JPH05322270A - Space heating and cooling machine - Google Patents

Abstract

PURPOSE:To improve the durability of a compressor by a method wherein the compressor is not driven when there is abnormality in an indoor fan motor and/or in an outdoor fan motor upon starting a heating and cooling machine utilizing the compressor. CONSTITUTION:The title machine is provided with an indoor current detecting means 33, detecting the operation current of an indoor fan motor 8, an outdoor current detecting means 37, detecting the operation current of an outdoor fan motor 5, and a compressor driving unit 142, stopping the indoor fan motor 8 and the outdoor fan motor 5 when the detecting current of an indoor current comparing unit 34 or the detecting current of an outdoor current comparing unit 38 has become higher than a predetermined indoor current setting value (a) or an outdoor current setting value A and driving a compressor 1 when the accumulated time of an indoor time accumulating unit 36 or an outdoor time accumulating unit 40 has become higher than a predetermined period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating / cooling machine using a compressor.

[0002]

2. Description of the Related Art Conventionally, this type of heating / cooling machine has a structure as shown in FIG.

That is, 1 is a compressor, 2 is a first check valve provided in the discharge pipe of the compressor 1, 3 is a four-way valve, and 4 is an outdoor heat exchanger blower 6 having an outdoor fan motor 5. The outdoor heat exchanger 7 has an indoor heat exchanger 7 having an indoor heat exchanger blower 9 having an indoor fan motor 8, and these are sequentially piped to form a refrigerant circulation path. 10 is a refrigerant heater connected in the middle of the circulation path, 11 is a refrigerant heater 1
A combustion burner for heating 0, 12 is a gas-liquid separator, 13 is a receiver, 14 is a first solenoid valve, and is located in a pipe 15 connecting the upper part of the gas-liquid separator 12 and the upper part of the receiver 13. I'm busy. A second check valve 16 is provided in the liquid receiver 13
Is located in the pipe 17 that connects the lower part of the and the lower part of the gas-liquid separator 12. A third check valve 18 is located in a pipe 19 connecting the indoor heat exchanger 7 and the upper part of the liquid receiver 13. 20 is a fourth check valve, which is a gas-liquid separator 12
Of the first check valve 2 and the pipe 21 that connects the first check valve 2 and the four-way valve 3 to each other. Reference numeral 23 is a first expansion device, 24 is a second electromagnetic valve, and the first expansion device 23 and the second electromagnetic valve 24 are in a pipe 25 connecting the outdoor heat exchanger 4 and the lower part of the refrigerant heater 10. It is located in series. Reference numeral 26 is a third electromagnetic valve, 27 is a second expansion device, and the third electromagnetic valve 26 and the second expansion device 27 connect the lower part of the gas-liquid separator 12 and the lower part of the refrigerant heater 10 with a pipe 28. Are arranged in series in a pipe 29 that connects the pipe 19 with the pipe 19. The upper part of the refrigerant heater 10 and the upper part of the gas-liquid separator 12 are connected by a pipe 30. First solenoid valve 14 and second
The solenoid valve 24 is connected by a pipe 31. Further, the control device 32 controls the indoor current detecting means 33 for detecting the operating current of the indoor fan motor 8 and the indoor current comparing section 34 for comparing the detected operating current with a predetermined predetermined indoor current set value.
The indoor fan motor drive unit 35 that applies a drive voltage to the indoor fan motor 8, the compressor drive unit 42 that drives the compressor 1, and the indoor fan motor 8 and the compressor based on the comparison results of the indoor current comparison unit 34. 1 and the operation control unit 43 that issues a command to stop the operation.

In the above-described refrigerant circuit configuration, during the cooling operation, the four-way valve 3 is switched so that the discharge gas of the compressor 1 flows to the outdoor heat exchanger 4, and the second solenoid valve 24 and the third solenoid valve 26 are opened. Therefore, the first diaphragm device 23 and the second diaphragm device 2
A refrigerant circuit is configured such that 7 serves as a throttle device and the indoor heat exchanger 7 serves as an evaporator. When the heating operation is started, first, a refrigerant recovery operation is performed to recover the refrigerant in the outdoor heat exchanger 4 and the compressor 1 not used as the heating circuit to the heating circuit side. The four-way valve 3 is switched in the opposite direction to that in the cooling operation, and the compressor 1 is operated in a state where the outdoor heat exchanger 4 is connected to the suction side of the compressor 1 to operate the outdoor heat exchanger 4 and the compressor 1. The refrigerant is collected in the indoor heat exchanger 7.

What is common at the time of starting the cooling operation and the heating operation described above is that the indoor fan motor drive unit 3 is operated when a command for heating or cooling operation is sent to the control device 32 by a remote controller or the like.
5 gradually applies a voltage to the indoor fan motor 8. or,
The compressor drive unit 42 applies a voltage to the compressor 1. At this time, the indoor current detection means 33 detects the operating current of the indoor fan motor 8, and the detected current value is compared with a predetermined indoor current value which is the indoor current comparison unit 34. And
When the detected current value is larger than the predetermined indoor current set value in the comparison result of the indoor current comparison unit 34, the operation control unit 43 causes the indoor fan motor drive unit 35 and the compressor drive unit 42 to operate. The stop command is issued, and the application of voltage to the indoor fan motor 8 and the compressor 1 is stopped and the operation is stopped.

[0006]

However, in the above configuration, when the indoor fan motor 8 is locked due to the failure of the blower 9 for the indoor heat exchanger or other causes, the indoor fan motor 8 is supplied with more current than necessary. Is detected and the indoor fan motor 8 is stopped, so that the indoor fan motor 8 is protected. However, until the operation control unit 43 issues a stop command to the compressor drive unit 42 and the compressor 1 stops, the compressor 1 is operated in an abnormal state where it is not blown to the indoor heat exchanger 7, The compressor 1 is operated when liquid back occurs or is unnecessary, and the compressor 1
Had a problem of deteriorating the durability. Further, when the outdoor fan motor 5 is locked due to a failure of the outdoor heat exchanger blower 6 or other causes, the compressor 1 is operated in an abnormal state in which the outdoor heat exchanger 4 is not blown. At this time, liquid compression occurs in the compressor 1 due to liquid backing, or the discharge pressure of the compressor 1 becomes abnormally high, which causes a problem that durability and reliability of the compressor 1 are deteriorated. ..

The present invention solves the above-mentioned conventional problems. When the operation is started, first, the operating currents of the indoor fan motor and the outdoor fan motor are detected to determine that there is no abnormality, and then the compressor is driven. The purpose is to improve the durability of the compressor.

[0008]

In order to solve the above problems, a heating / cooling machine of the present invention has a control device for controlling the operation of an indoor fan motor, an outdoor fan motor and a compressor. Is an indoor current detecting means for detecting an operating current of the indoor fan motor, an indoor current comparing portion for comparing the detected current of the indoor current detecting means with a predetermined indoor current set value, and a driving voltage for the indoor fan motor. An indoor fan motor drive unit for applying the indoor fan motor, an indoor time integration unit for integrating the time from the start of applying the drive voltage to the indoor fan motor, an outdoor current detection unit for detecting an operating current of the outdoor fan motor, and An outdoor current comparing section for comparing the detected current of the outdoor current detecting means with a predetermined predetermined outdoor current setting value, and an outdoor fan motor for applying a drive voltage to the outdoor fan motor. Moving part, an outdoor time integrating part that integrates the time from the start of applying the drive voltage to the outdoor fan motor, and from the start of applying the drive voltage to the indoor fan motor to the comparison of the indoor current comparison part Required time or a predetermined time longer than the time required from the start of applying the drive voltage to the outdoor fan motor until the comparison result is obtained in the outdoor current comparison unit and the indoor time integration unit or the outdoor time integration unit And a compressor for driving the compressor when the integrated time of the indoor time integrating unit or the outdoor time integrating unit is longer than a predetermined time in the comparison result of the time comparing unit and the time comparing unit. When the comparison result of the drive unit and the indoor current comparison unit is higher than a predetermined indoor current value, or when the comparison result of the outdoor current comparison unit is higher than a predetermined outdoor current value. In is obtained by a structure having said indoor fan motor driving said outdoor fan said instructions to stop the drive of the motor chamber fan motor drive unit and the outdoor fan motor driving unit and the sending operation control unit.

[0009]

According to the present invention, with the above-mentioned structure, the operating currents of the indoor fan motor and the outdoor fan motor are detected at the time of starting the operation, and these detected currents are compared with the predetermined indoor current setting value and outdoor current setting value, respectively. The comparison result came out,
If it is normal, the compressor is driven, so the compressor can be started up smoothly and smoothly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a system block diagram of the present invention. In FIG. 1, a control device 32 for controlling the operation of the outdoor fan motor 5, the indoor fan motor 8 and the compressor 1.
Is an indoor current detecting means 33 for detecting an operating current of the indoor fan motor 8 and an indoor current comparing section 34 for comparing the detected operating current with a predetermined predetermined indoor current set value.
An indoor fan motor drive unit 35 that applies a drive voltage to the indoor fan motor 8, an indoor time integration unit 36 that integrates the time from the beginning of applying the drive voltage to the indoor fan motor 8, and the outdoor fan motor 5 The outdoor current detecting means 37 for detecting the operating current, the outdoor current comparing section 38 for comparing the detected operating current with a certain predetermined outdoor current set value, and the outdoor fan for applying the driving voltage to the outdoor fan motor 5. The motor drive unit 39 and the outdoor fan motor 5
The outdoor time integration unit 40 that integrates the time from the beginning of applying the drive voltage to the indoor time, and the time required from the start of applying the drive voltage to the indoor fan motor 8 to the comparison result by the indoor current comparison unit 34 or A predetermined time set longer than the time required from the start of applying the drive voltage to the outdoor fan motor 5 until the comparison result is obtained by the outdoor current comparison unit 38 and the indoor time integration unit 36 or the outdoor time integration unit 40. Time comparison unit 41 for comparing the time with
And a compressor drive unit 42 that drives the compressor 1 when the integrated time of the indoor time integration unit 36 or the outdoor time integration unit 40 is longer than a predetermined time in the comparison result of the time comparison unit 41, When the comparison result of the indoor current comparison unit 34 is higher than a predetermined indoor current set value or when the comparison result of the outdoor current comparison unit 38 is higher than the predetermined outdoor current set value, the indoor fan motor 8 is driven and the outdoor fan is driven. The operation control unit 43 sends a command to stop the driving of the motor 5 to the indoor fan motor driving unit 35 and the outdoor fan motor driving unit 39. The same members as those in FIG. 6 showing the conventional example are designated by the same reference numerals,
The description is omitted.

Referring to FIG. 2, the time required from when the driving voltage is applied to the indoor fan motor 8 to when the indoor current section 34 outputs a comparison result is longer than the time when the driving voltage is applied to the outdoor fan motor 5. A case will be described in which it is shorter than the time required from the beginning to the time when the comparison result is obtained by the outdoor current comparison unit 38. In the figure, the horizontal axis represents the time from the start of operation, and the vertical axis represents the applied voltage of the indoor fan motor 8, the current of the indoor fan motor 8 and the applied voltage of the compressor 1, and the indoor fan motor 8 at startup is shown. And the operation control of the compressor 1. When the voltage applied to the indoor fan motor 8 is gradually applied to the indoor fan motor 8 as shown by the solid line in the upper part of the figure, the voltage reaches the set voltage of the indoor fan motor 8 at time t. At this time,
The normal current of the indoor fan motor 8 is shown by the solid line in the middle of the figure. Also, the blower 9 for the indoor heat exchanger
In the case where the indoor fan motor 8 is in an abnormal state such that it is locked due to a failure such as the above, it becomes as shown by the dotted line in the middle of the figure. Now, a current value that is smaller than the indoor breakdown current c that the indoor fan motor 8 breaks and that is larger than the indoor operating current b with respect to the set voltage of the indoor fan motor 8 is set as a predetermined indoor current set value a.

Room breakdown current c> predetermined room current set value a
> Indoor operating current b In the above-mentioned abnormal case (dotted line in the middle of the figure), the time until the current of the indoor fan motor 8 reaches a predetermined indoor current set value a is t1 (the indoor fan motor 8 is driven). The time taken from the start of applying the voltage until the comparison result is obtained by the indoor current comparison unit 34). The time t2 shown in the lower part of the figure is a time longer than t1 and indicates that the compressor set voltage is applied to the compressor 1 after the time t2 from the start of operation. Then, this t2 is a predetermined time.

Next, referring to FIG. 3, the time required from the start of applying the drive voltage to the indoor fan motor 8 until the indoor current comparison section 34 produces a comparison result is determined by the outdoor fan motor 5. A case will be described in which it is longer than the time required from the start of applying the drive voltage until the comparison result is obtained in the outdoor current comparison unit 38. In the figure,
The horizontal axis shows the time from the start of operation, and the vertical axis shows the applied voltage of the outdoor fan motor 5, the current of the outdoor fan motor 5 and the applied voltage of the compressor 1, and the outdoor fan motor 5 and the compressor 1 at the time of start-up. It shows the operation control of. As shown in the upper part of the figure, when the voltage applied to the outdoor fan motor 5 is gradually applied to the outdoor fan motor 5 as indicated by the solid line, the set voltage of the outdoor fan motor 5 is reached at time T. At this time, the current of the outdoor fan motor 5 in the normal case is as shown by the solid line in the middle of the figure. Further, due to a failure of the blower 6 for the outdoor heat exchanger, the outdoor fan motor 5
In the case of an abnormal state in which is locked, it becomes as shown by the dotted line in the middle part of the figure. Now, a current value that is smaller than the outdoor breakdown current C that the outdoor fan motor 5 breaks and that is larger than the outdoor operation current B with respect to the set voltage of the outdoor fan motor 5 is set as a predetermined outdoor current set value A.

Outdoor breakdown current C> predetermined outdoor current set value A
> Outdoor operation current B Further, in the above-mentioned abnormal case (dotted line in the middle of the figure), the time until the current of the outdoor fan motor 5 reaches the predetermined outdoor current set value A is t1 (the outdoor fan motor 5 is driven). It is the time required from when the voltage is applied until the comparison result is obtained in the outdoor current comparison unit 38). T2 shown in the lower part of the figure is a time longer than T1, and indicates that the compressor set voltage is applied to the compressor 1 after the time T2 from the start of operation. And this T2 is a predetermined time.

That is, when an operation command for heating or cooling comes to the controller 32, the indoor fan motor drive section 35 and the outdoor fan motor drive section 39 start to apply voltage to the indoor fan motor 8 and the outdoor fan motor 5, respectively.
Furthermore, the indoor time integration unit 36 and the outdoor time integration unit 40
Respectively integrates the time from the beginning of applying the voltage to the indoor fan motor 8 and the outdoor fan motor 5, respectively. The indoor current detecting means 33 and the outdoor current detecting means 37 regularly detect the current values of the indoor fan motor 8 and the outdoor fan motor 5, respectively, and the indoor current comparing section 34 detects the detected current of the indoor fan motor 8 each time. And a predetermined indoor current set value a, and the outdoor current comparison unit 38 compares the detected current of the outdoor fan motor 5 with a predetermined outdoor current set value A.
The detected current values of the indoor fan motor 8 and the outdoor fan motor 5 are smaller than the predetermined indoor current set value a and the predetermined outdoor current set value A, respectively, and the time comparison unit 41 compares the result of the predetermined time or more. If so, the compressor drive unit 4
Reference numeral 2 drives the compressor 1 by applying a compressor set voltage to the compressor 1.

Based on the comparison result of the indoor current comparing section 34, the detected current of the indoor fan motor 8 is a predetermined indoor current set value a.
If it becomes larger, or if the detected current of the outdoor fan motor 5 becomes larger than a predetermined outdoor current set value A according to the comparison result of the outdoor current comparison unit 38, the operation control unit 43 drives the indoor fan motor 8 and the outdoor unit. The indoor fan motor drive unit 3 issues a command to stop the drive of the fan motor 5, respectively.
5, send to the outdoor fan motor drive unit 39. When the detected current of the indoor fan motor 8 is larger than the predetermined indoor current set value a, changes in the voltage and current applied to the indoor fan motor 8 are as shown by the dotted lines in the upper and middle rows of FIG. Further, the detected current of the outdoor fan motor 5 is a predetermined outdoor current set value A
The changes in the applied voltage and current to the outdoor fan motor 5 when the values are larger are as shown by the dotted lines in the upper and middle stages of FIG.

Next, another embodiment of the present invention will be described with reference to FIG. The refrigerant circuit shown in FIG. 4 is a well-known circuit, and the same members as those in FIG. 1 are designated by the same reference numerals. Further, the actions and effects of the indoor fan motor, the outdoor fan motor, and the compressor at the time of starting the heating / cooling operation are the same as in the case of FIG. 1, and thus detailed description will be omitted.

FIG. 5 shows a flow chart when the above processing flow is realized by a microcomputer.

As described above, the operating currents of the indoor fan motor and the outdoor fan motor are detected when the operation is started, and the detected currents are compared with the predetermined indoor current set value and the predetermined outdoor current set value, respectively. As a result, the compressor is driven if it is normal, so that the durability of the compressor is improved.

[0021]

As described above, according to the heating / cooling machine of the present invention, the following effects can be obtained.

When the operation is started, first, the currents of the indoor fan motor and the outdoor fan motor are detected to judge that they are normal, and then the compressor is driven. In addition, when the indoor fan motor or the outdoor fan motor becomes abnormal due to a failure of the blower for the indoor heat exchanger, a failure of the blower for the outdoor heat exchanger, or other causes, the current value of the indoor fan motor and the outdoor fan motor Judging by the current value, if there is an abnormality in either one, the application of the drive voltage to the indoor fan motor, the outdoor fan motor and the compressor is stopped, so liquid back does not occur in the compressor, Further, since the overload operation does not occur, the durability and reliability of the compressor are improved, and the safe operation can be guaranteed.

[Brief description of drawings]

FIG. 1 is a system block diagram of a controller for a heating / cooling machine according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing the relationship between the voltage applied to the indoor fan motor, the current, and the voltage applied to the compressor with respect to the time from the start of operation.

FIG. 3 is a characteristic diagram showing a relationship between an outdoor fan motor applied voltage, a current, and a compressor applied voltage with respect to time from the start of operation.

FIG. 4 is a system block diagram of a controller for a heating / cooling machine according to another embodiment of the present invention.

FIG. 5 is a flowchart showing the flow of processing of the microcomputer in one embodiment of the present invention.

FIG. 6 is a system block diagram of a control device for a heating / cooling machine in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 compressor 4 outdoor heat exchanger 5 outdoor fan motor 6 blower for outdoor heat exchanger 7 indoor heat exchanger 8 indoor fan motor 9 blower for indoor heat exchanger 23 first expansion device 27 second expansion device 32 control device 33 indoor Current detection means 34 Indoor current comparison section 35 Indoor fan motor drive section 36 Indoor time integration section 37 Outdoor current detection means 38 Outdoor current comparison section 39 Outdoor fan motor drive section 40 Outdoor time integration section 41 Time comparison section 42 Compressor drive section 43 Operation control unit

 ───────────────────────────────────────────────―― ─── Continuation of front page (72) Inventor Ryuta Kondo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A compressor, an indoor heat exchanger having an indoor fan motor for driving an indoor heat exchanger blower, an outdoor heat exchanger having an outdoor fan motor for driving an outdoor heat exchanger blower, and a throttle device. A refrigerant circuit is provided, and a control device that controls the operation of the indoor fan motor, the outdoor fan motor, and the compressor is provided, and the control device is an indoor current detection unit that detects an operating current of the indoor fan motor. An indoor current comparison unit that compares the detection current of the indoor current detection unit with a predetermined predetermined indoor current setting value; an indoor fan motor drive unit that applies a drive voltage to the indoor fan motor; An indoor time integration unit that integrates the time from the beginning of applying a voltage, an outdoor current detection unit that detects an operating current of the outdoor fan motor, and an outdoor current detection unit. An outdoor current comparison unit that compares the detected current of the means with a predetermined outdoor current setting value; an outdoor fan motor drive unit that applies a drive voltage to the outdoor fan motor; and a drive voltage that starts to be applied to the outdoor fan motor. The time required from the start of applying the drive voltage to the indoor fan motor to the time when the indoor current comparison unit outputs a comparison result or the start of applying the drive voltage to the outdoor fan motor. From the time comparison unit for comparing a predetermined time set to a time longer than the time required for the comparison result to be obtained in the outdoor current comparison unit with the time in the indoor time integration unit or the outdoor time integration unit, the time comparison When the integrated time of the indoor time integrating section or the outdoor time integrating section is larger than a predetermined time according to the comparison result of the parts, compression for driving the compressor When the comparison result of the driving unit and the indoor current comparison unit is higher than a predetermined indoor current value or when the comparison result of the outdoor current comparison unit is higher than a predetermined outdoor current value, the indoor fan motor is driven and the outdoor fan motor is driven. A heating / cooling machine having an operation control section for sending a command to stop the driving of the indoor fan motor drive section and the outdoor fan motor drive section.