JP2002130794A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner, having enhanced efficiency of an indoor heat exchanger in normal cooling and heating operation and preventing sense of coldness from being produced by suppressing decrease in temperature of air diffused into a room in a dehumidifying operation. SOLUTION: The indoor heat exchanger comprises a main indoor heat exchanger 3a and an auxiliary indoor heat exchanger 3b, connected to each other in series via a first on/off valve 6. A bypass passage 8 with a second on/off valve 7 interposed therein is provided between a passage between the first on/off valve 6 and the auxiliary indoor heat exchanger 3b and a passage between a four way valve 2 and the main indoor heat exchanger 3a. A housing chamber, for housing the auxiliary indoor heat exchanger 3b, is formed by partitioning the interior of an indoor unit by a partitioning plate. A ventilation hole for connecting a wind path with an inlet, and an outlet is formed in the partitioning plate. In normal heating and cooling operation, the first on/off valve 6 is opened, the second on/off valve 7 is closed, and in dehumidifying operation, the first on/off valve 6 is closed and the second on/off valve 7 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to a structure and a control of an indoor heat exchanger capable of effectively performing a dehumidifying operation without lowering a room temperature.

[0002]

2. Description of the Related Art A conventional air conditioner of this type, for example, FIG.
, A compressor 21, a four-way valve 22, and two passes 23a, 23
An indoor heat exchanger 23 having a b structure, an expansion valve 24, and an outdoor heat exchanger 25 are sequentially connected to form a refrigeration cycle, and one of the indoor heat exchangers 23 at the time of cooling operation on one side 23b side. An on-off valve 26 is provided on the inlet side. In the cooling operation, the on-off valve 26 is opened, and the refrigerant circulates in the direction of the solid arrow. Compressor
The high-temperature and high-pressure gaseous refrigerant discharged from 21 is a four-way valve 22
Flows through the outdoor heat exchanger 25, and releases heat to the outside by heat exchange.
While passing through the indoor heat exchanger 23, it exchanges heat with the indoor air, cools the indoor air, absorbs heat and evaporates, becomes a low-temperature low-pressure gas, and returns to the compressor 1 via the four-way valve 2.

In the dehumidifying operation, the on-off valve 26 is closed,
Circulates in the direction of the double solid arrow. The flow of the refrigerant is the same as that in the above cooling operation, but the indoor heat exchanger 23 is of a capacity control system in which the heat exchange capacity of the refrigerant flowing through only one path 23a is halved. This makes it possible to increase the dehumidifying capacity even though the blowing temperature is higher than that of the normal cooling. However, in the case of the above-described capacity control method, the region in which the refrigerant circulates is as large as 50% of the entire indoor heat exchanger 23, so that the blow-out temperature may inevitably decrease and the person may feel chilly. In addition, when the indoor air volume is increased, the evaporation temperature of the heat exchanger becomes high, which causes a problem that the amount of dehumidification is reduced.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can improve the efficiency of an indoor heat exchanger during normal cooling and heating operations, and lower the temperature of air blown into a room during dehumidification operation. The purpose of the present invention is to provide an air conditioner that suppresses chills and does not make the user feel cold.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises sequentially connecting a compressor, a four-way valve, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger. A suction port is provided in the upper and / or upper part of the front of the indoor unit accommodating the indoor heat exchanger, and an outlet is provided in the lower part of the front, and the inlet is connected to an air passage connecting the inlet and the outlet. In the air conditioner in which the indoor heat exchanger is arranged corresponding to the mouth and a blower fan is arranged inside the indoor heat exchanger, the indoor heat exchanger is divided into a main indoor heat exchanger and an auxiliary indoor heat exchanger. And a serial connection via a first on-off valve, and between the four-way valve and the main indoor heat exchanger, and between the first on-off valve and the auxiliary indoor heat exchanger. , A bypass path is provided via a second on-off valve, On one side in the knit, a partition plate is used to form an accommodation room for accommodating the auxiliary indoor heat exchanger, and the partition plate is provided with a ventilation hole that communicates with an air passage connecting the suction port and the air outlet. And during cooling operation, the first
The on-off valve is opened, the second on-off valve is closed, and in the dehumidifying operation, the first on-off valve is closed and the second on-off valve is opened.

An upper heat exchanger in which the front surface of the main indoor heat exchanger is inclined forward of the air passage, and a lower heat exchanger which is vertically connected to a lower portion of the upper heat exchanger. And a rear heat exchanger connected to the upper part of the upper heat exchanger and inclined rearward of the air passage.

Further, the main indoor heat exchanger is constituted by a plurality of paths.

Further, the ventilation hole is formed in a rectangular shape whose height is substantially equal to the height of the auxiliary indoor heat exchanger.

The heat exchange capacity of the auxiliary indoor heat exchanger is less than half that of the main indoor heat exchanger.

[0010] Further, the first and second on-off valves and the second on-off valve are configured using electromagnetic valves.

[0011]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1, 2, 3 and 4, reference numeral 1 denotes a compressor, 2 denotes a four-way valve for switching the flow of refrigerant discharged from the compressor 1 in accordance with a heating operation, a cooling operation, or the like, and 3 a denotes a main indoor heat. Heat exchanger, 3b is an auxiliary indoor heat exchanger,
Reference numeral 4 denotes an expansion valve, and reference numeral 5 denotes an outdoor heat exchanger, which is sequentially connected to form a refrigeration cycle. The main indoor heat exchanger 3a and the auxiliary indoor heat exchanger 3b are connected to a first on-off valve 6 comprising an electromagnetic valve.
And a second on-off valve 7 between the four-way valve 2 and the main indoor heat exchanger 3a and between the first on-off valve 6 and the auxiliary indoor heat exchanger 3b. The configuration is such that a bypass path 8 is provided through the intermediary.

An indoor unit 9 accommodates the main indoor heat exchanger 3a and the auxiliary indoor heat exchanger 3b. The indoor unit 9 has suction ports 10a and 10b at the upper and upper front sides thereof, and the outlet 11 at the lower front side. The main indoor heat exchanger 3a is divided into three parts in an air passage 12 connecting the suction ports 10a, 10b and the air outlet 11, and a front surface thereof is positioned in front of the air passage 12 at a position corresponding to the suction port 10a. The upper heat exchanger 3a1, the lower heat exchanger 3a2 vertically connected to the lower part of the upper heat exchanger 3a1, and the rear heat exchanger at a position corresponding to the suction port 10b. 3a3, and these main indoor heat exchangers
A blower fan 13 is arranged inside 3a, and a wind direction plate 14 for deflecting the flow of air is rotatably supported at the outlet 11 by a rotatable shaft.

One side of the indoor unit 9 is provided with a partition plate 15 to provide an accommodation chamber 16 for accommodating the auxiliary indoor heat exchanger 3b, and the side walls of the partition plate 15 are provided with the suction ports 10a, 10
A ventilation hole 15a communicating with an air passage connecting the b and the outlet 11 is provided.

In the refrigerating cycle, the four-way valve 2 is switched so that the refrigerant circulates in the direction of the solid line arrow during the cooling operation, circulates the refrigerant in the direction of the broken line arrow in the heating operation, and circulates in the direction of the double solid line during the dehumidification operation. I have. FIG. 4 shows the operation (control) of each part in each operation mode. During normal heating and cooling operations, the first on-off valve 6 is opened and the second on-off valve 7 is closed.
The first opening / closing valve 6 is closed, and the second opening / closing valve 7 is opened to control so as to flow to the bypass passage 8 side.

The main indoor heat exchanger 3a has two paths, and the heat exchange capacity of the auxiliary indoor heat exchanger 3b is
3a or less, and the ventilation hole 15a is formed in a rectangular shape having a height approximately equal to the height of the auxiliary indoor heat exchanger 3b and a narrow width, so that the auxiliary hole is provided during the dehumidifying operation. The ventilation path on the side of the indoor heat exchanger 3b has a structure through which air does not easily pass, so the amount of dehumidification can be increased by lowering the evaporation temperature, and even if the total air volume is increased, the auxiliary indoor heat exchanger 3b Since the air volume is suppressed, it is possible to perform a dehumidifying operation at a high air volume where the blowing temperature does not decrease as compared with the conventional case.

As a result, by opening the first on-off valve 6 and closing the second on-off valve 7 during normal cooling operation and heating operation, both the main indoor heat exchanger 3a and the auxiliary indoor heat exchanger 3b are operated. When the dehumidifying operation is performed, the first on-off valve 6 is closed, the second on-off valve 7 is opened, and the auxiliary indoor heat exchanger is used.
By operating only 3b, it is difficult to pass through the wind in the ventilation path on the auxiliary indoor heat exchanger 3b side, and the dehumidification amount can be increased by lowering the evaporation temperature, and the total air volume can be increased. However, since the air volume of the auxiliary indoor heat exchanger 3b is suppressed, the air conditioner can perform a dehumidifying operation at a high air volume where the blow-out temperature does not decrease as compared with the conventional case.

[0017]

As described above, according to the present invention, efficient operation using both the main indoor heat exchanger and the auxiliary indoor heat exchanger can be performed during normal cooling operation and heating operation, and can be performed during dehumidifying operation. By operating only the auxiliary indoor heat exchanger, it is difficult to pass the wind in the ventilation path on the auxiliary indoor heat exchanger side,
By lowering the evaporation temperature, the amount of dehumidification can be increased.Also, even if the total air volume is increased, the air volume of the auxiliary indoor heat exchanger is suppressed, so that the dehumidification at a high air volume where the blowout temperature does not lower than before It becomes an air conditioner that can be operated.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing an embodiment of the air conditioner according to the present invention.

FIG. 3 is a perspective view of a main part showing an embodiment of the air conditioner according to the present invention.

FIG. 4 shows an operation state of each part in each operation mode according to the present invention.

FIG. 5 is a configuration diagram of a refrigeration cycle of an air conditioner according to a conventional example.

[Description of Signs] 1 Compressor 2 Four-way valve 3a Main indoor heat exchanger 3b Auxiliary indoor heat exchanger 4 Expansion valve 5 Outdoor heat exchanger 6 First on-off valve (solenoid valve) 7 Second on-off valve (solenoid valve) 8 Bypass path 9 Indoor unit 10a, 10b Suction port 11 Blow-out port 12 Air passage 13 Blow fan 14 Ventilation plate 15 Partition plate 15a Ventilation hole 16 Storage room

Claims (6)

[Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger,
An expansion valve and an indoor heat exchanger are sequentially connected to provide a refrigeration cycle, and an indoor unit accommodating the indoor heat exchanger is provided with a suction port at an upper front portion and / or an upper portion thereof, and a blow outlet is provided at a lower front portion thereof. An air conditioner comprising: an indoor heat exchanger corresponding to the suction port in an air passage connecting an outlet and an outlet; and a blower fan disposed inside the indoor heat exchanger. The heat exchanger comprises a main indoor heat exchanger and an auxiliary indoor heat exchanger, which are connected in series via a first on-off valve, and between the four-way valve and the main indoor heat exchanger, the first on-off switch A bypass path is provided between a valve and the auxiliary indoor heat exchanger via a second opening / closing valve, and a compartment for accommodating the auxiliary indoor heat exchanger is provided by a partition plate on one side in the indoor unit. Form and connect the inlet and outlet to the partition plate A ventilation hole communicating with the air passage is provided, and during normal heating and cooling operations, the first on-off valve is opened, and the second
An air conditioner wherein an on-off valve is closed, and the first on-off valve is closed and the second on-off valve is opened during a dehumidifying operation. 2. An upper heat exchanger in which a front surface of the main indoor heat exchanger is inclined forward of the air passage, and a lower heat exchanger vertically connected to a lower portion of the upper heat exchanger. Vessels,
The air conditioner according to claim 1, further comprising a rear heat exchanger connected to an upper portion of the upper heat exchanger and inclined rearward of the air passage. 3. The air conditioner according to claim 1, wherein the main indoor heat exchanger includes a plurality of passes. 4. The air conditioner according to claim 1, wherein the ventilation hole is formed in a rectangular shape whose height is substantially equal to the height of the auxiliary indoor heat exchanger. 5. The air conditioner according to claim 1, wherein a heat exchange capacity of the auxiliary indoor heat exchanger is less than half of that of the main indoor heat exchanger. 6. The air conditioner according to claim 1, wherein the first on-off valve and the second on-off valve use electromagnetic valves.