JPH05248740A - Operation controller for air conditioner - Google Patents

Abstract

PURPOSE:To detect abnormality accurately on the basis of the number of operations of a high-pressure switch during the entire period of time of operation. CONSTITUTION:A high-pressure switch HPS is provided which outputs a high-pressure signal when the pressure of a high-pressure refrigerant on the outlet side of a compressor 1 rises higher than a specified value. A high-pressure stopping means 11 is provided which stops temporarily the operation of the compressor 1 and then resumes it when the high-pressure switch HPS outputs the high-pressure signal. A decision means 12 is provided which outputs a short time signal in the case where an output interval between the output time of the preceding high-pressure signal from the high-pressure switch HPS and the output time of the present high-pressure signal therefrom is within a specified period of time, and outputs a long time signal in the case where said interval is longer than a predetermined period of time. An adding means 14 is provided which adds one to a counter 13 when the decision means 12 outputs the short time signal, and a subtracting means 15 is also provided which subtracts one from the counter 13 when the decision means 12 outputs the long time signal. An abnormality processing means 16 is provided which performs abnormality processing when the counter 13 shows a specified value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for an air conditioner, and more particularly to measures against high pressure abnormality.

[0002]

2. Description of the Related Art Generally, in an air conditioner, a compressor, an outdoor heat exchanger, a pressure reducing mechanism and an indoor heat exchanger are sequentially connected as disclosed in Japanese Utility Model Publication No. 2-5315. There is a compressor in which a refrigerant circuit is formed and a high-pressure pressure switch for detecting a high-pressure refrigerant pressure is provided on the discharge side of the compressor.

When the pressure of the high-pressure refrigerant exceeds a predetermined value, there may be a transient high-pressure rise such as gusts.
After stopping the operation of the compressor, when a predetermined time has passed,
A retry process for restarting the operation of the compressor is performed. On the other hand, the high-pressure switch is 3 in 10 minutes.
Since the abnormal operation such as the failure of the outdoor fan may be required when the operation is repeated, the air conditioning operation is stopped and the abnormal lamp is turned on.

[0004]

In the above air conditioner, if the high pressure switch is not activated three times within 10 minutes after the high pressure switch is activated once, the counter for 10 minutes is cleared. Therefore, if the high-pressure switch is operating every predetermined time, for example, 15
When the high pressure switch is operating every minute, it is determined that the operation is normal.

As a result, in all operating states of the thermo-on state, even if the high pressure switch is operated a plurality of times and maintenance is required, the air conditioning operation is continued and the abnormality can be accurately detected. There was a problem that it could not be done and was inferior in reliability.

The present invention has been made in view of the above problems, and it is intended to detect an abnormality from the number of times of operation of the high-voltage detecting means for the entire operating time so that normal abnormality can be detected. It is intended.

[0007]

In order to achieve the above object, the means taken by the present invention is to count the number of outputs of the high voltage detecting means with reference to each output interval of the high voltage detecting means. Is.

Concretely, as shown in FIG. 1, the means taken by the invention according to claim 1 is as follows. First, a compressor (1), a heat source side heat exchanger (3), and an expansion mechanism (5). And the heat exchanger on the use side (6)
It is premised on an air conditioner provided with a refrigerant circuit (9) in which and are connected in order.

Then, the high pressure refrigerant pressure on the discharge side of the compressor (1) is detected, and when the high pressure refrigerant pressure rises to a predetermined value or more, a high pressure detection means (HPS) for outputting a high pressure signal,
When the high pressure detecting means (HPS) outputs a high voltage signal, the compressor
A high pressure stop means (11) is provided for temporarily stopping the operation of (1) and then restarting the operation of the compressor (1). Further, when the high-voltage detection means (HPS) outputs a high-voltage signal, the counting means (13) for counting the number of times the high-voltage signal output by the high-voltage detection means (HPS) outputs the high-voltage signal at the time of the previous high-voltage signal output. From the current output of the high voltage signal to the determination unit that outputs the short time signal if the output interval is within the predetermined time
(12) and are provided. In addition, when the judging means (12) outputs a short time signal, an adding means (14) for adding 1 to the count value of the counting means (13) and the counting means (1
When the count value of 3) becomes a predetermined value, the abnormality processing means (1
6) and are provided.

The means taken by the invention according to claim 2 is the judging means (12) in the invention according to claim 1 above.
When the high voltage detection means (HPS) outputs a high voltage signal, it outputs a short time signal if the output interval is within the predetermined time from the output of the previous high voltage signal to the output of this high voltage signal. Is configured to output a long time signal when the time is longer than a predetermined time, and when the determination means (12) outputs the long time signal, subtraction means (15) for subtracting 1 from the count value of the counting means (13). Is provided.

The means taken by the invention according to claim 3 is the determination means in the invention according to claim 1 or 2 above.
The predetermined time of (12) is after the compressor (1) is driven
The time is set until the drive in (1) becomes stable.

[0012]

With the above structure, in the invention according to claim 1,
First, in the refrigerant circuit (9), for example, the liquid refrigerant condensed and liquefied in the heat source side heat exchanger (3) is decompressed by the expansion mechanism (5) and then evaporated in the use side heat exchanger (6). Then it returns to the compressor (1).

During this air conditioning operation, the high pressure detecting means (H
PS) monitors the high pressure refrigerant pressure on the discharge side of the compressor (1), and the high pressure detection means (HPS) outputs a high pressure signal when the high pressure refrigerant pressure rises above a predetermined pressure. ..
When the high pressure detecting means (HPS) outputs a high pressure signal, the high pressure stopping means (11) stops the driving of the compressor (1). After that, the determination means (12) outputs the high-voltage signal last time until the current high-voltage signal is output for a predetermined time, that is, in the invention according to claim 3, the operation of the compressor (1) is stabilized. For example, it is determined whether the time is within 30 minutes.
Then, when the output interval is within 30 minutes, the determining means (12) outputs a short time signal, and in the invention according to claim 2, the determining means when the output interval is longer than 30 minutes. (12) will output a long time signal.

Therefore, when the judging means (12) outputs the short time signal, the adding means (14) adds 1 to the count value CHP of the counting means (13). On the other hand, claim 2
According to the invention of claim 1, when the judging means (12) outputs the long time signal, the subtracting means (15) subtracts 1 from the count value CHP of the counting means (13).

Thereafter, it is judged whether or not the count value CHP of the counting means (13) has reached 5, and the counting means (13) has a predetermined value,
For example, when it is not 5, the air conditioning operation is restarted.

On the other hand, the count value CHP of the counting means (13) is 5
Then, the abnormality processing means (16) stops driving the compressor (1) to stop the air conditioning operation, and performs abnormality processing such as lighting of an abnormality lamp.

[0017]

Therefore, according to the invention of claim 1,
When the high-pressure detection means (HPS) detects an excessive rise in the high-pressure refrigerant pressure and the output interval of the high-voltage signal of the high-pressure detection means (HPS) is within a predetermined time, the coefficient value of the counting means (13) is added. As a result, the air-conditioning operation can be continued for a temporary increase in high pressure, so that comfort can be improved.

Further, since it is possible to accurately detect only the high pressure rise that occurs repeatedly from the entire air conditioning operation,
The reliability of operation control can be improved.

According to the second aspect of the present invention, when the output interval of the high voltage signal is longer than the predetermined time, the coefficient value of the counting means (13) is subtracted, so that only the high voltage rise that occurs repeatedly is more accurate. Therefore, the reliability of the operation control can be further improved.

Further, according to the invention of claim 3, the predetermined time of the judging means (12) is set to the time from the driving of the compressor (1) to the stabilization of the driving. It is possible to reliably determine whether or not there is a high pressure increase in sex.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 2 shows a refrigerant piping system of an air conditioner to which the present invention is applied, which is a so-called separate type in which one indoor unit (B) is connected to one outdoor unit (A). Is.

The outdoor unit (A) includes a scroll type compressor (1) whose operating frequency is variably adjusted by an inverter, and a solid line in the figure during cooling operation and a broken line in the figure during heating operation. Four-way switching valve to replace (2)
And an outdoor heat exchanger that is a heat source side heat exchanger that functions as a condenser during cooling operation and as an evaporator during heating operation.
(3), a decompression section (20) for decompressing the refrigerant, and a compressor
An accumulator (7) for removing the liquid refrigerant in the suction refrigerant, which is provided in the suction pipe of (1), is arranged as a main device. Further, the indoor unit (B) is provided with an indoor heat exchanger (6) which is a utilization side heat exchanger that functions as an evaporator during cooling operation and as a condenser during heating operation. The compressor (1), the four-way switching valve (2), the outdoor heat exchanger (3), the pressure reducing section (20), the indoor heat exchanger (6), and the accumulator (7) are connected to the pipe ( 8) are connected sequentially,
A refrigerant circuit (9) is configured so that heat is transferred by circulating the refrigerant.

Here, the decompression section (20) includes a bridge-shaped rectifier circuit (8a) and a pair of connection points in the rectifier circuit (8a).
A common path (8a) connected to (P, Q), and the common path (8a)
Includes a receiver (4) for storing the liquid refrigerant, an auxiliary heat exchanger (3a) for the outdoor heat exchanger (3), and an electric expansion mechanism that is an expansion mechanism that has a pressure reducing function and a flow rate adjusting function for the liquid refrigerant. Valve (5)
And are arranged in series. And the rectifying circuit (8a)
The other pair of connection points (R, S) in the
The piping (8) on the (3) side and the piping (8) on the indoor heat exchanger (6) side are connected. Furthermore, the rectifier circuit (8a) connects the upstream connection point (P) of the common path (8a) and the connection point (S) of the outdoor heat exchanger (3) side from the external heat exchanger (3). Indoor heat exchange with the first inflow passage (8b1) equipped with the first check valve (D1) that allows only refrigerant flow to the receiver (4), the upstream connection point (P) of the common passage (8a) The indoor heat exchanger (6) is connected to the connection point (R) on the side of the heat exchanger (6).
Second inflow path (8b2) equipped with a second check valve (D2) that allows only the flow of refrigerant from the receiver to the receiver (4), the downstream connection point (Q) of the common path (8a) and the indoor heat A first check valve (D3) that connects the connection point (R) on the exchanger (6) side and allows only the refrigerant to flow from the electric expansion valve (5) to the indoor heat exchanger (6). Outflow channel (8
c1), the downstream side connection point (Q) of the common path (8a) and the connection point (S) on the outdoor heat exchanger (3) side, and the electric expansion valve (5) to the outdoor heat exchanger (3). The second outflow passage (8c2) provided with the fourth check valve (D4) which allows only the refrigerant flow to (4).

In addition, the common path (8
Between both connection points (P, Q) in a), the capillary tube (C)
A liquid seal prevention bypass passage (8f) is provided,
The liquid seal prevention bypass passage (8f) prevents liquid seal when the compressor (1) is stopped, while opening and closing between the upper part of the receiver (4) and the downstream side of the common passage (8a). A degassing passage (4a) equipped with a valve (SV) is connected. The degree of pressure reduction of the capillary tube (C) is set to be sufficiently higher than that of the electric expansion valve (5), and the function of adjusting the refrigerant flow rate by the electric expansion valve (5) during normal operation is maintained well. It is designed to be profitable.

Further, (F1 to F4) are filters for removing dust in the refrigerant, and (ER) is a silencer for reducing the operation noise of the compressor (1).

Further, the air conditioner is provided with sensors, and (Thd) is a discharge pipe sensor (Tha) arranged in the discharge pipe of the compressor (1) for detecting the discharge pipe temperature Td. Is
An outdoor suction sensor, which is located at the air suction port of the outdoor unit (A) and detects the suction air temperature Ta, which is the outside air temperature, (Thc)
Is located in the outdoor heat exchanger (3) and is an external heat exchange sensor that detects the external heat exchange temperature Tc that is the condensation temperature during cooling operation and the evaporation temperature during heating operation, and (Thr) is the indoor unit
The indoor suction sensor, which is located at the air inlet of (B) and detects the intake air temperature Tr that is the room temperature, (The) is located at the indoor heat exchanger (6), and becomes the evaporation temperature during cooling operation. An internal heat exchange sensor that detects the internal heat exchange temperature Te that becomes the condensation temperature during heating operation, (HPS) detects the high pressure refrigerant pressure and turns on due to the excessive increase of the high pressure refrigerant pressure to output a high pressure signal. High pressure switch which is a high pressure detection means, (L
PS) is a low-pressure pressure switch that detects the low-pressure refrigerant pressure and turns on when the low-pressure refrigerant pressure is excessively low to output a low-pressure signal.

The output signals of the sensors (Thd, ..., The) and the switches (HPS, LPS) are output to the controller (10).
The controller (10) is configured to control the air conditioning operation based on the input signal.

In the above-mentioned refrigerant circuit (9), during the cooling operation, the liquid refrigerant condensed and liquefied in the outdoor heat exchanger (3) flows from the first inflow passage (8b1), and the first check valve (D1). ) And then stored in the receiver (4), decompressed by the electric expansion valve (5), then evaporated in the indoor heat exchanger (6) through the first outflow path (8c1) and returned to the compressor (1). While circulating, during heating operation,
Liquid refrigerant condensed and liquefied in the indoor heat exchanger (6) flows in from the second inflow path (8b2), passes through the second check valve (D2), and is received.
After being stored in (4) and decompressed by the electric expansion valve (5), the second
Compressor by evaporating in the outdoor heat exchanger (3) via the outflow passage (8c2)
The cycle returns to (1).

On the other hand, the controller (10) is characterized by a high voltage stopping means (11), a judging means (12), a counter, an adding means (14), a subtracting means (15), and an abnormality processing means (characteristic). 16)
And are provided. When the high-pressure refrigerant pressure rises excessively and the high-pressure pressure switch (HPS) outputs a high-pressure signal, the high-pressure stop means (11) stops the operation of the compressor (1) to bring it into a thermo-off state, and a predetermined time elapses. A retry process for restarting the operation of the compressor (1) is performed later.

The counter (13) has a high pressure switch (H
It constitutes a counting means for counting the number of times the high-voltage signal output by PS) is output. When the high pressure signal (HPS) outputs a high pressure signal, the determination means (12) determines whether the output interval is within a predetermined time from the output of the previous high pressure signal to the output of the current high pressure signal. Judgment, for example, 30
It is configured to determine whether or not it is within a minute, and to output a short time signal when the output interval is within 30 minutes, and to output a long time signal when the output interval is longer than 30 minutes. The 30 minutes of the judging means (12) is set based on the time from the start of driving of the compressor (1) until the driving is stabilized.

The adding means (14) is configured to add 1 to the count value CHP of the counter (13) when the judging means (12) outputs a short time signal. Also,
The subtracting means (15) is configured to subtract 1 from the count value CHP of the counter (13) when the judging means (12) outputs a long time signal. In other words, one high voltage signal output in the state where the drive of the compressor (1) is stable 30 minutes after the output of the previous high voltage signal is
Since it is considered to be a temporary rise in high pressure, the above counter (13)
The count value CHP is subtracted.

Further, the abnormality processing means (16) is a counter.
When the count value CHP of (13) reaches a predetermined value, for example, 5 times, the air conditioning operation is stopped instead of the high pressure stop means (11), and abnormality processing such as lighting of an abnormality lamp is performed. ing.

Next, the operation control operation when the high pressure refrigerant pressure rises excessively will be described based on the control flow of FIG.

First, during air conditioning operation such as cooling, the high pressure switch (HPS) monitors the high pressure refrigerant pressure on the discharge side of the compressor (1), and the high pressure switch (HPS)
When the high pressure refrigerant pressure rises above a predetermined pressure, a high pressure signal is output. Then, when the high voltage signal is output, the HPS operation control is started.

Therefore, when the high pressure switch (HPS) outputs a high pressure signal, in step ST1, the frequency off circuit is controlled, that is, the high pressure stopping means (11) stops the driving of the compressor (1). At the same time, the outdoor fan etc. is temporarily stopped. After that, the process proceeds to step ST2, and the determination means (1
2) determines whether the output interval from the previous output of the high voltage signal to the output of the current high voltage signal is within 30 minutes. If the output interval is within 30 minutes, the judging means (12) outputs a short time signal and the step ST
The determination of 3 is NO, and the process proceeds to step ST3. Also, the output interval of the high pressure switch (HPS) is 3
If it is longer than 0 minutes, the determination means (12) outputs a long time signal and the determination in step ST2 is YES,
The process moves from step ST2 to step ST4.

Therefore, in step ST3, the adding means (14) adds 1 to the count value CHP of the counter (13),
That is, the excessive increase in the high-pressure refrigerant pressure has occurred in a short time, so the counter (13) is added. On the other hand, in step ST4, the subtracting means (15) causes the counter (1
1 is subtracted from the count value CHP of 3), that is, the pressure of the high-pressure refrigerant is excessively increased only once with stable driving of the compressor (1), which is considered to be a transient excessive increase. , The counter (13) will be subtracted.

After that, the above-mentioned steps ST3 and ST
From 4 to step ST5, it is determined whether or not the count value CHP of the counter (13) has reached 5. When the counter (13) is not 5, the above step ST5
Is NO, the process proceeds to step ST6, and it is determined whether the count value CHP of the counter (13) is less than 0, that is,
Determine whether the count value CHP is not "-1",
If it is not "-1", the process proceeds to step ST7. Then, the high pressure stopping means (11) brings the air conditioner into the thermo-off state and returns to the main flow, and when the condition of the thermo-on state is satisfied, the air conditioning operation is restarted.

After that, when the high pressure switch (HPS) outputs a high pressure signal, the operation from step ST1 is performed as described above, and when the count value CHP of the counter (13) becomes 5 in step ST5. If the determination in step ST5 is YES, the process proceeds to step ST8, and the abnormality processing means
(16) sends an error code and moves to step ST9. In step ST9, the residual operation is performed, that is, the drive of the compressor (1) is stopped, the electric expansion valve (5) is fully closed, and only the outdoor fan is driven for 30 seconds to radiate the inverter heat. After that, the air conditioning operation is stopped, the process returns to the main flow, and abnormal processing such as lighting of an abnormal lamp is performed.

In step ST6, if the count value CHP of the counter (13) is "-1", the determination becomes YES and the process proceeds to step ST10 to count value CHP of the counter (13). After setting 0 to the above step
The process returns to ST7, and the above operation is repeated.

Therefore, according to this embodiment, when the high pressure switch (HPS) detects an excessive rise in the high pressure refrigerant pressure, the high pressure signal output interval of the high pressure switch (HPS) is within a predetermined time. At some times, the coefficient value of the counter (13) is added, while when the output interval is long, the count value CHP of the counter (13) is subtracted. Since it is possible to continue, it is possible to improve comfort.

Further, when the output interval of the high voltage signal is longer than the predetermined time, the coefficient value of the counter (13) is subtracted, so that only the high voltage rise which is repeatedly generated from the entire air conditioning operation can be accurately detected. The reliability of operation control can be improved.

Further, since the predetermined time of the judging means (12) is set to the time from the driving of the compressor (1) to the stabilization of the driving, whether or not it is a transient high pressure rise is determined. It is possible to make a reliable determination.

Further, as another embodiment of the invention according to claims 1 and 3, although not shown, in FIG.
ST4 is omitted, and the high pressure switch (H
Only when the high voltage signal of (PS) is output within 30 minutes, the count value CHP of the counter (13) is added.

In this embodiment, step ST6
And it is not necessary to perform the operation of step ST10.
It moves from 5 to step ST7. Other configurations and operational effects are the same as those of the previous embodiment, and it is possible to accurately perform the abnormality processing by counting only the high pressure rise that requires the abnormality processing.

In each of the embodiments, the separate type air conditioner has been described, but it goes without saying that the present invention can be applied to various air conditioners.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a refrigerant circuit diagram showing a refrigerant piping system of the air conditioner.

FIG. 3 is a control flow chart when the high-pressure refrigerant pressure excessively rises.

[Explanation of symbols]

 1 compressor 3 outdoor heat exchanger (heat source side heat exchanger) 5 electric expansion valve (expansion mechanism) 6 indoor heat exchanger (use side heat exchanger) 9 refrigerant circuit 10 controller 11 high pressure stop means 12 judgment means 13 counter ( Counting means) 14 Addition means 15 Subtraction means 16 Abnormality handling means HPS High pressure switch (high pressure detection means)

Claims (3)

[Claims] 1. A compressor (1), a heat source side heat exchanger (3),
In an air conditioner equipped with a refrigerant circuit (9) in which an expansion mechanism (5) and a heat exchanger (6) on the use side are sequentially connected, a high pressure refrigerant pressure on the discharge side of the compressor (1) is detected. When the pressure of the high-pressure refrigerant rises to a predetermined value or higher, the high-pressure detection means (HPS) that outputs a high-pressure signal, and the high-pressure detection means (HPS) outputs a high-pressure signal, the compressor
A high pressure stop means (11) for restarting the operation of the compressor (1) after temporarily stopping the operation of (1), and for counting the number of times the high voltage signal output by the high pressure detecting means (HPS) is output. When the counting means (13) and the high voltage detecting means (HPS) output a high voltage signal, a short time signal is output if the output interval is within a predetermined time from the output of the previous high voltage signal to the output of this high voltage signal. A judging means (12) for outputting and an adding means (14) for adding 1 to the count value of the counting means (13) when the judging means (12) outputs a short time signal.
And, when the count value of the counting means (13) reaches a predetermined value, an abnormality processing means (16) for performing abnormality processing by stopping the air conditioning operation instead of the high pressure stopping means (11) is provided. And an air conditioner operation control device. 2. A compressor (1), a heat source side heat exchanger (3),
In an air conditioner equipped with a refrigerant circuit (9) in which an expansion mechanism (5) and a heat exchanger (6) on the use side are sequentially connected, a high pressure refrigerant pressure on the discharge side of the compressor (1) is detected. When the pressure of the high-pressure refrigerant rises to a predetermined value or higher, the high-pressure detection means (HPS) that outputs a high-pressure signal, and the high-pressure detection means (HPS) outputs a high-pressure signal, the compressor
A high pressure stop means (11) for restarting the operation of the compressor (1) after temporarily stopping the operation of (1), and for counting the number of times the high voltage signal output by the high pressure detecting means (HPS) is output. When the counting means (13) and the high voltage detecting means (HPS) output a high voltage signal, a short time signal is output if the output interval is within a predetermined time from the output of the previous high voltage signal to the output of this high voltage signal. The determination means (12) that outputs a long time signal when the output interval is longer than a predetermined time, and the determination means (12) outputs a short time signal, the count value of the counting means (13) becomes 1 Adding means for adding (14)
When the judging means (12) outputs a long time signal, the subtracting means (1) for subtracting 1 from the count value of the counting means (13)
5), and when the count value of the counting means (13) reaches a predetermined value, the high pressure stopping means (11) is replaced with an abnormality processing means (16) for performing an abnormality processing by stopping the air conditioning operation. An air conditioner operation control device characterized by: 3. The operation control device for an air conditioner according to claim 1 or 2, wherein the determination means (12) is operated for a predetermined period of time after the compressor (1) is driven. An operation control device for an air conditioner, which is set to a time until it stabilizes.