JP3407632B2 - Heating start control device for refrigerant-heated air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant heating type refrigeration cycle capable of heating operation, an inverter driving section for driving a variable frequency compressor at the time of starting heating operation, and a ratio of an output frequency and an output voltage of the inverter driving section. F / V
The present invention relates to a heating operation control device for a refrigerant heating type air conditioner provided with a storage section for storing a plurality of characteristics.

[0002]

2. Description of the Related Art In a heating starter for a refrigerant heating type air conditioner, when a heating operation start signal is received, an inverter drive section starts a variable frequency compressor using the F / V characteristic used during a cooling operation, and Raise to the recovery frequency,
Refrigerant is collected to collect the refrigerant accumulated in the outdoor heat exchanger into a refrigerant heating type refrigeration cycle capable of heating operation.

When the variable frequency compressor is operated at the refrigerant recovery frequency until the temperature of the heater rises after the refrigerant recovery is completed, the liquid refrigerant returns to the variable frequency compressor, and the variable frequency compressor operates as a liquid. In order to cause compression, it is necessary to lower the operating frequency of the variable frequency compressor to a low frequency.

In the prior art, the maximum operating frequency of the variable frequency compressor during the heating operation was lower than the refrigerant recovery frequency during the refrigerant recovery performed at the start of the heating operation, so that the F / F used during the cooling operation is used. With the V characteristic, the inverter drive unit drives the variable frequency compressor to collect the refrigerant,
After the completion of refrigerant recovery, the F / V used during heating operation is reduced to the maximum operating frequency of the variable frequency compressor during heating operation.
I was able to move on to the property.

Therefore, the F / V characteristic in which the inverter drive section drives the variable frequency compressor during the heating operation and the F / V characteristic in which the inverter drive section drives the variable frequency compressor during the cooling operation.
It would have been good if there was a storage unit for storing the / V characteristic.

[0006]

Generally, in order to increase the heating operation capacity of a refrigerant heating type air conditioner, in order to increase the amount of refrigerant circulation in a refrigerating cycle capable of heating,
It is necessary to increase the maximum frequency of the variable frequency compressor during heating operation.

In the above-mentioned conventional technique, the maximum operating frequency of the variable frequency compressor driven by the F / V characteristic used during heating operation is higher than that of the variable frequency compressor driven by the F / V characteristic used during cooling operation. The frequency was lower than the frequency for refrigerant recovery.

Therefore, when the heating operation start signal is received, the variable frequency compressor is raised to the refrigerant recovery frequency with the F / V characteristic used during the cooling operation, and when the refrigerant recovery is completed, the F operation used during the cooling operation is performed. It was sufficient to lower the operating frequency of the variable frequency compressor when shifting from the / V characteristic to the F / V characteristic used during the heating operation.

However, when the refrigerant circulation amount is increased during heating operation of the refrigerant heating type air conditioner to increase the heating operation capacity, the maximum operating frequency of the variable frequency compressor driven by the F / V characteristic during heating operation is increased. The frequency may be higher than the refrigerant recovery frequency of the variable frequency compressor driven by the F / V characteristic during the cooling operation.

At that time, since there are only F / V characteristics in which the inverter drive unit drives the variable frequency compressor during the cooling operation and only F / V characteristics in which the inverter drive unit drives the variable frequency compressor during the heating operation, the heating operation is performed. When the start signal is received, the variable frequency compressor is started with the F / V characteristic during the cooling operation, the refrigerant recovery frequency is increased, and the refrigerant is recovered.
After the completion of the refrigerant recovery, in order to shift to the F / V characteristic used during the heating operation, the frequency of the variable frequency compressor is further increased.

As a result, liquid refrigerant may return to the variable frequency compressor, causing liquid compression in the variable frequency compressor. Therefore, it is attempted to increase the refrigerant circulation amount to improve the heating operation capacity of the refrigerant heating type air conditioner. However, there is a problem that the maximum operating frequency of the variable frequency compressor driven by the F / V characteristic during the heating operation is limited.

The present invention is to solve the above-mentioned problems, and makes it possible to operate the variable frequency compressor at a high frequency during the heating operation of the refrigerant heating type air conditioner, and to perform the control for ensuring the reliability of the variable frequency compressor. The purpose is to provide.

[0013]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a refrigerant recovery method for recovering a refrigerant from an outdoor heat exchanger to a refrigerant heating type refrigeration cycle capable of heating operation at the time of cooling operation and heating operation start. The first F / V characteristic in which the inverter drive unit drives the variable frequency compressor, and the second F / V characteristic in which the inverter drive unit drives the variable frequency compressor during the heating operation.
A memory that stores a V characteristic and a third F / V characteristic that an inverter drive unit drives a variable frequency compressor when the first F / V characteristic shifts to the second F / V characteristic when the refrigerant is recovered. Parts are provided.

By providing the above storage unit, the variable frequency compressor can be operated at a high frequency during the heating operation of the refrigerant heating type air conditioner.

[0015]

1 is a block diagram showing a configuration of an inverter driving unit according to a first embodiment of the present invention. First to drive variable frequency compressor
F / V characteristic, a second F / V characteristic in which the inverter drive unit drives the variable frequency compressor during the heating operation, and a predetermined cooling operation frequency of the first F / V characteristic after the refrigerant is recovered from the predetermined cooling operation frequency. A third step in which the inverter drive section drives the variable frequency compressor at the time of shifting to the predetermined heating operation frequency of the F / V characteristic of 2.
The variable frequency compressor can be operated at a high frequency during the heating operation of the refrigerant heating type air conditioner by providing the storage unit for storing the F / V characteristic of the above.

According to a second aspect of the present invention, the variable frequency compressor is used by the inverter drive unit at the time of refrigerant recovery for recovering the refrigerant from the outdoor heat exchanger to the refrigerant heating type refrigeration cycle capable of heating operation during the cooling operation and the start of the heating operation. First F / V driving the
Characteristics, a second F / V characteristic in which the inverter drive unit drives the variable frequency compressor during the heating operation, and the second F / V characteristic from the refrigerant recovery frequency of the first F / V characteristic after refrigerant recovery.
The input voltage after the refrigerant recovery is lowered by providing the storage unit for storing the third F / V characteristic in which the inverter driving unit drives the variable frequency compressor when the temperature changes to the predetermined heating operation frequency of the / V characteristic. It makes it possible.

According to a third aspect of the present invention, the variable frequency compressor is used by the inverter drive unit during the refrigerant recovery for recovering the refrigerant from the outdoor heat exchanger to the refrigerant heating type refrigeration cycle capable of the heating operation during the cooling operation and the heating operation start. First F / V driving the
Characteristics, a second F / V characteristic in which the inverter drive unit drives the variable frequency compressor during the heating operation, and the first F / V characteristic after the refrigerant recovery.
From the predetermined refrigerant operating frequency of the F / V characteristic of the second F / V
The input voltage is lowered by providing a storage unit for storing the third F / V characteristic in which the inverter drive unit drives the variable frequency compressor when the heating operation frequency is the same as the predetermined cooling operation frequency of the characteristic. Therefore, the first during cooling operation
It is possible to shift from the F / V characteristics of the above to the F / V characteristics of the heating operation.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a refrigerant heating type air conditioner controlled by the present invention. In the figure, 1 is an indoor unit, 2
Is an outdoor unit, and a variable frequency compressor 3, an indoor heat exchanger 4, a two-way valve 5, and a heater 6 are connected in a ring shape to enable heating operation, and a variable frequency compressor 3 and outdoor heat. It is configured by a refrigeration cycle in which the exchanger 7, the pressure reducer 8, the check valve 9, and the indoor heat exchanger 4 are connected in an annular shape and which is capable of cooling operation.

Further, 10 is a four-way valve, which is turned on during the cooling operation and turned off during the cooling operation. The two-way valve 5 is turned on during the heating operation and is turned on during the cooling operation.
FF is done.

FIG. 2 shows the configuration of the drive unit of the variable frequency compressor 3 according to the present invention. In the figure, 11 is a variable frequency compressor, 12 is an inverter drive unit, and 13 is a storage unit. In the storage unit 13, the inverter drive unit 12 drives the variable frequency compressor 11 at the time of refrigerant recovery for recovering the refrigerant from the outdoor heat exchanger 7 to the refrigerant heating type refrigeration cycle capable of heating operation during the cooling operation and the heating operation start. And a second F / V characteristic 14b in which the inverter drive unit 12 drives the variable frequency compressor 11 during heating operation.
And a third F / V in which the inverter drive unit 12 drives the variable frequency compressor 11 when the first F / V characteristic 14a shifts to the second F / V characteristic 14b during the refrigerant recovery.
The characteristic 14c is stored.

FIG. 3 shows the outline of the control of the heating operation control device of the refrigerant heating type air conditioner of the first embodiment when the present invention is used.

First, in step 100, a heating operation start signal is received, and in step 101, refrigerant is recovered from the outdoor heat exchanger 7 during the cooling operation and the heating operation to the refrigerant heating type refrigeration cycle capable of heating operation. Sometimes the inverter drive unit 12 drives the variable frequency compressor 11 with the first F
The variable frequency compressor 11 is started with the / V characteristic 14a to increase the frequency.

If the variable frequency compressor 11 has risen to the refrigerant recovery frequency in step 102, the refrigerant recovery is started in step 103. If the refrigerant recovery is completed in step 104, the process proceeds to step 105, and the cooling operation frequency is lowered to a predetermined value.

In step 106, the variable frequency compressor 11
Is falling to the predetermined cooling operation frequency, step 1
At the time of shifting from the first F / V characteristic 14a to the second F / V characteristic 14b at 07, the inverter drive unit 12 drives the variable frequency compressor 11 with the third F / V characteristic 14c, and the predetermined cooling is performed. The heating frequency is lowered to the predetermined heating operation frequency.

If the temperature has dropped to the predetermined heating operation frequency in step 108, the variable frequency compressor 11 is lowered to the low frequency using the second F / V characteristic 14b in step 109, and the heater 6 The variable frequency compressor 11 is kept on standby at a low frequency until the temperature rises.

By performing the control from step 100 to step 109, the heating operation control device for the refrigerant heating type air conditioner as described in claim 1 becomes possible.

FIG. 4 is a schematic control of the heating operation device of the refrigerant heating type air conditioner of the second embodiment when the present invention is used.

First, in step 200, the heating operation start signal is received, and in step 201, during the cooling operation and during the heating operation, the refrigerant is recovered from the outdoor heat exchanger 7 to the refrigerant heating type refrigeration cycle capable of heating operation. The first F / V in which the inverter drive unit 12 drives the variable frequency compressor 11
The variable frequency compressor 11 is started with the characteristic 14a to increase the frequency.

In step 202, the variable frequency compressor 11
Is increased to the refrigerant recovery frequency, step 203
Refrigerant recovery starts. If the refrigerant recovery is completed in step 204, in step 205, the second inverter drive unit 12 drives the variable frequency compressor 11 during the heating operation.
The third F / V characteristic 14 in which the inverter drive unit 12 drives the variable frequency compressor 11 when shifting to the F / V characteristic 14b
Moving to c, the variable frequency compressor 11 is lowered to a predetermined heating operation frequency.

In step 206, the variable frequency compressor 11
Is falling to the predetermined heating operation frequency, step 2
At 07, the second F / V characteristic 14b is entered, the variable frequency compressor 11 is lowered to a low frequency, and the variable frequency compressor 11 is kept on standby at a low frequency until the temperature of the heater 6 rises.

If the control from step 200 to step 207 is performed, the heating operation control device for the refrigerant heating type air conditioner as defined in claim 2 becomes possible.

FIG. 5 shows an outline of the control of the heating operation control device of the refrigerant heating type air conditioner of the third embodiment when the present invention is used.

First, in step 300, a heating operation start signal is received, and in step 301, refrigerant is recovered from the outdoor heat exchanger 7 to the refrigerant heating type refrigeration cycle capable of heating operation during cooling operation and heating operation start. Sometimes the inverter drive unit 12 drives the variable frequency compressor 11 with the first F
The variable frequency compressor 11 is started with the / V characteristic 14a to increase the frequency.

If the variable frequency compressor 11 has increased to the refrigerant recovery frequency in step 302, the refrigerant recovery is started in step 303. If the refrigerant recovery is completed in step 304, the process proceeds to step 305, where the cooling operation frequency is lowered to a predetermined cooling operation frequency which is the same as the heating operation low frequency.

If the variable frequency compressor 11 is lowered to the predetermined cooling operation frequency in step 306, the inverter is used when the first F / V characteristic 14a is changed to the second F / V characteristic 14b in step 307. By the third F / V characteristic 14c in which the drive unit 12 drives the variable frequency compressor 11,
Moving to the second F / V characteristic 14b, the variable frequency compressor 11 is kept on standby at a low frequency until the temperature of the heater 6 rises.

If the control from step 300 to step 307 is performed, the heating operation control device of the refrigerant heating type air conditioner as described in claim 3 becomes possible.

[0038]

As is apparent from the above description, claim 1
In the invention described in (1), the inverter drive unit drives the variable frequency compressor at the time of refrigerant recovery for recovering the refrigerant from the outdoor heat exchanger to the refrigerant heating type refrigeration cycle capable of heating operation during the cooling operation and the heating operation start. Second F / V characteristic of the variable frequency compressor and the inverter drive unit driving the variable frequency compressor during the heating operation.
The F / V characteristic of the inverter and the variable frequency compressor when the refrigerant drive recovers from the predetermined cooling operation frequency of the first F / V characteristic to the predetermined heating operation frequency of the second F / V characteristic. By providing the storage unit that stores the third F / V characteristic that drives the variable frequency compressor, the maximum control frequency of the variable frequency compressor during heating operation is not limited, and the variable frequency compression is performed during heating operation of the refrigerant heating air conditioner. It enables the machine to operate at high frequencies.

Further, in the invention described in claim 2, the inverter drive unit is variable at the time of refrigerant recovery for recovering the refrigerant from the outdoor heat exchanger to the refrigerant heating type refrigeration cycle capable of the heating operation at the time of the cooling operation and the start of the heating operation. A first F / V characteristic that drives the frequency compressor, a second F / V characteristic that the inverter drive unit drives the variable frequency compressor during the heating operation, and a refrigerant recovery frequency of the first F / V characteristic. To the third F / V from the above to the predetermined heating operation frequency of the second F / V characteristic
By providing the storage unit for storing the characteristics, it is possible to suppress the power consumption after the recovery of the refrigerant.

According to the third aspect of the present invention, the inverter drive unit has a variable frequency when the refrigerant is recovered from the outdoor heat exchanger to the refrigerant-heated refrigeration cycle capable of the heating operation at the time of the cooling operation and the start of the heating operation. The first F / V characteristic that drives the compressor, the second F / V characteristic that the inverter drive unit drives the variable frequency compressor during heating operation, and the predetermined F / V characteristic after the refrigerant recovery A memory for storing a third F / V characteristic in which the inverter driving unit drives the variable frequency compressor when the refrigerant operating frequency shifts to the heating operating frequency having the same frequency as the predetermined cooling operating frequency of the second F / V characteristic. By providing the section, it is possible to shift from the first F / V characteristic to the second F / V characteristic only by changing the input voltage.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a refrigerant heating type air conditioner controlled by the present invention.

FIG. 2 is a configuration diagram of a drive unit of a variable frequency compressor 3 according to the present invention.

FIG. 3 is a control flowchart of the heating operation control device according to the first embodiment of the present invention.

FIG. 4 is a control flowchart of the heating operation control device according to the second embodiment of the present invention.

FIG. 5 is a control flowchart of the heating operation control device according to the third embodiment of the present invention.

FIG. 6 is an explanatory diagram of an operation example according to the present invention.

[Explanation of symbols]

1 Indoor unit 2 outdoor unit 3,11 Variable frequency compressor 4 Indoor heat exchanger 5 two-way valve 6 heater 7 Outdoor heat exchanger 8 pressure reducer 9 Check valve 10 four-way valve 12 Inverter drive 13 Storage 14a First F / V characteristic 14b Second F / V characteristic

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiko Ao 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-6-42831 (JP, A) JP-A-5-203278 (JP, A) JP-A-5-227792 (JP, A) JP-A-4-281144 (JP, A) JP-A-61-289279 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 11/02 102

Claims (3)

(57) [Claims] 1. A refrigerant heating type refrigeration cycle capable of heating operation in which a variable frequency compressor, an indoor heat exchanger, a two-way valve, and a heater are connected in an annular shape, a variable frequency compressor, an outdoor heat exchanger, a pressure reducer, A non-return valve and a refrigerating cycle in which an indoor heat exchanger is annularly connected and capable of cooling operation, an inverter driving unit for driving the variable frequency compressor, and an output frequency and an output voltage of the inverter driving unit used during cooling operation. Ratio is first
F / V characteristics and second F / V used during heating operation
In the heating start control device of the refrigerant heating type air conditioner, which is provided with a storage unit for storing the characteristic and the third F / V characteristic used at the time of refrigerant recovery, the first F / V after the heating operation start signal is received. The variable frequency compressor is started with the characteristic, the operating frequency is increased to the refrigerant recovery frequency to perform the refrigerant recovery, and after the refrigerant recovery is completed, it is lowered to the predetermined cooling operation frequency with the first F / V characteristic, With the third F / V characteristic, the temperature is lowered from the predetermined cooling operation frequency in the first F / V characteristic to the predetermined heating operation frequency in the second F / V characteristic, and heating is performed in the second F / V characteristic. A heating start-up control device for a refrigerant heating type air conditioner, which is characterized in that it is lowered to a low frequency of operation. 2. After receiving the heating operation start signal, the variable frequency compressor is started with the first F / V characteristic to raise the temperature to the refrigerant recovery frequency to recover the refrigerant. The refrigerant according to claim 1, wherein the third F / V characteristic lowers from the refrigerant recovery frequency of the first F / V characteristic to the low frequency of the heating operation of the second F / V characteristic. Heating start control device for heating type air conditioner. 3. After the heating operation start signal is received, the variable frequency compressor is started by using the first F / V characteristic to raise the frequency to the refrigerant recovery frequency to recover the refrigerant, and after the refrigerant recovery is completed. And lowering to a predetermined cooling operation frequency which is the same as the low frequency of the heating operation to obtain the second F with the third F / V characteristic.
The heating start-up control device for a refrigerant heating type air conditioner according to claim 1, wherein the heating operation control device shifts to a low frequency of the heating operation of / V characteristic.