JP2006118793A - Electronic control device for water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently cool a mounted circuit board in an electronic control device applied to a heat pump type water heater. <P>SOLUTION: The electronic control device 13 has the mounted circuit board 30 stored in a casing 20, and the mounted circuit board 30 is formed by mounting a control circuit for controlling a compressor 1 and the rotation speed of a pump 7 on a substrate 25. The casing 20 is provided with an introduction port 21 and a discharge port 22. Cooling air by an electric fan 6 from the introduction port 21 is introduced into the casing 20, and discharged from the discharge port 22. The introduction port 21 and the discharge port 22 are arranged so that the cooling air passes near a power element 26, an IC 23, and a resistance element 24 constituting the control circuit. The power element 26, the IC 23, and the resistance element 24 can be cooled efficiently by the cooling air. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic control device for a hot water supply device applied to a heat pump type hot water supply device.

  Conventionally, a cooling device that cools an electronic control device for an electric vehicle with cooling air blown from a fan has been proposed (see, for example, Patent Document 1).

On the other hand, some electronic control devices for hot water supply devices are cooled by cooling air blown from a fan. In particular, in an electronic control device for a hot water supply device, when a mounted circuit board on which a control circuit is mounted has a power element (that is, a power semiconductor element), a large amount of heat is generated by the power element. In addition, cooling fins are equipped with power elements to support cooling.
Japanese Patent No. 0340161

  By the way, in the above-described electronic control device for a hot water supply apparatus, the mounted circuit board includes a large number of electronic components in addition to the power elements, and these large number of electronic components also generate heat. For this reason, the cooling air blown from the fan may not have sufficient cooling capacity, and in addition, it may be necessary to cool a large number of these electronic components.

  An object of this invention is to provide the electronic controller for hot water supply apparatuses which cools the mounted circuit board in an electronic controller efficiently in view of the said point.

In order to achieve the above object, according to the first aspect of the present invention, in an electronic control device applied to a heat pump hot water supply device,
A casing (20);
A mounted circuit board (30), which is housed in the casing and on which a control circuit for controlling the hot water supply circuit is mounted,
The casing is
An introduction hole (21) through which cooling air for cooling the mounted circuit board is introduced into the casing;
And a discharge hole (22) for discharging the cooling air introduced from the introduction hole to the outside of the casing.

  Therefore, since the cooling air is taken into the casing, the mounted circuit board can be efficiently cooled by the cooling air.

  According to a second aspect of the present invention, in the electronic controller for a hot water supply device according to the first aspect, electronic components (23, 24) constituting the control circuit are mounted on the mounted circuit board. If the introduction hole and the discharge hole are arranged so that the cooling air passes in the vicinity of the electronic component, the electronic component can be efficiently cooled by the cooling air.

In the invention according to claim 3, a power element that constitutes the control circuit is mounted on the mounted circuit board in addition to the electronic component,
If the introduction hole and the discharge hole are arranged so that the cooling air passes in the vicinity of the power element, the power element can be efficiently cooled by the cooling air.

Further, as in the invention according to claim 4, the mounted circuit board is mounted with electronic components and power elements that constitute the control circuit,
If the introduction hole and the discharge hole are arranged so that the cooling air passes in the vicinity of both the electronic component and the power element, the electronic component and the power element can be efficiently cooled by the cooling air.

  In addition, as in the invention described in claim 5, in the electronic controller for hot water supply apparatus according to any one of claims 1 to 4, the vapor compression cycle used in the heat pump type hot water supply apparatus is supercritical. It may be activated in the area.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

  FIG. 1 shows a heat pump type hot water supply apparatus A to which the electronic control device for a hot water supply apparatus of the present invention is applied. A supercritical heat pump cycle using carbon dioxide as a refrigerant is used in the hot water supply apparatus of the present embodiment, and an outline of the hot water supply apparatus will be described below.

  That is, the hot water supply apparatus of the present embodiment includes a hot water supply unit A. In the hot water supply unit A, the compressor 1 is an electric compressor, and the water refrigerant heat exchanger 2 is a high temperature discharged from the compressor 1. It is a heater that exchanges heat between a high-pressure refrigerant and hot water supply water (hereinafter also referred to as water supply). The water-refrigerant heat exchanger 2 constitutes a water circulation type hot water supply circuit to which the feed water pressurized by the circulation pump 7 is supplied.

  The decompressor 3 is a decompressor that decompresses the refrigerant that has flowed out of the water-refrigerant heat exchanger 2, and this decompressor 3 is a fixed-throttle type with a fixed opening degree, like a capillary tube.

  The air heat exchanger 4 is a heat absorber (evaporator) that evaporates the refrigerant decompressed by the decompressor 3 and absorbs heat from the atmosphere. The air heat exchanger 4 receives cooling air from the electric fan 6. To be cooled.

  The accumulator 5 is an accumulator that separates the refrigerant flowing out of the heat absorber 4 into a liquid-phase refrigerant and a gas-phase refrigerant and flows out only the gas-phase refrigerant to the suction side of the compressor 1 and stores excess refrigerant in the cycle.

  Here, the sensor 8 is a pressure sensor (pressure detection means) that detects the refrigerant pressure on the refrigerant inlet side of the water refrigerant heat exchanger 2, and the sensor 9 detects the refrigerant pressure on the refrigerant outlet side of the water refrigerant heat exchanger 2. Pressure sensor (pressure detection means).

  The sensor 10 is a pressure sensor (pressure detection means) that detects the refrigerant pressure on the refrigerant inlet side of the air heat exchanger 4, and the sensor 11 is a pressure sensor (pressure detection means) that detects the refrigerant pressure on the inlet side of the compressor 1. ).

  The electronic control unit (ECU) 13 executes a program set in advance based on the detected values of the sensors 8 to 11 and a set temperature of a temperature setting panel (not shown) to control the rotation speeds of the compressor 1 and the pump 7. To do.

  Next, the structure of the electronic control unit 13 that is a feature of the present embodiment will be described with reference to FIGS. FIG. 3 is a view of the inside of the electronic control device 13 seen from the side, and FIG. 4 is a view of the electronic control device 13 seen from below. FIG. 4 shows the arrangement relationship between the electronic control unit 13 and the electric fan 6.

  As shown in FIG. 3, the electronic control device 13 includes a casing 20 and a mounted circuit board 30 accommodated in the casing 20, and the mounted circuit board 30 is the number of rotations of the compressor 1 and the pump 7. A control circuit for controlling the above is mounted on the substrate 25.

  Specifically, a power element (power semiconductor element) 26, an IC 23, a resistance element 24, and the like constituting a control circuit are mounted on the substrate 25, and the power element 26 is equipped with the cooling fin 14. The cooling fins 14 are exposed to the outside of the electronic control unit 13 as shown in FIGS. 4 and 5, and the cooling fins 14 are cooled by cooling air from the electric fan 6.

  On the other hand, in order to cool electronic components such as the IC 23 and the resistance element 24 other than the power element 26, the casing 20 is provided with an introduction hole 21 and a discharge hole 22. 6 is introduced and the cooling air is discharged from the discharge hole 22.

  Here, the introduction hole 21 and the discharge hole 22 are arranged so that the cooling air passes in the vicinity of the power element 26, the IC 23, the resistance element 24, and the like, and the power element 26, the IC 23, and the resistance element 24 are connected to the electric fan. The negative pressure by 6 can be used for efficient cooling.

  Moreover, in this embodiment, since the supercritical heat pump cycle which uses a carbon dioxide as a refrigerant | coolant is used for the hot water supply apparatus, compared with the heat pump cycle which uses a chlorofluorocarbon as a refrigerant | coolant, in the electric compressor 1, it is high as a high pressure side pressure. Increase the refrigerant pressure. For this reason, it is necessary to increase the driving force for driving the electric compressor 1, and a large current flows through the electric motor for driving the electric compressor 1. For example, when the power element 26 is an element that switches a current flowing through the electric motor of the electric compressor 1, a large amount of heat is generated from the power element 26. For this reason, it is preferable to provide the introduction hole 21 and the discharge hole 22 and cool the power element 26 and the like directly with cooling air as in this embodiment.

(Other embodiments)
In the above-described embodiment, the example using the pressure sensor that detects the refrigerant pressure is described as each of the sensors 8 to 11. However, the present invention is not limited thereto, and a temperature sensor that detects the refrigerant temperature may be used. . In addition, as the sensors 8 to 11, a pressure sensor and a temperature sensor may be used together, and the rotation speeds of the compressor 1 and the pump 7 may be controlled using detection values of the pressure sensor and the temperature sensor, respectively. .

It is a figure which shows the heat pump type hot water supply apparatus to which the electronic controller for hot water supply apparatuses of this invention was applied. It is a schematic diagram which shows the partial structure of the electronic control apparatus of FIG. It is a schematic diagram which shows the partial structure of the electronic control apparatus of FIG. It is a schematic diagram which shows the arrangement | positioning relationship of the electronic controller of FIG. 1, and a fan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Compressor, 7 ... Pump, 6 ... Electric fan, 13 ... Electronic control unit,
20 ... casing, 21 ... introduction hole, 22 ... discharge hole, 23 ... IC,
24 ... resistive element, 26 ... power element, 30 ... mounted circuit board.

Claims (5)

In an electronic control device applied to a heat pump type hot water supply device,
A casing (20);
A mounted circuit board (30), which is housed in the casing and on which a control circuit for controlling the hot water supply circuit is mounted,
The casing is
An introduction hole (21) through which cooling air for cooling the mounted circuit board is introduced into the casing;
An electronic control device for a hot water supply apparatus, comprising: a discharge hole (22) for discharging cooling air introduced from the introduction hole to the outside of the casing. Electronic components (23, 24) constituting the control circuit are mounted on the mounted circuit board,
The electronic control device for a hot water supply apparatus according to claim 1, wherein the introduction hole and the discharge hole are arranged so that the cooling air passes in the vicinity of the electronic component. In the mounted circuit board, a power element constituting the control circuit is mounted in addition to the electronic component,
The electronic control device for a hot water supply apparatus according to claim 1, wherein the introduction hole and the discharge hole are arranged so that the cooling air passes in the vicinity of the power element. In the mounted circuit board, electronic components and power elements constituting the control circuit are mounted,
2. The electronic control device for a hot water supply apparatus according to claim 1, wherein the introduction hole and the discharge hole are arranged so that the cooling air passes in the vicinity of both the electronic component and the power element. 5. The electronic control device for a hot water supply apparatus according to claim 1, wherein the vapor compression cycle used in the heat pump type hot water supply apparatus is operated in a supercritical region. 6.

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