JP2001065950A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize the flow rate of refrigerant of each heat exchanger and improve operation efficiencies. SOLUTION: The air conditioner comprises a first and second heat exchangers 3, 4 which are parallelly connected to each other with respect to a refrigerant circuit and a first and second flow-dividing motor-operated valves 26, 27 to control feeding refrigerant to each heat exchanger. Further, there are provided a first and second heat exchanger temperature sensors 36, 37 to sense temperatures of the heat exchangers 3, 4 respectively, outlet temperature sensors 38, 39 to sense refrigerant outlet temperatures of the exchangers 3, 4 respectively, and a controller to control the opening of each of the motor-operated valves 26, 27. The controller monitors the deviation between the temperature sensed by the sensor 36 and the temperature sensed the sensor 38 and monitors the deviation between the temperature sensed by the sensor 37 and the temperature sensed by the sensor 39 to determine the opening of each of the motor-operated valves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for air-conditioning by blowing air exchanged with a heat exchanger into a room to be conditioned.

[0002]

2. Description of the Related Art A conventional air conditioner of this type is disclosed, for example, in Japanese Patent Application Laid-Open No. 10-122592 as a ceiling-mounted air conditioner. That is, in this case, the unit (indoor unit) of the air conditioner is housed inside the ceiling in the conditioned room, and a heat exchanger and a blower are mounted in this unit.

[0003] This heat exchanger forms a predetermined refrigerant circuit with a unit (outdoor unit) installed outdoors, and has a cooling / heating unit.
Exhibits a heating effect. Then, the air in the conditioned room is sucked by a blower to exchange heat with the heat exchanger, and then blown out from the outlet into the conditioned room to perform air conditioning.

[0004]

By the way, in recent years, a plurality of (for example, two) heat exchangers (use-side heat exchangers) are arranged in an indoor unit, and each heat exchanger is connected in parallel to a refrigerant circuit. A type has been developed in which a refrigerant is separately supplied, and air that has exchanged heat with each heat exchanger is blown out from an outlet through a corresponding blower (two units are installed) into a conditioned room.

[0005] In this air conditioner, the refrigerant flowing into each heat exchanger passes through the refrigerant outlet after exchanging heat, so that the temperature of the heat exchanger itself and the temperature of the refrigerant outlet are different. It is considered that the larger the difference (deviation) is, the more the refrigerant flow rate is insufficient, and the smaller the difference, the more the refrigerant flow rate is sufficient.

[0006] Therefore, when the difference between the temperature of each heat exchanger and the deviation of each refrigerant outlet is different, the branch of the refrigerant is biased. When such a deviation of the refrigerant branch occurs, the heat exchanger freezes during the cooling operation and a high-load operation occurs during the heating operation, resulting in a problem that the operation efficiency is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problems, and is intended to make the refrigerant flow rate of each heat exchanger uniform and to improve the operation efficiency. Machine.

[0008]

An air conditioner according to the present invention comprises:
It comprises a first and a second heat exchanger connected in parallel to the refrigerant circuit, and a first and a second valve device for controlling the supply of the refrigerant to each heat exchanger, respectively. A first and a second heat exchange temperature sensor for detecting a temperature of each heat exchanger, an outlet temperature sensor for detecting a temperature of a refrigerant outlet of each heat exchanger, and control for controlling an opening degree of each valve device. A control unit configured to control a deviation between a temperature detected by the first heat exchange temperature sensor and a temperature detected by the first outlet temperature sensor, and a temperature difference detected by the second heat exchange temperature sensor. 2 is characterized by monitoring the deviation of the temperature detected by the outlet temperature sensor and determining the opening of each valve device.

According to the present invention, the first and second heat exchangers are connected in parallel to the refrigerant circuit, and the first and second valves respectively control the supply of the refrigerant to each heat exchanger. In an air conditioner comprising a device, first and second heat exchange temperature sensors for detecting the temperature of each heat exchanger, an outlet temperature sensor for detecting the temperature of the refrigerant outlet of each heat exchanger, A control device for controlling an opening degree of the valve device, the control device comprising: a deviation between a temperature detected by the first heat exchange temperature sensor and a temperature detected by the first outlet temperature sensor; The difference between the temperature detected by the intersection temperature sensor and the temperature detected by the second outlet temperature sensor is monitored to determine the opening of each valve device. To increase the flow rate of the refrigerant to the heat exchanger, and Alternatively, the heat exchanger having the smaller deviation can reduce the degree of opening of the valve device and reduce the flow rate of the refrigerant to the heat exchanger, thereby realizing a uniform flow rate of the refrigerant in each heat exchanger. Become.

[0010] This makes it possible to prevent the freezing of the heat exchanger during the cooling operation and the high load operation during the heating operation, thereby improving the operation efficiency.

An air conditioner according to a second aspect of the present invention is the first aspect.
In addition to the invention of the first embodiment, first and second blowers for blowing air exchanged with the heat exchangers into the conditioned room, respectively, and the first and second blowers direct air toward different areas in the conditioned room. The first and second outlets for blowing air, the control device sets a priority for each area in the conditioned room, increases the rotation speed of the blower corresponding to the high priority area, and The opening degree of the valve device of the heat exchanger corresponding to the blower is enlarged.

According to the second aspect of the present invention, in addition to the above, the first and second blowers for blowing the air which has exchanged heat with each heat exchanger into the conditioned room, and the first and second blowers, First and second air outlets for blowing air toward different regions in the conditioned room, the control device sets a priority for each region in the conditioned room, and sets a priority in the region with a higher priority. Since the rotation speed of the corresponding blower is increased and the opening of the valve device of the heat exchanger corresponding to the blower is increased, the refrigerant flow rate of the heat exchanger with the increased rotation speed of the blower is increased. be able to.

[0013] Thus, for example, when the user is present only in a specific area in the conditioned room, the amount of air from the blower for blowing air into the area is increased, and the refrigerant flowing to the corresponding heat exchanger is increased. By increasing the flow rate, priority air conditioning can be performed. Therefore, it is possible to realize more comfortable and efficient air-conditioning operation for the user.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an air conditioner A to which the present invention is applied.
2 is a sectional view of the use side unit (indoor unit) A of C, FIG.
Is a refrigerant circuit diagram of the air conditioner AC, FIG. 3 is an electric circuit diagram of the use side unit A, and FIG. 7 shows the conditioned room 1 in which the use side unit A is installed.

In FIG. 1 and FIG. 7, the user side unit A
Are two use-side heat exchangers (indoor heat exchangers) 3 (first heat exchanger) and 4 (second heat exchanger) in a main body 2 made of sheet metal.
And two blowers 6 (first blower) and 7 (second blower) each including a cross-flow fan, and the inside of the ceiling is closed so as to close the ceiling surface 8 of the harmonized room 1. It is fitted in. A suction port 9 is formed at the center of the lower surface of the main body 2 which is substantially flush with the ceiling surface 8, and air outlets 11 (first air outlets) and 12 (second air outlets) are formed on both sides thereof. Is formed. A filter 10 is attached to the suction port 9.

The use side heat exchangers 3 and 4 have lower ends located on both sides of the suction port 9, respectively, and upper ends thereof have the suction port 9.
It is arranged so as to be close to the upper center of the
Blowers 6 and 7 are each use side heat exchangers 3 and 4 and each outlet 1
It is arranged between 1 and 12. When the blowers 6 and 7 are operated, the air in the conditioned room 1 is sucked from the suction port 9 and flows into the use-side heat exchangers 3 and 4.

The conditioned air that has flowed into the use side heat exchanger 3 and exchanged heat is accelerated by the blower 6 and
Is blown out into the harmonized room 1. The conditioned air that has flowed into the use-side heat exchanger 4 and exchanged heat is accelerated by the blower 7 and blown out of the outlet 12 into the conditioned room 1.

In this case, flaps 13 and 14 as wind direction plates are respectively attached to the air outlets 11 and 12, and the direction of the conditioned air is controlled by the angles of the flaps 13 and 14. User side unit A
An infrared receiver 16 from a remote controller, which will be described later, is attached to the lower surface of the device.

In the embodiment, the use side unit A is installed substantially at the center of the ceiling surface 8 of the harmonized room 1, and the zone (region) on the left side from the center of the harmonized room 1 indicated by a broken line in FIG. The outlet 11 is located in the living) Z1, and the outlet 12 is located in the right zone (area; dining, for example) Z2.
Is located.

Next, referring to FIG. 2, the air conditioner A of the embodiment will be described.
C comprises the ceiling-mounted use-side unit A installed indoors as described above, and the heat-source-side unit (outdoor unit) B installed outdoors, and both are connected by the refrigerant pipe 21.

In this figure, reference numeral 22 denotes a so-called inverter compressor (variable capacity type compressor, hereinafter referred to as a compressor) whose frequency is controlled by an inverter. As means for varying the capacity of the compressor, there are other methods such as voltage control when a DC motor is used or discharge amount control when a capacity variable valve is used. 23 is a four-way switching valve for switching the flow of the refrigerant during the cooling / heating operation, 24 is a heat source side heat exchanger (outdoor heat exchanger), 25 is an electric expansion valve, and 26 is a first electric expansion valve for diverting. Reference numeral 27 denotes a second electric flow expansion valve for diverting, reference numerals 3 and 4 denote the use side heat exchangers, and reference numeral 28 denotes an accumulator.

In this case, the use-side heat exchanger 3 is connected in series with the flow-dividing electric expansion valve 26, and the use-side heat exchanger 4 is connected in series with the flow-dividing electric expansion valve 27. The configuration is such that they are connected to each other in parallel. still,
The electric expansion valves 26 and 27 for diversion are controlled in opening degree by a control device described later.

In the above configuration, the direction of the refrigerant discharged from the compressor 22 is determined in accordance with three modes of a cooling operation, a heating operation and a dry operation in accordance with the switching position of the four-way switching valve 23.

That is, during the cooling operation, the high-temperature and high-pressure refrigerant discharged from the compressor 22 passes through the four-way switching valve 23, the heat source side heat exchanger 24, and the electric expansion valve 25, and is divided, and one of the refrigerants is used for electric distribution. The fluid flows through the expansion valve 26 to the use-side heat exchanger 3, and the other flows to the use-side heat exchanger 4 through the flow-dividing electric expansion valve 27. And the refrigerant | coolant which came out of each use side heat exchanger 3 and 4 joins, and circulates in the order of the four-way switching valve 23 and the accumulator 28. At this time, the heat source side heat exchanger 24 functions as a condenser, and the utilization side heat exchangers 3 and 4 function as evaporators.

Next, during the heating operation, the high-temperature and high-pressure refrigerant discharged from the compressor 22 exits the four-way switching valve 23,
One is flowed to the flow-dividing electric expansion valve 26 via the use-side heat exchanger 3, and the other is flowed to the flow-dividing electric expansion valve 27 via the use-side heat exchanger 4. Then, the electric expansion valve 25, the heat source side heat exchanger 24, the four-way switching valve 23, the accumulator 2
Cycle in the order of 8. At this time, each use side heat exchanger 3,
4 functions as a condenser, and the heat source side heat exchanger 24 functions as an evaporator.

Next, in FIG. 3, reference numeral 33 denotes a controller (control board) comprising a general-purpose microcomputer as a control device. A room temperature sensor 30, a first inlet temperature sensor (a first outlet temperature sensor during a heating operation) 34, and a second inlet temperature sensor (a second outlet temperature during a heating operation) attached to the use side unit A. , A first heat exchange temperature sensor 36, a second heat exchange temperature sensor 37, a first outlet temperature sensor 38, and a second outlet temperature sensor 39.

As shown in FIG. 2, the first inlet temperature sensor 34 is connected to a refrigerant inlet side of the use side heat exchanger 3 during the cooling operation (a refrigerant outlet side of the use side heat exchanger 3 during the heating operation). And the second inlet temperature sensor 35
Is also attached to a pipe which is a refrigerant inlet side of the use side heat exchanger 4 during the cooling operation (a refrigerant outlet side of the use side heat exchanger 4 during the heating operation). The first heat exchange temperature sensor 36 is attached to the use side heat exchanger 3, and the second heat exchange temperature sensor 37 is attached to the use side heat exchanger 4.

Further, the first outlet temperature sensor 38 is attached to a pipe on the refrigerant outlet side of the use side heat exchanger 3 during the cooling operation, and the second outlet temperature sensor 39 is also used during the cooling operation. It is attached to a pipe on the refrigerant outlet side of the side heat exchanger 4.

The controller 33 has flap motors 41, 4 comprising stepping motors for driving the flaps 13 and 14 to adjust the angle (wind direction).
2 is connected, and D for driving the blowers 6 and 7 is connected.
Fan motors 43 and 44 composed of C motors are connected,
Further, a sensor board 46 is also connected. This sensor substrate 4
6 is provided with the receiver 16, and also provided with lamps 46A to 46D made of LEDs.

Further, the controller 33 drives the flow-dividing electric expansion valves 26 and 27 to drive the respective use-side heat exchangers 3,
The valve motors 47 and 48, which are stepping motors for adjusting the flow rate (opening) of the refrigerant to 4, are also connected. The controller 33 is electrically connected to a control board (controller) (not shown) of the heat source side unit B from the terminal plate 49 via a cable.

Next, the operation of the air conditioner AC will be described while explaining the structures of the main remote controller 51 and the sub remote controller 52 used in the embodiment with reference to FIG. 4, FIG. 5, and FIG. The main remote controller 51 is made of a hard synthetic resin as shown in FIGS. 4 and 5, and a liquid crystal display unit 54 as a display unit is provided on an upper front part of a main body 53 thereof.

The main body 53 is covered with a cover 56 which can be freely opened and closed, and a part of the liquid crystal display section 54 is configured to be visible through a window hole 57 of the cover 56.
A temperature setting switch 58 and a run / stop switch 59 are attached below the window hole 57 of the cover 56, and a human sensor 61 composed of a Fresnel lens F and a pyroelectric sensor (not shown) is provided below the temperature setting switch 58 and the run / stop switch 59. Is attached.

A set temperature and the like are displayed on the liquid crystal display section 54, and the set temperature is indicated by the temperature setting switch 58.
Can be set up / down by the operation. Based on the operation of the run / stop switch 59, the controller 33
Starts and stops the air conditioner AC. Incidentally, reference numeral 62 denotes an infrared light emitting section provided at the upper end of the main body 54.

The controller 33 receives an infrared signal from the main remote controller 51 at the receiver 16 of the sensor board 46, and provides data such as a set temperature based on the received signal or the data on the use side unit A itself. Setting data by a switch or the like, a temperature sensor (room temperature sensor) provided inside the main remote controller 51, the room temperature sensor 30, and the temperature sensors 34 to 39.
The fan motor 4 of the blower 6 and the blower 7
In addition to controlling the operation (drive) of the flap motors 41 and 42 and the valve motors 47 and 48, the control signal is transmitted from the terminal plate 49 to the heat source side unit B to control the compressor 22 and the four-way switching valve 23. By controlling, the room temperature is adjusted to the set temperature.

Here, during normal operation, the controller 33 controls the use side heat exchangers 3 and 4 based on the outputs of the heat exchange temperature sensors 36 and 37, the outlet temperature sensors 38 and 39, and the inlet temperature sensors 34 and 35. Monitors temperature. During the cooling / drying operation, for example, a deviation e1 between the temperature detected by the heat exchange temperature sensor 36 and the temperature detected by the outlet temperature sensor 38 is large, and the temperature detected by the heat exchange temperature sensor 37 and the temperature detected by the outlet temperature sensor 39 are large. Is small, the controller 33 determines that the refrigerant flow rate of the use-side heat exchanger 3 is smaller than the refrigerant flow rate of the use-side heat exchanger 4, and that the branch flow has a large deviation.

In such a case, the controller 33 controls the valve motor 4
7, the opening degree of the flow-dividing electric expansion valve 26 is increased to increase the flow rate of the refrigerant to the heat exchanger 3, and the valve motor 48
Accordingly, the degree of opening of the electric expansion valve 27 for diversion is reduced, and the flow rate of the refrigerant to the heat exchanger 4 is reduced.

In this case, only the opening of the flow-dividing electric expansion valve 26 may be increased, or only the opening of the flow-dividing electric expansion valve 27 may be reduced.

By controlling the flow-dividing expansion valves 26 and 27, the flow rate of the refrigerant in the use-side heat exchanger 3 increases, and the flow rate of the refrigerant in the use-side heat exchanger 4 decreases. Thereby, the refrigerant flow rate of the use side heat exchanger 3 where the refrigerant flow rate is low increases, and the refrigerant flow rate of the use side heat exchanger 4 where the refrigerant flow rate is high is reduced. Exchangers 3, 4
Is made uniform.

Next, during the heating operation, for example, the deviation e3 between the temperature detected by the heat exchange temperature sensor 36 and the temperature detected by the inlet temperature sensor 34 (which is an outlet temperature sensor during the heating operation) is large. When the deviation e4 between the temperature detected by the 37 and the temperature detected by the inlet temperature sensor 35 (which is an outlet temperature sensor during the heating operation) is small, the controller 33 determines that the refrigerant flow rate of the use side heat exchanger 3 is It is determined that the refrigerant flow rate is smaller than the flow rate of the refrigerant in the vessel 4 and that the branch flow is largely offset.

In such a case, the controller 33 controls the valve motor 4
7, the opening degree of the flow-dividing electric expansion valve 26 is increased to increase the flow rate of the refrigerant to the heat exchanger 3, and the valve motor 48
Thereby, the opening degree of the second electric expansion valve 27 for diversion is reduced, and the flow rate of the refrigerant to the heat exchanger 4 is reduced.

It should be noted that, also in this case, the first electric expansion valve 2
6 may be increased, or only the opening of the second flow-dividing electric expansion valve 27 may be decreased.

By controlling the flow-dividing expansion valves 26 and 27, the flow rate of the refrigerant in the use-side heat exchanger 3 increases, and the flow rate of the refrigerant in the use-side heat exchanger 4 decreases. As a result, the refrigerant flow rate of the use-side heat exchanger 3 where the refrigerant flow rate is reduced increases, and the refrigerant flow rate of the use-side heat exchanger 4 where the refrigerant flow rate is increased is reduced. Exchangers 3, 4
The refrigerant flow rate is also made uniform.

On the other hand, various switches for setting the operating state of the air conditioner AC in detail are provided below the liquid crystal display section 54 on the front of the main body 53 of the main remote controller 51. In FIG. 5, reference numeral 63 denotes an operation changeover switch.
Is switched to the cooling operation, the heating operation, and the dry operation. The display of each operation state is performed on the liquid crystal display unit 54.

Reference numerals 64 and 66 denote wind direction switches for adjusting the angles of the flaps 13 and 14 by the flap motors 41 and 42, respectively. The setting is switched at three positions of “swing”. When the controller 33 is set to “automatic”, the flap 1
3 and 14 are controlled to an angle set in advance in accordance with each of the operating states. In “select”, the angle can be adjusted to a desired angle. Further, in the “swing”, the flaps 13 and 14 are automatically swung. This display is also displayed on the liquid crystal display unit 54.

Reference numeral 67 denotes a fan motor 4 of the blowers 6 and 7
An air volume switch for setting the air volume blown out of the air outlets 11 and 12 according to the number of rotations of 3, 44. The air volume switch 64 allows the air volume to be “automatic”, “strong”,
Can be switched to "weak". The amount of air is also displayed on the liquid crystal display unit 54. Reference numeral 68 denotes a zone switch for executing a zone control operation described later.
Further, reference numeral 69 denotes a switch group for setting a timer reservation operation.

The main remote controller 5 having such a configuration
Numeral 1 is attached to the wall surface of the zone Z1 of the to-be-harmed room 1 (FIG. 7), and transmits data of a temperature sensor incorporated therein and data of each switch to the receiver 16 of the use side unit A by infrared rays.

The human sensor 61 detects a human body movement in the zone Z1 of the room 1 to be conditioned. The main remote controller 51 similarly transmits the detection data of the motion sensor 61 to the receiver 16 by infrared rays.

On the other hand, the sub remote controller 52 is made of a hard synthetic resin as shown in FIG. 6, and the front thereof has a human sensor 71 having the same structure as described above and whether or not the sub remote controller 52 is used. An on / off switch 72 for setting is provided, and an infrared light emitting section 73 is provided at the upper end thereof.

The sub remote controller 52 having such a configuration
Is attached to the wall surface of the zone Z2 of the conditioned room 1 (FIG. 7). The human sensor 71 is located in the zone Z of the harmonized room 1.
2, the sub remote controller 52 transmits the detection data of the human sensor 71 to the receiver 16 by infrared rays.

Here, the receiver 16 has two built-in receiving sections, each of which is directed toward the main remote controller 51 and the sub remote controller 52. Then, the controller 33 determines from which remote controller the data is from the difference in the infrared receiving sensitivity.

It should be noted that the present invention is not limited to such a configuration, and one receiving unit may be operated by a stepping motor, and a remote controller may be identified based on a difference in receiving sensitivity.

Next, the zone control operation performed when the zone switch 68 is operated will be described.
By operating the zone switch 68, the zone control operation is executed by the controller 33 in three positions of "zone 1", "zone 2", and "automatic".

Then, when "zone 1" is set,
The controller 33 sets the priority of the air conditioning in the zone Z1 to be high, and the fan motor 43 of the blower 6 operates at a high speed (H) while the fan motor 44 of the blower 7 has a low speed (L). Further, the degree of opening of the flow-dividing electric expansion valve 26 is increased. At this time, the diverting electric expansion valve 27
May be made smaller. Thereby, the conditioned air is mainly blown out preferentially from the outlet 11 toward the zone Z1 of the conditioned room 1, and the flow rate of the refrigerant to the heat exchanger 3 is increased, so that the zone 1 (living) Only when a user exists, comfortable and efficient air-conditioning of the zone Z1 becomes possible.

When the zone is set to “zone 2”, the controller 33 sets the priority of the air conditioning in the zone Z2 to high,
The fan motor 44 of the blower 7 operates at a high speed (H), and the fan motor 43 of the blower 6 has a low speed (L). In addition, the degree of opening of the flow-dividing electric expansion valve 27 is increased. At this time, the degree of opening of the flow-dividing electric expansion valve 26 may be reduced. As a result, the conditioned air is mainly blown out from the outlet 12 toward the zone Z2 of the conditioned room 1, and the flow rate of the refrigerant to the heat exchanger 4 is increased, so that the conditioned air is used only in the zone Z2 (kitchen). When people are present, comfortable and efficient air conditioning can be performed.

Further, when "automatic" is set, the controller 33 operates the respective zones Z1, Z2 by detecting the motion sensors 61, 71 of the remote controllers 51, 52.
The priority of the second air conditioner is determined. That is, the motion sensor 61 of the main remote controller 51 detects a human body motion, and the motion sensor 71 of the sub remote controller 52
When the human body motion is not detected, the priority of the air conditioning in the zone Z1 is increased.

Conversely, if the motion sensor 61 of the main remote controller 51 does not detect a human motion and the motion sensor 71 of the sub remote controller 52 detects a human motion, the air conditioning in the zone Z2 is performed. Higher priority.

Then, both remote controllers 5
When the human motion sensors 61 and 71 of 1 and 52 are detecting a human body motion, no priority is set.

Thus, when one user moves from the zone Z1 to the zone Z2 in the room 1 to be conditioned, air conditioning is automatically performed preferentially toward the zone where the user exists. As a result, the zone where the user is present can be preferentially air-conditioned without setting the zones one by one, and the operability is improved. In addition, when the user exists in both the zone Z1 and the zone Z2 of the harmonized room 1, the priority is automatically canceled, so that the comfort can be further improved.

In the embodiment, the main remote controller 51 is provided with the human sensor 61. However, the present invention is not limited to this, and a configuration may be adopted in which only the sub remote controller 52 is provided with the human sensor 71. In that case, in the "automatic" position, normally, the zone Z1 is preferentially air-conditioned, and when the human sensor 71 of the sub remote controller 52 detects a human body operation, the preferential air-conditioning is released to release the conditioned room. 1 may be switched to the entire air conditioning, or may be switched to the priority air conditioning in the zone Z2.

In the embodiment, the case where two use-side heat exchangers and blowers are provided has been described. However, the present invention is not limited to this, and the present invention is applicable to a case where more use-side heat exchangers and blowers are provided. It is valid.

[0061]

As described above, according to the present invention, the first and second heat exchangers connected in parallel to the refrigerant circuit and the supply of the refrigerant to each heat exchanger are controlled. In an air conditioner including first and second valve devices,
First and second heat exchange temperature sensors for detecting the temperature of each heat exchanger, an outlet temperature sensor for detecting the temperature of the refrigerant outlet of each heat exchanger, and a control device for controlling the opening of each valve device The control device includes: a deviation between a temperature detected by the first heat exchange temperature sensor and a temperature detected by the first outlet temperature sensor; and a temperature difference detected by the second heat exchange temperature sensor and a second deviation. The deviation of the temperature detected by the outlet temperature sensor is monitored to determine the degree of opening of each valve device, so that, for example, the heat exchanger with the larger deviation increases the degree of opening of the valve device to increase the heat exchange. The flow rate of refrigerant to each heat exchanger is increased by increasing the flow rate of refrigerant to the heat exchanger and / or decreasing the degree of opening of the valve device to reduce the flow rate of refrigerant to the heat exchangers. Can be realized.

Thus, it is possible to prevent the freezing of the heat exchanger during the cooling operation and the high load operation during the heating operation, thereby improving the operation efficiency.

According to the second aspect of the present invention, in addition to the above, the first and second blowers for blowing the air which has exchanged heat with each heat exchanger into the conditioned room, and the first and second blowers are used. First and second air outlets for blowing air toward different regions in the conditioned room, the control device sets a priority for each region in the conditioned room, and sets a priority in the region with a higher priority. Since the rotation speed of the corresponding blower is increased and the opening of the valve device of the heat exchanger corresponding to the blower is increased, the refrigerant flow rate of the heat exchanger with the increased rotation speed of the blower is increased. be able to.

Thus, for example, when a user is present only in a specific area in the conditioned room, the amount of air from the blower for blowing air into the area is increased, and the corresponding refrigerant is supplied to the heat exchanger. By increasing the flow rate, priority air conditioning can be performed. Therefore, it is possible to realize more comfortable and efficient air-conditioning operation for the user.

[Brief description of the drawings]

FIG. 1 is a sectional view of a use side unit of an air conditioner of the present invention.

FIG. 2 is a refrigerant circuit diagram of the air conditioner of the present invention.

FIG. 3 is an electric circuit diagram of a use side unit of the air conditioner of the present invention.

FIG. 4 is a front view of a main remote controller of the air conditioner of the present invention.

FIG. 5 is a front view of the main controller of FIG. 4 with a cover removed.

FIG. 6 is a front view of a sub remote controller of the air conditioner of the present invention.

FIG. 7 is a diagram showing a conditioned room to which a use side unit of the air conditioner of the present invention is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Harmonized room 3, 4 Use side heat exchanger 6, 7 Blower 9 Suction port 11, 12 Outlet 22 Compressor 24 Heat source side heat exchanger 26, 27 Electric expansion valve for branch flow 33 Controller 34, 35 Inlet temperature sensor 36 , 37 Heat exchange temperature sensor 38, 39 Outlet temperature sensor 43, 44 Fan motor 46 Sensor board 47, 48 Valve motor 51 Main remote controller 52 Sub remote controller 61, 71 Human sensor A User side unit AC air conditioner B Heat source side Unit F Fresnel lens Z1, Z2 zone

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Hatofo 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 3L060 AA03 AA06 CC04 DD02 EE05 EE09 3L061 BE02 BF04

Claims (2)

[Claims] A first and a second heat exchanger connected in parallel to a refrigerant circuit; and a first and a second valve device for controlling a supply of the refrigerant to each of the heat exchangers. In the air conditioner comprising: first and second detecting the temperature of each heat exchanger respectively
A heat exchange temperature sensor, an outlet temperature sensor for detecting a temperature of a refrigerant outlet of each of the heat exchangers, and a control device for controlling an opening degree of each of the valve devices. The deviation between the temperature detected by the heat exchange temperature sensor and the temperature detected by the first outlet temperature sensor, and the deviation between the temperature detected by the second heat exchange temperature sensor and the temperature detected by the second exit temperature sensor are monitored. An air conditioner for determining an opening of each of the valve devices. 2. A first and a second blower for blowing air exchanged with each heat exchanger into a conditioned room, respectively, and the first and second blowers respectively toward different areas in the conditioned room. First and second for blowing air
The control device sets a priority for each area in the conditioned room, increases the rotation speed of the blower corresponding to the high priority area, and sets the heat exchanger corresponding to the blower. The air conditioner according to claim 1, wherein the opening of the valve device is enlarged.