JPH027271Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a dry compressed air supply system consisting of an air compressor and a dehumidifier for supplying dry compressed air to pneumatic equipment such as air cylinders and air springs. Regarding equipment.

[Conventional technology]

As a conventional example of this type of device,
There is a device described in Publication No. 27603 and U.S. Patent No. 3147095, and the air compressor used in this device is disclosed in U.S. Pat. A two-stage air compressor is common, and a device that combines these into one will be explained based on FIG.

A conventional dry compressed air supply device 1' includes a two-stage air compressor 20, an aftercooler 8 to which the discharge port of the two-stage air compressor 20 and its inlet are connected and which cools high-temperature compressed air, and the aftercooler 8. The automatic drain valve 21 is connected to the outlet of 8 and its inlet to discharge water generated by cooling, and the outlet of the automatic drain valve 21 is connected to the inlet of the automatic drain valve 21 to remove moisture from the compressed air. It consists of a dehumidifying cylinder 6. The two-stage air compressor 20 includes a low-pressure cylinder 2 that supplies compressed air at low pressure (for example, 3/Kgcm ² ).
, an intercooler 3 that cools the high-temperature compressed air discharged from the low-pressure cylinder 2, a drain valve 4 that drains water generated by cooling, and a high-pressure cylinder that supplies compressed air at high pressure (for example, 9/Kgcm ² ). 5
Consists of. The outlet of the dehumidifying cylinder 6, which is the outlet of this dry compressed air supply device 1', is the inlet of the regeneration air reservoir 11, and the check valve 22 whose forward direction is the direction of the regeneration air reservoir 11. 22 through a diaphragm 23 provided in parallel. Further, the outlet of the regeneration air reservoir 11 is connected to the source air reservoir 9 equipped with the governor 10 via a check valve 24 whose forward direction is the direction of the source air reservoir 9; The inlet of 6 is also connected to the discharge valve 13.

The operation of supplying dry compressed air by such a conventional dry compressed air supply device 1' will be explained in relation to other devices. First, the low pressure cylinders 2 to 1 of the two-stage air compressor 20
The low-pressure compressed air in the stage is discharged and sent to the intercooler 3 to be cooled, and after the water produced by this cooling is removed by the drain valve 4, it is sent to the high-pressure cylinder 5 to be sent to the second stage. of high-pressure compressed air is produced. This compressed air is sent from the outlet of the high-pressure cylinder 5, which is also the outlet of the two-stage compressor 20, to the aftercooler 8, where it is cooled, and then sent to the automatic drain valve 21, where water generated by cooling is removed. After being removed, it enters the dehumidifying tube 6, where the moisture contained in the compressed air is further removed and becomes dry air, which passes through the check valve 22 to the regeneration air reservoir 11 and from this regeneration air reservoir 11 to the check valve. It is sent to the source air reservoir 9 via 24. Then, when the air pressure in this source air reservoir 9 reaches the pressure regulation upper limit value of the governor 10,
The two-stage air compressor 20 is stopped by the control command in the direction of the broken line A from the governor 10, and the drain in the automatic drain valve 21 is discharged to the outside by the control command in the direction of the broken line B. The discharge valve 13 is opened to the atmosphere by a control command in the direction C. At the same time, the dry compressed air in the regeneration air reservoir 11 expands to atmospheric pressure by passing through the throttle 23 and flows back through the dehumidification cylinder 6 to dry and regenerate the dehumidifier, and then passes through the discharge valve. 13 to the atmosphere. When the compressed air pressure in the source air reservoir 9 falls to the pressure regulation lower limit value of the governor 10, the two-stage air compressor 20 is driven based on the control command in the direction of the broken line A, and the control command is sent in the direction of the broken line B. Automatic drain valve based on 21
At the same time, the release of the discharge valve 13 to the atmosphere is blocked by a control command in the direction of the broken line C, and as described above, the compressed air is returned to the regeneration air reservoir 11 and the source. It is fed into the air reservoir 9 in a dry state.

[Problem that the invention attempts to solve]

However, according to the above-mentioned conventional technology, since the compressed air discharged from the two-stage air compressor 20 contains a large amount of water vapor, drainage occurs between the two-stage air compressor 20 and the dehumidifying cylinder 6. During this time, freezing and rust occur in piping and equipment such as the aftercooler 8, causing breakdowns. Therefore,
Drain valve 4 provided in the dry compressed air supply device 1'
In addition, it was necessary to install a new automatic drain valve 21, install an antifreeze heater, and use antirust piping.
There is a problem that the overall production cost increases. Furthermore, since the internal volume of these automatic drain valves 21 and piping is approximately 10 in a railway vehicle, for example, if the compressed air pressure is 9 kg/cm ² , an extra 90 in air is always required, which corresponds to this capacity. There is a problem in that the extra energy used to generate compressed air is wasted.

[Means for solving problems]

In view of the above-mentioned circumstances, in order to reduce production costs and save energy, this idea concentrated the generation of condensate in the intermediate pressure area generated by the low-pressure cylinder, and placed it in the piping and equipment after the high-pressure cylinder. This was done as a technical issue to prevent the generation of condensate, and the means for achieving this is that the dehumidifying tube is provided between the intercooler and the high pressure cylinder of the two-stage air compressor.

[Effect]

According to this method, the compressed air in the intermediate pressure section from which water has been removed by the drain valve is dehumidified by the dehumidifying cylinder and then sent to the high pressure cylinder. Compressed air is supplied to the pressure section, so rust does not occur inside the pipes and equipment after the dehumidifying cylinder, and water does not freeze. Further, there is no need to provide special equipment for these measures, and the overall equipment cost can be reduced. Furthermore, since the internal volume of the air piping from the air compressor to the dehumidifier is reduced, the amount of air discharged by the discharge valve is reduced, and the amount of compressed air sent in is also reduced by that amount, reducing energy consumption. You can save money.

〔Example〕

An embodiment of this invention will be described based on FIGS. 1 to 5.

Incidentally, the same reference numerals are used for the same constituent members as in the conventional example, and the explanation thereof will be omitted.

First, the basic configuration of this invention shown in FIG. 1 will be explained.

This dry compressed air supply device 1 includes a low-pressure cylinder 2 that discharges low-pressure compressed air in the first stage, an intercooler 3 that cools the compressed air discharged from the low-pressure cylinder 2, and a cooling system using the intercooler 3. In a two-stage air compressor comprising a drain valve 4 that discharges generated water, and a second-stage high-pressure cylinder 5 that compresses the compressed air that has passed through the drain valve 4 to a higher pressure and then discharges it, the drain valve A dehumidifying cylinder 6 containing a built-in dehumidifying agent is provided between the high-pressure cylinder 4 and the high-pressure cylinder 5.

When this dry compressed air supply device 1 is connected to an air compressor and used, the air reservoir 8 such as the regeneration air reservoir or the original air reservoir, which is connected to the outlet of the high pressure cylinder 5 and the air compressor, is connected to the air compressor. It is only necessary to connect the outlet to the inlet of the connected aftercooler 7. High-pressure compressed air discharged from the high-pressure cylinder 5 is cooled by an aftercooler 7, and then sent to an air reservoir 8 and used for various purposes.

2a and 2b show a first embodiment of this invention, which differs from the basic configuration described above in that a device for regenerating the dehumidifying agent contained in the dehumidifying cylinder 6 is provided. That is, when the air pressure in the source air reservoir 9 reaches the pressure regulation upper limit value in the conventional example, the governor 1
0, the low pressure cylinder 2 and high pressure cylinder 5 are stopped, and the switching valve 12 connected to the outlet of the regeneration air reservoir 11 is switched, and the discharge connected to the inlet of the dehumidifying cylinder 6 is closed. When the valve 13 is opened, the dry compressed air stored in the regeneration air reservoir 11 is passed from the outlet to the inlet of the dehumidifying cylinder 6 through the switching valve 12, the throttle 15, and the check valve 14, and is then released from the discharge valve 13. In the process of releasing the dehumidifier into the atmosphere, the moisture contained in the dehumidifier contained in the dehumidifier tube 6 is removed, dried, and regenerated. In Fig. 2b, the discharge valve 13 is connected to the drain valve 4 instead of the embodiment shown in Fig. 2a, in which the discharge valve 13 is connected to the inlet of the dehumidifying tube 6, and the other configurations and effects are the same as the embodiment shown in Fig. 2a. be.

3a and 3b show a second embodiment of this invention, which differs from the first embodiment in that a bypass circuit 16 equipped with a throttle 15 is provided in parallel with the high-pressure cylinder 5. According to this embodiment, when the source air reservoir 9 reaches the pressure regulation upper limit value, the low pressure cylinder 2 and the high pressure cylinder 5 are stopped and the discharge valve 13 is opened based on a command from the governor 10. The dry compressed air stored in the air reservoir 11 is passed through the aperture 1 of the bypass circuit 16.
5, the dehumidifier expands adiabatically through the dehumidifying cylinder 6, passes through the dehumidifying agent in the dehumidifying cylinder 6, and is discharged from the inlet of the dehumidifying cylinder 6 via the discharge valve 13, so in this process, The moisture in the dehumidifier is removed, dried and regenerated. FIG. 3b shows the discharge valve 13
The drain valve 4 is connected to the drain valve 4 instead of the embodiment shown in FIG. 3a, in which the dehumidifier is connected to the inlet of the dehumidifying tube 6, and other configurations and effects are the same as the embodiment shown in FIG. 3a.

FIG. 4 shows a third embodiment of this invention, which differs from the second embodiment in that the outlet of the high pressure cylinder 5 is directly connected to the source air reservoir 9 and the switching valve 12 is connected directly to the source air reservoir 9.
The point is that the gate is opened and closed by a timer circuit. According to this embodiment, by automatically switching the switching valve 12 and opening the discharge valve 13 for a time determined at predetermined time intervals, dry compressed air is transferred from the source air reservoir 9 to the switching valve 12 and the throttle. 15. The dehumidifying agent enters the inlet of the dehumidifying tube 6 via the check valve 14, removes moisture from the dehumidifying agent, dries and regenerates the dehumidifying agent, and then is discharged from the same outlet via the discharge valve 13 into the atmosphere.
Then, when a predetermined time has elapsed, the switching valve 12 is automatically switched again, the discharge valve 13 is also closed, the low pressure cylinder 2 and the high pressure cylinder 5 are operated, and compressed air is stored in the source air reservoir 9. Note that the means for performing regeneration using a timer circuit can be applied to all the embodiments described above.

FIG. 5 shows a fourth embodiment of this invention. This embodiment employs a two-cylinder dehumidifier to efficiently dehumidify the dehumidifier using high-temperature dry compressed air. Connected to the inlet, this two-way switching valve 7
Connect one outlet to the inlet of the first dehumidifying cylinder 6a,
The other outlet is connected to the inlet of the second dehumidifying cylinder 6b, and the outlets of these two dehumidifying cylinders 6a, 6b are connected to the inlet of the high pressure cylinder 5 via the first check valve 18a and the second check valve 18b, respectively. Further, the outlet of the high-pressure cylinder 5 is connected to a source air reservoir 9 (not shown) via a check valve 19, and is also connected to the inlet of a switching valve 12. Further, the outlet of the switching valve 12 is connected to the outlets of the first dehumidifying cylinder 6a and the second dehumidifying cylinder 6b, respectively, via a first restrictor 15a and a second restrictor 15b. Furthermore, the switching valve 12
A timer circuit T is provided to the two-way switching valve 17 to issue a command to simultaneously switch the ventilation direction for a predetermined period of time. Note that the apertures 15a and 15b may be combined into one by changing their installation positions, as shown by reference numeral 24 in FIG.

According to this embodiment having such a configuration,
First, the compressed air that has passed through the drain valve 4 is sent to the source air reservoir 9 via the first dehumidifying cylinder 6a, the first check valve 18a, the high pressure cylinder 5, and the check valve 19, and is also sent to the source air reservoir 9 via the high pressure cylinder 5. A part of the high temperature dry compressed air is adiabatically expanded by passing through the switching valve 12 and the second throttle 15b, and after dehumidifying the dehumidifying agent in the second dehumidifying tube 6b, the air is transferred to the two-way switching valve 1.
7 and then emitted into the atmosphere. During this time, the first dehumidifier 6
In a, the air sent to the source air reservoir 9 is dehumidified, while the dehumidifying agent in the second dehumidifying tube 6b is dried and regenerated. Then, after a predetermined period of time has elapsed, the two-way switching valve 17 and the switching valve 12 are simultaneously switched by the timer circuit T, and the dehumidifying agent in the first dehumidifying cylinder 6a is dried. The air that is regenerated and sent to the source air reservoir 9 in the second dehumidifying cylinder 6b is dried.

By performing such operations alternately, dry compressed air is continuously sent to the source air reservoir via one dehumidifying cylinder, and the other dehumidifying cylinder is regenerated.

According to this embodiment, the high-temperature air discharged from the high-pressure cylinder 5 is used as regeneration air, so that
The dehumidifier is regenerated efficiently, improving dehumidification performance and saving regenerated air.

[Effect of idea]

As is clear from the above explanation, this invention installs a dehumidifying tube between the drain valve of the two-stage air compressor and the high-pressure cylinder. In addition to eliminating the need for a new drain valve because low compressed air is sent, there is no need to take rust prevention measures because rust does not occur in these piping or equipment, so equipment costs can be reduced accordingly. This can be reduced.

Furthermore, the energy required to generate compressed air equivalent to the internal volume of the drain valve and equipment can be saved.

[Brief explanation of the drawing]

1 to 5 show examples of this invention,
Fig. 1 is a circuit diagram of the basic configuration, Fig. 2a is a circuit diagram of the first embodiment, Fig. 2b is a circuit diagram of a modified part of Fig. 2a, Fig. 3a is a circuit diagram of the second embodiment, Fig. 3b 3a is a circuit diagram of a modified portion of FIG. 3a, FIG. 4 is a circuit diagram of a third embodiment, FIG. 5 is a circuit diagram of a fourth embodiment, and FIG. 6 is a circuit diagram of a conventional example. 1...Dry compressed air supply device, 2...Low pressure cylinder, 3...Intercooler, 4...Drain valve,
5...High pressure cylinder, 6...Dehumidifying cylinder.

Claims (1)

[Claims for Utility Model Registration] A first-stage low-pressure cylinder that discharges low-pressure compressed air, an intercooler that cools the compressed air discharged from the low-pressure cylinder, and discharges water generated by cooling by the intercooler. a drain valve,
and a second-stage high-pressure cylinder that compresses the compressed air that has passed through the drain valve to a higher pressure and discharges the compressed air.
In a dry compressed air supply device comprising a stage air compressor and a dehumidifying cylinder containing a dehumidifier for removing moisture from the compressed air, the dehumidifying cylinder is placed between an intercooler of the two-stage air compressor and a high-pressure cylinder. A dry compressed air supply device characterized in that: