JP4462103B2 - Heat pump type water heater - Google Patents

Description

  The present invention relates to a method for operating a heat pump type hot water supply apparatus.

  A conventional heat pump hot water supply apparatus is as shown in FIG. 3 (see, for example, Patent Document 1). Hereinafter, the configuration of a conventional heat pump type hot water supply apparatus will be described with reference to FIG. FIG. 3 is a configuration diagram of a conventional heat pump hot water supply apparatus.

  A conventional heat pump hot water supply apparatus includes a compressor 101, a hot water supply heat exchanger 102 for exchanging heat between the refrigerant and water, an expansion valve 103 for reducing the pressure of the refrigerant, and an evaporator 104 for exchanging heat between the refrigerant and air in order. And a hot water storage tank 106, a pump 107 for sending water from the hot water storage tank 106 to the hot water supply heat exchanger 102, and a hot water supply heat exchanger 102 in this order, connected in a circular shape by a pipe 108, The hot water storage tank 106 is provided with a hot water supply pipe 109 for discharging hot water and a water supply pipe 110 for supplying water to the hot water storage tank 106.

When the heat pump type hot water supply apparatus having the above-described configuration is used, it is necessary to perform a process such as venting to remove air from the hot water supply circuit at the stage of installation work.
JP 2004-218965 A

  However, in the conventional heat pump type hot water supply apparatus, when forgetting processing such as air venting during installation work, air and water are mixed in the pipe 108, and in the hot water supply heat exchanger 102, water and refrigerant are mixed. Does not exchange heat well. Therefore, the refrigerant that is not heat-exchanged is sucked into the compressor 101, the pressure of the refrigerant discharged from the compressor 1 becomes abnormally high, and a general problem that the operation cannot be continued when forgetting a process such as air venting. was there.

  The present invention solves the above-mentioned conventional problems, and even when air is mixed in the water of the heat pump type hot water supply apparatus, the heat pump type hot water supply apparatus that can suppress the pressure of the refrigerant discharged from the compressor from rising. Is intended to provide.

In order to solve the conventional problems, a heat pump hot water supply apparatus of the present invention includes a compressor, a hot water heat exchanger, a decompression device, a refrigerant circuit in which an evaporator is sequentially connected in an annular manner, a hot water storage tank, and the hot water storage tank. In the case where a conveyance means for conveying water, a circulation circuit sequentially connecting the heat exchanger for hot water supply, and a pressure detection means for detecting the pressure of the refrigerant discharged from the compressor are detected, and the pressure detection means detects an abnormality In this case, the operation of the refrigerant circuit is stopped, the output amount of the conveying means is set to a constant value, and only the circulation circuit is operated for a certain period of time. Even when air is mixed in, the pressure of the refrigerant discharged from the compressor is suppressed from increasing, and operation is enabled.

  INDUSTRIAL APPLICABILITY The present invention can provide a heat pump type hot water supply apparatus that suppresses an increase in the pressure of refrigerant discharged from the compressor and enables operation even when air is mixed in the water of the heat pump type hot water supply apparatus.

The first invention is a refrigerant circuit in which a compressor, a hot water supply heat exchanger, a decompression device, and an evaporator are sequentially connected in an annular manner, a hot water storage tank, a transport means for transporting water in the hot water storage tank, and the hot water supply heat exchanger. And a pressure detection means for detecting the pressure of the refrigerant discharged from the compressor, and when the pressure detection means detects an abnormality, the operation of the refrigerant circuit is stopped, and the conveying means Is set to a constant value, and only the circulation circuit is operated for a certain period of time. As a result, the air in the circulation circuit circulates and moves into the hot water tank. Therefore, when the heat pump type hot water supply apparatus is operated next time, it is possible to suppress an increase in the pressure of the refrigerant discharged from the compressor.

  The second invention uses the pressure switch as the pressure detecting means in the first invention. By using the pressure switch, when the pressure detected by the compressor discharge refrigerant is detected as above, the pressure switch is turned off and the operation of the refrigerant circuit is stopped, the output amount of the conveying means is set to a constant value, and only the circulation circuit is constant. By operating for a period of time, the air in the circulation circuit circulates, and the next increase in the pressure of the refrigerant discharged from the compressor can be suppressed.

  In the third invention, in particular, in the first invention, a pressure sensor is used as the pressure detecting means. By using the pressure sensor, the pressure of the refrigerant discharged from the compressor can be accurately detected.

  In a fourth aspect of the invention, in particular, in any one of the first to third aspects of the invention, carbon dioxide is used as the refrigerant. Since carbon dioxide is relatively inexpensive and a stable refrigerant, it is possible to provide a heat pump hot water supply apparatus that is cheaper and more reliable.

(Embodiment 1)
FIG. 1 is a configuration diagram of a heat pump hot water supply apparatus according to Embodiment 1 of the present invention. Hereinafter, the configuration of the heat pump type hot water supply apparatus of the present invention will be described with reference to FIG.

  The heat pump hot water supply device 15 of the present invention includes a heat pump cycle unit 10 configured by sequentially connecting a compressor 1, a hot water supply heat exchanger 2, a decompression device 3, and an evaporator 4 in an annular manner through a refrigerant pipe 5, and a hot water supply. The hot water storage tank 11 for storing the liquid for use and the pump 12 which is a conveying means for sending the liquid in the hot water storage tank 11 to the hot water supply heat exchanger 2 and the hot water supply heat exchanger 2 are sequentially connected in an annular manner by a liquid pipe 13. The liquid cycle section 14, the pressure detection means 6 for detecting the pressure of the refrigerant discharged from the compressor 1, the microcomputer 7, the fan 8 for sending air to the heat exchange of the evaporator 4, and the fan 8 are operated. It is comprised with the fan motor 9 to be made. In the first embodiment, the compressor 1 uses an inverter type compressor.

  The operation and action of the heat pump hot water supply device 15 configured as described above will be described below. FIG. 2 is an operation flowchart of the heat pump hot water supply device 15.

  In FIG. 1 and FIG. 2, after the heat pump type hot water supply device 15 starts operating, the temperature state of the hot water heat exchanger 2 varies depending on the temperature of the outside air that exchanges heat with the refrigerant in the evaporator 4 and the rotational speed of the compressor 1. Therefore, if the temperature state of the hot water supply heat exchanger 2 is low, the refrigerant and water cannot efficiently exchange heat. Therefore, based on these situations, the microcomputer 7 determines the flow rate sent from the pump 12 to the hot water supply heat exchanger 2 and operates the heat pump type hot water supply device 15.

  However, the air venting work that must be performed during the installation work of the heat pump hot water supply device 15 is not performed, and air and water may be mixed in the liquid pipe 13 of the liquid cycle unit 14. If air and water are mixed, the heat exchange in the hot water supply heat exchanger 2 cannot be performed, and the refrigerant is sucked into the compressor 1 without heat exchange. May be abnormally high. When the pressure of the discharged refrigerant is normal, an operation based on the temperature state of the hot water supply heat exchanger 2 is performed.

In the first embodiment, a pressure switch is provided as the pressure detection means 6 in order to measure the pressure of the refrigerant discharged from the compressor 1. By providing the pressure switch, when the pressure of the refrigerant discharged from the compressor 1 is high, the pressure switch is turned off, the operation of the compressor 1 is stopped, and the operation of the heat pump cycle unit 10 is stopped.

  As shown in FIG. 2, when the pressure switch is turned off, the operation of the heat pump cycle unit 10 is stopped, but the operation of the pump 12 is continued, and a certain time Tf (for example, 3 minutes to 5 minutes) after the abnormality occurs Min)), only the liquid cycle section continues to operate. At this time, the flow rate α of the pump is arbitrary, but it is an amount in which water circulates. When a certain time Tf elapses, the operation of the pump 12 is stopped, the flow rate of the pump is set to zero, and the operation of the liquid cycle unit 14 is stopped.

  When a certain time Ts (for example, 5 minutes to 10 minutes) elapses after an abnormality occurs in the pressure of the refrigerant discharged from the compressor 1, the pressure value returns to a normal value, the pressure switch is turned on, and the heat pump cycle unit is turned on. Operation is possible.

  By performing such control, when the heat pump cycle unit 10 resumes operation next time, the air mixed in the liquid pipe 13 circulates, so that the heat exchange in the hot water supply heat exchanger 2 is normally performed. The pressure of the refrigerant discharged from the compressor 1 does not increase. Therefore, the operation of the heat pump hot water supply device 15 can be continued.

  Therefore, even when the process such as air venting is not performed at the time of installation work, an abnormality is not displayed on the remote controller of the heat pump hot water supply device 15 and the operation of the heat pump hot water supply device 15 can be continued.

  In the first embodiment, only the microcomputer 7 is used. However, the microcomputer 7 may be divided into a microcomputer for controlling the heat pump cycle part and a microcomputer for controlling the liquid cycle part. The refrigerant may be anything as long as heat can be exchanged in the refrigerant circuit. For example, by using relatively inexpensive and stable carbon dioxide, product cost can be reduced and reliability can be improved. Carbon dioxide is also friendly to the global environment because it has a zero ozone depletion potential and a very low global warming potential. In the first embodiment, the pressure detection means 6 is provided with a pressure switch. However, the pressure may be detected using a pressure sensor or a temperature sensor, and control may be performed based on the detected value. The fixed times Tf and Ts used in the first embodiment are arbitrary times and are values based on product design.

  As described above, the heat pump type hot water supply device 15 according to the present invention can operate the heat pump type hot water supply device 15 even if forgetting processing such as air venting. It can also be applied to the heating equipment used.

The block diagram of the heat pump type hot-water supply apparatus in Embodiment 1 of this invention Operation flow chart of the heat pump type hot water supply apparatus Configuration diagram of a conventional heat pump hot water supply device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Heat exchanger for hot water supply 3 Depressurizer 4 Evaporator 5 Refrigerant piping 6 Pressure detection means 7 Microcomputer 8 Fan 9 Fan motor 10 Heat pump cycle section 11 Hot water tank 12 Pump 13 Liquid piping 14 Liquid cycle section 15 Heat pump hot water supply apparatus

Claims (4)

A refrigerant circuit in which a compressor, a hot water supply heat exchanger, a decompression device, and an evaporator are sequentially connected in an annular manner, a hot water storage tank, a transport means for transporting water in the hot water storage tank, and a circulation circuit in which the hot water supply heat exchanger is connected in sequence And a pressure detection means for detecting the pressure of the refrigerant discharged from the compressor. When the pressure detection means detects an abnormality, the operation of the refrigerant circuit is stopped and the output amount of the transport means is kept constant. A heat pump type hot water supply device that is set to a value and operates only the circulation circuit for a certain period of time . The heat pump type hot water supply apparatus according to claim 1, wherein a pressure switch is used as the pressure detection means. The heat pump type hot water supply apparatus according to claim 1, wherein a pressure sensor is used as the pressure detection means. The heat pump type hot water supply apparatus according to any one of claims 1 to 3, wherein carbon dioxide is used as the refrigerant.

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