JP2008213764A - Compressed air feeder apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressed air feeder apparatus in which water vapor in compressed air can be removed positively and also space saving can be realized without extending any charging pipes. <P>SOLUTION: The invention of claim 1 relates to a compressed air feeder apparatus in which an air dryer is installed at a charging pipe between an air compressor and an air reserver and an air pressure governor for use in controlling an inner pressure of the air reserver to a specified pressure is installed at an unloading pipe between the air reserver and the air compressor, and characterized in that an expansion chamber provided with a drain valve is installed at a charging pipe between the air compressor and the air dryer. Then, the invention of claim 2 relates to the compressed air feeder apparatus according to claim 1 characterized in that the water drain valve is opened with an unloading signal got from the air pressure governor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a compressed air supply device installed in a large vehicle such as a truck or a bus.

Conventionally, an air brake device has been widely used in large vehicles such as trucks and buses, but compressed air as a working fluid used in the air brake device contains water vapor in the atmosphere.
This water vapor condenses into water in the air circuit, and causes corrosion, malfunction, and malfunction due to freezing in each part of the air circuit. Therefore, as shown in Patent Document 1 or FIG. An air dryer is attached to the apparatus for supplying compressed air to the apparatus to remove moisture in the compressed air.

  FIG. 2 shows a conventional example of a compressed air supply apparatus, in which 1 is an air dryer mounted on a charge pipe 7 between the air compressor 3 and the air reservoir 5, and 9 is an unwinder between the air reservoir 5 and the air compressor 3. When the air pressure of the compressed air stored in the air reservoir 5 by the air compressor 3 (internal pressure of the air reservoir 5) reaches a specified value by the air pressure governor attached to the load pipe 11, the operation of the air pressure governor 9 causes the inside of the air reservoir 5 to The pressure acts on the unload valve 13 of the air compressor 3 via the unload pipe 11 (unloader signal), and the air compressor 3 is switched to the no-load operation.

An unload pipe 15 to an exhaust valve (not shown) of the air dryer 1 is branched to an unload pipe 11 on the downstream side of the air pressure governor 9.
A granular desiccant is accommodated in the housing 17 of the air dryer 1. During the filling operation of the compressed air into the air reservoir 5, water vapor contained in the compressed air is removed by the desiccant and the air pressure governor 9 is unloaded. When the exhaust valve of the air dryer 1 is opened by the loader signal and exhausted from the drain 19, the compressed air passes through the moist desiccant and dries and regenerates the desiccant.
JP-A-10-129462

By the way, the air dryer 1 cannot remove water vapor unless the temperature of the compressed air flowing down is lower than a certain temperature, and if the temperature of the compressed air is higher than the certain temperature, the water vapor particles are small and adsorbed on the desiccant. There was a fault that would pass without.
Therefore, conventionally, the length of the charge pipe 7 between the air compressor 3 and the air dryer 1 is extended to lower the temperature of the compressed air flowing down, but the extension length is limited due to the layout of the vehicle. In addition, there is a possibility that adverse effects such as the accumulation of condensed water in the charge pipe 7 may occur due to long-term use.

  The present invention has been devised in view of such circumstances, and it is possible to reliably remove water vapor in the compressed air, and at the same time, a compressed air supply device capable of saving space without extending the charge pipe as in the prior art. The purpose is to provide.

  In order to achieve such an object, according to the first aspect of the present invention, an air dryer is attached to a charge pipe between an air compressor and an air reservoir, and an internal pressure of the air reservoir is applied to an unload pipe between the air reservoir and the air compressor. In a compressed air supply apparatus equipped with an air pressure governor for controlling to a specified pressure, an expansion chamber having a drain valve is attached to a charge pipe between the air compressor and the air dryer.

  The invention according to claim 2 is the compressed air supply device according to claim 1, wherein the drain valve is opened by an unloader signal of an air pressure governor.

  According to the first aspect of the present invention, since the expansion chamber for lowering the temperature of the compressed air is mounted between the air compressor for producing the compressed air and the air dryer for removing the water vapor contained in the compressed air, the charge pipe Compared to the conventional structure in which the temperature of the compressed air is lowered by extending the length, the temperature of the compressed air flowing into the air dryer can be lowered while saving space.

In addition, according to the present invention, since the water vapor contained in the compressed air can be drained as condensed water in the expansion chamber, the load on the subsequent air dryer 1 is reduced and sufficient dehumidification is possible.
In the invention according to claim 2, since the drain valve is opened by the unloader signal of the air pressure governor, there is no need to separately provide a drain valve opening / closing means, and the structure can be simplified. Have.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Since the configuration of the compressed air supply apparatus excluding the invention part is the same as that of the conventional example shown in FIG. The same components as those in the conventional example of FIG. 2 are denoted by the same reference numerals.
FIG. 1 is a schematic configuration diagram of a compressed air supply device according to an embodiment of claims 1 and 2, in which 21 is a charge pipe connected between an air compressor 3 and an air reservoir 5. Although the air dryer 1 is attached to the charge pipe 21, the charge pipe 21 between the air dryer 1 and the air compressor 3 is formed shorter than the charge pipe 7 of FIG. 2 to save space.

A tank-shaped expansion chamber (chamber) 23 is attached to the charge pipe 21 between the air dryer 1 and the air compressor 3, and a drain 27 having a drain valve 25 is connected to the expansion chamber 23.
An unload pipe 29 is branched from the unload pipe 15 and connected to the drain valve 25. When the internal pressure of the air reservoir 5 reaches a specified value as described above, the unloader of the air pressure governor 9 is unloaded. The air compressor 3 is switched to the no-load operation by the signal, and at the same time, the drain valve 25 is opened by the unloader signal to open the drain 27. A coil spring (not shown) is attached to the drain valve 25, and the drain 27 is closed by the spring force of the coil spring after the valve is opened.

  Since the compressed air supply device 31 according to the present embodiment is configured as described above, the air compressed by the air compressor 3 is discharged to the charge pipe 21 at a high temperature and high humidity, but the compressed air is discharged to the charge pipe 21. The expanded expansion chamber 23 is expanded and depressurized, and the temperature of the expansion chamber 23 is lowered by touching the cooled expansion chamber 23. At this time, the water vapor is saturated and condensed water is generated in the expansion chamber 23.

  When the compressed air whose temperature has thus decreased flows down the air dryer 1, the water vapor in the compressed air is removed by the desiccant in the air dryer 1, and the compressed air is stored in the air reservoir 5. When the internal pressure of the air reservoir 5 reaches a specified value, the air compressor 3 is switched to no-load operation by the unloader signal of the air pressure governor 9, and the exhaust valve of the air dryer 1 is opened by this unloader signal. The exhaust gas dries and regenerates the desiccant. At the same time, the drain valve 25 is automatically opened by the unloader signal to open the drain 27, so that the condensed water accumulated in the expansion chamber 23 is drained. After that, the drain valve 25 closes the drain 27 by the spring force of the coil spring.

  As described above, in this embodiment, the expansion chamber 23 for lowering the temperature of the compressed air is mounted between the air compressor 3 that creates compressed air and the air dryer 1 that removes water vapor contained in the compressed air. Compared to the conventional example of FIG. 2 in which the length of the charge pipe 7 is extended to lower the temperature of the compressed air, the temperature of the compressed air flowing into the air dryer 1 can be lowered while saving space. became.

  According to this embodiment, since the water vapor contained in the compressed air can be drained as condensed water in the expansion chamber 23, the load on the subsequent air dryer 1 is reduced, and sufficient dehumidification is possible. Since the opening of the valve 25 is performed by the unloader signal, there is no need to separately provide an opening / closing means for the drain valve 25, and the structure can be simplified.

It is a schematic block diagram of the compressed air supply apparatus which concerns on one Embodiment of Claim 1 and Claim 2. It is a schematic block diagram of the conventional compressed air supply apparatus. DESCRIPTION OF SYMBOLS 1 Air dryer 3 Air compressor 5 Air reservoir 9 Air pressure governor 11, 15, 29 Unload piping 13 Unload valve 19 Drain 21 Charge piping 23 Expansion chamber 25 Drain valve 31 Compressed air supply apparatus

Claims (2)

Attach an air dryer to the charge pipe between the air compressor and air reservoir,
In a compressed air supply device in which an air pressure governor for controlling an internal pressure of an air reservoir to a specified pressure is attached to an unload pipe between the air reservoir and an air compressor.
A compressed air supply apparatus, wherein an expansion chamber having a drain valve is attached to a charge pipe between the air compressor and an air dryer. The compressed air supply apparatus according to claim 1, wherein the drain valve is opened by an unloader signal of an air pressure governor.

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