JPH0440131Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to preheating of a compressor of an air conditioner equipped with a heat pump type refrigeration cycle.

<Prior art> As this type of air conditioner, there is an air conditioner disclosed in Japanese Utility Model Application Publication No. 60-75861, which uses an inverter that changes the rotation speed of a compressor by changing the frequency, and a setting signal that is sent to the inverter. The control device is equipped with a circuit that outputs a waveform from which pulses are partially removed, and by activating the circuit when the heating operation is stopped, the coil of the motor of the compressor can be removed without rotating the motor of the compressor. energize.

This preheats the compressor and heats the indoor fan to the temperature (approximately 32°C) at which the indoor heat exchanger of the air conditioner can start heating after turning on the operation switch when restarting the heating operation. This shortens the time it takes for the heater to start turning (hereinafter referred to as the start-up time) to heat the room more quickly.

<Problems to be solved by the invention> This conventional example can only be used in air conditioners that have a device that changes the rotation speed of the compressor using an inverter, and can be used only for air conditioners that have a device that changes the rotation speed of the compressor using an inverter. In inexpensive air conditioners that control room temperature by changing the number of air conditioners, it has not been possible to preheat the compressor in this way due to cost considerations.

<Means to solve the problems> Outdoor heat exchanger 1 to solve the problems of the conventional method
A refrigeration cycle in which a four-way valve 3 and a compressor 4 are provided in one pipe line connecting the indoor heat exchanger 2 and a pressure reducing device 5 in the other pipe line, and a detection system that measures the temperature of the refrigeration cycle or the indoor temperature or outdoor temperature. Equipped with each element of means,
In an air conditioner equipped with a control unit 6 that controls heating and cooling in relation to each of the elements, the control unit 6 starts timing upon receiving a signal to stop heating operation, and also detects the elapse of a certain period of time and the outdoor temperature. When the sensor 11 detects a temperature below a certain level, the compressor 4
The controller 6 causes the compressor 4 and the outdoor fan 7 to stop driving either when a certain period of time has elapsed or when the discharge sensor 13 detects a certain temperature, and The control unit 6 relates to an air conditioner characterized by periodically controlling ON-OFF operations of the compressor 4 and the outdoor fan 7 for a certain period of time.

<Function> During heating operation, measure the time since the operation stopped, and when the time has elapsed for more than 2 hours, at this time the outdoor temperature is 0.
℃ or below, the compressor 4 and outdoor fan 7 start operating, and the compressor temperature rapidly heats up as shown in Figure 2. At this time, the indoor fan 8 is stopped in order to prevent cold air from blowing into the room. It's stopped.

If the temperature of the compressor 4 measured by the discharge sensor 13 reaches 80°C or higher, or if the operating time of the compressor 4 exceeds 5 minutes, the compressor 4/outdoor fan 7
to stop. At this time, a timer in the control section is activated, and when one hour has elapsed, the operation of the compressor 4 and outdoor fan 7 is restarted.

By repeating this, the compressor 4 maintains the temperature within a certain range and improves the startup performance during heating operation.

〈Example〉 To explain an example shown in Fig. 3 from Fig. 1, 1
is an outdoor heat exchanger that becomes high temperature during cooling and becomes low temperature during heating, and the outdoor fan 7 performs heat exchange. Reference numeral 2 denotes an indoor heat exchanger, which has a low temperature during cooling and a high temperature during heating, and performs heat exchange with an indoor fan 8.

3 is a four-way valve for switching between heating operation and cooling operation; when it is ON, it is in heating operation, and when it is OFF, it is in cooling operation.

4 is a compressor.

5 is a pressure reducing device that uses an expansion valve or the like.

6 is a control unit that receives signals from the sensor and controls the operation of the compressor 4 and the fan.

9 is an indoor heat exchange sensor attached to the outdoor heat exchanger 1.

10 is an indoor heat exchange sensor attached to the indoor heat exchanger 2.

11 is an outside temperature sensor that measures outside temperature.

12 is a room temperature sensor that measures room temperature.

13 is a discharge sensor that measures the discharge temperature of the compressor 4.

To explain the flow of refrigerant, compressor 4 in summer
The high-temperature gas discharged is turned into a liquid by the outdoor heat exchanger 1, reduced in pressure by the pressure reducing device 5, becomes low temperature, exchanged heat with the indoor heat exchanger 2, and then returned to the compressor 4.

In winter, the high-temperature gas discharged from the compressor 4 discharges heat in the indoor heat exchanger 2 and turns into a liquid.The pressure is reduced by the pressure reducing device 5, the temperature becomes low, and the heat is exchanged with the outdoor heat exchanger 1, and the gas is transferred to the compressor 4. I'll return it.

Next, to explain the operation when the heating operation is stopped as shown in FIG. 2, when the heating operation is stopped, the control unit 6
When the internal timer is activated and the outside air temperature falls below 0°C after 2 hours, preheating operation will start, and the compressor 4 and outdoor fan 7 will start operating, and the temperature of the compressor 4 will rapidly increase. The operation of the indoor fan 8 is stopped to prevent cold air from blowing into the room. Then, when the temperature of the compressor 4 measured by the discharge sensor 13 reaches 80° C. or higher, or when the operating time of the compressor 4 reaches 5 minutes, the compressor 4 and the outdoor fan 7 are stopped.

This operation is repeated every hour. This preheating operation warms the compressor 4, and the start-up time for heating restart is significantly shortened to about 2 minutes, compared to about 5 minutes for an air conditioner that does not preheat.

In addition, in a normal air conditioner, the four-way valve switches when the heating operation is stopped, but the four-way valve switches as it is.
If you perform preheating operation every hour or every hour, the four-way valve will make a sound every time you perform preheating operation, so four-way valve 3 will always remain ON from when you switch to heating operation. It is something to do.

Furthermore, in this embodiment, the preheating starts when the outside air temperature is below 0°C, and the compressor 4 stops when the discharge sensor 13 reaches 80°C. Heat exchange sensor temperature, room temperature, etc. can also be used instead.

<Effects of the invention> As described above, according to this invention, by preheating the compressor, when heating operation is resumed, the heating start-up time can be shortened and the room can be heated quickly, which is superior to conventional inverters. An air conditioner equipped with a preheating operation function can be provided at an extremely low cost compared to the preheating mechanism of the air conditioner used.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing the refrigeration cycle of this invention. Figure 2 is a graph explaining this idea. Figure 3 is a sequence diagram of this invention. Figure 4 is a graph explaining a general air conditioner. 1...Outdoor heat exchanger, 2...Indoor heat exchanger, 3
... Four-way valve, 4 ... Compressor, 5 ... Pressure reducing device.

Claims (1)

[Scope of utility model registration request] A refrigeration cycle in which a four-way valve 3 and a compressor 4 are installed in one pipe connecting an outdoor heat exchanger 1 and an indoor heat exchanger 2, and a pressure reducing device 5 is installed in the other pipe, and the temperature of the refrigeration cycle, indoor temperature, or outdoor temperature. In an air conditioner equipped with each element of a detection means for measuring temperature, and a control unit 6 that controls heating and cooling in conjunction with each element, the control unit 6 starts timing when a signal to stop heating operation is received, and also keeps the time constant. When the time has elapsed and the outdoor temperature sensor 11 detects a temperature below a certain level, the compressor 4 and the outdoor fan 7 are driven. The drive is stopped either when a certain period of time has elapsed or when the discharge sensor 13 detects a certain temperature;
In addition, the control unit 6 turns on the compressor 4 and the outdoor fan 7.
An air conditioner characterized by periodically controlling the OFF operation for a certain period of time.