阅读说明：本技术 一种电控排气供气双重制动继动阀 (Electric control exhaust and air supply dual-braking relay valve ) 是由 康亚君 康大为 于 2021-08-11 设计创作，主要内容包括：一种电控排气供气双重制动继动阀,包括相互连通的电控排气制动装置和供气继动阀；电控排气制动装置包括相互连接的上盖和阀体,阀体一侧设置有电磁阀；上盖为中空结构,上盖的上部设置有第一排气孔,上盖的下方设置有活塞,第一排气孔和活塞之间设置有第二弹簧,第二弹簧位于上盖的内部；活塞的中部贯穿设置有活塞通孔,活塞的下方设置有第二腔室,第二腔室内设置有阀门,第二腔室的底部设置有密封螺栓,阀门的上端抵在活塞的下端,阀门和密封螺栓之间设置有第一弹簧；具有缩短制动时间、提高制动效率、保证制动效果的优点。(An electric control exhaust and air supply double-brake relay valve comprises an electric control exhaust brake device and an air supply relay valve which are communicated with each other; the electric control exhaust brake device comprises an upper cover and a valve body which are connected with each other, and one side of the valve body is provided with an electromagnetic valve; the upper cover is of a hollow structure, a first exhaust hole is formed in the upper portion of the upper cover, a piston is arranged below the upper cover, and a second spring is arranged between the first exhaust hole and the piston and located inside the upper cover; a piston through hole penetrates through the middle part of the piston, a second chamber is arranged below the piston, a valve is arranged in the second chamber, a sealing bolt is arranged at the bottom of the second chamber, the upper end of the valve abuts against the lower end of the piston, and a first spring is arranged between the valve and the sealing bolt; the braking device has the advantages of shortening braking time, improving braking efficiency and ensuring braking effect.)

1. The utility model provides an automatically controlled exhaust air feed dual braking relay valve which characterized in that: comprises an electric control exhaust brake device and an air supply relay valve which are communicated with each other;

the electric control exhaust brake device comprises an upper cover (1) and a valve body (2) which are connected with each other, and an electromagnetic valve (3) is arranged on one side of the valve body (2); the upper cover (1) is of a hollow structure, a first exhaust hole (11) is formed in the upper portion of the upper cover (1), a piston (4) is arranged below the upper cover (1), a second spring (8) is arranged between the first exhaust hole (11) and the piston (4), and the second spring (8) is located inside the upper cover (1); a piston through hole (16) penetrates through the middle of the piston (4), a second chamber (22) is arranged below the piston (4), a valve (5) is arranged in the second chamber (22), a sealing bolt (6) is arranged at the bottom of the second chamber (22), the upper end of the valve (5) abuts against the lower end of the piston (4), and a first spring (7) is arranged between the valve (5) and the sealing bolt (6);

a second exhaust hole (12) is formed above the electromagnetic valve (3), a first air inlet (13) is formed below the electromagnetic valve (3), and the second exhaust hole (12) and the first air inlet (13) are communicated with the electromagnetic valve (3);

a first chamber (21) and a third chamber (23) are sequentially arranged below the piston (4), one end of the first chamber (21) is communicated with the electromagnetic valve (3), the third chamber (23) is communicated with the second chamber (22), and the other end of the third chamber (23) is communicated with an air outlet (15); the second chamber (22) is communicated with a second air inlet (14), and the second chamber (22), the second air inlet (14) and the first air inlet (13) are communicated.

2. The electric exhaust-gas-feed dual brake relay valve according to claim 1, characterized in that: the air supply relay valve comprises an upper valve body (100) and a lower valve body (102) which are connected with each other, the upper valve body (100) and the lower valve body (102) are combined to form a cavity, and a linkage rod (101), a diaphragm (103), a fixing plate (121), a fastening screw (122), a first relay valve spring (104), a relay valve (105) and a retainer ring (107) are sequentially arranged in the cavity from top to bottom; the diaphragm (103) is arranged to be of an annular structure, the outer ring of the diaphragm (103) is extruded between the upper valve body (100) and the lower valve body (102), and the inner ring of the diaphragm (103) is extruded between the linkage rod (101) and the fixing plate (121); the upper end surface and the lower end surface of the first relay valve spring (104) are respectively abutted against the fixed plate (121) and the lower valve body (102); and a second relay valve spring (106) is arranged between the relay valve (105) and the retainer ring (107).

3. The electric exhaust-gas-feed dual brake relay valve according to claim 1, characterized in that: a second sealing ring (10) is arranged between the first cavity (21) and the third cavity (23).

4. The electric exhaust-gas-feed dual brake relay valve according to claim 1, characterized in that: the electromagnetic valve (3) comprises a movable iron core, and one end of the first cavity (21) is communicated with the edge of the movable iron core of the electromagnetic valve (3).

5. The electric exhaust-gas-feed dual brake relay valve according to claim 1, characterized in that: the second air inlet (14) is connected with an air storage cylinder, and the air outlet (15) is connected with an air-break brake air chamber.

6. The electric exhaust-gas-feed dual brake relay valve according to claim 1, characterized in that: a first sealing ring (9) is arranged between the piston (4) and the valve body (2).

7. The electric exhaust-gas-feed dual brake relay valve according to claim 2, characterized in that: the middle part of the lower valve body (102) is provided with a contact surface (126) which can realize a sealing effect by contacting with a relay valve (105), and the cavity is internally divided into a second control air chamber (154), a first control air chamber (151), a brake air chamber (152) and an air storage chamber (153) from top to bottom in sequence; the second control air chamber (154) is formed by surrounding an upper valve body (100) and a linkage rod (101), the first control air chamber (151) is formed by surrounding the upper valve body (100), the linkage rod (101) and a diaphragm (103), the brake air chamber (152) is formed by surrounding a lower valve body (102), the linkage rod (101) and the diaphragm (103), and the air storage chamber (153) is formed by surrounding the lower valve body (102).

The technical field is as follows:

the invention relates to the technical field of automobile braking, in particular to an electric control exhaust and air supply dual-braking relay valve.

Background art:

the existing automobile and trailer braking system generally adopts air supply braking, namely a control air control relay valve is used, and air in an air storage cylinder is sent to a braking chamber through the relay valve to implement braking. The air-break brake implements emergency braking by utilizing the stored energy of the chamber spring only when the air storage pipeline bursts suddenly or the air storage cylinder is empty, but can not implement service braking during normal running. The air supply and braking consumes more air and has longer braking time, and in order to solve the problems, the invention provides the electric control exhaust and air supply double-braking relay valve. The relay valve utilizes electric control, solves the problem of braking delay, utilizes exhaust and air supply dual braking to solve the problem of large air consumption, and has better braking effect because the exhaust is shorter than the air supply time.

The invention content is as follows:

in order to solve the problems and overcome the defects of the prior art, the invention provides the electric control exhaust and air supply dual-brake relay valve which shortens the braking time, improves the braking efficiency and ensures the braking effect.

In order to achieve the purpose, the invention provides an electric control exhaust and air supply dual-braking relay valve, which comprises an electric control exhaust braking device and an air supply relay valve which are communicated with each other;

the electric control exhaust brake device comprises an upper cover and a valve body which are connected with each other, and one side of the valve body is provided with an electromagnetic valve; the upper cover is of a hollow structure, a first exhaust hole is formed in the upper portion of the upper cover, a piston is arranged below the upper cover, and a second spring is arranged between the first exhaust hole and the piston and located inside the upper cover; a piston through hole penetrates through the middle part of the piston, a second chamber is arranged below the piston, a valve is arranged in the second chamber, a sealing bolt is arranged at the bottom of the second chamber, the upper end of the valve abuts against the lower end of the piston, and a first spring is arranged between the valve and the sealing bolt;

a second exhaust hole is formed above the electromagnetic valve, a first air inlet is formed below the electromagnetic valve, and the second exhaust hole and the first air inlet are communicated with the electromagnetic valve;

a first chamber and a third chamber are sequentially arranged below the piston, one end of the first chamber is communicated with the electromagnetic valve, the third chamber is communicated with the second chamber, and the other end of the third chamber is communicated with an air outlet; the second chamber is communicated with a second air inlet, and the second chamber, the second air inlet and the first air inlet are all communicated.

Further, the air supply relay valve comprises an upper valve body and a lower valve body which are connected with each other, the upper valve body and the lower valve body are combined to form a cavity, and a linkage rod, a diaphragm, a fixing plate, a fastening screw, a first relay valve spring, a relay valve and a check ring are sequentially arranged in the cavity from top to bottom; the diaphragm is arranged in an annular structure, the outer ring of the diaphragm is extruded between the upper valve body and the lower valve body, and the inner ring of the diaphragm is extruded between the linkage rod and the fixing plate; the upper end surface and the lower end surface of the first relay valve spring are respectively abutted against the fixed plate and the lower valve body; and a second relay valve spring is arranged between the relay valve and the retainer ring.

Further, a second sealing ring is arranged between the first chamber and the third chamber.

Furthermore, the solenoid valve includes the movable iron core, and one end of first cavity and the movable iron core edge intercommunication of solenoid valve.

Furthermore, the second air inlet is connected with an air storage cylinder, and the air outlet is connected with an air-cut-off brake air chamber.

Further, a first sealing ring is arranged between the piston and the valve body.

Furthermore, the middle part of the lower valve body is provided with a contact surface which can realize the sealing effect by contacting with a relay valve, and the interior of the cavity is sequentially divided into a second control air chamber, a first control air chamber, a brake air chamber and an air storage chamber from top to bottom; the second control air chamber is formed by enclosing an upper valve body and a linkage rod, the first control air chamber is formed by enclosing the upper valve body, the linkage rod and a diaphragm, the brake air chamber is formed by enclosing a lower valve body, the linkage rod and the diaphragm, and the air storage chamber is formed by enclosing the lower valve body.

The invention has the beneficial effects that:

the electric control exhaust and air supply dual-brake relay valve has the advantages of shortening the braking time, improving the braking efficiency and ensuring the braking effect, and the electric control is utilized to shorten the braking time so that the air supply brake and the exhaust brake work together, so that the vehicle can be braked by the air supply brake without too large air pressure, the braking time is shortened, the braking efficiency is improved, the braking effect is better, the vehicle safety is ensured, and the vehicle braking safety is improved.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an electrically controlled exhaust brake device according to the present invention;

in the drawings: 1. the valve comprises an upper cover, 2, a valve body, 3, an electromagnetic valve, 4, a piston, 5, a valve, 6, a sealing bolt, 7, a first spring, 8, a second spring, 9, a first sealing ring, 10, a second sealing ring, 11, a first exhaust hole, 12, a second exhaust hole, 13, a first air inlet, 14, a second air inlet, 15, an air outlet, 16, a piston through hole, 21, a first chamber, 22, a second chamber, 23 and a third chamber;

100. the brake valve comprises an upper valve body, 101, a linkage rod, 102, a lower valve body, 103, a diaphragm, 104, a first relay valve spring, 105, a relay valve, 106, a second relay valve spring, 107, a retainer ring, 121, a fixing plate, 122, a fastening screw, 123, a relay valve sealing ring, 124, a clamp spring, 125, a guide hole, 126, a contact surface, 130, an air cylinder air inlet, 131, a control air inlet, 132, a relay valve air outlet, 133, an exhaust channel, 134, a relay valve air outlet, 135, a first control air channel, 136, a second control air channel, 151, a first control air chamber, 152, a brake air chamber, 153, an air storage chamber, 154 and a second control air chamber.

The specific implementation mode is as follows:

in order to make the implementation objects, technical solutions and advantages of the present invention clearer, the present invention will be described in more detail below with reference to fig. 1 to 3 of the present invention.

The invention provides an electric control exhaust and air supply double-brake relay valve, which comprises an electric control exhaust brake device and an air supply relay valve which are communicated with each other; the electric control exhaust brake device comprises an upper cover 1 and a valve body 2 which are connected with each other, and an electromagnetic valve 3 is arranged on one side of the valve body 2; the upper cover 1 is of a hollow structure, a first exhaust hole 11 is formed in the upper portion of the upper cover 1, a piston 4 is arranged below the upper cover 1, a second spring 8 is arranged between the first exhaust hole 11 and the piston 4, and the second spring 8 is located inside the upper cover 1; a piston through hole 16 is arranged in the middle of the piston 4 in a penetrating manner, a second chamber 22 is arranged below the piston 4, a valve 5 is arranged in the second chamber 22, a sealing bolt 6 is arranged at the bottom of the second chamber 22, the upper end of the valve 5 abuts against the lower end of the piston 4, and a first spring 7 is arranged between the valve 5 and the sealing bolt 6; a second exhaust hole 12 is formed above the electromagnetic valve 3, a first air inlet 13 is formed below the electromagnetic valve 3, and the second exhaust hole 12 and the first air inlet 13 are communicated with the electromagnetic valve 3; a first chamber 21 and a third chamber 23 are sequentially arranged below the piston 4, one end of the first chamber 21 is communicated with the electromagnetic valve 3, the third chamber 23 is communicated with the second chamber 22, and the other end of the third chamber 23 is communicated with an air outlet 15; the second chamber 22 is communicated with the second air inlet 14, and the second chamber 22, the second air inlet 14 and the first air inlet 13 are all communicated; the air supply relay valve comprises an upper valve body 100 and a lower valve body 102 which are connected with each other, the upper valve body 100 and the lower valve body 102 are combined to form a cavity, and a linkage rod 101, a diaphragm 103, a fixing plate 121, a fastening screw 122, a first relay valve spring 104, a relay valve 105 and a retainer ring 107 are sequentially arranged in the cavity from top to bottom; the diaphragm 103 is arranged into an annular structure, the outer ring of the diaphragm 103 is extruded between the upper valve body 100 and the lower valve body 102, and the inner ring of the diaphragm 103 is extruded between the linkage rod 101 and the fixing plate 121; the upper and lower end faces of the first relay valve spring 104 respectively abut against the fixed plate 121 and the lower valve body 102; a second relay valve spring 106 is arranged between the relay valve 105 and the retainer ring 107; a second sealing ring 10 is arranged between the first chamber 21 and the third chamber 23; the electromagnetic valve 3 comprises a movable iron core, and one end of the first cavity 21 is communicated with the edge of the movable iron core of the electromagnetic valve 3; the second air inlet 14 is connected with an air storage cylinder, and the air outlet 15 is connected with an air-cut brake air chamber; a first sealing ring 9 is arranged between the piston 4 and the valve body 2; the middle part of the lower valve body 102 is provided with a contact surface 126 which can realize the sealing effect by contacting with the relay valve 105, and the cavity is internally divided into a second control air chamber 154, a first control air chamber 151, a brake air chamber 152 and an air storage chamber 153 from top to bottom in sequence; the second control air chamber 154 is enclosed by the upper valve body 100 and the linkage rod 101, the first control air chamber 151 is enclosed by the upper valve body 100, the linkage rod 101 and the diaphragm 103, the brake air chamber 152 is enclosed by the lower valve body 102, the linkage rod 101 and the diaphragm 103, and the air storage chamber 153 is enclosed by the lower valve body 102.

One of the embodiments of the invention is as follows:

the electric control exhaust brake device and the air supply relay valve are two systems and do not interfere with each other.

The electric control exhaust braking device comprises an upper cover 1 and a valve body 2 which are connected through threads, wherein a second spring 8 is arranged inside the upper cover 1, the lower end face of the second spring 8 abuts against the upper face of a piston 4, and a first cavity 21 is arranged at the bottom of the piston 4 and communicated with the lower end of a movable iron core of an electromagnetic valve 3. The lower end of the valve body 2 is provided with a second chamber, a valve 5, a first spring 7 and a sealing bolt 6 are arranged in the second chamber, the upper end of the valve 5 is in contact with the lower end of the piston 4, the upper end face and the lower end face of the first spring 7 are respectively abutted against the valve 5 and the sealing bolt 6, and the valve 5 is tightly attached to the lower end of the piston 4 by means of the elastic force of the first spring 7.

Wherein, the first exhaust hole 11 is communicated with the external atmosphere, the second exhaust hole 12 at the upper end of the electromagnetic valve 3 can be communicated with the control gas of the main vehicle or communicated with the atmosphere, and the first air inlet 13 at the lower end of the electromagnetic valve 3 is communicated with the air storage cylinder through the second air inlet 14. The first chamber 21 communicates with the moving-iron bottom of the solenoid valve 3. The third chamber 23 is communicated with the air-break brake air chamber through the air outlet 15, the second chamber 22 is communicated with the air storage cylinder through the second air inlet 14, and meanwhile, the second chamber 22 is communicated with the third chamber 23.

The solenoid valve 3 is connected in parallel with the brake lamp circuit.

An upper valve body 100 and a lower valve body 102 of the air supply brake relay valve are connected through bolts, a diaphragm 103 is clamped between the upper valve body 100 and the lower valve body 102, the diaphragm 103 is fixed on a linkage rod 101 through a fixing plate 121 and a fastening screw 122, the upper end of the linkage rod 101 moves in a guide hole 125 of the upper valve body 100 to prevent the linkage rod 101 from inclining, the linkage rod 101 and the upper valve body 100 form a second control air chamber 154, and a first relay valve spring 104 is positioned below the linkage rod 101; the relay valve 105, the second relay valve spring 106 and the retainer 107 are arranged in the lower valve body 102, an exhaust hole 134 is formed below the retainer 107, and the retainer 107 is retained in the air storage chamber 153 by the clamp spring 124. One side of the upper valve body 100 is provided with a control air inlet 131, one end of the control air inlet 131 is communicated with the first control air chamber 151, and the middle part of the control air inlet 131 is communicated with the second control air chamber 154 through a second control air channel 136; the lower valve body is provided with a relay valve air outlet 132 and an air reservoir air inlet 130 which penetrate through the lower valve body, one end of the relay valve air outlet 132 is communicated with the brake air chamber, the air reservoir air inlet 130 is communicated with the air reservoir 153, the middle part of the relay valve 105 is provided with an exhaust channel 133 which penetrates through the lower valve body, and the lower part of the retainer ring is provided with a relay valve air outlet 134 which is communicated with the outside and is communicated with the exhaust channel 133.

In other embodiments, a first control air passage 135 is further provided, and both ends of the first control air passage 135 are respectively communicated with the second exhaust hole 12 and the first control air chamber 151.

In other embodiments, the diaphragm 103 may be replaced with a piston.

The working state of the electric control exhaust and air supply double-brake relay valve can be divided into several states:

when the first and second exhaust holes 12 communicate with the first control air chamber 151 through the first control air passage 135:

1. under the normal condition of circuit, after the driver steps on the brake pedal, solenoid valve 3 begins to work, and 3 upper ends of solenoid valve are closed, and the lower extreme is opened, and the gas in the gas receiver passes through second air inlet 14 and first air inlet 13, and the bottom of solenoid valve 3 gets into first cavity 21, promotes piston 4 and shifts up, and valve 5 shifts up together under the effect of first spring 7 elasticity. When the valve 5 contacts the valve body, the air path between the second chamber 22 and the air outlet 15 is disconnected, and the connection with the air-break brake air chamber is disconnected. The piston 4 moves upwards continuously, leaves the valve 5, the air in the air-break brake air chamber passes through the third chamber 23 and then passes through the exhaust piston through hole 16, and the first exhaust hole 11 is exhausted to the atmosphere, so that the purpose of braking is achieved.

When a driver leaves the brake pedal by foot, the electromagnetic valve stops working, the upper end of the electromagnetic valve is opened, the lower end of the electromagnetic valve is closed, gas in the first chamber 21 is discharged along with control gas through the electromagnetic valve 3, the piston 4 moves downwards under the action of the elastic force of the second spring 8 to contact the valve 5, the gas path between the third chamber 23 and the piston through hole 16 is disconnected, the valve 5 is pressed by the second spring 8 to continuously move downwards, the valve 5 leaves the valve body, the third chamber 23 is communicated with the second chamber 22, and gas in the second chamber 22 enters the gas-cutoff brake chamber through the third chamber 23 to release braking.

2. In a circuit fault or no-electricity state, after a driver steps on a brake pedal, the electromagnetic valve 3 does not work, the upper end of the electromagnetic valve 3 is opened, the lower end of the electromagnetic valve 3 is closed, automobile control gas enters the bottom of the electromagnetic valve 3 through the first exhaust hole 11 and enters the first cavity 21 to push the piston 4 to move upwards, and the valve 5 moves upwards together under the action of the elastic force of the first spring 7. When the valve 5 contacts the valve body, the air path between the second chamber 22 and the air outlet 15 is disconnected, and the connection with the air-break brake air chamber is disconnected. The piston 4 moves upwards continuously, leaves the valve 5, and the air in the air-break brake air chamber enters the third chamber 23 through the air outlet 15, passes through the air path 16, and is exhausted to the atmosphere through the first exhaust hole 11, so that the purpose of braking is achieved.

During exhaust braking, the air supply brake relay valve also starts to work, control air enters the first control air chamber 151 and then enters the second control air chamber 154 through the second control air channel 136, the linkage rod 101 is driven to move downwards by the pushing diaphragm 103 under the action of air pressure, the linkage rod 101 pushes the relay valve 105 to move downwards, the relay valve 105 leaves the contact surface 126 and is communicated with the brake air chamber 152 and the air storage chamber 153, and air in the air storage cylinder enters the brake air chamber 152 from the air storage chamber 153 and enters the brake chamber through the relay valve air outlet 132 for braking.

Since electrical control is faster than control air control, exhaust braking is ahead of supply braking. And then braking is performed together.

When the driver leaves the brake pedal, the gas in the first chamber 21 is exhausted along with the control gas through the electromagnetic valve 3, the piston 4 moves downwards under the action of the elastic force of the second spring 8, contacts the valve 5, the gas path of the third chamber 23 and the piston through hole 16 is closed, the second spring 8 presses the valve to move downwards continuously, the valve leaves the valve body, the second chamber 22 is communicated with the third chamber 23, and the gas in the second chamber 22 enters the gas-break brake chamber through the third chamber 23 to release braking.

Meanwhile, control gas is exhausted from the first control gas chamber 151 and the second control gas chamber 154, the linkage rod 101 moves upwards under the action of the elastic force of the first relay valve spring 104, the relay valve 105 moves upwards under the action of the elastic force of the second relay valve spring 106, when the relay valve 105 is in contact with the contact surface 126, the passages of the brake gas chamber 152 and the air storage chamber 153 are cut off, the linkage rod 101 continues to move upwards to be separated from the relay valve 105, the brake gas chamber 152 is communicated with the exhaust passage 133, and the gas in the control chambers is exhausted to the atmosphere through the relay valve gas outlet 132, the brake gas chamber 152, the exhaust passage 133 and the relay valve exhaust port 134, so that braking is released.

Second, the case where the second exhaust hole 12 is directly communicated with the atmosphere:

1. under the normal condition of circuit, after the driver steps on the brake pedal, solenoid valve 3 begins to work, and 3 upper ends of solenoid valve are closed, and the lower extreme is opened, and the gas in the gas receiver passes through second air inlet 14 and first air inlet 13, and the bottom of solenoid valve 3 gets into first cavity 21, promotes piston 4 and shifts up, and valve 5 shifts up together under the effect of first spring 7 elasticity. When the valve 5 contacts the valve body, the air path between the second chamber 22 and the air outlet 15 is disconnected, and the connection with the air-break brake air chamber is disconnected. The piston 4 moves upwards continuously to leave the valve 5, and the air in the air-break brake air chamber passes through the third chamber 23, the exhaust piston through hole 16 and the first exhaust hole 11 and is exhausted to the atmosphere, so that the purpose of braking is achieved.

During exhaust braking, the air supply brake relay valve also starts to work, control air enters the first control air chamber 151 and then enters the second control air chamber 154 through the second control air channel 136, the linkage rod 101 is driven to move downwards by the pushing diaphragm 103 under the action of air pressure, the linkage rod 101 pushes the relay valve 105 to move downwards, the relay valve 105 leaves the contact surface 126 and is communicated with the brake air chamber 152 and the air storage chamber 153, and air in the air storage cylinder enters the brake air chamber 152 from the air storage chamber 153 and enters the brake chamber through the relay valve air outlet 132 for braking.

Since electrical control is faster than control air control, exhaust braking is ahead of supply braking. And then braking is performed together.

When a driver leaves the brake pedal by foot, the electromagnetic valve stops working, the upper end of the electromagnetic valve is opened, the lower end of the electromagnetic valve is closed, gas in the first chamber 21 is exhausted along with control gas through the electromagnetic valve 3, the piston 4 moves downwards under the action of the elastic force of the second spring 8 to contact the valve 5, the gas path between the third chamber 23 and the piston through hole 16 is disconnected, the valve 5 is pressed by the second spring 8 to continuously move downwards, the valve 5 leaves the valve body, the third chamber 23 is communicated with the second chamber 22, and the gas in the second chamber 22 enters the gas-cutoff brake chamber through the first chamber 21 to release braking.

Meanwhile, control gas is exhausted from the first control gas chamber 151 and the second control gas chamber 154, the linkage rod 101 moves upwards under the action of the elastic force of the first relay valve spring 104, the relay valve 105 moves upwards under the action of the elastic force of the second relay valve spring 106, when the relay valve 105 is in contact with the contact surface 126, the passages of the brake gas chamber 152 and the air storage chamber 153 are cut off, the linkage rod 101 continues to move upwards to be separated from the relay valve 105, the brake gas chamber 152 is communicated with the exhaust passage 133, and the gas in the control chambers is exhausted to the atmosphere through the relay valve gas outlet 132, the brake gas chamber 152, the exhaust passage 133 and the relay valve exhaust port 134, so that braking is released.

2. Under the condition of circuit failure or power loss, the exhaust device does not work, and only the air supply relay valve works; during exhaust braking, the air supply brake relay valve also starts to work, control air enters the first control air chamber 151 and then enters the second control air chamber 154 through the second control air channel 136, the linkage rod 101 is driven to move downwards by the pushing diaphragm 103 under the action of air pressure, the linkage rod 101 pushes the relay valve 105 to move downwards, the relay valve 105 leaves the contact surface 126 and is communicated with the brake air chamber 152 and the air storage chamber 153, and air in the air storage cylinder enters the brake air chamber 152 from the air storage chamber 153 and enters the brake chamber through the relay valve air outlet 132 for braking.

When the driver's foot leaves the brake pedal, control air is exhausted from the first control air chamber 151 and the second control air chamber 154, the linkage rod 101 moves upwards under the action of the elastic force of the first relay valve spring 104, the relay valve 105 moves upwards under the action of the elastic force of the second relay valve spring 106, when the relay valve 105 is in contact with the contact surface 126, the passages of the brake air chamber 152 and the air storage chamber 153 are disconnected, the linkage rod 101 moves upwards continuously, the linkage rod leaves the relay valve 105, the brake air chamber 152 is communicated with the exhaust passage 133, and air in the control chambers is exhausted to the atmosphere through the relay valve air outlet 132, the brake air chamber 152, the exhaust passage 133 and the relay valve exhaust port 134, so that braking is released.

The electric control exhaust and air supply double-brake relay valve can be used independently and also can be matched with ABS (anti-lock brake system) to ensure that the ABS can exert a better effect.

The relay valve has the dual braking functions of exhaust braking and air supply braking, the braking effect is better, the air consumption is smaller, and the use of air in the air storage cylinder can be reduced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.