JPS6113545B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a water heater that utilizes condensation heat from a refrigeration system.

Conventional technology Conventionally, in order to provide a hot water supply system using the condensation heat of a refrigeration system, the condenser is divided into multiple parts, each of which is connected in series with the refrigerant flow, and the fluid to be heated is heated in each condenser. A method is proposed.

Problems to be Solved by the Invention However, since such a refrigeration system uses a single refrigerant, it is difficult to obtain a high-temperature fluid in order to obtain the cooling performance required by this refrigeration system.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a water heater that obtains high-temperature fluid while maintaining the cooling performance of the cooling device.

Means for Solving the Problems In view of the above problems, the present invention provides a medium temperature hot water storage tank, a high temperature hot water storage tank, a first heat exchanger provided in the high temperature hot water storage tank, and a second heat exchanger provided in the medium temperature hot water storage tank. a heat exchanger;
It consists of a compressor with a refrigerant injection device, a gas-liquid separator, a main condenser, a throttling device, an evaporator, and a flow restrictor, the compressor, the first heat exchanger, the gas-liquid separator,
A second heat exchanger, a main condenser, a throttling device, and an evaporator are sequentially connected to the closed cycle, and a pipe is provided to lead the liquid refrigerant from the air flow separator to the refrigerant injection device of the compressor via a flow restrictor. In addition, a plurality of refrigerants having different saturation temperatures are used as refrigerants.

Effect: With the above configuration, the refrigerant with a high saturation temperature is returned to the compressor from the gas-liquid separator via the flow restrictor, and the refrigerant with a low saturation temperature is allowed to flow into the evaporator.

Example 1 is a compressor with a refrigerant injection type cooling device (hereinafter referred to as a compressor) that cools the compressor by injecting condensed refrigerant into the cylinder, and the discharged mixed refrigerant is stored in a high temperature hot water storage tank 2. The refrigerant flows into the first heat exchanger 3 and exchanges heat with hot water, where only the refrigerant with a high saturation temperature is condensed and liquefied. The mixture with the gaseous refrigerant then flows into the gas-liquid separator 4 and is separated into gas and liquid. The refrigerant with a high saturation temperature stored at the bottom of the gas-liquid separator 4 flows into the cylinder (not shown) of the compressor 1 through the flow restrictor 5 and evaporates to cool the compressor 1. The refrigerant remaining in the gaseous mixed refrigerant in the gas-liquid separator 4 flows into the second heat exchanger 7 provided in the medium-temperature hot water storage tank 6, where it exchanges heat with the medium-temperature hot water and is brought into a state close to saturated steam. Become. Thereafter, the refrigerant flows to the main condenser 8, throttle device 9, evaporator 10, and compressor 1, forming a normal refrigeration system.

Next, the hot water supply system will be explained. Medium temperature hot water tank 6
A float valve 11 is provided at the upper part of the tank, and its inlet end opens to a water source and its outlet end opens into the medium-temperature hot water storage tank 6, so that water is supplied as appropriate depending on the water level. In addition, at the bottom, a faucet 12 for medium-temperature hot water used for washrooms, etc., and a connecting pipe 13 communicating with the high-temperature hot water tank 2 are provided, and preheated medium-temperature water is sent to the high-temperature hot water tank 2 to generate high-temperature hot water. It's easy. At the bottom of the high-temperature hot water storage tank 2, there is a faucet 1 for hot water used for hot water, etc.
4 is provided to constitute a water supply system path.

Note that the hot water storage tanks 2 and 6 are generally kept warm by a heat insulating material, but illustration thereof is omitted since this is not the gist of the present invention. Furthermore, although the present embodiment has described hot water supply, it goes without saying that it is possible to connect terminal equipment such as a heating device to each of the hot water storage tanks 2 and 6. Furthermore, the gist of the present invention can also be applied to a heat pump type air conditioner.

In this way, a refrigeration system is filled with a plurality of mixed refrigerants with different saturation temperatures, and the first heat exchanger 3 is installed on the outlet side of the compressor 1 to generate and maintain high-temperature hot water, and here the first heat exchanger 3 is mainly used for high-temperature heating. A refrigerant with a high saturation temperature that matches the function is condensed and liquefied, a large amount of hot water is generated and maintained, the condensed and liquefied refrigerant with a high saturation temperature is separated by a gas-liquid separator 4, and the condensed liquid is passed through a flow restrictor 5.
The residue of the mixed refrigerant, which becomes gaseous in the gas-liquid separator 4, is a refrigerant with a low saturation temperature that matches the refrigeration action of the refrigeration system. However, since it is circulated to the refrigeration system via the second heat exchanger 7 that generates and maintains medium-temperature hot water, a large amount of high-temperature hot water is generated and maintained, and the evaporation pressure of the evaporator 10 increases the evaporation temperature. Refrigerant with a high saturation temperature, which passes through the evaporator 10 as a liquid, inhibits the evaporation action and impedes the refrigeration effect, is used to cool the compressor 1, improves the suction efficiency of the compressor 1, and saves refrigerating machine oil and electricity. By preventing deterioration of the insulator, a longer life can be achieved. Furthermore, since only the refrigerant with a low saturation temperature that matches the refrigeration effect is flowed into the main refrigeration system, there is no reduction in the refrigeration effect.

In addition, in this hot water supply system, among the mixed refrigerants used in the refrigeration system, the first refrigerant is Freon-22, which matches the refrigeration action that is the main purpose of the refrigeration system and has a relatively low saturation temperature relative to the discharge pressure. do. Further, as the second refrigerant, Freon-C318, which has a high saturation temperature relative to the discharge pressure, is used in order to meet the high-temperature heating effect that is the main purpose of the water heater. The mixing ratio of the first and second refrigerants is determined by the temperature and amount of hot water required.

Effects of the Invention As described above, in the present invention, high-temperature hot water can be obtained using a refrigerant with a high saturation temperature, medium-temperature hot water can be obtained using a refrigerant with a low saturation temperature, and a sufficient refrigeration effect can be obtained using both of these refrigerants. The gas-liquid separator has various advantages, such as improving the suction efficiency of the compressor and preventing deterioration of refrigerating machine oil and electrical insulators, thereby extending the life of the compressor.

[Brief explanation of the drawing]

The figure is a piping circuit diagram of a water heater according to an embodiment of the present invention. 1... Compressor, 2... High temperature hot water storage tank, 3... First heat exchanger, 4... Gas-liquid separator, 5... Flow rate restrictor, 6... Medium temperature hot water storage tank, 7... Second heat exchanger, 8
...Main condenser, 9... Throttle device, 10... Evaporator.

Claims (1)

[Claims] 1. A medium temperature hot water storage tank, a high temperature hot water storage tank, a first heat exchanger provided in the high temperature hot water storage tank, a second heat exchanger provided in the medium temperature hot water storage tank, and a compressor with a refrigerant injection device,
Consisting of a gas-liquid separator, a main condenser, a throttle device, an evaporator, and a flow restrictor, the compressor, a first heat exchanger, a gas-liquid separator, a second heat exchanger, and a main condenser. ,
The piping is connected to the throttling device and the evaporator in a closed cycle, and the liquid refrigerant from the air flow separator is connected to the refrigerant injection device of the compressor via the flow restrictor. A water heater that utilizes waste heat and is constructed using a refrigerant.