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.
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.