JP5824609B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump type water heater.

  Conventionally, this type of heat pump type hot water heater is provided with a pressure switch that should be operated when the refrigeration cycle is abnormal in high pressure, and stops driving the compressor of the heat pump unit when the pressure switch is activated (for example, , See Patent Document 1).

  Further, when the high pressure protection device is activated, it is determined whether the abnormality of the heat pump cycle or the abnormality of the circulation system that circulates the liquid in the hot water tank through the liquid pipe is activated. Some of them are determined and displayed (for example, see Patent Document 2).

Japanese Patent Application Laid-Open No. 2004-116892 JP 2009-243774 A

  However, as in the conventional configuration, it is common to provide a high-pressure protection device that stops the operation of the compressor when the pressure in the refrigerant pipe reaches a predetermined pressure value. In addition to the fact that the operation cannot be continued by suppressing the increase in high pressure, and not only the abnormality of the heat pump cycle configured by connecting the refrigerant pipes in an annular shape, the hot water storage tank for storing hot water and the liquid in the hot water storage tank The high-pressure protection device also operates due to an abnormality in the circulating water system in the liquid piping that can be circulated through the heat exchanger, and it is difficult to specify which circuit is faulty, resulting in poor serviceability.

The present invention solves the above-described conventional problem, and allows the operation to continue as much as possible even when the refrigerant pressure rises. If the operation cannot be continued, whether the heat pump cycle is abnormal or not It aims at providing the heat pump type hot water heater which can judge whether it is an abnormality of the circulating water system of the side.

In order to solve the above-described conventional problems, the heat pump water heater of the present invention is a heat pump cycle formed by connecting a compressor, a hot water heat exchanger, a decompressor, and a heat source heat exchanger with refrigerant piping, A hot water storage tank for storing hot water supply liquid, a liquid pipe in which the liquid in the hot water tank circulates through the heat exchanger for hot water supply, a pump for circulating the liquid in the liquid pipe, and a high pressure in the refrigerant pipe A high pressure detecting means for detecting a side pressure, a hot water temperature detecting means for detecting a hot water temperature of the hot water supply heat exchanger, and a control device , wherein the control device has a high pressure side pressure in the refrigerant pipe . When the predetermined value of 1 is reached, the rotational speed of the pump is increased, and the high-pressure side pressure after the elapse of a predetermined time after the rotational speed of the pump is increased is higher than the first predetermined value. If it exceeds a predetermined value, the compression When the compressor is stopped, the control device increases the hot water temperature A when the high-pressure side pressure reaches the first predetermined value and the rotational speed of the pump. When the difference from the hot water temperature B after a predetermined time has passed is a predetermined value or more, it is determined that the heat pump cycle is abnormal, and when the difference is less than the predetermined value, the liquid circulates in the path. those characterized that you determined to be abnormal. The heat pump type hot water heater of the present invention includes a heat pump cycle formed by connecting a compressor, a heat exchanger for hot water supply, a pressure reducing device, and a heat source heat exchanger with a refrigerant pipe, and a hot water storage tank for storing hot water supply liquid. A liquid pipe through which the liquid in the hot water tank circulates via the heat exchanger for hot water supply, a pump through which the liquid in the liquid pipe circulates, and a high pressure detection means for detecting the high pressure side pressure in the refrigerant pipe And a hot water temperature detecting means for detecting a hot water temperature of the hot water supply heat exchanger, a hot water temperature detecting means for detecting a hot water temperature of the hot water heat exchanger, and a control device, the control device comprising: When the high-pressure side pressure in the refrigerant pipe reaches a first predetermined value, the rotational speed of the pump is increased, and the high-pressure side pressure after a predetermined time has elapsed after the rotational speed of the pump is increased. A second higher than a predetermined value of 1 The compressor is stopped when a predetermined value is exceeded, and the control device, when the compressor is stopped, increases the incoming water temperature and the water temperature after a predetermined time has elapsed after increasing the rotational speed of the pump. If the difference with the tapping temperature is less than or equal to a predetermined value, it is determined that the heat pump cycle is abnormal, and if the difference exceeds the predetermined value, it is determined that there is an abnormality in the path through which the liquid circulates. It is characterized by this.

  Thereby, when the pressure rises, the pressure rise can be suppressed by increasing the heat exchange amount in the hot water heat exchanger.

  According to the present invention, it is possible to continue the operation as much as possible even when the refrigerant pressure increases, and when the operation cannot be continued, it is an abnormality of the heat pump cycle or an abnormality of the circulating water system on the hot water supply side. It is possible to provide a heat pump type water heater that can determine whether or not.

The block diagram of the heat pump type water heater in Embodiment 1 of this invention Operation diagram of the heat pump water heater High pressure suppression operation chart of the same heat pump type water heater Abnormality detection chart of the same heat pump type water heater High-pressure suppression operation and abnormality detection chart of the same heat pump type water heater Other high-pressure suppression operation and abnormality detection chart of the same heat pump type water heater

A first aspect of the present invention is a heat pump cycle formed by connecting a compressor, a hot water supply heat exchanger, a pressure reducing device, and a heat source heat exchanger with refrigerant piping, a hot water storage tank for storing hot water supply liquid, and the hot water storage tank A liquid pipe for circulating the liquid in the hot water supply heat exchanger, a pump for circulating the liquid in the liquid pipe, a high pressure detecting means for detecting a high pressure side pressure in the refrigerant pipe, and the hot water supply A hot water temperature detecting means for detecting the hot water temperature of the heat exchanger, and a control device , wherein the control device rotates the pump when the high-pressure side pressure in the refrigerant pipe reaches a first predetermined value. The compressor is stopped when the high-pressure side pressure after a predetermined time elapses after exceeding the second predetermined value higher than the first predetermined value after increasing the number of rotations of the pump And the control device stops the compressor. In this case, the difference between the tapping temperature A when the high-pressure side pressure reaches the first predetermined value and the tapping temperature B after elapse of a predetermined time after increasing the rotational speed of the pump is greater than or equal to a predetermined value. of determining that is the abnormality of the heat pump cycle when heat pump type hot-water supply if the difference is less than the predetermined value, characterized that you determined to be abnormal in the path which the liquid is circulated By increasing the amount of heat exchange in the hot water supply heat exchanger when the pressure rises, the pressure rise can be suppressed.

Further, even if the number of rotations of the pump is increased, the operation of the compressor is stopped when the high-pressure side pressure in the refrigerant pipe rises. In the event of a fundamental failure of the circulating water system, stop.

In addition, a temperature detection unit is provided at the liquid pipe side outlet of the hot water supply heat exchanger, and based on a detection value of the temperature detection unit, an abnormality in the heat pump cycle or a circulation system for circulating the liquid in the liquid pipe It is characterized in that it is configured to determine and display whether there is an abnormality.

  Accordingly, when only the outlet temperature of the hot water supply heat exchanger is detected, an outlet temperature that decreases due to an increase in the amount of heat exchange in the hot water supply heat exchanger due to an increase in the pump rotation speed is detected. Since the system is operating normally, it is detected that the heat pump cycle is abnormal, and if there is no temperature drop, it can be determined that there is an abnormality in the circulation system that circulates the liquid.

According to a second aspect of the present invention, there is provided a heat pump cycle formed by connecting a compressor, a hot water supply heat exchanger, a decompression device, and a heat source heat exchanger by a refrigerant pipe, a hot water storage tank for storing hot water supply liquid, and the hot water storage tank A liquid pipe for circulating the liquid in the hot water supply heat exchanger, a pump for circulating the liquid in the liquid pipe, a high pressure detecting means for detecting a high pressure side pressure in the refrigerant pipe, and the hot water supply A hot water temperature detecting means for detecting the incoming water temperature of the heat exchanger, an incoming water temperature detecting means for detecting the hot water temperature of the heat exchanger for hot water supply, and a control device, wherein the control device is provided in the refrigerant pipe. When the high-pressure side pressure reaches the first predetermined value, the rotational speed of the pump is increased, and the high-pressure side pressure after a predetermined time has elapsed from the increase of the rotational speed of the pump is greater than the first predetermined value. Higher than the second predetermined value The compressor is stopped, and when the compressor is stopped, the control device determines a difference between the incoming water temperature and the outgoing hot water temperature after a predetermined time has elapsed after increasing the rotational speed of the pump. heat pump when a value less is determined to be abnormal in the heat pump cycle, when the difference exceeds the predetermined value, characterized in that the liquid is determine the constant to be abnormal in the path of circulating This is a water heater .

  As a result, in the detection method based on the inlet temperature and outlet temperature of the heat exchanger for hot water supply, if the inlet temperature and outlet temperature are close due to an increase in pump rotation speed, the circulation system that circulates the liquid operates normally. When it is detected that the heat pump cycle is abnormal and there is a temperature difference, it can be determined that there is an abnormality in the circulation system for circulating the liquid.

According to a third aspect of the present invention , there is provided a discharge temperature detecting means for detecting a discharge temperature of the refrigerant discharged from the compressor, and the control device is configured such that the high-pressure side pressure in the refrigerant pipe reaches a first predetermined value. , Increase the rotational speed of the pump, and increase the rotational speed of the pump after a predetermined time has elapsed.
The compressor is stopped when the discharge temperature exceeds a third predetermined value .

  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 shows a configuration diagram of a heat pump type water heater in Embodiment 1 of the present invention.

  A heat pump cycle in which a compressor 1, a hot water supply heat exchanger 2, a pressure reducing device 3, and a heat source heat exchanger 4 are connected in an annular shape by a refrigerant pipe 5, and the valve opening of the pressure reducing device 3 can be adjusted, and for hot water supply A hot water storage tank 6 for storing the liquid, a liquid pipe 8 through which the liquid in the hot water tank can circulate through the hot water supply device, a pump 7 for circulating the liquid in the hot water tank through the liquid pipe, and a high pressure in the refrigerant pipe 5. High-pressure detection means 9 for detecting the high-pressure side pressure of the heat pump cycle from the electric energy and the rotational speed of the compressor 1 and the evaporation temperature of the heat source heat exchanger 4 and the incoming water temperature detection for detecting the incoming water temperature of the hot water supply heat exchanger 2 It comprises means 10, a hot water temperature detection means 11 for detecting the hot water temperature, and a discharge temperature detection means 12 for detecting the discharge refrigerant temperature of the compressor 1.

  FIG. 2 shows the operation of the pump 7 of the heat pump type water heater of the present invention.

  When the pressure recognized by the high pressure detecting means 9 exceeds a predetermined set value α, first, the rotational speed of the pump 7 is greatly increased from the normal state, and the heat exchange amount in the hot water supply heat exchanger 2 is increased. Suppresses the pressure rise.

  If the pressure still rises and reaches a preset value β, the compressor is stopped. If the pressure falls below α ′ due to an increase in the number of rotations of the pump 7, the pump 7 returns to the normal control.

  FIG. 3 is a chart showing the high pressure suppression operation of the heat pump type hot water heater of the present invention. When the pressure recognized by the high pressure detecting means 9 exceeds the set value α, the rotational speed of the pump 7 is increased.

  In addition, the temperature A of the hot water temperature detection means 11 at this time is stored, and the timer count is started at the same time. When a predetermined time γ elapses with the pump 7 rotating speed increased, the temperature B of the tapping temperature detecting means 11 is stored and determined.

  When the pressure further increases and exceeds the set value β, the compressor 1 is stopped. At this time, the temperature B of the tapping temperature detecting means 11 is stored and determined. When the pressure is suppressed and falls below the set value α ′, the control returns to the control of the pump 7 at the normal set hot water temperature, and the temperature A stored value and the timer are reset.

  FIG. 4 is a chart showing an abnormality detection operation of the heat pump type hot water heater. When the temperature B is determined, the compressor 1 is stopped and compared with the temperature A. If the temperature AB is equal to or higher than the set value C, the number of rotations of the pump 7 is increased and the heat exchange amount in the hot water supply heat exchanger 2 is increased. Since the detection temperature of the hot water temperature detection means 11 can be reduced, it is determined that there is no abnormality in the circulation system that circulates the liquid in the hot water tank 6 through the liquid pipe 8, and the heat pump cycle abnormality is displayed. To do.

If it is less than the set value C, the amount of heat exchange in the hot water supply heat exchanger 2 is not increased despite the increase in the number of revolutions of the pump 7, so that the liquid in the hot water tank 6 is circulated through the liquid pipe 8. Displayed as abnormal circulation system.

  FIG. 5 is a chart showing the abnormality detection operation of the heat pump type hot water heater of the present invention.

  When the pressure recognized by the high pressure detecting means 9 exceeds the set value α, the rotational speed of the pump 7 is increased. In addition, the timer count is started.

  When a predetermined time elapses with the pump 7 rotating speed increased, the temperature D of the incoming water temperature detecting means 10 and the temperature E of the hot water temperature detecting means 11 are stored and determined. When the pressure further increases and exceeds the set value β, the compressor 1 is stopped.

  At this time, the temperature D of the incoming water temperature detecting means 10 and the temperature E of the hot water temperature detecting means 11 are stored and determined. When the pressure is suppressed and falls below the set value α ′, the control returns to the control of the pump 7 at the normal set hot water temperature, and the timer, temperature D and E stored values are reset.

  When the temperatures D and E are determined, the compressor 1 is stopped, and when the temperature ED becomes lower than the set value F, the number of rotations of the pump 7 is increased to increase the heat exchange amount 2 of the hot water supply 2 and Since the detection temperature of the temperature detection means 11 can be reduced to be equal to the detection temperature of the incoming water temperature detection means 10, it is determined that there is no abnormality in the circulation system for circulating the liquid in the hot water tank 6 through the liquid pipe 8. Displays heat pump cycle abnormality.

  If the set value F is equal to or greater than the set value F, the amount of heat exchange in the hot water supply heat exchanger 2 has not been increased despite the increase in the number of rotations of the pump 7, so that the liquid in the hot water tank 6 is circulated through the liquid pipe 8. Displayed as abnormal circulation system.

  FIG. 6 shows a high pressure suppression operation / abnormality detection chart of the heat pump type water heater. In addition to the pressure β condition, the temperature detected by the discharge temperature detecting means 12 may be a predetermined value X or more. Anomaly detection operating condition.

  As described above, the heat pump water heater of the present invention is suitable for an apparatus having, for example, a bathtub hot water supply function, a heating function, and a drying function in addition to the hot water supply function.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Heat exchanger for hot water supply 3 Depressurizer 4 Heat exchanger for heat source 5 Refrigerant piping 6 Hot water storage tank 7 Pump 8 Liquid piping 9 High pressure detecting means 10 Incoming water temperature detecting means 11 Hot water temperature detecting means 12 Discharge temperature detecting means 12

Claims (3)

A heat pump cycle formed by connecting a compressor, a hot water heat exchanger, a decompressor, and a heat source heat exchanger with refrigerant piping;
A hot water tank for storing liquid for hot water supply,
Liquid piping in which the liquid in the hot water tank circulates through the hot water supply heat exchanger;
A pump for circulating the liquid in the liquid pipe;
High-pressure detection means for detecting a high-pressure side pressure in the refrigerant pipe ;
Tapping temperature detecting means for detecting tapping temperature of the heat exchanger for hot water supply;
A control device ,
When the high pressure side pressure in the refrigerant pipe reaches a first predetermined value, the control device increases the rotation speed of the pump and increases the rotation speed of the pump, and then the high pressure after a predetermined time has elapsed. If the side pressure exceeds a second predetermined value higher than the first predetermined value, the compressor is stopped;
When the compressor is stopped, the control device increases the tapping temperature A when the high pressure side pressure reaches the first predetermined value and the rotational speed of the pump, after a predetermined time has elapsed. It is determined that the heat pump cycle is abnormal when the difference from the tapping temperature B is greater than or equal to a predetermined value, and when the difference is less than the predetermined value, it is abnormal in the path through which the liquid circulates. heat pump water heater characterized that you determination. A heat pump cycle formed by connecting a compressor, a hot water heat exchanger, a decompressor, and a heat source heat exchanger with refrigerant piping;
A hot water tank for storing liquid for hot water supply,
Liquid piping in which the liquid in the hot water tank circulates through the hot water supply heat exchanger;
A pump for circulating the liquid in the liquid pipe;
High-pressure detection means for detecting a high-pressure side pressure in the refrigerant pipe;
Hot water temperature detection means for detecting the incoming water temperature of the heat exchanger for hot water supply ,
Inlet water temperature detecting means for detecting the hot water temperature of the hot water supply heat exchanger ;
A control device,
When the high pressure side pressure in the refrigerant pipe reaches a first predetermined value, the control device increases the rotation speed of the pump and increases the rotation speed of the pump, and then the high pressure after a predetermined time has elapsed.
If the side pressure exceeds a second predetermined value higher than the first predetermined value, the compressor is stopped;
The control device, when the compressor is stopped, when the difference between the incoming water temperature and the hot water temperature is not more than a predetermined value after a predetermined time has elapsed after increasing the rotational speed of the pump. wherein determining that the abnormality of the heat pump cycle, heat pump water heater, wherein the liquid is determine the constant to be abnormal in the path of circulation in the case where the difference exceeds a predetermined value. A discharge temperature detecting means for detecting a discharge temperature of the refrigerant discharged from the compressor;
When the high-pressure side pressure in the refrigerant pipe reaches a first predetermined value, the control device increases the number of revolutions of the pump, and increases the number of revolutions of the pump. The heat pump hot water supply device according to claim 1 or 2 , wherein the compressor is stopped when the temperature exceeds a third predetermined value .

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