CN112503216A - Normally closed gas circuit control valve - Google Patents
Normally closed gas circuit control valve Download PDFInfo
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- CN112503216A CN112503216A CN202010890891.8A CN202010890891A CN112503216A CN 112503216 A CN112503216 A CN 112503216A CN 202010890891 A CN202010890891 A CN 202010890891A CN 112503216 A CN112503216 A CN 112503216A
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- bushing
- sealing ring
- ejector rod
- valve body
- normally closed
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- 238000007789 sealing Methods 0.000 claims abstract description 107
- 230000009471 action Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/14—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by one actuating member, e.g. a handle
- F16K11/16—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by one actuating member, e.g. a handle which only slides, or only turns, or only swings in one plane
- F16K11/161—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by one actuating member, e.g. a handle which only slides, or only turns, or only swings in one plane only slides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/36—Interlocking devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0263—Construction of housing; Use of materials therefor of lift valves multiple way valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
本发明提供了一种常闭式气路控制阀，包括阀体、第一衬套、顶杆、阀芯、第一弹簧、第二弹簧、第一密封圈以及第二密封圈。第一衬套设置在阀体内的一端，顶杆设置在阀体内的另一端，其中，第一衬套上设置有进气孔、出气孔及进气通道。阀芯和第一弹簧配合安装在第一衬套内，使阀芯上的第一密封圈与第一衬套的内壁紧密接触。从初始状态切换为最终状态时，首先驱动顶杆移动，在顶杆与第二密封圈紧密接触时，排气通道关闭，顶杆继续移动，直至顶杆与阀芯抵接并驱动阀芯移动，以打开进气通道，并且排气通道关闭。本发明的常闭式气路控制阀在打开进气通道之前会切断排气通道，控制精度较高，解决了相关技术中阀体控制精度低而造成安全隐患的问题。
The invention provides a normally closed gas circuit control valve, which comprises a valve body, a first bushing, a push rod, a valve core, a first spring, a second spring, a first sealing ring and a second sealing ring. The first bushing is arranged at one end of the valve body, and the push rod is arranged at the other end of the valve body, wherein the first bushing is provided with an air inlet hole, an air outlet hole and an air inlet passage. The valve core and the first spring are fitted in the first bushing, so that the first sealing ring on the valve core is in close contact with the inner wall of the first bushing. When switching from the initial state to the final state, the ejector rod is first driven to move. When the ejector rod is in close contact with the second sealing ring, the exhaust passage is closed, and the ejector rod continues to move until the ejector rod abuts against the valve core and drives the valve core to move. , to open the intake passage, and the exhaust passage closes. The normally closed air path control valve of the present invention cuts off the exhaust passage before opening the intake passage, and has high control precision, which solves the problem of the low control precision of the valve body in the related art and the potential safety hazard.
Description
Technical Field
The invention relates to the field of manual transmission control, in particular to air passage control of a manual transmission of a commercial automobile, and particularly relates to a normally closed air passage control valve.
Background
The manual transmission is an important part of a vehicle, can change the transmission ratio, and expand the torque and the rotating speed of a driving wheel so as to adapt to the frequently changing running condition, and simultaneously, the engine can work under the favorable working condition (higher power and lower oil consumption). The driver controls the gearbox through the control rod, so that the gear can be switched between high and low gears.
A main box gearbox and an auxiliary box gearbox are arranged on the commercial vehicle. When the rear auxiliary box shifts gears, an air source needs to be provided for a stop valve of the main box so as to ensure that the main box realizes locking protection in the gear shifting process of the auxiliary box, and the air source is usually controlled to be switched on and off by an air path control valve. However, in the shifting process of the gas circuit control valve in the related art, the control accuracy is low, and the requirement of the practical application environment cannot be met, so that some uncertain potential safety hazards can be generated in the driving process.
Aiming at the problem that the control precision of a gas circuit control valve in the related technology is low in the gear shifting process, an effective solution is not provided at present.
Disclosure of Invention
In order to solve the problems, the invention provides a normally closed gas circuit control valve.
The invention provides a normally closed gas circuit control valve, which comprises:
a valve body;
the first bushing is arranged at one end in the valve body, an air inlet hole, an air outlet hole and an air inlet channel are formed in the first bushing, and the air inlet channel is communicated with the air inlet hole and the air outlet hole;
the first end of the ejector rod extends out of the valve body from the inner edge of the valve body, the ejector rod can move along the axial direction of the ejector rod under the drive of an external component, and the second end of the ejector rod is close to the first lining;
the valve core is movably arranged in the first bushing, and a first sealing ring is arranged on the outer side of the valve core;
the first spring is movably arranged in the first bushing and is matched with the valve core, so that a first sealing ring on the valve core is tightly contacted with the inner wall of the first bushing to close the air inlet channel;
the second sealing ring is arranged on the inner wall of the first bushing and is positioned between the air outlet hole and the air outlet of the valve body, and when the ejector rod moves upwards or downwards along the axial direction, the second sealing ring is in close contact with or separated from the ejector rod so as to close or open an air outlet channel between the air outlet hole and the air outlet of the valve body;
the second spring is sleeved on the second end of the ejector rod and is abutted to the first bushing;
in an initial state, under the action of the first spring, the first sealing ring is in close contact with the inner wall of the first lining, the air inlet channel is closed, the second sealing ring is separated from the ejector rod, and the exhaust channel is opened;
in the middle state, the external component drives the ejector rod to move upwards, so that the ejector rod is in close contact with the second sealing ring, the exhaust channel is closed, the first sealing ring is still in close contact with the first lining, and the air inlet channel is kept closed;
in the final state, the external component drives the ejector rod to continuously move upwards until the ejector rod is abutted to the valve core and drives the valve core to move upwards, so that the first sealing ring and the inner wall of the first lining are separated from each other, and the air inlet channel is opened.
Preferably, a first sealing conical surface is arranged on the inner wall of the first bushing, the first sealing conical surface is located between the air inlet hole and the air outlet hole, and the first sealing conical surface and the first sealing ring are separated from each other or are in close contact with each other to open or close the air inlet channel.
Preferably, a second sealing conical surface is arranged at the second end of the ejector rod, and when the ejector rod moves upwards or downwards, the second sealing conical surface and the second sealing ring are in close contact or separated from each other so as to close or open the exhaust channel between the air outlet and the exhaust port.
Preferably, the valve core comprises a body and a positioning sleeve extending outwards from the body, the first sealing ring is arranged outside the body, one end of the first spring is accommodated in the positioning sleeve, and the other end of the first spring abuts against the inner wall of the valve body.
Preferably, the method further comprises the following steps:
and the second bushing is abutted between the first bushing and the second spring, and the second bushing and the first bushing are mutually matched to form a groove for accommodating the second sealing ring.
Preferably, the air inlet and the air outlet are arranged on the outer wall of the first bushing, and the air inlet and the air outlet are arranged on the outer wall of the first bushing.
Preferably, the method further comprises the following steps:
a fourth seal ring received in a groove in an outer wall of the second liner.
Preferably, the method further comprises the following steps:
and the fifth sealing ring is arranged on the outer side of the ejector rod and is positioned at the first end of the ejector rod.
Preferably, the method further comprises the following steps:
the valve cover is fixedly arranged on the valve body and is abutted against the first bushing;
and the sixth sealing ring is arranged between the first bushing and the valve body and is in close contact with the first bushing, the valve body and the valve cover.
Preferably, the valve body is further provided with an air inlet, a working port and an air outlet, the air inlet is communicated with the air inlet, the working port is communicated with the air outlet, and the air outlet is communicated with the air exhaust channel;
and the exhaust port is provided with an exhaust plug.
The invention provides a normally closed gas circuit control valve which comprises a valve body, a first bushing, a mandril, a valve core, a first spring, a second spring, a first sealing ring and a second sealing ring. The first bushing is arranged at one end in the valve body, the ejector rod is arranged at the other end in the valve body, and an air inlet hole, an air outlet hole and an air inlet channel are formed in the first bushing. The valve core and the first spring are arranged in the first bushing in a matching mode, and a first sealing ring on the valve core is in close contact with the inner wall of the first bushing. When the initial state is switched to the final state, the ejector rod is driven to move upwards firstly, when the ejector rod is in close contact with the second sealing ring, the exhaust channel is closed, then the ejector rod continues to move until the ejector rod is abutted to the valve core and drives the valve core to move, the air inlet channel is opened, and meanwhile, the exhaust channel is closed.
According to the normally closed gas circuit control valve, the valve body is internally designed in a sectional structure, the exhaust channel is cut off before the air inlet channel is opened, accurate control can be provided for a gearbox of a commercial vehicle, and the problem of potential safety hazards caused by low valve body control accuracy in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic structural diagram of a normally closed gas circuit control valve according to an embodiment of the present invention, wherein the normally closed gas circuit control valve is in an initial state;
fig. 2 is a schematic structural diagram of a normally closed gas path control valve according to an embodiment of the present invention, wherein the normally closed gas path control valve is in an intermediate state;
fig. 3 is a schematic structural diagram of a normally closed gas circuit control valve according to an embodiment of the present invention, wherein the normally closed gas circuit control valve is in a final state;
fig. 4 is a schematic structural view of a first bushing according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In this embodiment, the push rod of the air passage control valve may be connected to the transmission shaft, and the push rod may move upward along the axial direction thereof under the driving of the transmission shaft.
Fig. 1 is a schematic structural diagram of a normally closed gas circuit control valve according to an embodiment of the present invention, and as shown in the drawing, the normally closed gas circuit control valve 1 includes a valve body 11, a first bushing 12, a plunger 13, a valve core 14, a first spring 15, a second spring 16, a first sealing ring 141, and a second sealing ring 124. The first bush 12 is provided at one end in the valve body 11, and the stem 13 is movably provided at the other end in the valve body 11. The first liner 12 is provided with an air inlet hole 121, an air outlet hole 122, and an air inlet passage 123 communicating the air inlet hole 121 and the air outlet hole 122. The first end of the push rod 13 extends from the inside of the valve body 11 to the outside of the valve body 11, the push rod 13 can move along the axial direction thereof under the driving of the external component, and the second end of the push rod 13 is close to the first lining 12. The valve element 14 is movably disposed in the first liner 12, and a first seal ring 141 is disposed outside the valve element 14. The first spring 15 and the valve core 14 are both disposed in the first bushing 12, and the first spring 15 and the valve core 14 are mutually matched, so that the first sealing ring 141 on the valve core 14 is in close contact with the inner wall of the first bushing 12 to close the air inlet passage 123. The second sealing ring 124 is disposed on the inner wall of the first bushing 11 and located between the air outlet hole 122 and the air outlet of the valve body, and when the ejector rod 13 moves upward or downward along the axial direction, the second sealing ring 124 is in close contact with or separated from the ejector rod 13 to close or open the air outlet passage between the air outlet hole 122 and the air outlet of the valve body. The second spring 16 is sleeved on the second end of the push rod 13 and abuts against the first bushing 12, so that the push rod 13 and the second sealing ring 124 of the first bushing 12 are separated from each other.
The working state of the normally closed gas path control valve provided by the above embodiment is as follows:
in an initial state, under the action of the first spring 15, the first sealing ring 141 is in close contact with the inner wall of the first bushing 12, the air inlet channel is closed, the second sealing ring 124 is separated from the ejector rod 13, and the air outlet channel is opened;
in the intermediate state, the external component drives the push rod 13 to move upwards, so that the push rod 13 is in close contact with the second sealing ring 124, the exhaust passage is closed, and meanwhile, the first sealing ring 141 is still in close contact with the inner wall of the first bushing 12, namely, the air inlet passage is kept closed;
in the final state, the external component drives the ejector rod 13 to continue moving upwards until the ejector rod 13 abuts against the valve core 14 and drives the valve core 14 to move upwards, so that the first sealing ring 141 and the inner wall of the first bushing 12 are separated from each other, and the air inlet channel is opened.
The normally closed gas circuit control valve that this embodiment provided adopts the design of sectional type structure in the valve body, can cut off exhaust passage before opening inlet channel, and each work break-make point is clear, can promote the correspondence and the work efficiency of whole valve to be applied to effectively in the pneumatic circuit of main tank and back auxiliary tank interlocking, for the commercial car gearbox provides accurate control, prevent that the auxiliary tank from switching the in-process, because control accuracy is low and cause some driving safety hidden dangers.
As a preferred embodiment, the inner wall of the first bushing 12 is provided with a first sealing conical surface, and the first sealing conical surface is located between the air inlet hole 121 and the air outlet hole 122, when in operation, the push rod 13 drives the valve element 14 to move upwards or downwards, that is, drives the first sealing ring 141 on the valve element 14 to move upwards or downwards, so that the first sealing conical surface and the first sealing ring are separated from or in close contact with each other, and the air inlet channel is opened or closed.
As a preferred embodiment, the second end of the push rod 13 is provided with a second sealing conical surface, so that when the push rod 13 moves upwards or downwards, the second sealing conical surface and the second sealing ring are in close contact or separated from each other, thereby closing the exhaust passage between the air outlet and the exhaust port.
In the above embodiment, the sealing between the first bushing 12 and the first sealing ring 141 is implemented by conical surface sealing, and the ejector rod 13 and the second sealing ring 124 are also implemented by conical surface sealing, the sealing structure has a unique design, is firm and reliable, can effectively delay the abrasion of the sealing element in the valve body, and the practical test and use data also show that the cover sealing structure can greatly prolong the service life of the product. Meanwhile, the sealing gasket has better vibration resistance and sealing performance under high and low temperature states.
As a preferred embodiment, the valve body 14 includes a main body 142 and a positioning sleeve 143 extending outward from the main body 142, the first seal ring 141 is disposed outside the main body 142, one end of the first spring 15 is accommodated in the positioning sleeve 143, and the other end of the first spring 15 abuts against an inner wall of the valve body. In the preferred embodiment, the positioning sleeve can provide a guiding function for the first spring, so as to prevent the first spring from being in a dislocation state in the compression process.
As another preferred embodiment, the normally closed type air passage control valve may further include a second bushing 17, the second bushing 17 abuts between the first bushing 12 and the second spring 16, the second bushing 17 and the first bushing 12 cooperate with each other to form a groove, and the second sealing ring 124 is fixedly disposed in the groove.
In the above embodiment, the first bush and the second bush are fitted to each other. It should be noted that, other similar or identical combinations may be adopted by those skilled in the art to form the groove for accommodating the second sealing ring according to the requirements of the practical application.
As a preferred embodiment, the normally closed air passage control valve may further include a third sealing ring 125, and the third sealing ring 125 is received in a groove on the outer wall of the first liner 12 and is located between the air inlet hole 121 and the air outlet hole 122, so as to ensure that the sealing between the valve body 11 and the first liner 12 is maintained.
As a preferred embodiment, the normally closed type air passage control valve may further include a fourth sealing ring 171, and the fourth sealing ring 171 is received in a groove of an outer wall of the second bushing, so that the sealing between the valve body 11 and the second bushing 17 is maintained.
As a preferred embodiment, the normally closed air path control valve may further include a fifth sealing ring 131 disposed outside the top rod 13 and located at the first end of the top rod 13. The fifth sealing ring keeps the sealing between the valve body and the ejector rod, and the requirement for sealing the inside of the valve body is met.
As a preferred embodiment, the normally closed gas circuit control valve may further include a valve cover 18 and a sixth sealing ring 181, the valve cover 18 is fixedly disposed on the valve body 11 and abuts against the first bushing 12, as shown in the figure, the sixth sealing ring 181 is disposed on the outer side between the first bushing 12 and the valve body 11, and the sixth sealing ring is in close contact with the first bushing, the valve body and the valve cover, so that the valve cover and the valve body and the first bushing are simultaneously kept sealed, and the requirement for sealing inside the valve body is ensured to be met.
As a preferred embodiment, the valve body 11 is further provided with an air inlet a, a working port B and an air outlet C, the air inlet a is communicated with the air inlet 121, the working port B is communicated with the air outlet 122, the air outlet C is communicated with the air outlet channel, and more preferably, the air outlet C is further provided with an air exhaust plug 19. The exhaust valve 19 can effectively prevent foreign substances from entering the valve body 11 through the exhaust port 19.
The operation principle of the normally closed gas path control valve in the above embodiment will be described in detail below.
The normally closed gas circuit control valve shown in fig. 1 is in an initial state, and the auxiliary box is in low-grade or high-grade operation correspondingly at the moment. In the initial state, the ejector rod 13 is in the initial position under the action of the second spring 16, so that the ejector rod 13 and the sealing assembly of the second sealing ring 124 are separated from each other, the exhaust passage between the working port B and the exhaust port C is opened, and meanwhile, the valve core 14 is in the initial position under the action of the first spring 15, so that the first sealing ring 141 is in close contact with the first sealing conical surface in the first bushing 11, and the intake passage from the intake port a to the working port B is closed.
The normally closed air passage control valve shown in fig. 2 is in an intermediate state, at this time, the rear sub-tank starts to switch from a low gear to a high gear or from a high gear to a low gear correspondingly, the rear sub-tank shaft drives the push rod 13 to overcome the acting force of the second spring 16, so that the push rod 13 starts to move upwards, when the push rod 13 is in close contact with the second sealing ring 124, the exhaust passage between the working port B and the exhaust port C is closed, meanwhile, the first sealing ring 141 is still in close contact with the first sealing conical surface on the first bushing 12, that is, the air inlet passage between the air inlet a and the working port B is closed, and the exhaust passage between the working port B and the exhaust port C is also closed.
The normally closed pneumatic control valve shown in fig. 3 is in the final state, in which the rear sub-tank is fully switched to the in-stage position, respectively. In a final state, the ejector rod 13 overcomes the action of the second spring 16 under the driving of the rear auxiliary box shaft and continues to move upwards to an end position, at the moment, a sealing surface between the ejector rod and the second sealing ring is completely closed, the ejector rod 13 abuts against the valve core 14 and drives the valve core 14 to move upwards, so that the first lining and the first sealing ring are separated from each other, namely, an air inlet channel between the air inlet A and the working port B is opened, and an air outlet channel between the working port B and the air outlet C is closed.
In summary, the normally closed gas path control valve provided by the invention comprises a valve body, a first bushing, a mandril, a valve core, a first spring, a second spring, a first sealing ring and a second sealing ring. The first bushing is arranged at one end in the valve body, the ejector rod is arranged at the other end in the valve body, and an air inlet hole, an air outlet hole and an air inlet channel are formed in the first bushing. The valve core and the first spring are arranged in the first bushing in a matching mode, and a first sealing ring on the valve core is in close contact with the inner wall of the first bushing. When the initial state is switched to the final state, the ejector rod is driven to move upwards firstly, when the ejector rod is in close contact with the second sealing ring, the exhaust channel is closed, then the ejector rod continues to move until the ejector rod is abutted to the valve core and drives the valve core to move, the air inlet channel is opened, and meanwhile, the exhaust channel is closed.
According to the normally closed gas circuit control valve, the design of a sectional structure is adopted in the valve body, the exhaust channel is cut off before the air inlet channel is opened, the on-off points of all work are clear, the corresponding performance and the working efficiency of the whole valve can be improved, and therefore the normally closed gas circuit control valve is effectively applied to a pneumatic circuit with the interlocking main box and the rear auxiliary box, can provide accurate control for a transmission case of a commercial vehicle, and solves the problem of potential safety hazard caused by low valve body control accuracy in the related technology.
It should be noted that these technical effects are not possessed by all the embodiments described above, and some technical effects are obtained only by some preferred embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A normally closed gas circuit control valve is characterized by comprising
A valve body;
the first bushing is arranged at one end in the valve body, an air inlet hole, an air outlet hole and an air inlet channel are formed in the first bushing, and the air inlet channel is communicated with the air inlet hole and the air outlet hole;
the first end of the ejector rod extends out of the valve body from the inner edge of the valve body, the ejector rod can move along the axial direction of the ejector rod under the drive of an external component, and the second end of the ejector rod is close to the first lining;
the valve core is movably arranged in the first bushing, and a first sealing ring is arranged on the outer side of the valve core;
the first spring is movably arranged in the first bushing and is matched with the valve core, so that a first sealing ring on the valve core is tightly contacted with the inner wall of the first bushing to close the air inlet channel;
the second sealing ring is arranged on the inner wall of the first bushing and is positioned between the air outlet hole and the air outlet of the valve body, and when the ejector rod moves upwards or downwards along the axial direction, the second sealing ring is in close contact with or separated from the ejector rod so as to close or open an air outlet channel between the air outlet hole and the air outlet of the valve body;
the second spring is sleeved on the second end of the ejector rod and is abutted to the first bushing;
in an initial state, under the action of the first spring, the first sealing ring is in close contact with the inner wall of the first lining, the air inlet channel is closed, the second sealing ring is separated from the ejector rod, and the exhaust channel is opened;
in the middle state, the external component drives the ejector rod to move upwards, so that the ejector rod is in close contact with the second sealing ring, the exhaust channel is closed, the first sealing ring is still in close contact with the first lining, and the air inlet channel is kept closed;
in the final state, the external component drives the ejector rod to continuously move upwards until the ejector rod is abutted to the valve core and drives the valve core to move upwards, so that the first sealing ring and the inner wall of the first lining are separated from each other, and the air inlet channel is opened.
2. The normally closed gas path control valve according to claim 1, wherein a first sealing tapered surface is provided on an inner wall of the first bushing, and the first sealing tapered surface is located between the gas inlet hole and the gas outlet hole, and the first sealing tapered surface and the first sealing ring are separated from each other or are in close contact with each other to open or close the gas inlet passage.
3. The normally closed gas path control valve according to claim 2, wherein a second sealing tapered surface is provided at the second end of the plunger, and when the plunger moves upward or downward, the second sealing tapered surface and the second sealing ring are in close contact with each other or are separated from each other, so as to close or open the exhaust passage between the gas outlet hole and the gas outlet.
4. The normally closed gas circuit control valve according to claim 1, wherein the valve element includes a body and a positioning sleeve extending outward from the body, the first seal ring is disposed outside the body, one end of the first spring is accommodated in the positioning sleeve, and the other end of the first spring abuts against an inner wall of the valve body.
5. The normally closed gas circuit control valve according to claims 1 to 4, further comprising:
and the second bushing is abutted between the first bushing and the second spring, and the second bushing and the first bushing are mutually matched to form a groove for accommodating the second sealing ring.
6. The normally closed gas path control valve according to claim 5, further comprising:
and the third sealing ring is accommodated in the groove on the outer wall of the first bushing and is positioned between the air inlet hole and the air outlet hole.
7. The normally closed gas path control valve according to claim 6, further comprising:
a fourth seal ring received in a groove in an outer wall of the second liner.
8. The normally closed gas path control valve according to claim 7, further comprising:
and the fifth sealing ring is arranged on the outer side of the ejector rod and is positioned at the first end of the ejector rod.
9. The normally closed gas path control valve according to any one of claims 1 to 4, further comprising:
the valve cover is fixedly arranged on the valve body and is abutted against the first bushing;
and the sixth sealing ring is arranged between the first bushing and the valve body and is in close contact with the first bushing, the valve body and the valve cover.
10. The normally closed gas circuit control valve according to claim 9, wherein the valve body is further provided with a gas inlet, a working port and a gas outlet, the gas inlet is communicated with the gas inlet, the working port is communicated with the gas outlet, and the gas outlet is communicated with the gas exhaust channel;
and the exhaust port is provided with an exhaust plug.
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| CN202010890891.8A CN112503216A (en) | 2020-08-29 | 2020-08-29 | Normally closed gas circuit control valve |
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| CN202010890891.8A CN112503216A (en) | 2020-08-29 | 2020-08-29 | Normally closed gas circuit control valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113531116A (en) * | 2021-06-12 | 2021-10-22 | 中国煤炭科工集团太原研究院有限公司 | Isolation protection device and control system based on hydraulic mechanical transmission |
| CN115182994A (en) * | 2022-06-27 | 2022-10-14 | 陕西法士特齿轮有限责任公司 | Interlocking integrated valve, gas circuit protection system and control method thereof |
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