JPS58140553A - Warm water apparatus - Google Patents

Abstract

PURPOSE:To perform heat pump operation for secondary heating economically, when the water temperature in a hot water storing tank is low, by circulating the water in a heating device for a specified time, and thereafter controlling a second heating device in correspondence with the temperature of the circulating water. CONSTITUTION:The water temperature in the hot water storing tank 1 having a heating body 16 is detected by a boiling-up detecting sensor 14. When the temperature is lower than the specified water temperature, a pump 3 for a circulating path 6 from an outlet port 2 at the lower part of the hot water storing tank 1 to an inlet port 5 at the upper part through a pump 3 and a heat exchanger 4 is operated for a specified period based on the timer control. Then, the temperature of the returned water is detected by a returned water temperature sensor 13. When the temperature is lower than the specified water temperature, the compressor 9 of a heat pump heat source 11 as a heat source for the heat exchanger and a fan 12 are operated, and the secondary heating is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater that stores hot water using late-night electricity or the like and is equipped with an economical auxiliary heating device in addition to the heating device in the hot water storage tank.

Conventionally, for example, in an electric water heater equipped with a heat pump heat source device, the hot water in the hot water tank is used at will by the user, and depending on changes in daily living patterns, the amount of hot water used may be extremely small. be.

On the other hand, determining whether or not the heat bonop can be operated is determined by the return water temperature detection sensor 13, which is provided inside the outer case 18 and is provided in a narrow place with little heat capacity, such as the circulation path e. Therefore, this sensor 13 detects the water temperature, but when the outside temperature is high such as in summer, it may receive the temperature of the outside air and also receive conductive heat from the tank 1, and when the amount of hot water used is small, it may receive the conduction heat from the bottom of the tank 1. Although there is low-temperature water in the tank, the sensor 13 mistakenly recognizes the temperature as being 35C or higher, and energizes the heating element 16 without operating the heat pump.1. In reality, the heat pump does not operate economically even though it is in a state where it can be operated. In fact, according to the inspection, the outside temperature is 31C9 and the water temperature is 2C.
When the temperature is 8C, the hot water in the hot water storage tank 1 is 100! When I used it, I found that the heat pump would not operate the next time I turned on the power. This phenomenon occurs from summer to mid-season, and has the disadvantage that it cannot be operated economically for a long period of time depending on the household using it.

The present invention solves the above-mentioned conventional drawbacks, and aims to promote economical operation by accurately controlling the operation of other heat source equipment according to the hot water supply load.

In order to achieve the above object, the hot water device of the present invention includes a hot water storage tank, a heating device provided in the hot water storage tank, a circulation pump provided in a circulation path attached to the hot water storage tank, and a circulation pump provided in the circulation path attached to the hot water storage tank. another heating device for heating the water, a means for detecting the water temperature in the hot water storage tank, and a means for detecting the circulating water in the circulation path before being heated by the other heating device; When the water temperature in the hot water storage tank has not reached a predetermined temperature, a timer is installed to operate the circulation pump for a certain period of time based on a signal from the circulating water detecting means. The configuration is such that the output Wt of the heating device is controlled, and the operation is highly economical.

An embodiment of the present invention will be described below based on the drawings.

As shown in FIG. 1, the water heater has a water outlet 2 at the bottom of a hot water storage tank 1. Circulation pump 3. A circulation path 6 is formed which connects the heat exchanger 4° and the inlet 6 at the upper part of the hot water storage tank 1. Furthermore, the hot water device includes a heat exchanger 4, an expansion valve 7.・Evaporator 8. A heat pump heat source &11'e forming a heat pump cycle path 10 communicating with the compressor 9 is provided as a separate heating device. A 77 tank 12 is provided near the evaporator 8 to introduce outside air. 13 is a return water temperature detection sensor that controls the operation of the heat pump heat source device 11.

14 is a boiling temperature detection sensor; 15 is a timer device that issues an ON signal to operate the circulation pump 3 for a certain period of time in response to a signal from the return water temperature detection sensor 13; 16 is a heating element provided in the hot water storage tank 1; I'm here. Reference numeral 17 denotes a variable resistor for arbitrarily variably setting the boiling temperature. 18 is an outer case that houses the hot water storage tank 1 and the like.

The heat pump heat source device 11 absorbs heat from the outside air, exchanges the heat with the heat exchanger 4, and converts water in the circulation path 6 into rock. In this embodiment, the efficiency is set to C0P3.5 or higher. In other words, for example, the water in the hot water storage tank 1 with a capacity of 370ρ is first heated to a predetermined temperature of about 5 using only the heat pump heat source device 11.
Boil to 5U. The required time is approximately 3 hours or less with an input of 1300W, and the energy saving effect is extremely high compared to a general heating wire type electric water heater.

After the heat pump heat source device 11 is stopped, heating is switched to heating by the heating element 16, and heating is continued to a higher set temperature of 86C.

In this way, this hot water system operates the heat pump heat source device 11 preferentially during the 8-hour late-night power supply zone, and
C, then energize the heating element 16 as necessary,
This configuration saves expensive power and reduces running costs.

66-di The operation of the above configuration will be explained below.

In Fig. 2, when the midnight power supply zone is reached and the 2.00V power supply is turned on and the water temperature detected by the boiling detection sensor 14 is below the set temperature 660, the boiling detection sensor 14 indicates that the water has not boiled to the predetermined temperature. This output signal is input to the boiling detection section 19.

Then, the Tyee device 15 is turned on, the relay 20 is turned on, and the normally closed contact 21 is also turned on.

At this time, the heating element 6 is still in the stopped state until '1'.

Water in the hot water storage tank 1 circulates within the circulation path 6 as the circulation boiler 3 operates, and the return water temperature detection sensor 13 detects the temperature of the circulating water. When the timer device 16 is turned off, the normally closed contact 21 of the relay 20 is closed and the load contact 23 is closed. When the normally closed contact 21 is closed, the relay 24 is energized and its load contact 26 is also closed. At this time, if the water temperature detected by the return water temperature detection sensor 13 is below 36C, it is determined that it is necessary to operate the heat pump heat source device 11, and the heat pump heat source device 11 is started to operate. That is, the boiling temperature detection zero level sensor 14 outputs a forward signal to the relay 24, and the return water flooding detection sensor 13 outputs a forward signal to the relay 26, respectively. Therefore relay 27. A load contact 28 of a relay 26 connected in series to the compressors 9, 7 and the unmotor 10 is closed, and a contact 29 connected to the load contact 28 is opened. Furthermore, current flows through the relay 27, and the load contact 22 of the relay 27, which is connected in parallel to the 10 OV power supply, is also closed. The circulation pump 3 continues the circulation, while the heat pump heat source device 11 circulates the heat medium in the direction of arrow G in FIG. 1, and exchanges heat with the circulating water in the heat exchanger 4.

The heated circulating water flows into the hot water storage tank 1 through the inlet 6, and the heat pump heat source device 11 operates until the temperature of the total amount of hot water in the tank reaches the set temperature of 56U. When the return water temperature detection sensor 13 installed in the circulation path 6 detects that the temperature is 35U or higher, the load contact 28 of the relay 26 and the relay 2
7 becomes an open circuit, the heat pump heat source device 11 stops, and the circulation pump 3 also stops. On the other hand, only the contact 29 becomes a closed circuit due to the connecting point action, and the heating element 16
The hot water in the hot water storage tank 1 is further heated to a hot water temperature set by the user. For example, if the user is 8
If the temperature is set to 50, the contact 26 of the relay 24 will be opened by the output signal of the boiling temperature detection sensor 14 when the water has been boiled to this temperature, and the current supply to the heating element 16 will be stopped. The raising is complete.

The above operation is performed when the 200V power supply is turned on, when the detection value of 1°4 is below ssr, and when the return water temperature after the timer device 16 has finished operating is below 36C. As explained in the example, the boiling detection temperature is 55 C-1
Even if the temperature is above m, if the return water temperature is below 35C, the same operation is performed. However, the boiling detection temperature is 55U or more, and the returning water temperature is 35U after the timer device 16 is activated.
When U or higher, the heating element 16 suddenly energizes n.

The heat pump heat source device 11 becomes inoperative.

As described above, according to the present invention, the return water temperature detection sensor 13 effectively detects the temperature of the passing water after the operation of the circulation pump 3 is completed, so that the amount of hot water used by the user increases or decreases as in the conventional case. The heat pump can be operated timely and accurately to accurately detect water a+ without causing erroneous judgments due to changes in temperature or outside temperature. As a result, it is possible to provide the most economical energy-saving operating conditions throughout the year.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention. Water capacity diagram, 2nd
The figure is a control circuit diagram of the generator. 1...Hot water storage tank, 3...Circulation pump, 4
...Heat exchanger, 6...Circulation path, 11...
... Heat pump heat source equipment (other heating devices), 13.
... Return water temperature detection sensor, 14 ... Boiling temperature detection sensor, 16 ... Timer device, 1
6o...Heating element (heating device).

Claims (2)

[Claims] (1) a hot water storage tank, a heating device provided in the hot water storage tank, a circulation pump provided in a circulation path attached to the hot water storage tank, and another heating device that heats water in the circulation path; means for detecting water in the hot water storage tank; means for detecting circulating water in the circulation path before being heated by the other heating device; and a timer device that operates the circulation pump for a certain period of time in response to a signal from the means for detecting the circulating water when the circulating water is not present, and the other heating device is operated in response to the signal from the means for detecting the circulating water after the operation of the timer device is completed. A hot water device configured to control the start and stop of the water. (2) The invention according to claim 1, which uses an electric heater device that uses late-night electricity as the heating device installed in the hot water storage tank, and uses a heat pump heat source device as the other heating device. Hot water equipment.