JPH11159836A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a low vibration air conditioner by controlling the phase of an AC voltage being fed to a rotary compressor such that vibration therefrom is canceled based on the detected position of rolling piston of the rotary compressor. SOLUTION: Rotary compressors 1A, 1B having a rolling piston are provided for the outdoor unit of an air conditioner and the position of the rolling piston of the rotary compressors 1A, 1B is detected by means of rolling piston position detectors 7A, 7B while the phase at point X and Y is detected by means of phase detectors 8A, 8B. At the time of simultaneous operation of the rotary compressors 1A, 1B, a controller 6 controls the phase of AC voltage of an inverter being fed to the compressors 1A, 1B such that the vibration therefrom is canceled at the joint of refrigerant piping based on the signals detected by the rolling piston position detectors 7A, 7B and the phase detectors 8A, 8B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a plurality of rotary compressors in one outdoor unit,
In particular, the present invention relates to a low-vibration air conditioner capable of detecting the position of a rolling piston of a rotary compressor and canceling vibrations with each other.

[0002]

2. Description of the Related Art A refrigerant circuit diagram of a conventionally used air conditioner having a plurality of rotary compressors is basically the one shown in FIG. 7, and is composed of an outdoor unit and a plurality of indoor units. Are common. In the figure, C is an outdoor unit, A and B are indoor units, 1A and 1B are rotary compressors having a constant rotation speed, 2 is an outdoor heat exchanger for condensing refrigerant,
3A and 3B are decompression devices, 4A and 4B are indoor heat exchangers that perform an evaporative action, 5A and 5B are devices for detecting an operation command from the room, 6 is a rotary compressor or the like that receives an operation command. It is a control device to perform. The rotary compressor 1A operates according to a command from the indoor unit A, and the rotary compressor 1B operates according to a command from the indoor unit B.

[0003]

Since the conventional air conditioner is configured as described above, the rotary compressor 1
When A and 1B are operating simultaneously, the rotary compressor 1
The positions of the rolling pistons A and 1B at a certain time are
Assuming that there is no slip, the phase of the torque vibration generated by the rotary compressors 1A and 1B is random because it is governed only by the operation start timing. For this reason, when the rotary compressors 1A and 1B are operated in a state where the phases of the torque vibrations are close to each other, the vibrations are amplified, and there is a possibility that the vibrations of the outdoor unit or the noise may occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a low vibration air conditioner which operates by controlling the phases of a plurality of rotary compressors and canceling their vibrations. The purpose is to obtain.

[0005]

An air conditioner according to the present invention includes an outdoor unit installed outdoors, an inverter unit provided in the outdoor unit and outputting an AC voltage of an arbitrary frequency, and an outdoor unit. D using a permanent magnet type rotor
Using a C brushless motor, operating at the same number of revolutions according to the frequency of the inverter device, a plurality of rotary compressors having a rolling piston and the position of the rolling piston of the rotary compressor are determined by a permanent magnet rotor. And a rolling piston position detecting device which detects the position of the rolling piston indirectly by detecting the position of the rolling piston of the rotary compressor detected by the rolling piston position detecting device. A control device for controlling a phase of an AC voltage to be output to each of the rotary compressors so that vibrations from the rotary compressor are offset at a connection portion of the refrigerant pipe.

[0006] Further, there is provided a phase detecting means for detecting the phase of vibration in each refrigerant pipe taken out of the rotary compressor.

The phase detecting means detects the phase of vibration of each refrigerant pipe immediately before each refrigerant pipe taken out of the rotary compressor is connected.

The phase detecting means detects the phase of the vibration of the refrigerant pipe which has a large contribution to transmitting the vibration among the refrigerant pipes taken out of the rotary compressor.

In addition, a database is provided in which the phase difference of the vibration at the location where the vibration from the rotary compressor is canceled is recorded for each frequency, and the control device outputs an AC signal to each of the rotary compressors based on the database. It controls the phase of the voltage.

[0010] The control device controls the vibration based on the vibration phase of the outdoor unit or the phase difference of the vibration at a location which greatly affects the noise caused by the vibration.

Further, the outdoor unit has an outdoor heat exchanger in a housing, and the control device individually connects the refrigerant pipes taken out of the rotary compressor to the outdoor heat exchanger, and connects the refrigerant pipes at respective connection portions. The control is performed based on the phase difference of the vibration.

In addition, the control device includes a valve for connecting the indoor and outdoor connection refrigerant pipes, and the control unit individually connects the refrigerant pipes taken out of the rotary compressor to the valves, based on a phase difference at each connection part. Control.

[0013] A first base for the rotary compressor having a high rigidity for fixing the rotary compressor is provided, and a second base provided in an outdoor unit for supporting the first base in vibration isolation. It is a thing.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG.
BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of embodiment of this invention, Comprising: It is a figure which shows the refrigerant circuit diagram of an air conditioner, and a part of control apparatus typically. Here, two rotary compressors and one refrigerant flow path are used. In the figure, 1A and 1B are provided in an outdoor unit of an air conditioner, and use a DC using a permanent magnet type rotor.
A rotary compressor using a brushless motor and operating at the same rotational speed according to the frequency of the inverter device and having a rolling piston, 7A and 7B are rotary compressors 1A and 1B
Rolling piston position detecting device for detecting the position of the rolling piston, 8A and 8B are phase detecting devices for detecting the phases at X point and Y point, respectively, and Z point is the rotary compressor 1.
A, where the refrigerant pipes taken out of 1B are connected, 6
Indicates the operation of the rotary compressors 1A, 1B based on the position detection signals of the rolling pistons of the rotary compressors 1A, 1B from the rolling piston position detectors 7A, 7B and the phase difference detected from the phase detectors 8A, 8B. This is a control device for controlling the phase.

Further, the rolling piston position detecting device 7
A and 7B detect the position of the rolling piston of the rotary compressors 1A and 1B indirectly by detecting the position of the permanent magnet type rotor.

In the air conditioner thus configured, when the two rotary compressors 1A and 1B are simultaneously operated, the rolling piston position detecting device 7 of the rotary compressors 1A and 1B is operated.
A, 7B and the signals detected by the phase detection devices 8A, 8B, the control device 6 controls the rotary compressor 1 at the Z point.
The phase of the AC voltage of the inverter device output to each of the rotary compressors 1A and 1B is controlled so that the vibrations from A and 1B cancel each other.

In order to cancel the vibration by detecting the position of the rolling piston of each of the rotary compressors 1A and 1B and controlling the operation phase of each of the rotary compressors 1A and 1B, the rotary compressors 1A and 1B are required. Since the number of rotations must be the same, a plurality of rotary compressors 1
The rotation speeds of A and 1B are varied while keeping the same. By performing such control, it is possible to change the capacity and reduce the vibration.

Embodiment 2 FIG. In the first embodiment, Z
The case where the phase detection devices 8A and 8B are provided at the X point and the Y point respectively to cancel the vibration at the point has been described. However, the phase difference between the X point and the Y point is previously stored as a database, so that the phase detection device is provided. Vibration at the Z point can be canceled without providing 8A and 8B. FIG.
Shows the concept of the database in the second embodiment, and shows the relationship between the rotational speeds of the rotary compressors operating at the same rotational speed and the phases at points X and Y.
In FIG. 2, when the rotational speed of each rotary compressor is n, a phase difference is obtained from the phase at the point X and the phase at the point Y, and the phase difference is stored as a database for each frequency. FIG. 3 shows an example of a database.

According to the above-mentioned embodiment, low-vibration operation can be performed at low cost without providing the phase detecting means 8A and 8B by storing the phase difference in the frequency canceling portion as a database for each frequency. Become.

Embodiment 3 Further, in the first and second embodiments, the vibration is canceled by the vibration transmission path in consideration of the phase difference in the refrigerant pipe. However, the vibration of the air conditioner such as a housing forming an outer shell of the air conditioner, and By considering the phase difference in a portion where noise caused by vibration is a problem, it is possible to cancel the vibration in a portion where a problem occurs. FIG. 4 shows a part of a refrigerant circuit of an air conditioner according to a third embodiment. In consideration of a phase difference at a point X at which vibration and noise caused by the vibration are problematic, the rotary compressor 1A, 1
The operation phase of B is controlled. In FIG.
1A and 1B are rotary compressors, 2 is an outdoor heat exchanger, 9 is a four-way switching valve for switching the refrigerant flow path between cooling and heating, and point X is the vibration of the outdoor unit and a portion where noise caused by the vibration is generated. Yes, the phase of the operation of the rotary compressor is controlled so as to cancel the vibration at the point X by considering the phase difference at the point X.

According to the above-described embodiment, it is possible to cancel the vibration of a specific portion of the outdoor unit irrespective of the form of the flow path of the refrigerant.

Embodiment 4 FIG. 5 shows Embodiment 4
Fig. 3 shows a part of a refrigerant circuit of an air conditioner, which is a case where two simplest rotary compressors are dedicated to cooling.
In FIG. 5, 1A and 1B are rotary compressors, 2 is an outdoor heat exchanger, and Z is a housing near the outdoor heat exchanger 2.
Rotary compressor 1 so as to cancel the vibration at point X inside
By controlling the operation phases of A and 1B, it is possible to reduce the vibration of the housing Z near the outdoor heat exchanger 2.

Embodiment 5 In the fourth embodiment, the vibration of the housing near the outdoor heat exchanger is reduced.
It can also be used to reduce the vibration of the housing near the valve connecting the indoor and outdoor connection refrigerant pipes.

Embodiment 6 FIG. Further, the present invention can also be used when a plurality of rotary compressors are fixed to a highly rigid base for a rotary compressor, and the base for the rotary compressor is fixed to a base of an air conditioner. In FIG. 6, reference numerals 1A and 1B denote rotary compressors, 10 denotes a first base as a rotary compressor base, 11 denotes a rotary compressor base 10 as a second base as an outdoor unit base. 12 is a support structure for vibration-proof support.

By performing the phase control with such a configuration, the moment of inertia of the vibrating body increases, and the vibration can be further reduced.

[0026]

The air conditioner according to the present invention has an outdoor unit installed outdoors, an inverter device installed in the outdoor unit for outputting an AC voltage of an arbitrary frequency, and an air conditioner installed in the outdoor unit, Using a DC brushless motor using a magnet rotor, operating at the same rotation speed according to the frequency of the inverter device, a plurality of rotary compressors having rolling pistons, and the positions of the rolling pistons of the rotary compressor Is detected indirectly by detecting the position of the permanent magnet type rotor, and a rotating piston is detected based on the position of the rolling piston of the rotary compressor detected by the rolling piston position detecting device. Each of the rotary compressors is connected so that vibrations from the rotary compressor cancel out at a connection portion of a refrigerant pipe that is taken out of the compressor. Since the configuration of a control device for controlling the phase of the AC voltage output, and can be operated low vibration.

Further, by providing the phase detecting means in each of the refrigerant pipes, a stable low vibration operation which is not affected by external factors can be performed.

Further, by providing the phase detecting means immediately before each refrigerant pipe is connected, it is possible to operate with lower vibration.

Further, by providing the position detecting means in a portion where the contribution of vibration transmission is large, a low vibration operation can be more effectively performed.

In addition, since the phase difference at the position where vibration is canceled is stored as a database for each frequency, low-vibration operation can be performed at low cost without providing a phase detecting means.

Further, by controlling the vibration of the outdoor unit and the phase difference of a portion which has a great influence on the noise caused by the vibration, the problematic portion can be concentrated and the vibration can be reduced.

Further, the outdoor unit has an outdoor heat exchanger in the housing, and the control device individually connects the refrigerant pipes taken out of the rotary compressor to the outdoor heat exchanger, and connects the refrigerant pipes at the respective connection portions. By controlling based on the phase difference of the vibration, the vibration in the casing near the outdoor heat exchanger can be reduced.

[0033] Further, a valve is provided for connecting the refrigerant pipes connected to the indoor and outdoor, and the control device individually connects the refrigerant pipes taken out of the rotary compressor to the valves, and based on a phase difference at each connection part. Control, vibration in the housing portion near the valve can be reduced.

Also, a first base for the rotary compressor having a high rigidity for fixing the rotary compressor is provided, and a second base provided on an outdoor unit for supporting the first base in vibration isolation. With this configuration, operation with lower vibration can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention, and is a diagram schematically illustrating a refrigerant circuit diagram of an air conditioner and a part of a control device.

FIG. 2 is a diagram showing a concept of a database according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a specific example of a database according to Embodiment 2 of the present invention;

FIG. 4 is a diagram schematically showing a third embodiment of the present invention.

FIG. 5 is a diagram schematically showing a fourth embodiment of the present invention.

FIG. 6 is a diagram schematically showing a sixth embodiment of the present invention.

FIG. 7 is a refrigerant circuit diagram of a conventional air conditioner having a plurality of rotary compressors.

[Explanation of symbols]

1A, 1B rotary compressor, 2 outdoor heat exchanger, 6 controller, 7A, 7B rolling piston position detector,
8A, 8B phase detector, 9 four-way switching valve, 10 base for rotary compressor, 11 support structure, 12 base of outdoor unit.

Claims (9)

[Claims] An outdoor unit installed outdoors, an inverter device provided in the outdoor unit to output an AC voltage of an arbitrary frequency, and a DC installed in the outdoor unit and using a permanent magnet rotor
Using a brushless motor, operating at the same rotation speed according to the frequency of the inverter device, a plurality of rotary compressors having a rolling piston, The position of the rolling piston of the rotary compressor,
A rolling piston position detecting device that detects the position of the permanent magnet type rotor indirectly, and a position of the rolling piston of the rotary compressor detected by the rolling piston position detecting device; A control device that controls a phase of the AC voltage output to each of the rotary compressors so as to cancel vibrations from the rotary compressor at a connection portion of a refrigerant pipe that is taken out of the rotary compressor. An air conditioner comprising: 2. The air conditioner according to claim 1, further comprising a phase detecting unit that detects a phase of vibration in each of the refrigerant pipes taken out of the rotary compressor. 3. The phase detecting means detects a phase of vibration of each refrigerant pipe immediately before connection of each refrigerant pipe taken out of the rotary compressor. The air conditioner according to any one of the preceding claims. 4. The method according to claim 1, wherein said phase detecting means detects a phase of vibration of a refrigerant pipe having a large contribution of transmitting vibration among respective refrigerant pipes taken out of said rotary compressor. The air conditioner according to claim 2, wherein 5. A database that records, for each frequency, a phase difference of vibration at a location where vibration from the rotary compressor is canceled, and wherein the control device controls each of the rotary compressors based on the database. The air conditioner according to claim 1, wherein a phase of the output AC voltage is controlled. 6. The control device according to claim 2, wherein the control device performs control based on a vibration phase of the outdoor unit or a phase difference between vibrations of a portion that greatly affects noise caused by the vibration. 6. The air conditioner according to 5. 7. The outdoor unit includes an outdoor heat exchanger in a housing, and the controller individually connects refrigerant pipes taken out of the rotary compressor to the outdoor heat exchanger, The air-conditioning apparatus according to claim 2, wherein the control is performed based on a phase difference of the vibration at the connecting portion. 8. A valve for connecting an indoor / outdoor connection refrigerant pipe, wherein the control device individually connects the refrigerant pipe taken out of the rotary compressor to the valve, and controls a position at each connection part. The air conditioner according to claim 2 or 5, wherein the control is performed based on the phase difference. 9. A first base for a rotary compressor having high rigidity for fixing the rotary compressor, and a second base provided on the outdoor unit for supporting the first base in vibration isolation. 2. The method according to claim 1, further comprising:
The air conditioner according to any one of the preceding claims.