JPS60250A - Heat pump type hot-water supplying machine - Google Patents

Abstract

PURPOSE:To control heat-up temperature automatically and make temperature level variable by a method wherein the operation and stop of the heat pump is regulated by a high pressure by utilizing the high pressure detecting sensor of the heat pump and the water temperature detecting sensor in a hot-water reserving tank. CONSTITUTION:The high pressure detecting sensor 12, provided with a sensible element, is capable of changing the set pressure value thereof by an electric signal while the water temperature detecting sensor 13 is opened at first set temperature, lower than the lowest value of the heat-up temperature of hot- water obtained when the pump is stopped by the sensor 12 and is closed at a further lower set temperature. A volume 19 is adjusted to the highest pressure, a contact 21 is closed when a switch 17 is put ON and the high pressure is lower than the set value, the contacts 13', 15, 16 are closed when the water temperature in the tank 6 is low, the operation of the pump is begun and the operation of the pump is stopped when the water temperature in the tank 6 is increased. Thus, the efficiency of the pump may be improved and the heat emitting loss thereof may be reduced by setting the heat-up temperature of the hot-water at a lower temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the operation control of a P1 pump water heater.

Conventional configuration and its problems Conventionally, the operation control of the heat pump of a heat pump water heater that raises the temperature of water in a hot water storage tank using the condensed heat of the heat pump is
As shown in the figure, when the water temperature reaches a predetermined value or higher based on the signal from the water temperature detection sensor 7 in the hot water storage tank 6, the heat pump is stopped.
In a system in which the heat pump is restarted when the water temperature falls below a predetermined value, or in a system in which the water in the hot water storage tank 6 is forcibly circulated to the condenser 2' by a circulation pump 8 as shown in FIG. 2, a sensor 7' detects the volume of circulating water. There are methods to turn the heat pump on and off based on the signal.

In the above-mentioned conventional control method using water temperature detection, the set temperature is generally fixed, and when the evaporator 4 is an air heat source, the high pressure of the heat pump increases when the outside temperature is high, so the set temperature is set at the highest outside temperature in summer. The temperature is determined according to the high pressure that occurs when the temperature is high, and even when high-temperature water is required in the winter, it will only boil up to the temperature set for the summer.

If you want to change the set boiling temperature as needed, you can use multiple temperature detection sensors with different set temperatures and switch between them, or use a thermistor to adjust the volume as necessary. There was also the problem of having to set the temperature each time.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks.It takes advantage of the heat pump characteristics and uses simple control to lower the boiling temperature in the summer when the hot water supply load is low, and to lower the boiling temperature in the winter when the hot water supply load is high. The present invention provides a control system that not only automatically controls the boiling temperature as the temperature increases, but also allows the temperature level to be varied as necessary.

Structure of the Invention In order to achieve this object, the present invention aims to stop the operation of a heat pump water heater that heats water in a hot water storage tank using the condensation heat of the heat pump condenser, which consists of a compressor, a condenser, a throttle mechanism, and an evaporator. A heat pump high pressure detection sensor is provided to regulate the heat pump, and a water temperature detection sensor in the hot water storage screw is provided to regulate the restart of operation. It is regulated by pressure, so it will automatically boil to a high temperature when the outside temperature is low in the winter, when a high water temperature is required, and automatically lower the temperature when the outside temperature is high in the summer, when a relatively low water temperature is sufficient. When a lower water temperature is sufficient in both winter and summer, the boiling water temperature can be set as necessary by changing the setting value of the high-pressure pressure detection sensor using an electrical signal from the volume.

Furthermore, since the heat pump is regulated to stop operating under high pressure, it also ensures the safety of the heat pump cycle.

Description of examples An embodiment of the present invention will be described using FIGS. 3 to 6.

FIG. 3 shows an example of the system configuration, in which 1 is a compressor;
2 is a condenser, 3 is a throttle mechanism, 4-piece evaporator, 6 is evaporator 4
The heat pump is made up of more than just a blower.

The condenser 2 is buried in the lower part of the hot water storage tank 6 with a flange 11. 13 is a water temperature detection sensor in the hot water storage tank 6, which is attached to the flange 11. 12 is a high-pressure pressure detection sensor, 9 is a water supply pipe for the hot water storage tank 6, and 10 is a hot water tap.

The high-pressure pressure detection sensor 12 is a sensor having a pressure-sensitive element such as one whose electrical resistance value changes when the pressure changes or one which generates a potential difference, and is configured to be able to vary the set pressure value by an electrical signal. Also, water temperature detection sensor 1
3 is a high-pressure pressure detection sensor 12 that stops the heat pump 1-
The device is configured to open at a first set temperature, which is lower than the lowest value of the boiling water waterfall obtained when the boiling water falls, and to close at a second set temperature, which is also lower than the first set temperature. Fig. 4 shows an embodiment of the basic control circuit of the heat pump according to the present invention, in which 1' is a compressor, 6' is a blower, 13' is a water temperature detection sensor contact, 12-pin high pressure pressure detection sensor, and 18 is a high-pressure pressure sensor. In the setting control circuit section, the high pressure setting value is determined by the volume 19, and when the high pressure reaches the set value, the first relay 20 is de-energized and the contacts 21 are opened. A second relay 14 is connected in series with the water temperature detection sensor contact 13' and the contact 21. Reference numeral 16 denotes a positive contact point of the second relay 14, which is connected so that when the second relay 14 is energized, the compressor 1' and the blower 6' are energized and the heat pump is operated.

16 is the positive contact of the relay 14 and the water temperature detection sensor contact 13'
are connected in parallel. 17 is a main switch. FIG. 6 is a graph when the high pressure of the heat pump is used as an outside air temperature parameter with respect to the water temperature around the condenser 2 of the heat pump (that is, the water temperature in the hot water tank e).

The effect will be explained in more detail. Normal volume 19
The high pressure setting is adjusted so that the maximum pH is 1.
(The high pressure value at this time is within the safe operation limit of the Mineral heat pump cycle.) When the main switch 17 is turned on, the high pressure is below the set value, the first relay 20 is energized, and the contact 21 is closed. Further, when the water temperature in the hot water storage tank 6 is low, the water temperature detection sensor contact 13' is closed, the second relay 14 is energized, and the contact 15. f6 is closed, the compressor 1' and the blower 6' are energized, and the heat pump operation starts.

When the water temperature in the hot water storage tank 6 rises from 1 to the high first set temperature of the water temperature detection sensor 13, the contact 13' opens, but since the contact 16 is closed, the heat pump operation continues.
Further, as the water temperature in the hot water storage tank 6 rises, the high pressure of the heat pump rises, and when the set pressure is reached, the control circuit section 18 stops energizing the first relay 20, and the contact 21 opens. 2 relay 14 is also stopped and contacts 16° 16 are opened, causing compressor 1' and blower 6
At this time, as shown in Fig. 6, the high pressure setting value PH1 is set constant, so when the outside air temperature Ta is low in winter, the high temperature Tw1 is reached, and in summer the outside air temperature Ta is low. When the temperature is high, the temperature will rise to TW2, which is lower than in winter. After the heat pump operation is stopped, the high pressure of the heat pump decreases, and the first relay 20 is activated by the control circuit section 18.
energization is resumed and the contact 21 is closed, but the water temperature detection sensor contact 13' is open, so the heat pump remains in a stopped state.When hot water is supplied through the hot water tap 10, the temperature is lower than that of the water supply pipe 9 at the bottom of the hot water storage tank 6. When water is supplied and the temperature of the flange 11 where the water temperature detection sensor 13 is installed decreases to the lower set temperature of the water temperature detection sensor 13, the contact 13' is closed and the second relay 14 is energized, and the heat pump is activated. operation will be resumed.

On the other hand, if the hot water tank 6 is left unused for a long time without hot water supply, the temperature of the hot water in the hot water storage tank 6 will drop due to natural heat radiation, and when the water temperature detection sensor 13 detects a low set temperature, the above-mentioned heat pump operation will be restarted. At this time, the water temperature detection sensor 13 is installed on the flange 11 and detects a temperature lower than the water temperature in the hot water tank 6 due to the influence of the surrounding outside air temperature. That is, when the outside air temperature is low in winter, the heat pump is restarted at a point in time when the water temperature in the hot water storage tank 6 is higher than when the outside air temperature is high in summer.

In addition, if the high pressure setting value is set to a low value using the volume 19, for example, PH2 in Fig. 6, the hot water temperature in the hot water storage tank 6 will be as low as TvV3 in the summer, and the temperature will not rise to high temperatures unnecessarily. This has the effect of increasing the efficiency of the heat pump and reducing heat loss.

As mentioned above, when there is a heavy hot water supply load in winter, the temperature and storage temperature can be set high, and when there is a low hot water supply load in summer, the temperature will automatically rise to a relatively low temperature, so it is no longer necessary to adjust the set temperature each time as in the past. do not. In addition, when the hot water supply load is low in both winter and summer, it is possible to set an even lower part heating temperature by adjusting the volume 19. By lowering the part heating water temperature, not only does the efficiency of the heat pump increase, but the heat radiation loss is also reduced. It has the effect of

In the above embodiment, the condenser was buried in the lower part of the hot water storage tank, but the forced circulation type configuration as shown in Figure 2 is used, and the installation of the water temperature detection sensor is not affected by the temperature of the surrounding outside air. It is clear that similar effects can be obtained by doing so.

Effect of the invention According to the invention, there is a compressor, a condenser, and a throttling mechanism.

A heat pump water heater that heats water in a hot water storage tank using the condensation heat of a heat pump consisting of an evaporator has a high pressure sensor for the heat pump and a sensor for detecting water temperature in the hot water tank, and the heat pump operation is stopped by detecting the high pressure. By controlling the heat pump to restart by detecting the water temperature in the hot water storage tank, the heat pump is regulated with high pressure when it stops operating, so the hot water is heated at a high temperature when the hot water supply load is high in the winter, and relatively low temperature when the hot water supply load is low in the summer. Since the water temperature is raised at the upper part, there is no need to adjust the water temperature set at the upper part in summer and winter.

Furthermore, since the heat pump is stopped using high pressure, the heat pump is always stopped at high pressure regardless of changes in water temperature or outside temperature, which has an important effect on ensuring the safety of the heat pump cycle. be.

In addition, by using electrical signals to vary the high pressure setting value as necessary, it is possible to freely select, even at the same time, to raise the high temperature section when the hot water supply load is high, or to raise the low temperature section with high efficiency when the hot water supply load is low.

[Brief explanation of drawings]

Figures 1 and 2 are configuration diagrams of conventional heat pump water heaters.
FIG. 3 is a block diagram of a heat pump water heater according to an embodiment of the present invention, FIG. 4 is a circuit diagram of the control circuit, and FIG. 6 is a characteristic diagram of water temperature and high pressure. 1... Compressor, 2... Condenser, 3...
... Throttle mechanism, 4... Evaporator, 6...
...Hot water tank, 12...High pressure detection sensor, 1
3...Water temperature sensor in the hot water tank, 18...
Control circuit section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4

Claims (1)

[Claims] A heat pump high-pressure pressure detection sensor that regulates the shutdown of a heat pump water heater that heats water in a hot water storage tank using the heat of condensation of a heat pump condenser consisting of a compressor, a condenser, a throttle mechanism, and an evaporator; A heat pump water heater is provided with a sensor for detecting water temperature in a hot water storage tank to regulate restart of operation, and the high pressure sensor is configured to vary a set pressure value based on an electric signal.