JPS5815668Y2 - Compressed air drying equipment for vehicles - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a compressed air drying device for vehicles.

Conventionally, compressed air from a compressor is supplied to a near reservoir through a desiccant storage chamber and a check valve as a compressed air supply process, and a purge valve is opened as a desiccant re-injection process to supply compressed air from the near reservoir to an orifice and the desiccant. There is a compressed air drying device for vehicles that discharges air into the atmosphere through a storage chamber (see Japanese Patent Publication No. 43-12880). In this type of device, a purge chamber is specially arranged between the desiccant storage chamber and the near reservoir. Instead, compressed air from the near reservoir is used to form the desiccant.

In this device, the pressure in the near reservoir is detected by a pressure regulator, and the compressed air supply process and the desiccant enable process are sequentially repeated based on this detection.

In other words, when the pressure in the near reservoir exceeds the upper limit set pressure of the pressure regulator, the pressure regulator is activated to stop supplying compressed air from the compressor to the near reservoir and open the purge valve to dry the compressed air in the near reservoir. When the pressure inside the near reservoir drops below the lower limit setting pressure of the pressure regulator, the pressure regulator closes the purge valve and stops the supply of compressed air from the compressor to the near reservoir. resume.

In this way, conventional compressed air dryers for vehicles continuously repeat the compressed air supply process and the desiccant forming process, so they overuse the desiccant, etc. more than necessary, and at the beginning of the compressed air supply process, In this case, the pressure difference between the near reservoir and the desiccant storage chamber is not resolved, and the pressure in the near reservoir still flows into the desiccant storage chamber, so that the pressure in the near reservoir further decreases.

An object of the present invention is to provide a compressed air drying device for a vehicle that eliminates such drawbacks.

The present invention will be described below with reference to embodiments shown in the drawings.

The drawing shows a brake line consisting of a compressor 1, a main near reservoir 2, near reservoirs 3 and 4, a brake valve 5 and brake actuators 6 and 7, and a compressed air drying line consisting of a pressure regulator 8, a dryer 9 and a pressure control valve 10. Shown is a device with built-in equipment.

The dryer 9 has an inlet 12 connected to the compressor 1 via a line 11, an outlet 14 connected to a pressure control valve 10 via a line 13, and a line 1 to the pressure regulator 8.
A cylindrical wall 20 is disposed concentrically with respect to the cylindrical housing 19, and a desiccant is supplied thereto. A storage chamber 21 is formed.

The desiccant storage chamber 21 has an oil filter 2 in its lower opening.
A partition wall 23 is provided at the upper opening of the chamber 21, and an orifice 24 and a check valve 25 are provided in the partition wall.

The purge valve 16 is disposed at the bottom of the dryer 9, and normally the valve body 26 is biased by a spring 27 to close the exhaust port 18.
is blocked.

In addition, 28 is a desiccant. The above configuration is a conventional dryer 9
However, the present invention is characterized in that a special pressure control valve 10 is interposed between the dryer 9 and the near reservoir 2.

This pressure control valve 10 has a cylinder 29
is divided into a pressure chamber 31 and an atmospheric pressure chamber 32 by a piston 30, and a valve body 33 is loosely fitted onto the piston 30 and disposed on the pressure chamber side.

The pressure chamber 31 is connected to the inlet 34 of the near reservoir 2 and the conduit 35
The atmospheric pressure chamber 32 is provided with a port 38 that communicates with the atmosphere.

The piston 30 is urged toward the pressure chamber by a strong spring 39, and its movement is restricted by a stopper 40 formed on the cylinder 29.

The upper end of the valve body 33 fits loosely into the piston 30 and engages with the piston 30 at least when the piston moves in the direction of separation, and the weak spring 41
normally closes the port 37.

The set pressure of the spring 39 is determined so as to move the piston 30 upward with an appropriate specified pressure that is below the upper limit set pressure of the pressure regulator 8 and above the lower limit set pressure of the pressure regulator 8. The spring 41 causes the valve body 33 to close to the port 13 when the pressure on the dryer 9 side becomes slightly higher than the pressure chamber 31.
A set pressure that opens 7 may be sufficient.

The compressed air drying device for a vehicle according to the present invention operates as follows.

First, as a compressed air supply process, compressed air sent out from the compressor 1 enters the inlet 12 of the dryer 9 via the pipe 11.

The compressed air supplied to the inlet 12 passes through a passage 42 formed between the housing 19 and the cylindrical wall 20 to a hollow chamber 43 and further passes through an oil filter 22 where water droplets and oil are filtered out and a desiccant is removed. It reaches the storage room 21.

The compressed air that has flowed into the accommodation chamber 21 is
The air is dehumidified by the air and flows through the check valve 25 and orifice 24 to the outlet 14 of the dryer 9.

The compressed air sent to the outlet 14 subsequently reaches the hoard 37 of the pressure control valve 10, pushes up the valve body 33 against the spring 41, flows into the pressure chamber 31, and then flows from the pressure chamber to the port 36 and the pipe. It is supplied to the near reservoir 2 via the channel 35 and the inlet 34.

This state is maintained for several minutes.

During that time, the pressure in the near reservoir 2 increases and when it exceeds the specified pressure of the pressure control pulse 7' 1.0, the pressure in the near reservoir 2 acts on the lower surface of the piston 30 via the pipe 35, the port 36, and the pressure chamber 31. , pushes the piston upward against the spring 39.

When the piston 30 is pushed upward, the valve body 33 is also pulled up, opening the port 37 of the pressure control valve 10.

Thereafter, the compressed air sent out from the outlet 14 of the dryer 9 passes through the port 37, the pressure chamber 31, and the port 36 of the pressure control valve 10, and is continuously supplied to the near reservoir 2 via the conduit 35.

In this way, when the pressure in the near reservoir 2 increases and the pressure exceeds the upper limit set pressure of the pressure regulator 8, the pressure regulator 8 is activated and stops supplying compressed air from the compressor 1 to the near reservoir 2, and the purge valve Compressed air is sent to the indication pressure port 17 of the purge valve 16, and the pressure of the air pushes down the valve body 26 of the purge valve 16 against the spring 27, thereby opening the exhaust port 18.

Therefore, the desiccant regeneration process is immediately started.

When the purge valve 16 of the dryer 9 opens, the compressed air in the desiccant storage chamber 21 is explosively released into the atmosphere from the exhaust port 18.

At that time, the compressed air contains 28 drying agents and 2 oil filters.
2, and the water droplets, oil droplets, etc. that have adhered thereto are discharged to the atmosphere.

Subsequently, the compressed air in the near reservoir 2 passes through the pipe 35 to the port 36 of the pressure control valve 10, and from this port passes through the pressure chamber 31 and port 37, enters the outlet 14 of the dryer 9, and further passes through the orifice 24. Then, the desiccant is gradually delivered to the desiccant storage chamber 21.

The compressed air that has passed through the orifice 24 is transferred to the desiccant storage chamber 21
While expanding, it removes the moisture absorbed by the desiccant 28 and is released into the atmosphere.

Eventually, when the pressure in the near reservoir 2 falls below the specified pressure (determined by the spring 39) of the cuff freshener control valve 10, the piston 30 is pushed down by the biasing force of the spring 39, and the valve body 33 also descends accordingly, opening the port. 37 is closed.

In this way, the reheating process of the desiccant 28 is completed.

However, in this state, the pressure in the near reservoir 2 has not decreased to the lower limit set pressure of the pressure regulator 8, so the purge valve 16 remains open without issuing an operation command to the pressure regulator 8. maintain.

Thereafter, when the compressed air in the near reservoir 2 is used for brake operation etc. and the pressure drops below the lower limit set pressure of the pressure regulator 8, the pressure regulator controls the purge valve 16.
The pressure acting on the indicating pressure port 17 is extinguished.

Therefore, the valve body 26 is returned by the biasing force of the spring 27 and closes the exhaust port 18 again.

At the same time, the pressure regulator 8 restarts the supply of compressed air from the compressor 1 to the near reservoir 2.

The compressed air sent out from the compressor 1 is passed through the pipe line 11, the inlet 12, the passage 42, and the oil filter 22 as described above.
It reaches the desiccant storage chamber 21 through the.

However, the compressed air supplied to the desiccant storage chamber 21 is not immediately sent to the near reservoir 2, but is accumulated in the desiccant storage chamber 21, and only when the pressure becomes higher than the pressure inside the near reservoir 2 does the pressure control valve open. 10 and is supplied to the near reservoir 2.

In the embodiment, an orifice 24 and a check valve 25 are arranged on the partition wall 23 of the dryer 9 so as to overlap with the pressure control valve 10.
Even if the pressure control valve 4 and the check valve 25 are removed and the pressure control valve 10 is installed, the operation remains the same.

At this time, the diameter of the port 37 of the pressure control valve 10 must be appropriately selected so as to perform the same function as the orifice 24.

As described above, the compressed air drying device for a vehicle according to the present invention has no possibility that compressed air from the near reservoir will flow out to the dryer at the beginning of the compressed air supply process for supplying compressed air from the compressor to the near reservoir. Therefore, the pressure in the near reservoir never becomes lower than the lower limit set pressure of the pressure regulator, and safety is high.

In addition, even if the purge valve malfunctions and its exhaust port remains open, the compressed air in the near reservoir will not flow into the dryer, so the pressure will be at least higher than the specified pressure of the pressure control valve. can be maintained.

Moreover, the compressed air drying device for a vehicle according to the present invention has a simple structure of the pressure control valve, and the device can be made compact.

[Brief explanation of the drawing]

The drawing shows an embodiment in which a compressed air dryer for a vehicle according to the present invention is incorporated into an air brake conduit, and is a conduit diagram showing a main part thereof in a longitudinal section. 1... Compressor, 2... Air saver, 8... Pressure regulator, 9... Dryer, 10... Pressure control valve, 16... Purge valve, 21... Desiccant storage chamber, 28... Desiccant, 29...
・Cylinder, 30...Piston, 31...
...Pressure chamber, 32...Atmospheric pressure chamber, 33...
・Anterior body, 36° 37.38...port, 39・
... Spring, 40 ... Stomper 41.
... Honey.

Claims (1)

[Scope of utility model registration request] In the compressed air supply process, when the pressure in the near reservoir becomes equal to or lower than the lower limit setting pressure of the pressure regulator, the pressure regulator supplies compressed air from the compressor to the near reservoir via the desiccant storage chamber, and as a desiccant enable process, the near reservoir is When the pressure exceeds the upper limit set pressure of the pressure regulator, the pressure regulator stops the supply of compressed air from the compressor to the near reservoir and sends a signal to the purge valve to open the purge valve and direct the compressed air from the near reservoir to the orifice and desiccant. In a vehicle compressed air drying device configured to discharge air to the atmosphere through a storage chamber, a port is provided between the near reservoir and the desiccant storage chamber, and the inside of the cylinder is opened to the near reservoir side, and a port is opened to the desiccant storage chamber side. a piston separated into a pressure chamber equipped with a port and an atmospheric pressure chamber equipped with a port opened to the atmosphere, biased toward the pressure chamber side by a strong spring, and whose movement in the pressure chamber side direction is restricted by a stopper; A pressure control valve is connected to the piston, the valve body being allowed to move within a certain range and biased by a weak spring to open a port normally open to the desiccant storage chamber. Compressed air drying equipment for vehicles.