JPH09152149A - Anti-freezing system in ice accumulative type cold water device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a positive prevention of freezing at a super-cooling cold water heat exchanger in an ice accumulative type cold water device constructed by a freezer, a super-cooling water heat exchanger and an ice storing tank by a method wherein the ice storing tank and the super-cooling cold water heat exchanger are connected by a cold water supplying passage and the cold water supplying passage is provided with an ice core melting part. SOLUTION: A freezer 1 is operated such that after pressure of refrigerant is reduced by an expansion valve 1a, cooled water supplied from an ice storing tank 3 passes between an outer pipe 2a and an inner pipe 2b of a heat exchanger 2, refrigerant supplied from the freezer 1 passes in the inner pipe 2b to cause the cooled water to be cooled to make super-cooled water, the super-cooled water is flowed into the ice storing tank 3 and iced there. In this case, a downstream side of a circulating water pump 7 inserted into and arranged at the cold water supplying passage 8 is provided with an ice core melting part 17. This ice core melting part 17 has an ice core melting filter 14, raw water of normal temperature is supplied from a raw water supplying passage 13 connected to an upstream side of this filter 14 to the cold water supplying passage 8, thereby ice core in the water passed through the ice separating filter 6 is melted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to production of supercooled water, and more particularly to prevention of freezing of a heat exchanger for supercooled water.

[0002]

2. Description of the Related Art Conventionally, there is an ice storage type cold water device for supplying cold water to an air conditioner, a food cooling device and the like. As shown in FIG. 4, this ice storage type cold water device communicates with an ice storage tank 31 and a supercooled water heat exchanger 32 (hereinafter, referred to as “heat exchanger 32”) by a circulation path 33. At the same time, the heat exchanger 32 and the refrigerator 34 are connected by a refrigerant circulation path 35. This ice storage type cold water storage device stores ice in the ice storage tank 31 by using late-night electric power, which has a low electricity rate, and is installed above the ice storage tank 31 in response to a load demand during operation of a food cooling device or the like. In addition to supplying the deicing water from, cold water is taken out from the lower part.

By the way, the operation of this ice storage type cold water device is as follows.
After the ice storage tank 31 is filled with water, the refrigerator 34 is activated to supply the cooling medium into the heat exchanger 32 for circulation, and at the same time, the cooled water in the ice storage tank 31 is sent to the heat exchanger 32. The heat-exchanged and supercooled water is stored in the ice storage tank 31.
Reflux into. When ice making starts in the ice storage tank 31, the temperature of the water to be cooled, which circulates and flows into the heat exchanger 32, lowers and freezing easily occurs in the heat exchanger 32, and particularly when the water temperature becomes 1 ° C. or less. It often freezes after a short period of operation. Therefore, conventionally, as a countermeasure thereof, the ice nuclei that have leaked and passed through the ice separation filter 36 provided in the ice storage tank 31 are extra finely meshed in the circulation path 33 between the ice storage tank 31 and the heat exchanger 32. A filter 37 is provided to make an effort to remove it, and an auxiliary heat exchanger (not shown) is provided to increase the water temperature at the inlet of the heat exchanger 32 to cope with the problem. In order to prevent freezing, the water temperature becomes high and the efficiency as an ice storage type cold water device is poor, which is not practical.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention mixes cold water from an ice storage tank with raw water at room temperature to remove ice nuclei flowing into a heat exchanger, and the temperature of the water is kept at a predetermined temperature. It is an object of the present invention to provide a freeze prevention system for an ice storage type cold water device which can be used as cooling water and can further melt the ice nuclei of the freezing factor and supply it to the heat exchanger.

[0005]

The present invention has been made to solve the above problems, and the invention of claim 1 is constituted by a refrigerator, a heat exchanger for supercooled water, and an ice storage tank. In the ice storage type cold water device described above, the ice storage tank and the supercooling water heat exchanger are connected by a cold water supply passage, and an ice nucleus melting portion is provided in the cold water supply passage, In the invention of Item 2, the ice nucleus melting portion comprises an ice nucleus melting filter provided in the cold water supply passage and a raw water supply passage connected to an upstream side of the ice nucleus melting filter. The invention according to claim 3 is characterized in that a flow rate control valve for controlling the flow rate of the raw water is provided.
In an ice storage type cold water device constituted by a heat exchanger for supercooled water and an ice storage tank, the ice storage tank and the heat exchanger for supercooled water are connected by a cold water supply passage, and a temperature is supplied to the cold water supply passage. A sensor is provided, and an ice nucleus melting filter is provided on the upstream side of this temperature sensor, and a raw water supply path is connected to the upstream side of this ice nucleus melting filter, and the raw water is supplied to this raw water supply path based on the signal from the temperature sensor. The invention according to claim 4 is characterized in that a flow rate control valve for controlling the flow rate of is stored in the ice storage type cold water device including a refrigerator, a heat exchanger for supercooled water and an ice storage tank. Connect the ice storage tank and the heat exchanger for supercooled water with a cold water supply path,
An ice nucleus melting filter is installed in this cold water supply channel,
Connect the raw water supply path to the upstream side of this ice nucleus melting filter,
The raw water supply passage is provided with a temperature sensor, and a flow rate adjusting valve for adjusting the flow rate of the raw water based on a signal from the temperature sensor is provided.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described. The present invention is a heat exchanger for supercooled water (hereinafter referred to as "heat exchanger") applied to an ice storage type cold water device.
The present invention relates to the antifreezing system, and is particularly effective for a heat exchanger having a double pipe structure composed of an outer pipe and an inner pipe. In the present invention, the object is achieved by removing ice nuclei mixed in the water to be cooled which flows into the heat exchanger. In a normal supercooled water ice making system,
When ice begins to form in the ice storage tank, the water to be cooled flowing into the heat exchanger often freezes in the heat exchanger even if the temperature thereof is about 1 ° C. The occurrence of this freezing
The temperature of the supercooled water near the inlet of the heat exchanger is not uniform, and there are locally many cold water masses close to 0 ° C., and ice nuclei therein flow into the heat exchanger. To do. In the present invention, from the cold water mass that surrounds the ice nuclei in the water to be cooled with variations in temperature,
The anti-freezing system is realized by the member that has the function of separating and melting the ice nuclei.

Specifically, the antifreezing system connects the heat exchanger and the ice storage tank with a cold water supply passage,
This is achieved by providing an ice nucleus melting portion in this cold water supply path, and more specifically, the ice nucleus melting portion is an ice nucleus melting filter formed by a fine mesh member and an upstream portion of this ice nucleus melting filter. The ice-nucleus melting filter here is configured to have the same temperature as the average temperature of the water to be cooled, which is a predetermined temperature due to the inflow of the raw water from the raw water supply passage. It is at temperature. Here, even though the average temperature is the predetermined temperature, in detail, the water temperature is not uniform, and many cold water bodies flowing from the ice storage tank are mixed and surrounded by the cold water bodies. The ice nuclei are captured by the ice nuclei melting filter. The trapped ice nuclei are warmed by the ice nuclei melting filter or mixed with a warm water mass passing therethrough and approach a predetermined temperature, so that the ice nuclei are completely melted and disappear. Since the ice nuclei flow into the heat exchanger in this state, the ice nuclei do not freeze even if supercooled there.

Further, in the present invention, the object is achieved by appropriately controlling the water to be cooled which flows into the heat exchanger and removing ice nuclei mixed in the water to be cooled. That is, the antifreezing system, specifically, the heat exchanger and the ice storage tank are connected by a cold water supply path, a temperature sensor is provided in the cold water supply path, and the cold water is provided upstream of the temperature sensor. A flow control valve that installs an ice nucleus melting filter in the supply path, connects the raw water supply path to the upstream position of the ice nucleus melting filter, and adjusts the flow rate of the raw water based on the signal from the temperature sensor in the raw water supply path. Is provided. In this configuration, first, the temperature of the water to be cooled in the cold water supply passage is detected, and when the detected temperature is lower than a predetermined temperature, the flow rate control valve is opened to supply raw water to the cold water supply passage. When the amount is increased and the detected temperature is higher than the predetermined temperature, the flow rate control valve is adjusted to reduce the supply amount of the raw water and the cooled water having the predetermined temperature is supplied to the heat exchanger. Therefore, the temperature of the cooled water flowing into the heat exchanger is set to a predetermined temperature (for example, 0.8
(° C ± 0.2 ° C), and let this flow into the heat exchanger.

Further, the present invention is realized as being applicable even in an area where the temperature of raw water varies greatly.
That is, the freeze prevention system is specifically configured to provide a temperature sensor in the raw water supply passage.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a first embodiment showing a configuration of an ice storage type cold water device embodying the present invention.

In FIG. 1, the ice storage type cold water device comprises a refrigerator 1, a heat exchanger for supercooled water (hereinafter referred to as "heat exchanger 2") and an ice storage tank 3. The refrigerator 1 is of a system in which, for example, a liquefied refrigerant (for example, freon) is decompressed by the expansion valve 1a, and then the water to be cooled is cooled through the heat exchanger 2 by latent heat of vaporization of the refrigerant. As shown in FIG. 1, the heat exchanger 2 has a double pipe structure in which an outer pipe 2a is formed in a spiral shape and an inner pipe 2b is inserted into the outer pipe 2a, and between the outer pipe 2a and the inner pipe 2b. The water to be cooled supplied from the ice storage tank 3 circulates in the inner pipe 2b, and the refrigerant supplied from the refrigerator 1 circulates in the inner pipe 2b. Therefore, the water to be cooled is cooled from the outer circumference of the inner pipe 2b to be supercooled water, and the supercooled water is caused to flow into the ice storage tank 3 and is frozen there.

The refrigerator 1 and the inner pipe 2b are connected by a refrigerant supply path 4 via an expansion valve 1a, and
They are connected by a refrigerant circulation path 5, and the refrigerant circulates between them. On the other hand, below the ice storage tank 3, a hemispherical ice separation filter 6 for preventing the outflow of ice.
The lower part of the ice separation filter 6 and the inlet of the outer pipe 2a are connected by a cold water supply passage 8 in which a circulating water pump 7 is inserted, and the outlet of the outer pipe 2a and the storage unit. The ice tank 3 is connected by a supercooled water return passage 9. Then, in the upper part of the ice storage tank 3, reflux water from a load side (not shown) or a water supply source (not shown)
To the load side, and a cold water outlet 11 to the load side is connected to the lower portion of the ice storage tank 3.

In the freeze prevention system of the present invention, an ice nucleus melting section 17 is provided on the downstream side of the circulating water pump 7 inserted in the cold water supply passage 8. The ice nucleus melting section 17 includes an ice nucleus melting filter 14 formed of a fine mesh member provided in the cold water supply passage 8, and raw water connected to the cold water supply passage 8 on the upstream side of the ice nucleus melting filter 14. Supply path 1
3. And this raw water supply channel 1
3 is provided with a flow rate control valve 12 that controls the flow rate of raw water.

According to the anti-freezing device of the present invention, after the water is filled to the predetermined low water level in the ice storage tank 3, the refrigerator 1 is driven to supply the refrigerant into the heat exchanger 2 for circulation. , The circulating water pump 7 is driven, the water in the ice storage tank 3 is supplied to the heat exchanger 2 via the cold water supply passage 8, and the supercooled water that has undergone heat exchange is stored from the supercooled water return passage 9 into the stored water. Reflux into the ice tank 3. Then, when ice making starts in the ice storage tank 3, the temperature of the water that circulates and returns to the heat exchanger 2 decreases, and when the temperature reaches a preset temperature, the raw water supply passage 1
3 operates the flow rate control valve 12 to supply an appropriate amount of normal temperature raw water to the cold water supply passage 8 through the raw water supply passage 13. As a result, the ice nucleus melting filter 14 captures and melts ice nuclei, if any, in the water that has passed through the ice separation filter 6 provided in the lower part of the ice storage tank 3. That is, the ice nuclei melting filter 14, which has substantially the same temperature as the water to be cooled which has reached a predetermined temperature, is surrounded by the cold water in the water to be cooled by the raw water at room temperature flowing from the raw water supply passage 13. The nuclei are captured and separated from the cold water mass, warmed by the ice nuclei melting filter 14, mixed with the warm water mass passing therethrough, and approach a predetermined temperature, so that the ice nuclei completely melt and disappear. . Therefore, there is no ice nucleus in the water to be cooled that has passed through the ice nucleus melting filter 14, and the water to be cooled is supplied to the heat exchanger 2 so that it does not freeze.

Next, a second embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted. In the embodiment shown in FIG. 2, a temperature sensor 15 is provided downstream of the ice nucleus melting filter 14 inserted in the cold water supply passage 8 described in the first embodiment, and this temperature sensor 15 is provided in the raw water supply passage 13. The flow rate control valve 12 is connected to the thin tube 16 (or, although not described and illustrated, it may be electrically connected by a signal line). The flow rate adjusting valve 12 is configured to adjust the opening through the thin tube 16 based on the detection value of the temperature sensor 15.

According to the freeze prevention system of the second embodiment,
When ice making starts in the ice storage tank 3, the temperature of the water to be cooled that circulates and returns to the heat exchanger 2 decreases, and when the temperature reaches a preset temperature, the temperature sensor 15 detects the temperature and the thin tube 16
The raw water at room temperature is supplied to the cold water supply passage 8 through the raw water supply passage 13 by operating the flow rate control valve 12 via the. As a result, the water to be cooled is adjusted to a predetermined temperature (for example, 0.8 ° C. ± 0.2 ° C.) at which it does not freeze in the heat exchanger 2 and flows into the heat exchanger 2.

Next, a third embodiment of the present invention will be described with reference to FIG. In the embodiment shown in FIG. 3, the temperature sensor 15 described in the second embodiment is provided in the raw water supply passage 13, and the temperature sensor 15 and the flow control valve 12 are provided in a thin tube 16.
And the opening degree of the flow rate control valve 12 is adjusted based on the detection value of the temperature sensor 15. In the third embodiment, in a region where the raw water temperature fluctuates a lot, the raw water supply amount is adjusted in accordance with the temperature change of the raw water flowing from the raw water supply passage 13.

[0018]

As described above, according to the present invention, the ice storage tank and the heat exchanger for supercooled water are connected by the cold water supply passage, and the ice nucleus melting portion is provided in the cold water supply passage. The ice nuclei flowing along with the water to be cooled can be captured and completely melted in the ice nucleus melting part. Therefore, freezing in the heat exchanger for supercooled water can be reliably prevented. Further, since the temperature sensor is provided in the cold water supply passage and the flow rate adjusting valve for adjusting the flow rate of the raw water based on the signal from the temperature sensor is provided, the temperature of the water to be cooled can be set to the predetermined temperature.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an ice storage type cold water device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of an ice storage type cold water device according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a configuration of an ice storage type cold water device of a third embodiment in which the present invention is implemented.

FIG. 4 is an explanatory diagram showing a configuration of a conventional ice storage type cold water device.

[Explanation of symbols]

 1 Refrigerator 2 Heat exchanger for supercooled water 3 Ice storage tank 8 Cold water supply channel 12 Flow control valve 13 Raw water supply channel 14 Ice nucleus melting filter 15 Temperature sensor 17 Ice nucleus melting part

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasutoshi Senoo 7, Horie-cho, Matsuyama-shi, Ehime Pref.

Claims (4)

[Claims] 1. An ice storage type chilled water device comprising a refrigerator 1, a heat exchanger 2 for supercooled water and an ice storage tank 3, wherein the ice storage tank 3 and the heat exchanger 2 for supercooled water are provided. An ice-freezing system for an ice storage type cold water device, characterized by being connected by a cold water supply path 8 and having an ice nucleus melting section 17 provided in this cold water supply path 8. 2. The ice nucleus melting section 17 comprises an ice nucleus melting filter 14 provided in the cold water supply passage 8 and a raw water supply passage 13 connected to the upstream side of the ice nucleus melting filter 14, and further The antifreezing system for the ice storage type cold water apparatus according to claim 1, wherein the raw water supply passage 13 is provided with a flow rate adjusting valve 12 for adjusting the flow rate of the raw water. 3. An ice storage type chilled water apparatus comprising a refrigerator 1, a heat exchanger 2 for supercooled water and an ice storage tank 3, wherein the ice storage tank 3 and the heat exchanger 2 for supercooled water are provided. The cold water supply passage 8 is connected, a temperature sensor 15 is provided in the cold water supply passage 8, an ice nucleus melting filter 14 is provided upstream of the temperature sensor 15, and the ice nucleus melting filter 1 is provided.
4, the raw water supply path 13 is connected to the upstream side, and the raw water supply path 13 is provided with a flow rate control valve 12 for adjusting the flow rate of the raw water based on the signal from the temperature sensor 15. Antifreeze system for cold water equipment. 4. An ice storage type chilled water device comprising a refrigerator 1, a heat exchanger 2 for supercooled water and an ice storage tank 3, wherein the ice storage tank 3 and the heat exchanger 2 for supercooled water are provided. The ice-nucleus melting filter 1 is connected to the cold-water supplying passage 8 and the ice-nucleus melting filter 14 is provided in the cold-water supplying passage 8.
4, the raw water supply path 13 was connected to the upstream side, the temperature sensor 15 was provided in the raw water supply path 13, and the flow rate control valve 12 for adjusting the flow rate of the raw water based on the signal from the temperature sensor 15 was provided. Freezing prevention system for ice storage type cold water equipment.