JPH08327125A - Freezer, and conditioner using it, and operation method of air conditioner - Google Patents

Abstract

PURPOSE: To provide a freezer not badly influencing surroundings and being capable of preventing hunting, and an operation method of an air conditioner using the freezer, and further the air conditioner having a simplified construction and being capable of reduction of the number of parts. CONSTITUTION: In a freezer including a compressor, the compressor 111 is a pole number conversion type, and a refrigerant return mechanism 15 is provided for returning part of a refrigerant discharged from the pole number conversion type compressor to a suction side of the compressor. The refrigerant return mechanism 15 and a pole number conversion mechanism 111a of the pole number conversion type compressor 111 are controlled to make compression capability variable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating device for circulating a refrigerant in a refrigerant circuit such as an air conditioner or a refrigerator, an air conditioner using the refrigerating device, and a method for operating the air conditioner.

[0002]

2. Description of the Prior Art As shown in FIG.
1, an oil separator 82, a four-way valve 83, a condenser 84,
A refrigerating device and an air conditioner in which a refrigerant circuit is configured by sequentially connecting a pressure reducer 85, a receiver tank 86, a pressure reducer 92, and an evaporator 87 are known. 84a is a blower for condensers. In this type, when the load of air conditioning changes,
The capacity of the compressor is changed according to the fluctuation of the load. A generally known means for varying the capacity of the compressor is a so-called inverter compressor 91 that changes the driving power frequency to change the capacity.

[0003]

However, in the above-mentioned conventional technique, the use of the inverter compressor 91 causes a problem that the product cost increases. Further, when the inverter compressor 91 is used, higher harmonics appear with the operation of the inverter, so noise is given to peripheral devices (for example, a computer) and capacitors (electric parts) are used.
There are problems such as puncturing. On the contrary,
Using a refrigerant return mechanism that returns a portion of the refrigerant discharged from the rated compressor to the suction side without using an inverter compressor, it is conceivable to perform multi-step control with the rated compressor.
In this case, smooth control cannot be performed, which causes hunting, and there is a problem that the control range is limited to an extremely narrow range. When hunting occurs in this way, the room temperature fluctuates greatly, and there is a problem that a comfortable air-conditioning state cannot be obtained.

Therefore, an object of the present invention is to eliminate the problems of the above-mentioned conventional technique, to prevent the hunting from occurring, without adversely affecting the equipment arranged around the device, and A method of operating an air conditioner using the refrigeration system is provided, and the configuration is simple,
It is to provide an air conditioner capable of reducing the number of parts.

[0005]

According to a first aspect of the present invention, in a refrigerating apparatus including a compressor, the compressor is a pole-changing compressor, and the compressor is discharged from the pole-changing compressor. A refrigerant return mechanism for returning a part of the refrigerant to the refrigerant suction side of the pole-changing compressor is provided, and the compression capacity is controlled by controlling this refrigerant returning mechanism and the pole-changing mechanism of the pole-changing compressor. It is characterized by being variable.

According to a second aspect of the present invention, in a refrigerating apparatus including a compressor, the compressor is a pole number conversion type compressor, and the pole number conversion type compressor is in the middle of compression in a container of the compressor. A power saving mechanism for returning a part of the refrigerant to the container of the compressor, and controlling the power saving mechanism and the pole changing mechanism of the pole changing type compressor to change the compression capacity. To do.

According to a third aspect of the present invention, in a refrigerating apparatus including a compressor, the compressor is a pole number conversion type compressor, and the pole number conversion type compressor is in the middle of compression in a container of the compressor. A power saving mechanism for returning a part of the refrigerant to the container of the compressor is provided, and a refrigerant returning mechanism for returning a part of the refrigerant discharged from the pole number conversion type compressor to the refrigerant suction side of the compressor is provided. It is characterized in that the compression capacity is varied by controlling the refrigerant return mechanism, the power save mechanism, and the pole number conversion mechanism of the pole number conversion type compressor.

The invention according to claim 4 is the invention according to claim 1 or 3.
The refrigeration apparatus according to claim 1, wherein the refrigeration apparatus includes a plurality of compressors, and at least one of the plurality of compressors includes the power save mechanism.

The invention according to claim 5 is provided with a plurality of indoor units having an indoor heat exchanger, an outdoor unit having an outdoor heat exchanger and a compressor, and the refrigeration according to any one of claims 1 to 3. It is characterized by further comprising a device.

According to a sixth aspect of the present invention, in the fifth aspect, the indoor unit is provided with a control valve for controlling the amount of refrigerant flowing into the indoor heat exchanger, and the indoor unit has an air conditioning load. Accordingly, the control device is provided with a control device that controls the opening degree of the control valve to perform cooling / heating operation corresponding to the air conditioning load.

According to a seventh aspect of the present invention, there is provided an indoor unit having a plurality of indoor heat exchangers, an outdoor heat exchanger and an outdoor unit having a compressor, and the refrigerant return mechanism and the pole number conversion type compressor. A method of operating an air conditioner, comprising: the refrigeration apparatus according to claim 1, further comprising: a control valve for controlling an inflow amount of a refrigerant in an indoor heat exchanger, the valve of the control valve according to an air conditioning load. When the cooling / heating operation corresponding to the air conditioning load is controlled by controlling the opening degree and the control of the control valve cannot cope with the fluctuation of the air conditioning load, the number of poles of the refrigerant return mechanism and the number of poles conversion type compressor is converted. It is characterized in that the compression capacity is changed by controlling the mechanism.

[0012]

According to the invention described in claim 1, in addition to changing the number of poles of the pole number conversion type compressor, a part of the refrigerant discharged from the compressor is returned to the suction side of the compressor by the refrigerant returning mechanism. Variable refrigeration capacity. By using this refrigeration system, an inverter (frequency converter) such as a conventional inverter compressor is not needed, and if the circulation amount in the refrigeration system is adjusted by the control valve in the indoor unit, the outdoor unit Does not require a control valve for controlling the circulation amount of such a refrigerant. For this reason, a liquid receiver (receiver) and a control valve described above, which have been conventionally used, are not required in the outdoor unit, so that the configuration is simplified and the number of parts can be reduced.

According to the second aspect of the present invention, in addition to changing the number of poles of the pole number conversion type compressor, a part of the refrigerant in the middle of compression in the container of the compressor is partially changed by the power save mechanism. Refrigerating capacity is made variable by returning to the container.

According to the third aspect of the present invention, the number of poles of the pole number conversion type compressor is changed, and a part of the refrigerant in the middle of compression in the compressor vessel is transferred to the vessel of the compressor by the power saving mechanism. The refrigerating capacity is made variable by returning or returning a part of the refrigerant discharged from the compressor to the suction side of the compressor by the refrigerant returning mechanism.

According to the invention described in claim 4, since the refrigerating device is provided with a plurality of compressors, and at least one compressor is provided with a power saving mechanism,
In addition to the invention described in (1), a wider range and finer control can be performed by combining the respective compressors.

According to the invention described in claim 5, since the so-called multi-type air conditioner is provided with the refrigerating device according to claim 1, fine control can be performed in a wide range in the indoor unit, so that comfortable air conditioning is possible. Can be obtained. Furthermore, since the amount of refrigerant supplied to the indoor unit can be controlled by the capacity of the compressor and the control valve in the indoor unit, other devices for controlling the amount of refrigerant in the outdoor unit,
For example, a receiver tank is not required, the configuration is simplified, and the number of parts can be reduced.

According to the sixth aspect of the present invention, the indoor unit is provided with the control valve for controlling the amount of the refrigerant flowing into the indoor heat exchanger. Therefore, the opening degree of the control valve is adjusted according to the air conditioning load of the indoor unit. It is possible to control and perform cooling / heating operation corresponding to the air conditioning load. Therefore, the structure is simplified and the number of parts is reduced.

According to the invention described in claim 7, the amount of the refrigerant supplied to the indoor unit changes the number of poles of the pole number conversion type compressor, and the refrigerant return mechanism of the compressor and the valve opening control of the control valve. Therefore, the receiver tank and the opening / closing valve on the side of the outdoor unit, which are conventionally required, are not required even if the amount of the refrigerant to be pumped changes in accordance with the load change. Therefore, the structure is simplified and the number of parts is reduced. Further, since the control valve of the indoor unit adjusts the amount of refrigerant flowing into the indoor heat exchanger, this refrigeration system can be operated according to the load, and more stable and comfortable air conditioning can be performed.

[0019]

Embodiments of the present invention will be described below with reference to FIGS. In FIG. 1, 1 is a separation type air conditioner, and this air conditioner 1 includes a plurality of indoor units A.
1, A2 and outdoor unit B and both units A1, A2, B
It is constituted by the unit-to-unit piping 2 connecting between the units. Each of the indoor units A1 and A2 incorporates an indoor heat exchanger 3 that functions as an evaporator during cooling operation and a condenser during heating operation, and an indoor fan (not shown).

Each of the indoor units A1 and A2 has a temperature detector T1 at the inlet side of the indoor heat exchanger 3 and a temperature detector T1 at the outlet side thereof.
T2 is provided, and each detection signal is sent to the control device 5a to measure the load on each indoor heat exchanger 3. The indoor heat exchanger 3 is provided with a control valve (mechanical valve) 17 in each of the indoor units A1 and A2. This control valve 17 is provided for each indoor unit A1, A
In addition to shutting down when the operation of 2 is stopped and stopping the inflow of refrigerant,
The opening of the valve is adjusted to control the refrigerant inflow amount according to the load.

That is, according to this embodiment, the control valve 1
Since the amount of refrigerant flowing into the indoor heat exchanger 3 is controlled by 7, it is possible to temporarily perform control according to the load of the air conditioning regardless of the load state of the outdoor unit B.

The outdoor unit B includes a compressor (described later).
A refrigerant control device 5 configured by, for example, is provided, and the refrigerant control device 5 controls the capacity of the compressor and the like in response to the control signal of the control device 5a. The outdoor unit B further includes a four-way valve 6, an outdoor heat exchanger 7 that functions as a condenser during cooling operation and an evaporator during heating operation, and an accumulator 8.

Further, in this embodiment, tubes having a small diameter are used for the indoor heat exchanger 3 and the outdoor heat exchanger 7. For example, a tube with a diameter of about 7 mm, which is smaller than a normal one (a diameter of about 9 mm), is used, which is inexpensive and has a small capacity. By using such a pipe having a small diameter, it is possible to reduce the capacity of the refrigerant circuit on the side of the indoor units A1 and A2, and to reduce the amount of refrigerant to be sealed. Further, in the entire refrigerant circuit of the air conditioner 1, the so-called decompressor is only the control valve 17 provided in the indoor units A1 and A2, and the decompressor 85 and the receiver tank (see FIG. 13) conventionally required are Not placed.

The refrigerant control device 5 includes two compressors 11,
12 are provided, the accumulator 8 is connected to the suction side, and the oil separator 9 is connected to the discharge side. In this embodiment, one compressor 11 has 4 horsepower and the other compressor 12 has 6 horsepower. The two compressors 11 and 12 are so-called rated compressors having a constant drive power frequency, but one of the compressors (the compressor with the smaller horsepower) 11 has a power save mechanism 13 which will be described later. The power save mechanism 13 saves the output of the compressor 11 and changes the discharge amount. Further, the refrigerant control device 5
Is provided with a refrigerant return mechanism 15 for returning a part of the refrigerant discharged from the discharge pipes of both compressors 11 and 12 to the suction pipe 45 on the refrigerant suction side of the compressors 11 and 12.

As shown in FIGS. 2 and 3, in the power save mechanism 13, a rotary compression element is housed in a closed container 18 of the compressor 11, and the rotary compression element is an intermediate partition plate 27.
And a pair of cylinders 21 and 22 provided on both sides of the intermediate partition plate 27, respectively. Double cylinder 2
The first holes 23 and 24 provided on the inner side walls of the first and second cylinders 22 and the both cylinders 21 and 24 so as to communicate with the first holes 23 and 24.
Second holes 25 and 26 provided in the second hole 22 and the second hole 2
A third hole 28 is formed in the intermediate partition wall 27 that communicates 5 and 26. In addition, both cylinders 21 and 22
Pistons 29 and 30 are housed in the second holes 25 and 26 of the coil spring, and a coil spring (a leaf spring or a bellows may be used as long as it is an elastic body) 32 is disposed across the pistons 29 and 30. There is. Recess 3 formed in cylinders 21 and 22
The second holes 25, 2 of each of the cylinders 21, 22
6 and the fourth holes 33, 34, which communicate with 6, and the fourth holes 33, 3
A passage 35 is formed which selectively communicates 4 with the low pressure side or the high pressure side of the external refrigerant circuit with a switching valve or the like.

The power saving mechanism 1 having the above-mentioned structure
3 is controlled by the passage 35, the fourth holes 33, 34, the recess 3
By applying a low-pressure side pressure as a back pressure to the second holes 25, 26 via 1, the pistons 29, 30 are moved to the top dead center, and the first holes 23, 24 are opened as shown in FIG. As a result, the gas in the compression process in one of the cylinders 21 is supplied to the first hole 23, the second hole 25, the third hole 28, and the second hole 2.
6, while flowing through the first hole 24 into the other cylinder 22 in the suction process, during normal operation, through the passage 35, the fourth hole 35, 34, the recess 31 as shown in FIG. Then, by applying a high pressure side pressure to the second holes 25, 26 as a back pressure chamber, the pistons 29, 30 are moved to the bottom dead center, and both the first holes 23, 24 are closed, so that both cylinders 21, The movement of gas between 22 is eliminated.

According to the power saving mechanism 13 of this embodiment, the output of about 50% can be saved, and the output of 2 horsepower can be saved for the compressor of 4 horsepower. The power save mechanism 13 is turned on and off by receiving a command from the control device 5a and opening and closing the valve 41 (see FIG. 1).

The refrigerant return mechanism 15 is used for both rated compressors 1.
A part of the discharge refrigerant is returned from the discharge side pipes 1 and 12 to the suction side pipes of both compressors 11 and 12. In this embodiment, the discharge pipe 43 between the oil separator 9 and the four-way valve 6 is provided.
And a suction pipe 45 between the accumulator 8 and the four-way valve 6.
A return pipe 47 communicating with and is provided, and a return valve 49 provided in the return pipe 47 is opened and closed to return a part of the discharged refrigerant to the accumulator 8. still,
In the refrigerant return mechanism 15 of this embodiment, the output of 1 horsepower is saved. The return valve 49 is opened / closed in response to a control signal from the control device 5a, and the indoor unit A1,
The amount of refrigerant supplied to A2 (pressure output) is controlled.

Next, the operation of this embodiment will be described.

In the refrigerant circuit of the air conditioner shown in FIG. 1, when the four-way valve 6 is switched to change the flow of refrigerant, cooling operation or heating operation is performed. In FIG. 1, the refrigerant flow during cooling is indicated by a solid line, and the refrigerant flow during heating is indicated by a broken line.

By the way, during operation, the temperature sensors T1 and T2 of each indoor unit respectively detect the refrigerant inlet and outlet temperatures of the indoor heat exchanger 3, and the detected signals are sent to the control device 5.
Send to a. The control device 5a calculates the air conditioning load required for each indoor heat exchanger 3 based on, for example, the set temperature signal from the remote controller 52 and the temperature signals of the temperature sensors T1 and T2. Indoor units A1 and A
The opening degree of the second control valve 17 or the refrigerant control device 5
The refrigerant is controlled by controlling the capacity from.

Next, this refrigerant control method will be described. As shown in FIG. 5, in the control device 5a, first, the opening degree of the control valve (mechanical valve) 17 is controlled based on the load detected in step S1. Next, in step S2, it is determined whether the load is within a certain range. In other words, the difference | T0-T3 | between the room temperature T0 and the set temperature (temperature set by the user with the remote controller 52) T3 is the predetermined value F.
Is less than or equal to. When | T0-T3 | is smaller than the predetermined value F, the process returns to step S1 and | T
If 0-T3 | is larger than the predetermined value F, step S
Proceeding to 3, the capacity control by the refrigerant control device 5 is performed.

That is, in the present embodiment, first, the valve opening of the control valve 17 is controlled, and when the control of the control valve 17 alone cannot control the air conditioning (refrigeration) capacity, the refrigerant control device 5 compresses the air. Performs machine capacity control.

The control method by the control valve 17 will be described in more detail with reference to FIG. In step S11, first, the initial load | T0 required for the indoor heat exchanger 3 is detected by detecting the temperature according to the room temperature T0 and the set temperature T3.
-T3 | is detected and the process proceeds to step S12. Step S
In 12, the valve opening degree of the control valve 17 is set in response to the initial load detected in step S11, and the process proceeds to step S13. In step S13, calculation is performed based on the inlet and outlet temperatures T1 and T2 of the heat exchanger 3, and | T1−T2 | = Δ
When T is detected, the process proceeds to step S14. In step S14, it is determined whether or not ΔT is equal to the predetermined value K. If equal, the process returns to step S13, and if not equal, the process proceeds to step S15. In step S15, it is determined whether or not ΔT is larger than a predetermined value K, and if it is larger, the process proceeds to step S16, and the control valve 17 is opened, and then step S1.
Proceeding to step 7, the refrigerant control device 5 controls the capacity of the compressor. After performing the capacity control of the compressor, the process returns to step S13. On the other hand, when ΔT is not larger than the predetermined value K, the process proceeds to step S18, the control valve 17 is closed by a predetermined amount to control the opening degree to be small, and then the step S18 is performed.
Return to 13.

In this way, the valve opening of the control valve 17 is controlled, and the air-conditioning (refrigeration) is performed only by controlling the control valve 17.
When the capacity cannot be controlled, the refrigerant controller 5 controls the capacity of the compressor as follows.

The compressor capacity control performed in step S17 will be described. In the refrigerant control device 5, the power saving mechanism 13 and the refrigerant returning mechanism 15 described above variously control the pressure-feeding output of the refrigerant for each horsepower, as shown in FIG.
That is, the outputs of the two rated compressors 11 and 12 are 4 horsepower and 6
Since it is horsepower, a discharge output of 10 horsepower can be obtained in a state where the valve 41 and the return valve 49 of the power save mechanism 13 are turned off (a state where two valves are closed). When the required output (horsepower) is 10 horsepower, the two rated compressors 11, 1
Turn on only the respective magnet switches of 2.
The inside of the rated compressor 11 is in the state shown in FIG.

When the required horsepower is 9 horsepower, the magnet switches of the two rated compressors 11 and 12 are turned on.
The valve is set to N and the return valve 49 is opened (ON). In this case, the discharge amount for one horsepower is returned from the return pipe 47 to the accumulator 8.

When the required horsepower is 8 horsepower, the magnet switches of the two rated compressors 11 and 12 are turned on.
N, and the return valve 49 remains closed (-),
The valve 41 of the power save mechanism 13 is opened (ON). In this case, as shown in FIG. 2, due to the action of the power saving mechanism 13, the output discharged from one compressor 11 becomes 2 horsepower (the output of 4 horsepower becomes half), and the other compressor 1
The output of 2 is 6 horsepower, so a total of 8 horsepower.

When the required horsepower is 7 horsepower, the magnet switches of the two rated compressors 11 and 12 are turned on.
While setting to N, the return valve 49 is opened (ON) and the valve 41 of the power save mechanism 13 is opened (ON). In this case, due to the action of the power save mechanism 13, the output discharged from one of the compressors 11 becomes 2 horsepower (the output of 4 horsepower becomes half) (see FIG. 2), and the return pipe 47 outputs 1
A total of 7 horsepower is obtained because the horsepower of the refrigerant is returned.

Similarly, as shown in the table of FIG. 4, by combining the opening and closing (ON or −) of the valve 41 of the power saving mechanism 13 and the return valve 49, fine horsepower of 1 to 10 horsepower is obtained. It becomes possible to control.

Thus, step S17 according to this embodiment is performed.
The compressor capacity control is a stepwise control from 1 to 10 horsepower by 1 horsepower. Therefore, according to the present embodiment, since the control by the control valve 17 is added, as shown by the alternate long and short dash line in the graph of FIG. 4, a smooth control almost equivalent to the control using the inverter compressor is performed. Will be possible. By controlling in this way, the required smooth variable output can be obtained only by the rated compressor without using the inverter compressor. Therefore, it is possible to prevent an adverse effect such as noise due to the inverter compressor, and to provide an inexpensive device.

Further, in this embodiment, the pipe diameter of the indoor heat exchanger is 7 mm, which is set smaller than the pipe diameter 9 mm of the outdoor heat exchanger. The control valve 17 acting as a decompressor of the refrigerant is arranged only in the indoor units A1 and A2 so that the refrigerant flowing in the inter-unit pipe is in a liquid state during both cooling and heating operations. With these two configurations, the amount of the refrigerant filled in the refrigerant circuit can be minimized, so that the receiver tank and the on-off valve 92 (see FIG. 13) are not required, and the number of parts can be reduced. can get.

FIG. 7 shows another embodiment. The difference from the embodiment of FIG. 1 is that one of the two compressors 111
Is not a rated compressor, but a pole conversion type compressor. The pole number conversion type compressor 111 has a pole number conversion mechanism 111a for converting the number of poles of the compressor motor, and the number of poles of the compressor motor is set to 2 by this pole number conversion mechanism 111a.
Switching from 4 poles to 4 poles halves the rotation speed of the compressor, while switching from 4 poles to 2 poles doubles the rotation speed of the compressor.

According to this embodiment, according to the air conditioning load,
First, the opening degree of the control valve 17 is controlled. Specifically, when the air conditioning load increases, the opening degree of each control valve 17 of the indoor units A1, A2 is opened, and conversely, when the air conditioning load decreases, the opening degree of each control valve 17 is closed. When the increase or decrease in the air conditioning load cannot be dealt with by merely controlling the opening degree of the control valve 17, as shown in step 103 of FIG. 8 and step 117 of FIG. 9, the compressor is controlled by the pole number conversion mechanism 111a. By switching the number of poles of the motor to increase or decrease the discharge amount of the compressor 111, or by referring to FIG.
A part of the discharge amount from 7 is returned to the accumulator 8. The control device 5a controls the control during this period.

According to this, referring to FIG. 10 corresponding to FIG. 4, stepwise control is performed by 1 horsepower from 1 to 10 horsepower, and control by the control valve 17 is added, so that the graph of FIG. As indicated by the alternate long and short dash line, smooth control almost equivalent to control using an inverter compressor becomes possible.

FIG. 11 shows still another embodiment. Referring to FIG. 11, one of the two compressors, the compressor 211
Is a 50% power save mechanism 13 as in the embodiment of FIG.
The compressor 211 is provided with a pole number converting mechanism 211a.

In this case, when the full power (during 2-pole operation) is set to 4 horsepower as shown in FIG. 12, the compressor 211 becomes 2 horsepower during the 50% power save operation, and during 4-pole operation. It becomes 2 horsepower at full power, and becomes 1 horsepower during 50% power save operation. Moreover, by opening the return valve 49 during each of these operations, it is possible to set a capacity that is one horsepower less than the above horsepower. By combining these controls with the compressor 12 on one side, it is possible to set the capacity in increments of 1 horsepower by the compressor. By controlling the capacity setting and the opening of the control valve 17, smooth control that is almost the same as the control using the inverter compressor becomes possible. Needless to say, also in this embodiment, the valve opening of the control valve 17 is always controlled at the initial stage of the control.

[0048]

As is apparent from the above description, according to the first aspect of the present invention, the number of poles of the pole number conversion type compressor is changed and one of the refrigerant discharged from the compressor by the refrigerant return mechanism is changed. By returning the part to the suction side of the compressor, the refrigerating capacity can be made variable. By using this refrigeration system, an inverter (frequency converter) such as a conventional inverter compressor is not needed, and if the circulation amount in the refrigeration system is adjusted by the control valve in the indoor unit, the outdoor unit Does not require a control valve for controlling the circulation amount of such a refrigerant. For this reason, a liquid receiver (receiver) and a control valve described above, which have been conventionally used, are not required in the outdoor unit, so that the configuration is simplified and the number of parts can be reduced.

According to the second aspect of the invention, in addition to changing the number of poles of the pole number conversion type compressor, a part of the refrigerant in the middle of compression in the container of the compressor is changed by the power saving mechanism. The refrigerating capacity can be made variable by returning to the container.

According to the invention described in claim 3, in addition to changing the number of poles of the pole number conversion type compressor, a part of the refrigerant in the middle of compression in the compressor vessel is transferred to the vessel of this compressor by the power saving mechanism. The refrigeration capacity can be made variable by returning or returning a part of the refrigerant discharged from the compressor to the suction side of the compressor by the refrigerant returning mechanism.

According to the invention described in claim 4, since a plurality of rated compressors are provided and at least one compressor is provided with the power saving mechanism, in addition to the invention described in claim 1, By combining each compressor, a wider range and finer control can be performed.

According to the fifth aspect of the present invention, the so-called multi-type air conditioner is provided with the refrigerating apparatus according to the first aspect, so that the indoor unit can perform a fine control over a wide range, so that comfortable air conditioning is possible. Can be obtained. Further, since the amount of refrigerant supplied to the indoor unit can be controlled by the capacity of the compressor or the control valve in the indoor unit, other devices for controlling the amount of refrigerant in the outdoor unit, such as a receiver tank, are unnecessary, Can be simplified, and the number of parts can be reduced.

According to the invention described in claim 6, in the so-called heat pump type multi-type air conditioner, the amount of the refrigerant supplied to the indoor unit is controlled by the control valve provided in the indoor unit. It is possible to perform air conditioning according to the load without the required receiver tank and the opening / closing valve of the outdoor heat exchanger.

According to the invention described in claim 7, in addition to changing the number of poles of the pole-changing compressor, the amount of refrigerant supplied to the indoor unit is controlled by the refrigerant return mechanism of the compressor and the valve opening control of the control valve. Therefore, the receiver tank and the opening / closing valve on the side of the outdoor unit, which are conventionally required, are not required even if the amount of the refrigerant to be pumped changes in accordance with the load change. Therefore, the structure is simplified and the number of parts is reduced. Further, since the amount of refrigerant flowing into the indoor heat exchanger is adjusted by the control valve of the indoor unit, it is possible to operate according to the load, and more stable and comfortable air conditioning can be performed.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a power saving mechanism built in the compressor.

FIG. 3 is a cross-sectional view explaining the operation of the power save mechanism shown in FIG.

FIG. 4 is a diagram showing a relationship between a change in operating horsepower and an action of a compressor in the refrigerant control device.

FIG. 5 is a flowchart showing a schematic control of the air conditioner according to the present embodiment.

FIG. 6 is a flowchart showing the control content shown in FIG. 5 in more detail.

FIG. 7 is a circuit diagram of an air conditioner according to another embodiment.

8 is a view corresponding to FIG. 5 of the air conditioner of FIG. 7.

9 is a view corresponding to FIG. 6 of the air conditioner of FIG. 7.

10 is a view corresponding to FIG. 4 of the air conditioner of FIG. 7.

FIG. 11 is a circuit diagram of an air conditioner according to yet another embodiment.

FIG. 12 is a control diagram of the compressor shown in FIG. 11.

FIG. 13 is a circuit diagram of a conventional air conditioner.

[Explanation of symbols]

 1 Air Conditioner 2 Piping between Units 3 Indoor Heat Exchanger 5 Refrigerant Control Device 11, 12 Compressor 13 Power Save Mechanism 15 Refrigerant Return Mechanism 17 Open / Close Valve

Claims (7)

[Claims] 1. A refrigeration apparatus having a compressor, wherein the compressor is a pole-changing compressor, and a part of the refrigerant discharged from the pole-changing compressor is used as a pole-changing compressor. A refrigerating apparatus comprising a refrigerant return mechanism for returning to the refrigerant suction side, and varying the compression capacity by controlling the refrigerant return mechanism and the pole number conversion mechanism of the pole number conversion type compressor. 2. A refrigeration apparatus equipped with a compressor, wherein the compressor is a pole-changing compressor, and the pole-changing compressor compresses a part of a refrigerant in the middle of compression in a container of the compressor. A refrigerating apparatus comprising a power saving mechanism for returning to a container of a compressor, and varying a compression capacity by controlling the power saving mechanism and the pole changing mechanism of a pole changing type compressor. 3. A refrigeration apparatus equipped with a compressor, wherein the compressor is a pole number conversion type compressor, and the pole number conversion type compressor is provided with a part of a refrigerant in the middle of compression in a container of the compressor. A power saving mechanism for returning to the container of the compressor is provided, and further, a refrigerant returning mechanism for returning a part of the refrigerant discharged from the pole number conversion type compressor to the refrigerant suction side of the compressor is provided. A refrigeration apparatus characterized in that a compression capacity is varied by controlling a save mechanism and a pole number conversion mechanism of the pole number conversion type compressor. 4. The refrigerating apparatus has a plurality of compressors, and at least one of the plurality of compressors has the power saving mechanism. Refrigeration equipment. 5. A refrigeration apparatus according to claim 1, further comprising a plurality of indoor units having an indoor heat exchanger, an outdoor unit having an outdoor heat exchanger, and an outdoor unit having a compressor. And an air conditioner. 6. The indoor unit is provided with a control valve for controlling the amount of refrigerant flowing into the indoor heat exchanger, and the opening of the control valve is controlled according to the air conditioning load of the indoor unit to control the air conditioning load. The air conditioner according to claim 5, further comprising a control device that performs a cooling / heating operation in proportion to each other. 7. The apparatus according to claim 1, comprising a plurality of indoor units having an indoor heat exchanger, an outdoor heat exchanger and an outdoor unit having a compressor, and having the refrigerant return mechanism and the pole number conversion type compressor. In an operating method of an air conditioner, which comprises the refrigeration apparatus described above, and the indoor heat exchanger includes a control valve for controlling the inflow amount of the refrigerant, the valve opening degree of the control valve is controlled according to an air conditioning load, When the cooling / heating operation corresponding to the air conditioning load is performed and the control of the control valve cannot cope with the fluctuation of the air conditioning load, the refrigerant return mechanism and the pole number conversion mechanism of the pole number conversion type compressor are controlled. A method for operating an air conditioner, which is characterized by varying a compression capacity.