JPH0868568A - Air conditioner - Google Patents

Abstract

PURPOSE: To provide an air conditioner which can conduct ideal comfortable air conditioning by optimally diffusing corresponding to the form of an indoor heat exchanger. CONSTITUTION: An air conditioner communicates a compressor 16, an outdoor heat exchanger 18, a motor operated expansion vale 19 and an indoor heat exchanger 5 via a refrigerant tube, and comprises a plurality of refrigerant flow passages 7 to 9 provided to be vertically divided in the indoor heat exchanger to independently heat exchange the upper and lower parts of the indoor heat exchanger, and first to third switching valves 13 to 15 provided in the respective passages to switch under predetermined conditions of cooling or heating operation mode.

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 improvement of a refrigerant flow path structure of an indoor heat exchanger and control thereof.

[0002]

2. Description of the Related Art A commonly used air conditioner comprises an indoor unit mounted on the wall surface of an air-conditioned room and an outdoor unit installed outdoors, and these units are connected by a refrigerant pipe and electric wiring. .

An indoor heat exchanger is housed in the indoor unit, and a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, etc. are housed in the outdoor unit. Most of the compressors described above are of a variable operating frequency type, and the operating frequency is controlled according to the air conditioning load.

In addition to switching between the cooling operation and the heating operation by switching the four-way valve, switching to the dehumidifying operation and the defrosting operation and operation control in a state where the room temperature is stable from the rising operation are performed. For example, fine-tuned control is performed according to the situation.

Both the indoor heat exchanger and the outdoor heat exchanger are so-called finned tube type in which a large number of extremely thin-walled fins are arranged in parallel with each other at a narrow interval and the heat exchange pipes are penetrated through these fins. Is used.

The fins are formed in a substantially strip shape having a short width direction and an extremely long vertical direction as compared with the width direction, and the heat exchange pipes are normally arranged in two rows in the width direction of the fins. , Penetrate at a predetermined interval in the vertical direction.

U-bends are connected to the open ends of the adjacent heat exchange pipes protruding from the fins at both ends. A refrigerant pipe extending from the outdoor unit is connected to the uppermost end and the lowermost end of the heat exchange pipes of the fins.

Therefore, a refrigerant passage of one system is formed in each heat exchanger, and the refrigerant is guided in a meandering manner with respect to the fins. Heat exchange air is introduced between the fins to perform heat exchange with the refrigerant.

[0009]

Each heat exchanger is constructed in this way, and the vertical dimension of the fins is the vertical dimension, and the total dimension of a large number of fins arranged in parallel is the horizontal dimension. The heat exchange area is set.

An air blowing fan that uniformly guides the heat exchange air over the entire surface of the heat exchanger is arranged so as to face the heat exchanger to prevent partial unevenness of heat exchange efficiency in the heat exchanger. There is.

However, particularly in the indoor unit, cold air is likely to be accumulated near the floor surface of the air-conditioned room during the cooling operation, and conversely, warm air is likely to be accumulated near the ceiling during the heating operation. In both cases, a phenomenon opposite to that of comfortable air conditioning called so-called cold head heat tends to occur.

This is because heat exchange air is conducted over the entire surface of the indoor heat exchanger and is blown out from the unit as it is. Especially, when the room temperature is stable after the start-up operation, a large amount of heavy cold air sinks in the cooling operation. This is because in the heating operation, one lump of light warm air floats, and it is desired to employ some means for eliminating this.

Recently, for example, in the applicant of the present invention, the indoor heat exchanger is bent and formed in an inverted V shape and is constituted by a front heat exchanger and a rear heat exchanger. An air conditioner has been proposed in which the directional dimension is made smaller than the conventional straight type, a heat exchange area is sufficiently secured, and the vertical dimension of the entire indoor unit is reduced.

In the unit body having such a structure, a suction port is provided on the front side facing the front heat exchanger, and a suction port is provided on the upper side facing the rear heat exchanger. Here too, the optimum blowing structure must be considered.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an air conditioner that performs an optimum blow-out corresponding to the form of an indoor heat exchanger to achieve ideal comfortable air conditioning. It is the one we are trying to provide.

[0016]

In order to satisfy the above object, an air conditioner according to a first aspect of the present invention is the air conditioner according to the first aspect, wherein a compressor, a four-way valve, an outdoor heat exchanger, a decompressor and an indoor heat exchanger. In order to form a heat pump type refrigeration cycle by sequentially connecting the exchangers through a refrigerant pipe, the indoor heat exchanger is provided separately along the vertical direction, and is independent in each of the upper and lower parts of the indoor heat exchanger. It is characterized by comprising a plurality of refrigerant communication paths that perform a heat exchange action, and an on-off valve that is provided in each refrigerant communication path and that opens and closes under predetermined operating conditions such as cooling and heating operation.

In order to satisfy the above object, an air conditioner according to a second aspect of the present invention is the air conditioner according to claim 2, wherein the indoor unit is provided with suction ports on the front surface and the upper surface, and the indoor unit is disposed in the indoor unit. A front heat exchanger facing the suction port and a rear heat exchanger facing the upper suction port are combined in an almost inverted V shape with an indoor heat exchanger, and are divided in the vertical direction of the front heat exchanger. And a plurality of front side refrigerant passages that perform independent heat exchange operations in the upper and lower parts of the heat exchanger and the rear side heat exchanger, and heat exchange is performed independently of the front side refrigerant passages. It is characterized in that it has a rear refrigerant conducting path that operates, and an on-off valve that is provided in each of the front refrigerant conducting path and the rear refrigerant conducting path and that opens and closes under predetermined operating conditions such as cooling and heating operation. .

Claims 1 and 2 are defined as Claim 3.
An opening / closing valve provided in the refrigerant passage of the indoor heat exchanger upper part or the refrigerant passage of the front heat exchanger upper part and the refrigerant passage of the rear heat exchanger according to any one of the above, is closed during cooling operation, It is characterized in that heat exchange is not performed in each heat exchanger part.

Claims 1 and 2 are defined as Claim 4.
The opening / closing valve provided in the refrigerant conduction path at the lower part of the indoor heat exchanger or the refrigerant conduction path at the lower part of the front side heat exchanger described in any one of (1) to (5) is closed during heating operation, and heat exchange at each heat exchanger part is performed. The feature is that it does not work.

Claims 1 and 2 are defined as Claim 5.
Each of the on-off valves described in any one of (1) to (4) is characterized in that the on-off control is performed after a predetermined time has elapsed from the start of operation.

Claims 1 and 2 are defined as Claim 6.
Each of the on-off valves described in any one of 1 to 3 is characterized in that the on-off control is performed when the operating frequency is equal to or lower than a predetermined value.

Claims 1 and 2 are defined as Claim 7.
Each of the on-off valves described in any one of (1) to (5) is characterized in that the on-off control is performed when the indoor heat exchanger temperature is equal to or higher than a predetermined temperature.

Claims 1 and 2 are defined as claim 8.
Each of the on-off valves described in any one of (1) to (5) is characterized in that the on-off control is performed when the indoor heat exchanger temperature is equal to or lower than a predetermined temperature.

Claims 1 and 2 are defined as Claim 9.
Each of the on-off valves described in any one of (1) to (4) is arranged on the windward side of the indoor heat exchanger. A tenth aspect of the present invention is characterized in that each of the on-off valves according to the ninth aspect is arranged between a front heat exchanger that constitutes an indoor heat exchanger and a front suction port. As an eleventh aspect, each of the on-off valves according to the ninth aspect is arranged between a rear heat exchanger forming an indoor heat exchanger and an upper surface suction port.

[0025]

According to the first aspect of the invention, the opening / closing valve opens and closes the plurality of refrigerant passages provided in the indoor heat exchanger under the predetermined conditions of the cooling / heating operation mode. Intentionally, a non-heat exchange part is created in the indoor heat exchanger to allow fresh air to flow therethrough, and is blown out in a state of being superposed with the air that has undergone heat exchange in other parts. Depending on the heating / cooling operation, the upper and lower positions where the raw air overlaps the heat exchange air are set to obtain comfortable cooling / heating.

A second aspect of the present invention comprises a plurality of front side refrigerant passages provided in the front side heat exchanger constituting the inverted V-shaped indoor heat exchanger and a plurality of front side refrigerant passages provided in the rear side heat exchanger. The on-off valve opens and closes under a predetermined condition of the cooling / heating operation mode.

In this case as well, the non-heat exchange portion is intentionally formed in each heat exchanger to allow the fresh air to pass therethrough, and the heat-exchanged air is superposed on the other portion and blown out. Depending on the heating / cooling operation, the upper and lower positions where the raw air overlaps the heat exchange air are set to obtain comfortable cooling / heating.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The air conditioner includes an indoor unit A and an outdoor unit B. The unit body 1 which constitutes the indoor unit A is provided with suction ports 2 and 3 on the front surface and the top surface thereof, and the grills 2a and 3a are fitted therein. An outlet 4 is provided at the lower part of the front surface, and a grill 4a is rotatably supported on the outlet 4.

Further, in the unit main body 1, an indoor heat exchanger 5 configured as described later and the indoor heat exchanger 5 are provided.
The blower fan 6 arranged in the vicinity of is housed. The indoor heat exchanger 5 includes a front heat exchanger 5A and a rear heat exchanger 5B.
And are combined in an inverted V shape. The front side heat exchanger 5
A is further provided with a plurality of notches at predetermined intervals in the vertical direction, and is bent inward at the same angle and in multiple stages along the notches. The rear side heat exchanger 5B
Is formed in a straight shape and is inclined at a gentle angle as compared with the front heat exchanger 5A.

The front heat exchanger 5A of the indoor heat exchanger 5 is arranged to face the front inlet 2, and the rear heat exchanger 5B is arranged to face the upper inlet 3. The blower fan 6 is arranged between the front heat exchanger 5A and the rear heat exchanger 5B.

The indoor heat exchanger 1 is of a so-called finned tube type, and is constructed as described above. Here, heat passing through the fins in the lower half of the front heat exchanger 5A is used. A lower front refrigerant passage (hereinafter referred to as a first passage) 7 connected to an exchange pipe and a front upper refrigerant passage (hereinafter referred to as a first passage) connected to a heat exchange pipe penetrating the fins in the upper half of the front heat exchanger. 2 It is called a conduction path) 8
And are provided separately.

That is, the first conduction path 7 provided on the lower side and the second conduction path 8 provided on the upper side are provided with the center portion of the front heat exchanger 5A in the vertical direction as a boundary. on the other hand,
The rear heat exchanger 5B is provided with an independent rear refrigerant passage (hereinafter referred to as a third passage) 9.

Branch pipes 10 are connected to both ends of each of the refrigerant passages 7 to 9, respectively. The branch pipes 10 on one end side are connected to a branch joint 11, and the branch pipes 10 on the other end side are connected. Are connected to the junction body 12.

In the middle of each of the branch pipes 10 ... Connected to the branch joint 11, there are provided first to third on-off valves 13 to 15 each of which is an electromagnetic two-way valve. It is electrically connected to a control circuit (not shown) to control opening and closing.

In the outdoor unit B, the compressor 16
The four-way valve 17, the outdoor heat exchanger 18, and the electric expansion valve 19 which is a pressure reducing device are housed. Further, a blower fan (not shown) is arranged near the outdoor heat exchanger 18.

Refrigerant pipe Pa extending from the four-way valve 17
Is connected to the merging port body 12 on the indoor unit A side, and the refrigerant pipe Pb extending from the electric expansion valve 19 is connected to the branch joint 11.

Therefore, from the compressor 16 to the four-way valve 1
7, the outdoor heat exchanger 18, the electric expansion valve 19, and the indoor heat exchanger 5 are sequentially connected via the refrigerant pipes Pa and Pb to form a heat pump type refrigeration cycle.

To explain further, in the indoor heat exchanger 5 and its front and rear positions, the branch joint 11 is passed through a plurality of branch pipes 10 ..., First to third conduction paths 7 to 9 and a plurality of branch pipes 10 ... Three parallel circuits are formed here, which reach the confluence body 12.

The compressor 16 is electrically controlled by the control circuit so that the operating frequency is variable. The four-way valve 17, the electric expansion valve 19 and the blower fan 6 are also electrically controlled by the control circuit.

In the refrigeration cycle provided with such an indoor heat exchanger 5, a four-way valve 17 is provided so as to conduct the refrigerant in the direction of the arrow in the drawing during the cooling operation and to conduct the refrigerant in the direction of the broken arrow in the drawing during the heating operation. Switch.

The control circuit, in the rising state in both the heating and cooling operation, has the first to third on-off valves 13 to 1 described above.
Both 5 are cut off to control opening. That is, in the cooling start-up operation, the liquid refrigerant is shunted from the electric expansion valve 19 through the branch joint 11 to the branch pipes 10 by the same amount, passes through the first to third on-off valves 13 to 15, and then the first to third valves. It is led to the third conducting paths 7 to 9.

Therefore, the refrigerant is introduced over the entire surface of the front side heat exchanger 5A and the rear side heat exchanger 5B constituting the indoor heat exchanger 5, and heat-exchanges with the heat exchange air to evaporate. The entire indoor heat exchanger 5 is used to perform a cooling operation with a large heat exchange capacity.

The refrigerant evaporated in each of the conduits 7 to 9 is guided from the branch pipes 10 to the merging port body 12 and merges with each other, and is guided to the compressor 16 via the four-way valve 17. In the heating start-up operation, the gas refrigerant is diverted from the four-way valve 17 through the merging port body 12 into the branch pipes 10 by the same amount, and is guided to the first to third conduction paths 7 to 9.

Therefore, the refrigerant is introduced over the entire surface of the front side heat exchanger 5A and the rear side heat exchanger 5B constituting the indoor heat exchanger 5, and is condensed by exchanging heat with the heat exchange air. The entire indoor heat exchanger 5 is used to perform a heating operation with a large heat exchange capacity.

The refrigerant condensed in each of the conducting paths 7 to 9 is branched from the branch pipes 10 to the first to third on-off valves 13 to 15.
Through the branch joint 11, and is led to the electric expansion valve 19.

When a predetermined time elapses from the start-up during the cooling operation and the room temperature falls below the set temperature and a stable state is maintained, the control circuit causes the second on-off valve 14 to operate, as shown in FIG. 2 (A). Then, the third opening / closing valve 15 is energized to control the closing of the valve. The first opening / closing valve 13 maintains the open state.

The liquid refrigerant introduced from the electric expansion valve 19 is blocked from conduction by the second and third opening / closing valves 14 and 15, while passing only the first opening / closing valve 13. Then, it is guided to the first conduction path 17 provided on the lower side of the front side heat exchanger 5A constituting the indoor heat exchanger 5, and the heat exchange action at the lower side of this heat exchanger is continued.

On the other hand, since the second and third on-off valves 14 and 15 are closed, the liquid refrigerant is in the second conduction path 8 on the upper side of the front heat exchanger 5A and the second heat exchanger 5B of the rear heat exchanger 5B. 3 does not conduct to the conduction path 9, and there is no heat exchange action in each part.

Therefore, the heat exchange air sucked into the unit body 1 from the front inlet 2 of the indoor unit A is
Only the air conducted through the lower part of the front heat exchanger 5A is heat-exchanged into cold air, and the wind conducted through the upper part of the front heat exchanger 5A and the air conducted through the rear heat exchanger 5B from the upper surface suction port 3 are heat-exchanged. There is no fresh air.

Due to the structure of the indoor heat exchanger 5, the layout of the blower fan 6 and the outlet 4, the air blown from the outlet 4 into the air-conditioned room is necessarily conducted through the lower part of the front heat exchanger 5A. The cold air is on the upper side, and the raw air that conducts the upper part of the front side heat exchanger 5A and the rear side heat exchanger 5B and does not perform the heat exchanging action is in the lower side and has two layers.

In particular, since the indoor heat exchanger 5 is an inverted V-shaped heat exchanger and is separated into the front side heat exchanger 5A and the rear side heat exchanger 5B, the cold air inside the unit main body 1 and the raw heat exchanger 5A are separated from each other. The air can be reliably separated, and the blowout port 4 is also separated to some extent and blown out.

As shown in FIG. 6B, since the cool air is heavier than the fresh air, it tends to descend from the unit A toward the floor with a steep slope, but is blown out along this lower side. Fresh air, which is warmer than cold air, blows out the cold air in a raised state.

Eventually, the cool air is guided along the position separated from the floor surface, and cools the air-conditioned room without unevenness. And, because the cold air does not fall down, a comfortable air conditioner that does not have chills is obtained.

The second and third opening / closing valves 14 and 15 are
As the closing condition of (1), it is performed in a state where a predetermined time has elapsed from the start-up during the cooling operation, but it is not limited to this.

For example, the control circuit may control the closing frequency of the second and third on-off valves 14 and 15 at the timing when the operating frequency of the compressor 16 is controlled to a predetermined low frequency. In this case, the contents are the same as the above control conditions.

Further, when the temperature value detected by the temperature sensor for detecting the temperature of the indoor heat exchanger 5 becomes equal to or higher than the set temperature stored in the control circuit, the valve closing control may be performed. .

That is, when the valve control is performed in a state where the temperature of the indoor heat exchanger 5 is below the dew point temperature, the unit body 1
The air cooled to below the dew point temperature and the raw air are mixed to a certain extent, and dew condensation occurs on the blower fan 6 and the outlet 4 in the unit body 1.

Therefore, when only a part of the front side heat exchanger 5A performs the heat exchange action, the temperature above the set temperature (condensation condition temperature) is set so that the raw air from the other part does not condense in the unit body 1. When this happens, the valve closing control is performed.

Further, when the detected temperature value of the temperature sensor for detecting the temperature of the indoor heat exchanger 5 becomes equal to or lower than the set temperature stored in the control circuit, the valve closing control may be performed. .

That is, when the temperature of the indoor heat exchanger 5 becomes equal to or lower than the set temperature, the amount of cold air blown out from the blowout port 4 becomes extremely large, and immediately falls to the floor surface to make people feel chilly. Therefore, the second and third on-off valves 14 and 15 are closed to obtain the above-described action of lifting the cool air by the fresh air.

In any case, each on-off valve 13 to 15
And the second and third on-off valves 14, 15
The louver 4 provided at the outlet 4 with the closed
It is advisable to adjust the rotation of “a” to an appropriate angle. and again,
Needless to say, controlling the number of revolutions of the blower fan 6 in each state is more effective.

Further, in the above embodiment, the second and third on-off valves 14 and 15 are controlled to be closed, and the first on-off valve 13 is opened. However, before controlling to this state, Only the third on-off valve 15 is closed, and the first and second on-off valves 1
It is also possible to open the valves 3 and 14 and increase the amount of raw air sequentially while maintaining a certain cooling capacity.
According to this, since the amount of raw air increases in sequence, a sudden change in room temperature is not caused, and comfort is further improved.

On the other hand, when a predetermined time elapses from the start-up during heating operation and the room temperature rises above the set temperature and a stable state is maintained, the control circuit opens and closes the first open / close state as shown in FIG. 3 (A). The valve 13 is energized to control the closing of the valve. The second and third on-off valves 14 and 15 maintain the open state.

The gas refrigerant introduced from the four-way valve 17 is
From the place where the first on-off valve 13 is closed, there is no conduction to the first conduction path 7 provided under the front heat exchanger 5A,
From the place where the second and third on-off valves 14 and 15 are open, they are guided to the second conduction path 14 in the upper part of the front heat exchanger 5A and the third conduction path 15 of the rear heat exchanger 5B, The heat exchange action in these heat exchanger parts is continued.

Therefore, the heat exchange air sucked into the unit main body 1 through the upper portion of the front suction port 2 and the upper portion of the upper suction port 3 exchanges heat with the upper portion of the front heat exchanger 5A and the rear heat exchanger 5B to be changed into warm air. . The air conducted from the lower part of the front suction port 2 to the lower part of the front heat exchanger 5A has no heat exchange effect and remains as raw air.

Due to the structure of the indoor heat exchanger 5 and the positional relationship between the blower fan 6 and the outlet 4, the air blown from the outlet 4 into the air-conditioned room is inevitably conducted through the lower part of the front heat exchanger 5A. The raw air is on the upper side, and the warm air that has passed through the upper part of the front heat exchanger 5A and the rear heat exchanger 5B is in the lower two layers.

Since the warm air is lighter than the fresh air, it tries to rise steeply from the unit A toward the ceiling surface. However, the warm air blown along the upper side of the unit A is heavier than the warm air. Press down and blow out.

As a result, as shown in FIG. 7B, most of the warm air is guided along the floor surface, so that comfortable heating can be achieved in which the feet are concentrated and warmed. It becomes a so-called head cold foot heat, and even if the set room temperature is lowered, the actual feeling does not change, which leads to energy saving.

Further, in the above embodiment, the first opening / closing valve 13
Was closed and the second and third on-off valves 14, 15 were opened. However, if the second on-off valve 14 is further closed after controlling this state, the heat exchange area can be further increased. Can be reduced.

According to this, since the heat exchange area is further reduced, the rise of the warm air blown out can be further prevented, and the comfort feeling at room temperature is improved. As a closing condition of the first opening / closing valve 13, a predetermined time has elapsed from the start-up during the heating operation, and the room temperature rises to a set temperature or higher and is kept stable. It is not limited to this.

For example, the control circuit may control the operating frequency of the compressor 16 to a predetermined low frequency to control the closing of the second and third on-off valves 14 and 15. In this case, the contents are the same as the above control conditions.

Further, when the temperature value detected by the temperature sensor for detecting the temperature of the indoor heat exchanger 5 becomes equal to or higher than the set temperature stored in the control circuit, the valve closing control may be performed. .

That is, when the detected temperature of the indoor heat exchanger 5 becomes equal to or higher than the set temperature, the amount of warm air blown out from the blowout port 4 becomes extremely large, and this buoyancy becomes large and the warm air is concentrated at a position separated from the floor surface. , I feel cold at my feet.
Therefore, the first on-off valve 13 is closed to obtain the warm air depressing action by the raw air as described above.

In any case, each on-off valve 13 to 15
It is advisable to adjust the rotation of the louver 4a provided at the outlet 4 to an appropriate angle in a state in which all are opened and a state in which the first opening / closing valve 13 is closed. Needless to say, it is more effective to control the rotation speed of the blower fan 6 in each state.

At least the first to third on-off valves 13 to 15 must be arranged so as to be located upstream of the heat exchange air with respect to the indoor heat exchanger 5. Specifically, as shown in FIG. 4 (A), the space Sa between the upper surface suction port 3 provided in the unit main body 1 and the rear heat exchanger 5B constituting the indoor heat exchanger 5 is It is on the upstream side of the heat exchange air with respect to the rear heat exchanger 5B.

The first to third on-off valves 13 to 15 are arranged in the space Sa and the necessary pipe connections are made. If there is a margin, it is possible to arrange the branch pipes 10 ..., the branch unit 11 and the merging port 12 without any problem.

In particular, in the same way that the drain adheres to the indoor heat exchanger 5 during the cooling operation, the drain often adheres to the on-off valves 13 to 15. With such an arrangement, even if the drain attached to each of the on-off valves 13 to 15 becomes large and drips, the flow of the heat-exchanged air gets on the rear-side heat exchanger 5B. .

Then, together with the drain adhering to the indoor heat exchanger 5, it flows down into the drain pan, and the waste water is treated. At least, the air will not be blown out from the outlet 4 into the air-conditioned room together with the heat exchange air, so that comfortable air conditioning will not be impaired.

For the same reason, the on-off valves 13 to 15 may be arranged in the space Sb between the upper part of the front inlet 2 and the upper part of the front heat exchanger 5A, as shown in FIG. . Since this is also the upstream side of the heat exchange air, even if the drain is attached to each of the on-off valves 13 to 15, the drainage mechanism of the indoor heat exchanger 5 will carry out the drainage treatment.

In the above embodiment, the branch pipes 10 connected to the branch unit 11 are provided with the first to third on-off valves 13 to 15. However, the present invention is not limited to this, and the merging port body is not limited to this. The on-off valves may be provided in the branch pipes 10 connected to 12, or may be provided in the branch pipes on both sides thereof.

Further, although the two refrigerant passages 7 and 8 are provided in the front heat exchanger 5A and the one refrigerant passage 9 is provided in the rear heat exchanger 5B, the present invention is not limited to this. The heat exchangers 5A and 5B may be provided with subdivided refrigerant passages, and some of them may be connected to the front and rear heat exchangers 5A and 5B.
It may be a refrigerant passage extending over 5B.

[0082]

As described above, according to the first aspect of the present invention, a plurality of refrigerant passages provided in the indoor heat exchanger are opened and closed under predetermined conditions of cooling and heating operation to form a non-heat exchange section. Since the fresh air is blown out and blown out in a state of overlapping with cold air or warm air that has exchanged heat with other parts, it controls opening and closing of the refrigerant passage without changing the basic structural form of the indoor heat exchanger. By simply performing the above, it is possible to improve the cooling efficiency and the heating efficiency particularly during stable operation, and to maintain comfortable air conditioning and achieve energy saving operation.

According to the second aspect of the invention, the plurality of front side refrigerant passages provided in the front side heat exchanger forming the inverted V-shaped indoor heat exchanger and the rear side refrigerant passage provided in the rear side heat exchanger are provided. The passage is opened and closed under the specified conditions of air-conditioning operation, a non-heat exchange part is created in the front heat exchanger part or the rear heat exchanger to let the fresh air pass, and it is superposed with the heat exchanged air with other parts. Since the indoor heat exchanger has an inverted V shape because it is blown out in the state, the temperature difference between the cool air and the warm air and the raw air can be made larger, and particularly the cooling efficiency and the heating during the stable operation can be achieved. It is possible to improve efficiency, maintain comfortable air conditioning, and achieve energy-saving operation.

[Brief description of drawings]

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

FIG. 2A is a diagram for explaining on-off valve control and heat exchange action during cooling operation. (B) is a figure explaining a heat exchange action at the time of cooling operation.

FIG. 3 (A) is a diagram for explaining on-off valve control and heat exchange action during heating operation. (B) is a figure explaining a heat exchange action at the time of heating operation.

FIG. 4A is a diagram for explaining the setting of the opening / closing valve.
(B) is a figure explaining other arrangement | positioning setting of an on-off valve.

[Explanation of symbols]

16 ... Compressor, 18 ... Outdoor heat exchanger, 19 ... Pressure reduction device (electric expansion valve), 5 ... Indoor heat exchanger, 2 ... Front inlet port, 3 ... Top inlet port, A ... Indoor unit, 5A ... Front side Heat exchanger, 5B ... Rear heat exchanger, 7 ... Front lower refrigerant conduction path (first conduction path), 8 ... Front upper refrigerant conduction path (second conduction path), 9 ... Rear refrigerant conduction path (third) Conducting path), 13 ... 1st
On-off valve, 14 ... second on-off valve, 15 ... third on-off valve.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location F24F 13/30 11/02 102 F

Claims (11)

[Claims] 1. An air conditioner that constitutes a heat pump type refrigeration cycle by sequentially connecting a compressor, a four-way valve, an outdoor heat exchanger, a decompression device and an indoor heat exchanger through a refrigerant pipe. A plurality of refrigerant passages that are provided separately in the indoor heat exchanger along the vertical direction and perform independent heat exchange action in the upper and lower parts of the indoor heat exchanger, and are provided in the respective refrigerant passages for cooling and heating operation, etc. And an opening / closing valve that opens and closes under a predetermined operating condition of 1. 2. An indoor unit having front and top suction ports, a front heat exchanger disposed inside the indoor unit and facing the front suction port, and a rear heat exchanger facing the top suction port. The heat exchanger is divided into a substantially V-shaped indoor heat exchanger and the front heat exchanger, and the heat exchanger is divided along the vertical direction. The upper and lower parts of the heat exchanger have independent heat exchange functions. A plurality of front side refrigerant conduction paths, a rear side refrigerant conduction path which is provided in the rear side heat exchanger and performs heat exchange action independently of the front side refrigerant conduction path, the front side refrigerant conduction path and the rear side refrigerant conduction path. An air conditioner, comprising: an opening / closing valve that is provided in each of the passages and that opens and closes under predetermined operating conditions such as cooling and heating operations. 3. An on-off valve provided in the refrigerant passage of the indoor heat exchanger or in the refrigerant passage of the front heat exchanger and the refrigerant passage of the rear heat exchanger constituting the indoor heat exchanger,
The air conditioner according to any one of claims 1 and 2, wherein the air conditioner is closed during a cooling operation so as not to perform a heat exchange action in each heat exchanger part. 4. An on-off valve provided in the refrigerant passage of the lower part of the indoor heat exchanger or the refrigerant passage of the lower part of the front side heat exchanger constituting the indoor heat exchanger is closed during heating operation, and each heat exchange is performed. The air conditioner according to any one of claims 1 and 2, characterized in that heat exchange is not performed in a vessel part. 5. The air conditioner according to claim 1, wherein the opening / closing control of each of the opening / closing valves is performed after a lapse of a predetermined time from the start of operation. 6. The air conditioner according to claim 1, wherein the opening / closing control of each of the opening / closing valves is performed when the operating frequency is equal to or lower than a predetermined value. 7. The air conditioner according to claim 1, wherein the opening / closing control of each of the opening / closing valves is performed when the indoor heat exchanger temperature is equal to or higher than a predetermined temperature. Machine. 8. The air conditioner according to claim 1, wherein the opening / closing control of each of the on-off valves is performed when the indoor heat exchanger temperature is equal to or lower than a predetermined temperature. Machine. 9. The air conditioner according to claim 2, wherein each of the on-off valves is arranged on the windward side of the indoor heat exchanger. 10. The air conditioner according to claim 9, wherein each of the on-off valves is arranged between a front heat exchanger constituting the indoor heat exchanger and a front suction port. 11. The air conditioner according to claim 9, wherein each of the on-off valves is arranged between a rear heat exchanger that constitutes the indoor heat exchanger and an upper surface intake port.