JPS61276663A - Controller for preheating of compressor for 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 compressor preheating control device for an air conditioner equipped with frequency conversion means.

Conventional technology Conventionally, when a compressor is started after being cooled by the outside air temperature around the compressor, a large amount of liquid refrigerant is dissolved in the lubricating oil, and the lubricating oil is diluted. Failure to do so may result in damage to the compressor due to liquid compression due to forming. On the other hand, when the compressor 5 is operated in a cooled state at the start of heating operation, the amount of circulating refrigerant decreases due to the refrigerant dissolved in the lubricating oil, and the heat of the compressed refrigerant is used for heat storage in the compressor, so that the heating used for air conditioning is reduced. There is a problem that the capacity decreases, the start-up time worsens, and the comfort is impaired, so preheating of the compressor is carried out in order to prevent compressor damage and improve comfort by shortening the start-up time. .

An example of a conventional compressor preheating control device for an air conditioner will be described below with reference to the drawings.

FIG. 5 shows a conventional electrical circuit. In the figure, 101 is an outside temperature detection thermistor, 102 is a microcomputer (hereinafter referred to as a microcomputer), and 103 is a frequency changer called an inverter, which receives a signal from the microcomputer 102 and energizes a compressor 104 with a small amount of current. Or turn off the power.

FIG. 6 is a flowchart in the conventional example.

First, it is determined whether the outside temperature 1'T is lower than the set temperature To, and if it is, then it is determined whether the compressor is stopped, and if it is stopped, the time is measured, and the time t after stopping is determined. This is repeated until the time becomes longer than the set time H, and when the set time H is exceeded, a minute current energization signal is output from the microcomputer to the frequency changer, and a minute current is passed through the compressor to preheat it. Here, when the compressor operation signal is input to the microcomputer, the power supply to the compressor is stopped and the operation returns to the original state. Here, the determination as to whether the set time H is exceeded is to eliminate unnecessary preheating immediately after the compressor is operated.

Problems to be Solved by the Invention However, in the above configuration, as shown in the diagram of the relationship between compressor temperature and time in the conventional example shown in FIG. In some cases, electricity is turned on even when it is not necessary, resulting in wasted power. Also, E is the optimum range for preheating effect, but no matter how cold the compressor is, it will not be preheated until the set time has elapsed, and if the compressor is started within the preheating completion time H', there will be no preheating effect. There was a problem.

Means for Solving the Problems In order to solve the above problems, the present invention provides a compressor stop determination means for determining whether the compressor is stopped, as shown in FIG. Compressor temperature detection means is provided in the discharge pipe, means for comparing and calculating the compressor temperature and a preset temperature, means for determining whether or not a compressor operation signal is input, and comparison calculations and determination results thereof. and means for receiving the signal.

According to the above-described configuration, the present invention controls preheating of the compressor while the compressor is stopped by a comparison calculation between the compressor temperature detected outside the compressor or in the discharge pipe and the set temperature. This reduces unnecessary preheating power and improves the preheating effect, thereby improving comfort.

Embodiment Hereinafter, a compressor preheating control device for an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is an electrical circuit diagram of one embodiment of the present invention. In the figure, reference numeral 1 denotes a compressor temperature detection thermistor attached to the outside of the compressor or to the discharge pipe, and the detected compressor temperature is input to a microcomputer 2. The microcomputer 2 determines whether the compressor 4 is running or stopped, determines the presence or absence of a compressor operation signal, and performs comparison calculations between the compressor temperature and a certain set temperature. Supplies current and outputs a stop signal.

These output signals are received by, for example, a frequency converter 3 called an inverter, and the compressor 4 is energized with a small current or stopped.

The operation of the air conditioner compressor preheating control device configured as described above will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a flowchart in this embodiment.

First, it is determined whether the compressor 4 is in operation or stopped, and if it is stopped, the compressor temperature Tc detected from the outside of the compressor 4 or from the discharge pipe is compared with the set temperature TH, and
If it is higher, return to the first determination. If it is low, set temperature T
Compare with L' and if it is higher, return to the first judgment. If the current is low, a small current is applied to the compressor 4.

Next, if there is a compressor operation signal during energization, the compressor energization is stopped and the process returns to the initial determination. In addition, if there is no compressor operation signal, the compressor temperature TC is compared with the set temperature TH, and the current is continued until it exceeds the set temperature TH, and when it exceeds the set temperature TH, the power to the compressor 4 is stopped, and the first This returns to determining whether the compressor is running or stopped.

FIG. 4 is an explanatory diagram showing the relationship between compressor temperature and time in this embodiment.

TC indicates the compressor temperature detected from the outside of the compressor or the discharge pipe, and TH and TL indicate the set temperatures of the high temperature side, low temperature side, respectively. (a) shows the case where the compressor temperature TC is higher than the set temperature TH, and (b) shows the case where the compressor temperature Tc is lower than the set temperature TL. (a>.(b) In both cases, the compressor temperature TC is controlled within a certain temperature range.

As is clear from the above description, the present invention detects the compressor temperature while the compressor is stopped, and controls the compressor temperature to a temperature range that provides the optimum preheating effect, thereby reducing wasteful preheating power. This has the effect of improving comfort during heating due to faster startup due to improved preheating effect.

Effects of the Invention As is clear from the above embodiments, the compressor preheating control device for an air conditioner of the present invention is provided with a compressor stop determination means, and a compressor temperature detection means is set in advance on the outside of the compressor or in the discharge pipe. a means for comparing and calculating the set temperature, a means for determining the presence or absence of a compressor operation signal input, a means for outputting a compressor preheating signal according to these results, and a means for preheating the compressor in response to this signal. It is equipped with a frequency conversion means and controls the compressor temperature to the optimum preheating temperature range, which protects the compressor, reduces wasteful preheating power, and improves the preheating effect. This provides various advantages, such as improved comfort during heating due to faster start-up.

[Brief explanation of drawings]

FIG. 1 is a diagram corresponding to the claims of the present invention, FIG. 2 is an electric circuit diagram of a compressor preheating control device for an air conditioner according to an embodiment of the present invention, and FIG. 3 is a flowchart diagram showing the control contents.
Figure 4 is an explanatory diagram showing the relationship between compressor temperature and time, Figure 5
The diagram is of a conventional example! FIG. 6 is a flowchart of a conventional example, and FIG. 7 is an explanatory diagram showing the relationship between compressor temperature and time in a conventional example. 1... Thermistor for compressor temperature detection, 2...
... Microcomputer, a... Medium frequency changer, 4. River...
compressor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2
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Claims (1)

[Claims] Compressor stop determination means for determining whether the compressor is in operation is provided, compressor temperature detection means is provided on the compressor outer shell or discharge piping, and means for comparing and calculating the compressor temperature with a preset set temperature. and a means for determining the presence or absence of a compressor operation signal input, a means for outputting a compressor preheating signal according to the comparison calculation and determination result, and a frequency changer for receiving this signal and preheating the compressor. Compressor preheating control device.