JP2977375B2 - 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 an air conditioner.

[0002]

2. Description of the Related Art An example of a conventional air conditioner is shown in FIG. A compressor 1, a four-way switching valve 2 for switching between a heating operation and a cooling operation, an indoor heat exchanger 3, a throttle device 5 such as an expansion valve, and an outdoor heat exchanger 6 are connected in this order by a refrigerant pipe 9 to form a refrigerant circuit. Have been.

During the heating operation, the four-way switching valve 2 is switched as shown by the solid line. Then, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 enters the indoor heat exchanger 3 via the four-way switching valve 2, where the refrigerant is condensed and liquefied by heating the indoor air sent by the fan 4, and has a low temperature.・ It becomes a high-pressure liquid refrigerant. The liquid refrigerant enters the expansion valve 5 and is adiabatically expanded by being throttled here, and then enters the outdoor heat exchanger 6 where it exchanges heat with the outside air sent from the fan 7 to evaporate and evaporate to a low temperature / low pressure. Gas refrigerant. Next, this gas refrigerant is sucked into the compressor 1 via the four-way switching valve 2 and the accumulator 8, where it is compressed again.

[0006] The temperature of the room air sucked by the fan 4 is detected by a room temperature sensor 10 and output to a controller 11. The controller 11 calculates a frequency corresponding to the temperature difference between the suction air temperature and the set temperature in the room and issues a command to the inverter 12. The inverter 12 changes the frequency of the power supplied to the motor 1 a for driving the compressor 1. , To control the number of rotations.

In the cooling operation, when the four-way switching valve 2 is switched as shown by a broken line, the gas refrigerant discharged from the compressor 1 receives the four-way switching valve 2, the outdoor heat exchanger 6, the expansion valve 5, and the indoor heat exchanger. The three- and four-way switching valve 2 and the compressor 1 are circulated in this order, and are cooled by exchanging heat with indoor air in the process of flowing through the indoor heat exchanger 3.

[0006]

In the conventional air conditioner, as the heating load increases and the temperature difference between the indoor set temperature and the intake air temperature increases, the inverter 12
, The number of revolutions of the motor 1a of the compressor 1 increases, so that the noise level increases.

[0007]

According to the present invention, in order to solve the above problems, a bypass pipe is provided in parallel with a refrigerant pipe connecting the four-way switching valve and the indoor heat exchanger, and the bypass pipe flows through the bypass pipe. interposed the refrigerant heat accumulator encapsulating heat medium heat exchanger which, respectively provided off valve and the refrigerant pipe and the bypass pipe, wherein during high heating load as well as opening and closing the on-off valve in accordance with the heating load Provided is an air conditioner provided with a controller for reducing the number of revolutions of a compressor.

[0008]

Since the air conditioner according to the present invention has the above-described structure, when the heating load is small, the refrigerant discharged from the compressor is guided to the regenerator to heat the refrigerant gas therein. Can be stored in the heat medium. When the heating load is large, the refrigerant is guided to the regenerator, and the refrigerant absorbs heat from the heat medium, thereby increasing the amount of heat possessed by the refrigerant and guiding the refrigerant to the indoor heat exchanger. Since the amount of retained heat of the refrigerant flowing through the heat exchanger increases, the controller can reduce the number of revolutions of the compressor and reduce the noise level generated from the compressor and the motor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to an embodiment shown in FIG. In FIG. 1, the same parts as those of the conventional apparatus shown in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted.

A bypass pipe 21 is provided in parallel with the refrigerant pipe 9 connecting the four-way switching valve 2 and the indoor heat exchanger 3, and a heat storage unit 22 is interposed in the bypass pipe 21. The heat storage unit 22 is formed of a heat exchanger such as a shell-and-tube type. The refrigerant of the air conditioner flows through the heat transfer tube 22a, and a heat medium such as water or paraffin is sealed in the shell 22b. ing.

A main valve 23 and a bypass valve 24 are interposed in the refrigerant pipe 9 and the bypass pipe 21, respectively, to switch the flow path of the refrigerant.

The controller 31 controls the inverter 12 in accordance with the temperature difference ΔT between the suction air temperature detected by the room temperature sensor 10 and the set temperature in the room, and controls the temperature of the heat medium detected by the heat medium sensor 32. To control the opening and closing of the main valve 23 and the bypass valve 24, or to control the opening and closing of these valves.

The other structure is the same as that of the conventional one shown in FIG. 2. As described above, the corresponding members are denoted by the same reference numerals.

In the present apparatus, during the heating operation, the intake air temperature detected by the room temperature sensor 10 is input to the frequency calculating means 33 of the controller 31, where the set temperature input from the setting means 34 and the storage means 35 The required frequency H is calculated from the input storage data. Here, the required frequency corresponding to the temperature difference ΔT between the set temperature and the intake air temperature is stored in the storage data.

The required frequency H calculated by the frequency calculating means 33 is input to the comparing means 36, where the setting means 37
_Is compared with the basic frequency H _O input from

As the basic frequency H _O , for example, a frequency that is an allowable upper limit for noise is set.

When the heating load is large and the required frequency H exceeds the basic frequency H _O , the main valve 23 is opened via the output means 38 and the bypass valve 24 is closed. Further, the output is output from the output means 38 to the inverter 12, and the inverter 12 changes the required frequency H to increase the rotation speed of the motor 1a.

Then, the capacity of the compressor 1 is increased, the heat exchange capacity of the indoor heat exchanger 3 is increased, and high-temperature air is blown into the room.

On the other hand, when the heating load is small and the required frequency H is lower than the basic frequency H _O , it is output to the correction means 39. At this time, the heat medium temperature T detected by the heat medium sensor 32 is input to the mode discriminating means 40, and the setting means 41
The mode is determined based on the basic temperature T _O input from the CPU. Here, the basic temperature T _O represents the discharge gas temperature of the compressor 1 corresponding to the basic frequency H _O.

When the basic temperature T _O is higher than the heat medium temperature T, the mode is determined to be the heat radiation mode and output to the correction means 39.
The correction unit 39 corrects the frequency based on the signals from the comparison unit 36 and the mode determination unit 40 and the storage data input from the storage unit 42.

In this storage data, a correction value of a frequency corresponding to a heat radiation amount in the heat storage unit 22 described later is stored corresponding to the heat medium temperature T, and the correction value of the correction frequency H _C , the required frequency H and the basic frequency H _O is stored. It is a value between.

The main valve 23 is closed and the bypass valve 24 is opened in response to a command from the output means 38 which has received a signal from the correction means 39. Further, output means 3
Is output from the 8 to the inverter 12, the inverter 12 increases the rotation speed of the motor 1a is changed to correct the frequency H _C.

Then, the high-temperature refrigerant gas discharged from the compressor 1 passes through the bypass pipe 21 through the four-way switching valve 2 and partially radiates heat to the heat medium in the process of flowing through the regenerator 22, and then indoor heat exchange. Enters the vessel 3 where the room air is heated.

Thus, during this time, heat is stored in the heat medium of the heat storage unit 22.

On the other hand, when the heat medium temperature T is higher than the basic temperature T _O in the state where the heat is stored in the heat storage device 22 as described above, the mode determining means 40 determines that the heat absorbing mode is present and outputs the result to the correcting means 39. Is done. The correction unit 39 corrects the frequency based on the signals from the comparison unit 36 and the mode determination unit 40 and the storage data input from the storage unit 42. The stored data includes the heat accumulator 2 corresponding to the heat medium temperature T.
2, the correction value of the frequency corresponding to the heat absorption amount is stored, and the correction frequency H _C is set to a value smaller than the required frequency H.

Then, the main valve 23 is closed and the bypass valve 24 is opened in response to a command from the output means 38 to which a signal from the correction means 39 is input. Further, output means 3
Is output from the 8 to the inverter 12, the inverter 12 decreases the rotation speed of the motor 1a is changed to correct the frequency H _C.

Then, the high-temperature refrigerant gas discharged from the compressor 1 passes through the bypass pipe 21 through the four-way switching valve 2, absorbs heat from the heat medium in the process of flowing through the regenerator 22, and increases the amount of retained heat. Thereafter, the air enters the indoor heat exchanger 3, where the indoor air is heated.

As described above, in the present apparatus, when the heating load is small, the refrigerant discharged from the compressor 1 can be stored in the heat medium enclosed therein by leading the refrigerant to the regenerator 22.

Then, when the heating load is large, the refrigerant discharged from the compressor 1 is guided to the regenerator 22 to absorb heat from the heat medium, thereby increasing the heat capacity of the refrigerant. For this reason, the frequency of the current supplied to the motor 1a via the inverter 12 can be made lower than the required frequency H and the number of revolutions of the motor 1a can be reduced, so that the noise level can be reduced. As described above, the present invention has been specifically described based on the illustrated embodiments. However, it is needless to say that the specific configuration and the like may be appropriately changed within the scope of the present invention. For example,
Various configurations other than those shown in the drawings can be adopted as the configuration of the controller 31 as long as the controller 31 controls the storage device to perform heat storage and heat release during the heating operation according to the present invention.

[0030]

According to the present invention, a compressor, a four-way switching valve,
In the air conditioner in which the indoor heat exchanger, the expansion device, and the outdoor heat exchanger are connected in this order, a bypass pipe is provided in parallel with a refrigerant pipe connecting the four-way switching valve and the indoor heat exchanger. A heat storage device, which encloses a heat medium that exchanges heat with a refrigerant flowing therethrough, is provided, and an on-off valve is provided on each of the refrigerant pipe and the bypass pipe, and the on-off valve is opened and closed according to a heating load. High heating load with opening and closing valve
Sometimes a controller for lowering the rotation speed of the compressor is provided, so that when the heating load is low, the refrigerant is guided to the regenerator and heat is stored in the heat medium enclosed therein. By absorbing heat, the heat capacity of the refrigerant can be increased, and in response to the increase in the heat capacity of the refrigerant, the controller reduces the number of revolutions of the compressor motor during a high heating load. Can be reduced, and the noise level can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a system diagram showing a conventional air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way switching valve 3 Indoor heat exchanger 5 Throttle device 6 Outdoor heat exchanger 9 Refrigerant pipe 21 Bypass pipe 22 Heat storage 22a Heat transfer pipe 22b Shell

────────────────────────────────────────────────── (5) References JP-A-1-257663 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24F 11/02 102 F25B 13/00 351

Claims (1)

(57) [Claims] 1. An air conditioner in which a compressor, a four-way switching valve, an indoor heat exchanger, a throttle device and an outdoor heat exchanger are connected in this order, a refrigerant pipe connecting the four-way switching valve and the indoor heat exchanger. On the other hand, a bypass pipe is provided in parallel, a heat accumulator that encapsulates a heat medium that exchanges heat with the refrigerant flowing through the bypass pipe is disposed, and an on-off valve is provided on each of the refrigerant pipe and the bypass pipe. Opens and closes the on-off valve according to the heating load and reduces the rotation speed of the compressor during a high heating load.
An air conditioner characterized in that a controller that.