JPH02275258A - Air conditioner equipped with refrigerant heating device - 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 Industrial Application The present invention relates to an air conditioner equipped with a refrigerant heating device.

2. Description of the Related Art A conventional air conditioner equipped with a refrigerant heating device has a refrigeration cycle as shown in FIG. It was set up. During the heating operation, the control shown in FIG. 6 was performed. That is, when a heating operation instruction is received (step 101), the four-way valve 2 is switched to the heating operation side, the first two-way valve 9 is closed, the compressor 1 is operated, and the outdoor heat exchanger 6 is closed.
Collect the refrigerant remaining in the indoor heat exchanger 3 (
Step 102), after performing the refrigerant recovery operation for a certain period of time (step 103), the first two-way valve 9 is opened and the compressor 1, four-way valve 2, indoor heat exchanger 3, and refrigerant heating device 8 are opened.
The refrigerant is circulated in a refrigeration cycle that connects the refrigerant, the burner 8a is combusted to heat the refrigerant, and the room enters a normal heating operation mode in which heat is radiated from the indoor heat exchanger 3 and a heating operation is performed (step 104).

During the heating operation, the temperature of the heat exchanger 8b of the refrigerant heating device is detected by the thermistor 0, and when the temperature becomes higher than the set value T I ''C (step 105), the burner 8a is stopped (step 106). , set temperature T2°C
When it becomes lower (step 107), burner 8a is turned on again.
(step 108) to prevent the heat exchanger 8b of the refrigerant heating device from becoming abnormally high temperature.

Problems to be Solved by the Invention However, in the air conditioner equipped with the conventional refrigerant heating device as described above, since the first two-way valve 9 is located on the inlet side of the refrigerant heating device 8, the refrigerant is not heated at the start of heating operation. During the recovery operation, the heat exchanger 8b of the refrigerant heating device is on the low pressure side and the temperature drops, and the burner 8a is burned after the refrigerant recovery operation is completed.

Therefore, even if the refrigerant recovery operation is ended and the normal heating operation mode is entered, it takes time for the temperature of the heat exchanger 8b of the refrigerant heating device to rise, and it takes time for the refrigerant to be heated. , the start-up characteristics of heating operation were getting worse.

In addition, if the pressure loss of the indoor heat exchanger 3 is large, such as when the indoor unit 14 is installed at a lower position than the outdoor unit 13, the compressor 1 will be sufficiently warmed and the pressure difference between the high pressure side and the low pressure side will be reduced. The refrigerant recovered by the indoor heat exchanger 3 during the refrigerant recovery operation remains accumulated in the indoor heat exchanger 3 until the temperature increases. Therefore, until the compressor 1 is sufficiently warmed up, the amount of refrigerant circulated is reduced, resulting in poor start-up characteristics of the heating operation.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to improve the startup characteristics of heating operation of an air conditioner equipped with a refrigerant heating device.

Means for Solving the Problems In order to solve the above problems, the present invention provides a first two-way valve on the outlet side of the refrigerant heating device.

Moreover, the present invention preheats the heat exchanger of the refrigerant heating device by combusting the burner at the same time as performing the refrigerant recovery operation at the start of the heating operation.

Furthermore, the present invention connects the discharge side of the compressor and the inlet side of the refrigerant heating device via a second two-way valve, and provides a bypass path that bypasses the indoor heat exchanger, and provides a bypass path for a certain period of time at the start of heating operation. This opens the second two-way valve.

action The effects of the above means are as follows.

In the present invention, by providing the first two-way valve on the outlet side of the refrigerant heating device, during the refrigerant recovery operation at the start of heating operation, the heat exchanger of the refrigerant heating device is on the high pressure side, so that the temperature does not drop and heating operation is continued. The rise characteristics can be improved.

Further, the present invention performs a refrigerant recovery operation at the start of the heating operation, and simultaneously burns the burner and preheats the heat exchanger of the refrigerant heating device, so that when the refrigerant recovery operation ends and the normal heating operation mode starts The heat exchanger of the refrigerant heating device is at a high temperature. Therefore, the start-up characteristics of heating operation can be improved.

Furthermore, the present invention connects the discharge side of the compressor and the inlet side of the refrigerant heating device via a second two-way valve, and provides a bypass path that bypasses the indoor heat exchanger to start constant heating operation. By opening the second two-way valve for one hour, the refrigerant recovered from the outdoor heat exchanger during the refrigerant recovery operation is recovered to the heat exchanger of the refrigerant heating device. therefore,
When entering normal heating operation mode after refrigerant recovery operation,
It is possible to prevent refrigerant from accumulating in the indoor heat exchanger and reduce the amount of circulation, and improve the startup characteristics of heating operation.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

First, referring to FIG. 1, a first embodiment of the present invention will be explained. In the same figure, 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a pressure reducer, and 5 is a first A stop valve, 6 is an outdoor heat exchanger, 7 is a second check valve, 8 is a refrigerant heating device, 8a is a burner, 8b is a heat exchanger of the refrigerant heating device, 9 is a first two-way valve, 10 is a thermistor.

Since the control during heating operation is the same as that of the conventional example, the explanation will be omitted. However, in this embodiment, during the refrigerant recovery operation at the start of heating operation, the heat exchanger 8b of the refrigerant heating device is on the high pressure side, and the temperature Therefore, if the refrigerant recovery operation is ended and the burner 8a is combusted and the normal heating mode is entered, the temperature of the heat exchanger 8b of the refrigerant heating device will immediately rise, and it will take time until the refrigerant is heated. The start-up characteristics of heating operation can be improved without any trouble.

Next, a second embodiment of the present invention will be described with reference to FIG.

Here, since the refrigeration cycle is the same as that in the first embodiment, a description thereof will be omitted.

FIG. 2 is a control flow diagram during heating operation in the second embodiment. When an instruction for air conditioning operation is received (step 109), the four-way valve 2 is switched to the heating operation side, the first two-way valve 9 is closed, the compressor 1 is operated, and the refrigerant recovery operation is performed. At the same time, the burner 8a is combusted to remove the refrigerant. The heat exchanger 8b of the heating device is preheated (step 110). After a certain period of time (step 111)
) The first two-way valve 9 is opened to finish refrigerant recovery and enter the normal heating operation mode (step 112), but at this point the heat exchanger 8b of the refrigerant heating device has already been sufficiently heated and has reached a high temperature. ing.

Therefore, when the normal heating operation mode is entered, the refrigerant is immediately heated and the start-up characteristics of the heating operation can be improved.

Also, like the conventional example, during heating operation, the temperature of the heat exchanger 8b of the refrigerant heating device is detected by the thermistor 10 to control combustion and stop of the burner 8a. 8b does not become abnormally high temperature.

Further, a third embodiment of the present invention will be described with reference to FIGS. 3 and 4.

FIG. 3 is a refrigeration cycle diagram of a third embodiment of the present invention. Here, 11 is a second two-way valve, 12 is a third reverse valve, and the other parts are the same as in the first embodiment of the present invention, so a description thereof will be omitted.

FIG. 4 is a control flow diagram of a third embodiment of the present invention.

When the heating operation instruction is received (step 113), the four-way valve 2
is switched to the heating operation side, the first two-way valve 9 is closed, the second two-way valve 11 is opened, the compressor l is operated, and the refrigerant accumulated in the outdoor heat exchanger 6 is transferred to the refrigerant heating device. A refrigerant recovery operation is performed to recover the refrigerant into the heat exchanger 8b (step 114). At the same time, the burner 8a is combusted, and the heat exchanger 8 of the refrigerant heating device is
The refrigerant recovered to the heat exchanger 8b of the refrigerant heating device is preheated (step 114). After a certain period of time (
Step 115) The first two-way valve 9 is opened to end the refrigerant recovery operation, and the second two-way valve 11 is closed to enter the normal heating operation mode (Step 116). The refrigerant recovered by the heat exchanger 8b of the heating device and the heat exchanger 8b of the refrigerant heating device is sufficiently heated and has a high temperature. Therefore, when the normal heating operation mode is entered, high-temperature refrigerant is immediately circulated, and the start-up characteristics of the heating operation can be improved.

Also, like the conventional example, during heating operation, the temperature of the heat exchanger 8b of the refrigerant heating device is detected by the thermistor 10 to control combustion and stop of the burner 8a. 8b does not become abnormally high temperature, and furthermore,
Even when the pressure loss of the indoor heat exchanger 3 is large, such as when the indoor unit S is installed at a lower position than the outdoor unit 11, the refrigerant does not remain in the indoor heat exchanger 3, and As soon as the normal heating operation mode is entered, high-temperature refrigerant is circulated and the compressor l quickly warms up. Therefore, when the normal heating operation mode is entered, the amount of refrigerant circulation becomes sufficient immediately, and the start-up characteristics of the heating operation can be improved.

As described in detail, the present invention provides the first two-way valve on the outlet side of the refrigerant heating device, so that during the refrigerant recovery operation at the start of heating operation, the heat exchanger of the refrigerant heating device maintains high pressure. This prevents the temperature from dropping and improves the start-up characteristics of heating operation.

Further, the present invention performs a refrigerant recovery operation at the start of the heating operation, and simultaneously burns the burner and preheats the heat exchanger of the refrigerant heating device, so that when the refrigerant recovery operation ends and the normal heating operation mode starts The heat exchanger of the refrigerant heating device is at a high temperature. Therefore, the start-up characteristics of heating operation can be improved.

Furthermore, the present invention connects the discharge side of the compressor and the inlet side of the refrigerant heating device via a second two-way valve, and provides a bypass path that bypasses the indoor heat exchanger, and provides a bypass path for a certain period of time at the start of heating operation. By opening the second two-way valve, the refrigerant recovered from the outdoor heat exchanger in the refrigerant recovery operation is recovered to the heat exchanger of the refrigerant heating device. Therefore, when the normal heating operation mode is entered after the end of the refrigerant recovery operation, it is possible to prevent the refrigerant from accumulating in the indoor heat exchanger and reduce the amount of circulation, and to improve the start-up characteristics of the heating operation.

[Brief explanation of drawings]

FIG. 1 is a refrigeration cycle diagram of the first embodiment of the present invention, FIG. 2 is a control flow diagram thereof, FIG. 3 is a refrigeration cycle diagram of the second embodiment of the present invention, and FIG. Same control flow diagram, 5th
The figure is a refrigeration cycle diagram of a conventional example, and FIG. 6 is a control flow diagram of the same. 1... Compressor, 2... Four-way valve, 3...
... Indoor heat exchanger, 4 ... Pressure reducer, 5.
...First check valve, 6...Outdoor heat exchanger, 7...Second check valve, 8...Refrigerant heating device, 9...First two-way valve, 11...
...Second two-way valve. Figure 3 -m- -m- -m- -m- -m- 8~-One pressure Rei four-way valve chamber prisoner 14 'RPj pressure 6 7-1 reversal valve chamber 9) elF$ 9 Nmi 72Φ check valve: 51X sword formation device diagram diagram

Claims (3)

[Claims] (1) Compressor, four-way valve, indoor heat exchanger, pressure reducer, 1st
A check valve, an outdoor heat exchanger, and a second check valve are connected in an annular manner, a refrigerant heating device is connected from between the indoor heat exchanger and the pressure reducer to the suction side of the compressor, and the An air conditioner equipped with a refrigerant heating device including a first two-way valve on the outlet side of the refrigerant heating device. (2) Refrigerant heating according to claim (1), characterized in that at the start of heating operation, the refrigerant in the outdoor heat exchanger is recovered and at the same time a burner is combusted to preheat the heat exchanger of the refrigerant heating device. Air conditioner equipped with equipment. (3) Connect the discharge side of the compressor and the inlet side of the refrigerant heating device to the second
Claim (1) or (1) wherein a bypass path is provided to connect the two-way valve to the indoor heat exchanger and bypass the indoor heat exchanger, and the two-way valve is controlled to be open for a certain period of time at the start of heating operation. 2
) An air conditioner equipped with the refrigerant heating device.