JP3221232B2 - Heat pump refrigeration system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type refrigeration system, and more particularly, it comprises a plurality of outdoor units each having a compressor and an outdoor heat exchanger and one indoor unit. The present invention relates to a heat pump type refrigeration apparatus whose capacity is adjusted.

[0002]

2. Description of the Related Art A conventional refrigeration system having a plurality of compressors and controlling the number of operating compressors to adjust the capacity of an indoor unit is disclosed in, for example, Japanese Patent Laid-Open No. 2-248.
It is known as shown in Japanese Patent No. 674.

[0003] This refrigeration apparatus, as schematically shown in FIG.
Using two compressors A and B, one water-cooled condenser C is connected to the discharge sides of the compressors A and B, and a branch pipe is connected to a high-pressure liquid pipe D connected to the outlet side of the condenser C. E and F are provided, and expansion valves G and H are connected to the branch pipes E and F, and the branch pipes E and F are connected to the air-cooled evaporator K.
The system is connected to the suction side of each of the compressors A and B. The number of operating compressors A and B is controlled according to the refrigeration load, so that the refrigeration operation can be performed with the capacity according to the load. Things.

[0004] Further, the refrigerating apparatus includes the compressors A and B.
If the operation of the compressor A or B is stopped due to an abnormality during the low-capacity operation with one of the
In order to prevent the operation of the entire apparatus from being stopped, the stopped compressor B or A is operated so that the compressor A or B to be stopped can be backed up to reduce the temperature change with respect to the refrigeration load. In addition, the temperature control can be continuously performed.

[0005]

In the conventional refrigeration system described above, the compressor A or B which is stopped due to an abnormality by operating the stopped compressor B or A can be backed up, and the temperature control can be performed. Control can be continued,
The only consideration is to operate the stopped compressor to perform backup, so when using a large number of compressors, the outdoor unit to be backed up cannot be specified, and therefore the operation time of the outdoor unit is limited to each outdoor unit. As a result, the operation time of a specific outdoor unit becomes longer, the life of other compressors becomes shorter, and the durability of the entire apparatus deteriorates.

On the other hand, in the conventional refrigeration system described above,
Since the refrigerant system does not form an independent refrigerant circulation system for each of the compressors A and B, this refrigeration system is applied to a heat pump refrigeration system, and a heating operation is performed by using the condenser C as an outdoor unit as an evaporator. When the evaporator is frosted and defrosted in the reverse cycle, the heating operation is interrupted, and during the cooling operation, the compressor is stopped to prevent the evaporator K from freezing. When the freezing is prevented, the cooling operation is interrupted, and the temperature control becomes inaccurate.

An object of the present invention is to adjust the capacity by controlling the number of operating outdoor units, and not only when the outdoor units during operation stop abnormally, but also when the outdoor heat exchanger is defrosted and when indoor heat exchange is performed. When the operation is not in a steady state, such as when the operation of preventing the freezing of the unit is performed, the back-up can be performed by using the stopped outdoor unit, so that the operation of the outdoor unit can be performed while maintaining the temperature control accurately. The point is that the time can be prevented from becoming uneven, and the durability of the entire apparatus can be improved.

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 comprises a large number of outdoor units 1 provided with a compressor 2 and an outdoor heat exchanger 3, an indoor heat exchanger 7 and A single indoor unit 10 having an indoor fan 8, a refrigerant circulation system is provided between the outdoor unit 1 and the indoor heat exchanger 7, and the indoor unit 10 is controlled by controlling the number of operating outdoor units 1. In the heat pump type refrigerating apparatus having the capacity adjustment, the outdoor unit 1 is provided with the unsteady operation detecting means 19 for detecting the unsteady operation of the outdoor unit 1, and at the time of the low capacity operation by the unit control, When the detection means 19 outputs, the stopped outdoor unit 1 is operated,
A backup unit 20 for backing up the outdoor unit 1 that operates in an irregular state, and a cab of the outdoor unit 1 that is required according to the load
The number of outdoor units 1 that increases or decreases based on the
Rotation set at a fixed rotation every time
Control means 18 and the rotation control means 18
Backup selection means 21 for selecting the outdoor unit 1 to be backed up based on the set rotation and outputting an operation command is provided.

[0009]

Further, the invention according to claim 2 includes a number of indoor heat exchangers 7 corresponding to a number of outdoor units 1, and each of these indoor heat exchangers 7 and each of the outdoor units 1 An independent refrigerant circulation system is provided to enable the defrost operation of the outdoor heat exchanger 3 for each of these refrigerant circulation systems, and the defrost operation is detected as unsteady operation by the unsteady operation detection means 19. in addition, similar third aspect of the present invention in claim 2, on which is provided a plurality of independent refrigerant circulation system, for each of these respective coolant circulation system, and stop the operation of the outdoor unit 1, the indoor heat exchanger 7 can be prevented from being frozen, and the anti-freezing operation is detected as unsteady operation by the unsteady operation detecting means 19.

[0011]

According to the first aspect of the present invention, the unsteady operation of each of the outdoor units 1 is detected, and the backup means 20 and the backup selection means 21 are provided. While the capacity of the indoor unit 1 can be adjusted, at the time of low-capacity operation, an unsteady operation that is not a steady operation such as stopping the operating outdoor unit 1 due to a failure or entering a defrost operation of the outdoor heat exchanger 3 is performed. In this case, the stopped outdoor unit 1 can be operated and its backup can be performed. Therefore, the operation can be continued without interrupting the operation of the entire device, and therefore, it is possible to prevent the temperature control fluctuation due to the interruption of the operation. is there.

[0012]

Moreover, the outdoor unit 1 to be backed up
Is it is so arranged to select on the basis of the rotation to be set in rotation control means 18, the averaging of the operation time of the outdoor unit 1 when the chronograph coupling causes in accordance with the variation of the load are lines example, the durability of the entire device It can be further improved.

According to the second aspect of the present invention, an independent refrigerant circulation system is provided between the plurality of indoor heat exchangers 7 corresponding to the outdoor units 1 and the outdoor units 1, respectively.
After enabling the defrost operation of the outdoor heat exchanger 3 for each of these refrigerant circulation systems, and detecting this defrost operation as an unsteady operation, the defrost operation is performed while performing the defrost operation for each of the refrigerant circulation systems. Even in the case where the outdoor unit 1 is stopped, the backup operation can be performed by the stopped outdoor unit 1, temperature fluctuations during the defrost operation can be prevented, and shortage of the heating capacity at the time of heating can be eliminated.

Further, according to the invention described in claim 3 , according to claim 2
As with the described invention, an independent refrigerant circulation system is provided,
For each of these refrigerant circulation systems, the operation of the outdoor unit 1 is stopped, and the indoor heat exchanger 7 can be prevented from freezing by an off cycle. The outdoor unit 1 that is stopped while performing the anti-freezing operation while performing the anti-freezing operation in the system
This makes it possible to perform a backup operation, prevent a fluctuation in temperature regulation during the anti-freezing operation, and eliminate a shortage of cooling capacity during cooling.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat pump type refrigeration system shown in FIG. 1 comprises a compressor 2, an outdoor heat exchanger 3, an expansion mechanism 4, and a four-way switching valve 5.
And six indoor heat exchangers 7 and indoor fans 8 corresponding to the outdoor units 1 are provided in a casing 6, and a blowing chamber 9 is provided in the casing 6. A single indoor unit 10, and an independent refrigerant circulation system is formed between each of the outdoor units 1 and the indoor heat exchanger 7 via a gas-side connecting pipe 11 and a liquid-side connecting pipe 12, The indoor unit 10 is controlled by controlling the number of operating units of the outdoor unit 1.
The ability to adjust the ability.

More specifically, as shown in FIG. 2, the indoor unit 10 has a suction thermo 13 for detecting a suction temperature.
And a controller 14 comprising a computer provided with each means having the control functions (1) to (6) described below. (1) Detection value TH by suction thermo 13 and temperature setting device 1
Outdoor unit 1 based on the temperature difference from the set temperature TS set in step 5
The required number of operation is set, a predetermined differential is set as shown in FIG. 7, and the capacity control means 16 performs step control in six steps. (2) The indoor fan 8 is turned on by turning on the operation switch SW, Five seconds after the indoor fan 8 is turned on, the No. 1 outdoor unit 1 of the address 0 among the outdoor units 1 is operated, and after 5 seconds, the No. 2 outdoor unit of the address 1 is operated according to the number of operation requests. The machine 1 is operated, and thereafter, the N of the address 5 is similarly set according to the requested number.
o. Sequential start control means 17 for sequentially operating up to six outdoor units 1 (3) The detection value TH and the set value T by the suction thermo 13
Outdoor unit 1 required according to temperature difference from S, that is, load
Rotation control means 18 that sets the number of outdoor units 1 to increase or decrease based on the number of operating units in a fixed rotation every time the requested number of units changes (4) Detects unsteady operation of these outdoor units 1 for each outdoor unit 1 (5) During low-capacity operation by controlling the number of units, when the detection unit 19 outputs, the stopped outdoor unit 1 is operated to back up the outdoor unit 1 in the unsteady operation. Means 20 (6) Backup selection means 21 for selecting an outdoor unit 1 to be backed up and selecting an outdoor unit 1 having a long stop time from among the stopped outdoor units 1 and outputting an operation command. When the rotation unit 18 is provided, the outdoor unit 1 to be backed up is selected based on the rotation set by the rotation control unit 18. Therefore, there is no need to equip it further. The reason is that when the unsteady operation is detected, the outdoor unit 1 is regarded as being stopped, so that the number of operating units is increased correspondingly to the required number and the outdoor unit 1 to be increased is increased. This is because the selection can be made based on the rotation by the rotation control means 18.

Further, each of the means 16 to 21 is configured based on a function built in the controller 14,
The unsteady operation by the unsteady operation detecting means 19 includes: (1) abnormal operation in which the compressor 2 of the outdoor unit 1 or the outdoor fan 22 attached to the outdoor heat exchanger 3 stops due to a failure; Defrost operation in which the outdoor heat exchanger 3 is frosted and performs a defrost operation in accordance with an instruction from the deicer 23. (3) In order to prevent the indoor heat exchangers 7 from freezing during cooling, 7 is an anti-freezing operation for stopping the operation of the outdoor unit 1 and preventing freezing in an off cycle, wherein the abnormal operation is detected based on the stop of the outdoor unit 1, and the defrost operation is performed from the deicer 23. The detection is performed based on the instruction, and the anti-freezing operation is further detected based on the detection of the freezing condition from the heat exchange thermometer 24 connected to each of the indoor heat exchangers 7.

The controller 14 and the indoor unit 10
The control panel provided for the outdoor unit 1 and the control panel provided for each outdoor unit 1 are connected by a transmission line, and the abnormal operation of the outdoor unit 1 due to this transmission abnormality can be included in the abnormal operation as the abnormal transmission operation. . In the above configuration,
The operation control of the outdoor unit 1 is performed in accordance with an instruction from the heat exchange thermo 24. When the operation command of the heat exchange thermo 24 is turned on from the controller 14, the operation according to the instruction of the heat exchange thermo 24 is performed. The operation of the outdoor unit 1 corresponding to the indoor heat exchanger 7 provided with the heat exchange thermo 22 is to be stopped, and the operation of the outdoor unit 1 is stopped by turning off the operation command of the heat exchange thermo 24. Become.

Next, the operation of the refrigeration system configured as described above will be described with reference to the flowcharts shown in FIGS. When the operation switch SW is turned on, the indoor fan 8 is turned on.
Is driven, and the number of requested operation is set based on the temperature difference between the set temperature TS set by the setter 15 and the detected temperature TH detected by the suction thermo 13. After a lapse of 5 seconds, starting from the No. 1 outdoor unit 1 at address 0 to the No. 6 outdoor unit 1 at address 5 on the basis of the requested number, the units are sequentially started every 5 seconds.

First, the currently operating outdoor unit 1, the stopped outdoor unit 1 and the outdoor unit 1 in the defrost operation are determined according to the flowchart of the package 1 shown in FIG. That is, the determination count N of the outdoor unit 1 to be determined is set to 0.
The operation is started with the number of operating units A set to 0 (step 1), and it is determined whether or not the operation is sequentially performed from the No. 1 outdoor unit at address 0 (step 2).
If YES, that is, if the outdoor unit 1 is operating, then it is determined whether or not the outdoor unit 1 is performing the defrost operation (step 3). If YES in this determination, that is, if the outdoor unit 1 is not performing the defrost operation. Increments the number of operating units (step 4) and increments the determination count N (step 5).

If the determination in step 2 is NO, that is, if the operation is stopped, steps 3 and 4
Is passed, and the determination count N is incremented in step 5, and if the determination in step 3 is NO, that is, if the defrost operation is being performed, this outdoor unit 1
The operation is regarded as a stop, and the control passes the step 4 to increment the discrimination count N in the step 5.

Then, in step 6, it is determined whether or not the determination count N has become equal to or greater than the number of outdoor units 1 to be used (six in the above-described embodiment).
Returns to the start if YES.

Thus, by the above judgment, the address of the outdoor unit 1 being operated and the outdoor unit 1 being stopped, the number of the operating units and the number of stopped units can be determined, and the outdoor unit 1 which is in the defrost operation can be determined. You can.

Next, the control for increasing or decreasing the load, that is, when the temperature difference between the set value TS and the detected temperature TH changes to increase or decrease the number of operating outdoor units 1 will be described with reference to FIG. The description will be made in accordance with the flowchart and the flowcharts of the increasing routine and the decreasing routine shown in FIGS.

In the package 2, after the start (step 1), first, it is determined whether or not the current number A of operating outdoor units is smaller than the required number B required according to the load (step 2). In other words, if the operating number A is smaller than the requested number B,
In the case of NO, that is, when the number of operating vehicles is larger than the required number, the decrease routine shifts.

First, the increase routine will be described with reference to FIG. 5. The discrimination count N of the outdoor unit 1 to be discriminated at the time of start is described.
Is set to 0, and the address of the outdoor unit 1 to be operated next is set to M (step 1).
To the outdoor unit 1 at address 5 are sequentially determined.

Then, in steps 2, 3 and 4, it is determined whether or not there is an abnormal operation due to an abnormal operation failure due to a transmission abnormality and an anti-freezing operation. If both are YES, that is, if the above-mentioned unsteady operation is not performed, Then, it is determined whether or not the outdoor unit 1 is operating (step 5), and YE
In the case of S, that is, when the vehicle is operating, the sequential start timer of the outdoor unit 1 of the next address to be operated is set for 5 seconds (step 6), and the address of the next outdoor unit 1 is incremented (step 7). ), The discrimination count N is also incremented (step 8), and the incremented outdoor unit 1
Is determined to be the last address (address 5 in this embodiment) (step 9). If YES, the address is reset to 0 (step 10). It is determined whether or not the number is equal to or greater than the number of the machines 1 (step 11). If NO, the process returns to step 2, and if YES, the process returns to step 1 of the package 2.

If the determination in step 5 is NO, that is, if the operation has been stopped, it is determined whether or not the timer for starting has timed out sequentially (step 12). Is turned on, and the outdoor unit 1 at this address is operated (step 13). Therefore, address 0
When the No. 1 outdoor unit 1 is stopped, the outdoor unit 1 to be operated next is designated to this No. 1 outdoor unit 1 (address 0 designation), and an operation command is issued to the heat exchange thermo 24. When the No. 1 outdoor unit 1 is operating and the No. 2 outdoor unit 1 to be determined next is stopped, the No. 2 outdoor unit 1 is operated next. The designated outdoor unit is designated (address 1 is designated), and the outdoor unit 1 is operated.

After the operation command of the outdoor unit 1 is instructed, the address of the next outdoor unit 1 is incremented (step 14), and the incremented address of the outdoor unit 1 becomes the final address (this embodiment). Then, it is determined whether or not address 5) has been reached (step 15). If YES, the address is returned to 0 (step 16), the address of the next cab outdoor unit 1 is stored as M (step 17), and It returns to step 1 and prepares for the next judgment.

Therefore, when an increase request is made during the operation after the start, the determination is sequentially started from the previously stored address of the outdoor unit 1, and the control in the increase rotation in which the operation is sequentially performed as shown in FIG. Is performed.

If the defrost operation is being performed in the predetermined outdoor unit 1 under the above control, the operation is considered to be stopped and is not counted as the number of operating units. Therefore, it is determined that the number of operating units is smaller than the requested number. In accordance with the above-described increase routine, the stopped outdoor unit 1 is operated based on the increased rotation, so that the outdoor unit 1 can be backed up. It is chosen.

In any of the abnormal transmission operation, the abnormal operation due to the failure, and the anti-freezing operation, the outdoor unit 1 is stopped. Based on the determination that the number of operating units is smaller than the number of operating units, the stopped outdoor unit 1 is operated to perform the backup operation. In this case as well, the outdoor unit 1 with the long stopping time backs up based on the increased rotation. It is selected as the outdoor unit 1.

Next, the reduction routine will be described with reference to FIG. At the start (step 1), the number of operating units at that time is assumed to be A, and determination is sequentially performed from the outdoor unit 1 at the address M stored in the increasing routine (step 2).

First, at step 2, it is determined whether or not the address M stored in the increasing routine is operating. Since this address M is the address of the next cab outdoor unit 1, the determination at this step 2 is NO. In step 8, the address M is incremented, and the incremented address is stored.

Then, it is determined whether the address of the outdoor unit 1 incremented by repeating the above determination is the final address (address 5 in this embodiment) (step 9), and if YES, the address is determined. Is returned to 0 (step 10). Further, in step 11, the address stored in step 8 is compared with the address of the next cab unit 1 stored in the increasing routine, and if NO, that is, if they do not match, the process returns to step 2. Therefore, by stopping the outdoor unit 1 that has been stopped by repeating the above determination, the outdoor unit 1 that has been driven first
Is the target of the determination, and the determination in step 2 is YES. If the determination in step 2 is YES, that is, if the vehicle is operating, it is determined whether or not there is a backup operation of the defrost operation (step 3). If YES, the outdoor unit at address M determined in step 2 is determined. It is determined whether or not No. 1 is not performing a defrost operation (step 4).
In the case of S, that is, when the defrost operation is not performed,
Next, it is determined again whether or not the number of operating units A is equal to or greater than the required number of units B (step 5). If YES, the number of operating units A is decremented (step 6), and the heat exchange thermometer corresponding to the outdoor unit 1 at the address is determined. The operation command of step 24 is turned off, and the operation is stopped (step 7).

Also in this case, the address of the outdoor unit 1 is incremented, and the incremented address is stored (step 8). In step 11, it is determined whether or not the address is the first address for which the start of the determination is started.
In the case of, that is, from the state address, the judgment is the total number of the outdoor units 1 to be used, and it is judged that the judgment has been completed, and the process is returned. In the case of NO, the process is returned to step 2 and the above judgment is continuously performed. It is done. Therefore, if there is a reduction request during operation after startup, the outdoor unit 1 whose operation has been started in accordance with the sequential start control, that is, the outdoor unit 1 whose operation time is long, is sequentially stopped.

In the case of a full stop, the next start is performed from the outdoor unit 1 at the next address with respect to the outdoor unit 1 at the last address at the time of the full stop. When the operation is restarted after the operation switch is turned off, the operation is started from the outdoor unit No. 1 at address 0 based on the start control sequentially. However, the operation time is substantially reduced by adjusting the capacity after operation. It will be uniform.

As described above, according to the embodiment shown in the drawings, when the operation switch SW is turned on and started, after the indoor fan 8 is driven, the No. of the address 0 is determined according to the requested number determined by the load. 1 The outdoor units 1 are sequentially started, and when the requested number changes due to a change in load, as shown in FIG. 8, the operation is sequentially performed at the time of increase, and the operation is sequentially stopped at the time of decrease as shown in FIG. Starting after a full stop, a rotation operation performed from the outdoor unit 1 of the next rank that was last operated at the time of a full stop is executed,
The capacity of the indoor unit 10 is step-controlled by controlling the number of operating units.

When a predetermined outdoor unit 1 is stopped to control the capacity, the operating outdoor unit 1 stops due to a failure, transmission stops, or indoor heat exchange during cooling. The unit 7 is stopped to prevent freezing, or when the capacity of the indoor unit 10 is reduced due to an unsteady operation such as a case where the outdoor heat exchanger 3 performs a defrost operation during heating, the operation is stopped. The backup operation can be performed by the outdoor unit 1 having a long stop time in accordance with the rotation operation described above. Therefore, the operation time of each outdoor unit 1 can be averaged while the temperature control in the indoor unit 10 can be performed without fluctuation, and the durability of the entire apparatus can be improved.

In the embodiment described above, the number of the outdoor units 1 is six, but the number of the outdoor units 1 used may be more.
Although the same number of the indoor heat exchangers 7 are provided corresponding to the outdoor units 1 to form an independent refrigerant circulation system, the number may be smaller than the number of the used outdoor units 1 or may be one.

In the above embodiment, when the outdoor heat exchanger 3 of the outdoor unit 1 is defrosted, it is not necessary to limit the number of defrost operation units, and the number of defrost operation units is limited to a specific number. It is preferable to sequentially perform the defrost operation of the other outdoor units 1. Further, it is preferable that the sequential start control is performed for each unit. However, when the number of used units is large, it may be performed for every two units.

[0043]

According to the first aspect of the present invention, the outdoor unit 1
In each case, the unsteady operation is detected, and the backup means 20 and the backup selection means 21 are provided. Therefore, while the capacity of the indoor unit 1 can be adjusted by controlling the number of operating outdoor units 1, when the low capacity operation is performed, Outdoor unit 1 in operation
When an unsteady operation is performed that is not a steady operation such as shutting down due to a failure or entering a defrost operation of the outdoor heat exchange device 3, the stopped outdoor unit 1 can be operated and its backup can be performed. Accordingly, the operation can be continued without interrupting the operation of the entire apparatus, and therefore, it is possible to prevent temperature regulation fluctuation due to the interruption of the operation.

[0044]

In addition, the outdoor unit 1 to be backed up
Is it is so arranged to select on the basis of the rotation to be set in rotation control means 18, the averaging of the operation time of the outdoor unit 1 when the chronograph coupling causes in accordance with the variation of the load are lines example, the durability of the entire device It can be further improved.

According to the second aspect of the present invention, an independent refrigerant circulation system is provided between a number of indoor heat exchangers 7 corresponding to the outdoor units 1 and the outdoor units 1, respectively.
After enabling the defrost operation of the outdoor heat exchanger 3 for each of these refrigerant circulation systems, and detecting this defrost operation as an unsteady operation, the defrost operation is performed while performing the defrost operation for each of the refrigerant circulation systems. Even in the case where the outdoor unit 1 is stopped, the backup operation can be performed by the stopped outdoor unit 1, temperature fluctuations during the defrost operation can be prevented, and shortage of the heating capacity at the time of heating can be eliminated.

Further, according to the invention described in claim 3 , according to claim 2,
As with the described invention, an independent refrigerant circulation system is provided,
For each of these refrigerant circulation systems, the operation of the outdoor unit 1 is stopped, and the indoor heat exchanger 7 can be prevented from freezing by an off cycle. The outdoor unit 1 that is stopped while performing the anti-freezing operation while performing the anti-freezing operation in the system
This makes it possible to perform a backup operation, prevent a fluctuation in temperature regulation during the anti-freezing operation, and eliminate a shortage of cooling capacity during cooling.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing an embodiment of the apparatus of the present invention.

FIG. 2 is a block diagram of operation control.

FIG. 3 is a flowchart of a package 1;

FIG. 4 is a flowchart of a package 2;

FIG. 5 is a flowchart of the outdoor unit operation increase.

FIG. 6 is a flowchart of outdoor unit operation reduction.

FIG. 7 is an explanatory diagram showing capacity adjustment of an indoor unit.

FIG. 8 is an explanatory diagram showing an example of a rotation operation.

FIG. 9 is a schematic view showing a conventional example.

[Explanation of symbols]

1 outdoor unit 2
Compressor 3 Outdoor heat exchanger 7
Indoor heat exchanger 8 Indoor fan 10
Indoor unit 18 Rotation control means 19
Unsteady operation detection means 20 Backup means 21
Backup selection means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-74531 (JP, A) JP-A-1-163547 (JP, A) Jikai Sho 54-164152 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F25B 47/02 550 F24F 11/02 F25B 13/00

Claims (3)

(57) [Claims] 1. An indoor unit having a plurality of outdoor units (1) having a compressor (2) and an outdoor heat exchanger (3), and one indoor unit having an indoor heat exchanger (7) and an indoor fan (8). (10), a refrigerant circulation system is provided between the outdoor unit (1) and the indoor heat exchanger (7), and the indoor unit (10) is controlled by controlling the number of operating outdoor units (1). In the heat pump type refrigeration apparatus which adjusts the capacity of the outdoor unit, an unsteady operation detecting means (19) for detecting an unsteady operation of the outdoor unit (1) is provided for each of the outdoor units (1), and the number of units is controlled. At the time of low-capacity operation, when the detection means (19) outputs, the stopped outdoor unit (1) is operated, and the backup means (20) for backing up the outdoor unit (1) in the unsteady operation is provided. Requested as required
Outdoor units that increase or decrease based on the number of operating outdoor units (1)
(1) a fixed rotation rate for each change in the required number of units
Rotation control means (18) set by the
Rotation set by the rotation control means (18)
Backup selecting means (21) for selecting an outdoor unit (1) to be backed up based on an application and outputting an operation command
And a heat pump type refrigeration apparatus characterized by comprising: 2. A plurality of indoor heat exchangers (7) corresponding to a plurality of outdoor units (1), and each of these indoor heat exchangers (7) is provided.
An independent refrigerant circulation system is provided between the outdoor heat exchanger (3) and each of the outdoor units (1), and the defrost operation of the outdoor heat exchanger (3) is enabled for each of the refrigerant circulation systems. As the operation, the unsteady operation detecting means (1)
2. The heat pump refrigeration apparatus according to claim 1, wherein the temperature is detected in 9). 3. A plurality of indoor heat exchangers (7) corresponding to a plurality of outdoor units (1), and each of these indoor heat exchangers (7).
An independent refrigerant circulation system is provided between the indoor heat exchanger (7) and each of the outdoor units (1), and the operation of the outdoor unit (1) is stopped for each of these refrigerant circulation systems. )
The heat pump type refrigerating apparatus according to claim 1, wherein the freezing prevention can be prevented, and the antifreezing operation is detected as an unsteady operation by the unsteady operation detecting means (19).