JP2543910Y2 - Dissolved oxygen stabilization system for deoxygenation equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] This invention is applied to cooling equipment,
The present invention relates to a dissolved oxygen stabilization system for a deoxidizer applied in a water supply line to buildings, condominiums, and the like.

[0002]

2. Description of the Related Art As is well known, a deoxygenation device for preventing internal corrosion of equipment such as a boiler, a water heater, or a cooler is provided in a water supply line for the equipment. In recent years, a deoxidizer has been used as a measure for preventing red water in a water supply / distribution pipe in a building such as a building or an apartment.

[0003] In the above-mentioned deoxygenation apparatus, a deoxygenation module is connected to a water supply line to equipment to be used, and raw water (tap water, well water, other industrial water) is passed through the deoxygenation module. In the water passing process, the inside of the deoxygenating module is evacuated to degas and remove dissolved gases in the raw water.

[0004] In this type of deoxygenator, a water ring vacuum pump having a simple structure and inexpensiveness tends to be frequently used as a means for evacuation processing. A suitable amount of water is put into a casing having a pump chamber having a substantially circular shape, and the impeller rotates slightly eccentric with the center of the casing, whereby the water is circulated along the inner wall of the casing by centrifugal force. By doing so, a substantially circular space is created in the center of the casing, and suction and discharge functions are generated by displacement of the space due to rotation of the impeller.

More specifically, as shown in FIG. 2, a conventional deoxygenating device is provided with a water supply line (33) between a raw water supply part (31) and a treated water supply and distribution part (32). Deoxygenation module (34) and flow switch (35) connected to the water supply line (33)
A water sealing solenoid valve (38) provided in a water sealing common line (37) between the water sealing vacuum pump (36), a deoxygenating module (34) and a water sealing vacuum pump (36). And a solenoid valve (40) for holding vacuum during stoppage provided in the degassing vacuum line (39).
According to such a configuration, when water is supplied from the raw water supply unit (31) to the water supply line (33), the flow switch (35) is operated to drive the water ring vacuum pump (36). At the same time, the two solenoid valves (38) and (40) are opened to perform vacuum degassing. And when the water supply stops, a water ring vacuum pump (36)
Stops, and the two solenoid valves (38) and (40) are closed.

[0006]

However, the above-described conventional oxygen scavenger has the following problems. The raw water supplied to the deoxidizer has a large change in the water temperature in summer and winter, so that the dissolved oxygen value also changes. That is, since the dissolved oxygen value is low in summer when the water temperature is high and the dissolved oxygen value is high in winter when the water temperature is low, the deoxygenated water treated by the deoxygenating apparatus also varies in its dissolved oxygen value. (See Fig. 2)

Accordingly, an object of the present invention is to provide a system for stabilizing the dissolved oxygen value of degassed water even when the temperature of raw water varies.

[0008]

That is, the present invention connects a deoxygenation module for removing dissolved gas in raw water in a water supply line between a raw water supply section and a treated water supply section, and this module. In a deoxygenation device including a water-sealed vacuum pump, the water-sealed vacuum pump and a circulating water tank having a cooling device are connected via a sealed water supply line and a discharge line, and connected to the water supply line. A control box is provided which serves to discriminate the signals from the inserted temperature sensor and the signals from the temperature sensor inserted into the water supply line and to control the signals by a cooling device.

[0009]

In the dissolved oxygen stabilizing system of the present invention, the temperature of the raw water is detected by the temperature sensor inserted in the water supply line, and the temperature is notified to the cooling device provided in the circulating water tank via the signal line and the control box. On the other hand, a temperature sensor inserted in a sealing water supply line for supplying sealing water from the circulating water tank to the water ring vacuum pump detects the temperature of sealing water and notifies the cooling device via a signal line and a control box. The notified cooling device cools the sealed water in the circulating water tank to a predetermined temperature according to a preset numerical value between the raw water temperature and the sealed water temperature. As a result, the partial pressure of water vapor in the water-sealed vacuum pump is reduced to evacuate to a lower pressure, so that the dissolved oxygen concentration of the treated water can be kept at a predetermined concentration.

[0010]

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 view showing the arrangement of each device of the deoxygenation apparatus of the present invention. In this deoxygenation apparatus, a temperature sensor (4), a pressure reducing valve (5), and a deoxygenation module (3) are provided in a water supply line (3) between a raw water supply section (1) and a treated water supply section (2). 6), and a flow switch (7) is connected. The temperature sensor (4) detects the temperature of raw water and outputs an electric signal. The pressure-reducing valve (5) prevents the supply pressure of water above a certain level from being applied to the deoxidizing module (6), and prevents the deoxidizing module (6) from being damaged.

The deoxygenation module (6) has, for example, a large number of hollow fiber membranes. Raw water is passed through the inside of the hollow fiber membrane, and a vacuum is drawn outside the hollow fiber membrane so that water passes through the hollow fiber membrane. This is a hollow fiber membrane deoxygenation module that removes dissolved oxygen in raw water in the process. The flow switch (7) is connected to the outlet side of the deoxygenation module (6) in the water supply line (3), and the flow water supplied from the water supply line (3) into the deoxygenation module (6) is Is detected and an electric signal is output.

In the present invention, the deoxygenating module (6)
A water-sealed vacuum pump (8) is used as a means for vacuum degassing, and the water-sealed vacuum pump (8)
From (3), the raw water flowing into the circulating water tank (10) through the branched tank supply line (9)
The flow path is connected via (11), the deoxygenation module (6)
Is connected to the flow path via the vacuum degassing line (12). The circulating water tank (10) further communicates with the vacuum pump (8) via a discharge line (13). The flow switch (7) is electrically connected to the water ring vacuum pump (8) and operates in response to an output signal of the flow switch (7).

The water supply line (11) has a temperature sensor.
(14), a constant flow valve (15) and a first solenoid valve (16) are provided. In addition, a second solenoid valve (1) is connected to the vacuum degassing line (12).
7) is provided, and is electrically connected to the flow switch (7) together with the first solenoid valve (16), and when the flow switch (7) detects flowing water, a detection signal is generated. Open in response to The temperature sensor (14) detects the temperature of the sealed water and outputs an electric signal.

[0014] The dissolved oxygen stabilizing system according to the present invention includes a cooling device (18) attached to the circulating water tank (10),
A control box (20) connected to the cooling device (18) via a signal line (19) and the temperature sensors (4) and (14)
It is constituted by.

(21) is a third solenoid valve provided in the tank supply line (9) branched from the water supply line (3). When the deoxidizer is driven, the third solenoid valve (21) is opened to store raw water to a predetermined water level in the circulating water tank (10), and then the solenoid valve (21) is closed.

Next, the operation of the dissolved oxygen stabilizing system for the deoxidizer will be described. When the raw water that has passed through the water supply line (3) from the raw water supply section (1) and passed through the pressure reducing valve (5) and the deoxygenation module (6) is passed through the flow switch (7), a running water detection signal is generated. In response to the output signal, the first and second solenoid valves (16) and (17) are opened, and the water ring vacuum pump (8) is operated. The deoxygenating module (6) vacuum-degass dissolved gases in raw water through a vacuum degassing line (12). When the supply of water stops, the water ring vacuum pump (8) stops, and the solenoid valves (16) and (17) close. While the water ring vacuum pump (8) is operating, the solenoid valve (16) is opened and the water supply line (1) from the circulating water tank (10) is opened.
1), the sealed water flows into the pump through the constant flow valve (15).
Further, the dissolved gas deaerated in vacuum through the vacuum deaeration line (12) is mixed with the sealing water and returned to the circulating water tank (10) through the discharge line (13).

The temperature of the raw water is detected by a temperature sensor (4) inserted in the water supply line (3) and reported to the control box (20) and the cooling device (18) via the signal line (19). On the other hand, the temperature of the sealed water flowing from the circulating water tank (10) to the sealed water supply line (11) is detected by the temperature sensor (14) and reported to the control box (20) via the signal line (19). . The notified control box (20) displays the circulating water tank based on the preset numerical value between the raw water temperature and the sealed water temperature (see Fig. 2).
(10) A cooling device to cool the sealed water inside to a predetermined temperature
(18) is controlled. By this, water ring vacuum pump (8)
Since the partial pressure of the water vapor in the inside is reduced and a vacuum is drawn to a lower pressure, the dissolved oxygen concentration of the treated water can be kept at a predetermined concentration.

[0018]

[Effect of the Invention] The present invention has the following effects because it is configured as described above. In other words, a circulating water tank equipped with a control box and a cooling device is provided via a tank supply line that branches off from the water supply line of the conventional deoxygenation device, enabling large-scale water saving without releasing sealed water. Becomes Also, since the temperature of the raw water and the sealed water is detected and the temperature of the sealed water is cooled to a predetermined value, the performance of the water-sealed vacuum pump is not reduced, and deaerated water having a predetermined dissolved oxygen concentration is obtained. be able to.

Furthermore, since the sealed water is circulated using the discharge force of the water sealed vacuum pump, a separate driving source such as a circulation pump is not required, and the water saved in the sealed water and the appropriate temperature are maintained at a minimum cost. I can do it.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an arrangement of each device of a deoxidation apparatus to which the present invention is applied.

FIG. 2 is a graph showing the relationship between raw water temperature, sealed water temperature, and dissolved oxygen concentration obtained from experimental values.

FIG. 3 is an explanatory diagram showing an arrangement of each device of a conventional oxygen scavenger.

[Explanation of symbols]

 1 Raw water supply unit 2 Treated water supply and distribution unit 3 Water supply line 4 Temperature sensor 6 Deoxygenation module 8 Water ring vacuum pump 10 Circulating water tank 11 Seal water supply line 14 Temperature sensor 18 Cooling device 19 Signal line 20 Control box

Claims (1)

(57) [Scope of request for utility model registration] A deoxygenation module (6) for removing dissolved gas in raw water is provided in a water supply line (3) between a raw water supply section (1) and a treated water supply section (2). In a deoxidizer comprising a connected water ring vacuum pump (8),
The water ring vacuum pump (8) and a circulating water tank (10) equipped with a cooling device (18) are sealed with a water supply line (11) and a discharge line.
(13) and a cooling device that discriminates each signal of a temperature sensor (4) inserted into the water supply line (3) and a temperature sensor (14) inserted into the sealed water supply line (11). A system for stabilizing dissolved oxygen for a deoxygenation device, comprising a control box (20) serving to control (18).