JP5389419B2 - Vacuum pump device - Google Patents

Description

 The present invention relates to a vacuum pump device capable of sucking a fluid in a vacuum state below atmospheric pressure.

 The vacuum pump device combines an ejector, a tank, and a circulation pump, and drives the circulation pump to supply the water in the tank to the ejector, thereby generating a suction force in the suction chamber of the ejector and generating a vacuum fluid. It can be sucked.

In this vacuum pump device, an electric motor must be used to drive the circulation pump, and this vacuum pump device is installed in places where an electric motor cannot be used, for example, in an explosion-proof area of a chemical plant. There was a problem that could not be done.
JP2008-196434

  The problem to be solved is to provide a vacuum pump device which can be installed in an explosion-proof area without using an electric motor.

  The present invention is capable of sucking a fluid in a vacuum state at atmospheric pressure or lower. In the present invention, a compressed air tank for storing compressed air is disposed, and a compressed air supply pipe is connected to the compressed air tank. An air ejector using compressed air as a driving fluid is connected to the outlet side of the tank, and the suction chamber of the air ejector is communicated with a suction fluid source.

  The vacuum pump device of the present invention generates suction force in the suction chamber of the air ejector by high-pressure compressed air supplied from the compressed air tank to the air ejector by connecting the air ejector to the outlet side of the compressed air tank. Therefore, it is not necessary to use an electric motor.

  A conventionally used air ejector can be used, and an ejector including a nozzle, a suction chamber provided with a suction port, and a diffuser portion can be used.

  In FIG. 1, a vacuum pump includes a compressed air tank 1, a compressed air supply pipe 3 connected to the compressed air tank 1, two air ejectors 2 and 4, and a suction fluid pipe 5 communicating with a suction fluid source. Configure the device.

  A control valve 6 for controlling the amount of compressed air supplied to the compressed air tank 1 is attached to the compressed air supply pipe 3. A control valve 8 is also attached to a pipe line 7 communicating from the compressed air tank 1 to the air ejectors 2 and 4.

  Each of the air ejectors 2 and 4 includes suction chambers 17 and 18 having a nozzle portion and diffusers 19 and 20. The suction fluid pipe 5 into which the fluid sucked in the suction chambers 17 and 18 flows is communicated with the sides of the suction chambers 17 and 18.

A three-way switching valve 26 is interposed between the air ejectors 2 and 4. The outlet side of the air ejector 2 communicates with the three-way switching valve 26 and the branched two-way switching valve 27.

The air ejectors 2 and 4 generate a predetermined suction force in the suction chambers 17 and 18 by the high-pressure air supplied from the compressed air tank 1 and can suck the fluid from the suction fluid pipe 5. is there.

 The outlet sides of the air ejectors 2 and 4 communicate with the exhaust tank 9 integrally formed at the lower part of the compressed air tank 1 by the check valve 28 and the outlet pipe 11. Connected to the side of the exhaust tank 9 is a compressed air evacuation pipe 10 that excludes inflowing compressed air to the outside, and a liquid evacuation pipe 12 that excludes only the inflowing liquid to the outside on the lower surface of the exhaust tank 9 Connect. An air trap 13 that automatically discharges only the liquid and does not discharge compressed air is attached to the liquid exclusion pipe 12.

  The compressed air in the compressed air tank 1 is supplied to the nozzle portions built in the suction chambers 17 and 18 of the air ejectors 2 and 4, and the driving air is squeezed by the nozzle portions to become a high-speed flow, thereby reducing the suction force. The generated fluid is sucked from the suction fluid pipe 5. The sucked fluid is mixed with the driving air and supplied to the exhaust tank 9 from the outlet pipe 11 through the diffusers 19 and 20.

  When the amount of fluid sucked from the suction fluid pipes 5 of the air ejectors 2 and 4 is large, the two-way switching valve 27 is opened and the three-way switching valve 26 is operated to connect the suction fluid pipe 5 and the suction chamber 18. By doing so, the connection positions of the two air ejectors 2 and 4 are in a parallel state, and a large amount of fluid can be sucked through the suction fluid pipe 5 by both the air ejectors 2 and 4.

When the amount of fluid sucked from the suction fluid pipe 5 is small, the two-way switching valve 27 is closed and the three-way switching valve 26 is operated to connect the outlet side of the air ejector 2 and the suction chamber 18 of the air ejector 4. By doing so, the connection positions of the two air ejectors 2 and 4 are in series, and the fluid sucked from the suction fluid pipe 5 into the suction chamber 17 of the air ejector 2 passes through the three-way switching valve 26 and the other air ejector 4. Are sucked into the suction chamber 18 and discharged from the outlet pipe 11 to the exhaust tank 9.

  By generating a vacuum with compressed air supplied from the compressed air tank 1 to the air ejectors 2 and 4, an electric drive source such as an electric motor can be eliminated.

The block diagram which shows the Example of the vacuum pump apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressed air tank 2 Air ejector 3 Compressed air supply pipe 4 Air ejector 5 Suction fluid pipe 9 Exhaust tank 10 Compressed air exclusion pipe 11 Outlet pipe 12 Liquid exclusion pipe 13 Air traps 17, 18 Suction chambers 19, 20 Diffuser 26 Three-way switching valve 27 Two-way selector valve

Claims (1)

Place the compressed air tank to put pooled compressed air,
A compressed air supply pipe connected to the compressed air tank;
The compressed air to the outlet side of the compressed air tank connected to the air ejector to drive fluid,
It communicates with the aspiration fluid source inlet chamber of the air ejector,
The outlet side of the air ejector communicates with an exhaust tank,
Two air ejectors are arranged,
A first switching valve for switching whether or not the outlet side of the first air ejector communicates with the exhaust tank;
A second switching valve is provided for switching between communication between the outlet side of the first air ejector and the suction chamber of the second air ejector or communication between the suction fluid source and the suction chamber of the second air ejector. And
Connected to the side surface of the exhaust tank is a compressed air exhaust pipe that excludes the compressed air that has flowed into the outside.
A vacuum pump device , wherein an air trap that automatically discharges the flowing liquid to the outside and does not discharge the compressed air is attached to a lower portion of the exhaust tank .

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