JP2553852Y2 - Water-sealing mechanism of water-sealed vacuum pump for deaerator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-sealing mechanism of a water-sealed vacuum pump for a deaerator applied to a water supply line to a building, an apartment or the like, in addition to heat and cooling equipment.

[0002]

2. Description of the Related Art As is well known, even in a boiler, a water heater or a cooling device, and in recent years, a building such as a building or a condominium, a deaeration device is provided as a measure for preventing internal corrosion of these devices and preventing red water in a water supply and distribution pipe. Is used. The water sealed by the water-sealed vacuum pump used in the degassing device is discharged together with the exhaust gas that has been degassed by the vacuum in the deoxygenating module. Therefore, in a water supply system of a large boiler or a building using a large amount of water, as a result of the full operation of the deoxidizer, the amount of water used by the water ring vacuum pump is also considerable. Therefore, the discharged sealed water may be returned to the circulating water tank and reused.However, the temperature of the discharged water increases due to the heat generated in the vacuum pump. Rise considerably. For this reason, the vapor pressure in the vacuum pump increases, and the performance of the vacuum pump decreases accordingly, which adversely affects the removal of dissolved gas in raw water. FIG. 3 shows an example of the deaeration device.
A cooling tank 25 provided with a heat exchanger 24 and a deoxygenation module 26 are provided in a water supply line 23 between the water supply line 1 and the treated water supply / distribution section 22, and a water seal for vacuum degassing of dissolved gas from the deoxygenation module 26. A circulating water tank 28 is provided at the outlet of the discharge pipe of the vacuum pump 27, water is stored in the circulating water tank 28, and the water is cooled by the heat exchanger 24 and supplied as sealing water for the vacuum pump 27. It has a configuration. If necessary, the circulating pump 30 provided in the sealing water circulation line 29 is driven to assist the supply of sealing water. In the figure, reference numeral 32 denotes a deaeration line. Reference numeral 31 denotes an exhaust line of a vacuum pump, and the sealed water is discharged together with the exhaust.

[0003]

The structure of the above-mentioned conventional deaerator has the following problems. In other words, in order to circulate and use the sealed water of the water-sealed vacuum pump, a cooling tank equipped with a heat exchanger in the water supply line and, in some cases, a circulating pump for circulating the sealed water are required. Costs increase. Therefore, the purpose of this invention is to provide a water-sealing mechanism for directly supplying a part of raw water from a water supply line as a water-sealing vacuum pump and returning used water to the water supply line. is there.

[0004]

According to the present invention, a deoxygenation module for removing dissolved gas in raw water is inserted into a water supply line between a raw water supply section and a treated water supply and distribution section, and water is supplied to the deoxygenation module. In a deaerator having a configuration in which a sealed vacuum pump is connected, a water supply line for supplying water to a water ring vacuum pump is connected to the water supply line, and a jet is provided between the connection point and the deoxygenation module. A pump is inserted, and a sealed water return line communicating with a discharge sealed water storage tank of the water-sealed vacuum pump is connected to a suction port of the jet pump.

[0005]

According to the invention, a part of the raw water is supplied from the water supply line through the sealed water supply line as the sealed water to the water sealed vacuum pump, and the used sealed water is stored in the discharge sealed water storage tank. After that, the water is sucked into the jet pump through the sealing water circulation line and is used again as raw water.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing an arrangement of each device in the deaerator of the present invention. In the water supply line 3 between the raw water supply unit 1 and the treated water supply / distribution unit 2, a jet pump 4, a pressure reducing valve 5, and a deoxygenation module 6 are provided. A water-sealed vacuum pump 8 is connected via the pump. The water-sealed vacuum pump 8 is connected to a water-sealing supply line 9 branched from a predetermined location on the upstream side of the jet pump 4 provided in the water-supply line 3. 11 is inserted. On the other hand, the used sealing water of the water ring vacuum pump 8 is stored in the drain sealing water storage tank 13 via the exhaust line 12. A connection between the drained water storage tank 13 and the suction port 4c of the jet pump 4 is provided by a water return line 14,
A water stop valve 16 interlocking with the float switch 15 is inserted on the way. In the figure, reference numeral 17 denotes a solenoid valve inserted into the vacuum degassing line 7.

The deoxygenating module 6 includes, for example, a large number of hollow fiber membranes, and feeds raw water inside the hollow fiber membranes.
A hollow fiber membrane deoxygenation module for removing dissolved oxygen in raw water in a process in which water is passed through the hollow fiber membrane by applying a vacuum to the outside thereof. This prevents the supply of water pressure from being applied, thereby preventing the deoxidizing module 6 from being damaged.

In the jet pump 4, as shown in the enlarged sectional view of FIG. 2, a high-pressure jet flows out of a nozzle 4a into a pipe, so that a throttle portion 4b has a low pressure. Is sucked through the sealed water return line 14 and sent to the water supply line 3 at an increased pressure.

Next, the operation of the water sealing utilization mechanism of the water ring type vacuum pump of the present invention will be described. When a command to supply raw water from the raw water supply unit 1 is issued from a controller (not shown), the solenoid valves 11 and 17 are opened via a line (not shown) and the water ring vacuum pump 8 is simultaneously driven to drive the inside of the deoxygenation module 6. Is evacuated, and degassed water is supplied to the treated water supply / distribution unit 2. On the other hand, the dissolved gas evacuated by the water-sealed vacuum pump 8 is sucked into the water-sealed vacuum pump 8 via the vacuum deaeration line 7 and discharged through the exhaust line 12 together with the used water. The water is stored in the discharge sealed water storage tank 13. Then, when the water is stored to a predetermined level in the discharge sealed water storage tank 13, the water stop valve 16 is opened in conjunction with the float switch 15, and the sealed water is sucked into the jet pump 4 via the sealed water return line 14 and used again as raw water. Is done.

[0010]

[Effects of the Invention] As described above, in the present invention, the sealed water of the water sealed vacuum pump is directly supplied from the water supply line, and the used sealed water is stored in the discharge sealed water storage tank, and then the sealed water is recirculated. Since the water is sucked into the jet pump through the line and returned to the water supply line, there is no need to cool the sealed water, and therefore, a cooling tank or a circulation pump equipped with a conventional heat exchanger becomes unnecessary, and The effect is large because the equipment cost is greatly reduced and the space is saved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a deaerator showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing the jet pump of FIG. 1;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw water supply part 2 Treated water supply / distribution part 3 Water supply line 4 Jet pump 4c Suction port 6 Deoxygenation module 8 Water ring vacuum pump 9 Sealed water supply line 13 Discharge sealed water storage tank 14 Sealed water return line

Claims (1)

(57) [Scope of request for utility model registration] 1. A deoxygenation module 6 for removing dissolved gas in raw water is inserted into a water supply line 3 between a raw water supply section 1 and a treated water supply and distribution section 2. In a deaerator having a configuration in which a pump 8 is connected, a water supply line 9 for supplying water to a water ring vacuum pump 8 is connected to the water supply line 3, and a connection point between the water supply line 3 and the deoxygenation module 6 is provided. Characterized in that a jet pump 4 is inserted into the pump, and a sealed water return line 14 communicating with a discharge sealed water storage tank 13 of the water-sealed vacuum pump 8 is connected to a suction port 4c of the jet pump 4. Water-sealing mechanism of water-sealed vacuum pump for equipment.