JPH0849952A - Water temperature control and water temperature controller in mixed water supply system - Google Patents

Abstract

PURPOSE:To mix cold water with hot water and supply water at a specific temperature by detecting water temperature in a mixed water side and controlling the remaining amount of adjusting water which is mixed based on the detecting value. CONSTITUTION:City water is supplied from an adjusting water line 6 to cold water which is supplied from a tank 1 and the cold water at a specific temperature is supplied to a mixed water supply part 2. At that time, the temperature of the cold water is detected by a temperature sensor 4 and the detecting value is sent to the controller 7c of a flow rate control valve 7 through a line 8. The controller 7c compares a specific temperature, which is preset, with the detecting value, and drives a needle valve 7a by a motor 7b to rotate so that the specific city water is supplied into a water feed line 3. Thus, the needle valve 7a is finely adjusted until the temperature of mixed water in which the cold water is mixed with the city water reaches a specific temperature. When the temperature of the mixed water reaches the specific temperature, the needle valve 7a is fixed so that the cold water at a specific temperature is supplied to the mixed water supply part 2. Accordingly, the mixed water of specific temperature can be supplied to the mixed water side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed water supply system for mixing cold water and hot water to supply water having a predetermined water temperature, and more specifically, for example, supplying cold water to an air conditioner or a food cooling device. The present invention relates to a water temperature control method and a water temperature control device for water supplied to a heat exchanger of a supercooled water type ice making device.

[0002]

As is well known, a mixed water supply system for mixing cold water and hot water to supply water having a predetermined water temperature is, for example,
Although it is used in many applications such as hot water showers, all of them have an allowable temperature difference of set water temperatures of about ± 1 ° C in the mixed water supply system. Therefore, for example, in order to make circulating water of a predetermined temperature (1 ° C. ± 0.1 ° C.) to be supplied to the heat exchanger of the supercooled water type ice making device that supplies cold water as industrial water, the conventional mixed water supply described above is used. It is difficult to control the water temperature by applying the system.

As shown in FIG. 4, the supercooled water type ice making device has a circulation path 33 for communicating between the ice storage tank 31 and the heat exchanger 32 for supercooled water, and the heat exchanger 32 and the heat exchanger 32. The refrigerant circulation path 35 communicates with the refrigerator 34. This supercooled water type ice making device stores ice in the ice storage tank 31 by using late-night electric power, which has a low electricity charge,
According to the load demand, the deicing water is supplied from above the ice storage tank 31 and the cold water is taken out from the lower part of the tank.
By the way, in the operation of the ice making device, the ice storage tank 31 is filled with water, and then the refrigerator 34 is started to supply the cooling medium into the heat exchanger 32 for circulation and at the same time, the ice storage tank 31.
The water to be cooled inside is sent into the heat exchanger 32 to exchange heat,
The supercooled water is supplied into the ice storage tank 31. When ice making starts in the ice storage tank 31, the temperature of the water to be cooled which flows into the heat exchanger 32 decreases, and freezing easily occurs in the heat exchanger 32. Especially when the water temperature becomes 0.4 ° C. or less, It often freezes after driving for hours. Therefore, conventionally, as a countermeasure, the heat insulation of the circulation path 33 between the ice storage tank 31 and the heat exchanger 32 is deteriorated, or an auxiliary heat exchanger (not shown) is provided for positive heating. By way of heat exchanger 32
I was dealing with it by raising the water temperature at the entrance. However, if the water temperature at the inlet of the heat exchanger 32 is raised too high, the water temperature at the outlet of the heat exchanger 32 becomes high, and supercooled water cannot be produced.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a water temperature control method and a water temperature control device which can mix cold water and hot water to supply water having a predetermined water temperature. To do.

[0005]

The present invention has been made to solve the above problems. First, in the water temperature control method of the present invention, cold water and hot water are mixed to supply water of a predetermined water temperature. A water temperature control method in a mixed water supply system, which is characterized by detecting the water temperature on the mixed water side and controlling the flow rate of the adjusted water to be mixed based on the detected value, and the water temperature control device of the present invention is In a mixed water supply system that mixes cold water and hot water to supply water at a predetermined water temperature, the mixed water supply unit and the tank are connected by a water supply line, a temperature sensor is provided in this water supply line, and an upstream side of this temperature sensor is provided. A water supply pump is provided, and a control water line is connected to the upstream side of the water supply pump, and a flow control valve for controlling the flow rate of the control water based on a signal from the temperature sensor is provided on the control water line. It is characterized in that.

[0006]

According to the present invention, the temperature of the mixed water obtained by mixing the cold water and the hot water is detected, and the flow rate of the adjusted water to be mixed is controlled based on the detected value to supply the water having the predetermined temperature.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which a water temperature control device of a mixed water supply system is provided with a tank 1 for storing cold water, which is equipped with an appropriate cooling means. Predetermined water temperature (eg 0
(.Degree. C.) cold water is stored, and the cold water in the tank 1 is mixed with hot water (tap water) for cooling the edible pack product or the like and supplied as cooling water (mixed water) having a predetermined water temperature. That is, the tank 1 and the mixed water supply unit 2 are connected by a water supply line 3, a temperature sensor 4 is provided on the water supply line 3, and a water supply pump 5 is provided on the upstream side of the temperature sensor 4.
A regulated water line 6 is connected to the water supply line 3 on the upstream side of the water supply pump 5. A flow rate control valve 7 is inserted in the adjusted water line 6, and the flow rate control valve 7 and the temperature sensor 4 are inserted.
Are connected by line 8. As shown in FIG. 2, the flow control valve 7 includes a needle valve 7a, a motor 7b for rotating the needle valve 7a, and a controller for controlling the rotation of the motor 7b by a signal (water temperature) from the temperature sensor 4. 7c.

According to the water temperature control device having the above structure, for example, the predetermined temperature required by the mixed water supply unit 2 is 2 ° C. ± 0.1.
If the temperature is set to 0 ° C, the tap water (15 to 20 ° C) is supplied from the adjusted water line 6 to the 0 ° C cold water supplied from the tank 1, and the cold water (mixed water) having a predetermined temperature is supplied to the mixed water supply unit 2. To do.
That is, the temperature sensor 4 detects the cold water temperature, and reports the detected value to the controller 7c of the flow control valve 7 via the line 8. The controller 7c compares a preset predetermined temperature with a detected value, drives the motor 7b to rotate the needle valve 7a, and supplies a predetermined amount of tap water into the water supply line 3. Then, the needle valve 7a is finely adjusted until the water temperature of the mixed water obtained by mixing the tap water (regulated water) into the cold water reaches a predetermined temperature, and when the water temperature reaches the predetermined temperature, the needle valve 7a is fixed and the cold water at the predetermined temperature is mixed. Supply to the water supply unit 2. In the above embodiment, the controlled water is mixed with the cold water to obtain the cold water having the predetermined temperature. However, it is also suitable to mix the regulated water with the warm water to obtain the warm water having the predetermined temperature.

An embodiment of the present invention has been described in detail above with reference to FIG. 1. Next, an embodiment in which the present invention is applied to a more specific supercooled water type ice making device is shown in FIG. Based on this, a detailed description will be given. In the embodiment of FIG. 3, FIG.
As the tank 1 described in 1., the ice storage tank 10 that stores ice made from supercooled water is configured. Similar to the embodiment shown in FIG. 1, this ice storage tank 10 comprises a supercooled water heat exchanger 11 as the mixed water supply unit 2, and the subcooled water heat exchanger 11 and the ice storage tank The tank 10 is connected by the water supply line 3, and the water supply line 3
1, the temperature sensor 4 is provided, the water supply pump 5 is provided upstream of the temperature sensor 4, and the water supply line 3 upstream of the water supply pump 5 is provided with
The regulated water line 6 (tap water) is connected. As in the embodiment shown in FIG. 1, a flow rate control valve 7 is inserted in the regulated water line 6, and the flow rate control valve 7 and the temperature sensor 4 are connected by a line 8.

By the way, the supercooled water type ice making device shown in FIG.
It comprises a refrigerator 12, a supercooled water heat exchanger 11 (hereinafter referred to as a heat exchanger), and an ice storage tank 10. The refrigerator 12 uses, for example, a method of decompressing a liquefied refrigerant (for example, freon) with the expansion valve 12a and then directly cooling the water to be cooled through the heat exchanger 11 by latent heat of vaporization of the refrigerant. As shown in FIG. 3, the heat exchanger 11 has a double pipe structure in which an outer pipe 11a is formed in a spiral shape (which may be a straight line depending on the implementation) and an inner pipe 11b is inserted therein. Between the outer pipe 11a and the inner pipe 11b.
The water to be cooled supplied from 0 flows, and the refrigerant supplied from the refrigerator 12 flows into the inner pipe 11b. Therefore, the cooling water is cooled from the outer circumference of the inner pipe 11b to produce supercooled water. Refrigerator 12 and heat exchanger 1
The inner pipe 11b of No. 1 is connected via the expansion valve 12a using the refrigerant supply passage 13 and the refrigerant return passage 14 to circulate the refrigerant. On the other hand, the lower portion of the ice storage tank 10 and the inlet of the outer pipe 11a of the heat exchanger 11 are connected by the supply line 3, and the outlet of the outer pipe 11a of the heat exchanger 11 and the ice storage tank 10 are recirculated with supercooled water. It is connected via path 15.

The supercooled water type ice making device having the above-mentioned structure stores ice in the ice storage tank 10 by using late-night electric power, which has a low electricity rate, and deices water from above the ice storage tank 10 in response to load demand. To supply cold water from the bottom of the tank. By the way, in the operation of the ice making device, after the ice storage tank 10 is filled with water, the refrigerator 12 is activated to supply the cooling medium into the heat exchanger 11 for circulation and to cool the ice storage tank 10 to be cooled. Water is sent into the heat exchanger 11 to exchange heat, and supercooled water (-1 ° C to -2 ° C) is supplied into the ice storage tank 10. When ice making starts in the ice storage tank 10, the temperature of the water to be cooled flowing into the heat exchanger 11 decreases, and freezing easily occurs in the heat exchanger 11.

According to experiments by the inventors, the heat exchanger 1
When the temperature of the water flowing into 1 becomes 0.4 ° C. or less, it often freezes in a short time of operation. Therefore, by using the water temperature control method of the present invention, the temperature of the water flowing into the heat exchanger 11 is not efficiently frozen (0.7 ° C to 0.9 ° C).
The circulating water (cold water) from the ice storage tank 10 and the tap water from the regulated water line 6 are mixed in an appropriate amount by the signal from the temperature sensor 4 to make the circulating water at a predetermined water temperature and the heat exchange. It is made to flow into the container 11. Therefore, there is no freezing in the heat exchanger 11, and the ice storage tank 10
After storing a predetermined amount of ice in it, the ice storage operation is stopped. still,
At the start of the ice making operation, the flow control valve 7 is closed, and the water temperature of the circulating water is the set temperature (0.7 ° C to 0.9 ° C).
It will work if:

[0013]

As described above, according to the present invention, the water temperature on the mixed water side is detected, and based on the detected value,
Since the flow rate of the adjusted water to be mixed is controlled, the mixed water having a predetermined water temperature can be supplied to the mixed water side.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a mixed water supply system showing an embodiment of the present invention.

FIG. 2 is a schematic explanatory view showing a part of FIG. 1 in an enlarged manner.

FIG. 3 is a schematic explanatory view when applied to a heat exchanger for supercooled water in a supercooled water type ice making device as another embodiment of the present invention.

FIG. 4 is a schematic explanatory view of a conventional supercooled water type ice making device.

[Explanation of symbols]

 1 Tank 2 Mixed Water Supply / Distribution Section 3 Water Supply Line 4 Temperature Sensor 5 Water Supply Pump 6 Control Water Line 7 Flow Control Valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasutoshi Senoo 7 Horie-cho, Matsuyama-shi, Ehime Miura Research Institute Co., Ltd. (72) Inventor Koji Matsubayashi 7 Horie-cho, Matsuyama-shi, Ehime Miura Industrial Co., Ltd. (72) Inventor Master Kato 7 Horie-cho, Matsuyama-shi, Ehime Miura Industrial Co., Ltd.

Claims (2)

[Claims] 1. A water temperature control method in a mixed water supply system for mixing cold water and hot water to supply water having a predetermined water temperature, wherein the water temperature on the mixed water side is detected and the adjusted water is mixed based on the detected value. Water temperature control method in a mixed water supply system, characterized by controlling the flow rate of water. 2. In a mixed water supply system for mixing cold water and hot water to supply water having a predetermined water temperature, a mixed water supply unit 2 and a tank 1 are connected by a water supply line 3, and a temperature sensor 4 is connected to this water supply line 3. A water supply pump 5 is provided on the upstream side of the temperature sensor 4, and a control water line 6 is connected to the upstream side of the water supply pump 5, and the control water line 6 is adjusted based on a signal from the temperature sensor 4. A water temperature control device in a mixed water supply system, comprising a flow rate control valve 7 for controlling the flow rate of water.