JP2009210201A - Heat pump type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein there is a possibility of causing a humming phenomenon and generating low frequency noise when a compressor and a hot water supply pressurization pump, a circulating pump and the hot water supply pressurization pump, and the compressor an the circulating pump are respectively operated at close frequencies. <P>SOLUTION: The heat pump type water heater is equipped with a hot water storage tank 1 storing hot water, the compressor 18, a coolant water heat exchanger 19, a decompressor 20, and an evaporator 21, a heat pump type heating means 2 for heating the hot water in the hot water storage tank 1, a hot water supply pipe 10 for supplying the hot water of the hot water storage tank 1, and the hot water supply pressurization pump 16 provided in a middle of the hot water supply pipe 10 and carrying out pressurization hot water supply of supply hot water. A frequency determining means 30 is provided for determining whether an operating frequency of the compressor 18 and an operating frequency of the water supply pressurization pump 16 come close, and if the frequency determination means 30 determines that the frequencies come close, the operating frequency of the hot water supply pressurization pump 16 is corrected by a predetermined frequency portion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat pump hot water supply apparatus that heats hot water in a hot water storage tank with a heat pump.

  Conventionally, in this type of heat pump type hot water supply apparatus, a heat pump type heating means for heating hot water in the hot water storage tank, comprising a hot water storage tank for storing hot water, a compressor, a refrigerant water heat exchanger, a decompressor, and an evaporator. A heat pump circulation circuit having a circulation pump for circulatingly connecting the water side of the refrigerant water heat exchanger of the heat pump heating means and the hot water storage tank, and a hot water supply pipe for supplying hot water from the hot water storage tank The one with is known. (Patent Document 1)

A configuration is also known in which a hot water pressurizing pump for pressurizing a hot water supply pressure is provided in the middle of a hot water supply pipe when a difference in height to a hot water supply destination is large and a hot water supply pressure is insufficient. (Patent Document 2)
JP 2007-263393 A JP 2007-263394 A

  However, in these heat pump type hot water supply apparatuses, a beat phenomenon occurs when the compressor and the hot water supply pressure pump, the circulation pump and the hot water supply pressure pump, and the compressor and the circulation pump are operated at close frequencies. Could cause low frequency noise.

  In order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a compressor, a refrigerant water heat exchanger, a decompressor, and an evaporator, and heats the hot water in the hot water storage tank. In a heat pump type hot water supply apparatus comprising a heat pump type heating means, a hot water supply pipe for supplying hot water in the hot water storage tank, and a hot water supply pressure pump provided in the middle of the hot water supply pipe for hot water supply. Frequency determining means for determining whether or not the operating frequency of the compressor and the operating frequency of the hot water pressurizing pump are close to each other, and when the frequency determining means determines that the frequencies are close to each other, The frequency is corrected by a predetermined frequency.

  Further, in claim 2, there is provided a hot water storage tank for storing hot water, a compressor, a refrigerant water heat exchanger, a decompressor, an evaporator, a heat pump heating means for heating the hot water in the hot water storage tank, and the heat pump type A heat pump circulation circuit having a circulation pump for circulatingly connecting the water side of the refrigerant water heat exchanger of the heating means and the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, and the hot water supply pipe In a heat pump type hot water supply apparatus provided with a hot water pressurizing pump that pressurizes and supplies hot water, provided in the middle, a frequency for determining whether the operating frequency of the circulating pump and the operating frequency of the hot water pressurizing pump are close to each other A discriminating unit is provided, and when the frequency discriminating unit discriminates that the frequencies are close to each other, the operating frequency of the hot water supply pressurizing pump is corrected by a predetermined frequency.

  Further, in claim 3, a hot water storage tank for storing hot water, a compressor, a refrigerant water heat exchanger, a decompressor, an evaporator, a heat pump heating means for heating the hot water in the hot water storage tank, and the heat pump type A heat pump comprising a heat pump circulation circuit having a circulation pump for circulatingly connecting the water side of the refrigerant water heat exchanger of the heating means and the hot water storage tank, and a hot water supply pipe for supplying hot water of the hot water storage tank In the type hot water supply apparatus, a frequency discriminating unit that discriminates whether or not the operating frequency of the compressor and the operating frequency of the circulation pump are close to each other, and when the frequency discriminating unit determines that the frequencies are close to each other, The operating frequency of any one of the circulation pumps is corrected by a predetermined frequency.

  Further, in Claims 4, 5, and 6, in the first aspect, the frequency discrimination means discriminates the command frequencies of the compressor and the hot water pressurizing pump, and discriminates that the command frequencies are close to each other. A configuration for detecting operating frequencies of the compressor and the hot water pressurizing pump and determining that the detected frequencies are close to each other, or an instruction frequency for either the compressor or the hot water pressurizing pump It discriminate | determines, it is set as the structure which detects the other operation frequency and discriminate | determines that the instruction | indication frequency and the detection frequency adjoined.

  Further, according to Claims 7, 8, and 9, according to Claim 2, the frequency discriminating means discriminates the command frequencies of the circulation pump and the hot water pressurizing pump, and discriminates that the command frequencies are close to each other. A configuration for detecting operating frequencies of the circulating pump and the hot water pressurizing pump and determining that the detected frequencies are close to each other, or an instruction frequency for either the hot water pressurizing pump or the circulating pump. It discriminate | determines, it is set as the structure which detects the other operation frequency and discriminate | determines that the instruction | indication frequency and the detection frequency adjoined.

  Further, in Claims 10, 11, and 12, in the third aspect, the frequency discrimination means discriminates the command frequencies of the compressor and the circulation pump and discriminates that the command frequencies are close to each other. The configuration for detecting the operating frequency of the compressor and the circulating pump and determining that the detected frequencies are close to each other, or determining the indicated frequency of either the compressor or the circulating pump, The operation frequency is detected, and it is determined that the instruction frequency and the detection frequency are close to each other.

  In this way, when there is a possibility that a beating phenomenon occurs due to the close proximity of the operating frequencies, the one operating frequency is corrected by a predetermined frequency, so the beating phenomenon is eliminated and the occurrence of low frequency vibrations can be suppressed.

Next, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, 1 is a hot water storage tank for storing hot water, 2 is a heat pump heating means for heating hot water in the hot water storage tank 1, 3 is a heating forward pipe 4 connected to the lower part of the hot water storage tank 1, and the above-mentioned A heat pump circulation circuit comprising a heating return pipe 5 connected to the upper part of the hot water storage tank 1, 6 is connected to the lower part of the hot water storage tank 1 and supplies water to the hot water storage tank 1, and 7 is connected to the upper part of the hot water storage tank 1. This is a tapping pipe for tapping hot water that is connected and stored.

  8 is a water supply bypass pipe branched from the water supply pipe 6, 9 is a mixing valve that mixes hot water from the tap water pipe 7 and water from the water supply bypass pipe 8 to make hot water at a hot water supply set temperature, and 10 is mixed by the mixing valve 9 A hot water supply pipe for supplying hot water to the hot water tap 11, 12 is provided in the middle of the hot water supply pipe, a hot water supply temperature sensor for detecting the hot water supply temperature, 13 is provided in the water supply pipe 6, and a hot water supply pressure applied to the hot water storage tank 1 is determined. A pressure reducing valve for depressurizing, 14 is a relief valve for releasing the expanded water accompanying the heating of the hot water in the hot water storage tank 1, and 15 is a plurality of hot water storage temperatures for detecting the temperature of the hot water in the hot water storage tank 1. It is a sensor.

  A hot water supply / pressure pump 16 is provided in the middle of the hot water supply pipe 10 to pressurize and supply hot water, and 17 is provided between the hot water supply / pressure pump 16 and the hot water tap 11. 11 is a hot water supply pressure sensor for detecting that 11 is opened.

  The heat pump heating means 2 includes a compressor 18 that compresses the refrigerant, a refrigerant water heat exchanger 19 that exchanges heat between the high-temperature and high-pressure refrigerant and the hot water in the hot water storage tank 1, and a refrigerant water heat exchanger 19 that has passed through. A heat pump cycle 22 in which an electronic expansion valve 20 serving as a decompressor for decompressing the refrigerant and an air heat exchanger 21 serving as an evaporator for evaporating the low-temperature and low-pressure refrigerant from the electronic expansion valve 20 are annularly connected by a refrigerant pipe; A circulation pump 23 is provided in the middle of the heat pump circulation circuit 3 on the water side of the refrigerant water heat exchanger 19 to circulate hot water in the hot water storage tank 1. Here, the refrigerant water heat exchanger 19 is a counter flow type heat exchanger in which the flow direction of the refrigerant and the flow direction of the water to be heated are opposed to each other.

  A refrigerant discharge temperature sensor 24 is provided between the compressor 18 and the refrigerant water heat exchanger 19 to detect the refrigerant discharge temperature, and 25 is provided between the refrigerant water heat exchanger 19 and the electronic expansion valve 20. , An outflow temperature sensor for detecting the outflow temperature of the refrigerant from the refrigerant water heat exchanger 19, 26 is provided on the air inlet side of the air heat exchanger 21, and is an outside temperature sensor for detecting the outside air temperature, and 27 is a refrigerant water heat exchange. An incoming water temperature sensor that detects the incoming water temperature on the water side of the vessel 19, and 28 is a boiling temperature sensor that detects the boiling temperature on the water side of the refrigerant water heat exchanger 19.

  29 is a control means composed of a microcomputer or the like that controls the operation of each device by receiving the output of each sensor and operates the heat pump type hot water supply apparatus. The actual usage of hot water such as the maximum value and the average value of the past hot water supply amount is shown. Estimated from the amount of remaining hot water in the hot water storage tank 2 detected by the hot water storage temperature sensor 12 and the actual results of the daytime boiling increase operation, the target boiling temperature is in the range of 65 ° C to 90 ° C so as to ensure the predicted amount of hot water supply the next day. The operating frequency of the compressor 18 and the operating frequency of the circulation pump 23 are determined with reference to a data table stored in advance from the outside air temperature, the target boiling temperature and the incoming water temperature, and control is performed so as to operate at the operating frequency. Thus, the boiling operation is performed.

  When the hot-water tap 11 is opened, the control means 29 detects that the hot-water tap 11 has been opened by the hot-water pressure sensor 17, and drives the hot-water pressure pump 16 at a predetermined operating frequency. Then, city water flows from the water supply pipe 6 at the lower part of the hot water storage tank 1, and hot water heated and stored in the hot water storage tank 1 from the upper part of the hot water storage tank 1 is discharged into the hot water discharge pipe 7. Hot water and city water from the feed water bypass pipe 8 are mixed by the mixing valve 9. Here, the control means 29 adjusts the mixing ratio of the mixing valve 9 so that the hot water temperature after mixing detected by the hot water temperature sensor 12 becomes a hot water supply set temperature set by a remote controller (not shown) or the like, Hot water at a hot water supply set temperature is supplied from the hot water tap 11 at high pressure.

  Reference numeral 30 denotes a frequency discriminating unit provided as a function of the control unit 29, which discriminates the operating frequency of the hot water supply pressurizing pump 16, the operating frequency of the compressor 18 and the operating frequency of the circulation pump 23, respectively. It is to determine whether or not.

  Here, the frequency discriminating means 30 refers to the data table stored in advance by the control means 29 based on the operating conditions at that time (outside air temperature, target boiling temperature, incoming water temperature, etc.). The operation frequency of the circulation pump 23 is determined with reference to the operation frequency instructed by the control means 29 to the circulation pump 23, and the operation frequency of the hot water supply pressurizing pump 16 is stored in advance. The operation frequency is determined.

  When the frequency discriminating means 30 discriminates that the operating frequency of the hot water supply pressurizing pump 16 and the operating frequency of the compressor 18 or the circulation pump 23 coincide with each other, or the frequency is less than a predetermined several hertz, the control means In operation 29, the operation frequency of the hot water supply pressure pump 16 is corrected by a frequency of a predetermined several hertz or more so as to be away from the operation frequency of the compressor 18 or the operation frequency of the circulation pump 23. It should be noted that if the frequency difference is large, it is difficult to recognize it as a beating phenomenon, and this is not a problem in practice.

  Thus, when the operation frequency of the hot water supply pressure pump 16 and the operation frequency of the compressor 18 or the circulation pump 23 are close to each other, the operation frequency of the hot water supply pressure pump 16 is changed to the operation frequency of the compressor 18 or the circulation pump 23. Since the correction is made so as to be away from the beat, the beat phenomenon is eliminated and the occurrence of low-frequency vibration can be suppressed. At this time, since the operating frequency of the compressor 18 or the circulation pump 23 is not corrected, it is possible to prevent the boiling operation from being affected.

  When the frequency discriminating means 30 discriminates that the operating frequency of the compressor 18 and the operating frequency of the circulating pump 23 are equal or different from each other by a frequency not exceeding a predetermined several hertz, the control means 29 Operation is performed by correcting one of the circulating pumps 23 by a predetermined frequency of several hertz or more so as to be away from the other operating frequency.

  In this way, when the operation frequency of the compressor 18 and the operation frequency of the circulation pump 23 are close to each other, the operation frequency of either the compressor 18 or the circulation pump 23 is corrected so as to be away from the other operation frequency. Therefore, the beat phenomenon is eliminated and the generation of low frequency vibration can be suppressed.

  Here, the frequency discriminating means 30 may be configured to detect and discriminate actual operating frequencies of the hot water supply pressure pump 16, the compressor 18, and the circulation pump 23. For example, the operating frequency of the compressor 18 may be determined as described above. The operation frequency of the circulation pump 23 is determined by determining the command frequency so that the actual operation frequency is detected, and the other is determined by the combination so that the other is determined by the detection frequency. Anyway, it is good.

  In this way, when there is a possibility that a beating phenomenon may occur due to the close proximity of the operating frequency, one operating frequency is corrected by a predetermined frequency, so that the beating phenomenon disappears and the occurrence of low frequency vibrations is suppressed, and annoying noise is generated. Can be reduced.

  The present invention is not limited to the above-described embodiment, and can be modified without changing the gist. For example, the heat pump type hot water supply apparatus itself includes a hot water storage tank unit, a heat pump unit, and a pressure pump unit. The control means 29 may be divided into a plurality of control means.

The schematic block diagram of the heat pump type hot water supply apparatus of one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heat pump type heating means 3 Heaton circulation circuit 4 Hot-water supply pipe 5 Hot-water supply pressure pump 6 Compressor 7 Refrigerant water heat exchanger 8 Electronic expansion valve (decompressor)
9 Air heat exchanger (evaporator)
DESCRIPTION OF SYMBOLS 10 Circulation pump 11 Refrigerant discharge temperature sensor 12 Frequency discrimination means

Claims (12)

  A hot water storage tank for storing hot water, a compressor, a refrigerant water heat exchanger, a decompressor, an evaporator, a heat pump heating means for heating the hot water in the hot water storage tank, and for supplying hot water in the hot water storage tank In a heat pump type hot water supply apparatus provided with a hot water supply pipe and a hot water supply pressure pump provided in the middle of the hot water supply pipe for pressurizing hot water supply, the operation frequency of the compressor and the operation frequency of the hot water supply pressure pump are close to each other. A heat pump characterized by comprising frequency discriminating means for discriminating whether or not the frequency has been close, and when the frequency discriminating means discriminates that the frequencies are close to each other, the operating frequency of the hot water supply pressurizing pump is corrected by a predetermined frequency. Water heater.   A hot water storage tank for storing hot water, a compressor, a refrigerant water heat exchanger, a decompressor, an evaporator, a heat pump heating means for heating the hot water in the hot water storage tank, and the refrigerant water heat of the heat pump heating means A heat pump circulation circuit having a circulation pump that circulates between the water side of the exchanger and the hot water storage tank, a hot water supply pipe for supplying hot water from the hot water storage tank, and a hot water supply pipe provided in the middle of the hot water supply pipe. In the heat pump type hot water supply apparatus provided with a hot water pressurizing pump that pressurizes and supplies hot water, there is provided frequency discriminating means for discriminating whether or not the operation frequency of the circulating pump and the operation frequency of the hot water pressurization pump are close to each other. A heat pump hot water supply, wherein when the determining means determines that the frequencies are close, the operating frequency of the hot water pressurizing pump is corrected by a predetermined frequency. Location.   A hot water storage tank for storing hot water, a compressor, a refrigerant water heat exchanger, a decompressor, an evaporator, a heat pump heating means for heating the hot water in the hot water storage tank, and the refrigerant water heat of the heat pump heating means In the heat pump type hot water supply apparatus comprising: a heat pump circulation circuit having a circulation pump that connects the water side of the exchanger and the hot water storage tank so as to be circulated; and a hot water supply pipe for supplying hot water of the hot water storage tank; A frequency discriminating unit for discriminating whether or not the operating frequency of the machine and the operating frequency of the circulating pump are close to each other, and when the frequency discriminating unit determines that the frequencies are close to each other, either the compressor or the circulating pump A heat pump type hot water supply apparatus characterized in that the operation frequency of is corrected by a predetermined frequency.   2. The heat pump type hot water supply apparatus according to claim 1, wherein the frequency discriminating unit discriminates the command frequencies of the compressor and the hot water supply pressurizing pump and discriminates that the command frequencies are close to each other. .   The heat pump type hot water supply apparatus according to claim 1, wherein the frequency determining means detects operating frequencies of the compressor and the hot water supply pressurizing pump, and determines that the detected frequencies are close to each other. .   The frequency discriminating means discriminates the instruction frequency of either the compressor or the hot water pressurizing pump, detects other operating frequencies, and discriminates that the instruction frequency and the detection frequency are close to each other. The heat pump type hot water supply apparatus according to claim 1.   3. The heat pump type hot water supply apparatus according to claim 2, wherein the frequency discriminating unit discriminates the command frequencies of the circulation pump and the hot water pressurizing pump, and discriminates that the command frequencies are close to each other. .   3. The heat pump type hot water supply apparatus according to claim 2, wherein the frequency discriminating means detects operating frequencies of the circulation pump and the hot water supply pressurizing pump and discriminates that the detected frequencies are close to each other. .   The frequency discriminating means discriminates the instruction frequency of either the hot water pressurizing pump or the circulation pump, detects other operation frequencies, and discriminates that the instruction frequency and the detection frequency are close to each other. The heat pump type hot-water supply apparatus according to claim 2.   4. The heat pump type hot water supply apparatus according to claim 3, wherein the frequency discriminating unit discriminates the command frequencies of the compressor and the circulation pump and discriminates that the command frequencies are close to each other.   4. The heat pump hot water supply apparatus according to claim 3, wherein the frequency discrimination means detects operating frequencies of the compressor and the circulation pump and discriminates that the detected frequencies are close to each other.   The frequency discriminating means discriminates an instruction frequency of either the compressor or the circulation pump, detects an operation frequency other than that, and discriminates that the instruction frequency and the detection frequency are close to each other. The heat pump type hot water supply apparatus according to claim 3.

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