JPS60155859A - Solar heat and air heat collecting type heat pump water heater - Google Patents

Abstract

PURPOSE:To permit operation of maximum efficiency as well as setting of safe defrosting cycle and prevent compression of liquid in a compressor by a method wherein an expansion valve and a capillary tube are arranged in parallel through a non-return valve so as not to flow refrigerant there-into mutually. CONSTITUTION:A heat collecting circuit is constituted of the capillary tube 8 and a heat collector 9, which are arranged in parallel to a series circuit consisting of the expansion valve 5 and the non-return valve 6 through the non-return valve 7. The refrigerant flows through a route shown by a full line in a four-way valve 3 or full line arrow signs in the diagram upon collecting solar heat and air heat. When frosting is advanced in the heat collector 9 upon collecting heat, especially under the condition of low atmospheric temperature, and the temperature of a frosting sensor 11 has arrived at a temperature lower than a given temperature, the four-way valve 3 is switched by a control circuit to change the flow of refrigerant into a reverse cycle constitution and the operation enters into the defrosting operation. The refrigerant flows into the arrow sign directions of dotted lines upon defrosting operation. According to this operation, respective independent proper refrigerating cycles are permitted to be constituted as the expander upon heat collection or defrosting and the case of flowing the refrigerant liquid into the compressor becomes very rare whereby the damage of the compressor due to compressing the refrigerant liquid may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar air heat collector comprising a heat collector circuit that collects solar heat and atmospheric heat, and a hot water heating circuit that raises the temperature of water using the collected heat. This relates to a type heat pump water heater.

Conventional configurations and their problemsConventional solar air/air heat collector type heat pump water heaters, fin tube type collectors, and accumulators.

A heat collection circuit that connects the compressor, condenser, and thermostatic expansion valve,
It consists of a hot water heating circuit consisting of a heat exchanger that exchanges heat with the condenser, a circulating water pump, and a hot water storage tank.

In such water heaters, when the outside temperature is low, frost forms on the entire surface of the heat collector, and as the frost formation progresses, the refrigerant liquid returns to the compressor side, liquid compression occurs, and the temperature rises rapidly and excessively. This will add a load. As a result, there was a risk of damage to the piston, discharge valve, etc.

On the other hand, there are cases where a heat collecting circuit is formed through a four-way valve at the inlet and outlet of the compressor, and a reverse cycle defrosting circuit is utilized by switching the four-way valve. This water heater using a heat collector circuit defrosts water by switching a four-way valve to cause the refrigerant to flow in a reverse cycle when frost buildup on the heat collector exceeds a certain level. In this case, the temperature-sensitive cylinder of the thermostatic expansion valve is generally attached to the pipe wall on the low-pressure side, such as at the exit position of the heat collector.
ing. Therefore, when the four-way valve is switched to start defrosting operation, the temperature of the tube wall of the thermosensor tube rises rapidly, causing expansion of 3, -,...
.

The expansion valve becomes open, and the refrigerant liquid returns to the compressor via the expansion valve and condenser, resulting in the same problem of liquid compression as described above. There was a problem that the refrigeration cycle, which is a so-called defrosting circuit, was incomplete.

OBJECTS OF THE INVENTION The present invention solves these conventional problems and enables optimal defrosting operation.

Structure of the Invention The present invention comprises a check valve arranged in series with the outlet of a thermostatic expansion valve to constitute an expander circuit during heat collection operation, and further a series circuit of the thermostatic expansion valve and the check valve. A capillary tube is installed in parallel with a check valve to connect the expander circuit during defrosting (
Hereinafter, it constitutes a bypass circuit (hereinafter referred to as a bypass circuit). With this configuration, the refrigerant during heat collection is prevented from flowing into the bypass circuit by the check valve and flows only into the expansion valve, while the refrigerant during defrosting is directed toward the expansion valve by the check valve. The inflow is blocked and only the bypass circuit is allowed to flow. Therefore, it is possible to configure an appropriate refrigeration cycle independently, such as as an expander during heat collection or as an expander during defrosting. This means that damage to the compressor due to liquid compression, etc., can be reduced to a minimum.

DESCRIPTION OF EMBODIMENTS In FIG. 1, a check valve 6 is arranged in series with a compressor 1, an accumulator 2, a four-way valve 3, a condenser 4, and an expansion valve 5, and the expansion valve 6 and the check valve 6 are separately provided. A capillary tube 8 disposed via a check valve 7 in parallel with the series circuit to be formed.
The heat collector 9 constitutes a heat collection circuit, and the one-point hot water tank 16,
Circulating water pump 14, condenser 2 for exchanging heat between water and refrigerant
This constitutes a hot water heating circuit. The frost sensor 11 is still attached to the outlet pipe wall of the heat collector 9.

Next, the operation of the solar/air heat collection type heat pump water heater having the above configuration will be explained. Normally, the refrigerant when collecting solar air heat flows as shown by the solid line, arrow, and solid line arrows of the four-way valve 3. During this heat collection, especially under low outside temperature conditions, if frost progresses in the heat collector and the temperature of the frost sensor reaches a certain temperature or below, a control circuit (not shown) will activate the four-way valve. 3 is switched, the refrigerant flow changes to a reverse cycle configuration, and defrosting operation begins. During defrosting operation, the refrigerant flows in the direction of the dotted arrow, so the optimal refrigeration cycle expander during defrosting operation can be set by the capillary tube itself.

Effects of the Invention By configuring the expansion valve and the capillary tube in parallel via a check valve so that refrigerant does not flow into each other, the expander of the refrigeration cycle is optimal when collecting heat. Settings can only be made using the type expansion valve, allowing operation at maximum efficiency. On the other hand, the expander of the refrigeration cycle, which is most suitable for defrosting, is set by a capillary tube, which enables safe defrosting cycle settings, prevents liquid compression in the compressor, and extends the service life. can be expected.

[Brief explanation of the drawing]

The figure is a configuration diagram of a solar-air heat collecting type heat pump water heater according to an embodiment of the present invention. 6<-9 1...Compressor, 2...Accumulator, 3...Mark/four-way valve, 4...Condenser, 5...
... Temperature expansion valve, 6... Check valve, 7...
...Check valve, 8...Capillary tube,
9... Heat collector, 14... Circulating water pump, 15... Hot water storage tank.

Claims (1)

[Claims] A heat collection circuit consisting of a heat collector, a four-way valve, an accumulator, a compressor, a condenser, and an expansion valve, a hot water heating circuit that supplies heat from the condenser to the hot water storage tank, and a heat collection circuit arranged in series with the expansion valve. A solar air/air heat concentrator heat pump consisting of a capillary tube connected through the check valve in parallel to the series circuit formed by the expansion valve and the check valve to form a bypass circuit. Hot water machine.