JP2530601Y2 - Hose mask automatic backup device - Google Patents

Description

[Detailed description of the invention] [Industrial application field] In the invention, an abnormality occurs in the primary supply air source that supplies air to the hose mask used in dangerous work such as petroleum-related, civil engineering-related, etc. The present invention relates to a hose mask automatic backup device that automatically supplies air from a secondary supply air source when air pressure decreases.

[Prior art] Conventionally, the pressure drop of the primary supply air is visually and audibly detected with a pressure gauge or a pressure switch or an electric buzzer, and the air is supplied from the secondary supply air source by manual operation, and then the primary supply air source is shut off. There are known ways to do this.

[Problems to be solved by the invention] However, in the above-mentioned conventional methods, human operations are often relied upon, and even with training in handling, all actions taken by humans in an emergency can behave in accordance with the training. It is difficult to expect it to be taken, and it is difficult to maintain a perfect condition for safety.

In addition, it is difficult to say that sufficient surveillance can be performed from a psychological point of view, because it is difficult for a person to stick for surveillance and wait for surveillance for operations that do not know whether or not it will occur. Economic losses remained a problem.

The present invention has been made in view of such conventional circumstances,
The purpose is to automatically supply air from the secondary supply air source when the air supply pressure drops due to an abnormality in the primary supply air source that supplies air to the hose mask, thereby ensuring worker safety. It is an object of the present invention to provide a hose mask automatic backup device in which trouble is less likely to occur because electricity is not required for switching an air supply source.

[Means for Solving the Problems] To achieve the above object, the hose mask automatic backup device of the present invention is connected to a primary supply air source and a secondary supply air source, and is continuously connected to the primary supply air source in normal times. A pressure setting valve switch that detects the pressure drop of the supplied primary supply air and discharges pilot air when the pressure drops is provided, a relay valve is connected to the pressure setting valve switch, and further, a relay valve is connected to the pressure setting valve switch. An operating valve is connected, the relay valve receives pilot air from the pressure setting valve switch to switch and discharges pilot air, and the operating valve receives pilot air from the relay valve to supply air. Switch source from primary supply air source to secondary supply air source.

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

Fig. 1 shows the hose mask automatic backup device of the present invention.
FIG. 2 is a perspective view of FIG. 2, FIG. 2 is a working state diagram incorporating the hose mask automatic backup device 30 of FIG. 1, and FIG. 3 is a device connection diagram.

Before use, the primary supply air source 25, the secondary supply air source 16 and the hose mask face plate 20 are connected to the hose mask automatic backup device 30 via the primary supply air connection nozzle 28, the secondary supply air connection nozzle 27 and the discharge side nozzle 26. Respectively.

In the hose mask automatic backup device 30, following the primary supply air connection nozzle 28, the supply side stop valve 1, check valve 2, air filter 3, mist separator 4, first pressure regulator 5, first line pressure Total 6, Second
The line pressure gauge 29, the first input section of the first operating valve 14, the discharge side stop valve 15, and the discharge side nozzle 26 are connected in series.

A pilot air line branched from the first line pressure gauge 6 is connected to an input side of the pressure setting valve 7 and is connected to a spring which biases the pressure setting valve 7 in one direction.

The output side of the pressure setting valve 7 is connected to the one-way pressing side of the relay valve 8, and the input side of the relay valve 8 is connected to an intermediate portion between the second line pressure gauge 29 and the input side of the first operating valve 14. The other side pressing side of the relay valve 8 is connected between the second line pressure gauge 29 and the input side of the first operating valve via the manually switched mechanical valve 9. The portion X of the relay valve 8 indicates that the port has been closed to prevent air from leaking to the outside.

The output side of the relay valve 8 is the input side of the second operated valve 12 urged in one direction by a spring and the opposite side of the spring urged, and the third operated valve urged in one direction by a spring.
13 are connected to the input side, the spring-biased opposing side, and the spring-operated opposing side of the first operating valve 14 urged in one direction by a spring.

The output side of the second operating valve 12 is a volume control valve
Connected to air horn 10 via 11.

The output side of the third operating valve 13 is connected to the input of the second operating valve 12, and the cylinder 19 of the secondary supply air source 16 is connected to the first operating port via the second pressure regulator 17 and the pressure gauge 18.
Are connected to the second input of the operating valve 14 and the input of the third operating valve 13, respectively.

At the time of use, first, while looking at the first line pressure gauge 6 for measuring the pressure of the governor supply air supplied from the primary supply air source 25, turn the handle of the first pressure regulator 5 and turn the primary supply air Adjust the set pressure to about 4 kg / cm ² .

Next, the pilot valve pressure is set to the pressure setting valve 7.
Set the spring pressure to switch when the pressure becomes ² kg / cm ² or less.

As a result, when the pressure of the primary supply air detected by the first line pressure gauge 6 decreases to ² kg / cm ^{2, the} pressure setting valve 7 is switched by the spring pressure to output pilot air, and the pilot air is received. Relay valve 8
Switches to one side and outputs pilot air.

The first, second, and third operating valves 14, 12, and 1 receive pilot air from the relay valve 8.
3 is switched, the supply source of the air supplied to the hose mask face body 20 is switched from the primary supply air source 25 to the secondary supply air source 16, and the air horn 10 is activated to issue an alarm.
The volume of the air horn 10 is adjusted by a volume control valve 11.
The secondary supply air is supplied continuously at a pressure of 4 kg / cm ² .

Further, by supplying the secondary supply air in place of the primary supply air, the moving state of the first, second and third operating valves 14, 12 and 13 is also maintained.

Then, when the pressure of the primary supply air is restored, the pressure setting valve 7 is returned to the original position against the spring pressure, and there is no force acting on the pressure of the relay valve 8, and the mechanical valve 9 is operated in this state. Thereby, the primary air is supplied to the right of the relay valve 8 via the mechanical valve 9, and the relay valve is reset to the previous state.

The switching pressure of the hose mask automatic backup device 30 is confirmed as follows.

Close the discharge side stop valve handle 15 and then
After confirming that the line pressure gauge 29 indicates 4 kg / cm ² , close the supply side stop valve 1 and gradually open the discharge side stop valve handle 15 while watching the line pressure gauge 29. Check the pressure at which the alarm is triggered. This pressure becomes the set pressure of the hose mask automatic backup device 30.

Therefore, the pressure at which the air supply source switches can be easily adjusted, and the set pressure can be easily confirmed. After confirming the above, the supply side stop valve 1 and the discharge side stop valve handle 15 are fully opened for use.

[Effects of the Invention] The hose mask automatic backup device of the present invention operates only by gas and does not require electricity unlike the conventional combined use of electricity and gas, so that troubles such as not operating at the time of a power failure do not occur.

In addition, if this hose mask automatic backup device is used, in a dangerous operation that may cause an oxygen deficiency condition, an abnormality occurs in the primary supply air source while using the hose mask, and the worker is immediately in a hazardous area. Therefore, even if it is necessary to supply the air necessary for evacuation, the primary supply air source can be automatically and reliably switched to the safe secondary supply air source, whereby the worker Evacuation from dangerous areas to a safe place.

[Brief description of the drawings]

FIG. 1 is a perspective view of the hose mask automatic backup device of the present invention, FIG. 2 is a working state diagram of the hose mask automatic backup device, and FIG. 3 is a device connection diagram. 1 ... supply side stop valve 2 ... check valve 3 ... air filter 4 ... mist separator 5 ... first pressure regulator 6 ... first line pressure gauge 7 ... pressure setting valve 8 ... Relay valve 9 Mechanical valve 10 Air horn 11 Volume control valve 12 Second operating valve 13 Third operating valve 14 First operating valve 15 Discharge side stop valve 16 …… Secondary supply air source 17 …… Second pressure regulator 19 …… Cylinder (150kg / cm ² ) 20 …… Hose mask face body 21 …… Waist belt 22 …… Hose mask pressure-resistant hose 23 …… Filter 24 … Connection hose 25… Primary supply air source 26… Discharge side nozzle 27… Secondary supply air connection nozzle 28… Primary supply air connection nozzle 29… Second line pressure gauge 30… Automatic hose mask backup apparatus

Claims (1)

(57) [Scope of request for utility model registration] A primary supply air source and a secondary supply air source are connected to detect a decrease in pressure of primary supply air continuously supplied from the primary supply air source in a normal state, and when the pressure decreases, a pilot air supply is detected. Is provided, a relay valve is connected to the pressure setting valve switch, an operation valve is connected to the relay valve, and the relay valve is a pilot air from the pressure setting valve switch. Receiving the pilot air from the relay valve, and switching the air supply source from the primary supply air source to the secondary supply air source. Automatic mask backup device.