JPH10111062A - Low temperature cold water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously deliver cold water of about 0 deg.C, and eliminate the possibility of an apparatus from being damaged owing to freezing by detecting by detector partial freezing caused by cooling of water, and melting the partial freezing of a cooling line with freezing removal means. SOLUTION: A refrigerant line 2 and a cold water line 3 are disposed via a heat exchanger 1, and a detector 4 is provided for detecting partial freezing of the cold water line 3, and further freezing releasing means 5 is provided for releasing the partial freezing. For example, when set temperature of the heat exchanger 11 is set to about 0 deg.C, and then water is flowed to the cold water line 3, while circulating a refrigerant on the refrigerant line 2, the water is cooled through the heat exchanger 1 to obtain the water of about 0 deg.C. In this case, partial freezing happens in the course of the cold water line 3, and when a set flow rate is or lower reached, a signal from a flow rate sensor is sent. When the signal is received, the freezing releasing means 5 is actuated for melting the partial freezing in the cold water line 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates mainly to cooling, keeping low temperature in the food industry or other fields of physics and chemistry.
The present invention relates to a low-temperature water cooler used for quality control and the like.

[0002]

2. Description of the Related Art Conventionally, in a low-temperature chiller for continuously extracting chilled water near 0 ° C., a temperature sensor is installed at an outlet of a chilled water pump to detect the chilled water outlet temperature in order to prevent the chilled water from freezing. A method of stopping the refrigerator is used.

[0003]

However, considering the freezing and thawing characteristics of water based on FIG. 2, water freezes at 0 ° C., but after freezing starts and partial freezing starts, Until it is completely frozen, it requires latent heat and has a certain amount of time. Therefore, when the set value of the temperature sensor is set to about 0 ° C. at the outlet of the chilled water pump by the conventional method, it is not possible to accurately know the time when the freezing has started, and the freezing has been completely caused to damage the piping and the like. About 2 ° C to ensure that the temperature sensor is activated to prevent freezing.
The temperature cannot be set below, and with a conventional water cooler, cold water of about 2 ° C. or less could not be obtained. In addition, even if the operating value of the protection device is set to 2 ° C., at present, only cold water having a temperature higher by 1 to 2 ° C. than the operating value can be taken out.

Accordingly, an object of the present invention is to provide a low-temperature chiller that can continuously take out cold water at about 0 ° C. and that is not likely to be damaged by freezing.

[0005]

The inventor of the present invention has conducted intensive studies to solve the above-mentioned problems, and as a result, a low-temperature chiller for supplying chilled water, which detects and controls partial freezing caused by cooling of water. Developing a low-temperature chiller characterized by making it possible to supply chilled water at about 0 ° C., and to provide the present invention.

[0006] More specifically, it is composed of a refrigerant line having a refrigerator and a chilled water line for supplying chilled water via a heat exchanger. By detecting the partial freezing that occurs with the detector and melting the partial freezing of the chilled water line with the freeze releasing means,
It is characterized in that cold water at about 0 ° C. can be supplied.

Furthermore, it is preferable to use a flow sensor as the detector.

Further, it is desirable to use a technique for stopping the operation of the refrigerator for a certain period of time as the freeze releasing means.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the low-temperature water cooler of the present invention will be described.

The details of the invention are further explained by means of the illustrated embodiment. As shown in FIG. 1, the low-temperature chiller A is provided with a refrigerant line 2 and a chilled water line 3 via a heat exchanger 1 and a detector 4 for detecting partial freezing of the chilled water line 3. , A freeze releasing means 5 for releasing the partial freezing.

As shown in FIG. 1, the chilled water line 3 includes a chilled water circulating pump 6, a water strainer 7, a detector 4 using a flow sensor, and a chilled water temperature sensor 8 at the inlet side of the heat exchanger 1. The pipe 9 is connected to the outlet 9 of the heat exchanger 1. In addition, cold water line 3
As the detector 4 for detecting partial freezing, a flow rate sensor is practical and preferable, for example,
It is also possible to provide an operation piece for detecting the flow of water in the cold water line 3 and detect an external force acting on the operation piece to confirm that partial freezing has occurred.

As shown in FIG. 1, the refrigerant line 2 includes a throttle mechanism 10, a refrigerant liquid solenoid valve 11, a liquid dryer strainer 12,
A refrigerator 13 and a refrigerant gas strainer 14 are connected by a pipe 9 from the outlet of the heat exchanger 1 to the inlet. Example refrigerator
13 is a refrigerant liquid check valve 15, a liquid receiver 16, a condenser 17, a compressor 1
8. It is composed of a high / low pressure switch 19, an accumulator 20, and a refrigerant gas check valve 21.

Although the heat exchanger 1 uses a plate heat exchanger having a plurality of flow paths, other heat exchangers can be used.

The freeze releasing means 5 is a means for removing the partially frozen chilled water line 3 from its original state, that is, the partial freezing. As a specific means, by heating the cold water line 3 using an electric heater or hot gas,
Partial freezing of the cold water line 3 can be thawed. Further, by stopping the refrigerator 13 in the refrigerant line 2 until the partial freezing of the chilled water line 3 is melted, or by reducing the flow rate of the chilled water line 3 by the throttle mechanism 10, or by raising the evaporation temperature, Partial freezing of the cold water line 3 can be thawed.

According to the low-temperature water chiller A of this embodiment, for example, after setting the temperature of the heat exchanger 1 to about 0 ° C., the refrigerant in the refrigerant line 2 is circulated from the inlet to the outlet in the chilled water line 3. When the water flows, the water is cooled in the heat exchanger 1 to obtain cold water of about 0 ° C. If partial freezing occurs in the middle of the chilled water line 3, it becomes difficult for water to flow, and when the flow rate becomes equal to or less than the set flow rate, a signal is transmitted from the flow rate sensor. In response to this signal, the freeze releasing means 5 for thawing the partial freezing in the chilled water line 3 operates. For example, as the freeze releasing means 5, the chilled water line 3 is heated by using an electric heater or hot gas, or the refrigerator 13 in the refrigerant line 2 is stopped, or a throttle mechanism is provided.
By reducing the flow rate of the chilled water line 3 at 10 or raising the evaporation temperature, the chilled water line 3 and the heat exchanger 1
Part of the freeze is thawed. When the partial freezing is thawed and a flow rate equal to or higher than the set flow rate is detected, the flow rate sensor transmits a signal, and upon receiving this signal, the low-temperature water chiller A operates to reduce the temperature of the supplied water to about 0 ° C. Can be held.

As described above, according to the low-temperature chiller A of the present embodiment,
The temperature of the chilled water to be supplied is set to about 0 ° C., but since the flow rate sensor for detecting the flow rate of the chilled water line 3 is used as the detector 4, the partial freezing in the chilled water line 3 is started by the flow rate sensor Is reliably detected, the freezing release means 5 melts the partial freezing of the cold water line 3, and the temperature of the cold water can be maintained at about 0 ° C. without freezing of the cold water line 3.

Moreover, since the plate type heat exchanger is used for the heat exchanger 1, even if partial freezing occurs, since it has a plurality of flow paths, there is no possibility of breakage and the strength is excellent. It will be.

Further, by using a method of stopping the operation of the refrigerator 13 for a certain period of time as the connection releasing means 5, the ice is partially cooled by the heat of melting of the ice which has been partially frozen in the chilled water line 3, and after the operation of the refrigerator 13 is stopped. Also, it is possible to continuously feed cold water.

The low-temperature chiller A of this embodiment is used for:
It can be used for cooling the brewing water, adjusting the temperature of low-temperature fermentation of moromi, adjusting the temperature of the sake brewer, and keeping the stored sake at a low temperature. In addition, cooling of kneading liquid in noodle making, confectionery, and bread making, or cooling of soybean immersion water in tofu, cooling during storage of products, and other services, such as supplying cold water to restaurants and cafeterias, and welfare at factories and workplaces Can be used. Also,
The low-temperature water cooler A of the present embodiment can be used in the field of physics and chemistry.

[0020]

As apparent from the above description, the following operations and effects are obtained. According to the low-temperature water chiller according to claim 1, 2, or 4, for example, after setting the set temperature of the heat exchanger to about 0 ° C, the refrigerant in the refrigerant line is circulated while the refrigerant is circulated from the inlet to the outlet. When you pour water
The water is cooled in the heat exchanger to obtain cold water at about 0 ° C.
Then, if partial freezing occurs in the middle of the chilled water line, it becomes difficult for water to flow, and when the flow rate falls below the set flow rate, a signal is transmitted from the flow rate sensor. In response to this signal, the freeze releasing means for thawing the partial freezing of the chilled water line is activated.
For example, as a freeze releasing means, the refrigerator in the refrigerant line is stopped for a certain period of time, so that the chilled water line and the heat exchanger can be partially frozen. In this way, the partial freeze is thawed, the detector sends a signal, and in response to this signal, the low-temperature water chiller is operated, and the temperature of the supplied water can be maintained at about 0 ° C.

According to the low-temperature chiller of claim 3, the temperature of the chilled water to be supplied is set to about 0 ° C. However, since the flow rate sensor for detecting the flow rate of the chilled water line is used as a detector, the flow rate sensor is It is necessary to maintain the temperature of the chilled water at about 0 ° C without freezing the chilled water line so that the time when the partial freezing is started in the chilled water line is surely detected and the thawing release means thaws the partially frozen chilled water line. Can be.

According to the low-temperature chiller of the fourth aspect, the method of stopping the operation of the refrigerator for a fixed period is used as the freeze releasing means. Even after stopping, cold water can be continuously delivered.

[Brief description of the drawings]

FIG. 1 is a flow sheet diagram of a low-temperature chiller of a representative embodiment according to the present invention.

FIG. 2 is a characteristic diagram showing freezing and thawing of water.

[Explanation of symbols]

A low-temperature chiller 1 heat exchanger 2 refrigerant line 3 chilled water line 4 detector 5 defrosting means 6 chilled water circulation pump 7 water strainer 8 chilled water temperature sensor 9 piping 10 throttle mechanism 11 refrigerant liquid solenoid valve 12 liquid dryer strainer 13 refrigerator 14 Refrigerant gas strainer 15 Refrigerant liquid check valve 16 Receptacle 17 Condenser 18 Compressor 19 High / low pressure open / close valve 20 Accumulator 21 Refrigerant gas check valve

Claims (4)

[Claims] 1. A low-temperature chiller for supplying chilled water, wherein chilled water at about 0 ° C. can be supplied by detecting and controlling partial freezing caused by cooling of water. Water cooler. 2. A refrigerant line having a refrigerator and a chilled water line for supplying chilled water via a heat exchanger. A detector is installed in the middle of the chilled water line to prevent partial freezing caused by cooling of the water. A low-temperature water cooler characterized in that it is possible to supply cold water at about 0 ° C. by detecting with a detector and partially freezing the cold water line with a freeze releasing means. 3. The low-temperature water chiller according to claim 2, wherein a flow rate sensor is used as the detector. 4. The low-temperature chiller according to claim 2, wherein a method of stopping the operation of the refrigerator for a certain period is used as the freeze releasing means.