JPS60155860A - Solar water heater - Google Patents

Abstract

PURPOSE:To prevent the fluctuation of low pressure, generated by a pressure loss at the side of the low pressure, from bein delivered to the lower part of a diaphragm for an external pressure equilibrium system temperature type expansion valve through an external pressure equilibrium pipe by a method wherein the external pressure equilibrium system temperature type expansion valve for the solar heat-utilizing water heater is provided with a choking mechanism in the external pressure equilibrium pipe. CONSTITUTION:Refrigerant gas, compressed by a compressor 3, flows into a condenser 4 to heat low-temperature water sent by a circulating pump 11 and accumulate it in a heat accumulating tank 12. On the other hand, the refrigerant, whose condensing heat is deprived, flows into the external pressure equilibrium system temperature type expansion valve 5 and the pressure thereof is reduced, then, is returned to the compressor 3 through a heat collector 1 and an accumulator 2. When water temperature is increased and condensing pressure has increased, the pressure loss in the low pressure side is increased, the fluctuation of low pressure is delivered to the lower part of the diaphragm for the expansion valve 5 even though the temperature of a temperature sensing tube 7 is stabilized and hunting, regardless of the temperature of the temperature sensing tube, is generated, however, the width of low pressure fluctuation is reduced by the choking mechanism 13 arranged in the external pressure equilibrium pipe 6 and a stabilized low pressure is delivered to the lower part of the diaphragm, therefore, the hunting may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar water heater comprising a heat collecting circuit that collects solar heat and atmospheric heat, and a hot water heating circuit that uses the collected heat to raise the temperature of water. It is.

Construction of a conventional example and its problems 2-barcoin A conventional example of this type of solar water heater will be described with reference to FIG. 1 is a heat collector that evaporates the refrigerant using solar heat and air heat, 2 is an accumulator, 3 is a compressor, 4 is a heat exchanger that radiates heat of condensation of the refrigerant, 5 external pressure equalization type thermostatic expansion valves, 6 is an external 7 is a temperature-sensitive cylinder, 8.9 is a connecting pipe, and the above-mentioned 1 to 9 constitute a heat collecting circuit. Furthermore, 10 is a heat exchanger that exchanges heat with the condenser 4, 11 is a circulation pump, and 12 heat storage tanks, and 10 to 12 constitute a hot water heating circuit, which together with the heat collecting circuit. It constitutes a solar water heater. 2. The heat collector 1 of a solar water heater is generally installed on the roof, and the connecting pipe 8.9 needs to be about 10 to 15 m long, but in that case, the water temperature in the heat storage tank is -F. As it rises, the pipe 9 to the collector 1
The pressure loss of the external pressure-equalizing type temperature-type expansion valve 5 increases, and the pressure loss of the low-pressure side piping increases. Therefore, regardless of the temperature of the temperature-sensing tube 7, hunting occurs due to pressure fluctuations in the external equalizing tube 6.
As a result, there is a drawback that the reliability of the motor is reduced due to current changes in the diaphragm of the external pressure-equalizing temperature-type expansion valve and the compressor 3. Unfortunately, due to the low pressure drop of the connecting piping, if the diameter of the connecting piping was increased, the amount of refrigerant charged in the system would be greater than the allowable charging amount of the compressor.

Furthermore, if you change the external pressure-equalizing type temperature-type expansion valve to an internal pressure-equalizing type, there will be no external equalizing tube, so the
・If the water temperature goes up by 1 or the water temperature increases and the pressure loss on the low pressure side increases, the heating capacity decreases and the operating efficiency decreases.

OBJECTS OF THE INVENTION The present invention is intended to solve the above-mentioned problems of the prior art, and to reduce the operating efficiency of the system by suppressing the non-nching of the external pressure-equalizing temperature-type expansion valve, which is unrelated to the temperature-sensing tube temperature, and which is caused by an increase in pressure loss on the low-pressure side. The purpose of this is to improve the reliability of compressors and thermostatic expansion valves.

Structure of the Invention To achieve this object, the present invention provides a heat collection circuit comprising a heat collector, an accumulator, a compressor, a condenser, and an external pressure-equalizing thermostatic expansion valve, and a heat exchanger for exchanging heat with the condenser; A throttling mechanism is provided in the outer equalizing tube of the external pressure equalizing temperature type expansion valve of a solar water heater consisting of a hot water heating circuit consisting of a circulation pump and a heat storage tank. With this configuration, low pressure fluctuations caused by pressure loss on the low pressure side are passed through the outer equalization pipe,
Prevents pressure from being transmitted to the lower part of the diaphragm of an external pressure-equalizing temperature-type expansion valve.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Note that the same parts as in FIG. 1 are given the same numbers. 1 is a heat collector that evaporates the refrigerant using solar heat and atmospheric heat, 2 is an accumulator, 3 is a compressor, 4 is a condenser that condenses the refrigerant, 5 is an external pressure equalization thermostatic expansion valve, 6 is an external equalization pipe, 7 Reference numeral 8.9 indicates a temperature-sensitive tube, 8.9 indicates a connecting pipe, 13 indicates a throttle mechanism disposed in the outer tube 6, and 1 to 9 and 13 constitute a heat collecting circuit. Further, 10 is a heat exchanger that absorbs heat released from the refrigerant from the condenser 4, 11 is a circulation pump, and 12 is a heat storage tank. Note that 10 to 12 constitute a hot water heating circuit, which together with the heat collecting circuit constitutes a water heater for solar heating.

Next, the operation of the solar water heater having the configuration described below will be explained.

The high-temperature, high-pressure refrigerant gas compressed by the compressor 3 flows into the condenser 4, and the heat of condensation causes the circulation pump 1 of the hot water heating circuit to flow into the condenser 4.
The low-temperature water sent in step 1 is heated and raised to a temperature of 1 to 1.
Store in 2. On the other hand, the refrigerant that has been liquefied by being deprived of condensation heat flows into the external pressure-equalizing temperature-type expansion valve 5, is depressurized, flows into the collector 1, absorbs solar heat and atmospheric heat, evaporates into gas, passes through the accumulator 2, and compresses the compressor 3. Return to In the above action,
As the water temperature rises and the condensing pressure increases, the pressure loss on the low pressure side increases, and even if the refrigerant sucked into the compressor maintains an appropriate degree of superheat and the temperature of the thermosensor tube 7 is stable, low pressure fluctuations may occur. The throttling mechanism 13 installed in the outer equalizing tube 6 prevents the occurrence of notching that is transmitted through the outer equalizing tube to the lower part of the diaphragm of the external pressure equalizing type temperature-type expansion valve and is unrelated to the temperature-sensitive cylinder temperature. This reduces the low pressure fluctuations and transmits a stable low pressure to the lower part of the diaphragm, thereby making it possible to prevent hunting unrelated to the temperature of the thermosensor cylinder.

Effects of the 6-Bay Invention The present invention provides a heat collection circuit that connects a heat collector, an accumulator, a compressor, a condenser, and an external pressure-equalizing temperature-type expansion valve. A throttling mechanism is provided to prevent low pressure fluctuations that occur when the pressure loss on the low pressure side is large from being directly transmitted to the lower part of the diaphragm of the external pressure equalization temperature type expansion valve, thereby preventing hunting unrelated to the temperature sensing cylinder temperature. As a result, the durability and reliability of the diaphragm can be improved, and periodic load fluctuations to the compressor motor can be prevented, improving the reliability of the entire system.
This has the effect of improving durability.

[Brief Description of the Drawings] Fig. 1 is a block diagram of a conventional solar water heater consisting of a heat collecting circuit and a hot water heating circuit, and Fig. 2 is a block diagram of a solar water heater according to an embodiment of the present invention. It is. 1...l't3.2...Accumulator, 3...Compressor, 4...Condenser, 5
・・・・・・External pressure equalization type temperature type expansion valve, 6・・・・・・
Outer tube, 13... Throttle mechanism.

Claims (2)

[Claims] (1) A heat collection circuit consisting of a heat collector, an accumulator, a compressor, a condenser, and an external pressure equalization temperature type expansion valve, and a hot water heating circuit consisting of a heat exchanger that exchanges heat with the condenser, a pump, and a heat storage tank. A solar water heater comprising: a throttling mechanism disposed in the outer equalizing tube of the external pressure equalizing temperature type expansion valve. (2) The solar water heater according to claim 1, which is provided with an outer tube having a flow path resistance corresponding to a throttling mechanism.