JPH09210519A - Control device for air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an air-conditioner to detect the mechanical contact of a compressor when the mechanical contact is detected, abnormality is displayed at a display part, and an outdoor blast fan is stopped. SOLUTION: An air-conditioner has a heat pump type refrigerating cycle formed in such a manner that a compressor 1, a four-way valve, an outdoor heat-exchanger, a pressure reducer, and an indoor heat-exchanger communicate together, in the order, and is formed such that normally, operation of the compressor is intermittently controlled, the compressor 1 comprises a mechanical contact 21 of a thermostat to disconnect a current at a given temperature, and a temperature detector 19 for the compressor 1, and when a detecting temperature therefrom exceeds a given set value, operation of the compressor 1 and the blast fan of the outdoor heat-exchanger are stopped. Further, an abnormality means 22 to detect operation of the mechanical contact inserted in the compressor 1 and an abnormality display part to display abnormality are provided. When the mechanical contact 21 of a thermostat is operated, abnormality of the compressor 1 and an outdoor blast fan is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner, and more particularly to a device for informing a control unit of the contact operation of a compressor having a mechanical contact such as a thermostat.

[0002]

2. Description of the Related Art Conventionally, as shown in a refrigeration cycle diagram of FIG. 1, a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a pressure reducer 4,
As shown in the block diagram of FIG. 7, the control device of the air conditioner including the heat pump refrigeration cycle in which the indoor heat exchanger 5 and the like are sequentially connected is an operation unit for inputting the indoor set temperature (Ts) and the like. 11, a display unit 12 that displays a set temperature and the like, and an indoor temperature detector 1 that detects an indoor temperature (Tr)
3, an air blowing fan driving unit 14 that drives the air blowing fan 7 of the indoor heat exchanger 5, an indoor control unit 15 that controls each unit in the room, and a communication unit 16 that exchanges signals with the outdoor control unit.
And the outdoor control unit 17, a blower fan drive unit 18 that drives a blower fan of the outdoor heat exchanger 3, a temperature detector 19 that detects the temperature of the compressor 1, and the compressor 1. The compressor 1 is provided with a thermostat 21 that opens and closes a power source depending on the temperature. In normal operation, the compressor 1 and the outdoor heat exchange are performed according to the difference (load) between the indoor temperature (Tr) from the indoor temperature detector 13 and the indoor set temperature (Ts) input from the operation unit 11. The blower fan 6 of the device 3 is intermittently controlled so that the room temperature (Tr) reaches the set temperature (Ts).

At this time, if the temperature of the compressor 1 rises for some reason and the temperature (Tc) detected by the temperature detector 19 exceeds a predetermined temperature (Tcs), damage to the compressor 1 is prevented, and an abnormality occurs. And the abnormality is displayed on the display unit, and the blower fan 6 of the compressor 1 and the outdoor heat exchanger 3
Has been stopped. Further, if the temperature (Tc) detected by the temperature detector 19 does not rise even if the temperature of the compressor 1 rises above a predetermined temperature (Tcs) due to a failure of the temperature detector 19, the compressor In order to prevent the damage of the compressor 1, the thermostat 21 is operated to shut off the power of the compressor 1.

However, as described above, the temperature detector 1
If there is a failure of 9 and the thermostat 21 operates and the compressor 1 stops, there is no means to know this, so it is judged as normal, no abnormality is displayed on the display unit, and the outdoor blower fan 6 also remains in operation, and there is a problem that the room temperature rises abnormally during cooling and falls abnormally during heating.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and even if a mechanical contact such as a thermostat provided in a compressor is operated, a means for detecting this is provided and an abnormality is displayed on the display section. It is intended to provide a control device for an air conditioner, which displays, and stops the outdoor blower fan.

[0006]

In order to solve the above problems, the present invention provides a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer,
And a heat pump type refrigeration cycle in which an indoor heat exchanger and the like are sequentially communicated with each other to intermittently control the operation of the compressor according to a load, and an operation unit for inputting an indoor set temperature or the like to the indoor unit A display unit that displays a set temperature, an indoor temperature detector that detects an indoor temperature, a blower fan drive unit that drives a blower fan of the indoor heat exchanger, and an indoor control unit that controls each unit in the room. The indoor unit includes an indoor control unit, an outdoor control unit, and a communication unit that transmits and receives signals.
The outdoor control unit, a blower fan drive unit that drives a blower fan of the outdoor heat exchanger, a temperature detector that detects the temperature of the compressor, and a compressor drive unit that drives the compressor. The compressor is provided with a mechanical contact such as a thermostat that opens and closes depending on the temperature, and is equipped with a temperature detector for detecting the temperature of the compressor. When the detected temperature exceeds a predetermined set value, the compressor is Abnormality detection means for detecting the operation of a mechanical contact such as a thermostat inserted in the power supply line of the compressor in an air conditioner that performs the operation of 1) and stops the blower fan of the outdoor heat exchanger to protect the compressor. When the abnormality detection means detects the operation of a mechanical contact such as a thermostat, the outdoor blower fan is stopped,
Further, an abnormality display section for displaying an abnormality is provided, and when the abnormality detection means detects the operation of a mechanical contact such as a thermostat, the outdoor blower fan is stopped and the abnormality display section displays that the compressor is abnormal. I decided to do it.

Further, the abnormality detecting means includes a pipe temperature detector for detecting a pipe temperature of the indoor heat exchanger, a gradient detecting unit for detecting a gradient of the detected temperature detected by the pipe temperature detector, and a cooling operation. Alternatively, the cooling and heating signal input section for inputting a cooling and heating signal to know that it is heating operation, and an abnormality determination section for determining an abnormality from the gradient detection signal from the gradient detection section and the cooling and heating signal from the cooling and heating signal input section, An abnormality is determined when the gradient detection signal is equal to or higher than a predetermined positive gradient value during the cooling operation, and an abnormality is determined when the gradient detection signal is equal to or lower than a predetermined negative gradient value during the heating operation.

The abnormality detecting means is composed of an ON / OFF signal input section for inputting an ON / OFF signal of the compressor, a current detecting section for detecting the current of the compressor, and an abnormality judging section. When the compressor is on, it is determined to be abnormal if the current of the compressor is not flowing.

Further, the abnormality judging section is constituted beforehand by a judgment table for storing the judgment results for the gradient detection signal and the cooling / heating signal.

Further, the abnormality display section is provided in a remote device connected to an indoor control section for controlling a blower fan of the indoor heat exchanger.

[0011]

With the above configuration, the control device for an air conditioner according to the present invention operates the compressor according to the difference (load) between the room temperature (Tr) and the set temperature (Ts). By turning on and off, the room temperature (Tr) is changed to the set temperature (T
When the temperature detected by the compressor exceeds a predetermined set value, the blower fans of the compressor and the outdoor heat exchanger are stopped to perform the protective operation of the compressor. If a mechanical contact such as a thermostat is activated even if the temperature detector etc. fails, the abnormality detecting means will detect an abnormality from the pipe temperature gradient detection signal and the cooling / heating signal of the indoor heat exchanger, or the compressor operation An abnormality is detected by detecting interruption of the power supply current inside, and the abnormality is displayed on the display unit, and the outdoor blower fan is stopped.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air conditioner control apparatus according to the present invention will be described below in detail with reference to the drawings. 1 is a refrigeration cycle diagram of an air conditioner according to the present invention, FIG. 2 is a block diagram showing an embodiment of a control device for an air conditioner according to the present invention, and FIGS. 3 and 4 are control devices for an air conditioner according to the present invention. 3 is a partial block diagram of FIG. As shown in the refrigeration cycle diagram of FIG. 1, air having a heat pump type refrigeration cycle in which a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a pressure reducer 4, an indoor heat exchanger 5 and the like are sequentially connected. As shown in the block diagram of FIG. 2, the control device for the harmony machine includes an operation unit 11 for inputting an indoor set temperature (Ts) and a display unit 12 for displaying the set temperature and the like.
And an indoor temperature detector 13 for detecting the indoor temperature (Tr)
An indoor blower fan drive unit 14 that drives the indoor blower fan 7 of the indoor heat exchanger 5, an indoor control unit 15 that controls each unit in the room, and a communication unit 16 that exchanges signals with the outdoor control unit. The outdoor control unit 17 and the outdoor heat exchanger 3
An outdoor blower fan drive unit 18 for driving the blower fan of
The compressor 1 has a thermostat 2 which opens and closes depending on the temperature.
1, and a temperature detector 19 for detecting the temperature of the compressor 1.
And a compressor drive unit 20 that drives the compressor 1, and an abnormality detection unit 22 that detects an abnormality of the compressor.

Further, as shown in FIG. 3, the abnormality detecting means 22 detects the pipe temperature detector 24 for detecting the pipe temperature (Tp) of the indoor heat exchanger 5 and the pipe temperature detector 24 for detecting the pipe temperature (Tp). A gradient detection unit 22a that detects the gradient (ΔTp) of the detected temperature (Tp), and a cooling / heating signal input unit 22b that inputs a cooling / heating signal that indicates cooling or heating operation.
And a gradient detection signal (SΔ) from the gradient detector 22a
And the cooling / heating signal (Sc /
w) and an abnormality determination unit 22c for determining an abnormality,
Abnormal if the gradient detection signal (SΔ) is greater than or equal to a predetermined positive gradient value (SΔ> + S) during cooling operation, and the gradient detection signal (SΔ) is a predetermined negative gradient value (SΔ <−S) during heating operation.
If it is below, it is determined to be abnormal.

Further, the abnormality detecting means 22 is, as shown in FIG. 4, a current detecting section 2 for detecting the current of the compressor 1.
3 and an on / off signal for inputting the on / off signal of the compressor 1.
It is composed of an off signal input unit 22d and an abnormality determination unit 22e, and when the compressor 1 is on, it is determined to be abnormal if the current of the compressor 1 is not flowing.

The operation of the above configuration will now be described. In normal operation, the indoor temperature detector 1
3, the blower fan 6 of the compressor 1 and the outdoor heat exchanger 3 is intermittently turned on and off according to the difference (load) between the indoor temperature (Tr) from 3 and the indoor set temperature (Ts) input from the operation unit 11. The temperature (Tr) is controlled so as to reach the set temperature (Ts).

FIG. 6 is an operation flow for explaining the operation of detecting an abnormality of the compressor. Hereinafter, description will be made with reference to FIG. The temperature of the compressor 1 rises for some reason, and the temperature (Tc) detected by the temperature detector 19 is a predetermined temperature (Tcs).
When it exceeds (ST1), in order to prevent damage to the compressor 1, it is judged as abnormal and the abnormality is displayed on the display unit (ST6), and the sending fan 6 of the compressor 1 and the outdoor heat exchanger 3 is sent.
Is stopped (ST7). Further, due to a failure of the temperature detector 19 or the like, the temperature of the compressor 1 becomes a predetermined temperature (Tc
s) or more, the temperature detected by the temperature detector 19 (T
When c) does not rise, the thermostat 21 operates to shut off the power source of the compressor 1 in order to prevent the compressor 1 from being damaged.

As described above, the thermostat 2
When the compressor 1 is activated and the power of the compressor 1 is cut off, in the case of the embodiment of FIG. 3, the pipe temperature (Tp) of the indoor heat exchanger 5 suddenly changes as shown in FIG. Pipe temperature (T
p) is detected by the pipe temperature detector 24 (ST3, ST9)
Then, the gradient detection unit 22a detects the gradient (ΔTp) of the pipe detection temperature (Tp), and the cooling / heating signal (Sc / w) input from the cooling / heating signal input unit 22b indicates whether the cooling operation is in progress (ST
2) or during heating operation (ST8), it is abnormal if the gradient detection signal (SΔ) is a predetermined positive gradient value (SΔ> + S) or more (ST4) during cooling operation, and
The abnormality determination unit 22c determines (ST5) that there is an abnormality when the gradient detection signal (SΔ) is less than or equal to a predetermined negative gradient value (SΔ <−S) (ST10) during the heating operation.

Further, in the case of the embodiment of FIG. 4, the current detection signal (Scur) of the compressor 1 from the current detection unit 23.
And the on / off signal (Son / off) of the compressor 1 from the on / off signal input unit 22d.
When the compressor 1 is turned on, e is determined to be abnormal if the current of the compressor 1 is not flowing.

As described above, when it is found that the thermostat 21 is activated and the power of the compressor 1 is shut off, the display unit 12 displays that the compressor 1 is abnormal and the outdoor blower fan 6 is turned on. I'm trying to stop.

[0020]

As described above, according to the control device for an air conditioner of the present invention, the compressor of the compressor is normally operated according to the difference (load) between the room temperature (Tr) and the set temperature (Ts). By controlling the indoor temperature (Tr) to reach the set temperature (Ts) by interrupting the operation, and when the detected temperature of the compressor exceeds a predetermined set value, the blower fan of the compressor and the outdoor heat exchanger is controlled. The operation is stopped to protect the compressor,
Even if the temperature detector of the compressor fails, if the mechanical contact such as the thermostat operates, the abnormality detecting means detects an abnormality from the gradient detection signal and the heating / cooling signal of the pipe temperature of the indoor heat exchanger, or An abnormality is detected by detecting the interruption of the power supply while the machine is operating.The abnormality is displayed on the display and the outdoor blower fan is stopped.Therefore, a mechanical device such as a thermostat installed in the compressor is used. It is possible to provide a control device for an air conditioner, which is provided with means for detecting the contact even if the contact operates, displays an abnormality on the display unit, and stops the outdoor blower fan.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to the related art or the present invention.

FIG. 2 is a block diagram showing one embodiment of a control device for an air conditioner according to the present invention.

FIG. 3 is a partial block diagram showing an embodiment of abnormality detecting means of the control device for an air conditioner according to the present invention.

FIG. 4 is a partial block diagram showing another embodiment of the abnormality detecting means of the control device for an air conditioner according to the present invention.

FIG. 5 is a temperature change diagram of the indoor heat exchanger for explaining the operation of the abnormality detecting means when the compressor is stopped.

FIG. 6 is an operation flow of abnormality detecting means of the control device for an air conditioner according to the present invention.

FIG. 7 is a block diagram of a conventional air conditioner control device.

[Explanation of symbols]

 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Pressure reducer 5 Indoor heat exchanger 6 Outdoor blower fan 7 Indoor blower fan 11 Operation part 12 Display part 13 Indoor temperature detector 14 Indoor blower fan drive part 15 Indoor control part 16 Communication Part 17 Outdoor control part 18 Outdoor blower fan drive part 19 Temperature detector 20 Compressor drive part 21 Thermostat 22 Abnormality detection means 22a Gradient detection part 22b Cooling and heating signal input part 22c Abnormality judgment part 22d Compressor on / off signal input part 22e Abnormality Judgment unit 23 Current detection unit 24 Pipe temperature detector

Claims (6)

[Claims] 1. A heat pump type refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger and the like are sequentially connected, and the operation of the compressor is intermittently controlled according to a load. In the indoor unit, an operation unit for inputting an indoor set temperature and the like, a display unit for displaying the set temperature and the like, an indoor temperature detector for detecting the indoor temperature, and a blower fan for the indoor heat exchanger. A blower fan drive unit that drives the
An indoor control unit that controls each unit in the room, a communication unit that transmits and receives signals to and from the indoor control unit, the outdoor control unit, and the outdoor unit includes the outdoor control unit and a blower fan for the outdoor heat exchanger. A blower fan drive unit that drives, a temperature detector that detects the temperature of the compressor, and a compressor drive unit that drives the compressor are provided, and the compressor is a machine such as a thermostat that opens and closes according to the temperature. Equipped with a dynamic contact and a temperature detector that detects the temperature of the compressor, and when the detected temperature exceeds a preset value, the compressor is stopped and the blower fan of the outdoor heat exchanger is stopped. In an air conditioner that performs a protective operation of the machine, an abnormality detection means for detecting the operation of a mechanical contact such as a thermostat inserted in the power line of the compressor is provided, and the abnormality detection means is provided for the mechanical contact such as a thermostat. Actuation When output control device for an air conditioner characterized by comprising so as to stop the outdoor blower fan. 2. A heat pump type refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger and the like are sequentially connected, and the operation of the compressor is intermittently controlled according to a load. In the indoor unit, an operation unit for inputting an indoor set temperature and the like, a display unit for displaying the set temperature and the like, an indoor temperature detector for detecting the indoor temperature, and a blower fan for the indoor heat exchanger. A blower fan drive unit that drives the
An indoor control unit that controls each unit in the room, a communication unit that transmits and receives signals to and from the indoor control unit, the outdoor control unit, and the outdoor unit includes the outdoor control unit and a blower fan for the outdoor heat exchanger. A blower fan drive unit that drives, a temperature detector that detects the temperature of the compressor, and a compressor drive unit that drives the compressor are provided, and the compressor is a machine such as a thermostat that opens and closes according to the temperature. Equipped with a dynamic contact and a temperature detector that detects the temperature of the compressor, and when the detected temperature exceeds a preset value, the compressor is stopped and the blower fan of the outdoor heat exchanger is stopped. In an air conditioner that performs a protective operation of a machine, an abnormality detection unit that detects the operation of a mechanical contact such as a thermostat inserted in the power line of the compressor and an abnormality display unit that displays an abnormality are provided to detect the abnormality. The means is thermo Upon detection of the operation of mechanical contacts such as Tat stops the outdoor blower fan, compressor control unit of the air conditioner characterized by comprising as displayed on the abnormality display unit that is abnormal. 3. The abnormality detecting means, a pipe temperature detector for detecting a pipe temperature of the indoor heat exchanger, a gradient detector for detecting a gradient of the detected temperature detected by the pipe temperature detector, and a cooling operation. Alternatively, the cooling and heating signal input section for inputting a cooling and heating signal to know that it is heating operation, and an abnormality determination section for determining an abnormality from the gradient detection signal from the gradient detection section and the cooling and heating signal from the cooling and heating signal input section, When the gradient detection signal is equal to or higher than a predetermined positive gradient value during the cooling operation, it is determined to be abnormal, and when the gradient detection signal is equal to or lower than the predetermined negative gradient value during the heating operation, it is determined to be abnormal. The control device for an air conditioner according to claim 1 or 2. 4. The abnormality detecting means comprises an ON / OFF signal input section for inputting an ON / OFF signal of the compressor, a current detecting section for detecting a current of the compressor, and an abnormality determining section. The control device for an air conditioner according to claim 1 or 2, wherein when the compressor is on, it is determined to be abnormal if the current of the compressor is not flowing. 5. The control device for an air conditioner according to claim 3, wherein the abnormality determination unit is configured by a determination table that stores determination results for the gradient detection signal and the cooling / heating signal in advance. 6. The control device for an air conditioner according to claim 2, wherein the abnormality display unit is provided in a remote device that is connected to an indoor control unit that controls a blower fan of the indoor heat exchanger.