JP2002013407A - Silencer for pneumatic system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a silencer for a pneumatic system not to enlarge a setting space of a pneumatic instrument in the pneumatic system and not to obstruct working of each of the pneumatic instruments. SOLUTION: Valve systems 30A, 30B furnished with an inlet communicated to an exhaust port of a brake valve 5, and inlet 26A communicated to an exhaust port of an air dryer 2 and an inlet 27A communicated to each of exhaust ports of a relay valve and a pressure control valve and to prevent inflow of exhaust air to the other inlet when compressed air exhausted from the pneumatic system to either one of the inlets are provided. Consequently, it is possible to commonize the silencer 20 without obstructing proper working of each of the pneumatic instruments.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer for a pneumatic system for reducing exhaust noise of a pneumatic device.

[0002]

2. Description of the Related Art An example of this kind of prior art is disclosed in Japanese Utility Model Publication No. Hei 6-27789. The above publication discloses a silencer that is connected to an exhaust port of a pneumatic device and reduces noise of exhaust of compressed air from the pneumatic device.

Since such a silencer is provided for each pneumatic device, the size of each pneumatic device is increased, and the installation space is limited.
Therefore, it is conceivable to provide a common silencer for a plurality of pneumatic devices.

[0004]

However, since the exhaust timing of each pneumatic device is different, the exhaust gas discharged from a certain pneumatic device flows back from the silencer side to another pneumatic device, and the other pneumatic devices are discharged. There is a risk of obstructing the exhaust of the equipment. For example, when applied to an air brake system, compressed air discharged from a brake valve is supplied to a brake actuator via a valve such as a relay valve and a pressure control valve as an anti-skid control valve (ABS control valve). When releasing the brake, first, exhaust is performed from the upstream brake valve. If this exhaust gas flows backward to the relay valve side, the exhaust from the relay valve is disturbed, and a problem occurs in that the release of the brake is delayed.

An air dryer (compressed air drying device)
In a pneumatic system that includes air, the exhaust air discharged from the air dryer contains so-called drains (foreign matter such as moisture and oil). There is a problem of giving.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a pneumatic system silencer that does not increase the installation space for pneumatic equipment in a pneumatic system and does not hinder the operation of each pneumatic equipment. Make it an issue.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pneumatic system silencer which is used in a pneumatic system provided with a plurality of pneumatic devices and is connected to an exhaust port of the pneumatic device. A plurality of inlets to which the exhaust ports of the pneumatic device are connected are formed, and when exhaust is performed from the pneumatic device to any one of the plurality of inlets, the exhaust flows back to another inlet. The problem is solved by a silencer for a pneumatic system, which is provided with a valve device for preventing such a situation.

[0008] With this configuration, even if the exhaust timings of the plurality of pneumatic components are different, the valve device prevents exhaust from one pneumatic component from flowing back from the silencer side to another pneumatic component. , Does not hinder the operation of the other pneumatic components. Therefore, a common silencer can be achieved without increasing the installation space of each pneumatic device and without obstructing the operation of each pneumatic device.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment,
A vehicle air brake system will be described as an example of the pneumatic system.

FIG. 1 is a piping diagram of an air brake system according to an embodiment of the present invention. This system stores air compressed by an air compressor (air compression device) 1 in air tanks 3 and 4, and adjusts air pressure adjusted according to a driver's operation amount of a brake valve 5 by a relay valve 6.
11 and pressure control valves (ABS control valves) 7, 8, 12,
13, brake operating devices 9, 10, 1 for each wheel
This is a conventionally known system for supplying the power to the fourth and the fourth.
Here, reference numeral 17 is a parking brake valve,
Reference numeral 18 denotes a pressure gauge, and 19 denotes a horn.

The compressed air from the air compressor 1 is dried by an air dryer (compressed air drying device) 2 and at the same time foreign substances such as oil contained therein are removed. The pressure in the air tank 3 is monitored by a pressure regulator (pressure governor) 16. As is well known, when the pressure exceeds a predetermined pressure, an unload command (air pressure signal) is transmitted to the air compressor 1. ,
A purge command (pneumatic signal) is transmitted to the air dryer 2. As a result, the air supply from the air compressor 1 to the air tanks 3 and 4 is stopped, and the air dryer 2 performs a so-called purging action or self-cleaning action in which the compressed air that has been subjected to the drying process is back-flowed to exhaust moisture and foreign substances. The exhaust air from the air dryer 2 is supplied to the silencer 20 via an exhaust pipe 21A.

On the other hand, when the brake operation is completed, the brake valve 5, the relay valves 6, 11 exhaust the compressed air and release the braking action. The pressure control valves 7, 8, 12, and 13 disposed for each wheel are provided with a brake actuating device 9 for releasing a brake pressure when receiving a brake release command from a control unit (not shown) for determining the rotation state of the wheel. , 10, 14, and 15 are exhausted. Exhaust gas from the brake valve 5 is supplied to the silencer 20 via an exhaust pipe 21B, and relay valves 6, 11 and pressure control valves 7, 8, 12, 13 are provided.
From the pipes C1, C2, C3, C
4, after passing through C5 and C6, a common exhaust pipe 21
It is supplied to the silencer 20 via C.

Next, details of the silencer 20 according to the present invention will be described.

FIG. 2 shows the structure of the silencer 20. The silencer 20 includes a pipe connecting portion main body 22 to which exhaust pipes 21A to 21C are connected, and a silencer main body 24 in which a silencing member 23 such as crashed aluminum is stored.

An inlet 25A is formed at the center of the upper part of the pipe connecting portion main body 22, to which an exhaust pipe 21B communicating with an exhaust port of the brake valve 5 is connected. An inlet forming member 26 having an inlet 26A connected to an exhaust pipe 21A connected to an exhaust port of the air dryer 2 at both ends of a stepped hole 28 which communicates with the inlet 25A and penetrates the pipe connecting portion main body 22. And the relay valves 6, 11 and the pressure control valves 7,
An inlet forming member 27 having an inlet 27A to which an exhaust pipe 21C communicating with each of the exhaust ports 8, 12, 13 is connected;
Each is screwed and fixed. These entrances 25A, 26
A and 27A are supplied to the stepped hole 28 and
A passage 29 orthogonal to the large diameter hole 28a of the stepped hole 28,
It is introduced into the silencer main body 24 via 29.

In this embodiment, the inlets 25A, 2A
When the compressed air is exhausted to one of the inlets 6A and 27A, the valve devices 30A and 30B for preventing the exhaust from being introduced to the other inlet and flowing back to the air brake system are provided. , Are provided in the large-diameter holes 28a of the stepped hole 28, respectively.

The valve devices 30A and 30B have the same configuration, and are provided with respect to the inner wall surfaces of the cylindrical sleeves 31 and 31 assembled to the large diameter holes 28a and 28a of the stepped holes 28.
Rubber valve bodies 33, 33 having synthetic resin annular members 32, 32 are slidably disposed. Valve body 33,3
Reference numeral 3 denotes a position (shown) in contact with the bottom surfaces 26b and 27b of the inlet forming members 26 and 27, and step portions 28b and 2 of the stepped hole 28.
8b. Sleeve 31
At four places on the side peripheral surface, a long hole 31a communicating between the stepped hole 28 and the passage 29 is formed, and the entrances 25A, 26A, 2
The exhaust gas introduced into 7A reaches the passage 29 via these long holes 31a.

The silencer main body 24 has a projection 35 with respect to a screw hole 34 formed in the center of the lower surface of the pipe connection main body 22.
Is screwed and fixed, so that it is detachably connected to the pipe connection portion main body 22. The silencer main body 24 has an internal space 37 communicating with the passages 29, 29 through the through holes 36, 36, and the silencer 23 is housed in the internal space 37. The silencer 23 has a perforated plate 3 having a large number of holes 38a and 39a for exhaust passage on its upper and lower surfaces.
8, 39, a step portion 24b above the internal space 37,
C that engages with an annular groove 41 formed at the open end of the outlet 40
It is held between the mold ring (retaining member) 42.

The exhaust gas introduced into the silencer main body 24 is attenuated by the silencer 23 and is discharged to the outside through the outlet 40. However, the exhaust noise is reduced due to excessive accumulation or freezing of foreign matter (moisture, oil, etc.). When the flow resistance in the portion 23 increases to a predetermined value or more, the air is discharged through a bypass 43 formed at a predetermined portion between the sound deadening portion 23 and the sound deadening portion main body 24.

In this embodiment configured as described above, when the driver releases the brake operation, the brake valve 5 is released.
The compressed air exhausted from the exhaust port is introduced into the inlet 25A of the silencer 20 via the exhaust pipe 21A, and the pressure of the compressed air causes the valve bodies 33, 33 of the valve devices 30A, 30B to be respectively formed as shown in the drawing. , 27 at the bottom 2
6b, 27b, and is discharged from the outlet 40 after being subjected to the silencing action by the silencing member 23 without flowing into the other inlets 26A, 27A.

On the other hand, the exhaust from the relay valves 6 and 11 is performed after the signal pressure (air pressure) from the brake valve 5 to the relay valves 6 and 11 is lost. Later. Therefore, when the compressed air exhausted from the relay valves 6 and 11 is introduced into the silencer 20 via the exhaust pipe 21C and the inlet 27A, the exhaust operation from the brake valve 5 has been completed, and therefore, via the valve device 30B. Exhaust is possible. Also at this time, the valve device 30B prevents the exhaust gas from flowing into the inlets 25A and 26A.

Since the exhaust operation from the pressure control valves 7, 8, 12, 13 is performed during the brake operation, the valve device 3
At 0B, it is discharged without competing with the exhaust action of the brake valve 5.

Next, from the air dryer 2 to the exhaust pipe 21A
The exhaust gas introduced into the silencer 20 through the inlet 26A moves the valve body 33 of the valve device 30A from the right position illustrated to the left position seated on the step portion 28b of the stepped hole 28, and the like. Is discharged from the outlet 40 without flowing into the inlets 25A and 27A.

Since the exhaust operation of the air dryer 2 is performed irrespective of the presence or absence of the driver's braking operation, the exhaust may be simultaneously performed from the brake valve 5 when the exhaust is performed. In this case, the exhaust gas introduced into the inlet 25A on the brake valve 5 side and the exhaust gas introduced into the inlet 26A on the air dryer 2 side correspond to the valve device 30.
Although it will compete in A, any one having a higher pressure is selected and communicated with the outlet 40. At this time, the exhaust of the brake valve 5 may be lower in pressure than the exhaust of the air dryer 2. In this case, the exhaust of the brake valve 5 can be exhausted from the valve device 30B side. The proper operation of is not hindered.

As described above, according to the silencer 20 of the present embodiment, the plurality of inlets 25A, 25B, 25C
The valve devices 30A and 30B are provided to prevent the exhaust gas from flowing back to the other inlet when exhaust from the pneumatic device is performed to any one of the inlets. A common silencer can be achieved without obstructing the operation of the connected pneumatic equipment.

In particular, according to the present embodiment, since the inlet 26A to which the exhaust port of the air dryer 2 is connected is provided independently of the other inlets, foreign substances such as oil contained in the exhaust of the air dryer 2 may be removed. To the other device, and does not adversely affect the other device.

Further, since the inlet 25A to which the exhaust port of the brake valve 5 is connected is provided independently of the other inlets, the exhaust function of the brake valve 5 is not hindered, and accordingly, the air brake system can be properly operated. Can function.

Further, according to the present embodiment, since the silencer 20 is formed by coupling the pipe connection portion main body 22 and the muffling portion main body 24, the operation of replacing the muffling member 23 is simply performed by removing the muffling portion main body 24. Thus, workability is improved.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention.

For example, in the above embodiment, the case where the present invention is applied to a vehicle air brake system has been described.
The present invention is not limited to this, and can be effectively applied to a system including pneumatic devices such as a press machine and an automatic door.

[0031]

As described above, according to the pneumatic system silencer of the present invention, a common silencer can be achieved without obstructing the operation of each pneumatic device, thereby increasing the installation space. This makes it possible to design a pneumatic system with a high degree of freedom.

According to the second aspect of the present invention, it is possible to prevent foreign matter such as oil contained in the exhaust air of the compressed air drying apparatus from flowing into another device, and to prevent adverse effects on the other device. be able to.

According to the third aspect of the present invention, it is possible to prevent a delay in releasing the brake and to allow the air brake system to function properly without obstructing the exhaust function of the brake valve.

According to the fourth aspect of the present invention, since the silencer is formed by coupling the pipe connection portion main body and the muffling portion main body, the operation of replacing the muffling member can be performed only by the work of removing the muffling portion main body. Performance can be improved.

[Brief description of the drawings]

FIG. 1 is a piping configuration diagram of a pneumatic system to which the present invention is applied.

FIG. 2 is a side sectional view of a silencer for a pneumatic system according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 air compressor (air compression device) 2 air dryer (compressed air drying device) 5 brake valve 6 relay valve 7 pressure control valve 8 pressure control valve 11 relay valve 12 pressure control valve 13 pressure control valve 20 silencer 21A exhaust pipe 21B exhaust pipe 21C Exhaust pipe 22 Pipe connection part main body 23 Noise reduction member 24 Noise reduction part main body 25A Inlet 26A Inlet 27A Inlet 30A Valve device 30B Valve device 40 Exit

Claims (4)

[Claims] 1. A pneumatic system silencer used in a pneumatic system provided with a plurality of pneumatic devices and connected to an exhaust port of the pneumatic device, wherein the exhaust ports of the plurality of pneumatic devices are connected. A plurality of inlets are formed, and a valve device is provided to prevent the exhaust from flowing back to the other inlet when exhaust is performed from the pneumatic device to any one of the plurality of inlets. Silencer for pneumatic system. 2. The pneumatic device includes a compressed air drying device for drying compressed air supplied from an air compression device and removing foreign substances contained in the compressed air. 2. The air according to claim 1, wherein the compressed air is caused to flow backward to discharge moisture and foreign matter from an exhaust port, and an inlet to which the exhaust port of the compressed air drying device is connected is provided independently of another inlet. Silencer for pressure system. 3. The pneumatic system is an air brake system, the air brake system including a brake valve that discharges compressed air in response to a driver's operation, and an inlet to which an exhaust port of the brake valve is connected. 3. The silencer for a pneumatic system according to claim 1, wherein the silencer is provided independently of another inlet. 4. A pipe connection part main body in which the plurality of inlets are formed and a muffling part main body in which a muffling member is housed are formed separately, and the pipe connection part main body and the muffling part main body are detachable. The silencer for a pneumatic system according to any one of claims 1 to 3, wherein the silencer is coupled to a pneumatic system.