JP5794866B2 - Air conditioner indoor unit - Google Patents

Description

  The present invention relates to an indoor unit of an air conditioner in which a heat sink is mounted on a control device.

  As an indoor unit (use side unit) of a conventional air conditioner, a casing in which a use side heat exchanger is disposed, an intake port that is opened in the casing and into which indoor air is sucked, are also opened in the casing and are harmonized. An air outlet through which air is blown out, a main ventilation channel provided in the casing, air flows from the inlet to the outlet, and a use side heat exchanger is disposed between the inlet and the outlet; A fan provided in the casing and forming an air flow in the main ventilation flow path from the inlet to the outlet, and an electric component box provided in the casing and accommodating the electric component. At least a part of the box is provided in the main ventilation channel (see, for example, Patent Document 1).

JP 2010-261622 A (page 9, FIG. 3)

  However, in the indoor unit of the air conditioner described in Patent Document 1, a heat sink is often arranged on the back of the electrical component box, and when an electrical component box equipped with an inverter is to be installed on the front side of the fan, In order to avoid contact with the fan casing, there has been a problem that it is difficult to achieve compactness, for example, the depth of the main body must be increased.

  In addition, when conditioned air is blown out of the main body by two blowers, when an electrical component box is installed so that the heat sink is arranged on one side of the two blowers, the air heated by the heat dissipation of the heat sinks causes the two blowers to There was also a problem that the temperature of the conditioned air blown out was not uniform.

  Furthermore, an inverter or the like in which components are formed by Si (silicon) elements must sufficiently dissipate heat by a heat sink, and the heat sink must be arranged in an air passage through which air flows by a fan. There was also a point.

The present invention has been made to solve the above-described problems. The first object of the present invention is to reduce the size of a heat sink by applying a wide band gap semiconductor such as SiC (silicon carbide) to an element of an inverter drive circuit. And providing an indoor unit of an air conditioner that achieves downsizing of the entire indoor unit.
Moreover, the 2nd objective is to provide the indoor unit of the air conditioning apparatus which has arrange | positioned the heat sink between two air blowers.
And the 3rd objective is to provide the indoor unit of the air conditioning apparatus which can ensure heat resistance, without arrange | positioning in the wind path through which air flows with a fan.

The indoor unit of the air conditioner according to the present invention includes a main body in which an air inlet and an air outlet are formed, heat of refrigerant installed in the main body and flowing through the main body and air sucked from the air inlet. It is installed inside the main body at a predetermined interval from the user side heat exchanger that uses the air as conditioned air, and the user side heat exchange is performed by sucking air into the main body from the air suction port by its rotation. Two fans for ventilating the device, a motor installed inside the main body and rotating the fan, and a control device having an inverter drive circuit for driving the motor. The inverter drive circuit is a wide band gap semiconductor. A heat sink for mounting the formed element and dissipating heat generated from the element is provided, and the heat sink is installed so as to be exposed to the outside of the control device. Is disposed between the down, the fan and the control apparatus is arranged on the secondary side of the utilization side heat exchanger.

  According to the present invention, the heat resistance is improved by applying an element formed of a wide gap semiconductor to the inverter drive circuit, so that the heat sink can be reduced in size, and thus the heat sink can be interposed between the two fans. Since the size of the indoor unit in the depth direction can be reduced, the size of the indoor unit can be made compact.

It is plane sectional drawing of the indoor unit 101 of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is side surface sectional drawing of the indoor unit 101 of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a plane sectional view of indoor unit 101a of the air harmony device concerning Embodiment 2 of the present invention. It is side surface sectional drawing of the indoor unit 101a of the air conditioning apparatus which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
(Configuration of indoor unit 101)
FIG. 1 is a plan sectional view of an indoor unit 101 of an air-conditioning apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a side sectional view of the indoor unit 101. Hereinafter, the configuration of the indoor unit 101 of the air-conditioning apparatus according to the present embodiment will be described with reference to FIGS. 1 and 2. Here, the left-right direction of the main body 1 in the side view in FIG.

  As shown in FIGS. 1 and 2, the indoor unit 101 of the air conditioner according to the present embodiment includes a main body 1 serving as a casing of the indoor unit 101, and an air suction port 2 formed on one side surface of the main body 1. A use side heat exchanger 3 installed in the main body 1, two fans 4 arranged on the secondary side of the use side heat exchanger 3 (that is, the leeward side with respect to the use side heat exchanger 3), and An air outlet 5 is provided for blowing out the air blown from the fan 4 to the outside. In addition, the indoor unit 101 is arranged near the left side of the two fans 4 in the side view in FIG. 2 (the motor 6 that rotates the fan 4 (in the plan view in FIG. 1, near the back side of the two fans 4). ) And a heat sink 8 installed in the control device 7 so as to be disposed between the two fans 4. Furthermore, the indoor unit 101 includes a suction temperature detection unit 9 installed between the air suction port 2 and the use side heat exchanger 3, and a blowout temperature detection unit installed inside one of the two fans 4. 10 is provided.

  The air suction port 2 is formed on one side surface of the main body 1, and air is sucked into the main body 1 from the outside by the rotation operation of the fan 4 from the air suction port 2.

  The use-side heat exchanger 3 performs heat exchange between the refrigerant flowing through the inside and the air sucked from the air suction port 2 and functions as an evaporator in the present embodiment. In FIG. 1 and FIG. 2, components of the refrigeration cycle such as refrigerant pipes for allowing the refrigerant to flow into and out of the use side heat exchanger 3 are not shown.

The two fans 4 are, for example, sirocco fans, and are arranged on the secondary side of the use-side heat exchanger 3 with a predetermined distance from each other, and the arrangement direction of the two fans 4 is an opening surface of the air outlet 5 described later. It is installed so as to be substantially parallel. As the fan 4 rotates, air is sucked into the main body 1 from the air suction port 2 and is passed through the use side heat exchanger 3. Here, the fan 4 is formed with a fan suction port 4a that sucks air when rotating, and a fan blower port 4b that blows out the sucked air.
The fan 4 is a sirocco fan, but is not limited to this, and may be a propeller fan or a turbo fan.

The air outlet 5 is formed on the side surface of the main body 1 opposite to the side surface on which the air suction port 2 is formed, and heat is exchanged from the air outlet 5 by the use side heat exchanger 3. The conditioned air sucked in is blown out.
In addition, the formation position of the air blower outlet 5 is not limited to the opposing side surface of the air suction inlet 2, It is good also as what is formed in another position by the specification of the indoor unit 101. FIG.

  The motor 6 rotates the fan 4 to generate an air flow in the main body 1. A motor shaft 6a extends from the motor 6 and a rotating body of the fan 4 is connected to the motor shaft 6a. The rotational force of the motor 6 is transmitted to the rotating body of the fan 4 through the motor shaft 6a. Is done.

  The control device 7 is arranged in the vicinity of the left side of the two fans 4 in a side view in FIG. 2 and controls the entire indoor unit 101. An inverter drive circuit 7a for controlling the rotation of the motor 6 (see FIG. 2). ) Is built-in. The inverter drive circuit 7a is configured by mounting an electronic substrate on which an SiC element is applied to a power IC or the like, and the back surface of the substrate is used to dissipate heat generated from the SiC element or the like. A heat sink 8 is installed.

  As described above, the heat sink 8 is installed in the inverter drive circuit 7a of the control device 7, and is installed so as to be exposed to the outside of the control device 7. Moreover, the heat sink 8 is arrange | positioned between the two fans 4 as mentioned above, and is arrange | positioned so that it may be located between the utilization side heat exchanger 3 and the fan inlet 4a. The heat sink 8 radiates heat generated by a power IC or the like formed by the SiC element mounted on the inverter drive circuit 7a to the outside. It will be located in the path | route of the air which generate | occur | produces by rotation operation, ie, an air path, and can thermally radiate efficiently.

  The suction temperature detection means 9 is installed between the air suction port 2 and the use side heat exchanger 3 and detects the temperature of the air sucked from the air suction port 2, and is electrically connected to the control device 7. The temperature information is sent to. The blow-out temperature detection means 10 is installed inside one of the two fans 4 (left fan 4 in plan view in FIG. 1), is heat-exchanged by the use-side heat exchanger 3, and is supplied from the fan suction port 4a to the fan. 4 detects the temperature of the air (conditioned air) sucked into 4. Further, the blowing temperature detection means 10 is electrically connected to the control device 7 and transmits the detected temperature information to the control device 7.

  In the inverter drive circuit 7a, SiC is applied to a power IC or the like, but is not limited to this, and other wide band gap semiconductors (for example, GaN (gallium nitride) or diamond) are applied. It is good also as what to do.

(Operation of indoor unit 101)
Next, the operation of the indoor unit 101 of the air-conditioning apparatus according to the present embodiment will be described with reference to FIGS. 1 and 2.
First, the inverter drive circuit 7a of the control device 7 rotates the motor 6 by the drive signal and rotates the fan 4. Due to the rotation of the fan 4, external air flows into the main body 1 from the air suction port 2. The air that has flowed into the main body 1 from the air suction port 2 becomes conditioned air cooled by exchanging heat with the refrigerant flowing through the inside in the use-side heat exchanger 3 functioning as an evaporator. The conditioned air is heated by the heat sink 8 in contact with the heat sink 8 existing in the air path between the use side heat exchanger 3 and the fan 4. When viewed from the heat sink 8 side, the heat sink 8 radiates heat to the conditioned air, so that heat generated by the power IC formed by the SiC element mounted on the inverter drive circuit 7a is radiated. . The conditioned air is sucked into the fan 4 from the fan inlet 4a of the fan 4, blown out from the fan outlet 4b, and finally blown out from the air outlet 5. At this time, the conditioned air heated by the heat sink 8 is uniformly introduced into the two fans 4 because the heat sink 8 is disposed between the two fans 4.

  The suction temperature detection means 9 detects the temperature of the air sucked from the air suction port 2, and the blowout temperature detection means 10 is cooled by the use side heat exchanger 3 and sucked into the fan 4 from the fan suction port 4a. The temperature of the conditioned air thus detected is detected, and the detected temperature information is transmitted to the control device 7. The control device 7 controls the temperature of the conditioned air based on the received temperature information.

(Effect of Embodiment 1)
Since the heat resistance is improved by applying the SiC element to the power IC or the like of the inverter drive circuit 7a as in the above configuration, the heat sink 8 can be reduced in size. Since the size of the indoor unit 101 in the depth direction can be reduced, the size of the indoor unit 101 can be made compact.

  Further, since the heat sink 8 can be reduced in size, the pressure loss due to the heat sink 8 can be reduced even if the heat sink 8 is installed in the air path.

  Moreover, since the heat sink 8 can be disposed between the two fans 4, the conditioned air heated by the heat sink 8 can be uniformly introduced into the two fans 4, and the conditioned air blown out from the air outlet 5. The temperature of the air can be made uniform.

  Furthermore, since the conditioned air heated by the heat sink 8 uniformly flows into the two fans 4, it is not necessary to install the blowing temperature detecting means 10 on both of the two fans 4, and by installing only one of the fans 4. The temperature of the conditioned air can be controlled by the control device 7.

  In addition, in this Embodiment, although it is set as the structure which arrange | positions the fan 4 and the control apparatus 7 in the secondary side of the utilization side heat exchanger 3, it is not limited to this. That is, the fan 4 and the control device 7 may be disposed on the primary side of the use side heat exchanger 3. In this case, the heat sink 8 may be disposed between the two fans 4 so as to be positioned between the air suction port 2 and the fan suction port 4a. With this configuration, in addition to obtaining the above effects, heat can be dissipated from the heat sink 8 by the air before heat exchange is performed by the use side heat exchanger 3, so that the use side heat exchanger 3 is also condensed as an evaporator. It can also be used as a container. In the case of this configuration, the suction temperature detecting means 9 may be installed inside one of the two fans 4, and the blowout temperature detecting means 10 is connected to the use side heat exchanger 3, the air outlet 5, and the like. It should just be installed between.

Embodiment 2. FIG.
Next, the indoor unit of the air-conditioning apparatus according to the present embodiment will be described focusing on differences from the indoor unit of the air-conditioning apparatus according to Embodiment 1.

(Configuration of indoor unit 101a)
FIG. 3 is a plan sectional view of the indoor unit 101a of the air-conditioning apparatus according to Embodiment 2 of the present invention, and FIG. 4 is a side sectional view of the indoor unit 101a. Hereinafter, the configuration of the indoor unit 101a of the air-conditioning apparatus according to the present embodiment will be described with reference to FIGS. Here, let the left-right direction of the main body 1 be a depth direction in the side view in FIG.

  As shown in FIGS. 3 and 4, in the indoor unit 101a according to the present embodiment, the heat sink 8 is disposed between the two fans 4 and between the fan inlet 4a and the fan outlet 4b. It is placed in a dead space where the wind speed is low. Other configurations are the same as the configuration of the indoor unit 101 of the first embodiment.

(Operation of indoor unit 101a)
Next, the operation of the indoor unit 101a of the air-conditioning apparatus according to the present embodiment will be described with reference to FIGS.
First, the inverter drive circuit 7a of the control device 7 rotates the motor 6 by the drive signal and rotates the fan 4. Due to the rotation of the fan 4, external air flows into the main body 1 from the air suction port 2. The air that has flowed into the main body 1 from the air suction port 2 becomes conditioned air cooled by exchanging heat with the refrigerant flowing through the inside in the use-side heat exchanger 3 functioning as an evaporator. The conditioned air is sucked into the fan 4 from the fan suction port 4a of the fan 4, but the heat sink 8 is disposed in the dead space outside the air passage where the wind speed is low as described above. No heat is dissipated by the flow of conditioned air due to the rotational motion of 4. However, by reducing the size of the heat sink 8 by applying a SiC element to the power IC or the like of the inverter drive circuit 7a, the surface temperature of the heat sink 8 is increased, and the temperature difference from the surrounding air is increased, thereby increasing the heat sink. Even if the wind speed at the surface of 8 is small, it is possible to dissipate heat sufficiently. The conditioned air is sucked into the fan 4 from the fan inlet 4a of the fan 4, blown out from the fan outlet 4b, and finally blown out from the air outlet 5.

(Effect of Embodiment 2)
Even if the heat sink 8 is arranged in a dead space outside the air passage where the wind speed is low as in the above configuration, the surface temperature of the heat sink 8 is increased by reducing the size of the heat sink 8, and the temperature difference from the surrounding air Is increased, it is possible to sufficiently dissipate heat even if the wind speed on the surface of the heat sink 8 is low, the size of the indoor unit 101 in the depth direction can be reduced, and the size of the indoor unit 101 can be made compact. be able to.

  In addition, by arranging the heat sink 8 in a dead space outside the wind path where the wind speed is low, generation of turbulent flow due to collision of conditioned air with the heat sink 8 can be suppressed.

  In addition, in this Embodiment, although it is set as the structure which arrange | positions the fan 4 and the control apparatus 7 in the secondary side of the utilization side heat exchanger 3, it is not limited to this. That is, the fan 4 and the control device 7 may be disposed on the primary side of the use side heat exchanger 3. In this case, the heat sink 8 may be disposed between the two fans 4 and so as to be positioned between the fan inlet 4a and the fan outlet 4b. In this case, since most of the air sucked from the air suction port 2 is sucked into the fan 4 from the fan suction port 4a before colliding with the heat sink 8, the installation position of the heat sink 8 is an air path with a low wind speed. It becomes an outside dead space. With this configuration, in addition to obtaining the above effects, heat can be dissipated from the heat sink 8 by the air before heat exchange is performed by the use side heat exchanger 3, so that the use side heat exchanger 3 is also condensed as an evaporator. It can also be used as a container. In the case of this configuration, the suction temperature detecting means 9 may be installed inside one of the two fans 4, and the blowout temperature detecting means 10 is connected to the use side heat exchanger 3, the air outlet 5, and the like. It should just be installed between.

  As described above, in the case of the configuration in which the fan 4 and the control device 7 are arranged on the secondary side of the usage-side heat exchanger 3, the heat sink 8 of the indoor unit 101 of Embodiment 1 It arrange | positions so that it may be located between the fan inlet 4a, and about the indoor unit 101a of Embodiment 2, arrange | positions in the dead space where the wind speed between the fan inlet 4a and the fan outlet 4b is small It is said. Moreover, in the case of the structure which arrange | positions the fan 4 and the control apparatus 7 in the primary side of the utilization side heat exchanger 3, about the heat sink 8 of the indoor unit 101 of Embodiment 1, the air inlet 2 and the fan inlet 4a. And the heat sink 8 of the indoor unit 101a of the second embodiment is arranged so as to be positioned between the fan inlet 4a and the fan outlet 4b. Explained what was good. However, in this way, the heat sink 8 is disposed in the air passage as in the first embodiment, and in two dead spaces outside the air passage as in the second embodiment. The arrangement is not limited to the position. That is, on the assumption that the heat sink 8 is disposed between the two fans 4, for example, the heat sink 8 may be disposed at an intermediate position between the inside of the air passage and the outside of the air passage. If installed, the effect described in the first embodiment can be obtained, and if installed outside the air passage, the effect described in the second embodiment can be obtained.

  DESCRIPTION OF SYMBOLS 1 Main body, 2 Air inlet, 3 Use side heat exchanger, 4 Fan, 4a Fan inlet, 4b Fan outlet, 5 Air outlet, 6 Motor, 6a Motor shaft, 7 Controller, 7a Inverter drive circuit, 8 Heat sink, 9 suction temperature detection means, 10 blown temperature detection means, 101, 101a indoor unit.

Claims (9)

A main body formed with an air inlet and an air outlet;
A heat exchanger that is installed inside the main body, performs heat exchange between the refrigerant flowing through the inside and the air sucked from the air suction port, and uses the air as conditioned air;
Two fans installed inside the main body at a predetermined interval from each other, sucking air into the main body from the air inlet by rotation thereof, and passing the air to the use side heat exchanger;
A motor installed inside the main body and rotating the fan;
A control device comprising an inverter drive circuit for driving the motor;
With
The inverter drive circuit includes an element formed of a wide band gap semiconductor, and includes a heat sink that dissipates heat generated from the element.
The heat sink is disposed so as to be exposed to the outside of the control device, and is disposed between the two fans .
The fan and the control device are arranged on the secondary side of the use side heat exchanger . An indoor unit of an air conditioner. The fan includes a fan suction port that sucks air into the interior by rotation thereof,
The heat sink, the indoor unit of an air conditioner according to claim 1, characterized in that it is arranged so as to be located between said utilization side heat exchanger the fan inlet. The fan includes a fan suction port that sucks air into the interior thereof by rotation thereof, and a fan blowout port that blows out the sucked air to the outside of the fan,
The heat sink, the fan inlet and the indoor unit of an air conditioner according to claim 1, characterized in that it is arranged to be positioned between the fan outlet. Suction temperature detection means that is installed between the air suction port and the use side heat exchanger and detects the temperature of the air sucked from the air suction port;
An outlet temperature detecting means that is installed inside one of the two fans and detects the temperature of the conditioned air heat-exchanged by the use-side heat exchanger;
With
Wherein the control device, based on the temperature information detected by the suction temperature detecting means and the outlet temperature detecting means, any one of claims 1 to 3, characterized in that to implement the temperature control of the conditioned air The indoor unit of the air conditioning apparatus according to one item. A main body formed with an air inlet and an air outlet;
A heat exchanger that is installed inside the main body, performs heat exchange between the refrigerant flowing through the inside and the air sucked from the air suction port, and uses the air as conditioned air;
Two fans installed inside the main body at a predetermined interval from each other, sucking air into the main body from the air inlet by rotation thereof, and passing the air to the use side heat exchanger;
A motor installed inside the main body and rotating the fan;
A control device comprising an inverter drive circuit for driving the motor;
With
The inverter drive circuit includes an element formed of a wide band gap semiconductor, and includes a heat sink that dissipates heat generated from the element.
The heat sink is disposed so as to be exposed to the outside of the control device, and is disposed between the two fans.
The fan and the control device are arranged on a primary side of the use side heat exchanger,
The fan includes a fan suction port that sucks air into the interior by rotation thereof,
The indoor unit of an air conditioner , wherein the heat sink is disposed so as to be positioned between the air suction port and the fan suction port . A main body formed with an air inlet and an air outlet;
A heat exchanger that is installed inside the main body, performs heat exchange between the refrigerant flowing through the inside and the air sucked from the air suction port, and uses the air as conditioned air;
Two fans installed inside the main body at a predetermined interval from each other, sucking air into the main body from the air inlet by rotation thereof, and passing the air to the use side heat exchanger;
A motor installed inside the main body and rotating the fan;
A control device comprising an inverter drive circuit for driving the motor;
With
The inverter drive circuit includes an element formed of a wide band gap semiconductor, and includes a heat sink that dissipates heat generated from the element.
The heat sink is disposed so as to be exposed to the outside of the control device, and is disposed between the two fans.
The fan and the control device are arranged on a primary side of the use side heat exchanger,
Suction temperature detecting means installed inside one of the two fans and detecting the temperature of the air sucked from the air suction port;
An outlet temperature detecting means that is installed between the use side heat exchanger and the air outlet and detects the temperature of the conditioned air heat-exchanged by the use side heat exchanger;
With
The indoor unit of an air conditioner , wherein the control device performs temperature control of the conditioned air based on temperature information detected by the suction temperature detection means and the blowout temperature detection means . The fan includes a fan suction port that sucks air into the interior by rotation thereof,
The indoor unit of an air conditioner according to claim 6 , wherein the heat sink is disposed so as to be positioned between the air suction port and the fan suction port. The fan includes a fan suction port that sucks air into the interior thereof by rotation thereof, and a fan blowout port that blows out the sucked air to the outside of the fan,
The indoor unit of an air conditioner according to claim 6 , wherein the heat sink is disposed so as to be positioned between the fan inlet and the fan outlet. The indoor unit of the air conditioner according to any one of claims 1 to 8 , wherein the wide band gap semiconductor is SiC (silicon carbide), GaN (gallium nitride), or diamond.

Images