JPH04268164A - Air conditioner - Google Patents

Abstract

PURPOSE:To eliminate a preoperating time when an air conditioner is started to operate. CONSTITUTION:A temperature of a compressor 3 is detected at 4 when an air conditioner using an invertor control motor is started to operate and an increasing rate of a motor frequency is adjusted in response to the detected temperature. Since the preoperating time of the compressor is adjust to the shortest time in response to a temperature of the compressor when started, a preoperating time can be eliminated.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention adjusts the rotational speed of the compressor by controlling the frequency of the motor, and gradually increases the frequency at startup, thereby preventing the compressor from becoming unlubricated. This is related to the air conditioner.

0002

2. Description of the Related Art Compressors used in air conditioners usually use lubricating oil to lubricate the rotating parts of the cylinders and rotors that make up the pressurized chambers. Lubricating oil has a high viscosity at low temperatures, so if it rotates at high speeds at low temperatures, it will be in a state where no lubrication occurs, resulting in seizure. Therefore, in order to protect the compressor, in conventional air conditioners, even if you want to operate at full power at 130Hz when starting, for example, you run it for several minutes at 60Hz or 80Hz to increase the temperature of the lubricating oil and reduce its viscous resistance. After the power has been reduced, full power operation is started.

0003

[Problems to be Solved by the Invention] In actual operating conditions of an air conditioner, the temperature of the lubricating oil at startup differs depending on, for example, summer and winter. Additionally, if the engine is restarted immediately after stopping after a long period of operation, or if the compressor is preheated during heating operation, the temperature of the lubricating oil may have risen considerably from the beginning of operation. However, in conventional air conditioners, regardless of the actual temperature of the compressor, in order to protect the compressor, the compressor is always operated at full capacity after a certain and sufficiently long break-in operation, in accordance with the case where the compressor is started from the coldest condition. I try to drive on power. As a result, even though the compressor had warmed up sufficiently, it had to undergo an abnormally long break-in period, and it took longer than necessary to start operating at full power. Therefore, an object of the present invention is to minimize the break-in time while sufficiently protecting the compressor by adjusting the break-in time according to the temperature of the compressor at startup. Our goal is to provide air conditioners.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a compressor in an air conditioner in which the rotational speed of the compressor is controlled by frequency control and the frequency is gradually increased at the time of startup. The air conditioner is characterized by comprising a temperature sensor that detects the temperature of the air conditioner, and a control means that adjusts the degree of increase in the frequency according to the output value from the temperature sensor.

[0005]

[Operation] When the air conditioner is started, the temperature of the compressor is first detected. If this temperature is high, the break-in period may be shortened or the rotation speed during break-in may be increased; if the temperature is low, the break-in period may be prolonged or the rotation speed may be lowered, causing problems such as running out of lubricating oil. Eliminate.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention. Here, FIG. 1 is a control block diagram of an air conditioner according to an embodiment of the present invention, FIG. 2 is a flowchart showing the control procedure thereof, and FIG. 3 is a graph showing a frequency change state according to the above control procedure. The control system of the air conditioner according to this embodiment is comprised of an outdoor controller 1, an inverter circuit 2, a compressor 3, and a compressor temperature sensor 4, as shown in FIG. The outdoor controller 1 receives a signal from the compressor temperature sensor 4 when the air conditioner starts operating, and detects the temperature of the compressor. Then, in accordance with the detected temperature, an operating frequency instruction is issued to the inverter circuit 2, and the compressor 3 is driven at an appropriate frequency. In this embodiment, the detected temperature of the compressor is divided into four stages, and the degree of increase in the rotational speed of the compressor is changed stepwise for each stage. FIG. 2 is an example of a program that changes the degree of increase in the operating frequency in stages according to the temperature of the compressor, and depending on the product, the program may be further segmented or integrated. That is, for example, the detected compressor temperature T
However, as shown in Fig. 2, if the temperature is lower than the minimum reference temperature T1, a low-speed break-in operation is performed at 60 Hz for a time t1, followed by a break-in operation at 80 Hz for a time t2, and then full power operation is performed at 130 Hz. . The solid line in FIG. 3 shows the frequency change state when such a break-in operation is performed for the longest time. If the compressor temperature T is between the minimum reference temperature T1 and the slightly higher reference temperature T2, the 60Hz break-in operation is performed at (3
/4) After running for t1 hours and running in at 80Hz for (3/4)t2 hours, shift to full power.

Furthermore, the compressor temperature T is equal to the reference temperature T2.
If the reference temperature is between T3 and T2, which is higher than that, the operation at 60Hz is continued for (1/2) t1 hours, 8
Operate at 0Hz for (1/2)t2 time and then shift to full power operation. The broken line in FIG. 3 shows the frequency change in this case. When the compressor temperature T is higher than the above reference temperature T3, there is almost no need to perform a break-in operation, so the break-in operation at 60 Hz is set to (1/4) t1, and the break-in run at 80 Hz is set to (1/4) t1.
/4) After t2, immediately shift to full power operation. In this embodiment, as described above, by changing the break-in time according to the temperature of the compressor at the time of starting the air conditioner, that is, the temperature of the lubricating oil in the compressor,
Since the degree of increase in frequency is adjusted, full power operation can be started after the shortest break-in operation according to the compressor temperature.

[0008]

[Effects of the Invention] Since the present invention is constructed as described above, it is possible to minimize the time required to run-in the compressor to the temperature when starting the air conditioner, and to avoid wasteful running-in. do not have.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the control procedure.

FIG. 3 is a graph showing a frequency change state according to the above control procedure.

[Explanation of symbols]

1...Outdoor controller 2...Inverter circuit 3...Compressor 4...Compressor temperature sensor

Claims (1)

[Claims] Claim 1: An air conditioner in which the rotation speed of the compressor is controlled by frequency control and the frequency is gradually increased at startup, comprising: a temperature sensor that detects the temperature of the compressor; and a temperature sensor that detects the temperature of the compressor; An air conditioner comprising: control means for adjusting the degree of increase in the frequency according to an output value.