JPH0160743B2 - - Google Patents

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention relates to a heat pump water heater, and in particular, it is capable of improving the initial capacity of heat pump water supply, recovering exhaust heat from a compressor, and effectively cooling lubricating oil of the compressor. and new improvements.

b. Prior Art Generally, when heat pump hot water supply is performed, the lubricating oil is cooled immediately after the compressor is started, and a large amount of refrigerant is dissolved in the compressor, resulting in a decrease in capacity due to a lack of refrigerant. Furthermore, during continuous operation, the heat generated by the compressor deteriorates the lubricating oil inside the compressor, resulting in damage due to poor lubrication, so cooling measures must be taken, and conventional configurations In this case, the lubricating oil was cooled by introducing high-pressure liquid refrigerant into the oil cooler from a part of the condenser, or by blowing air from a cooling fan.

c Problems to be solved by the present invention In the conventional configuration described above, when hot water is supplied at a high temperature, it is necessary to increase the condensing pressure and the condensing temperature, but increasing the condensing temperature reduces the load on the compressor. In cooling with the high-pressure liquid refrigerant, sufficient cooling is not achieved due to the high temperature of the liquid refrigerant.
This caused damage to the compressor. Further, in a configuration in which the compressor is cooled by blowing air from a fan or the like,
The heat generated by the compressor was supposed to be discarded as surplus heat, which went against energy conservation.

d Means for Solving the Problems The present invention aims to provide extremely effective means for quickly eliminating the above-mentioned drawbacks, and its gist is to a compressor having a cooler, a hot water supply heat exchanger connected to the compressor, an expansion device connected to the hot water supply heat exchanger, and a heat source side heat connected to the expansion device and the compressor. an exchanger, a water pipe connecting the oil cooler and the hot water supply heat exchanger, a water pipe connecting the oil cooler and a water pipe via a flow rate adjustment valve, and a water pipe provided in a route of the water pipe. a three-way valve, a bypass pipe for connecting the water supply pipe and the three-way valve, an oil temperature detector for detecting the oil temperature in the shell, and a pressure sensor for detecting the discharge pressure of the compressor. This is a heat pump water heater equipped with a water heater.

e Effect The flow rate of water supplied from the water pipe is adjusted by the flow rate regulating valve, and if the temperature of the oil in the shell is below the set value, it is bypassed through the bypass pipe, and if it is above the set value, the water is It passes through an oil cooler for heat exchange. Furthermore, the hot water is heat exchanged with a high-temperature, high-pressure refrigerant gas in the hot water supply heat exchanger, and the hot water is supplied from the hot water supply pipe to a hot water storage tank or an external supply port.

f. Embodiments Hereinafter, preferred embodiments of the heat pump water heater according to the present invention will be described in detail with reference to the drawings.

In the drawings, the reference numeral 1 indicates a compressor for compressing and supplying refrigerant. It is connected to the entrance side 2a. In the hot water supply heat exchanger 2, a refrigerant guide pipe 2b and a water guide pipe 2c are arranged in parallel and connected to each other, and the first outlet side 2d of the refrigerant guide pipe 2b is connected to the second connection. It is connected to an expansion device 3 via means 2e, and this expansion device 3 is connected to the inlet side 4a of the heat source side heat exchanger 4 via a third connection means 3a. The outlet side 4b of this heat source side heat exchanger 4 is connected to the inlet side 1c of the compressor 1 via a fourth connecting means 4c.

A pipe-shaped oil cooler 5 is provided in the shell 1d of the compressor 1, and a water supply pipe 10 of a flow rate regulating valve 8 connected to a water pipe 7 is connected to the inlet side 5a of the oil cooler 5. is connected, and the outlet side 5b of the oil cooler 5 is connected to a three-way valve 9.
The hot water supply heat exchanger 2 is connected to the water supply pipe 5c via the water pipe 5c.
is connected to the inlet side 2f of the water guide pipe 2c, and the outlet side 2g of the water guide pipe 2c is connected to the hot water storage tank 15 via the hot water supply pipe 11. Further, a bypass pipe 12 provided midway in the water supply pipe 10 is connected to the three-way valve 9 provided midway in the water distribution pipe 5c, forming a bypass circuit.

The hot water storage tank 15 is provided with a full water detection level switch 16 and a hot water supply start detection level switch 17, as well as a hot water supply port 13.

The flow rate adjustment valve 8 is configured to detect the discharge pressure of the compressor 1, and adjust the opening degree of the flow rate adjustment valve 8 based on the detected pressure to control the flow rate.

In the above configuration, when the heat pump water heater according to the present invention is operated, when the power is turned on, the compressor 1 is driven and performs a suction compression action, so that the high-temperature and high-pressure refrigerant gas is transferred to the first connection. It flows through the means 1b into the refrigerant guide pipe 2b of the hot water supply heat exchanger 2 in the direction of arrow A, exchanges heat with the water in the water guide pipe 2c, and is condensed and liquefied. This liquefied refrigerant liquid passes through the second connecting means 2e, the expansion device 3, and the third connecting means 3a, and flows into the heat source side heat exchanger 4 as a low-temperature, low-pressure gas. The low-temperature, low-pressure refrigerant gas that has flowed into the heat source side heat exchanger 4 absorbs heat from air or water, evaporates, and enters the compressor 1 through the fourth connecting means 4c, as shown by arrow A. It is inhaled and compressed again.

However, immediately after starting the compressor 1, the lubricating oil is cold and a large amount of refrigerant has dissolved in the lubricating oil, resulting in a shortage of refrigerant in the refrigeration cycle and a decrease in capacity. Since the refrigerant in the lubricating oil is removed faster if it is not cooled,
If the initial capacity is good, and further cooling when the lubricating oil is at a low temperature will increase the viscosity of the lubricating oil, causing poor lubrication and increased sliding resistance, the input will increase. If the lubricating oil temperature is equal to or higher than the set value via the flow rate adjustment valve 8 and the water supply pipe 10, the hot water supply water is supplied to the oil cooler 5 and heated by exchanging heat with the lubricating oil in the compressor 1. The lubricating oil is cooled as the lubricating oil is cooled. Furthermore, if the lubricating oil temperature is below the set value, the lubricating oil is supplied to the bypass pipe 12.

The hot water supply water heated by the oil cooler 5 or supplied to the bypass pipe 12 is
The high temperature refrigerant flows into the water guide pipe 2c of the hot water supply heat exchanger 2 in the direction of arrow B through the water distribution pipe 5c, and flows in opposite directions to the high temperature refrigerant that is continuously flowing into the refrigerant guide pipe 2b. The hot water is heated through the hot water supply pipe 11 and heat exchanged with the hot water storage tank 15 through the hot water supply pipe 11.
Hot water is stored inside. In this case, the hot water tank 15
It is also possible to supply hot water directly to other places or equipment without installing a water supply system.

The temperature of hot water supplied from the hot water supply pipe 11 is approximately proportional to the discharge pressure of the compressor 1, and is therefore controlled by the discharge pressure. or,
When the amount of hot water stored in the hot water storage tank 15 reaches the position of the full water detection level switch 16, the operation of the compressor 1 is stopped and the hot water supply operation is stopped. Further, when hot water is supplied from the hot water supply port 13 and the amount of hot water stored in the hot water supply tank 15 decreases to the operating position of the hot water supply start detection level switch 17, the compressor 1 starts operating by a control circuit (not shown).

g Effects of the Invention Since the present invention has the above-described configuration and operation, the oil cooler in the compressor exchanges heat and heats the hot water before supplying it to the heat exchanger for hot water supply. Heat can be effectively used for hot water supply, and by cooling the lubricating oil of the compressor with water, the cooling effect can be increased, and the life of the compressor can be greatly extended. Furthermore, at startup,
Since hot water supply water is bypassed from the oil cooler, it is possible to achieve effects such as improving the initial hot water supply performance characteristics.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall structure of a heat pump water heater according to the present invention. 1 is a compressor, 2 is a heat exchanger for hot water supply, 2b is a refrigerant guide pipe, 2c is a water guide pipe, 3 is an expansion device, 4 is a heat source side heat exchanger, 5 is an oil cooler, 6 is a pressure detector, 7 is a water pipe, 8 is a temperature type flow rate adjustment valve, 10 is a water supply pipe, 11 is a hot water supply pipe, 12 is a bypass pipe, 1
5 is a hot water tank.

Claims (1)

[Claims] 1 A compressor 1 having an oil cooler 5 in a shell 1d, a hot water supply heat exchanger 2 connected to the compressor 1, an expansion device 3 connected to the hot water supply heat exchanger 2, and the expansion device 3, a heat source side heat exchanger 4 connected to the compressor 1, and a water pipe 5 connecting the oil cooler 5 and the hot water supply heat exchanger 2.
c, a water supply pipe 10 that connects the water pipe 7 to the oil cooler 5 via the flow rate adjustment valve 8, a three-way valve 9 provided in the route of the water pipe 5c, and the water supply pipe 10 and the three-way valve 9. a bypass pipe 12 for connecting the hot water supply, an oil temperature detector 14 for detecting the oil temperature in the shell 1d, and a pressure detector 6 for detecting the discharge pressure of the compressor 1; A heat pump type hot water supply device characterized in that hot water is supplied from a heat exchanger 2 through a hot water supply pipe 11.