JPH0814183A - Sealing water cooling system of water sealing type vacuum pump in deaerator - Google Patents

Abstract

PURPOSE:To prevent temperature of sealing water from raising by providing a sealing water tank to a deaerator, simultaneously making the insides of the sealing water tank and a deaerating module vacuous, and making the sealing water tank inside below saturation pressure so that sealing water is cooled and circularly used. CONSTITUTION:A feed water pump 9 is stopped based on the signal of a temperature sensor 7 when water temperature in a sealing water pump 8 is raised by the rotational heat of a water sealing type vacuum pump 6, and also the channel 10a of a sealing water switching valve 10 is opened so that sealing water is supplied from a sealing water line 14 to the water sealing type vacuum pump 6 through a sealing water supply line 11. The insides of a deaerating module 4 and the sealing water tank 8 are simultaneously made vacuous by the water sealing type vacuum pump 6. A part of water is evaporated and vacuously cooled when pressure inside the sealing water tank 8 becomes below saturation pressure. The temperature sensor 7 detects when the water temperature is lowered up to a predetermined temperature so as to drive the feed water pump 9 so that the sealing water is supplied from the sealing water tank 8, and the used sealing water circulates inside the sealing water tank 8 through a sealing water circulating line 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deaerator applied to a water line for supplying water to cold / heat equipment and a food processing water line, and more particularly to a water-sealed vacuum pump used in the deaerator. Related to the sealed water cooling system.

[0002]

2. Description of the Related Art As is well known, a deaerator is installed in a water supply line for cooling and heating equipment such as a boiler, a water heater or a cooler for the purpose of preventing internal corrosion of these equipment. Further, in recent years, deaeration devices have come to be used as a measure for preventing red water in water supply and distribution pipes in buildings, condominiums, and other structures. Further, a deaerator is being used also for the production of water for food processing production in order to prevent food oxidation.

As shown in FIG. 3, in the deaerator, a deaerator module 33 is inserted into a water supply line 32 from a raw water supply unit 31 to equipment used and the like, and a vacuum suction line 34 is inserted into the deaerator module 33. Water-sealed vacuum pump 35 is connected, raw water (tap water, well water, other industrial water) is passed through the degassing module 33, and the degassing module 33 is evacuated in the course of passing water. The configuration is such that the dissolved gas in the raw water is degassed and removed. 36 in the figure
Is a sealing water supply line and 37 is a drainage line.

In this type of deaerator, a water-sealed vacuum pump, which has a simple structure and is inexpensive, tends to be frequently used as a means for performing a vacuuming process. , Put an appropriate amount of sealing water in a casing having a substantially circular pump chamber, and rotate the impeller slightly eccentric from the center of the casing by centrifugal force to circulate the sealing water along the inner wall of the casing. By doing so, a substantially circular space is created in the central portion of the casing, and the suction and discharge actions are caused by the displacement of the space due to the rotation of the impeller.

However, in the deaerator having the above structure,
There are the following problems. That is, since the sealing water used by the water-sealed vacuum pump 35 is discharged together with the exhaust gas that has been vacuum degassed by the degassing module 33, degassing is required for the water supply of large boilers and buildings that require a large amount of treated water. As a result of full operation of the apparatus, the amount of sealing water used by the water-sealing vacuum pump 35 also becomes considerable. Therefore, recently, a large amount of sealed water that has been treated for wastewater is returned to the sealed water tank and reused, but the water temperature in the sealed water tank rises due to the rotating heat of the water-sealed vacuum pump. Therefore, since the temperature of the sealed water rises, the performance of the water-sealed vacuum pump deteriorates, which adversely affects the removal of the dissolved gas in the raw water.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a sealed water cooling system which is provided with a sealed water tank to circulate and utilize the sealed water and prevent the temperature of the sealed water from rising. It is intended to be provided.

[0007]

That is, according to the present invention, a deaeration module is inserted in a water supply line between a raw water supply section and a treated water supply section, and the deaeration module is inserted through a vacuum suction line. In a deaerator having a structure in which a water-sealed vacuum pump is connected, a water-sealed tank provided with a temperature sensor for supplying water to the water-sealed vacuum pump is provided, and the water-sealed tank and the water-sealed vacuum pump are provided. Between the water supply pump and the sealing water switching valve and a sealing water return line having a drainage switching valve, and connecting the sealing water switching valve to the sealing water line and the drainage switching valve. Is connected to a sealing water discharge line, and a vacuum suction passage provided with an electromagnetic valve is provided between the vacuum suction line and the sealing water tank.

[0008]

According to the present invention, when the temperature of the water in the water sealing tank rises and reaches a predetermined temperature, the signal from the temperature sensor temporarily suspends the water sealing supply from the water sealing tank and supplies the water sealing from the water sealing line. The used sealed water is drained from the discharge line. Then, the solenoid valve of the vacuum suction path is opened to suck the vacuum in the deaeration module as well as the vacuum in the sealing water tank to cool the sealing water to a saturated pressure or less in the sealing water tank. When the water temperature of the sealing water drops and reaches a predetermined temperature, the solenoid valve is closed, the sealing water is supplied again from the sealing water tank, and the sealing water supply from the sealing water line is stopped. Thereafter, this cycle is repeated to maintain the sealed water at a predetermined water temperature.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing an arrangement of each device of a water sealing type cooling system of a water sealing vacuum pump in a deaerator of the present invention. In this deaerator, a membrane-type deaerator module 4 is inserted into a water supply line 3 between a raw water supply unit 1 and a treated water supply / distributor unit 2, and a vacuum suction line 5 is inserted into the membrane-type deaeration module 4. The water-sealed vacuum pump 6 is connected. The sealed water cooling system according to the present invention is provided with a sealed water tank 8 having a temperature sensor 7 for supplying sealed water to the water sealed vacuum pump 6, and a lower portion of the sealed water tank 8 and the water sealed vacuum pump 6 Is connected with a water supply supply line 11, and a water supply pump 9 and a water supply switching valve 10 capable of switching in two directions are provided on the way. On the other hand, the water-sealing vacuum pump 6 and the upper part of the water-sealing tank 8 are connected by a water-sealing return path 13, and a drainage switching valve 12 that can switch in two directions is provided in the middle to circulate the water-sealing. There is. A sealing water line 14 is connected to the flow passage 10a of the sealing water switching valve 10 that is not connected to the water supply pump 9, and a sealing water discharge line 15 is connected to the passage 12b of the drainage switching valve 12 that is not connected to the sealing tank 8. Connected.

The water sealing tank 8 is a closed container, and a water supply line 18 for supplying a predetermined amount (water level control means not shown) of water sealing is connected to the water sealing tank 8. A vacuum suction path 17 is connected between the upper surface of the water sealing tank 8 and the vacuum suction line 5, and a solenoid valve 16 is inserted in the middle. Reference numeral 19 in the drawing is a suction passage for introducing air into the water sealing tank 8, and a filter 20 is provided at the tip end portion thereof and a solenoid valve 21 is inserted midway. The temperature sensor 7, the water supply pump 9, the sealing water switching valve 10, the drainage switching valve 12 and the solenoid valve 1
Each of 6 and 21 communicates with a controller (not shown) via a line (not shown).

Next, the operation of the sealed water cooling system having the above structure will be described. First, the water supply line 1 in the sealed water tank 8
A predetermined amount of sealed water is stored via 8. Then, water is supplied from the raw water supply unit 1 to the water supply line 3 and, at the same time, the water seal vacuum pump 6 and the water supply pump 9 are driven to supply seal water from the seal water tank 8 through the seal water supply line 11 for use. The used sealed water is returned to the sealed water tank 8 through the sealed water return line 13. At the start of the operation, the flow path 1 of the sealing water switching valve 10
0a and the flow path 12b of the drainage switching valve 12 are closed.
Further, the solenoid valve 21 of the intake passage 19 is opened, and the vacuum suction passage 17 is opened.
Solenoid valve 16 is closed.

By operating the water-sealed vacuum pump 6, the dissolved gas is vacuum-degassed while the raw water is flowing through the membrane-type degassing module 4. Then, with the passage of time, the temperature of the water in the water sealing tank 8 rises due to the rotating heat of the water sealing vacuum pump 6, and when the temperature reaches a predetermined temperature (for example, 40 ° C.), the temperature sensor 7 detects and controls the signal. To a container (not shown). Based on the signal from the temperature sensor 7, the controller stops the water supply pump 9 and also causes the flow passage 10 of the sealing water switching valve 10
Open a and seal water from seal water line 14 to seal water supply line 11
To the water-sealed vacuum pump 6 via. On the other hand, the flow passage 12a of the seal water switching valve 12 of the seal water return line 13 is closed, the flow passage 12b is opened, and the used seal water supplied from the seal water line 14 is discharged to the outside of the system via the drain line 15. further,
In response to a signal from the controller, the electromagnetic valve 21 of the intake passage 19 is closed and the electromagnetic valve 16 of the vacuum suction passage 17 is opened to allow the water-sealed vacuum pump 6 to simultaneously degas the deaeration module 4 and the water tank 8. Evacuate. Sealing tank 8
By evacuating the inside, the pressure in the sealing water tank 8 gradually decreases, and when the pressure becomes equal to or lower than the saturation pressure of water, part of the water is evaporated and vacuum cooling is performed. Then, when the water temperature drops to a predetermined temperature (for example, 30 ° C.), the temperature sensor 7 detects it and notifies the controller of the signal.

The controller is based on the signal of the temperature sensor 7,
Signals are sent to each device in the reverse order of the above high temperature. That is,
The electromagnetic valve 16 is closed and the electromagnetic valve 21 is opened to restore the pressure in the sealed water tank 8 to the atmospheric pressure. And the drainage switching valve 12
The channel 12a is opened, the channel 12b is closed, and the channel 10a of the sealing water switching valve 10 is closed. At the same time, the water supply pump 9 is driven to supply the sealing water from the sealing tank 8 to seal the used sealing water. The water is recycled into the sealed water tank 8 through the reflux line 13.
After that, by repeating this cycle, the water temperature in the water sealing tank 8 can be kept within a predetermined temperature. The supply of sealing water evaporated by vacuum cooling is supplied from the water supply line 18 by a predetermined amount by a signal from a water level control means (not shown).

Next, an experiment was conducted on the relationship between the degree of degassing on the water to be degassed when the water-sealed vacuum pump 6 according to the present invention is used simultaneously and the temperature of the sealed water in the sealed water tank 8. It will be explained based on the values. FIG. 2 shows experimental values when 10 liters of sealed water is stored in the sealed water tank 8 and the space volume of the sealed water tank 8 is a space corresponding to 5 liters which is about half of 10 liters of sealed water. It is a diagram created based on the figure, and during normal operation (sealing water temperature of 40 ° C. or less), the vacuum pressure in the degassing module 4 is 50 torr or less and the concentration of dissolved gas at the outlet of the degassing module 4 is as shown in the figure. Is about 1
It is a little under ppm. Then, when the electromagnetic valve 16 of the vacuum suction passage 17 is opened to evacuate the sealed water tank 8, the vacuum pressure of the degassing module 4 is instantaneously about 400 to.
It rises to rr, but after about 3 seconds 50 torr during normal operation
Therefore, it was found that the degree of degassing of degassed water is not a problem in normal use. On the other hand, as for the sealing water temperature in the sealing water tank 8, it takes about 10 minutes to cool from 40 ° C. to 30 ° C. as shown in the figure.

[0015]

As described above, according to the present invention, the deaerator is provided with the sealing water tank, the inside of the sealing water tank is evacuated simultaneously with the inside of the deaeration module, and the inside of the sealing water tank is saturated. Since the sealed water is cooled and circulated in the following manner, it is possible to save the sealed water (tap water) as compared with the conventional used sealed water that has been completely drained. In addition, since the water-sealed vacuum pump can be used in common, only the water-sealing tank needs to be newly installed, which is relatively simple and requires a small equipment cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a sealed water cooling system of a water sealed vacuum pump in a deaerator embodying the present invention.

FIG. 2 is a diagram created based on experimental values of the sealed water cooling system of FIG.

FIG. 3 is an explanatory diagram showing a configuration of a conventional deaerator.

[Explanation of symbols]

 1 Raw Water Supply Section 2 Treated Water Supply / Distribution Section 3 Water Supply Line 4 Degassing Module 5 Vacuum Suction Line 6 Water Sealing Vacuum Pump 7 Temperature Sensor 8 Sealing Tank 9 Water Supply Pump 10 Sealing Water Changeover Valve 11 Sealing Water Supply Line 12 Wastewater Switching Valve 13 Sealed water return line 14 Sealed water line 15 Sealed water drainage line 16 Solenoid valve 17 Vacuum suction path

Front page continued (72) Inventor Masaaki Ochi 7 Horie-cho, Matsuyama-shi, Ehime Miura Industrial Co., Ltd.

Claims (1)

[Claims] 1. A degassing module 4 is inserted into a water supply line 3 between a raw water supply unit 1 and a treated water distribution unit 2, and a water-sealed vacuum is inserted into the degassing module 4 via a vacuum suction line 5. In a deaerator having a structure in which a pump 6 is connected, a water sealing tank 8 having a temperature sensor 7 for supplying sealing water to the water sealing vacuum pump 6 is provided, and the water sealing tank 8 and the water sealing vacuum pump are provided. 6 is connected by a water supply pump 9 and a water supply supply line 11 provided with a water supply switching valve 10 and a water supply recirculation line 13 provided with a drainage switching valve 12, and the water supply switching valve 10 is sealed with water. A vacuum suction passage 17 having a line 14 connected to it, a drain water switching valve 12 connected to a sealed water discharge line 15, and an electromagnetic valve 16 provided between the vacuum suction line 5 and the sealed water tank 8.
A cooling water cooling system for a water-sealed vacuum pump in a deaerator, characterized by being provided with.