining is inlaid on the inner wall of the shell at the joint of the channel and the butterfly plate, and an elastic expansion sleeve is arranged on the outer ring of the butterfly plate;

when the butterfly plate is in a closed state, the elastic expansion sleeve is tightly attached to the lining to form a sand prevention structure.

In one embodiment of the disclosure, two ends of the shaft lever are rotatably connected to a mounting hole formed in the housing through a bearing;

the inner wall of one end of the mounting hole, which is close to the channel, is embedded with a second lip-shaped sealing ring with a lip opening facing the channel;

the inner wall of the second lip-shaped sealing ring is in rotary sealing fit with the outer wall of the shaft rod.

In one embodiment of the present disclosure, the air vent valve further comprises a signal feedback mechanism for feeding back the state of the air vent valve;

the signal feedback mechanism is connected to the shell below the channel and is positioned at one side of the transmission mechanism.

In one embodiment of the disclosure, the signal feedback mechanism comprises a micro switch, a switch elastic piece, an adjusting block, an adjusting screw and a dust cover;

the micro switch and the dust cover are respectively and fixedly connected with the shell, the micro switch is arranged in the dust cover, the switch elastic sheet is connected with the micro switch, the adjusting block is fixedly connected with the shaft rod, and the adjusting screw is in threaded connection with the adjusting block;

the adjusting screw synchronously rotates along with the shaft lever, and the head part of the adjusting screw can press the switch elastic sheet to deform the switch elastic sheet.

In one embodiment of the present disclosure, a pointer is fixedly connected to one end of the shaft rod, which is far away from the signal feedback mechanism;

the shell is carved with an on word and an off word corresponding to the pointer.

In one embodiment of the disclosure, the housing below the channel is provided with an electrical connector plug for externally connecting to a power source;

the electric connector plug is electrically connected with the electromagnetic valve through a conduit containing a plurality of first wires;

the micro switch is electrically connected with the electric connector plug through a plurality of second wires.

Compared with the prior art, the application has the beneficial effects that:

1. the volume of the reset cavity is changed by switching on and off the electromagnetic valve, and the butterfly plate is driven to rotate by the transmission mechanism to control the opening and closing of the channel (the valve), so that the condition that the butterfly plate cannot be opened or closed is avoided, the surge of an engine is avoided, and the life safety of a pilot is effectively ensured; compared with the deflation valve with a bellows structure, the electronic control mode is faster in response and more accurate in control, and the working reliability of the deflation valve is greatly improved.

2. The spring washers are added at the two ends of the return spring, so that the rotation torque generated by the fact that the return spring is driven to rotate by the installation sealing cover to the piston can be effectively reduced, and the eccentric wear condition of the crank-connecting rod mechanism is relieved.

3. The lining can improve the wear resistance of the shell made of cast aluminum alloy, and the elastic expansion sleeve can be well attached to the lining through the action of self elastic force when the butterfly plate is closed to form a sand prevention structure, so that sand is prevented from entering into a gap between the butterfly plate and the channel, the problem that the existing air release valve cannot work normally under the working condition that the engine is in a sand environment is solved, the environmental adaptability of the air release valve is greatly improved, and the working reliability of the engine in a severe environment is improved.

4. The second lip-shaped sealing ring can be well tightly attached to the outer wall of the shaft rod and the inner wall of the mounting hole under the action of the self elastic supporting ring, sand dust in the channel is prevented from entering the bearing through gaps between the shaft rod and the mounting hole to cause bearing clamping stagnation, and when the air release valve works, the inner lip and the outer lip of the second lip-shaped sealing ring can be relatively expanded under the action of pressure to be tightly attached to the outer wall of the shaft rod and the inner wall of the mounting hole, so that the sand prevention capability of the air release valve is further enhanced, and the working reliability of the air release valve in the sand dust environment is improved.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the application, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

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

FIG. 2 is a schematic view of a left-hand cross-sectional structure of the present application;

FIG. 3 is a schematic perspective view of the connection of the inside of the transmission mechanism to the butterfly plate;

FIG. 4 is a schematic top view of FIG. 3;

FIG. 5 is a schematic simplified diagram of the present application in a closed state;

FIG. 6 is a schematic simplified diagram of the open state of the present application;

FIG. 7 is a schematic cross-sectional structural view of the solenoid valve;

FIG. 8 is a schematic cross-sectional view of the transmission;

FIG. 9 is a schematic view of the structure of the channel when opened in accordance with the present application;

FIG. 10 is an enlarged view of part A of FIG. 9;

FIG. 11 is a schematic view of the structure of the channel when the application is closed;

fig. 12 is a schematic cross-sectional view of a signal feedback mechanism.

Detailed Description

Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 12, the present application provides an electrically controlled air release valve comprising:

a housing 100 provided with a channel 110 and an air passage 120 positioned at the periphery of the channel 110;

a butterfly plate 200 rotatably connected to the inside of the passage 110 for opening and closing the passage 110;

a support 300 fixedly connected to the housing 100 above the channel 110 and provided with a P capable of communicating with one end of the air passage 120 ₃ An air inlet 310;

solenoid valve 400 fixedly mounted to support 300 for controlling P ₃ Inlet 310 is on-off with airway 120; and

The transmission mechanism 500 is fixedly arranged on the shell 100 below the channel 110 and connected with the butterfly plate 200, and is provided with a gas-collecting cavity 501 communicated with the other end of the air channel 120;

wherein, after the electromagnetic valve 400 is electrified, the gas is formed by P ₃ The air inlet 310 is introduced into the air collecting chamber through the air passage 120 to increase the volume thereof, so that the butterfly plate 200 rotates to close the passage 110; after the solenoid valve 400 is powered off, the gas in the gas collecting chamber is discharged through the gas passage 120 through the gas outlet 402 of the solenoid valve 400 to reduce the volume thereof, so that the butterfly plate 200 reversely rotates to open the passage 110.

Specifically, the air passage 120 is disposed inside the housing 100 around the channel 110, and the butterfly plate 200 is disposed at the air inlet end of the channel 110 (i.e., the compressor P _2.5 The side of the exhaust inlet), the support 300 is fixedly connected with the housing 100 above the air outlet end of the channel 110 through a first screw, the electromagnetic valve 400 is fixedly connected with the support 300 through a second screw, and the transmission mechanism 500 is internally installed at the air outlet end of the channel 110 (i.e. the compressor P _2.5 The side on which the exhaust outlet is located) is placed in the housing 100.

P ₀ 、P _2.5 And P ₃ Are special terms in the technical field of engines, and belong to the prior art, so are not specifically explained herein.

Referring to fig. 2, the housing 100 below the channel 110 is provided with a chamber 130 having an axis perpendicular to the channel 110; referring to fig. 3 to 6, the transmission mechanism 500 includes a guide post 510 with a sealing plate, a piston 520, a connecting rod 530, a rocker arm 540, a return spring 550 and a sealing cover 560, the sealing plate and the sealing cover 560 are respectively and hermetically connected to the housing 100 at two ends of the cavity 130, the inner wall of the piston 520 is hermetically and slidingly sleeved on the guide post 510, the outer wall of the piston is hermetically and slidingly matched with the cavity 130 to divide the cavity 130 into a gas-collecting cavity and a return cavity, the piston 520, the connecting rod 530 and the rocker arm 540 are sequentially connected to form a crank-link mechanism, one end of the rocker arm 540, which is far away from the crank-link mechanism, is fixedly connected with the shaft lever 210 of the butterfly plate 200, and the return spring 550 is positioned in the return cavity and is in abutting connection between the piston 520 and the sealing cover 560. Referring to fig. 7, after the electromagnetic valve 400 is energized, under the electromagnetic force of the coil 410, the armature 420 is attracted, the valve core 450 is driven by the ejector rod 430 and the cushion block 440 to move against the elastic force of the main spring 460, the sealing block 470 is separated from the valve body 480, the electromagnetic valve 400 is switched from the normally closed state to the open state, and P ₃ The air inlet 310 is communicated with the air passage 120 through the electromagnetic valve air inlet 401, and at the moment, the external control air passes through P ₃ The air inlet 310 enters, flows through the electromagnetic valve air inlet 401 and the air channel 120, then fills the air gathering cavity and builds pressure, when the thrust of the pressure pushing piston 520 overcomes the elastic force of the return spring 550, the piston 520 moves, the air gathering cavity volume increases, the return cavity volume decreases, the crank link mechanism acts, and the butterfly plate 200 is rotated to the closed state of the channel 110 through the shaft lever 210At this time, the compressor P _2.5 Is blocked from being discharged to the atmosphere (see fig. 5 for details); when the electromagnetic valve 400 is powered off, the electromagnetic force of the coil 410 disappears, the valve core 450 is restored under the action of the elastic force of the main spring 460, the sealing block 470 is attached to the valve body 480 again and sealed, the electromagnetic valve 400 is closed, and P ₃ Intake port 310 is blocked from airway 120 to block P ₃ Air is introduced, air in the air gathering cavity is discharged to the atmosphere through the air outlet 402 of the electromagnetic valve 400, the pressure of the air gathering cavity is reduced to 0, the piston 520 moves under the action of the elastic force of the return spring 550, the volume of the air gathering cavity is reduced, the volume of the return cavity is increased, the butterfly plate 200 is driven to rotate to the opening state of the channel 110 through the crank connecting rod mechanism, and the air compressor P is in the opening state of the channel 110 _2.5 Excess gas exits the engine through passage 110 (see FIG. 6 for details). The crank link mechanism has an advantage in that even if the rotating sleeve of the link 530 is worn, it is not locked and the butterfly plate 200 cannot be opened or closed. That is, the volume of the reset cavity is changed by switching on and off the electromagnetic valve 400, and the butterfly plate 200 is driven to rotate by the transmission mechanism 500 to control the opening and closing of the channel 110 (the valve), so that the condition that the butterfly plate 200 cannot be opened or closed is avoided, the surge of an engine is avoided, and the life safety of a pilot is effectively ensured; compared with the deflation valve with a bellows structure, the electronic control mode is faster in response and more accurate in control, and the working reliability of the deflation valve is greatly improved.

Referring to fig. 8, the piston 520 has a large end and a small end, a blind hole extending from the large end to the small end is formed in the middle of the piston 520, and the inner wall of the blind hole is sealed and sleeved on the guide post 510 in a sliding manner; the outer circumferential surface of the large end of the piston 520 is in sealing and sliding fit with the inner wall of the cavity 130 through a first lip-shaped sealing ring 521, the area between one side surface of the large end of the piston 520 and the sealing plate is a gas collecting cavity, and the area between the other side surface and the sealing cover 560 is a resetting cavity; the side of the small end of the piston 520, which is away from the large end of the piston 520, is provided with an annular groove, the sealing cover 560 is provided with an annular boss corresponding to the annular groove, and two ends of the return spring 550 are respectively in abutting connection between the annular groove and the annular boss through the spring washer 551. That is, the spring washers 551 are added at the two ends of the return spring 550, so that the rotation torque generated by the installation of the cover 560 to drive the return spring 550 to rotate on the piston 520 can be effectively reduced, and the eccentric wear condition of the crank-link mechanism is relieved.

The support 300 is internally provided with a filter element 320 and a throttling plate 330, and the filter element 320 and the throttling plate 330 are sequentially arranged at P ₃ Downstream of the air inlet 310 (see fig. 5 and 6 for details). P can be improved by the filter element 320 and the throttling plate 330 ₃ Cleanliness and control P of intake air ₃ Flow rate of intake air.

Referring to fig. 9 to 11, a bushing 111 is inlaid on the inner wall of the housing 100 at the position where the channel 110 is matched with the butterfly plate 200, and an elastic expansion sleeve 220 is arranged on the outer ring of the butterfly plate 200; when the butterfly plate 200 is in the closed state, the elastic expansion sleeve 220 is tightly attached to the lining 111 to form a sand prevention structure. The lining 111 can improve the wear resistance of the shell 100 made of cast aluminum alloy, and the elastic expansion sleeve 220 can be well attached to the lining 111 through the action of self elastic force when the butterfly plate 200 is closed to form a sand prevention structure, so that sand and dust are prevented from entering into a gap between the butterfly plate 200 and the channel 110, the problem that the existing air release valve cannot work normally under the working condition that the engine is in a sand and dust environment is solved, the environmental adaptability of the air release valve is greatly improved, and the working reliability of the engine under the severe environment is improved. In this embodiment, the bushing 111 is a stainless steel bushing. The stainless steel bushing has better wear resistance.

At present, a certain turboshaft engine is assembled with the sand prevention structure and completes an engine sand swallowing test, and in the test process, the product works well without faults such as clamping stagnation, delayed opening and closing and the like. The sand control structure may adjust the materials of the liner 111 and the elastic expansion sleeve 220 according to different usage requirements (temperature, pressure, etc.), or make fine adjustments in structure.

The two ends of the shaft lever 210 are rotatably connected to the mounting holes formed in the housing 100 through bearings 230, the inner wall of one end of the mounting hole, which is close to the channel 110, is embedded with a second lip-shaped sealing ring 240 with a lip facing into the channel 110, and the inner wall of the second lip-shaped sealing ring 240 is rotatably and hermetically matched with the outer wall of the shaft lever 210. The second lip seal 240 can be well attached to the outer wall of the shaft rod 210 and the inner wall of the mounting hole under the action of the elastic support ring, sand dust in the channel 110 is prevented from entering the bearing 230 through gaps between the shaft rod 210 and the mounting hole to cause the clamping stagnation of the bearing 230, and when the air release valve works, the inner lip and the outer lip of the second lip seal 240 can be relatively expanded under the action of pressure to be attached to the outer wall of the shaft rod 210 and the inner wall of the mounting hole more tightly, so that the sand prevention capability of the air release valve is further enhanced, and the working reliability of the air release valve in the sand dust environment is improved.

Referring to fig. 12, the above-mentioned electrically controlled air release valve further includes a signal feedback mechanism 600 for feeding back the opening and closing state of the air release valve, and the signal feedback mechanism 600 is connected to the housing 100 below the channel 110 and located at one side of the transmission mechanism 500.

Specifically, the signal feedback mechanism 600 includes a micro switch 610, a switch spring 620, an adjusting block 630, an adjusting screw 640, and a dust cover 650; the micro switch 610 and the dust cover 650 are respectively and fixedly connected with the shell 100, the micro switch 610 is arranged in the dust cover 650, the switch elastic sheet 620 is connected with the micro switch 610, the adjusting block 630 is fixedly connected with the shaft lever 210, and the adjusting screw 640 is in threaded connection with the adjusting block 630; the adjusting screw 640 rotates synchronously with the shaft 210, and the head thereof can press the switch elastic piece 620 to deform it. When the air release valve is closed, the adjusting screw 640 rotates under the drive of the shaft lever 210 and is deformed by pressing the switch elastic sheet 620 by the head, and the micro switch 610 is triggered, so that a signal that the air release valve is in a closed state is fed back; in contrast, the set screw 640 disengages the switch dome 620 and the microswitch 610 is not triggered, at least indicating that the deflation valve is in an unoccluded (half open or open) state.

To directly reflect the opening and closing state of the air release valve from the external appearance, a pointer 250 is fixedly connected to one end of the shaft rod 210 away from the signal feedback mechanism 600, and the housing 100 is carved with "on" and "off" words corresponding to the pointer 250 (see fig. 1 for details). That is, by pointing the pointer 250 to the word "on" or "off", the open/close state of the passage 110 (butterfly plate 200 position) can be indicated, thereby directly reflecting the open/close state of the air release valve.

Referring to fig. 1 and 12, the housing 100 below the channel 110 is provided with an electrical connector plug 140 for externally connecting to a power source (not shown), the electrical connector plug 140 is electrically connected to the solenoid valve 400 through a conduit 150 containing a plurality of first wires 151, and the micro switch 610 is electrically connected to the electrical connector plug 140 through a plurality of second wires 152.

In this embodiment, the first conductive wire 151 and the second conductive wire 152 are both high-temperature conductive wires (the working temperature is between-65 ℃ and +200 ℃), and a plurality of the first conductive wires and the second conductive wires are bundled together by a bundling belt.

In summary, the application solves the problem of high failure rate of the external field of the bellows type air release valve in an electric control mode, improves the overall response speed and reliability of the air release valve, has sand prevention capability, and solves the problem that the air release valve with the existing structure is easy to be blocked in the sand environment.

The above embodiments are only preferred embodiments of the present application, and are not limiting to the technical solutions of the present application, and any technical solution that can be implemented on the basis of the above embodiments without inventive effort should be considered as falling within the scope of protection of the patent claims of the present application.

Claims

1. An electrically controlled bleed valve, comprising:

wherein after the electromagnetic valve is electrified, the gas is discharged from the P ₃ The air inlet is filled into the air collecting cavity through the air passage to increase the volume of the air collecting cavity, so that the butterfly plate rotates to close the passage; after the electromagnetic valve is powered off, the gas in the gas collecting cavity is discharged through the gas channel through the gas outlet of the electromagnetic valve toReducing its volume so that the butterfly plate rotates in opposite directions to open the passage.

2. The electrically controlled deflation valve of claim 1, wherein:

the shell below the channel is provided with a chamber with an axis perpendicular to the channel;

3. The electrically controlled deflation valve of claim 2, wherein:

the piston is provided with a large end and a small end, a blind hole extending from the large end to the small end is formed in the middle of the piston, and the inner wall of the blind hole is sealed and sleeved on the guide post in a sliding manner;

4. An electrically controlled air bleed valve according to any one of claims 1 to 3, wherein:

the support is internally provided with a filter element and a throttling sheet;

5. The electrically controlled deflation valve of claim 2, wherein:

a lining is inlaid on the inner wall of the shell at the joint of the channel and the butterfly plate, and an elastic expansion sleeve is arranged on the outer ring of the butterfly plate;

6. An electrically controlled deflating valve according to claim 2 or 5, characterised in that:

the two ends of the shaft lever are rotationally connected with the mounting holes formed in the shell through bearings;

7. The electrically controlled deflation valve of claim 2, wherein:

the device also comprises a signal feedback mechanism for feeding back the state of the air release valve switch;

8. The electrically controlled deflation valve of claim 7, wherein:

the signal feedback mechanism comprises a micro switch, a switch elastic sheet, an adjusting block, an adjusting screw and a dust cover;

9. An electrically controlled deflating valve according to claim 7 or 8, characterised in that:

one end of the shaft lever, which is far away from the signal feedback mechanism, is fixedly connected with a pointer;

10. The electrically controlled deflation valve of claim 8, wherein:

an electric connector plug for externally connecting with a power supply is arranged on the shell below the channel;