JPS6316027A - Compressed air source apparatus - Google Patents

Abstract

PURPOSE:To obtain a compressed air source apparatus capable of increasing the lowering of a dew point in accordance with use environment and having high productivity, by arranging two compressed air dryers having the same capacity in series and providing a change-over valve for blocking the mutual communication of both of them at the time of a regeneration cycle. CONSTITUTION:Compressed air discharged from an air compressor 1 is allowed to flow in a main body A from the inlet 2a of a first compressed air dryer 2 to dry an adsorbent layer and a part of said compressed air is stored in a regeneration tank B while the remainder thereof is allowed to flow in a second compressed air dryer 3 from the outlet 2b of the dryer 2 through a change-over valve 4 to dry the adsorbent bed in the main body A and a part of the compressed air flowing in the dryer 3 is stored in the regeneration tank B while the remainder thereof is stored in a compressed air storage tank 6. When the internal pressure of the storage tank 6 reaches predetermined one, the emitting operation of the compressor 1 is stopped by the signal of a governer device 7 and the change-over valve 4 is changed over to block the communication of the dryers 2, 3 and, at the same time, the exhaust valves C of both dryers 2, 3 are opened to allow dry compressed air to flow backward to the respective main bodies A from the regeneration tanks B to regenerate the adsorbent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a compressed air source device that includes a compressed air drying device and is capable of supplying dry compressed air to an air circuit.

[Conventional technology]

Conventionally, this type of compressed air source device was
There is one described in Publication No. 53615.

This device is used, for example, in the air brake system of a vehicle, but if the compressed air discharged from the air compressor is supplied directly to each device in the brake system, the condensed water contained in the compressed air will flow into these devices. Therefore, in the pneumatic system connecting the air compression equipment and the compressed air storage tank, a compressed air drying equipment for reducing the moisture contained in the compressed air to a predetermined level and a renewable adsorbent in the equipment are regenerated. It is equipped with a regeneration tank (or regeneration tank section) for

[Problem that the invention seeks to solve]

This conventional device uses a single compressed air dryer, so if the environmental conditions in which it is used are harsh, the amount of adsorbent must be increased to obtain the desired level of drying. Compressed air drying equipment becomes larger.

In other words, the dew point lowering effect of dry compressed air that has passed through a layer of a predetermined amount of adsorbent is constant, so if the usage environment is harsh and the dew point drop is low, the amount of adsorbent can be increased to increase the overall adsorption capacity. It is necessary to increase it.

For this reason, conventionally, when the usage environment differs significantly, a compressed air drying device created according to the usage environment is used. , which is undesirable because it reduces productivity. To avoid this, for example, it is possible to arrange two compressed air dryers with the same capacity in series, but simply arranging them in series makes it difficult to obtain a reliable and sufficient regeneration effect. .

This invention was made to solve the above problem.
It is an object of the present invention to provide a compressed air source device that can increase productivity as compared to conventional devices and can further reduce dew point to a large extent.

[Means to solve the problem]

In order to achieve the above object, the first invention includes the following:
A second compressed air drying device is provided in series with the first compressed air drying device, and a switching valve is provided to cut off communication with each other during a regeneration cycle. A regeneration pipe line for supplying regeneration air from the compressed air storage tank side is provided between the compressed air drying device on the air compression device side and the compressed air storage tank.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is an air compression device (compressor)
Its discharge port is connected to the inlet 2a of the first compressed air drying device 2 through piping. Reference numeral 3 designates a second compressed air drying device, the inlet of which is connected to the outlet 2b of the compressed air drying device 2 through a piping and a switching valve 4, and the outlet 3b is connected to a check pulp 5 through a piping. It is connected to a compressed air reservoir 6 via. The compressed air drying device 2 stores a predetermined amount of regenerated adsorbent therein, and is connected to a main body A through which the above-mentioned population 2a opens, and is connected to the top of the main body A to store a part of the dry compressed air flowing out from the main body A. The main body A is further provided with a discharge valve C at the lower part thereof to cut off communication between the inside and the exhaust port.

This discharge valve C is normally closed, but opens when the control boat 2c receives a pneumatic signal from the outside. The same applies to the second compressed air drying device 3, which has a control boat 3C. A governor device 7 monitors the pressure in the compressed air storage tank 6 and sends an unload air pressure signal to the air compressor l when the pressure rises to a first predetermined value. This unload air pressure signal is simultaneously transmitted to the control boat 2C of the compressed air drying device 2.3.
23C and is also supplied to the switching valve 4.

The inlet and outlet of this switching valve 4 are always in communication, but
Upon receiving the unload air pressure signal, communication between the inlet and the outlet is cut off. The unload air pressure signal disappears when the pressure in the compressed air reservoir 6 drops to a second predetermined value.

Next, the operation of this device will be explained.

The compressed air discharged by the air compressor 1 flows into the main body A from the inlet 2a of the first compressed air drying device 2. The dried compressed air (dry compressed air) that rises through the layer of the agent and is dried during this period flows into the regeneration tank B, where a part is stored, and the rest flows out from the outlet 2b.
In the second compressed air drying device 3, which flows into the second compressed air drying device 3 through the switching valve 4, the inflowing dry compressed air is adsorbed in the main body A, as in the first compressed air drying device 3. The air flows upward through the agent layer, flows into the regeneration tank B and is partially stored there, and the rest flows into the compressed air storage tank 6 and is stored there.

When the pressure in the compressed air storage tank 6 increases and reaches the first predetermined pressure, the governor device 7 generates an unload air pressure signal, so the air compressor 1 stops its discharge operation,
The switching valve 4 switches to cut off communication between the recompressed air drying devices 2 and 3, and at the same time, the discharge valves C of the compressed air drying devices 2 and 3 are switched off.
The valve opens and the adsorbent regeneration cycle begins. That is,
Dry compressed air slowly flows back from the regeneration tank B of the compressed air drying devices 2 and 3 to each main body A, and the dry compressed air flows down through the layer of adsorbent in the main body A while regenerating the adsorbent. and leaks into the atmosphere from the exhaust port.

When the compressed air in the compressed air storage tank 6 is consumed by the brake system and the pressure within the device 6 drops to the second predetermined pressure, the unload air pressure signal disappears and the air compressor l
starts loading.

In this way, this embodiment uses two compressed air drying devices 2 and 3 arranged in series, so if the surrounding environment is the same, a large amount of compressed air can be used compared to the conventional method. It can be dried and stored. Moreover, each of the compressed air drying devices 2 and 3 receives regeneration air from a dedicated regeneration tank section B during the regeneration operation, and is provided with a switching valve 4 so that the regeneration tank B of the compressed air drying device 2 This prevents the compressed air for regeneration in the re-drying device from being unnecessarily exhausted from the discharge valve C of the compressed air drying device 3. Can be played.

In addition, as mentioned above, the two compressed air dryers 2 and 3 can be used without reducing the regeneration efficiency.
The dew point can be lowered significantly, and compressed air with a desired level of dryness can be obtained even if the operating environment becomes harsher.

[Second Embodiment of the Invention] In the embodiment shown in FIG. 2, a compressed air drying device 20 having a structure without a regeneration tank section is used as a first compressed air drying device connected to the air compressing device 1. It is used. This compressed air drying device 20 has a main body A that houses a regenerated adsorbent and an exhaust valve C, and an outlet 20a formed in the main body A is connected to a switching valve 4 (a first switching valve ) to the inlet of the second compressed air drying device 3. Reference numeral 8 denotes a regeneration pipe line for the first compressed air drying device 20, in which a regeneration tank 9, a throttle 10, a check valve 11, and a second switching valve 12 are provided. There is. One of the connection ports of the regeneration tank 9 connects to a first compressed air drying bag via a throttle 10 and a check valve 11! 20, and the other connection port is connected to the second switching valve 1.
It is connected to a compressed air storage tank 6 via piping 2. The switching valve 12 receives an unload air pressure signal in the same way as the switching valve 4, and is normally open, but when it receives an unload air pressure signal from the governor device 7, it closes and connects the regeneration tank 9 with compressed air. The storage tanks 6 are cut off. The other configurations are the same as those in FIG.

In this device, all of the dry compressed air that has passed through the adsorbent layer in the first compressed air drying device 20 flows into the second compressed air drying device 3, and the dry compressed air that has flowed into the main body It ascends and passes through the adsorbent layer in A, and enters the regeneration tank part B.
A part of the air flows into the compressed air storage tank 6 and is stored there, and the rest flows into the compressed air storage tank 6 and is stored there. And the compressed air storage tank 6
A part of the dry compressed air that has flowed into the tank 8 flows into the regeneration tank 8 through the switching valve 12 and is stored therein.

When the pressure in the compressed air storage tank 6 increases and reaches the first predetermined pressure, the governor device 7 generates an unload air pressure signal, so the air compressor 1 stops its discharge operation,
- When the switching valves 4 and 12 are switched together, the recompressed air drying device 2
0 and 3 are cut off, and the regeneration tank 9 and the compressed air storage tank 6 are cut off. At the same time, the exhaust valves C of the compressed air drying devices 20 and 3 are opened to start the adsorbent regeneration cycle. . That is, in the compressed air drying device 20, dry compressed air passes from the regeneration tank 9 through the throttle 10 and check valve 12 in sequence, and in the compressed air drying device 3, dry compressed air flows back from the regeneration tank portion B to the main body A. The dry compressed air then flows down through the layer of adsorbent in the recompressed air drying device 20.3 while regenerating the adsorbent and flows out into the atmosphere from the exhaust port.

According to this embodiment, the compressed air drying device 20 on the air compressing device 1 side is regenerated by a portion of the compressed air that has passed through the two compressed air drying devices 20 and 3 and is stored in the compressed air storage tank 6. Therefore, compared to the case where a part of the compressed air that has passed only through the compressed air drying device 20 is used for regeneration,
Since the humidity of the compressed air for regeneration is lower, the compressed air drying device 20 can be regenerated more satisfactorily.

〔Effect of the invention〕

As explained above, this invention allows a compressed air source device to be configured by connecting a plurality of compressed air drying devices with the same capacity without reducing the regeneration ability of each compressed air drying device, so that it can be adapted to the usage environment. By simply increasing or decreasing the number of compressed air drying devices as needed, it is possible to obtain the required drying and regenerating capacity, eliminating the need to prepare multiple types of compressed air drying devices as in the past. can increase production.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing an embodiment of the first invention, and FIG. 2 is a flowchart showing an embodiment of the second invention. 1...Air compression device, 2.3.20-Compressed air drying device, 4.12--Switching valve, 6-...Compressed air storage tank, 7
- Governor device, 8 - Regeneration pipe line, 9 - Regeneration tank, B - Regeneration tank section of the compressed air drying device.

Claims (2)

[Claims] (1) An air compression device that compresses air, a compressed air drying device that dries the compressed air discharged from the air compression device using a renewable adsorbent, a compressed air storage tank that stores the dried compressed air, and a compressed air storage tank that stores the dried compressed air. a governor device that disables the operation of the air compression device when the pressure in the air storage tank increases to a first predetermined pressure and enables the operation when the pressure in the air storage tank decreases to a second predetermined pressure; A compressed air source device comprising: a regeneration control device that distributes air through the adsorbent and then releases it to the outside air; a second compressed air drying device is provided in series with the compressed air drying device; A compressed air source device equipped with a switching valve that shuts off communication with each other. (2) An air compression device that compresses air, a compressed air drying device that dries the compressed air discharged from the air compression device using a renewable adsorbent, a compressed air storage tank that stores the dried compressed air, and a compressed air storage tank that stores the dried compressed air. a governor device that disables the operation of the air compression device when the pressure in the air storage tank increases to a first predetermined pressure and enables the operation when the pressure in the air storage tank decreases to a second predetermined pressure; A compressed air source device comprising: a regeneration control device that distributes air through the adsorbent and then releases it to the outside air; a second compressed air drying device is provided in series with the compressed air drying device; A switching valve is provided to cut off communication between the two compressed air drying devices, and regeneration air is supplied from the compressed air storage tank between the compressed air drying device on the air compressor side and the compressed air storage tank. A compressed air source device equipped with a supply regeneration pipe.