JPS63195500A - Air supply device - Google Patents

Abstract

PURPOSE:To perform a stable air supply by providing a controlling device, that opens by a by-pass valve by detecting the shutdown of a dehumidifying device, on the bypass valve connected in parallel with the compressed air storage tank. CONSTITUTION:Dehumidifiers 4a and 4b and a by-pass valve 5 are connected, in parallel to each other by a pipe 9, to a storage tank 3 provided to store compressed air. Due to the shutdown of the dehumidifying devices 4a and 4b, the by-pass valve 5 automatically opens when a pressure drop is detected by a pressure detector 7. Therefore, compressed air in a closure state in sent to a supply pipe 10 through the by-pass valve 5, thus supply of stabilized compressed air can be performed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an air supply device that supplies compressed air for valve driving or instrumentation in a nuclear power plant, and particularly to a stable and reliable supply of compressed air. The present invention relates to an air supply device that can be used as an air supply device.

(Prior Art) Generally, an air supply device is installed in a nuclear power plant to supply compressed air for valve driving or instrumentation. It is desired to be able to supply it stably and reliably to prevent the release of radioactivity.

A conventional air supply device is shown in FIGS. 5 and 6. Fifth
In the figure, an aftercooler 2 and a storage tank 3 are connected to an air compressor 1 via piping 9. Of these, the aftercooler 2 cools the compressed air, and the storage tank 3
is for temporarily storing compressed air. In addition, storage tank 3
A dehumidifier 4 and a bypass valve 5 are connected in parallel to each other by a pipe 9, and a supply pipe 10 is further connected to the dehumidifier 4 and the bypass valve 5 by a pipe 9.

Further, a pressure detector 7 is connected to the pipe 9 at the inlet of the supply pipe 10, and an alarm 17 is connected to the pressure detector 7 via a cable 21. Further, an operation switch 18 is connected to the bypass valve 5 via a cable 22.

In the air supply device having such a configuration, the compressed air pressurized by the air compressor 1 is sent to the aftercooler 2 through the pipe 9, where the heat generated by compression is removed and the air is sent to the storage tank 3. It will be done.

The compressed air temporarily stored in the storage tank 3 is sent to a dehumidifier 4 to remove moisture. The compressed air after dehumidification is sent to each building via piping 9 and supply piping 10.

In this case, the bypass valve 5 is closed.

The pressure of the compressed air is detected by a pressure detector 7, and if the pressure falls below a predetermined reference value, an alarm 17 generates an alarm.

On the other hand, when the dehumidifier 4 cannot be used due to inspection or failure of the dehumidifier 4, the bypass valve 5 is opened by operating the operation switch 18, thereby bypassing the compressed air from the storage tank 3 and supplying the compressed air to the piping 9. It is sent to each building via piping 10.

A control circuit for this operation switch 18 is shown in FIG. 6th
As shown in the figure, a contact 51 of an operation switch and a solenoid 52 for driving a bypass valve are connected in series between the power supply bus lines A and B. When the operating switch 18 is operated to the open side, the contact 51 is closed, the solenoid 52 is energized, the bypass valve 5 is opened, and the dehumidifier 4 is operated by bypass.

(Problems to be Solved by the Invention) Conventionally, the large mouth valve 12 of the dehumidifier was damaged due to operator malfunction, etc.
Alternatively, if the dehumidifier 4 is blocked due to operation with the outlet valve 13 closed, the pressure detector 7 detects a decrease in pressure, and the alarm 17 issues an alarm. Thereafter, the operator determines that there is an abnormality in the dehumidifying device 4, operates the operation switch 18 to the open side, opens the bypass valve 5, and performs bypass operation.

However, while the operator is operating the operation switch 18 in this way, the supply of compressed air is cut off, which may interfere with the operation of the valves or instrumentation of the nuclear power plant, causing serious problems. It was thought that it could lead to an accident.

The present invention has been made in consideration of these points,
It is an object of the present invention to provide an air supply device that can detect blockage of a dehumidifier 4 and quickly open a bypass valve 5 to provide stable and reliable supply.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides an air supply system in which a dehumidifier and a bypass valve are connected in parallel to a storage tank that temporarily stores compressed air that has been pressurized by an air compressor and cooled by an aftercooler. The device is characterized in that a control device is connected to the bypass valve to detect blockage of the dehumidifier and open the bypass valve.

(Function) According to the present invention, when the dehumidifier is blocked, the bypass valve is automatically opened by the control device, so that compressed air can be stably and reliably supplied.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1 and 2 are diagrams showing a first embodiment of an air supply device according to the present invention. In FIG. 1, aftercoolers 2a, 2b and a storage tank 3 are sequentially connected to air compressors 1a, 1b by piping 9. Among these, the aftercooler 2a.

2b is for cooling the compressed air, and the storage tank 3 is for temporarily storing the compressed air. Further, dehumidifiers 4a, 4b and a bypass valve 5 are connected in parallel to the storage tank 3 by a pipe 9, and a supply pipe 10 is further connected to the dehumidifiers 4a, 4b and the bypass valve 5 by a pipe 9. .

Further, a pressure detector 7 is connected to the pipe 9 at the inlet of the supply pipe 10, and the dehumidifiers 4a and 4b are provided with inlet valves 12a and 12b and outlet valves 13a and 13b, respectively. Furthermore, the pressure detector 7 has a cable lla.
The control device 8 is connected to the bypass valve 5 via a cable 11b.

Next, a control circuit of the control device 8 is shown in FIG. As shown in FIG. 2, a contact 51 and a contact 53, which are closed when an operation switch (not shown) is in the "close" position, are connected in parallel between the power supply buses A and B. A solenoid 52 for driving a bypass valve is connected in series with the solenoid 52 .

Furthermore, between the power supply bus As2, there is a contact 54 that closes when an operation switch (not shown) is in the "auto" position, a contact 55 that closes when a low pressure signal is received from the pressure detector 7, and a relay 5.
7 are connected in series, and contacts 56, which are closed by excitation of a relay 57, are connected in parallel to both ends of the contacts 55.

Further, the contact 53 is closed by excitation of the relay 57.

Next, the operation of this embodiment will be explained.

In the air supply device having such a configuration, the compressed air pressurized by the air compressors 1a, lb is sent through the piping 9 to the aftercoolers 2a, 2b, where the heat generated by compression is removed and further stored. Sent to tank 3. The compressed air temporarily stored in the storage tank 3 is sent to dehumidifiers 4a and 4b to remove moisture. The compressed air after dehumidification is transferred to pipe 9,
It is sent to each building via the supply piping 10. In this case, the bypass valve 5 is closed.

During normal operation, the operating switch is in the "auto" position. When the pressure detector 7 detects low pressure due to blockage of the dehumidifiers 4a and 4b, the contact 55 closes and the relay 57
is excited. When the relay 57 is energized, the contact 53 is closed, the solenoid 52 is energized, and the bypass valve 5 is automatically opened.

In this way, the compressed air that has been in the blocked state is sent to the supply pipe 10 through the bypass valve 5, so that stable supply can be achieved.

Even if the bypass valve 5 is opened and the pressure is restored and the contact 55 is opened, the contact 56 is closed and self-maintained. Therefore, the energized state of the solenoid 52 continues and the bypass valve 5 remains open, so that the supply of compressed air is ensured. Thereafter, the self-holding circuit works to maintain the open state of the bypass valve 5 until the operation switch is set to the "closed" position and the contact 54 is opened.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In the first embodiment, the blockage of the dehumidifier 4 is detected by the signal from the pressure detector 7, but in the second embodiment, the blockage of the dehumidifier 4 is detected by the signal from the pressure detector 7 in the first embodiment. The blockage of the dehumidifying device 4 is detected based on signals from the inlet valves 12a, 12b and outlet valves 13a, 13b of the device.

In FIG. 3, the inlet valves 12a, 12b are connected to the control device 8 by cables 14a, 14b, respectively, and the outlet valves 13a, 13b are connected to the control device 8 by cables 14a, 14b, respectively.
5a and 15b.

Next, a control circuit of the control device 8 is shown in FIG. As shown in FIG. 4, contacts 51 and 53, which are closed when an operation switch (not shown) is in the "close" position, are connected in parallel between the power supply bus line As2, and these contacts 51 and 53 are connected in parallel. A solenoid 52 that drives the bypass valve 5 is connected in series.

Further, a contact 64, a contact 65, and a relay 67 are connected in series between the power supply bus As2, and the contact 65 is closed when the operation switch (not shown) is in the "auto" position. The contacts 66 are connected in parallel. Further, the contact 53 is closed by the excitation of the relay 67.

In addition, there is an inlet valve 12 of the dehumidifier between the power bus lines A and B.
Parallel connection of the contact 58 which is closed by the closing signal of the outlet valve 13a and the contact 59 which is closed by the closing signal of the outlet valve 13a, and the large mouth valve 1
A relay 62 is connected in parallel with a contact 60 which is closed by a closing signal from the outlet valve 13b and a contact 61 which is closed by a closing signal from the outlet valve 13b. In addition, this relay 62
Contact 65 is closed by the excitation of .

Next, the operation of this embodiment having such a configuration will be explained.

During normal operation, the operating switch is in the "auto" position and contacts 64 are closed.

Two valves, the inlet valve 12a and the inlet valve 12b, of the dehumidifier are closed;
Or two outlet valves 13a and 13b of the dehumidifier
Valve closed, or inlet valve 12a and outlet valve 13 of the dehumidifier
When the dehumidifiers 4a and 4b are closed due to the simultaneous closing of the inlet valve 12b and the outlet valve 13a of the dehumidifier, the contacts 58 and 60 are closed, or the contacts 59 and 61 are closed, respectively. Closed, or contact 5
8 and contact 61 closed, or contact 59 and contact 60
is closed, and the relay 62 is energized.

When the relay 62 is energized, the contact 65 closes and the relay 6
7 is excited, and the self-holding contact 66 and contact 53 are closed. Then, by closing the contact 53, the solenoid 52
is excited, the bypass valve 5 is automatically opened, and compressed air can be supplied stably and reliably.

Inlet valves 12a, 12b and outlet valve 13a of the dehumidifier,
13b etc. are opened and the dehumidifiers 4a and 4b are unblocked and the contact 65 is opened, the contact 66 is closed and self-maintained. Therefore, the energized state of the solenoid 52 continues and the bypass valve 5 remains open, so that the supply of compressed air is ensured.

Thereafter, the self-holding circuit works to maintain the open state of the bypass valve 5 until the operation switch is set to the "closed" position and the contact 64 is opened.

Note that in the first embodiment, blockage of the dehumidifier 4 is detected by the signal from the pressure detector 7, and in the second embodiment, the blockage of the dehumidifier 4 is detected by the signal from the pressure detector 7.
Blockage of the dehumidifier 4 is detected by signals from the inlet valves 12a, 12b and outlet valves 13a, 13b of the dehumidifier instead of the signal from the pressure detector 7 of the embodiment.
The first embodiment and the second embodiment are combined, and the dehumidifier 4 is operated by a signal from the pressure detector 7 and a signal from the inlet valves 12a, 12b and outlet valves 13a, 13b of the dehumidifier. It may also be configured to detect occlusion.

〔Effect of the invention〕

According to the present invention, when the dehumidifier is blocked, the bypass valve is automatically opened by the control device, so that compressed air can be stably and reliably supplied. Therefore, safe plant operation can be performed without interfering with valve driving or instrumentation of the nuclear power plant.

[Brief explanation of the drawing]

1 is a schematic system diagram showing a first embodiment of the air supply device according to the present invention, FIG. 2 is a diagram showing a control circuit of the control device of FIG. 1, and FIG. 3 is a diagram showing a control circuit of the control device of FIG. FIG. 4 is a diagram showing a control circuit of the control device of FIG. 3, FIG. 5 is a schematic system diagram of a conventional air supply device, and FIG. FIG. 6 is a diagram showing a control circuit of the control device shown in FIG. 5; 1... Air compressor, 2... Aftercooler, 3...
Storage tank, 4... Dehumidifier, 5... Bypass valve, 7.
...Pressure detector, 8...Control device, 12a, 12b.
...Inlet valve, 13a, 13b... Outlet valve. Applicant's agent Yuyoshi Sato 1 Figure 4 Figure 3

Claims (1)

[Claims] In an air supply device comprising a dehumidifier and a bypass valve connected in parallel to a storage tank for temporarily storing compressed air pressurized by an air compressor and cooled by an aftercooler, blockage of the dehumidifier is detected in the bypass valve. An air supply device characterized in that a control device for opening a bypass valve is connected to the air supply device.