JP3674974B2 - Water cooler - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a chilled water device, and more particularly to a chilled water device having a cooling function.
[0002]
[Prior art]
With reference to FIG. 2, the basic structure of the cold water apparatus 1 is shown. A refrigerant circuit for cold water in which a CFC substitute medium is sealed has a configuration in which a compressor 2, an outdoor heat exchanger 3 as a condenser, an expansion valve 4, a cold water tank 5 as an evaporator, and an accumulator 9 are connected in series. The cold water in the cold water tank is used to cool buckwheat and tofu or to cool restaurant food.
The cycle of the chilled water device 1 will be described. A high-temperature and high-pressure gas (CFC substitute medium) from the compressor 2 enters an outdoor heat exchanger 3 serving as a condenser, where it condenses while dissipating heat at a high-temperature and high-pressure. It becomes a liquid phase. This liquid phase is then expanded by the expansion valve 4 to form a low-temperature and low-pressure gas-liquid two phase, and enters a cold water tank 5 as an evaporator. The cold water tank 5 is composed of a water storage part for receiving tap water and a pipe part for passing a gas-liquid two-phase medium, and the gas-liquid two-phase medium in the pipe part takes away the heat of the water in the water storage part and evaporates. It enters the accumulator 9 as a low-pressure gas (including a part of the liquid phase). The gas and liquid are separated in the accumulator 9 and only the gas phase is sucked into the compressor 2.
[0003]
The water in the cold water tank 5 absorbs heat for the vaporization of the gas-liquid two-phase medium, lowers the water temperature, becomes cold water, and is used, for example, for washing the buckwheat. While the water in the cold water tank 5 is supplied to the outside and new relatively high temperature water is being fed into the cold water tank 5, that is, during a load in which the water circulates, no icing is observed, but if the load becomes very small In other words, when there is no circulation of water, freezing occurs. Aside from the intentional extraction and use of this icing, icing is undesirable because the gas-liquid two-phase medium in the pipe section makes it difficult to absorb heat from water and creates a liquid back state.
[0004]
[Problems to be solved by the invention]
As described above, the present invention has a problem to be solved by utilizing the liquid back state due to the difficulty of heat absorption into the gas-liquid two-phase medium in the cold water tank and efficiently using the cold water device. To do.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, an object of the present invention is to provide an accumulator and a refrigerant pump between a chilled water tank and a compressor in a chilled water apparatus in which a chilled water tank as a compressor, a condenser, and an evaporator is connected to a refrigerant circuit. A first accumulator connected to the cold water tank and the refrigerant pump, and a second accumulator connected to the indoor heat exchanger. Then, a cold water device is provided in which the first accumulator is connected to the compressor via the switching valve and the second accumulator is connected via the check valve .
[0006]
Preferably, the accumulator includes a first accumulator connected to the cold water tank and the refrigerant pump, and a second accumulator connected to the indoor heat exchanger, and the first accumulator is connected to the first accumulator via the switching valve and Two accumulators are connected to the compressor via a check valve.
[0007]
[Action]
In the time zone when cold water is not used, the liquid phase in the accumulator is sent to the indoor heat exchanger by the refrigerant pump and evaporated to cool the room. Of course, depending on the degree of ice storage in the cold water tank, cold water supply and cold air supply can be made possible simultaneously.
[0008]
【Example】
Since the example of the present invention shown in FIG. 1 includes the refrigerant circuit of the conventional example shown in FIG. 2, the same components as those in FIG.
The liquid phase component of the accumulator 6 is connected to an indoor heat exchanger 8 as an evaporator via a refrigerant pump 7, and this indoor heat exchanger 8 is connected to the compressor 2 via a second accumulator 9. To do. The first accumulator 6 is connected to the compressor 2 via a switching valve 10 and the second accumulator 9 is connected to the compressor 2 via a check valve 11.
[0009]
At the time of normal cold water supply, the switching valve 10 is opened and the refrigerant pump 7 is turned off, the gas-liquid two-phase refrigerant from the cold water tank 5 enters the accumulator 6, and the gas phase is sucked into the compressor 2. . When the cold water supply is stopped, the switching valve 10 is closed, the refrigerant pump 7 is turned on, the gas-liquid two-phase refrigerant from the cold water tank 5 is put into the accumulator 6, and the indoor heat exchange is performed on the liquid phase by the refrigerant pump 7. The liquid phase refrigerant is evaporated and the room is cooled. The evaporated refrigerant enters the second accumulator 9, and the gas phase is sucked into the compressor 2, recompressed, and discharged from the compressor 2 as high-temperature and high-pressure gas.
[0010]
Depending on the ice storage or icing state in the cold water tank 5, cold water supply and cold air supply are possible.
[0011]
When a mixed medium consisting of three components, that is, a refrigerant consisting of 23 to 30 wt% R-32, 10 to 25 wt% R-125, and 52 to 60 wt% R-134a is used as the refrigerant, R-134a having a high boiling point is liquefied. Therefore, a large amount of a liquid phase having a high component ratio of R-134a is formed in the first accumulator 6, and the cooling time can be maintained long.
[0012]
【effect】
A store that uses a chilled water device can be used effectively because the indoor cooling can be obtained when the chilled water is not used only by installing an indoor heat exchanger, a refrigerant pump, and an accumulator.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an example of the present invention.
FIG. 2 is an explanatory diagram of a conventional cold water apparatus.
[Explanation of symbols]
2 Compressor 3 Condenser 4 Expansion valve 5 Cold water tank (evaporator)
6, 9 Accumulator 7 Refrigerant pump 8 Indoor heat exchanger

Claims (1)

In a chilled water device in which at least a chilled water tank as a compressor, a condenser, and an evaporator is connected to a refrigerant circuit, an accumulator, a refrigerant pump, and an indoor heat exchanger as an evaporator are provided between the chilled water tank and the compressor. A first accumulator connected to the cold water tank and the refrigerant pump, and a second accumulator connected to the indoor heat exchanger, wherein the first accumulator is connected to the first accumulator via the switching valve. A chilled water device in which the accumulator of 2 is connected to the compressor via a check valve .

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