JPH01196456A - Air conditioner provided with coolant heater - Google Patents

Abstract

PURPOSE:To make it possible to positively carry out recovery of a coolant without impairing the life of a compressor by changing the time of a coolant recovering work which is carried out at the initial period of a space heating operation by an external air temperature. CONSTITUTION:The necessary coolant recovery time of a compressor 1 varies depending upon an external air temperature. That is, as the external air temperature becomes low, the rise up of the compressor 1 is deteriorated and the accumulation of the coolant into an outdoor heat exchanger becomes large. Thereby, the coolant recovering time is prolonged. On the other hand, in a case where the external air temperature is relatively high the recovery of the coolant is completed in a short time. Therefore, by setting the coolant recovering time by the external air temperature, it is possible to set an optimum coolant recovering time. Consequently, the compressor 1 does not carry out a vacuum operation and further the life of the compressor is not impaired. In addition, there is no waste in the coolant recovering time, and the time up to the hot air flow discharge can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air conditioner equipped with a refrigerant heating device.

BACKGROUND OF THE INVENTION In recent years, air conditioners equipped with a refrigerant heating device have been put into practical use.

An example of an air conditioner equipped with a refrigerant heating device will be described below with reference to the drawings.

FIGS. 4 and 5 show a refrigeration cycle diagram and a flowchart of an air conditioner equipped with a conventional refrigerant heating device. In Fig. 4, 1 is a compressor, 2 is a four-way valve that switches the flow of refrigerant, 3 is an indoor heat exchanger on the usage side, 4 is a two-way valve that flows refrigerant to a refrigerant heating device for heating, and 5 is a refrigerant heating device that is a heat source for heating, 6 is an outdoor heat exchanger for cooling, 7 is a check valve that stops the flow of refrigerant during heating, 8 is a pressure reducer for cooling, and 9 is a reverse valve that stops the flow of refrigerant during heating. It is a stop valve.

The air conditioner equipped with the refrigerant heating device configured as described above will be explained according to the flowchart shown in FIG.

After the start of operation, when cooling is selected, the compressor 1 is turned on, and the refrigerant flows in the direction of the dashed arrow in Figure 4.The indoor heat exchanger 3, which is the user side, becomes low temperature and low pressure, enabling cooling, and a stop command is issued. Run the air conditioner until When marco heating is selected, refrigerant recovery work is performed to recover the refrigerant stored in the outdoor heat exchanger 6 into the heating cycle. This turns on four-way valve 2.
By connecting the outdoor heat exchanger 6 to the suction side of the compressor 1 through the check valve 9 and turning on the compressor 1, the refrigerant stored in the outdoor heat exchanger 6 is transferred to the indoor heat exchanger 3.
This prevents the refrigerant from accumulating in the outdoor heat exchanger 6 that is not used during heating. This refrigerant recovery work is time-controlled, and products that can be completed within a certain amount of time (90 seconds) have been commercialized. In other words, 9 in any state
This is because 0 seconds is enough time to recover the refrigerant. After this refrigerant recovery work, the two-way valve 4 is opened and the refrigerant heating device 5
By flowing refrigerant into the chamber and turning on combustion, the indoor heat exchanger 3 becomes 100,000 yen temperature and high pressure, and heating operation is possible. Next, when a stop command is received, compressor 1, combustion, two-way valve 4, and four-way valve 2 are turned off.
F, and the heating operation ends.

Problems to be Solved by the Invention However, in an air conditioner equipped with a refrigerant heating device configured as described above, the refrigerant recovery operation time is constant at 90 seconds, and the compressor always operates for 90 seconds. Therefore, if refrigerant recovery is completed in less than 90 seconds,
The compressor will be operated under vacuum, which will significantly shorten its life.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to prevent the life of a compressor from being shortened due to refrigerant recovery work.

Means for Solving the Problems In order to solve the above problems, an air conditioner equipped with the refrigerant heating device of the present invention includes a compressor and a four-way valve.

Outdoor heat exchanger, reverse ratio valve, pressure reducer, indoor heat exchanger.

Check valves are sequentially connected in an annular manner, and the indoor heat exchanger inlet and
A refrigeration cycle is constructed by connecting the suction side of the compressor to the suction side of the compressor via a two-way valve and a refrigerant heating device. A control device that determines a time period for performing a refrigerant recovery operation by connecting a heat exchanger to the suction side of the compressor and connecting the indoor heat exchanger to the discharge side of the compressor, based on a signal from the outside temperature sensor. This is one thing.

Function: With the above configuration, the present invention reliably recovers the refrigerant without impairing the life of the compressor by changing the refrigerant recovery operation time performed at the beginning of the heating operation depending on the outside temperature.

EXAMPLE Hereinafter, an air conditioner equipped with a refrigerant heating device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a refrigeration cycle diagram of this embodiment. Components that are the same as those in the conventional example are given the same numerals and explanations will be omitted. 10 is an outside temperature sensor that senses outside temperature. @2 Figure is omitted because it is the same as the flow button example showing the operation of this embodiment.
The refrigerant recovery work will be explained. As shown in FIG. 3, it has been experimentally confirmed that the required refrigerant recovery time of the compressor 1 changes depending on the outside temperature (the numerical value varies depending on the type, size, etc. of the compressor). That is, the lower the outside temperature is, the harder the compressor 1 is to stand, and the more refrigerant is stored in the outdoor heat exchanger, so the refrigerant recovery time becomes longer. However, on the other hand, it can be seen that when the outside temperature is relatively high, refrigerant recovery is completed in a short time. Therefore, the optimal refrigerant recovery time can be set by setting the refrigerant recovery time according to the outside temperature as shown in the graph of FIG. 3 as shown in the flowchart of FIG. The compressor 1 will not operate in a vacuum due to pressure, and its life will not be impaired. In addition, there is no waste in the refrigerant recovery time, which can be shorter on average than the conventional fixed time (90 seconds), and the time until hot air is blown out can also be shortened.

Effects of the Invention As described above, the present invention optimally controls the refrigerant recovery operation time depending on the outside temperature, thereby preventing the life of the compressor from being shortened. Because the refrigerant recovery time can also be shortened,
It also has the effect of shortening the time it takes for hot air to blow out.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram of an embodiment of the present invention, Fig. 2 is a flowchart of the same embodiment, Fig. 3 is a characteristic diagram of outside temperature and required refrigerant recovery time, and Fig. 4 is a refrigeration cycle diagram of a conventional example. ,
FIG. 5 is a flowchart of a conventional example. 1... Compressor, 2... Four-way valve, 3...
...Indoor heat exchanger, 4...Two-way valve, 5...
... Refrigerant heating device, 6 ... Outdoor heat exchanger,
7... Check valve, 8... Pressure reducer, 9...
...Check valve, 10...Outside temperature sensor. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
--Pressure machine゛2~--Shiho 3---*Tjg% interlacer 4-2 Well 5~--1 Refrigerant crack 6-對>Heat exchange product 7-Renstop square 3 -N Intimidation Number 2 Figure 3-10Q /θ

Claims (1)

[Claims] A compressor, a four-way valve, an outdoor heat exchanger, a check valve, a pressure reducer, an indoor heat exchanger, and a check valve are sequentially connected in an annular manner, and the inlet of the indoor heat exchanger and the suction side of the compressor are connected in two directions. A refrigeration cycle is configured by connecting the valve and the refrigerant heating device, and the outdoor heat exchanger is connected to the suction side of the compressor by switching the four-way valve. ,
An air conditioner equipped with a refrigerant heating device including a control device that determines a time period during which the indoor heat exchanger is connected to the discharge side of the compressor and a refrigerant recovery operation is performed based on a signal from the outside temperature sensor. .