JP5176485B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump water heater used for hot water supply, heating, drying and the like.

  Conventionally, this type of heat pump hot water supply apparatus is composed of a refrigerant circuit composed of a compressor, a radiator, a throttle means, and an evaporator, and a hot water supply circuit composed of a radiator, a circulation pump, and a hot water tank. The hot water was carried to a hot water tank and stored as heat, and hot water taken out of the hot water tank and the water supply were mixed with a mixing valve at a predetermined temperature to provide a heat load such as hot water supply (for example, patent documents) 1).

FIG. 6 shows a conventional heat pump hot water supply apparatus described in Patent Document 1. As shown in FIG. As shown in FIG. 6, the compressor 1, the radiator 2, the throttle means 3, the evaporator 4, the circulation pump 5, the hot water tank 6, and the mixing valve 7 are included.
JP 2003-247759 A

  However, in the conventional configuration, the temperature in the hot water tank rises in order from the top during the heat storage operation, so the temperature of the circulating water sent to the radiator by the circulation pump also rises with time and exits the heat pump refrigerant circuit radiator. As a result, the temperature of the refrigerant was raised, and there were problems such as reducing the efficiency of heat pump operation.

  This invention solves the said conventional subject, and it aims at providing a highly efficient heat pump hot-water supply apparatus.

In order to solve the conventional problem, a heat pump hot water supply apparatus of the present invention includes a heat pump refrigerant circuit formed by sequentially connecting a compressor, a radiator, a throttle means, and an evaporator, and the radiator and the throttle means. A first bypass circuit that bypasses a pipe to be connected; a hot water supply circuit that is connected to the radiator and has a hot water storage tank that stores hot water heated by the radiator; and a connecting pipe that connects the compressor and the radiator a second bypass circuit which bypasses the heat accumulator that connects the second bypass circuit and said first bypass circuit, a first circuit switching means provided in the first bypass circuit, provided in the second bypass circuit comprising a second circuit switching means, and the inlet temperature sensing means of said radiator and an outlet temperature sensing means of said radiator, based on the detected value of the inlet temperature sensing means and said outlet temperature detecting means The present invention in which the first circuit switching means, characterized in that the arrangement for controlling the second circuit switching means, when the refrigerant temperature at the outlet of the radiator of the heat pump refrigerant circuit is increased, the first bypass circuit The efficiency of the heat pump operation can be improved by flowing the refrigerant through the heat accumulator and releasing the heat to the heat accumulator to lower the refrigerant temperature. Further, the heat stored in the heat accumulator By recovering heat from the heat accumulator in the bypass circuit and increasing the temperature of the refrigerant entering the radiator, the high temperature refrigerant can be supplied before the compressor temperature rises, improving the starting characteristics, Ru can improve system efficiency of the entire device.

  ADVANTAGE OF THE INVENTION According to this invention, the heat pump hot water supply apparatus which can improve heat pump operation efficiency and a starting characteristic can be provided.

The first invention includes a heat pump refrigerant circuit formed by sequentially connecting a compressor, a radiator, a throttle means, and an evaporator, a first bypass circuit that bypasses a pipe connecting the radiator and the throttle means, A hot water supply circuit having a hot water tank connected to the radiator and storing hot water heated by the radiator, a second bypass circuit bypassing a connection pipe between the compressor and the radiator, and the first bypass a heat accumulator that connects the a circuit second bypass circuit, said a first circuit switching means provided in the first bypass circuit, a second circuit switching means provided in the second bypass circuit, the inlet of the radiator a temperature detecting means, and an outlet temperature detection means of the radiator, wherein the inlet temperature sensing means based on the detected value of the outlet temperature detecting means, wherein the first circuit switching means a second circuit switched Characterized in that it has a structure for controlling the stage, when the refrigerant temperature at the outlet of the radiator of the heat pump refrigerant circuit rises, releasing heat to the heat accumulator by passing the refrigerant to the regenerator in the first bypass circuit The efficiency of the heat pump operation can be improved by lowering the refrigerant temperature, and the heat stored in the heat accumulator is recovered from the heat accumulator by the second bypass circuit at the start of the next heat pump operation. by raising the temperature of the refrigerant entering the, before the temperature of the compressor rises well as can supply the high-temperature refrigerant, to improve the starting characteristic, Ru can improve system efficiency of the entire device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a configuration diagram of a heat pump hot water supply apparatus according to a first embodiment of the present invention.

  In FIG. 1, the first bypass circuit 8 connects the radiator 2 and the throttle means 3 in the heat pump refrigerant circuit 9 in which the compressor 1, the radiator 2, the throttle means 3, and the evaporator 4 are connected in an annular manner in order. The first circuit switching means 10 is provided and the second bypass circuit 11 is provided by bypassing the pipe connecting the compressor 1 and the radiator 2 and provided in the second circuit switching means 12. ing. The first bypass circuit 8 and the second bypass circuit 11 are connected to the heat accumulator 13, and the radiator 2 is configured to connect the hot water storage tank 6 and the circulation pump 5 in an annular manner in order to form a hot water supply circuit 14, and heat pump refrigerant A control device 17 is provided for switching and controlling the first circuit switching means 10 and the second circuit switching means 12 according to the detected values of the inlet temperature detecting means 15 and the outlet temperature detecting means 16 of the radiator 2 on the circuit 9 side. .

  About the heat pump hot-water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the hot water tank 6 is filled with low-temperature city water, the circulation pump 5 is operated in the hot water supply circuit 14 to supply low-temperature city water to the radiator 2, so that the heat pump refrigerant circuit The side 9 channel starts from a steady state operation in which the compressor 1, the radiator 2, the throttle means 3 and the evaporator 4 flow in this order. The hot water heated by the radiator 2 and heated to a high temperature is laminated downward from the top of the hot water tank 6 to form a temperature stratification.

  As time passes, the temperature of the water flowing out from the lower part of the hot water tank 6 rises and the inlet water temperature of the radiator 2 is raised. When it is detected that the outlet refrigerant temperature of the radiator 2 has risen on the refrigerant circuit side 9 side and the outlet temperature detection means 16 has reached a predetermined value or more, the controller 17 operates the first circuit switching means 10. The circuit is switched to the first bypass circuit 8 side. The high-temperature refrigerant dissipates heat in the heat accumulator 13 and lowers the temperature and flows into the throttling means 3, so that the operation is continued with the cycle efficiency kept high.

  After the heat storage operation is finished and the hot water supply load is generated, the heat pump operation is resumed when the amount of heat stored in the hot water storage tank 6 is insufficient. It takes time for the discharge temperature of the compressor 1 to rise. At this time, when the refrigerant temperature detected by the outlet temperature detection means 16 is not more than a predetermined value, the control device 17 operates the second circuit switching means 12 to switch the circuit to the second bypass circuit 11 side. The low-temperature refrigerant absorbs heat at the heat accumulator 13 connected to the second bypass circuit 11 to increase the temperature and flow into the radiator 2, so that hot hot water can be obtained immediately after the start of operation.

As described above, in the present embodiment, when the outlet temperature of the radiator 2 is high, the circuit is switched to the first bypass circuit 8 side to cause the heat accumulator 13 to store heat to reduce the refrigerant temperature, and when the operation is resumed. When the refrigerant temperature is low, the circuit is switched to the second bypass circuit 11 side, the refrigerant is heated by the heat accumulator 13, and the high temperature refrigerant is supplied to the radiator 2, so that the incoming water temperature to the radiator 2 is high. However, it can be operated with high efficiency, and high-temperature water will be produced in a short time even when the heat pump is started, so that the heat pump operation efficiency can be kept stable and high, and a heat pump water heater with excellent starting performance can be realized. it can.

( Reference Example 1 )
FIG. 2 shows a block diagram of the heat pump hot water supply apparatus of Reference Example 1 of the present invention. In FIG. 2, the second bypass circuit 11 is configured by bypassing a pipe connecting the evaporator 4 and the compressor 1 of the heat pump refrigerant circuit 9 and connecting to the heat accumulator 13.

  About the heat pump hot-water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when it is detected that the refrigerant temperature detected by the outlet temperature detection means 16 is not more than a predetermined value at the start of operation of the heat pump, the second circuit switching means 12 is operated by the control device 17 to activate the second bypass circuit 11. The circuit will be switched to the side. The low-temperature refrigerant absorbs heat by the heat accumulator 13 connected to the second bypass circuit 11 to increase the temperature and is sucked into the compressor 1. Therefore, the compressor 1 that sucked in the high-temperature refrigerant is the compressor 1 itself. As the temperature of the refrigerant is increased, the discharge temperature is also increased, so that the temperature of the refrigerant flowing into the radiator 2 is increased.

As described above, in this reference example , the second bypass circuit 11 connected to the heat accumulator 13 is provided by bypassing the pipe connecting the evaporator 4 of the heat pump refrigerant circuit 9 and the compressor 1. Therefore, when the heat pump is started, a high-temperature refrigerant is sucked into the compressor 1, the compressor 1 is heated, and the discharge temperature is raised, and the starting performance for raising the inlet refrigerant temperature of the radiator 2 in a short time is excellent. A heat pump hot water supply apparatus can be realized.

( Reference Example 2 )
FIG. 3 shows a configuration diagram of a heat pump hot-water supply apparatus according to Reference Example 2 of the present invention. In FIG. 3, the second bypass circuit 11 is configured by bypassing the radiator 2 of the hot water supply circuit 14 and connecting it to the heat accumulator 13.

  About the heat pump hot-water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when it is detected that the refrigerant temperature detected by the outlet temperature detecting means 16 is equal to or lower than a predetermined value at the start of the heat storage operation, the second circuit switching means 12 is operated by the control device 17 and the second bypass circuit 11 side. The circuit will be switched to By transporting low-temperature water to the heat accumulator 13 by the circulation pump 5, hot water that has absorbed heat from the heat accumulator 13 and has reached a high temperature is transported to the hot water storage tank 6.

As described above, in the present reference example , the heat pump refrigerant circuit is provided at the start of the heat storage operation by providing the second bypass circuit 11 that bypasses the radiator 2 of the hot water supply circuit 14 and connects to the heat accumulator 13. Until the refrigerant temperature is sufficiently increased at 9, low-temperature water is directly heated by the heat accumulator 13, and a high-efficiency heat pump hot-water supply device with excellent starting characteristics can be realized.

( Reference Example 3 )
FIG. 4 shows a configuration diagram of a heat pump hot-water supply apparatus according to Reference Example 3 of the present invention. In FIG. 4, the second bypass circuit 11 is configured by bypassing a pipe connecting the compressor 1 and the radiator 2 of the heat pump refrigerant circuit 9 to a heat accumulator 13 attached to the compressor 1.

  About the heat pump hot-water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, since the temperature of the compressor 1 becomes high during the heat pump operation, heat is radiated to the outside from the casing of the compressor 1, but since the heat accumulator 13 is mounted on the outer surface of the compressor 1, the compression is performed. The heat released from the machine 1 is stored in the heat accumulator 13. Even after the operation is completed, the heat is stored in the regenerator 13, and the compressor 1 is kept at a constant temperature. At the time of re-operation, the second circuit switching means 12 is operated to switch the circuit to the second bypass circuit 11 side so that heat is recovered from the heat accumulator 13 to the refrigerant, and the high-temperature refrigerant is conveyed to the radiator 2 so Will also produce hot water.

As described above, in this reference example , the second bypass circuit 11 connected to the heat accumulator 13 attached to the compressor 1 is bypassed by bypassing the piping connecting the compressor 1 and the radiator 2 of the heat pump refrigerant circuit 9. By providing, the compressor 1 is kept at a certain temperature or higher, the heat released from the compressor 1 is stored in the regenerator 13, and the refrigerant is heated at the start of re-operation. In this case, it is possible to realize a high-efficiency heat pump water heater excellent in start-up characteristics by preventing the stagnation of the refrigerant in the compressor 1 and recovering heat from the heat accumulator 13 at the start of operation.

( Embodiment 2 )
FIG. 5 shows a block diagram of a heat pump hot water supply apparatus according to the second embodiment of the present invention. In FIG. 5, in the fifth aspect of the invention, in particular, the first circuit switching means comprises a first on-off valve 18 and a first check valve 19, and the second circuit switching means 12 comprises a second on-off valve 20 and a second check valve. It consists of a valve 21.

  About the heat pump hot-water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the heat storage operation is started, the first on-off valve 18 and the second on-off valve 20 are closed, and the heat pump refrigerant circuit 9 formed in the order of the compressor 1, the radiator 2, the throttle means 3, and the evaporator 4 is used as the refrigerant. Circulates. As the heat storage operation ends, the incoming water temperature of the radiator 2 of the hot water supply circuit 14 increases, so the outlet temperature of the radiator 2 of the heat pump refrigerant circuit 9 also increases.

  When the outlet temperature detection means 16 detects a predetermined value or more, the control device 17 opens the first on-off valve 18 so that a part of the high-temperature refrigerant flows into the regenerator 13 and the temperature is lowered. It will flow into the throttle means 3. When restarting after a lapse of time after the end of the heat storage operation, it takes time for the refrigerant coming out of the compressor 1 to reach a predetermined temperature, so the inlet temperature detection means 15 detects a value lower than the predetermined value. To do.

  At this time, by opening the second on-off valve 20 with the control device 17, a part of the refrigerant flows into the heat accumulator 13 and is heated, so that the high-temperature refrigerant is conveyed to the radiator 2. The first bypass circuit 8 and the second bypass circuit are provided by providing the first check valve 19 in the first bypass circuit 8 and the second check valve 21 in the second bypass circuit 11 to prevent the refrigerant from flowing back. 11 can be merged into one heat exchanger for the heat accumulator 13.

  As described above, in the present embodiment, the combination of the on-off valve and the check valve stores heat in the heat accumulator 13 when the outlet temperature of the radiator 2 is high, and stores heat when the refrigerant temperature at the initial stage of re-operation is low. By recovering heat from the heater 13 and heating the refrigerant, a highly efficient heat pump hot water supply apparatus having a simplified configuration and high reliability and excellent starting characteristics can be realized.

  As described above, since the heat pump hot water supply apparatus according to the present invention can be operated with high efficiency, it can be applied to uses such as hot water supply, heating, clothes dryers, and industrial waste heat recovery apparatuses.

The block diagram of the heat pump hot-water supply apparatus in Embodiment 1 of this invention The block diagram of the heat pump hot-water supply apparatus in the reference example 1 of this invention The block diagram of the heat pump hot-water supply apparatus in the reference example 2 of this invention The block diagram of the heat pump hot-water supply apparatus in the reference example 3 of this invention The block diagram of the heat pump hot-water supply apparatus in Embodiment 2 of this invention Configuration diagram of conventional heat pump water heater

DESCRIPTION OF SYMBOLS 1 Compressor 2 Radiator 3 Throttling means 4 Evaporator 5 Circulating pump 6 Hot water storage tank 7 Mixing valve 8 First bypass circuit 9 Heat pump refrigerant circuit 10 First circuit switching means 11 Second bypass circuit 12 Second circuit switching means 13 Heat accumulator DESCRIPTION OF SYMBOLS 14 Hot-water supply circuit 15 Inlet temperature detection means 16 Outlet temperature detection means 17 Control apparatus 18 1st on-off valve 19 2nd check valve 20 1st on-off valve 21 2nd check valve

Claims (1)

A heat pump refrigerant circuit formed by sequentially connecting a compressor, a radiator, a throttle means, and an evaporator; a first bypass circuit that bypasses a pipe connecting the radiator and the throttle means; and is connected to the radiator. the hot water supply circuit having a hot water storage tank for hot water storage hot water heated by the radiator, the compressor and the second bypass circuit for bypassing the connecting pipe between the radiator, the second bypass and the first bypass circuit A heat accumulator for connecting a circuit, a first circuit switching means provided in the first bypass circuit, a second circuit switching means provided in the second bypass circuit, an inlet temperature detection means of the radiator, an outlet temperature detection means of the radiator, wherein the inlet temperature sensing means based on the detected value of the outlet temperature sensing means, controls the second circuit switching unit and the first circuit switching means The heat pump water heater, characterized in that configuration and the.

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