JPS6141852A - Controller for quantity of refrigerant circulated of refrigerant heating type air conditioner - 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 refrigerant circulation amount control device for a refrigerant-heating air conditioner that cools or heats a room.

Configuration of a conventional example and its problems The circuit of a conventional refrigerant heating type air conditioner is shown in FIG. The refrigeration cycle P sequentially connects a compressor 101, a four-way valve 102, an indoor heat exchanger 10a1, a cavity 104, an outdoor heat exchanger 105, and a check valve 106, 107, and further connects the outdoor heat exchanger 105 in parallel. A refrigerant heating section 108a consisting of a fuel combustor 108 and a heat exchanger 109, and a two-way valve 110
and a bypass circuit 111a that connects the suction side and the discharge side of the compressor 101 via the two-way valve 111.

During cooling operation, the two-way valves 110 and 111 are closed.
The refrigerant flows in the direction of the solid arrow.

Next, in the case of heating operation, at startup, the four-way valve 102 is switched and the two-way valves 110 and 111 are closed, and the refrigerant in the outdoor heat exchanger 105 is removed by the compressor 101, so-called refrigerant removal control. After this is performed, the two-way valve 110 is opened. Due to the action of the check valves 106 and 107, the refrigerant does not flow into the outdoor heat exchanger 105.

Furthermore, during the heating operation, the two-way valve 111 is opened to allow the refrigerant to flow through the bypass circuit 111a in order to reduce the amount of refrigerant circulation and reduce the input to the compressor 101 compared to the cooling operation. Therefore, the refrigerant flows in the direction of the dashed arrow.

However, in this configuration, the compressor 101 and the refrigerant heating section 108a are located at a higher position than the indoor heat exchanger 103, and when the indoor temperature is low, the liquid refrigerant remains in the indoor heat exchanger 103 and circulates through the circuit. The amount of refrigerant gradually decreases. As a result, the amount of heat exchanged in the refrigerant heating section 108a decreases, and the heating capacity decreases. Furthermore, since the amount of heat generated by combustion in the refrigerant heating section 108a is kept constant, the compressor 101
There is a problem that the temperature of the refrigerant heating section 108a and the exhaust gas increases.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional problems.By controlling the amount of refrigerant circulation in the refrigerant circuit in a refrigerant-heating air conditioner, the present invention prevents a decrease in heating capacity and improves the compressor and refrigerant heating section. The purpose is to prevent overheating.

Structure of the Invention In order to achieve this object, the present invention detects the refrigerant temperature at the outlet of the heat exchanger in the refrigerant heating section, compares it with a set value, and outputs a signal to open and close the two-way valve. It is equipped with a detector.

With this configuration, the bypass circuit is opened and closed depending on the refrigerant temperature at the outlet of the heat exchanger of the refrigerant heating section, and the amount of refrigerant circulated in the air conditioner circuit is controlled, thereby preventing a decrease in heating capacity and reducing the temperature of the refrigerant heating section and compressor. This prevents overheating.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

First, a refrigerant circuit of a refrigerant heating type air conditioner will be explained with reference to FIG.

In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a capillary tube, 5 is an outdoor heat exchanger, and 6
and 7 are regurgitation valves. In addition, in parallel with the outdoor heat exchanger 5,
A refrigerant heating section 8a consisting of a fuel combustor 8 and a heat exchanger 9 and a two-way valve 10 that opens when energized are connected. Further, a bypass circuit 11a connecting the suction side and the discharge side of the compressor 1 is connected via a two-way valve 11 that opens when energized. 12 is a two-way valve 11 when the discharge pressure reaches a set value.
The pressure switch 15 is energized to open and is a temperature detector which stops energizing to close the two-way valve 11 when the refrigerant temperature at the outlet of the heat exchanger 9 of the refrigerant heating section 8a exceeds a set value.

Next, an electric circuit diagram during heating operation will be explained with reference to FIG. Components that are the same as in FIG. 1 are given the same numbers.

In the figure, 13 is a power supply, 14 is a power switch, and 16 is a power supply.
is a timer that energizes the two-way valve to open after a certain period of time.

In the above configuration, since the cooling operation is the same as the conventional one, the explanation will be omitted, and the heating operation will be explained.

First, when the power switch 14 is turned on, the compressor 1 and the four-way valve 2 are energized. At this time, since the two-way valves 10 and 11 are closed, the refrigerant in the outdoor heat exchanger 5 and the heat exchanger 9 of the refrigerant heating section 8a is removed by the compressor 1, so-called refrigerant removal control is performed. . After a certain period of time has elapsed, the contacts of the timer 16 are closed and energized, and the two-way valve 10 is opened.

Due to the action of the check valves 6 and 70, the refrigerant does not flow to the outdoor heat exchanger, but passes through the refrigerant heating section and is sucked into the compressor 1.

Furthermore, when the discharge pressure reaches the set value, pressure switch 1
2 is closed, the two-way valve 11 is energized, and the bypass circuit 11a is opened.

Therefore, in FIG. 1, the refrigerant flows in the direction of the arrow.

Next, the compressor 1 and the refrigerant heating section 8a are connected to the indoor heat exchanger 3.
A case will be described in which liquid refrigerant accumulates in the indoor heat exchanger 3, which is located at a very high position and may occur when the indoor temperature is low, and the amount of refrigerant circulating through the air conditioner circuit decreases.

At this time, the amount of heat generated by combustion in the refrigerant heating section 8a is kept constant, so when the amount of refrigerant circulation decreases, the amount of heat exchange decreases, and the temperatures of the compressor 1, refrigerant heating section 8a, and exhaust gas increase. do. Then, the temperature detector 15 operates upon detecting that the refrigerant temperature at the outlet of the heat exchanger 9 of the refrigerant heating section 8 & has exceeded a set value, and closes the two-way valve 11 and closes the bypass circuit 11a.

Therefore, the amount of refrigerant circulated in the refrigerant circuit increases, and the liquid refrigerant that has accumulated in the indoor heat exchanger a is pushed out to the refrigerant heating section 8a, thereby preventing the liquid refrigerant from remaining in the indoor heat exchanger 3. - From this K, the amount of heat exchange in the refrigerant heating section 8a increases, and the temperatures of the compressor 1 and the refrigerant heating section 8a decrease. Then, the temperature detector 15 closes, the two-way valve 11 is energized, the bypass circuit 11m is opened, and the initial state is restored.

As a result, there is an effect that a decrease in heating capacity can be prevented and overheating of the compressor 1 and the refrigerant heating section 8a can be prevented.

In this embodiment, the temperature detector 15 is equipped with both a temperature detection function and a switch function, but it is also possible to detect the temperature with an element such as a thermistor and operate the switch circuit according to the signal. It can be implemented in the same way with electronic circuits made of

Further, although the two-way valves 10 and 11 are those that open when energized, the same implementation can be made by using ones that close when energized.

Effects of the Invention As described above, the present invention opens and closes the shivering bus circuit depending on the refrigerant temperature at the heat exchanger outlet of the refrigerant heating section, controls the amount of refrigerant circulation, prevents a decrease in heating capacity, and furthermore, It also has the effect of preventing overheating of the refrigerant heating section.

[Brief explanation of drawings]

Fig. 1 is a refrigerant circuit diagram of a refrigerant heating type air conditioner according to an embodiment of the present invention, Fig. 2 is an electric circuit diagram of the same refrigerant heating type air conditioner, and Fig. 3 is a refrigerant circuit diagram showing a conventional example. It is a refrigerant circuit diagram of a heating type air conditioner. 1... Compressor, 2... Four-way valve, 3...
... Indoor heat exchanger, 4 ... Capillary tube, 6 ... Outdoor heat exchanger, 8 ... Fuel combustor, 9 ... Heat Exchanger, 8a...
Refrigerant heating section, 11... Two-way valve, 11a...
...Bypass circuit, 16...Temperature detector. Name of agent: Patent attorney Toshio Nakao and 1 other list
lv! J Figure 2

Claims (1)

[Claims] Compressor, four-way valve, indoor heat exchanger, capillary tube,
A circuit in which outdoor heat exchangers, etc. are connected in sequence, and a refrigerant heating section consisting of a fuel combustor and a heat exchanger is connected in parallel with the outdoor heat exchanger, and a suction side of the compressor via a two-way valve. and a bypass circuit connecting the discharge side to form an air conditioner for both cooling and heating, and further detecting the refrigerant temperature at the outlet of the heat exchanger of the refrigerant heating section and comparing it with a set value to open and close the two-way valve. A refrigerant circulation amount control device for a refrigerant-heating air conditioner equipped with a temperature sensor that sends a signal to activate the refrigerant.