JPS60142157A - Hot-water supplier utilizing solar heat - Google Patents

Abstract

PURPOSE:To improve the stability and convenience of using of the titled device by a constitution wherein a refrigerating cycle circuit is switched into a refrigerant circulating pump circuit after a compressor or a refrigerant circulating pump is operated for a given time period upon switching. CONSTITUTION:In case the refrigerating cycle circuit, consisting of a compressor 2, a heat exchanger 3, an expansion valve 5 and an evaporator 1, is switched to the refrigerant circulating pump circuit, consisting of the refrigerant circulating pump 7, the evaporator 1 and the heat exchanger 3, an electric three-way valve 6-1, provided at the outlet of the heat exchanger 3, is closed at first. Thereafter, the compressor 2 or the refrigerant circulating pump 7 is operated for about 1 min by a delay timer to retrieve the refrigerant in the refrigerating cycle into the heat exchanger 3, then, the circuit is switched by the electric three-way valves 6-1, 6-2. Thus, the refrigerant in the refrigerating cycle can be retrieved once into the heat exchanger 3, therefore, the deterioration of capacity due to the shortage of refrigerant or excessive charging of the same may be eliminated, the stable performance of the device may be maintained and an energy saving operation may be effected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar water heater that boils water by absorbing solar heat and atmospheric heat through the operation of a refrigeration cycle.

Conventional example (+14 formation and its problems) A conventional example will be described below with reference to the drawings.

The refrigerant that has absorbed heat from the sun and the atmosphere in the evaporator 1 shown in the figure is pressurized at high temperature in the compressor 2, and is exchanged with water in the heat storage tank 4 in the heat exchanger 3 to boil water. In the refrigeration cycle, when there is solar radiation, the electric three-way valve 6-1.
At step 6-2, the route is changed to the bypass path, and the compressor 2 operation is switched to the refrigerant circulation pump 7 operation as shown by the broken line arrow, and the solar radiation is absorbed by the low capacity electric power, and when the solar radiation decreases (11). - The bypass path was returned to its original position using the three-way valves 6-1 and 6-2 as shown by the solid arrows, and the operation of the refrigerant circulation pump 7 was switched to the operation of the compressor 2 to absorb atmospheric heat. In this case, the two electric three-way valves 6-1, 6-2, the compressor 2, and the refrigerant circulation pump 7 were being switched at the same time, so when switching the circuits, the operation of the refrigeration cycle was temporarily stopped and the refrigeration cycle After balancing the amount and pressure of refrigerant in the tank, operation had to be restarted, and the balancing time required more than 30 minutes. In addition, the balance of refrigerant amount and pressure within the refrigeration cycle is extremely unstable due to the influence of outside air temperature, water supply temperature, etc., and switching the circuit may cause an insufficient amount of refrigerant or overfilling, making it extremely difficult to maintain stable performance. Troubled) 1 [was. In addition, the compressor 2 and the refrigerant U6 ring pump 7 are subjected to heavy burdens due to the refrigeration cycle due to lack of refrigerant or overfilling, which shortens the life of the equipment.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a water heater having a refrigeration cycle with improved stability and ease of use.

Structure of the Invention In order to achieve the above object, the structure of the present invention includes a refrigeration cycle in which a compressor, a heat exchanger, an expansion valve, and an evaporator are connected in the order of passage.
A bypass path is provided in parallel with an electric three-way valve on the secondary side of the compressor and expansion valve, and by switching the electric three-way valve mJ, the air can be removed from the compressor, heat exchanger, expansion valve, and evaporator. The refrigeration cycle circuit is configured such that it can be switched to a refrigerant circulation pump circuit consisting of a refrigerant circulation pump, an evaporator, and a heat exchanger, and when switching between the two types of circuits,
Only the electric three-way valve at the outlet of the heat exchanger is closed and the others are fully open, and after operating the compressor or refrigerant circulation pump for a certain period of time, the circuit is switched to either circuit as set.

By setting the above Ml+ composition, the refrigerant in the refrigeration cycle can be temporarily recovered into the heat exchanger when switching circuits, so the refrigerant conditions in the refrigeration cycle remain constant, preventing refrigerant shortage or overfilling. It is possible to maintain a stable refrigeration cycle at all times and perform energy-saving operation. In addition, the compressor and refrigeration circulation pump are not burdened by the refrigeration cycle due to lack of refrigerant or overfilling, and the time required for circuit switching is significantly shortened and usability is improved. It is.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is an evaporator that absorbs heat from the sun and the atmosphere and converts the refrigerant into gas, and 2 is a compressor that pressurizes the refrigerant that has been converted into gas in the evaporator 1 at a high temperature.

3 is a heat exchanger that exchanges the heat of the refrigerant pressurized at high temperature by the compressor 2 with circulating water; 4 is a heat exchanger; and 4 is a heat storage tank that stores the water heated by 3.

5 is an expansion valve that expands the refrigerant that has been heated in the heat exchanger 3;

6-1 is an electric three-way valve provided at the outlet of the heat exchanger 3 that operates first, and 6-2 is an electric three-way valve that operates after the electric three-way valve 6-1 operates.

Reference numeral 7 designates a refrigerant circulation pump provided in a bypass path on the side of the expansion valve 5 which is closed by the electric three-way valves 6-1 and 6-2. Although not shown, the compressor 2, refrigerant circulation pump 7, and electric three-way valve 6-1, 6-2 are electrically connected via a delay timer (not shown), and switching can be done either automatically or manually. Allow.

The effects of the above configuration will be explained below.

When switching from a refrigeration cycle circuit consisting of a compressor 2, heat exchanger 3, expansion valve 5, and evaporator 1 to a refrigerant circulation pump circuit consisting of a refrigerant circulation pump 7, evaporator 1, and heat exchanger 3 (and vice versa) Similarly), the electric three-way valve 6-1 provided at the outlet of the heat exchanger 3 is first closed. (In that case, the compressor 2 or the refrigerant circulation pump 7 is in an operating state.

) After that, the compressor 2 or the refrigerant circulation cylinder 7°7 is operated by a delay timer (not shown) for about 1 minute, and the heat exchanger 3 is activated.
After recovering the refrigerant in the refrigeration cycle, the electric three-way valve 6
-1.6-2 switches between the two types of circuits.

In this way, according to this embodiment, the refrigerant in the refrigeration cycle can be recovered once into the heat exchanger 3, so the refrigerant conditions before and after switching are always constant, and the capacity decreases due to refrigerant shortage or overfilling. It maintains stable performance and can perform energy-saving operation. Further, the compressor 2 and the refrigerant circulation pump 7 are not burdened by the sagging of the refrigeration cycle, and the life of the equipment can be maintained for a long time. Furthermore, the time required for circuit switching can be significantly shortened, the switching timing will not be missed, and energy saving and usability will be improved.

Effects of the Invention As described above, according to the present invention, the following effects can be achieved.

(1) There is no sagging of frozen cycles due to circuit switching, and stable performance can always be maintained.

(2) There is no burden on the compressor, refrigerant circulation pump, etc. due to refrigerant shortage or overfilling, and the life of the equipment can be maintained for a long time.

(3) The time required for circuit switching is short (for example, about 1 minute) (previously it took more than 30 minutes), and there is no need to miss the switching timing, which improves energy efficiency and ease of use. do.

[Brief explanation of the drawing]

The figure is a system diagram of one embodiment of the present invention. 1...Evaporator, 2...Compressor, 3...
...Heat exchanger, 4...Heat storage) IH, 5...
・Expansion valve 1.6-1.6-2...Electric three-way valve, 7
...Refrigerant circulation pump.

Claims (1)

[Claims] It has a refrigeration cycle in which a compressor, a heat exchanger, an expansion valve, and an evaporator are connected in the same order, and a bypass path is provided between them using an electric three-way valve on the secondary side of the compressor and expansion -J+. By switching the electric three-way brake r, a refrigeration cycle circuit consisting of a compressor, a heat exchanger, an expansion valve, and an 8K evaporator can be switched to a refrigerant circulation pump circuit consisting of a refrigerant circulation pump, an evaporator, and a heat exchanger. At the same time, when switching between the two circuits, only the electric three-way valve of the heat exchanger is closed and the others are fully open, and after operating the compressor or refrigerant circulation pump for a certain period of time, the setting is made. A 114-inch solar water heater that can be switched to either circuit.