JP2022100859A - Respiratory air backup device - Google Patents

Abstract

To provide a respiratory air backup device that can use various compressors as air supply sources.SOLUTION: A respiratory air backup device comprises: a compressed air receiving part 3 for receiving compressed air from a compressor; a respiratory air sending part 4 for sending respiratory air to an air line hose H2; a main flow passage 7 connecting the compressed air receiving part 3 and the respiratory air sending part 4; a filter device 16; air cylinders 8; an auxiliary flow passage 9 for supplying air discharged from the air cylinder 8 to the main flow passage 7; a CO sensor 11 for always detecting a CO concentration in the main flow passage 7; and an air supply source switching device 12. The air supply source switching device 12 allows supply of the respiratory air from the compressor to an air sending mask when a detected value of the CO concentration is less than a reference value, or allows supply pf the respiratory air from the air cylinder 8 to the air sending mask when the detected value of the CO concentration is equal to or more than the reference value.SELECTED DRAWING: Figure 1

Description

The present invention relates to a breathing air backup device provided between a compressor and an air supply mask.

Conventionally, a compressor for an air supply mask including a compressor and an air cylinder for backup is known (Patent Document 1). This air supply mask compressor is extremely safe because it can continue to supply breathing air to the air supply mask by switching the air supply source to an air cylinder in the event of an emergency such as a compressor failure or power failure. Is high.

Japanese Unexamined Patent Publication No. 2012-217663

By the way, since various compressors are used at construction sites, it is desirable that various compressors can be used as an air supply source for the air supply mask.

However, in the air supply mask compressor of Patent Document 1, since the compressor and the air cylinder for backup are integrated, various compressors cannot be used. Many types of compressors are not intended for the supply of breathing air. For example, when an engine compressor is used, there is a risk that air mixed with CO in the exhaust gas of the engine will be sent. There is. Therefore, it is necessary to take sufficient safety measures in order to enable various compressors as an air supply source to the air supply mask.

Therefore, an object of the present invention is to provide a breathing air backup device that can use various compressors as an air supply source for an air supply mask.

The breathing air backup device of the present invention is a breathing air backup device provided between the compressor and the air supply mask, from the compressed air receiving portion to which the hose extending from the compressor is connected and the air supply mask. The main flow path connecting the breathing air delivery section to which the extending hose is connected, the compressed air receiving section and the breathing air delivery section, and the main flow path for purifying the air flowing to the breathing air delivery section. The filter device provided in the above, an air cylinder filled with compressed air for backup, a sub-channel for supplying compressed air for backup discharged from the air cylinder to the main flow path, and the inside of the main flow path. When the CO sensor that constantly detects the CO concentration of the air and the CO concentration detected by the CO sensor are less than the reference value, the compressed air receiving unit is kept in a cutoff state between the main flow path and the sub flow path. When the detection value of the CO concentration by the CO sensor becomes equal to or higher than the reference value, the auxiliary flow path is switched to the open state, and the air cylinder is used for breathing. It is characterized by having an air supply source switching device that enables the flow of air to the air delivery unit.

In the breathing air backup device configured as described above, the compressed air is kept in a cutoff state between the main flow path and the sub flow path during normal operation in which the CO concentration detected value by the CO sensor is less than the reference value. Allows air to flow from the receiving section to the breathing air sending section. This allows the compressor to be used as an air supply source to supply breathing air to the air supply mask. In addition, the breathing air backup device can switch the secondary flow path to the open state when the CO concentration detected by the CO sensor is abnormal above the standard value, allowing air to flow from the air cylinder to the breathing air delivery unit. And. Thereby, the air cylinder can be used as an air supply source to supply the breathing air to the air supply mask.

According to the breathing air backup device of the present invention, even if compressed air having a CO concentration equal to or higher than the reference value is introduced from the compressor, the supply of breathing air to the air supply mask can be safely continued. Therefore, as an air supply source for the air supply mask, various compressors can be used as long as safety is not impaired, including those whose original purpose is not for supplying breathing air.

It is a schematic block diagram of the breathing air backup apparatus of one Embodiment of this invention. It is a flowchart illustrating the operation content of the control device in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[Constitution]
The breathing air backup device 1 according to the embodiment of the present invention has a device main body 2 provided with wheels 2a. A compressed air receiving portion 3 is provided at one end portion (left end portion in this example) 2b of the apparatus main body 2. A breathing air delivery unit 4 is provided at the other end (right end in this example) 2c of the apparatus main body 2. The number of the compressed air receiving unit 3 is one, while the number of the breathing air sending unit 4 is a plurality.

The compressed air receiving portion 3 is composed of a high-pressure hose connecting coupler 5 exposed from one end portion 2b of the apparatus main body 2. A high-pressure hose H1 extending from a compressor (not shown) is connected to the high-pressure hose connecting coupler 5. A hose-side coupler H1a is provided at the downstream end of the high-pressure hose H1. By connecting the high-pressure hose connecting coupler 5 and the hose-side coupler H1a to each other, it becomes possible to receive the high-pressure air sent from the compressor through the high-pressure hose H1 to the compressed air receiving unit 3. Various compressors can be connected to the high-pressure hose connecting coupler 5 via the high-pressure hose H1. The various compressors include non-lubricated compressors and refueling compressors, including engine compressors whose intended use is not for the supply of breathing air.

The breathing air delivery unit 4 is composed of an airline hose connecting coupler 6 exposed from the other end 2c of the apparatus main body 2. An airline hose H2 extending from an air supply mask (not shown) is connected to the airline hose connecting coupler 6. A hose-side coupler H2a is provided at the upstream end of the airline hose H2. By connecting the coupler 6 for connecting the airline hose and the coupler H2a on the hose side to each other, it is possible to send breathing air to the airline hose H2. Various air supply masks can be connected to the airline hose connecting coupler 6 via the airline hose H2.

Inside the main body 2, the main flow path 7 connecting the compressed air receiving section 3 and the breathing air sending section 4, a plurality of air cylinders 8 filled with compressed air for backup, and a backup discharged from the air cylinder 8 are provided. A sub-flow path 9 for supplying compressed air for use to the main flow path 7 is provided.

The main flow path 7 includes a pressure sensor 10 for measuring the air pressure in the main flow path 7, a CO sensor 11 for measuring the CO concentration in the main flow path 7, and a breather in order from the upstream side to the downstream side. A filter device 16 that purifies the air flowing to the air delivery unit 4, an air supply source switching device 12 that switches the supply source of the breathing air supplied to the air supply mask to a compressor or an air cylinder 8, and a breathing air delivery unit. A pressure regulator 15 for adjusting the pressure of the air flowing to 4 to an appropriate pressure is provided.

The air supply source switching device 12 controls the valve device 13 based on the valve device 13 provided at the portion where the main flow path 7 and the sub flow path 9 meet each other, and the signals from the pressure sensor 10 and the CO sensor 11. It has a control device 14. A three-way solenoid valve is used for the valve device 13. In this example, the valve device 13 keeps a cutoff state between the main flow path 7 and the sub-flow path 9 when the power is not supplied, and only the air from the compressed air receiving portion 3 side passes through the breathing air sending portion 4 side. At the time of energization, the sub-flow path 9 is switched to the open state, and only the air from the air cylinder 8 side is passed to the breathing air delivery unit 4 side. The control device 14 controls the valve device 13 by turning on / off the energization of the valve device 13.

[Action]
Next, the operation of the breathing air backup device 1 configured as described above will be described. When using the breathing air backup device 1, the operator connects the high-pressure hose H1 to the compressed air receiving unit 3, operates the compressor, and turns on the power of the breathing air backup device 1. After that, the operator connects the required number of airline hoses H2 to the breathing air delivery unit 4. The air sent from the compressor through the high-pressure hose H1 is introduced into the main flow path 7 from the compressed air receiving unit 3, cleaned by the filter device 16, passes through the valve device 13, and has an appropriate pressure by the pressure regulator 15. Is adjusted to. Therefore, the air that has passed through the filter device 16 and is cleaned and adjusted to an appropriate pressure by the pressure regulator 15 is supplied from the breathing air delivery unit 4 to the air supply mask through the airline hose H2.

FIG. 2 shows a flow of a series of processes executed by the control device 14 of the air supply source switching device 12. The control device 14 constantly monitors the air pressure in the main flow path 7 based on the signal from the pressure sensor 10, and constantly monitors the CO concentration in the main flow path 7 based on the signal from the CO sensor 11. The control device 14 determines whether or not the pressure in the main flow path 7 is less than the reference value (S1: pressure determination process), and if it is not less than the reference value (No in S1), the CO concentration in the main flow path 7 Is determined whether or not is equal to or greater than the reference value (S2: CO concentration determination process). If the CO concentration is not equal to or higher than the reference value (No in S2), the process returns to the pressure determination process (S1). Pressure determination process (S1) and CO concentration determination process unless the pressure in the main flow path 7 is less than the reference value (Yes in S1) or the CO concentration in the main flow path 7 is equal to or higher than the reference value (Yes in S2). (S2) is repeated. During that time, the breathing air backup device 1 performs a normal operation using the compressor as an air supply source to supply the breathing air to the air supply mask.

On the other hand, when the pressure in the main flow path 7 is less than the reference value (Yes in S1) or the CO concentration in the main flow path 7 becomes more than the reference value (Yes in S2), that is, when an abnormality occurs, the valve device 13 is immediately operated. The auxiliary flow path 9 is opened so that only the air from the air cylinder 8 side can pass to the breathing air delivery unit 4 side. As a result, the air supply source is switched from the compressor to the air cylinder 8 (S3: air supply source switching process). The compressed air discharged from the air cylinder 8 passes through the valve device 13 from the sub flow path 9 and is introduced into the main flow path 7, adjusted to an appropriate pressure by the pressure regulator 15, and then from the breathing air delivery unit 4. It is supplied to the air supply mask through the airline hose H2.

The control device 14 executes the alarm process S4 in order to notify the user of the air supply mask that the compressor has switched to the air cylinder 8 together with the air supply source switching process S3. Examples of the content of the alarm processing S4 include notification operations such as ringing an alarm bell or whistle equipped on an air supply mask, blinking an alarm lamp, and displaying an alarm message. The ringing of the alarm bell, the blinking of the alarm lamp, and the display of the alarm message can be realized by transmitting a predetermined signal from the breathing air backup device 1 to the control unit of the air supply mask by wire or wirelessly. The whistle can be rang using breathing air.

[effect]
As described above, the breathing air backup device 1 keeps the space between the main flow path 7 and the sub flow path 9 cut off during normal operation in which the CO concentration detected by the CO sensor 11 is less than the reference value. Air can be circulated from the compressed air receiving unit 3 to the breathing air sending unit 4, and when the CO concentration detected value by the CO sensor 11 is abnormal above the reference value, the auxiliary flow path 9 is immediately switched to the open state. Since the air can be circulated from the air cylinder 8 to the breathing air delivery unit 4, even if compressed air having a CO concentration equal to or higher than the standard value is introduced from the compressor, the breathing air to the air supply mask can be used. Supply can be continued safely.

For example, CO is generated from the compressor during use, high-concentration CO is mixed in the external air sucked by the compressor, etc. For some reason, air with a CO concentration above the standard value is a breathing air backup device. When introduced in 1, the air supply from the compressor to the air supply mask is cut off, the air supply from the air cylinder 8 to the air supply mask is started, and the supply of breathing air to the air supply mask is safe. Will be continued. As a result, the user of the air supply mask can secure safety by evacuating to a safe place while maintaining a safe state in which the air from the air cylinder 8 can breathe.

Therefore, according to the breathing air backup device 1, various compressors are used as an air supply source for the air supply mask, including those whose original purpose is not for supplying breathing air, as long as safety is not impaired. It becomes possible to do.

Further, the breathing air backup device 1 immediately operates the valve device 13 when the CO concentration detected value by the CO sensor 11 is abnormal to be equal to or higher than the reference value, and shuts off the air flow path flowing from the compressed air receiving unit 3. Therefore, it is possible to completely eliminate the risk that the air having a CO concentration equal to or higher than the reference value flowing from the compressed air receiving unit 3 is sent from the breathing air sending unit 4.

Further, according to the breathing air backup device 1, when a compressor unsuitable for breathing, that is, a compressor that discharges compressed air having a CO concentration equal to or higher than the reference value is connected, the compressor is used from the beginning of operation. The supply of breathing air to the air supply mask is cut off. For this reason, a compressor that is not suitable for breathing becomes virtually unusable from the beginning of operation. As a result, safety can be ensured by encouraging the use of a compressor suitable for breathing from the beginning of operation.

Further, the breathing air backup device 1 immediately switches the sub-flow path 9 to the open state even when the pressure in the main flow path 7 is less than the reference value, and the breathing air from the air cylinder 8 to the air supply mask is supplied. Since the supply is possible, the supply of breathing air to the air supply mask can be safely continued even if an abnormality such as a failure or power failure occurs in the compressor being used as an air supply source.

Further, in the event of an abnormality, the breathing air backup device 1 immediately switches the air supply source from the compressor to the air cylinder 8 and executes alarm processing, so that the air supply source has been switched to the air cylinder 8 for backup. It is possible to surely inform the worker who is working by wearing the air supply mask. The worker who receives the alarm can evacuate to a safe place while breathing by the breathing air supplied from the air cylinder 8.

Further, since the breathing air backup device 1 has a plurality of breathing air delivery units 4, the breathing air can be supplied to a plurality of air supply masks at the same time.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the air supply source is switched from the compressor to the air cylinder 8 both when the pressure of the main flow path 7 is abnormal and when the CO concentration is abnormal, but the air supply source is switched only when the CO concentration is abnormal. It may be configured. Further, the number of the breathing air delivery unit 4 and the number of the air cylinders 8 are arbitrary. Further, in the event of an abnormality, the compressor drive may be forcibly stopped by an instruction from the control device 14.

Further, in the above embodiment, the compressed air for backup discharged from the air cylinder 8 is supplied to the main flow path 7 at the downstream position of the filter device 16, but at the upstream position of the filter device 16. It may be configured to be supplied to the main flow path 7.

Further, the number of the compressed air receiving section 3 and the breathing air sending section 4 included in the breathing air backup device 1 is arbitrary. For example, the breathing air backup device of the present invention also includes one having one compressed air receiving section 3 and one breathing air sending section 4. Further, the breathing air backup device of the present invention also includes a plurality of compressed air receiving sections 3 and breathing air sending sections 4.

Further, the breathing air backup device 1 is equipped with a battery, and when the external power supply is cut off, the pressure sensor 10, the CO sensor 11, the air supply source switching device 12, etc. are maintained by the electric power from the battery. It is desirable to be able to do it.

1 Breathing air backup device 2 Device body 3 Compressed air receiving section 4 Breathing air sending section 5 High-pressure hose connecting coupler 6 Airline hose connecting coupler 7 Main flow path 8 Air bomb 9 Sub-flow path 10 Pressure sensor 11 CO sensor 12 Air supply source switching device 13 Valve device 14 Control device 15 Pressure regulator 16 Filter device H1 High pressure hose H2 Airline hose S1 Pressure judgment processing S2 CO concentration judgment processing S3 Air supply source switching processing S4 Alarm processing

Claims (4)

A breathing air backup device installed between the compressor and the air supply mask.
The compressed air receiving part to which the hose extending from the compressor is connected,
A breathing air delivery unit to which a hose extending from the air supply mask is connected,
A main flow path connecting the compressed air receiving section and the breathing air sending section,
A filter device provided in the main flow path for purifying the air flowing to the breathing air delivery unit, and
An air cylinder filled with compressed air for backup,
A sub-flow path for supplying compressed air for backup discharged from the air cylinder to the main flow path, and
A CO sensor that constantly detects the CO concentration in the main flow path,
When the detected value of the CO concentration by the CO sensor is less than the reference value, the air from the compressed air receiving section to the breathing air sending section is maintained in a cutoff state between the main flow path and the sub flow path. When the CO concentration detection value by the CO sensor becomes equal to or higher than the reference value, the sub-flow path is switched to the open state, and air can be circulated from the air cylinder to the breathing air delivery unit. An air backup device for breathing, characterized by having an air supply source switching device. The breathing air backup device according to claim 1, wherein the air supply source switching device blocks the air flow path from the compressed air receiving portion when the CO concentration detected value by the CO sensor becomes equal to or higher than the reference value. .. The breathing air backup device according to claim 1 or 2, which has a plurality of breathing air delivery units. The breathing air backup device according to claim 1, wherein the compressor includes a refueling type compressor and a refueling type compressor.

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