JPS5986877A - Air-conditioning system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heating and cooling system such as a separate air conditioner.

Conventional configuration and its problems Traditionally, heat pump type separate air conditioners have
When the outside air temperature decreases, the heating capacity decreases and cannot cope with the heating load, so an auxiliary electric heater or the like is installed to increase the heating capacity.

However, for those with a built-in electric heater, for example, in extremely cold regions, heating is mostly done with the heater alone, and this auxiliary heater alone cannot cover the large indoor heating load. In rural areas, it was almost impractical. Therefore, a recently developed system heats the outdoor heat exchanger indirectly with gas or hot water during heating, and releases the heated heat to the indoor heat exchanger to cope with the heating load in extremely cold weather. technology has begun to be used. That is, when the outside air temperature becomes low, the outdoor heat exchanger is heated by gas etc.
The amount of heat is sent to the indoor heat exchanger via the refrigerant,
The idea is to obtain sufficient heating capacity by emitting heat into the room.

However, in these conventional system systems, gas combustion is used only to heat the refrigerant in the outdoor heat exchanger, which is uneconomical, and although it is impossible to supply hot water, gas piping work and combustion equipment are required. becomes indispensable. Therefore, a heating combustion device provided only to increase the heating capacity has the drawback of being uneconomical and making the entire system of a separate air conditioner relatively expensive.

OBJECT OF THE INVENTION The present invention eliminates these conventional drawbacks and provides a system that enables hot water supply, and also
The purpose is to perform good refrigerant control.

Components of the Invention A separate air conditioner in which a compressor, a four-way valve, an outdoor heat exchanger, a heating expansion valve gas-liquid separator, an indoor unit having a plurality of cooling expansion valves, an accumulator, etc. are successively connected. The indoor heat exchanger consists of an air-cooled heat exchanger and a refrigerant heating heat exchanger, and during cooling, the air-cooled heat exchanger exchanges heat.
During heating, when the outdoor temperature is high, the air-cooled heat exchanger exchanges heat, and when the outdoor temperature is low, the refrigerant heating heat exchanger exchanges heat, and the refrigerant heating heat exchanger is a double pipe type. This is a heating and cooling system connected to a heating and hot water boiler.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is outdoor unit, 2 is outdoor unit 1, 3 is 2
No. indoor unit, 4 is a compressor, 5 is a four-way valve, 6 is an air-cooled heat exchanger on the outdoor side, 7 is a refrigerant heating heat exchanger such as a double pipe,
8 is a heating expansion valve, 9 is a check valve, 10 is a gas-liquid separator, 1
1 is the source side three-way valve, 12 is the source side first solenoid valve, 13 is the source side second solenoid valve, 14.17 is the cooling expansion valve, 15.18 is the reversal valve, 16.19 is the indoor heat exchanger , 2o is the gas side first solenoid valve, 21 is the gas side second solenoid valve, 22.23 is the check valve,
24 is the gas side three-way valve, 25 is the accumulator, 2δ
1 is a high-pressure pressure regulating valve, 7 is an electric three-way valve that operates by sensing outside air temperature, 2B is a No. 1 solenoid valve installed in the middle of the bypass circuit 29, and 30 is a No. 2 solenoid valve installed in the middle of the bypass circuit 31. The solenoid valve No. 32 is a double-pipe boiler for heating and hot water supply, and the gas pipe 33 is used to draw gas. The piping 39° 40 is connected to each hot water supply port 34° 35, 36, 37, and connected to the refrigerant heating heat exchanger 7 via the pump 38.
connected with. The solid line arrow indicates a refrigerant circuit during cooling, and the dotted line arrow indicates a refrigerant circuit during heating.

In the above configuration, for example, during cooling, as shown in Table 1, the electric three-way valve 27 flows between a and 0, the No. 1 solenoid valve 28 is closed, and the No. 2 solenoid valve 3o is open.

However, during cooling, the compressor 4. Four-way valve6. Air-cooled heat exchanger, etc., No. 2 solenoid valve 30. Between C-8 of electric three-way valve 27, check valve 1. Gas-liquid separator 10. Source side three-way valve 11, No. 1 solenoid valve 12, No. 2 solenoid valve 13. It flows through the cooling expansion valve 14, 17, the indoor heat exchanger 16, 19° check valve 22, 23, the gas side three-way valve 24, and the four-way valve 6° accumulator 26. Therefore, at this time, the refrigerant heating heat exchanger 7 is bypassed, and the water supply from the heating hot water supply boiler 32 is stopped.

Next, during heating, as shown in FIG. 3, the electric three-way valve 27 causes the flow to flow between a and b when the temperature is lower than a predetermined temperature, and
The No. 1 solenoid valve 28 is open, the No. 2 solenoid valve 30 is closed, and when the temperature is high, the flow flows between 4 and c, and the No. 1 solenoid valve 28 is closed, and the
No. 3 solenoid valve 30 is opened.

However, during heating, the compressor 4. Four-way valve5. Gas side three-way valve 24, gas side first solenoid valve 20, gas side second solenoid valve 21.
Indoor heat exchanger 16, 19, check valve 15, 18, source side 1st
Solenoid valve 12, source side second solenoid valve 13, source side three-way valve 11. Gas-liquid separator 10. When the heating expansion valve 8 is at high temperature, the air-cooled heat exchanger 6 absorbs heat.
No. 3 solenoid valve, air-cooled heat exchanger 6. Four-way valve5. It flows with the accumulator 25. When the temperature is low, the electric three-way valve 27
-b, the hot water is switched to the refrigerant heating heat exchanger 7, and at this time, hot water is sent from the heating hot water supply boiler 32 to the outer pipe of the refrigerant heating heat exchanger 7 via the piping 39.40, Heat the refrigerant. The heated refrigerant passes through the No. 2 solenoid valve 28, and then enters the four-way valve 6. Accumulator 25. The flow returns to the compressor 4.

Effects of the Invention As described above, the present invention provides an outdoor heat exchanger that includes an air-cooled heat exchanger and a refrigerant heating heat exchanger, and a three-way electrically operated A No. 2 solenoid valve is provided at one port of this electric three-way valve to open and close the flow to the air-cooled heat exchanger, and a No. 1 solenoid valve that bypasses the air-cooled heat exchanger.
A hot water boiler for heating and hot water supply is connected to the heat exchanger for heating the refrigerant, and when the outside air temperature is high during heating, the air-cooled heat exchanger performs heating using the outside air heat source,
When the outside temperature is low, the refrigerant is heated by the hot water from the boiler in the refrigerant heating heat exchanger, so even during extremely cold heating times, stable heating capacity can be obtained. This will solve the problem of insufficient heating capacity in extremely cold regions. Furthermore, by connecting a standard hot water boiler for heating, stable heating can be obtained as well as hot water supply, and the piping configuration is simple, so the cost will not increase significantly. Therefore, as a heating and cooling system that can supply hot water, it is economical and has practical effects in terms of running costs and initial costs.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of a separate air conditioner according to an embodiment of the present invention, Fig. 2 is a chart showing the flow state of the electric three-way valve, No. 1 solenoid valve and No. 2 solenoid valve during cooling; Figure 3 is a chart diagram during heating. 27...
...Electric three-way valve, 28...No. 1 solenoid valve, 30
...No. 2 solenoid valve, 3゜... Heating hot water boiler 0

Claims (1)

[Claims] An indoor unit with a compressor, a western valve, an outdoor heat exchanger, a heating expansion valve, a gas-liquid separator, and multiple cooling expansion valves,
Accumulators, etc. are successively installed, and the outdoor heat exchanger is configured to include an air-cooled heat exchanger and a refrigerant heating heat exchanger, and between these heat exchangers and a heating expansion valve. , an electric three-way valve is provided, and one port of the electric three-way valve is provided with a No. 2 solenoid valve that opens and closes the flow to the air-cooled heat exchanger, and a No. 1 solenoid valve that bypasses the air-cooled heat exchanger; A heating and cooling system consisting of a heat exchanger for heating refrigerant and a boiler for heating and hot water supply.