JP2001091097A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner, capable of effectively low humidity operating and reheat dry operating without impairing a heat exchanging efficiency of an indoor heat exchanger, when it is cooled and when it is heated. SOLUTION: An indoor heat exchanger is constituted of at least front heat exchangers 5a, 5b and a rear heat exchangers 5c. The exchangers 5a, 5b and the exchanger 5c are connected in series via a throttling mechanism 6, and a bypass passage 8 is provided in parallel with both ends of a series circuit of the exchanger 5c and the mechanism 6. A movable panel for rotatably opening and closing an upper suction port is provided at the upper suction port arranged opposed to the exchanger 5c. It is controlled so that when the mechanism 6 is fully closed at low humidity cooling, a check valve 7 is opened simultaneously, while the panel 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 capable of effectively performing a dehumidifying operation without lowering a room temperature.

[0002]

2. Description of the Related Art Conventional air conditioners include, for example, those shown in FIGS. In the figure, 21 is a compressor, 22 is a heating operation of the flow of the refrigerant discharged from the compressor 21,
A four-way valve that switches according to cooling operation or the like, 23 is an outdoor heat exchanger, 24 is an expansion valve, 25 is an indoor heat exchanger, and these are sequentially connected to form a refrigeration cycle, and the indoor heat exchanger 25 is an indoor heat exchanger. An upper heat exchanger 25a which is arranged in an air passage 30 connecting an upper inlet port 28 and an upper suction port 28 and a lower outlet port 29 on the front face of the unit 27, the front face of which is inclined forward of the air passage 30; The rear heat exchanger 25c connected to the upper part of the upper heat exchanger 25a and inclined to the rear of the air passage 30 and the lower heat exchanger 25b connected to the lower part of the upper heat exchanger 25a and set up vertically are almost reversed. V
They are arranged in a letter-like combination. Further, a blower fan 31 is arranged in the air passage 30 inside the indoor heat exchanger 25. In the refrigeration cycle, the upper heat exchanger 25a, the lower heat exchanger 25b, and the rear heat exchanger 25c are connected in parallel, and an opening / closing valve 26 is provided at an inlet of the rear heat exchanger 25c during a cooling operation. ing.

In the above configuration, the four-way valve 2 is switched so that the refrigerant circulates in the direction of the solid arrow during the cooling operation and circulates the refrigerant in the direction of the dashed arrow during the heating operation. During the cooling operation and the heating operation, the on-off valve 26 is fully opened, and the refrigerant branches off to each of the indoor heat exchangers 25a, 25b, and 25c, and performs air conditioning so that heat can be efficiently exchanged. When the dehumidifying (dry) operation is performed, the on-off valve 26 is closed, the refrigerant is not flown into the rear heat exchanger 25c, and the upper suction port 28 is closed.
The uncooled raw air in the room is bypassed to the air passage 30, and the cool air dehumidified in the upper heat exchanger 25a and the lower heat exchanger 25b is mixed by the blower fan 10 to form the air outlet. It was sent indoors from 29. Thereby, the low humidity cooling operation in which the room temperature is not excessively lowered was performed.

[0004] However, there has been a demand for dehumidification that does not lower the room temperature and does not feel chills. As a countermeasure, for example, a method of a reheat dry operation in which cool air dehumidified by an evaporator is heated by an electric heater to return to an original temperature and then blown is used. However, there is a problem that the electric heater increases power consumption.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and has been made in consideration of the above-mentioned problems. It is an object of the present invention to provide an air conditioner capable of effectively driving.

[0006]

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 at an upper front part and an upper part of an indoor unit accommodating the indoor heat exchanger, an outlet is provided at a lower part of the front face, and the suction port is provided in an air passage connecting the inlet and the outlet. In the air conditioner in which the indoor heat exchanger is arranged at a position corresponding to the indoor heat exchanger and a blower fan is arranged inside the indoor heat exchanger, the indoor heat exchanger is at least a front heat exchanger and a rear heat exchanger. A heat exchanger connected to the front heat exchanger and the rear heat exchanger in series via a throttle mechanism, and a bypass having a valve body in parallel with the series circuit of the rear heat exchanger and the throttle mechanism. A channel is provided at the upper suction port facing the rear heat exchanger. The movable panel for opening and closing the same upper inlet provided at the same time the throttle mechanism at low humidity cooling operation fully closed, while opening the valve body, open the movable panel,
During the reheating dry operation, the throttle mechanism is controlled to a predetermined throttle, and at the same time, the valve is closed and the movable panel is opened.

[0007] In addition, while the throttle mechanism is fully closed during the cooling operation, the valve body is controlled to open while the movable panel is closed, and during the heating operation, the throttle mechanism is fully opened and the valve body is closed. On the other hand, it is configured to control to open the movable panel.

The front heat exchanger has an upper heat exchanger whose front surface 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 an exchanger.

Further, the upper heat exchanger and the lower heat exchanger are connected in parallel.

[0010] The rear heat exchanger has a heat exchange capacity larger than that of the upper heat exchanger and the lower heat exchanger.

Further, the throttle mechanism is formed by an expansion valve.

Further, the valve body is formed by a check valve.

Further, the valve body is formed by an electromagnetic valve.

Further, the movable panel is controlled to be always closed when the operation is stopped.

[0015]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. In FIGS. 1 and 2, 1
Is a compressor, 2 is a four-way valve that switches the flow of refrigerant discharged from the compressor 1 in accordance with heating operation, cooling operation, etc., 3 is an outdoor heat exchanger, 4 is an expansion valve, and 5a, 5b, 5c are indoor heat exchangers. These are sequentially connected by a vessel to form a refrigeration cycle. The indoor heat exchangers 5a and 5b are connected in parallel, and a throttle mechanism 6 is provided between the indoor heat exchangers 5a and 5b.
And a bypass mechanism 6 at both ends of a series circuit of the throttle mechanism 6 in parallel with each other via a valve element 7.

Reference numeral 9 denotes an indoor unit for accommodating the indoor heat exchangers 5a, 5b, 5c. The indoor unit 9 is provided with suction ports 10a, 10b in the upper and upper front portions thereof, and the outlet 11 in the lower front portion. Air passage 12 connecting inlets 10a, 10b and outlet 11
An upper heat exchanger 5a whose front surface is inclined forward of the air passage 12 at a position corresponding to the suction port 10a, and a lower portion vertically connected to a lower portion of the upper heat exchanger 5a. Heat exchanger
The rear heat exchanger 5c is disposed at a position corresponding to the suction port 10b, the blower fan 13 is disposed inside these indoor heat exchangers, and the air outlet 7 deflects the flow of air. The wind direction plate 14 is rotatably supported by a shaft. The upper suction port 10b is provided with a movable panel 15 for opening and closing the upper suction port 10b so as to be rotatable.

In the refrigeration cycle, the four-way valve 2 is switched so as to circulate the refrigerant in the direction of the solid line arrow during the cooling operation and to circulate the refrigerant in the direction of the broken line arrow during the heating operation. FIG. 3 shows the operation (control) of each part in each operation mode. At the time of the cooling operation, control is performed so that the throttle mechanism 6 is fully closed, and at the same time, the valve body 7 is opened and the movable panel 15 is closed. That is, the refrigerant is the rear heat exchanger 5c.
Instead of flowing to the bypass passage, the cooling operation is performed by the upper heat exchanger 5a and the lower heat exchanger 5b.

At the time of low humidity cooling operation, the valve mechanism 7 is opened while the throttle mechanism 6 is fully closed while the movable panel 15 is opened.
And control is performed so as to operate in the cooling cycle. That is,
Dehumidifying the upper heat exchanger 5a and the lower heat exchanger 5b, without flowing the refrigerant to the rear heat exchanger 5c, bypassing the uncooled raw air from the upper suction port 10b to the air passage 12, Mixing with the dehumidified cool air and the blower fan 13,
The air whose outlet temperature does not become extremely low is sent from the outlet 11 to the room.

At the time of the heating operation, control is performed so that the throttle mechanism 6 is fully opened, the valve body 7 is closed, and the movable panel 15 is opened. That is, the refrigerant is transferred to all indoor heat exchangers.
Run to 5a, 5b, 5c for heating operation.

During the reheating dry operation, the throttle mechanism 6 is controlled to a predetermined throttle, and at the same time, the valve element 7 is closed.
The movable panel 15 is opened, and control is performed so as to operate in a heating cycle. That is, the rear heat exchanger 5c is used as a condenser (reheater) to send warm air to the air passage 12, and the upper heat exchanger 5a and the lower heat exchanger 5b function as an evaporator to dehumidify (dry) cool air. Is sent to the air passage 12, mixed by the blower fan 13, and air that does not lower the room temperature is sent from the outlet 11 to the room.

The heat exchange capacity of the rear heat exchanger is made larger than that of the upper heat exchanger and the lower heat exchanger, and the rear heat exchanger is used for heating. It is possible to effectively save energy, in which heating needs to be larger than cooling.

Further, by forming the throttle mechanism with an expansion valve, a wide response can be achieved with a quick response.

[0023] Further, since the valve element is formed of a check valve, it is possible to reliably control the refrigerant to flow into the bypass only during the cooling operation cycle. Note that the same control as described above can be performed even if an electromagnetic valve is used for the valve body.

Further, by controlling the movable panel to be always closed when the operation is stopped, dust can be effectively prevented.

As a result, air can be effectively used for low-humidity operation and reheat dry operation without impairing the heat exchange efficiency of the indoor heat exchanger during cooling operation and heating operation, and energy can be saved. It becomes a harmony machine.

[0026]

As described above, according to the present invention, the low humidity operation and the reheat dry operation can be effectively performed during the cooling operation and the heating operation without impairing the heat exchange efficiency of the indoor heat exchanger. In addition, the air conditioner can save energy.

[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 diagram illustrating an operation state of each unit in each operation mode according to the present invention.

FIG. 4 is a configuration diagram of a refrigeration cycle of an air conditioner according to a conventional example.

FIG. 5 is a cross-sectional view of a conventional air conditioner.

[Explanation of symbols]

 Reference Signs List 1 compressor 2 four-way valve 3 outdoor heat exchanger 4 expansion valve 5a indoor heat exchanger (upper heat exchanger) 5b indoor heat exchanger (lower heat exchanger) 5c indoor heat exchanger (rear heat exchanger) 6 throttle mechanism (Expansion valve) 7 Valve (check valve) 8 Bypass path 9 Indoor unit 10a, 10b Suction port 11 Air outlet 12 Air passage 13 Blower fan 14 Wind direction plate 15 Movable panel

Claims (9)

[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 refrigerating cycle, and an indoor unit accommodating the indoor heat exchanger is provided with a suction port at an upper front portion and an upper portion thereof, and a blow outlet is provided at a lower front portion thereof. In the air conditioner in which an indoor heat exchanger is arranged at a position corresponding to the suction port in an air passage connecting the air outlet and a blower fan inside the indoor heat exchanger, The heat exchanger comprises at least a front heat exchanger and a rear heat exchanger, the front heat exchanger and the rear heat exchanger are connected in series via a throttle mechanism, and the rear heat exchanger and the throttle mechanism are connected in series. In parallel with the circuit, a bypass having a valve body is provided, a movable panel for opening and closing the upper suction port is provided at the upper suction port facing the rear heat exchanger, and the throttle mechanism is provided at the time of low humidity cooling operation. At the same time as fully closing and opening the valve body, An air conditioner characterized in that the movable panel is opened and the throttle mechanism is controlled to a predetermined throttle during a reheat drying operation, and at the same time, the valve body is closed and the movable panel is opened. 2. The control device controls the movable panel to be closed while simultaneously opening the throttle mechanism during the cooling operation and simultaneously closing the valve body during the heating operation. The air conditioner according to claim 1, wherein the movable panel is controlled to open. 3. An upper heat exchanger in which the front heat exchanger has a front surface inclined forward of the air passage, and a lower heat exchanger connected vertically to a lower portion of the upper heat exchanger. The air conditioner according to claim 1, comprising an exchanger. 4. The air conditioner according to claim 3, wherein the upper heat exchanger and the lower heat exchanger are connected in parallel. 5. The air conditioner according to claim 1, wherein a heat exchange capacity of the rear heat exchanger is larger than that of the upper heat exchanger and the lower heat exchanger. 6. The air conditioner according to claim 1, wherein said throttle mechanism is formed by an expansion valve. 7. The air conditioner according to claim 1, wherein the valve body is formed by a check valve. 8. The air conditioner according to claim 1, wherein the valve body is formed by a solenoid valve. 9. The air conditioner according to claim 1, wherein the movable panel is controlled to be always closed when the operation is stopped.