JP2780583B2 - Water sealing cooling device of water ring vacuum pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water-sealed vacuum pump which cools used water by using air around the equipment without using a refrigerant or cold water, thereby enabling circulation reuse. It is trying to squeeze.

[0002]

2. Description of the Related Art In a water ring vacuum pump, water introduced into the pump acts as a piston and seal to create a vacuum. That is, water (sealing water) functions as a piston that sucks, compresses, and discharges gas.

[0003] Therefore, in a water-sealed vacuum pump, the heat of compression when gas is compressed is directly transmitted to the water seal, so that at the end of gas compression, the temperature of the water seal becomes higher than at the time of gas suction. Usually, this rise in water temperature is 4 to 6 ° C. Therefore, if the sealing water is to be reused, the temperature will increase unless the circulating water is cooled.

[0004] In the water ring vacuum pump, the operation of creating a vacuum using water as a piston is performed as described above.
A vacuum cannot be created below the vapor pressure of water. Since the steam pressure of water is higher as the temperature of the water is higher, the suction pressure generated by the vacuum pump is higher as the water temperature is higher. Also, as the water temperature increases, the amount of water evaporation in the vacuum pump also increases, so the proportion of the space in the pump occupied by water vapor increases, the space for sucking gas from the outside decreases, and the amount of suction gas decreases. .

[0005] This phenomenon becomes more conspicuous as the water temperature is higher and the suction pressure is lower. That is, as the water temperature increases, the performance of the pump decreases (deteriorates). This phenomenon is shown in FIG.

As is clear from FIG. 5, it is necessary to keep the water temperature low in order to obtain good pump performance. To this end, fresh water is always used for the vacuum pump in one pass (one use).
It can be made disposable, or water used once can be collected, cooled by heat exchange, and then reused.

FIGS. 6 and 7 show a typical example of a conventionally known method of cooling circulating water using a heat exchanger. As shown in the figure, water and gas discharged from a water ring vacuum pump 22 driven by an electric motor 21 are guided to a separation tank (separator tank) 23 for gas-liquid separation, and then driven by another electric motor 24. Usually, the water is sucked by the water sealing pump 25 and sent to the heat exchanger 26 where the water is cooled and injected into the vacuum pump 22.

[0008] Such prior art requires a costly heat exchanger. It requires cold water or expensive refrigerants such as ethylene glycol and calcium chloride, and is difficult to obtain. Refrigerant circulation pump,
Piping, valves, etc. are required, which increases costs. A sealing pump is required. Construction of sealing pipes, valves, etc. is complicated and requires space. Difficult to maintain. There are problems.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to use an apparatus without using a refrigerant or cold water and without using an expensive heat exchanger. Using the surrounding air, the sealed water whose temperature has risen after use with a water-sealed vacuum pump is cooled down to the original sealed water temperature or lower and circulated and reused by the vacuum pump to help save energy. The use of refrigerant or chilled water to prevent the performance of the water-sealed vacuum pump from deteriorating, eliminating the need for priming when the vacuum pump is restarted, using a refrigerant storage tank, a refrigerant circulation pipe, a refrigerant circulation pump and An object of the present invention is to provide a water-sealed vacuum pump that can omit piping and the like.

[0010]

SUMMARY OF THE INVENTION The present invention provides a means for solving the above-mentioned problems, and is directed to a water storage tank 2 for supplying sealed water.
a on a common base 2 provided with a
And a cooling tank 9 having an exhaust pipe 6 at the upper end and communicating the lower end with the water storage tank 2a are installed adjacent to each other on the same axis.
A fan 11 is attached to the opposite side of the rotating shaft to allow air to be supplied into the cooling tank 9, and the gas and the sealed water flowing out of the vacuum pump 1 are guided upward inside the cooling tank 9 so that the gas flows from the shower head 8. After being jetted, the falling water is brought into countercurrent contact with the ascending air sent by the fan 11 to cool the water. After cooling, the water is led to the water storage tank 2a, and the water is supplied to the vacuum pump 1 via the sealing water introduction pipe 12 and the foot valve 13. The gist of the invention is a water sealing cooling device of a water ring vacuum pump characterized in that suction is possible.

[0011]

The vacuum pump 1 sucks the gas from the water storage tank 2a via the water sealing introduction pipe 12 and the foot valve 13, absorbs the heat of compression of the gas in the vacuum pump 1, and raises the water temperature. While being guided upwards inside the tank 9 and spouting from the shower head 8 and falling in the cooling tank 9, it comes in contact with the air sent from the fan 11 in a countercurrent manner to take away the heat of evaporation and is cooled and then stored. Returning to the tank 2a, the vacuum pump 1 can suction again through the water sealing introduction pipe 12 and the foot valve 13, and can be circulated and used as water sealing.

[0012]

1 and 2 show an embodiment of the present invention. FIG.
FIG. 2 is a vertical sectional side view of the entire apparatus in which a pump, a fan, a cooling tank, a shower head, a water tank and the like are cut along a center line, and FIG. 2 is a plan view of the apparatus. It shows.

In FIG. 1, reference numeral 1 denotes a water ring vacuum pump, which is installed on a common base 2 having a water supply tank 2a for supplying water, and is driven by an electric motor 3. 4
Is a discharge side pipe of the vacuum pump 1 and communicates with an elbow 5. Reference numeral 6 denotes an exhaust pipe whose distal end is open to the atmosphere and whose proximal end is connected to a cooling tank bonnet 7. Reference numeral 8 denotes a shower head connected to the elbow 5, which is opened above the inside of a cooling tank 9 installed on the common base 2 adjacent to the vacuum pump 1. Reference numeral 10 denotes a demister mounted on the ceiling of the cooling tank 9, and 11 denotes a fan mounted on the non-driving side of the rotary shaft of the vacuum pump 1 for sending air into the cooling tank 9. is there. Reference numeral 12 denotes a water sealing introduction pipe, the lower end of which is open in the water storage tank 2a, and the upper end of which is connected to the vacuum pump 1 via a foot valve 13. A drain valve 14 and a ball tap 15 are attached to an end of the common base 2. Reference numeral 16 denotes a small-diameter shower hole formed in the shower head 8.

After filling the inside of the vacuum pump 1 and the common base 2 serving as a water tank with water in advance, the motor 3 is started to start the operation of the vacuum pump 1. Is generated, and the water in the common base 2 is sucked into the vacuum pump 1 from the pipe 12 through the foot valve 13 by the vacuum. The sucked water is supplied by vacuum pump 1
After sucking and compressing the gas in the inside, the gas is ejected from the shower hole 16 of the shower head 8 into the cooling tank 9 through the pipe 4 and the elbow 5, and returns into the common base 2. FIG. 3 shows the flow (flow) of this water sealing.

The circulating water thus circulated is supplied to the vacuum pump 1
Absorbs the heat of gas compression within. The temperature rise of the sealing water by the heat is usually 4 to 6 ° C. On the other hand, during operation of the vacuum pump 1, the fan 11 rotates to send air into the cooling tank 9. The sealed water whose temperature has risen as described above is cooled by contacting the air sent from the fan 11 countercurrently while falling in the cooling tank 9 like a shower.

This cooling action is the same as the action of the cooling tower based on the principle of the adiabatic cooling method utilizing the evaporation of water. Basically, 1% of water evaporates to provide a cooling effect of about 6 ° C. Therefore, the temperature of the sealed water flowing into the vacuum pump 1 can be maintained at a constant temperature by adjusting the amount of the evaporated water.

If the temperature of the air around the equipment is low, such as in winter, or if the temperature of the feed water is low, the sealing water temperature is set at 10 ° C.
° C or lower, and the performance of the vacuum pump 1 can be greatly improved. The water droplets accompanying the rising air are separated into water and water by the demister 10, the water is inverted and falls into the cooling tower 9, and the gas (air + gas) is discharged from the exhaust pipe 6 to the atmosphere. FIG. 4 shows a flow of gas + air.

When the circulating seal water evaporates due to a long operation and the water level in the common base 2 falls, the ball tap 15 is operated to supply fresh water so that the predetermined water level is always maintained. Has become.

When the operation of the pump is stopped, the water sealed in the vacuum pump 1 is stopped by the foot valve 13 and stays in the pump 1. Therefore, when the pump is restarted, the sealed water remains in the vacuum pump 1, so that a vacuum is immediately established and the vacuum pump 1 operates as a vacuum pump. It is.

[0020]

According to the present invention, an electric motor 3 and a water-sealed vacuum pump 1 driven by the electric motor 3 are provided on a common base 2 having a water storage tank 2a for supplying water, and an exhaust pipe 6 is provided at an upper end.
And a cooling tank 9 having a lower end communicating with the water storage tank 2a is installed adjacently on the same axis, and a fan 11 is attached to the non-driving side of the rotation axis of the vacuum pump 1 to send the cooling tank 9 into the cooling tank 9. The gas and sealed water flowing out of the vacuum pump 1 are guided upward in the cooling tank 9 to be spouted out of the shower head 8, and the falling water is cooled by the fan 1.
After cooling by making countercurrent contact with the rising air sent by 1,
By guiding the water to the water storage tank 2a and sucking it into the vacuum pump 1 via the sealing water introduction pipe 12 and the foot valve 13, without using refrigerant or cold water, and without using an expensive heat exchanger. Using the air around the equipment, the sealed water whose temperature has risen after use with a water-sealed vacuum pump can be cooled to below the original sealed water temperature and circulated and reused by the vacuum pump. The performance of the water-sealed vacuum pump is prevented from deteriorating without using the refrigerant or cold water that has been used, priming is not required when the vacuum pump is restarted, the refrigerant storage tank, the refrigerant circulation pipe, the refrigerant circulation pump and the pipe It is possible to provide a water-sealed vacuum pump which can omit the above.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an explanatory diagram showing a flow of water sealing.

FIG. 4 is an explanatory diagram showing flows of gas and air.

FIG. 5 is a graph showing an effect of a sealing water temperature on a suction gas amount and a suction gas pressure.

FIG. 6 is a plan view of a conventional example.

FIG. 7 is a side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum pump 2 Common base 2a Water storage tank 3 Electric motor 4 Discharge pipe 5 Elbow 6 Exhaust pipe 7 Cooling tank bonnet 8 Shower head 9 Cooling tank 10 Demister 11 Fan 12 Water sealing introduction pipe 13 Foot valve 14 Drain valve 15 Ball tap 16 Shower hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04C 25/02 F04C 19/00 F04C 29/04

Claims (2)

(57) [Claims] An electric motor (3) and a water ring vacuum pump (1) driven by the electric motor (3) on a common base (2) provided with a water tank (2a) for supplying sealed water. Exhaust pipe on top
(6) A cooling tank having a lower end communicating with the water storage tank (2a).
(9) is installed adjacently on the same axis, and a vacuum pump
A fan (11) is attached to the non-drive side of the rotating shaft of (1) so that air can be supplied into the cooling tank (9), and the vacuum pump
The gas and sealed water flowing out of (1) are guided upward inside the cooling tank (9) and jetted out of the shower head (8), and the falling water is directed to the rising air sent by the fan (11). After being cooled by flowing contact, it is led to the water storage tank (2a), and the vacuum pump 1 is passed through a water sealing introduction pipe (12) and a foot valve (13).
A water-sealing cooling device for a water-sealed vacuum pump, characterized in that suction is possible. 2. The cooling tank (9) has a demister on the ceiling.
The sealed water cooling device for a water sealed vacuum pump according to claim 1, further comprising (10).