JPH11101516A - Air conditioner having inverter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the affection of a power supply frequency by a method wherein the rotation of a motor for driving a compressor is controlled by an inverter so that an air conditioning capacity is developed as same as the case of another specified power supply frequency, in a case where a detected power supply frequency is a specified frequency. SOLUTION: When the frequency of a power supply 10 is detected by a power supply frequency detecting unit 33 so that it is 50 Hz, a correcting value αis added to a frequency A1 , corresponding to a requested frequency A0 , by an inverter frequency determining unit 9. As a result, the inverter frequency determining unit 9 controls an inverter 5 so as to supply the power of corrected frequency A1 ' to a compressor motor 6. Accordingly, the compressor motor 6 is driven by the power of corrected frequency A1 ' whereby the reduction of number of rotation of a compressor motor 32 is complemented and an air conditioning capacity, same as in the case of 60 Hz of power supply frequency, is developed when the number of rotation of fan motors 4, 71 is reduced and the compressor motor 32 is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an inverter
Air conditioning equipment, especially as an air conditioning system for buildings
It is something for you. [0002] 2. Description of the Related Art A plurality of indoor units can be individually controlled by one outdoor unit.
Multi-room air conditioner to be controlled
Call it. ) Is lower cost and lower than conventional air conditioning systems.
Considering the advantages of construction, etc.,
It is flowing. Fig. 3 shows the concept of this type of multi air conditioner
FIG. As shown in FIG.
An air conditioner is a single room installed on the roof of a building, for example.
The outdoor unit 01 is connected to the outdoor unit 01 via a refrigerant pipe 02.
For example, indoor units installed in each room of a building
03₁, 03_Two, ..., 03_nConsists of Outdoor unit 0
1 and each indoor unit 03₁~ 03_nEach has a heat exchanger
At the same time, the outdoor unit 01
Have In addition, each indoor unit 03₁~ 03_nIs remote
Operation unit 03 _1a, 03_2a, ..., 03_naHas,
This remote control unit 03_1a~ 03_naSet air conditioning conditions such as room temperature
Is to be specified. Each indoor unit 03₁~ 03_nIn
Air-conditioning conditions are transmitted via a communication line,
The control unit adjusts the drive speed of the compressor and the opening of various valves
For example, necessary control is performed. Take, Maru
In an air conditioner, each indoor unit 03₁~ 03_nsettings of
Due to fluctuations in air conditioning conditions, such as temperature,
Generally, the load of the presser fluctuates greatly. So
Here, in order to be able to follow such load fluctuations well,
In multi air conditioners, electric motors drive compressors
Control compressor that controls the speed of the
Is used. FIG. 4 has an inverter controlled compressor.
FIG. 1 shows a control system for a motor of a multi-air conditioner according to the related art
FIG. In the figure, the indoor unit is the indoor unit.
03 ₁Only the representative is shown, but other indoor units 03_Two~ 03
_nHas the same configuration. As shown in FIG.
On the outdoor unit 01 side, the fan motor 04 of the heat exchanger and
For driving a compressor whose rotation is controlled by the inverter 05
Of the outdoor unit 03₁
On the side, a fan motor 07 of a heat exchanger is provided. here
The inverter 05 is connected to the indoor unit 03₁Required inverter
Requested frequency A transmitted by wave number generator 08₀According to the in
Frequency A determined by barter frequency determination unit 09₁Power
It is controlled so as to be supplied to the compressor motor 06.
Indoor unit 03 at this time₁Requested frequency A transmitted by₀Haso
Determined according to the air conditioning conditions such as the set temperature of the
And sent to the inverter frequency determination unit 08 of the outdoor unit 01.
It is. The required power at this time is 50 Hz or 6 Hz.
The power supply 010 supplies the power of 0 Hertz. [0004] SUMMARY OF THE INVENTION In the prior art as described above,
In such a multi-air conditioner, the power is 50 Hz or
Since the power is supplied from the power supply 010 of 60 Hz,
When the wave number is 50 Hz and 60 Hz,
Motors 04 and 07 differ according to the frequency.
As a result, there is a difference in the air conditioning capacity,₁~ 03_nInstall
Power supply frequency at the time when the indoor temperature reaches the set value.
There is a problem that the influence of the difference appears. Toes
Even if it is a multi air conditioner of the same specification, 50 Hz
When connected to power supply 010 and used, fan motor 0
The lack of 4,07 rotations reduces air conditioning capacity.
There is a point. The present invention has been made in view of the above prior art, and
Inverter that can provide sufficient air conditioning capacity by removing the influence of the number
To provide an air conditioner having
You. [0006] [MEANS FOR SOLVING THE PROBLEMS]
The structure of Akira is characterized as follows. 1) Compressor driven by inverter
With an inverter configured to control an electric motor for
Power supply frequency is detected and detected
If the power frequency is 50 Hz,
In order to achieve the same air conditioning capacity as at 0 Hz,
Inverter so that the motor for driving the presser rotates
Controlling the electric motor. 2) Compressor driven by inverter
With an inverter configured to control an electric motor for
In an air conditioner, the frequency according to the power supply frequency is
It has a setting switch for setting, and this setting switch
If the power frequency set to 50 Hz is
Exhibits the same air conditioning capacity as when the frequency is 60 Hz
So that the electric motor for driving the compressor rotates.
The inverter is used to control the motor. 3) Invar described in 1) or 2) above
The air-conditioning equipment with
-Driven inverter control compressor and inverter control
Constant speed compressor driven by a constant rotation motor that does not control
And an inverter-controlled compressor
To respond to low loads, and as the load increases,
When the output of the compressor control compressor reaches its maximum,
Set the output of the inverter control compressor to zero or near zero
To drive the constant speed compressor, and then increase the load
To increase the output of the inverter-controlled compressor
The thing that was made to be made. 4) An inverter described in 3) above is provided.
Air conditioners that use a single outdoor unit to control multiple indoor units
A multi-room air conditioner controlled individually. [0011] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
It will be described in detail based on FIG. FIG. 1 shows an invar according to an embodiment of the present invention.
It is a block diagram showing an air conditioner which has a fan. Same figure
As shown in FIG.
Acon, for example, a single unit installed on the rooftop of a building, etc.
An outdoor unit 1 is connected to the outdoor unit 1 via a refrigerant pipe 2.
For example, indoor units installed in each room of a building
3 ₁, ..., 3_nConsists of Outdoor unit 1 and each indoor unit
3₁~ 3_nAre fan motors 4 and 7, respectively.₁~ 7_nas well as
Heat exchangers 11, 12₁, ..., 12_nWith
In addition, the outdoor unit 1 includes compressors 13 and 14 for compressing the refrigerant.
have. As described above, this embodiment uses two compressors.
13, 14 of which the compressor 13
Is to control the motor which is the drive source by the inverter.
Inverter control compressor
The motor 14 is a constant rotation motor that does not perform inverter control.
It is a constant speed compressor used as a drive source. And these
Inverter control compressor 13 and constant speed compressor
When driving the compressor 14, first, the inverter control compressor
13 to cope with low loads, and
When the output of the barter control compressor 13 becomes maximum
To reduce the output of the inverter control compressor 13 to zero.
The constant speed compressor 14 is driven in the vicinity thereof,
Inverter control compressor
To cope with load fluctuations by increasing the output of the
It has become so. At this time, the inverter control
Lesser 13 and constant speed compressor 14 have the same output.
Used. That is, required by the multi air conditioner
If the rated output is 10 hp, the inverter control
Rated output of compressor 13 and constant speed compressor 14
All use 5 horsepower. In this case, of course, 10
Use one inverter-controlled compressor of horsepower.
But two compressors 13 as in this embodiment,
14 to reduce the size of these control units.
Large size due to the downsizing of parts
This has the advantage that the cost can be reduced. Refrigerant on the discharge side of both compressors 13 and 14
Oil separators 15 and 16 are provided in the pipe 2.
You. These oil separators 15 and 16 are compressed
High-pressure and high-pressure compressed and discharged by
The lubricating oil contained in the refrigerant is separated, and the capillaries 17, 1
For returning to both compressors 13, 14 via 8
It is. Thereby, the sliding parts of the compressors 13 and 14
Seizure is prevented. By the way, compressor 13,
Reference numeral 14 denotes a motor and a number of slides such as a compression unit driven by the motor.
Moving parts, and lubricating oil is sealed to perform these lubrication.
But this lubricating oil flows out with the refrigerant and
If it is small, there is a possibility that seizure may occur in the sliding portion. Refrigerant piping on the discharge side of the oil separator 16
2 is provided with a check valve 19. This check valve 19 is
Compressed by the drive of the inverter control compressor 13
The pressure of the high-pressure refrigerant gas is
This is for preventing the action on the discharge side. this
Thus, as described above, the inverter control compressor 1
When the constant-speed compressor 14 is started after 3
To prevent overload due to excessive load acting on
Can be. In this embodiment, the inverter control compressor
13 starts before the constant speed compressor 14
A check valve is provided on the oil separator 15 side for control.
You don't have to. The four-way switching valve 20 is provided for the multi air conditioner.
Switch the flow direction of the refrigerant between the cooling operation and the heating operation.
It is for replacement. The accumulator 21 is a refrigerant
For separating gas and liquid. Cooling and heating
The refrigerant that has completed the predetermined heat exchange associated with the rotation is a mixture of gas and liquid.
The mixed gas-liquid mixture is in
When returning to the compressors 13 and 14, the compressor 1
3 and 14 are to compress not only the refrigerant gas but also the refrigerant liquid.
Become. Such liquid compression is applied to the compressors 13 and 14.
Avoid overloading and cause failures such as seizures.
I have to. Therefore, the accumulator 21 performs gas-liquid mixing.
Takes refrigerant in the state and performs gas-liquid separation, and only refrigerant gas
Return to the compressors 13 and 14. expansion
The valve 22 includes a capillary 23 and a check valve 2 connected in series.
4 in the vicinity of the heat exchanger 11 so as to be in parallel with each other.
It is arranged on the pipe 2. The expansion valve 22 is activated by an electric signal.
Electronic expansion valve that can regulate the flow rate of refrigerant by adjusting the opening of the
Yes, the refrigerant is mainly circulated during the heating operation, and the heat exchanger 11
To function as an evaporator. Capillaries
The refrigerant 23 and the check valve 24 allow the refrigerant to flow during the cooling operation,
It is for making the heat exchanger 11 function as a condenser.
You. It is to be noted that the refrigerant may flow through the expansion valve 22 even during heating.
In this case, the capillary 23 and the check valve 24
Is not necessary. However, through the expansion valve 22
When the refrigerant is caused to flow, the flow noise of the refrigerant is large. There
Then, the expansion valve 22 is throttled, and the capillary 23 and the check valve 24
The flow noise is reduced by circulating the refrigerant through the air.
That is, the capillary 23 and the check valve 24 are effective in reducing noise.
It is for obtaining fruit. Inflation with similar function
Valve 25₁, ..., 25_n, Capillary 26₁, ...
・ 、 26_nAnd check valve 27₁, ..., 27_nIs in each room
Machine 3₁~ 3_nIn each heat exchanger 12₁~ 12_nNeighborhood of
Is also provided. Capillary 23 and check valve as described above
The noise reduction effect of 24 is in a room where people are often
Each installed indoor unit 3₁~ 3_nAlso particularly useful on the side
It becomes In addition, in FIG.₁, ...
・, 30_n, 34 and 35 are capillaries, all of which are cold.
Arranged in the middle of refrigerant pipe 2 so as to have flow resistance to the medium
Have been. In such a multi air conditioner, cooling operation is performed.
When performing the operation, the four-way switching valve 20 is switched to
The refrigerant flows through the path indicated by the solid arrow. That is,
High-temperature and high-pressure refrigerant compressed by compressors 13 and 14
The gas passes through the four-way switching valve 20 and reaches the heat exchanger 11. This
Here, the refrigerant gas is supplied to the fan driven by the fan motor 14.
Cools by exchanging heat with the air to be sent, condenses and cools
It becomes a liquid medium, and the capillary 23, the check valve 24 and the refrigerant pipe
2 through each indoor unit 3₁~ 3_nLeads to. As a result, the refrigerant
Each indoor unit 3₁~ 3_nExpansion valve 25₁~ 25_nPass through
Expands into a gas-liquid mixed state when the heat exchanger 12₁~ 1
2_nAnd the fan motor 7₁~ 7_nDriven by
It exchanges heat with the air delivered by the air, and is heated and evaporated. This
Here, the refrigerant becomes a refrigerant gas in a state mixed with the liquid,
It reaches the accumulator 21 via the four-way switching valve 20.
This accumulator 21 separates gas and liquid into refrigerant gas.
Return to the compressors 13 and 14. Thus, cooling operation
, The heat exchanger 11 on the outdoor unit 1 side serves as a condenser.
Works, indoor unit 3₁~ 3_nSide heat exchanger 12₁~ 12 _nBut
Functions as an evaporator. On the other hand, when the heating operation is performed,
The path indicated by the dotted arrow in the figure by switching the valve exchange 20
The refrigerant is caused to flow. That is, the compressors 13 and 14
From the four-way switching valve 20, each indoor unit 3₁
~ 3_n, Capillary 26₁~ 26_n, Check valve 27₁~ 2
7_n, Expansion valve 22, heat exchanger 11, four-way switching valve 20,
And the compressors 13 and 14 through the accumulator 21
Return to At this time, indoor unit 3₁~ 3_nSide heat exchanger 12₁
~ 12_nFunctions as a condenser, and the heat exchanger on the outdoor unit 1 side
11 functions as an evaporator. Each indoor unit 3₁~ 3_nSection where was installed
The room temperature of the indoor unit is 3 ₁~ 3_nSide and outdoor unit
By exchanging information with the first side via a communication line,
Indoor unit 3₁~ 3_nSupports air conditioning conditions according to requests from the side
The expansion valves 22, 25₁~ 25_nIndividually adjust the opening of
Control by doing. Transfer and control of such information
Is the outdoor unit 1 and each indoor unit 3₁~ 3_nEach has
This is performed through a control unit such as a microcomputer. FIG. 2 shows a multi-conditioner according to the above embodiment.
FIG. 3 is a block diagram showing a control system of the electric motor of FIG. The same
In the figure, the indoor unit is indoor unit 3₁Shown only on behalf of other
Indoor unit 03_nHas the same configuration. FIG.
As shown in FIG. 1, the outdoor unit 1 has a heat exchanger 11 (see FIG. 1).
The rotation is controlled by the fan motor 4 and the inverter 5).
Motor 6 for driving the compressor
The rotation of the compressor 14 is not controlled by the
(See FIG. 1)
The outdoor unit 3 having the source frequency detection unit 33₁Heat on the side
Exchanger fan motor 7₁have. Here inva
Data 5 is the indoor unit 3₁Inverter required frequency generator 8
Requested frequency A transmitted by₀Inverter frequency
The electric power of the frequency determined by the fixing unit 9 is
Is controlled so as to be supplied. That is, the inverter
Rotation uniquely determined by the frequency determined by the wave number determination unit 9
The speed of the compressor motor 6 is controlled.
ing. Indoor unit 3 at this time₁Requested frequency transmitted by
A₀Is determined according to the air conditioning conditions such as the set temperature.
Sent to the inverter frequency determination unit 8 of the outdoor unit 1 via the communication line
Will be issued. Here, the inverter frequency determination unit 9 is provided with a power supply
Referring to the frequency of the power supply 10 detected by the frequency detector 33,
If the power frequency is 50 Hz, the required frequency
A₀Frequency A corresponding to₁And the correction value α
Wave number A₁'Is supplied to the compressor motor 6.
Therefore, in this case, the compressor motor 6
Number A₀Frequency A corresponding to₁Correction frequency A greater than
₁'Controls the number of rotations. The correction value α at this time is
When the power frequency becomes 50 Hz, the fan motor
4, 7₁Speed and the speed is not controlled by the inverter 5
The rotation speed of the compressor motor 32 rotating at a constant speed is 60
Air conditioning capacity with relative decline compared to Hertz
Compensates for reduced power and has the same air conditioning capacity as at 60 Hz
The rotation speed is set so that The correction value α in this case is
Required frequency A₀Inverter frequency as a map corresponding to
The number is stored in the number determining unit 9. In this embodiment, the power supply frequency detector
33 detects that the frequency of the power supply 10 is 50 Hz
In this case, the required frequency is
Number A ₀Frequency A corresponding to₁To the correction value α. This
As a result, the inverter frequency determination unit 9 determines that the correction frequency A₁’
To supply compressor power to compressor motor 6.
Data 05 is controlled. Therefore, the compressor motor
6 is the correction frequency A₁’Power
Data 4, 7₁Of rotation speed of compressor and compressor motor 3
2, the rotation speed of the compressor motor 32
Compensates for the decrease and is the same as when the power supply frequency is 60 Hz.
Demonstrate the air conditioning capacity. Incidentally, as in the above embodiment, the multi airco
It is not necessary to limit to The present invention relates to an outdoor unit and an indoor unit.
Can also be applied favorably to a pair of air conditioners. Ma
Further, as shown in FIG.
Although it is configured to detect the wave number,
Since it is generally known, the frequency corresponding to this power supply frequency is
Set the setting switch that can be set to the power frequency detector
33 may be provided instead. In this case the inverter
The frequency determination unit 9 refers to the frequency set in the setting switch.
Required frequency A₀Frequency A corresponding to₁Or supplement
Positive frequency A₁’. [0023] The present invention has been described in detail with the embodiments.
As described above, the inventions described in [Claim 1] and [Claim 2]
According to the description, when the power frequency is 50 Hz, the power frequency is
It has the same air conditioning capacity as when the number is 60 Hz.
Can rotate the electric motor for driving the compressor
So, 50 Hz is the same as 60 Hz
Air conditioning can be performed under the following conditions. [Claim 3]
According to the invention, the inverter control compressor and the constant speed
Install a compressor to handle a wide range of load fluctuations
So that one inverter-controlled compressor
Compared to this case, the size of the control system components can be reduced and the cost can be reduced.
Can be achieved. In the case of the present invention,
It has a constant speed motor that operates a constant speed compressor,
The rotation speed of this constant speed motor is 60 Hertz in the case of 50 Hertz.
Is slower than in the case of
Cooling capacity is reduced not only by the motor but also by the constant speed motor
However, in the present invention, it is caused by the constant speed motor.
The same operation as in the case of 60 Hz is complemented by the decrease in cooling capacity.
Inversion can be performed. [Claim 4]
According to the multi-room air conditioner, [Claim 1]-
The same effect as the invention described in [Claim 3] is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an air conditioner according to an embodiment of the present invention. FIG. 2 is a block diagram showing a control system of the electric motor according to the embodiment. FIG. 3 is an explanatory view conceptually showing a multi-conditioner system. FIG. 4 is a block diagram showing a control system of a motor of a multi-air-conditioning system according to the related art. [Explanation of Signs] 1 outdoor unit 2 refrigerant piping 3 _{1 to} 3 _n indoor unit 4 fan motor 5 inverter 6 compressor motor 7 fan motor 8 inverter required frequency generation unit 9 inverter frequency determination unit
11 Heat Exchanger 12 ₁ -12 _n Heat Exchanger 13 Inverter Control Compressor 14 Constant Speed Compressor 32 Compressor Motor 33 Power Frequency Detector

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Shinichi Isuzu             3-chome, Asahicho, Nishibiwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture             No.1 Mitsubishi Heavy Industries, Ltd. air conditioner production             Inside

Claims (1)

Claims: 1. An air conditioner having an inverter configured to control a motor for driving a compressor by an inverter, wherein a power supply frequency is detected, and the detected power supply frequency is 50 Hz. An air conditioner having an inverter, wherein the motor is controlled by an inverter so that the motor for driving the compressor rotates so as to exhibit the same air-conditioning capacity as when the power supply frequency is 60 Hz. 2. An air conditioner having an inverter configured to control an electric motor for driving a compressor by an inverter, the air conditioner having a setting switch for setting a frequency corresponding to a power supply frequency, wherein the setting switch is set to the setting switch. When the power supply frequency is 50 Hz, the inverter controls the motor for driving the compressor so that the compressor drive motor rotates so as to exhibit the same air-conditioning ability as when the power supply frequency is 60 Hz. An air conditioner having an inverter. 3. An air conditioner having an inverter according to claim 1 or 2 is driven by an inverter-controlled compressor driven by an inverter-controlled motor and a constant-rotation motor that does not perform inverter control. It has a constant-speed compressor.First, the inverter-controlled compressor is driven to cope with a low load, and when the output of the inverter-controlled compressor becomes maximum as the load increases, the output of the inverter-controlled compressor becomes zero or zero. An air conditioner having an inverter, characterized in that a constant speed compressor is driven in the vicinity thereof and the output of the inverter control compressor is increased in response to a subsequent increase in load. 4. An air conditioner having an inverter according to claim 3 is a multi-room air conditioner in which one outdoor unit individually controls a plurality of indoor units. An air conditioner having an inverter.