Brake relay valve with enhanced sealing

Abstract

The utility model relates to a brake relay valve of enhanced sealing performance relates to relay valve technical field, adopt the technical scheme including valve body, the piston and first annular mounting seat of setting in the valve body, the piston outer wall is sequentially provided with two limit grooves along piston axial direction, two limit grooves all are provided with sealing ring, and two sealing rings are same in size, the piston is provided with the piston head that extends to the first annular mounting seat, the piston head is provided with the inner chamber that communicates with the first annular mounting seat inside, the piston still is provided with the air extraction channel, the air extraction channel one end communicates with the inner chamber, and the other end extends to the piston outer wall and is provided with the opening, and the opening is between two limit grooves, the utility model sets up two sealing rings between the piston and valve body and enhances sealing performance, avoids back gas, air leakage, and solves the problem of increasing sealing ring after row vacuum.

Description

Technical Field

[0001] This utility model relates to the field of relay valve technology, and in particular to a brake relay valve with enhanced sealing performance. Background Technology

[0002] The relay valve is part of the automotive air brake system. Its inlet connects to the air reservoir, its outlet connects to the brake chamber, and its control port connects to the brake valve. When the brake pedal is depressed, the output air pressure of the brake valve serves as the control pressure input to the relay valve. Under this control pressure, the piston descends, opening the inlet valve, allowing compressed air to enter the brake chamber directly from the air reservoir through the inlet and outlet. When the brake is released, the air pressure at the control port decreases, causing the piston to rise and close the inlet valve, while the exhaust valve opens, allowing gas to flow out through the exhaust port. However, in traditional relay valves, only a single sealing ring is typically installed between the piston and the valve body, resulting in poor sealing performance. During braking, air can easily backflow from the control port and leak from the exhaust port, posing a significant safety hazard. Utility Model Content

[0003] To address the problems of air backflow from the control port and air leakage from the exhaust port during braking in existing technologies, this invention provides a brake relay valve with enhanced sealing performance.

[0004] This utility model provides the following technical solution: a brake relay valve with enhanced sealing performance, comprising a valve body, a piston disposed within the valve body, and a first annular mounting seat. Two limiting grooves are sequentially arranged on the outer wall of the piston along the piston axial direction. A sealing ring is disposed in each of the two limiting grooves, and the two sealing rings are of the same size. The piston is provided with a piston head extending into the first annular mounting seat. The piston head is provided with an inner cavity communicating with the interior of the first annular mounting seat. The piston is also provided with an air extraction passage. One end of the air extraction passage communicates with the inner cavity, and the other end extends to the outer wall of the piston and is provided with an opening located between the two limiting grooves.

[0005] Preferably, a second annular mounting seat is provided inside the first annular mounting seat, and the second annular mounting seat is provided with an exhaust port. The first annular mounting seat, the second annular mounting seat, and the piston are coaxial.

[0006] Preferably, the piston has a protruding ridge on the side facing the first annular mounting seat, and the air extraction passage is disposed inside the protruding ridge.

[0007] Preferably, the valve body is further provided with an air inlet communicating with the interior of the first annular mounting seat, and two air outlets communicating with the external cavity of the first annular mounting seat; the valve body may also be detachably connected to a cover, the cover being provided with a control port communicating with the interior of the valve body.

[0008] The beneficial effects of this utility model are: two sealing rings are set between the piston and the valve body to enhance the sealing performance and prevent backflow and leakage; the piston is coaxial with the first and second annular mounting seats to improve concentricity and prevent the piston from tilting when moving; and an air extraction channel is set inside the piston to solve the problem of vacuuming the brake air circuit after adding sealing rings. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of one embodiment of a relay valve.

[0010] Figure 2 This is a top view of one embodiment of the valve body.

[0011] Figure 3 A cross-section of an embodiment of a relay valve Figure I .

[0012] Figure 4 A cross-section of an embodiment of a relay valve Figure II .

[0013] Figure 5 This is a schematic diagram of one embodiment of a piston.

[0014] Reference numerals: 10, valve body; 11, first annular mounting seat; 12, second annular mounting seat; 13, cavity; 14, exhaust port; 15, air inlet; 16, air outlet; 20, cover; 21, control port; 30, piston; 31, sealing ring; 32, piston head; 33, inner cavity; 34, protruding ridge; 35, air extraction passage. Detailed Implementation

[0015] The embodiments of this utility model will be described in more detail below with reference to the accompanying drawings and reference numerals, so that those skilled in the art can implement them after reading this specification. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0016] This utility model provides, for example Figure 1-5 The brake relay valve shown includes a valve body 10, a cover 20 detachably connected to the valve body 10, a piston 30 and a first annular mounting seat 11 disposed within the valve body 10, a second annular mounting seat 12 disposed within the first annular mounting seat 11, and an intake valve and an exhaust valve disposed between the piston 30 and the second annular mounting seat 12. The intake valve and exhaust valve are not shown in the figure, but their structures can be found in related technologies.

[0017] Please refer to Figure 2-4The valve body 10 has a cavity 13 at its top that slides relative to the piston 30, and a first annular mounting seat 11 and a second annular mounting seat 12 at its bottom for mounting intake and exhaust valves. The second annular mounting seat 12 has an exhaust port 14 for discharging compressed air. The bottom of the valve body 10 also has an intake port 15 and two exhaust ports 16. The intake port 15 connects to the interior of the first annular mounting seat 11, allowing compressed air from the air reservoir to enter through the intake port 15. The exhaust ports 16 connect to the cavity 13, allowing compressed air to enter the brake chamber through the exhaust ports 16. The cover 20 has a control port 21 connected to the cavity 13, through which the output air pressure from the brake valve enters the cavity 13 to drive the piston 30.

[0018] In existing technologies, only one sealing ring is typically used between the piston 30 and the valve body 10, resulting in poor sealing performance. To address this issue, the piston 30 of this invention features two limiting grooves arranged sequentially along the piston axial direction on its outer wall. Each of these limiting grooves contains a sealing ring 31 to provide a proper seal between the piston and the valve body. The two sealing rings 31 are of the same size, and the piston 30 is coaxial with the first and second annular mounting seats, improving concentricity and preventing misalignment.

[0019] Furthermore, the piston 30 is provided with a piston head 32 extending into the first annular mounting seat 11. The piston head 32 is provided with an inner cavity 33 communicating with the internal cavity of the first annular mounting seat 11. The bottom of the piston 30 is also provided with a protruding ridge 34, and a suction channel 35 is provided within the protruding ridge 34. One end of the suction channel 35 communicates with the inner cavity 33, and the other end extends to the outer wall of the piston 30 and is provided with an opening. The opening is located between two limiting grooves. The gas between the two sealing rings 31 can be discharged outward through the suction channel 35, which facilitates the solution of the problem of vacuuming the brake air circuit after adding sealing rings. If the vacuum cannot be discharged smoothly, the brake will be difficult to return to its original position, and there will be a problem of brake fatigue.

[0020] The above describes one or more embodiments of this utility model in a relatively specific and detailed manner, but it should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A brake relay valve with enhanced sealing performance, comprising a valve body, a piston disposed within the valve body, and a first annular mounting seat, characterized in that, The piston outer wall is provided with two limiting grooves in sequence along the piston axial direction. Each of the two limiting grooves is provided with a sealing ring of the same size. The piston is provided with a piston head extending into the first annular mounting seat. The piston head is provided with an inner cavity communicating with the inside of the first annular mounting seat. The piston is also provided with an air extraction channel. One end of the air extraction channel is connected to the inner cavity, and the other end extends to the piston outer wall and is provided with an opening. The opening is located between the two limiting grooves.

2. The brake relay valve with enhanced sealing performance according to claim 1, characterized in that, The first annular mounting seat contains a second annular mounting seat, which has an exhaust port. The first and second annular mounting seats are coaxial with the piston.

3. A brake relay valve with enhanced sealing performance according to claim 1, characterized in that, The piston has a protruding ridge on the side facing the first annular mounting seat, and the air extraction passage is located inside the protruding ridge.

4. A brake relay valve with enhanced sealing performance according to claim 1, characterized in that, The valve body is also provided with an air inlet communicating with the interior of the first annular mounting base, and two air outlets communicating with the external cavity of the first annular mounting base; the valve body can also be detachably connected to a cover, the cover being provided with a control port communicating with the interior of the valve body.

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