JP3613862B2 - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an abnormal increasing in temperature of a coil in a compressor in advance and further to prevent the compressor from being damaged by a method wherein an operation of the compressor is stopped in the case that the compressor has caused an inverse rotation due to a power failure. SOLUTION: In the case that an operating time of a compressor elapses a set value of operating time and a temperature difference between an indoor air temperature and an indoor pipe temperature is less than a temperature difference set value at a step 115, the elapsing time at that state is detected by a time counter at a step 117 and if the elapsing time is more than a set value of the temperature difference time at a step 118, the compressor is stopped at a step 119.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for preventing breakage of a compressor in an air conditioner.
[0002]
[Prior art]
In a conventional air conditioner, the compressor may reverse when the supply power supply causes a momentary power failure, and the compressor may continue to operate in the reverse state.
[0003]
[Problems to be solved by the invention]
However, in the conventional air conditioner described above, when the operation is continued with the compressor reversed, the coil temperature of the compressor rises abnormally and breaks.
[0004]
An object of the present invention is to solve the problems of the conventional example.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is provided with a control means for detecting the state of the compressor when the compressor reverses and stopping the compressor. And the reverse rotation continuation of the compressor can be stopped.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, when the compressor is reversely rotated, the state is detected and the compressor is stopped, thereby preventing the compressor from being damaged due to the reverse rotation.
[0007]
The means for detecting the reverse rotation of the compressor can detect the reverse rotation state based on the temperature difference between the temperature by the indoor temperature detection means and the temperature by the indoor pipe temperature detection means.
[0008]
Therefore, it is possible to detect only with the components used in the conventional air conditioner, and it is possible to quickly detect the reverse rotation state and to stop the reverse rotation.
[0009]
Further, since the temperature difference between the room temperature and the room piping temperature is lower than the set value for a certain period from the start of the operation of the air conditioner, the malfunction of the control is prevented by not stopping the compressor during that period.
[0010]
Also, when the operating condition of the air conditioner changes, the temperature difference between the room temperature and the room piping temperature temporarily falls below the set value, but the compressor is stopped if the temperature difference remains below the set value for a certain period of time. By doing so, the control is prevented from malfunctioning.
[0011]
Although the present invention can be implemented by the operation of the present invention described above, specific examples will be described below.
[0012]
【Example】
Hereinafter, an embodiment of an air conditioner according to the present invention will be described with reference to the drawings.
[0013]
FIG. 5 shows a refrigeration cycle of the air conditioner. The refrigerant discharged from the compressor 201 is sucked into the four-way valve 202, the condenser 203, the capillary tube 204, the evaporator 205 and the flow compressor 201. Reference numeral 206 denotes indoor temperature detection means, and reference numeral 207 denotes indoor pipe temperature detection means.
[0014]
Example 1
In FIG. 1, the information taken into the control system is the room temperature and the room piping temperature.
[0015]
First, the operation time determination circuit 1 compares the accumulated operation time with the operation time set value 2, and if the accumulated operation time is equal to or greater than the operation time set value 2, information on the room temperature and the indoor pipe temperature is obtained from the room temperature detecting means 3, The temperature difference between the indoor temperature detection means 3 and the indoor pipe temperature detected by the indoor pipe temperature detection means 4 is calculated by the temperature difference calculation means 5 from the indoor pipe temperature detection means 4 into the control system. The comparison means 6 compares with the temperature difference set value 7 and if the temperature difference set value 7 or less, the compressor stop means 8 stops the compressor 9.
[0016]
FIG. 2 is a flowchart showing this control flow.
If the operation time T is detected in step 101 and the relationship between the operation time T and the operation time set value Ts is established as T ≧ Ts in step 102, the indoor temperature t1 is read in step 103, and the indoor piping temperature t2 is determined in step 104. Read. Then, in step 105, the temperature difference t between t1 and t2 is calculated. In step 106, if the relationship between the temperature difference t and the temperature difference set value ts satisfies t ≦ ts, the compressor is stopped in step 107.
[0017]
(Example 2)
In FIG. 3, the information taken into the control system is the room temperature and the room piping temperature.
[0018]
First, the operation time determination circuit 11 compares the accumulated operation time with the operation time set value 12, and if the accumulated operation time is equal to or greater than the operation time set value 12, information on the room temperature and the indoor pipe temperature is obtained from the room temperature detecting means 13, The temperature difference between the indoor temperature and the indoor pipe temperature obtained from the indoor temperature detecting means 13 and the indoor pipe temperature detecting means 14 is calculated by the temperature difference calculating means 15 from the indoor pipe temperature detecting means 14 into the control system. The comparison means 16 compares with the temperature difference set value 17 and if the temperature difference set value is 17 or less, the time counter 18 detects the elapsed time when the temperature difference is less than the temperature difference set value 17 and The elapsed time is compared with the elapsed time set value 20 by the time comparison means 19, and if the elapsed time exceeds the elapsed time set value 20, the compressor 22 is stopped by the compressor stop means 21.
[0019]
FIG. 4 is a flowchart showing this control flow.
If the operation time T is detected in step 111 and the relationship between the operation time T and the operation time set value Ts is established as T ≧ Ts in step 112, the indoor temperature t1 is read in step 113, and the indoor piping temperature t2 is determined in step 114. Read. Then, in step 115, the temperature difference t between t1 and t2 is calculated, and if the relationship between the temperature difference t and the temperature difference set value ts satisfies t ≧ ts in step 116, the time counter 18 passes the above t ≧ ts state. The time Ta is detected in step 117, and if the relationship between the Ta and the temperature difference time set value Tc is established in step 118 as Ta ≧ Tc, the compressor is stopped in step 119.
[0020]
【The invention's effect】
The present invention detects the reverse rotation state of the compressor and stops the compressor, thereby preventing an abnormal temperature rise of the coil of the compressor and preventing the compressor from being destroyed.
[0021]
In addition, when the compressor reverses, it can be detected only by the parts used in the conventional air conditioner by detecting the state based on the temperature difference between the indoor temperature and the indoor piping temperature, and a new cost It is possible to perform this control without applying an error, and it is possible to quickly detect the reverse rotation state.
[0022]
Further, although the temperature difference between the room temperature and the room piping temperature is lower than the set value for a certain period of time after the start of the operation of the air conditioner, it is possible to prevent the control from malfunctioning by not stopping the compressor during that time.
[0023]
Also, when the operating condition of the air conditioner changes, the temperature difference between the room temperature and the indoor piping temperature temporarily falls below the set value, but the compressor is stopped if the temperature difference remains below the set value for a certain period of time. Therefore, it is possible to prevent the control from malfunctioning, and it is possible to prevent the compressor from being damaged due to the reverse rotation.
[Brief description of the drawings]
FIG. 1 is a block diagram of a compressor reverse rotation prevention control according to a first embodiment of the present invention. FIG. 2 is a flowchart of a compressor reverse rotation prevention control according to the first embodiment of the present invention. FIG. 4 is a flowchart of reverse rotation prevention control of the compressor. FIG. 5 is an explanatory diagram of a refrigeration cycle of an air conditioner according to the present invention.
1,11 Operating time determination circuit 2,12 Operating time set value 3,13 Indoor temperature detecting means 4,14 Indoor piping temperature detecting means 5,15 Temperature difference calculating means 6,16 Temperature difference comparing means 7,17 Temperature difference setting value 8, 21 Compressor stop means 9, 22 Compressor 18 Time counter 19 Elapsed time comparison means 20 Elapsed time set value

Claims (3)

In an air conditioner having a compressor, a condenser, and an evaporator and capable of cooling and heating, an indoor temperature detecting means for detecting an indoor temperature, an indoor pipe temperature detecting means for detecting an indoor pipe temperature, and the indoor temperature A calculating means for calculating a temperature difference between the indoor temperature detected by the detecting means and the indoor pipe temperature detected by the indoor pipe temperature detecting means; and comparing the temperature difference with a predetermined temperature difference set value; An air conditioner comprising: control means for stopping the compressor when the temperature difference is equal to or less than a set value . The control means detects an operation time from the start of operation of the air conditioner, and performs control so that the compressor is not stopped when the detected operation time is within a predetermined operation time. The air conditioning apparatus described. The control means detects an elapsed time when the temperature difference is not more than the temperature difference set value when the temperature difference is not more than the temperature difference set value, and when the elapsed time is not less than a predetermined elapsed time set value, the compressor The air conditioner according to claim 1, wherein the air conditioner is controlled so as to be stopped .

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