JPH05164651A - Compression air leakage detection device - Google Patents

Abstract

PURPOSE:To enable air leakage to be detected easily and signal transmission to a monitoring room to be made by calculating an amount of leakage based on a difference between an amount of supplied compression air and an amount of used compression air which are calculated from the number of activations and operation time of an air compressor. CONSTITUTION:If an air pressure is reduced to a set value when a selection switch 14 is set to Auto without operating an independent electric power plant facility for emergency (D/G) 17, an air compressor operation circuit 20 is operated and the number of activations and operation time are integrated 31 and 32. Namely, when there is less air leakage, operation of the air compressor 20 continues and operation time increases. On the other hand, when there is less air leakage, operation time does not continue for a long time. But, since operation-stop is repeated, the number of activations increases. Then, a memory circuit and a comparison circuit 22 compare conventional operation time with present one or conventional number of activations with present one and then judges that air leaked when it is detected that the number of operation integration time is large or the number of repetitions of operation-stop is large although the D/G 17 is not in operation and then report it to a maintenance personnel by an external alarm display circuit 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air leak detection device for a generator room such as a building where an emergency private power generation facility is installed.

[0002]

2. Description of the Related Art The role of emergency private power generation equipment is to automatically or manually start up when a commercial power source fails to supply power to important loads. Therefore, the equipment is not intended to operate all the time but to operate only in case of a power failure of the commercial power supply. There are two methods for starting the emergency private power generation equipment: the air starting method using an air compressor and the electric starting method using a battery. For medium and large capacity, the air starting method is generally used due to economical efficiency and starting stability, and recently, even for small capacity, the air starting method has become popular due to the starting stability. The air starting method is a method in which the air compressor operates and is started by the air stored in the air tank. Therefore, it is necessary to always store a certain amount of air in the air tank.

An operation stop control circuit and an air system diagram of a conventional air compressor will be described with reference to FIGS. 2 and 3. FIG. 2 shows an air system diagram, 1 is an air compressor, 2 is an air tank for storing air, 3 is a pressure gauge for sending a signal below a preset pressure or above a preset pressure, 4 is a valve, and 5 is air piping. , 6 indicates a diesel engine.

FIG. 3 shows a control circuit of the air compressor,
Is a MCCB for short-circuit protection, 8 is an electromagnetic contactor that operates and stops the air compressor, 9 is a thermal relay for overload protection, and 9b is a contact b of the thermal relay 9 (when operating, it is closed when not operating) .. 10 is a control power source (for example, AC200V).
Reference numeral 11 is a signal from the pressure gauge 3 which is ON signal when the pressure is less than the set pressure, 12
Is a signal of the pressure gauge 3 which is turned off at a set pressure or more, 13 is an auxiliary relay receiving signals 11 and 12, 13a is an auxiliary relay 1
3 a contact (ON when 13 is excited, O when not excited
FF) 14 is the automatic position of the "run-auto-stop" selector switch, 15 is the operating position of the "run-auto-stop" selector switch, and 16 is the stop position of the "run-auto-stop" selector switch.

When the "operation-automatic-stop" changeover switch is set to the operating position in this way, if the thermal relay 9 is not operating, the air compressor 1 is operated and air is accumulated in the air tank 2. When the changeover switch is set to the stop position, it stops. In this case, since each of them is a manual operation, it is operated in front of the generator panel or the auxiliary panel in the generator room. Normally, since the generator room is an unmanned state because of the emergency power generator equipment, the changeover switch is set to the automatic position 14. Next, the automatic control will be described. When the amount of air in the air tank 2 decreases and becomes equal to or lower than the set pressure, the contact 11 is turned on (at this time, the contact 12 is closed), the auxiliary relay 13 is operated, and the contact 13a is closed. At this time, if the thermal relay 9 is not excited, the electromagnetic contactor 8 is turned on and the air compressor 1 is automatically operated. After that, air collects in the air tank 2 and when the pressure exceeds the set pressure, the contact 12 turns off and the auxiliary relay 13
Is not excited and the contact 13a is opened, so that the electromagnetic contactor 8 is turned off and the air compressor 1 is automatically stopped.

In this way, when the air in the air tank 2 is reduced, the automatic operation is performed, and when the air is accumulated, the automatic stop is repeatedly performed.

Here, if there is air leakage in the air tank 2, the valve 4, the air piping 5, etc., the above-mentioned operation is continued (when there is much air leakage), and operation and stop are repeated (air leakage is small). In some cases), the result is that there is a drawback that the air leak phenomenon cannot be found because it is always unmanned.

[0008]

In the control circuit of the conventional air compressor, although the automatic operation and the stop are possible, there is a problem that the phenomenon of air leakage cannot be found out.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compressed air leak detection device capable of easily detecting an air leak phenomenon in a control circuit of an air compressor and sending a signal to a manned monitoring room.

[0010]

SUMMARY OF THE INVENTION The present invention uses a counter that counts the start-up of an air compressor, an operating time counter that integrates the operating time of the air compressor, and compressed air compressed by the air compressor. Compressed air use equipment, a compressed air use calculation function that calculates the amount of compressed air used from the start and motion conditions of this compressed air equipment, and the amount of compressed air supplied from the number of times the air compressor is started and the operating time A compressed air supply amount calculation function, a leakage amount calculation function that calculates a leakage amount from the difference between the usage amount and the supply amount, and a leakage determination circuit that detects that the leakage amount is greater than a preset set value. It is a compressed air leak detection device provided.

[0011]

According to the compressed air leakage detection device of the present invention, the compressed air using apparatus which counts the start-up of the air compressor, integrates the operating time of the air compressor, and uses the compressed air compressed by the air compressor. The amount of compressed air used is calculated from the starting and operating conditions of the air conditioner, the amount of compressed air supplied is calculated from the number of times the air compressor is started and the operating time, and the amount of leakage is calculated from the difference between the amount of use and the amount of supply. It is detected that the amount is larger than a predetermined set value.

In FIG. 1, 17 is an emergency private power generation facility (hereinafter referred to as D / G), 18 is a D / G operation system, 19 is a D / G stop system, 20 is an air compressor, an operation circuit, and 21 is. An operating time counter / counter starting circuit, 22 is a storage circuit of the operating time meter / counter integration time and the number of integrations, and a comparison circuit, 23 is an external alarm display signal, and 24 is an air leak detection device.

When the D / G is started (operated), air is always required and the air compressor operates. This air amount varies depending on the D / G capacity, but in advance, check the air amount required when the D / G operates once and the operating time of the air compressor at that time, and input it to the air leak detection device. Keep
As a result, when the D / G operates, the air compressor operates,
The operation time counter 32 counts the operation time, and the counter 31
Even if the value is counted once, the external signal is not sent out under the condition that the operating condition of the D / G and the preset operating time of the air compressor substantially match, and the operating time counter of the air compressor is stored.

Further, when the D / G is not operated, when the operation-automatic-stop changeover switch 14 is in the "automatic" position, the air is not leaked, but when the air naturally decreases, the pressure is set to the set pressure or less. When this happens, the air compressor operates and the operating time and the counter are integrated, but when the pressure exceeds the set pressure, the air compressor stops. However, since there is no air leakage, the pressure exceeds the set pressure in a short time. Since it does not operate again with natural decrease for a while, no external signal is sent out and the operation time counter of the air compressor is stored.

[0015]

EXAMPLE An example of the present invention will be described below. Figure 1
A counter 31 that counts the start-up of the air compressor, an operating time counter 32 that integrates the operating time of the air compressor, and an emergency private power generation facility 1 that uses compressed air compressed by the air compressor.
7, and a compressed air usage amount calculation function 33 for calculating the usage amount of compressed air from the starting and operating conditions of the equipment using compressed air,
A compressed air supply amount calculation function 34 that calculates the supply amount of compressed air from the number of times the air compressor is started and the operating time, and a leakage amount calculation function 3 that calculates a leakage amount from the difference between the usage amount and the supply amount.
5 shows a compressed air leakage detection device including a leakage determination circuit 36 for detecting that the leakage amount is larger than a predetermined set value, and the air compressor of the emergency private power generation facility 17 is shown. In the operation circuit 20, an air leak can be detected by the operation hour meter 32 and the counter 31, a circuit for storing them, a comparison circuit, and an external signal transmission circuit, and the maintenance personnel can be informed immediately by a display alarm or the like. This is an air leak detection circuit of the compressor control circuit.

Next, when detecting the air leakage phenomenon, D
/ G is not in operation, changeover switch 14 is "automatic"
In the state of the position, the air compressor operating circuit 20 becomes below the set pressure, and the air compressor operates. As a result, the operation time counter and the counter starting circuit 21 operate to count the total number of times of integration. If there is a large amount of air leakage, the operation of the air compressor continues, and as a result, the time of the operation hour meter increases. When air leakage is small, the operating time of the air compressor does not continue for a long time, but since the operation is stopped and repeated, the number of times of the counter increases. As a result, the storage circuit and comparison circuit 22
By comparing the conventional operation time with the current operation time, and comparing the conventional counter count number with the current count number, a long-time operation-operation-while the D / G is not operating Repeated stoppages are detected, it is judged that there is an air leak, and the maintenance personnel is notified by the external alarm display signal 23.

[0017]

According to the present invention, even in a generator room that is always unmanned, it is possible to detect an air leak from the operating time of the air compressor and notify the maintenance personnel as soon as possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a compressed air leakage detection device showing an embodiment of the invention.

FIG. 2 is an explanatory diagram of a conventional air system.

FIG. 3 is an explanatory diagram of a conventional compressor control circuit.

[Explanation of symbols]

 31 ... Counter 32 ... Running time meter 33 ... Compressed air usage calculation function 34 ... Compressed air supply amount calculation function 35 ... Leakage amount calculation function 36 ... Leakage determination circuit

Claims (1)

[Claims] 1. A counter that counts the start-up of an air compressor, an operation time counter that integrates the operation time of the air compressor, and a device using compressed air that uses compressed air compressed by the air compressor. A compressed air usage amount calculation function for calculating the usage amount of the compressed air from the starting and operating conditions of the device using compressed air, and a compressed air supply for calculating the supply amount of the compressed air from the number of times of starting the air compressor and the operating time. An amount calculation function, a leakage amount calculation function that calculates a leakage amount from the difference between the usage amount and the supply amount, and a leakage determination circuit that detects that the leakage amount is larger than a preset set value. A compressed air leak detection device provided.