JPH085885Y2 - Quick release valve - Google Patents

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention relates to a quick release valve.

b. Conventional technology In a vehicle, an air dryer is interposed in, for example, a rear brake system, and exhaust gas from a brake actuator is used,
There is one in which this exhaust gas is made to flow back to an air dryer to regenerate the desiccant (Japanese Patent Laid-Open No. 63-106337).

In such a vehicle, a switching valve that interlocks a quick release valve and a purge valve is incorporated in the air dryer, and when the brake is operated, compressed air from the brake valve is supplied to the brake actuator via the quick release valve to release the brake. The compressed air of the brake actuator is guided to the desiccant through the quick release valve, and is released into the atmosphere through the desiccant. The quick release valve used here is for guiding the exhaust air from the brake actuator to the desiccant of the air dryer without returning it to the brake valve.The switching valve supplies compressed air from the compressor to the air tank. During the period, the exhaust from the brake valve is released to the atmosphere without being guided to the desiccant.

c. Problems to be solved by the invention By the way, as described above, the air dryer is connected to the brake system of one of the brake valve and the brake actuator,
For example, if it is interposed in the rear brake line, a pressure difference occurs between the front brake and the rear brake due to the effect of the hysteresis of the quick release valve, especially when the brake is released, and as a result, the lining wear is out of balance and premature uniaxial wear occurs. There is fear.

Therefore, an object of the present invention is to provide a quick release valve having a small hysteresis.

d. Means for Solving the Problems In the quick release valve of the present invention, a disk is provided in a valve chamber communicating with an input port, an output port, and a passage as an exhaust port formed in a housing, and compressed air is supplied to the input port. Then, the pressure causes the disc to be displaced, thereby bringing the input port and the output port into communication with each other, and when the compressed air in the input port is removed, the disc in the output port is displaced. Thus, in the quick release valve that connects the output port and the passage as the exhaust port, an orifice is formed in the housing, and the orifice constantly connects the input port and the output port.

e. Function In the quick release valve of the present invention, especially when the compressed air in the output port is discharged to the exhaust port, it is also discharged from the input port through the orifice.

f. Embodiment FIG. 1 shows an air dryer incorporating a quick release valve according to the present invention, and FIG. 2 shows an air brake system incorporating this air dryer.

In this air brake system, an air dryer C is provided in a conduit between the compressor A and the air tank B, and the air dryer C is also provided in a conduit between the brake valve D and the rear brake actuator E.
Note that, in FIG. 2, reference numeral F indicates a front brake actuator, and this actuator F is connected to the brake valve D. Further, reference numeral G indicates a pressure regulator, and this pressure regulator G detects the pressure of the air tank B, and when the pressure reaches the upper limit set pressure,
When the compressor A is stopped and compressed air for piston operation is supplied to the air dryer C, and when the pressure in the air tank B drops to the lower limit set pressure, the compressor A is operated again and the compressed air supplied to the air dryer C is re-operated. Discharge to the outside.

As shown in FIG. 1, the air dryer C is composed of a cylindrical case 1 and a housing 2 attached to the lower part of the case 1. Exit 3 at the top of case 1
Is provided, and the outlet 3 is connected to the air tank B. On the other hand, an inlet 4 is provided on the side surface of the housing 2,
This inlet 4 is connected to the compressor A.

A desiccant 5 is contained in the case 1, and an oil filter 6 is arranged below the desiccant 5. The inner lower portion of the case 1 communicates with the inlet 4 through the hole 8 formed in the partition plate 7, and the compressed air supplied to the inlet 4 is transferred to the oil filter 6
And, it is configured to pass through the desiccant 5 toward the outlet 3. The desiccant 5 is sandwiched by a pair of upper and lower mesh holding plates 9 and 10, and an appropriate compression force is applied by a spring 11.

An input port 12 and an output port 13 are formed on the side surface of the housing 2 as shown in FIG.
The pressure regulator port 14 is activated as shown in FIG. The ports 12, 13, 14 are connected to the brake valve D, the rear brake actuator E, and the pressure regulator G by pipes. A quick release valve 15 is arranged between the input port 12 and the output port 13. This valve 15 has a passage as an input port 12, an output port and an exhaust port formed in the housing 2.
A rubber disc 16 is provided in the valve chamber 2a communicating with the valve chamber 20, and the peripheral edge portion 16a and the central portion 16b of the disc are constantly provided with the seat surfaces 17, 18
Is abutting lightly on. This valve 15 is a disk 16 when the pressure in port 12 becomes relatively low with respect to the pressure in port 13.
The peripheral edge portion 16a of the
6b separates from the seat surface 18. On the other hand, in the housing 2,
Orifice 19 that connects the input port 12 and the output port 13
Are formed. Further, one end of a passage 20 as an exhaust port is connected to the central portion of the seat surface 18, and the other end of the passage 20 is connected to the chamber 21. And this room 21
Communicate with the atmosphere via the switching valve 22. on the other hand,
When the pressure in the port 12 is relatively higher than the pressure in the port 13, the central portion 16b of the disk 16 is pressed against the seat surface 18 and the peripheral edge portion 16a is separated from the seat surface 17.

An exhaust port 23 is formed in the center of the housing 2. The exhaust port 23 communicates with the inlet 4 via the passage 24. A double rod type piston 25 is arranged in the center of the housing 2 so as to be vertically movable. At the lower end of the lower rod 25a of the piston 25, the purge valve body 26
Are integrally attached, and a purge valve 28 is constituted by the valve body 26 and a valve seat 27 formed at the opening edge of the exhaust port 23. A disc-shaped exhaust valve element 29 is integrally attached to the end of the upper rod 25b of the piston 25. On the other hand, below the valve element 29, a cylindrical partition member 30
And an exhaust hole 31 is formed in the upper wall of the partition member 30. The space defined by the partition member 30 is open to the atmosphere via an exhaust passage 32 formed in the axis of the piston 25. Then, the valve element 29 and the exhaust hole 31
The switching valve 22 is constituted by and. A spring 33 is provided between the piston 25 and the partition member 30, and the piston 25 is biased upward by the spring 33. The upper surface of the piston 25 communicates with the pressure regulator port 14 via a passage 34, as shown in FIG.

On the other hand, a pipe 35 is arranged in the center of the case 1, and the chamber 21 is connected to the desiccant storage chamber 38 through a purge passage 36 formed in the pipe 35 and a hole 37 formed in the outlet 3 of the air dryer C. Has been done. In the pipe 36, a check valve 39 is provided which is in the forward direction toward the outlet 3.

In the above air brake system, the compressed air discharged from the air compressor A is supplied to the inlet 4 of the air dryer C as shown in FIG.
After passing through the hole 8 of the partition plate 7 and being deoiled and dehumidified by the oil filter 6 and the desiccant 5, the air is supplied from the outlet 3 to the air tank B.

When the pressure of the air tank B rises to a predetermined upper limit set pressure due to the supply of this compressed air, the pressure regulator G detects this and the control pressure regulated by the pressure regulator G based on the detection result is the air compressor. When the air compressor A is stopped from being supplied to the control unit of A, the same control pressure is also supplied to the port 14 of the air dryer C to move the piston 25 downward, and then the purge valve 28 is opened first. The valve element 29 of the switching valve 22 is actuated, and the valve element 29 is exhausted.
Block 31. At this time, the air dryer C of this system
However, since the sub-tank for purging is not provided, the purging action is not performed at the same time when the purge valve 28 is opened. However, if the brake actuator E is moved back while the purge valve 28 is open, the purge action is performed by the dry exhaust air of the brake actuator E.

More specifically, when the pedal of the brake valve D shown in FIG. 2 is depressed, the compressed air in the air tank B is supplied to the input port 12 of the air dryer C, and this compressed air further bends the disk 16 of the quick release valve 15, Disc 16,
It is supplied to the brake actuator E via the output port 13. At that time, the compressed air that cannot be supplied through the disc 16 is also supplied from the orifice 19 to the brake actuator E.
Is supplied to.

Next, when the pedal of the brake valve D is released, the brake valve D exhausts air and the compressed air in the port 12 is exhausted to the atmosphere. In this way, when the pressure in the port 12 decreases, the exhaust air from the brake actuator E is introduced into the chamber 21 via the quick release valve 15 and the passage 20, and the exhaust air that cannot be exhausted from the passage 20 is exhausted from the orifice 19 Through the brake valve D to the atmosphere.

At this time, if the valve body 29 of the switching valve 22 blocks the exhaust hole 31, the exhaust air passes through the purge passage 36 in the pipe 35, pushes the check valve 39 open, and flows out to the outlet 3 side.
After passing through 37, desiccant 5 and oil filter 6,
Further, it is discharged to the outside from the purge valve 28 via the passage 24. At this time, the moisture and oil adhering to the desiccant 5 and the oil filter 6 are discharged to the outside together with the exhaust air, so that the desiccant 5 and the oil filter 6 can be regenerated.

On the other hand, when the exhaust hole 31 of the switching valve 22 is opened, the exhaust air is exhausted to the outside through the exhaust passage 32 in the piston 25. Also in this case, the exhaust air that cannot be exhausted from the passage 20 is also exhausted from the brake valve D via the orifice 19.

In the front brake system, when the pedal of the brake valve D is depressed, the compressed air in the air tank B is supplied to the brake actuator F.

Next, when the pedal of the brake valve D is released, the compressed air in the brake actuator F is released to the atmosphere via the brake valve D.

Therefore, in the above air brake system, since the hysteresis of the quick release valve 15 is extremely small, there is almost no pressure difference between the front brake system and the rear brake system.

In the above embodiment, the quick release valve 15 of the present invention is incorporated in the air dryer C, and the air dryer C is adopted in the air brake system. However, the quick release valve 15 of the present invention may be used as a single unit. It goes without saying that you can do it.

In addition, the quick release valve 15 shown in the above embodiment
The orifice 19 of the port 19 has a degree that does not significantly affect the operation of the disk 16 operated by the pressure difference between the input port 12 and the output port 13, for example, one of the cross-sectional areas of the ports 12 and 13.
It is preferable that the cross-sectional area is about 0 to 20%.

g. Effect of the Invention As described above, in the quick release valve according to the present invention, the compressed air is discharged even through the orifice, so that the hysteresis becomes small.

[Brief description of drawings]

1 (a) and 1 (b) are longitudinal sectional views of an air dryer having a quick release valve according to the present invention, and FIG. 2 is a pipeline diagram showing an air brake system incorporating the air dryer. A ... Compressor, B ... Air tank, C ... Air dryer, D ... Brake valve, E, F ... Brake actuator, G ... Pressure regulator, 1 ... Case, 2 ...
Housing, 2a ... Valve chamber, 3 ... Outlet, 4 ... Inlet, 5
…… Desiccant, 6 …… Oil filter, 12 …… Input port, 13 …… Output port, 14 …… Pressure regulator port, 15…
… Quick release valve, 16… Disc, 17,18…
… Seat surface, 19 …… Orifice, 20 …… Exhaust port passage, 21 …… Room, 22 …… Switching valve, 23 …… Exhaust port, 24 …… Passage, 25 …… Piston, 28 …… Purge valve, 32 ... exhaust passage, 34 ... passage, 36 ... purge passage,
37 ... Hole, 38 ... Desiccant storage chamber, 39 ... Check valve.

Claims (1)

[Scope of utility model registration request] 1. A valve chamber communicating with an input port 12 and an output port 13 formed in a housing 2 and a passage 20 as an exhaust port.
When a disk 16 is provided in 2a and compressed air is supplied to the input port 12, the pressure causes displacement of the disk 16, thereby causing the input port 12 and the output port 13 to be displaced.
When the compressed air in the input port 12 is removed, the disk 16 is displaced by the pressure in the output port 13, thereby connecting the output port 13 and the passage 20 as the exhaust port. A quick release valve 15 is characterized in that an orifice 19 is formed in the housing 2 and the input port 12 and the output port 13 are always communicated with each other by the orifice 19.