Four-loop protective valve

Abstract

The utility model relates to the field of vehicle braking, and discloses a four-loop protection valve which comprises a middle main valve body, the upper portion of the main valve body is connected and provided with a first protection valve, the lower portion of the main valve body is connected and provided with a second protection valve, and the main valve body is provided with an air inlet, a first air outlet, a second air outlet, a third air outlet and a fourth air outlet; a cavity is formed in the main valve body and communicated with the air inlet, a first channel and a second channel are arranged in the cavity, the air outlet end of the first protection valve is communicated with the first air outlet and the second air outlet, and the air outlet end of the second protection valve is communicated with the third air outlet and the fourth air outlet. The air outlet end of the first protection valve is communicated with the first channel through one-way valve control, the first channel and the second channel are connected and controlled through the pressure limiting valve, the second channel is connected with the air inlet end of the second protection valve, and the air outlet end of the second protection valve is communicated with the third air outlet and the fourth air outlet. The device can be used independently, and has the advantages of few parts, convenience in assembly and the like.

Description

Technical Field

[0001] The invention relates to the field of vehicle braking, and in particular to a four-circuit protection valve and an electronic mechanical braking system. Background Art

[0002] Chinese patent CN03255166.5 discloses a four-circuit protection valve. If the four-circuit protection valve wants to have a pressure limiting function at the air outlet, it can only be connected to a pressure limiting valve at the four-circuit air outlet to achieve the pressure limiting function, or an external pressure limiting valve is fixed to the four-circuit valve body with bolts. This structure has the disadvantages of inconvenient installation and poor air tightness. 2. At present, the four-circuit protection valve with integrated pressure limiting function cannot be used alone, and can only be integrated on the dryer to form an air handling unit as a whole. Summary of the invention

[0003] The present invention aims at the shortcomings of the prior art and provides a four-circuit protection valve and an electronic mechanical brake system.

[0004] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0005] A four-circuit protection valve comprises a main valve body in the middle, a first protection valve is connected and installed on the upper part of the main valve body, a second protection valve is connected and installed on the lower part of the main valve body, an air inlet and air outlets one, two, three and four are provided on the main valve body; a cavity is formed in the main valve body, the cavity is connected with the air inlet, a channel one and a channel two are arranged in the cavity, the air outlet end of the first protection valve is connected with the air outlet one and the air outlet two, the air outlet end of the second protection valve is connected with the air outlet three and the air outlet four; the air outlet end of the first protection valve is connected with the channel one through the control of a one-way valve, the channel one and the channel two are connected and controlled through a pressure limiting valve, the second channel is connected with the air inlet end of the second protection valve, and the air outlet end of the second protection valve is connected with the air outlet three and the air outlet four.

[0006] Preferably, the first protective valve includes a first valve body and a pair of first protective valve core assemblies arranged in the first valve body, wherein the outlet end of one first protective valve core assembly is connected to outlet port one, and the outlet end of the other first protective valve core assembly is connected to outlet port two.

[0007] Preferably, the upper end of the main valve body includes a first installation cavity, and the first protection valve core assembly is installed in the first installation cavity. The first protection valve core assembly divides the first installation cavity into an air inlet A cavity and an air outlet B cavity. The air inlet A cavity is connected to the air inlet, and the compressed air at the air inlet can overcome the force of the first protection valve core assembly through the air inlet A cavity and reach the air outlet B cavity.

[0008] Preferably, the second pressure limiting valve includes a second valve body and a pair of second protection valve core assemblies arranged in the second valve body, wherein the outlet end of one second protection valve core assembly is connected to the outlet port three, and the outlet end of the other second valve core assembly is connected to the outlet port four.

[0009] Preferably, the pressure limiting valve is located on the connecting path between channel one and channel two, and the pressure limiting valve includes a pressure limiting valve seat, a pressure limiting valve core, a piston and a pressure regulating spring; the pressure limiting valve core abuts against the piston under the action of the pressure regulating spring, an air intake gap is formed between the piston and the pressure limiting valve seat, and the air intake gap is connected to channel one; the pressure limiting valve seat is provided with a valve port below the piston, and the valve port is used to control the connection or disconnection between the air intake gap and channel two; when the intake air pressure is greater than the pressure of the pressure regulating spring, the piston moves downward and abuts against the valve port, and the air intake gap is disconnected from channel two.

[0010] Preferably, a one-way valve is further included, which is arranged at the connection between chamber B and channel one, and the compressed air in chamber B enters channel one through the one-way valve.

[0011] Preferably, an internal thread is provided at the air inlet, and fixing seats are provided and extended on both sides of the air inlet, and fixing holes are provided on the fixing seats.

[0012] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0013] The integrated pressure limiting valve is used to realize the integrity of the four-circuit protection valve. At the same time, the air inlet and the internal air path are designed so that it can be used independently without the drying tank. Compared with the traditional four-circuit protection valve, this device has the advantages of good integrity, simple assembly and wide application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the overall structure diagram of the device.

[0015] Figure 2 This is the overall structure diagram of the device.

[0016] Figure 3 It is a schematic diagram of the internal structure of the device.

[0017] The technical names of the accompanying drawings are: 1-main valve body, 2-first protective valve, 3-second protective valve, 21-air outlet one, 22-air outlet two, 23-air outlet three, 24-air outlet four, 4-check valve, 5-channel one, 6-channel two, 7-plug, 8-air inlet A chamber, 9-B chamber, 10-pressure limiting valve seat, 11-pressure limiting valve core, 12-piston, 13-pressure regulating spring, 14-air inlet gap, 15-valve port, 16-F chamber, 17-G channel, 18-H channel, 19-fixed seat, 20-fixed hole. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] Example 1

[0020] A four-circuit protection valve comprises a main valve body 1 in the middle, a first protection valve 2 is connected and installed on the upper part of the main valve body 1, a second protection valve 3 is connected and installed on the lower part of the main valve body 1, an air inlet 29 and air outlets 1 21, 22, 3 23 and 4 24 are provided on the main valve body 1; a cavity is formed in the main valve body 1, the cavity is connected with the air inlet 29, a channel 1 5 and a channel 2 6 are arranged in the cavity, the air outlet end of the first protection valve 2 is connected with the air outlet 1 21 and the air outlet 22, the air outlet end of the second protection valve 3 is connected with the air outlet 3 23 and the air outlet 4 24; the air outlet end of the first protection valve 2 is controlled to be connected with the channel 1 5 by a one-way valve 4, the channel 1 5 and the channel 2 6 are connected and controlled by a pressure limiting valve 28, the second channel is connected with the air inlet end of the second protection valve 3, and the air outlet end of the second protection valve 3 is connected with the air outlet 3 23 and the air outlet 4 24. In this embodiment, a part of the valve body of the first protection valve 2, the second protection valve 3 and the pressure limiting valve 28 is integrated on the main valve body 1, and the other part is combined with the cover body to form a complete chamber to assemble the piston 12, valve and spring in the chamber. Channel 1 5 and channel 2 6 are arranged in parallel, and one end of channel 1 5 and channel 2 6 extends from the inside of the main valve body 1 to the outside, and the outer ends of channel 1 5 and channel 2 6 are sealed by plugs 7.

[0021] The first protection valve 2 includes a first valve body and a pair of first protection valve core components 26 disposed in the first valve body, wherein the outlet end of one first protection valve core component 26 is connected to the outlet port 1 21, and the outlet end of the other first protection valve core component 26 is connected to the outlet port 2 22. The first protection valve 2 component includes a spring and a switch diaphragm, and the housing is fixedly connected to the first valve body.

[0022] The upper end of the main valve body 1 includes a first installation cavity, and the first protection valve core assembly 26 is installed in the first installation cavity. The first valve body and the first installation cavity form a complete protection valve cavity. The first protection valve core assembly 26 divides the first installation cavity into an air inlet A cavity 8 and an air outlet B cavity 9. The air inlet A cavity 8 is connected to the air inlet 29. The compressed air of the air inlet 29 can reach the air outlet B cavity 9 through the air inlet A cavity 8 to overcome the force of the first protection valve core assembly 26. The diaphragm contacts the air inlet end of the B cavity 9 under the action of the spring. When the compressed air in the A cavity is large, it can open the diaphragm and enter the B cavity 9.

[0023] The second protection valve 3 includes a second valve body and a pair of second protection valve core components 27 disposed in the second valve body. The structure of the second protection valve 3 is similar to that of the first protection valve 2. The outlet end of one second protection valve core component 27 is connected to the outlet port 3 23, and the outlet end of the other second valve core component is connected to the outlet port 4 24.

[0024] The pressure-limiting valve 28 is located on the connection path between channel one 5 and channel two 6, and the pressure-limiting valve 28 includes a pressure-limiting valve seat 10, a pressure-limiting valve core 11, a piston 12 and a pressure-regulating spring 13; the pressure-limiting valve core 11 abuts against the piston 12 under the action of the pressure-regulating spring 13, and an air intake gap 14 is formed between the piston 12 and the pressure-limiting valve seat 10, and the air intake gap 14 is connected to channel one 5; the pressure-limiting valve seat 10 is provided with a valve port 15 below the piston 12, and the valve port 15 is used to control the connection or disconnection of the air intake gap 14 and channel two 6; when the intake air pressure is greater than the pressure of the pressure-regulating spring 13, the piston 12 moves downward and abuts against the valve port 15, and the air intake gap 14 and channel two 6 are disconnected.

[0025] The pressure limiting valve 28 includes a lower valve body and an upper valve cavity, the upper valve cavity extends into channel 1 5 and channel 2 6, and the pressure limiting valve seat 10, pressure limiting valve core 11, piston 12 and pressure regulating spring 13 are installed in the cavity surrounded by the lower valve body and the upper valve cavity.

[0026] Among them, the valve cavity at the outlet end of the second protection valve 3 core is the F cavity 16, and also includes a G channel 17 and an H channel 18. One end of the H channel 18 is connected to the air outlet 1 21, and the other end is connected to the G channel 17. The F cavity 16 is connected to the air outlet 3 23. A one-way valve 4 is arranged between the F cavity 16 and the G channel 17, which leads to the passage in the direction of the G channel 17. The air outlet 3 23 is used to connect to the external parking assist manual valve.

[0027] The one-way valve 4 is also provided at the connection between the B chamber 9 and the channel 1 5, and the compressed air of the B chamber 9 enters the channel 1 5 through the one-way valve 4. An internal thread is provided at the air inlet 29, and a fixing seat 19 is provided on both sides of the air inlet 29, and a fixing hole 20 is provided on the fixing seat 19.

[0028] The working process of the protection valve is as follows:

[0029] First, compressed air enters the air inlet 29, and then enters the air inlet A chamber 8. The compressed air in the air inlet A chamber 8 opens the switch diaphragm and enters the air outlet B chamber 9. The air outlet B chamber 9 is connected with the air outlet 1 21 and the air outlet 2 22. While the air is discharged from the air outlet 1 21 and the air outlet 2 22, another part of the compressed air opens the check valve 4 and enters the channel 1 5. The compressed air in the channel 1 5 passes through the air outlet gap of the pressure limiting valve 28 and enters the channel 2 6. The channel 2 6 enters the F chamber 16 through the second protection valve 3 assembly. The F chamber 16 is connected with the air outlet 3 23 and the air outlet 4 24.

[0030] When the pressure of the air outlet three 23 and the air outlet four 24 reaches a certain value, the compressed air acting on the pressure limiting piston 12 will overcome the force of the pressure regulating spring 13 to close the valve port 15, thereby cutting off the connection between the channel two 6 and the channel one 5.

[0031] When the air at the air outlet 1 21 is cut off, the air pressure at the air outlet drops to 0, and the air pressure at the channel H also drops. At this time, the air pressure at the port 23 passes through the G channel 17, pushes the check valve 4, and then flows to the H channel 18 to reach the B chamber 9. As the channel of the air outlet 1 21 leaks, the air pressure at the air outlet 3 23 also drops at the same time. The air outlet 3 23 is connected to the parking auxiliary manual control valve, so that the air pressure is released and the spring brake air chamber is under the action of the energy storage spring to achieve automatic parking, which plays a driving protection function.

[0032] Example 2

[0033] The difference from Example 1 is that the number of the four-circuit protection valve fixing holes 20 is 4.

[0034] Example 3

[0035] A vehicle, comprising the four-circuit protection valve in Example 1.

Claims

1. A four-circuit protection valve, characterized in that: The invention comprises a main valve body (1) in the middle, a first protective valve (2) is connected to and installed on the upper part of the main valve body (1), a second protective valve (3) is connected to and installed on the lower part of the main valve body (1), and an air inlet (29) and an air outlet 1 (21), an air outlet 2 (22), an air outlet 3 (23), and an air outlet 4 (24) are provided on the main valve body (1); a cavity is formed in the main valve body (1), the cavity is connected to the air inlet (29), a channel 1 (5) and a channel 2 (6) are provided in the cavity, and an air outlet of the first protective valve (2) is connected to the air outlet of the first protective valve (2). The first protective valve (2) is connected to the air outlet 1 (21) and the air outlet 2 (22), and the air outlet end of the second protective valve (3) is connected to the air outlet 3 (23) and the air outlet 4 (24); the air outlet end of the first protective valve (2) is connected to the channel 1 (5) through the control of the one-way valve (4), the channel 1 (5) and the channel 2 (6) are connected and controlled through the pressure limiting valve (28), the second channel is connected to the air inlet end of the second protective valve (3), and the air outlet end of the second protective valve (3) is connected to the air outlet 3 (23) and the air outlet 4 (24).

2. A four-circuit protection valve according to claim 1, characterized in that: Channel 1 (5) and channel 2 (6) are arranged in parallel, one end of channel 1 (5) and channel 2 (6) extends from the inside of the main valve body (1) to the outside, and the outer ends of channel 1 (5) and channel 2 (6) are sealed by plugs (7).

3. A four-circuit protection valve according to claim 1, characterized in that: The first protection valve (2) comprises a first valve body and a pair of first protection valve core components (26) arranged in the first valve body, wherein the outlet end of one of the first protection valve core components (26) is connected to the outlet port 1 (21), and the outlet end of the other first protection valve core component (26) is connected to the outlet port 2 (22); the upper end of the main valve body (1) comprises a first installation cavity, the first protection valve core component (26) is installed in the first installation cavity, the first protection valve core component (26) divides the first installation cavity into an air inlet A cavity (8) and an air outlet B cavity (9), the air inlet A cavity (8) and the air inlet (29) are connected, and the compressed air of the air inlet (29) can overcome the action force of the first protection valve core component (26) through the air inlet A cavity (8) to reach the air outlet B cavity (9); The second protection valve (3) comprises a second valve body and a pair of second protection valve core components (27) arranged in the second valve body, wherein the gas outlet end of one of the second protection valve core components (27) is connected to the gas outlet port 3 (23). The air outlet end of another second valve core component is connected to the air outlet four (24).

4. A four-circuit protection valve according to claim 3, characterized in that: The pressure-limiting valve (28) is located on the connection path between the first channel (5) and the second channel (6), and the pressure-limiting valve (28) comprises a pressure-limiting valve seat (10), a pressure-limiting valve core (11), a piston (12) and a pressure-regulating spring (13); the pressure-limiting valve (28) comprises a lower valve body and an upper valve cavity, and the upper valve cavity extends into the first channel (5) and the second channel (6), and the pressure-limiting valve seat (10), the pressure-limiting valve core (11), the piston (12) and the pressure-regulating spring (13) are installed in a cavity surrounded by the lower valve body and the upper valve cavity.

5. A four-circuit protection valve according to claim 4, characterized in that: The valve core (11) of the pressure-limiting valve abuts against the piston (12) under the action of the pressure-regulating spring (13); an air intake gap (14) is formed between the piston (12) and the pressure-limiting valve seat (10); the air intake gap (14) is connected to the first channel (5); the pressure-limiting valve seat (10) is provided with a valve port (15) below the piston (12); the valve port (15) is used to control the connection or disconnection between the air intake gap (14) and the second channel (6); when the air intake pressure is greater than the pressure of the pressure-regulating spring (13), the piston (12) moves downward and abuts against the valve port (15); the air intake gap (14) and the second channel (6) are disconnected.

6. A four-circuit protection valve according to claim 4, characterized in that: It also includes a one-way valve (4), which is arranged at the connection between chamber B (9) and channel one (5), and compressed air in chamber B (9) enters channel one (5) through the one-way valve (4).

7. A four-circuit protection valve according to claim 3, characterized in that: The valve cavity at the outlet end of the second protection valve (3) core is an F cavity (16), which also includes a G channel (17) and an H channel (18). One end of the H channel (18) is connected to an outlet port 1 (21), and the other end is connected to the G channel (17). The F cavity (16) is connected to an outlet port 3 (23). A one-way valve (4) is provided between the F cavity (16) and the G channel (17) to open a passage in the direction of the G channel (17). The outlet port 3 (23) is used to connect to an external parking assist manual valve.

8. A four-circuit protection valve according to claim 1, characterized in that: An internal thread is provided at the air inlet (29), and fixing seats (19) are provided extending from both sides of the air inlet (29), and fixing holes (20) are provided on the fixing seats (19).

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