JP2011069502A - Heat pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump device capable of stably producing warm water by suppressing sharp increase of a pressure on a high pressure side in increasing an operational frequency of a compressor. <P>SOLUTION: This heat pump device includes a heat pump cycle configured by connecting the compressor 11, a water-refrigerant heat exchanger 21, a pressure reducing device 12 and an evaporator 13, a pump 22 for supplying hot water/water to the water-refrigerant heat exchanger 21, and a hot water supply temperature detecting means 23 for detecting an outlet temperature of the water-refrigerant heat exchanger 21, and the operational frequency of the compressor is increased in stages so that a temperature detected by the hot water supply temperature detecting means reaches a set hot water supply temperature. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a heat pump device that generates hot water using a heat pump.

  Conventionally, in a system where water is boiled using a refrigeration cycle such as a compressor, decompressor, evaporator, etc., the heating capacity is adjusted so that the operating frequency of the compressor can be varied based on the boiling hot water temperature to reach the preset hot water temperature. Controls that perform are proposed. And when the tapping temperature boiled by this control is lower than the set tapping temperature, the tapping temperature is adjusted by increasing the operating frequency of the compressor (see, for example, Patent Document 1).

In Patent Document 1, the set hot water temperature can be obtained quickly by increasing the operating frequency of the compressor and increasing the heating capacity.

JP 2003-222396 A

  However, in the control of the conventional heat pump device, when the hot water temperature is lower than the set hot water temperature, the operation frequency of the compressor is rapidly increased. FIG. 7 is a time chart of the operation frequency control of the compressor in the conventional form, FIG. 8 is a diagram showing a change in the Mollier diagram when the operation frequency control of the conventional compressor is performed, and FIG. It is the figure which showed control. As shown in FIG. 7 and FIG. 8, when the tapping temperature is lower than the set tapping temperature, the operating frequency of the compressor is increased at a stroke. As a result, the cycle B exceeds the originally required cycle B, and the cycle The state changes to the state C, and the high pressure rises more than necessary due to the overshoot, and the high pressure protection control is performed. As a result of the high pressure protection control, as shown in FIG. 9, when the predetermined pressure a is exceeded, the operating frequency of the compressor is lowered, and when the predetermined pressure b is exceeded, the compressor is operated. It may be stopped.

  The present invention solves the above-described conventional problems, and suppresses a rapid increase in pressure on the high-pressure side when increasing the operating frequency of the compressor, and can stably generate hot water. The purpose is to provide.

  In order to solve the above-described conventional problems, the heat pump device of the present invention supplies hot water to a heat pump cycle formed by connecting a compressor, a water refrigerant heat exchanger, a pressure reducing device, and an evaporator, and a water refrigerant heat exchanger. A pump and a tapping temperature detection means for detecting the outlet temperature of the water-refrigerant heat exchanger are provided, and the operating frequency of the compressor is increased stepwise so that the temperature detected by the tapping temperature detection means becomes the set tapping temperature. Thus, when the operating frequency of the compressor is increased, a rapid increase in high pressure can be suppressed, and the stability of the capacity of the heat pump device can be improved.

  The present invention can provide a heat pump device that can suppress the rapid increase in pressure on the high-pressure side when increasing the operating frequency of the compressor and can stably generate hot water.

The block diagram of the hot water heating apparatus using the heat pump apparatus in Embodiment 1 of this invention Time chart for operating frequency control of compressor in the first embodiment Time chart of operation frequency control of another compressor in the first embodiment Time chart of operation frequency control of another compressor in the first embodiment Time chart of operation frequency control and discharge pressure of another compressor in the first embodiment Mollier diagram of the hot water heater in Embodiment 1 Time chart of operation frequency control of compressor in conventional embodiment Mollier diagram in the conventional embodiment High voltage protection control diagram in the conventional embodiment

  A heat pump device according to a first aspect of the present invention includes a heat pump cycle formed by connecting a compressor, a water refrigerant heat exchanger, a decompression device, and an evaporator, a pump for supplying hot water to the water refrigerant heat exchanger, and a water refrigerant heat exchanger. The temperature of the compressor is increased stepwise so that the temperature detected by the tapping temperature detecting means becomes the set temperature of the tapping hot water, so that the operating frequency of the compressor is reduced. When raising, it is possible to suppress a rapid increase in high pressure and improve the stability of the capacity of the heat pump device.

  The heat pump device according to the second invention is the heat pump device according to the second invention, in particular in the first invention, by changing the range of increase in the operating frequency of the compressor according to the temperature difference between the temperature detected by the tapping temperature detecting means and the set tapping temperature. Thus, the rise on the high pressure side can be reliably suppressed.

In the heat pump device of the third invention, particularly in the first or second invention, when the temperature difference between the temperature detected by the tapping temperature detecting means and the set tapping temperature becomes smaller than a predetermined temperature, the operating frequency of the compressor is set. By not raising it, the rise on the high pressure side can be reliably suppressed.
There is a possibility of exceeding.
A heat pump device according to a fourth aspect of the present invention includes a pressure sensor for detecting the discharge pressure of the compressor, particularly in the first or second aspect of the invention, and a temperature difference between a temperature detected by the tapping temperature detecting means and a set tapping temperature. When the pressure is lower than the predetermined temperature and the pressure detected by the pressure sensor is equal to or higher than the predetermined pressure, the operating frequency of the compressor is not increased.

  As a result, even if the operating frequency is increased due to lack of capacity, there is a possibility that the high frequency protection control will be entered and the operating frequency may be reduced. Can be surely secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a hot water heating apparatus using the heat pump device according to Embodiment 1 of the present invention. In FIG. 1, a hot water heating device 40 of the present embodiment includes a refrigeration cycle component of a compressor 11, a decompression device 12, and an evaporator 13, and a heat pump unit 10 provided with a pressure sensor 14 that detects discharge pressure; It has a water exchange heat exchanger 21 that exchanges heat between the refrigerant and water, and a heat exchange unit 20 that has a circulating pump 22 that circulates water and is provided with a tapping temperature sensor 23 that is tapping temperature detecting means for detecting tapping temperature. ing.

Moreover, the hot water boiled and heat-exchanged by the hot water heater 40 is sent to the tank 30 by the pump 22, and the hot water is stored in the tank 30. The hot water stored in the tank 30 is sent to the hot water heating terminal 50 by the tank pump 31 to warm the living space.

  In the heat pump unit 10, the evaporator 13 performs heat exchange between the air and the refrigerant, and the compressor 11 compresses the refrigerant into a high-temperature and high-pressure refrigerant, and the refrigerant after the heat is radiated by the water refrigerant heat exchanger 21 of the heat exchange unit 20. A decompression device 12 for decompressing is disposed, and the water refrigerant heat exchanger 21, the decompression device 12, the evaporator 13, and the compressor 11 are sequentially connected in an annular manner through a refrigerant pipe to constitute a refrigeration cycle. Note that R410A, carbon dioxide, or the like is used as the refrigerant flowing in the refrigeration cycle.

  The hot water heating terminal 50 refers to a panel heater, a floor heating panel, or the like, and has a heat exchanger 51, and the hot water heated by the water-refrigerant heat exchanger 21 is allowed to flow into the heat exchanger 51 to pass through the living room. It is configured to warm up.

  FIG. 2 is a time chart of compressor operation frequency control. If the temperature difference between the set hot water temperature and the hot water temperature is greater than or equal to the predetermined value B1 after a predetermined time A1 has elapsed since the start of operation of the compressor, the operating frequency of the compressor is increased stepwise to increase the high pressure rapidly. While suppressing and improving the stability of the capacity of the hot water heater, it is possible to quickly obtain the set hot water temperature by increasing the heating capacity.

  FIG. 3 is a time chart of the operation frequency control of the compressor according to another embodiment. If the temperature difference between the set hot water temperature and the hot water temperature is greater than or equal to a predetermined value B2 after a predetermined time A1 has elapsed after the compressor starts operating, the operating frequency of the compressor is increased by a predetermined value C2. Further, when the temperature difference between the set hot water temperature and the hot water temperature is equal to or greater than a predetermined value B3, the operating frequency of the compressor is increased by a predetermined value C3. Furthermore, when the temperature difference between the set hot water temperature and the hot water temperature is equal to or greater than the predetermined value B4, the rapid increase in high pressure is suppressed by increasing the operating frequency of the compressor by the predetermined value C4, and the capacity stability of the hot water heater is improved. In addition, the set hot water temperature can be obtained quickly by increasing the heating capacity.

  FIG. 4 is a time chart of the operation frequency control of the compressor according to another embodiment. If the temperature difference between the set hot water temperature and the hot water temperature is equal to or greater than the predetermined value B5 when a predetermined time A1 has elapsed after the start of operation of the compressor, the operation frequency of the compressor is changed stepwise and the set hot water temperature and the hot water temperature. When the hot water temperature is increased by a predetermined value depending on the temperature difference and the hot water temperature becomes lower than the set hot water temperature by a predetermined value B6, the control for increasing the operating frequency of the compressor is stopped. By this control, it is possible to improve the stability of the capacity of the hot water heating apparatus by suppressing a rapid increase in high pressure and preventing the high pressure protection control described in FIG. 9 from being applied.

  FIG. 5 is a time chart of the operating frequency control and discharge pressure of the compressor in another embodiment. As described above, when the temperature difference between the set hot water temperature and the hot water temperature is equal to or greater than the predetermined value B5 when the predetermined time A1 has elapsed after the start of operation of the compressor, the operation frequency of the compressor is stepwise and the set hot water temperature. The temperature is raised by a predetermined value depending on the temperature difference with the tapping temperature, the tapping temperature is lower than the set tapping temperature by a predetermined value B6, and the discharge pressure is only a predetermined value D1 than the pressure entering the high pressure protection control region. When it becomes low, the control to increase the operating frequency of the compressor is stopped. By this control, it is possible to improve the stability of the capacity of the hot water heating apparatus by suppressing a rapid increase in high pressure and preventing the high pressure protection control described in FIG. 9 from being applied.

FIG. 6 is a Mollier diagram of the hot water heating apparatus in the first embodiment. Assuming that cycle A immediately before raising the operating frequency of the compressor is cycle A, the operating frequency of the compressor is increased stepwise and with a value determined in advance by the temperature difference between the set hot water temperature and the hot water temperature. When cycle C is set as originally required cycle D, the high pressure does not rise more than necessary due to the overshoot, so that the stability of the hot water heater is improved without applying high pressure protection control, and the heating capability is increased quickly. The set hot water temperature can be obtained.

  The configuration for obtaining the effects of the invention is not limited to that shown in FIG.

  As described above, the heat pump device of the present invention is used as a heat source of the hot water heating device that returns the tank and flows the hot water to the hot water heating terminal. However, the heat pump device is not limited to this. You may flow the warm water produced | generated with an exchanger.

DESCRIPTION OF SYMBOLS 10 Heat pump unit 11 Compressor 12 Pressure reducing device 13 Evaporator 14 Pressure sensor 20 Heat exchange unit 21 Water refrigerant heat exchanger 22 Circulation pump 23 Hot water temperature sensor 30 Tank 31 Tank pump 40 Hot water heating device 50 Hot water heating terminal 51 Heat exchanger ( Heating side)

Claims (4)

A heat pump cycle formed by connecting a compressor, a water refrigerant heat exchanger, a decompressor, and an evaporator, a pump that supplies hot water to the water refrigerant heat exchanger, and a hot water that detects an outlet temperature of the water refrigerant heat exchanger A heat pump device comprising: a temperature detection unit, wherein the operation frequency of the compressor is increased stepwise so that the temperature detected by the tapping temperature detection unit becomes a set tapping temperature. 2. The heat pump device according to claim 1, wherein an increase width of an operating frequency of the compressor is changed according to a temperature difference between a temperature detected by the tapping temperature detecting means and a set tapping temperature. 3. 3. The heat pump device according to claim 1, wherein when the temperature difference between the temperature detected by the tapping temperature detecting means and the set tapping temperature becomes smaller than a predetermined temperature, the operating frequency of the compressor is not increased. . A pressure sensor for detecting a discharge pressure of the compressor, a temperature difference between a temperature detected by the tapping temperature detecting means and a set tapping temperature is smaller than a predetermined temperature, and a pressure detected by the pressure sensor is The heat pump device according to claim 1 or 2, wherein when the pressure is equal to or higher than a predetermined pressure, the operating frequency of the compressor is not increased.

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