JPH0451345Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a refrigerator in which a compressor, a compressor drive motor, and a condenser are arranged in a machine room, and the condenser is forcedly air-cooled by a fan. In particular, the present invention relates to a refrigerator that controls the temperature inside the refrigerator by controlling the frequency using an inverter power source as a power source for a compressor driving motor.

(b) Conventional technology In recent years, as a means to vary the capacity of the refrigeration cycle according to the load using a compressor for a refrigerant compressor and a motor for driving the compressor, an inverter power source has been used as a power source for the compressor driving motor. Inverter devices have been put into practical use, for example, to uniformly control the temperature inside the refrigerator.

The inverter device includes an inverter power generation section that serves as a power source for the motor, and an inverter control circuit such as a frequency control section, and requires measures against noise or heat, especially for the inverter circuit driven at high frequency. Among these, there is an inverter device in which heat countermeasures are taken, for example, in Japanese Unexamined Utility Model Publication No. 59-66390, in which heat from heat generating components is radiated to an external liquid.

(c) Problems to be solved by the invention This conventional technology requires a dedicated cooling means as a countermeasure against the heat of the heat-generating components, complicates the protection device, and does not provide noise countermeasures, so it is difficult to use high-frequency drive. The control device malfunctions due to the noise of the transistor module, resulting in the problem that accurate inverter control cannot be performed.

Therefore, the present invention aims to achieve efficient heat countermeasures and noise countermeasures in a refrigerator that performs inverter control.

(d) Means for solving the problem The present invention is based on a system in which a compressor for compressing refrigerant, a motor for driving the compressor, a condenser, and a fan for air cooling the condenser are arranged in a machine room, and the drive motor is installed in a machine room. In a refrigerator that controls the temperature inside the refrigerator by controlling the frequency using an inverter power source as a power source, first and second electrical components are arranged opposite to each other to form a suction ventilation path for an air cooling fan in front of a condenser. A box and one of the electrical equipment boxes house an inverter power generation circuit including heat-generating parts attached to the box and fixed to a heat sink exposed in the machine room, and the other electrical equipment box houses an
This invention solves the above problems by configuring a refrigerator that houses an inverter control circuit such as a frequency control section.

(e) Effect In the above configuration, the first and second electrical equipment boxes that form the suction ventilation path in front of the condenser are cooled by the rotation of the fan that forcedly cools the condenser. Indirectly cools the stored heat generating parts. Furthermore, since the second electrical box that houses the control circuits such as the frequency control section is located apart from the first electrical box that houses the inverter power generation circuit, noise generated from the inverter electrical generation circuit can be controlled. Malfunction of the circuit is prevented.

(F) Embodiment FIG. 1 is a top view of the main parts of the refrigerator of the present invention, FIG. 2 is a front view of the main parts, and FIG. Machine room 2 defined
A compressor 3 for compressing refrigerant including a compressor drive motor 3A, a condenser 4, and a condenser air cooling fan 5 are disposed between the compressor 3 and the condenser 4, respectively.
The power source of the drive motor 3A is frequency-controlled using an inverter power source to control the temperature of the storage chamber 6 at a constant level, and its electric circuit includes a waveform generating circuit and heat-generating electronic components, as shown in FIG. It is composed of an inverter power generation circuit 7 including a power drive circuit having a certain inverter IC, and an inverter control circuit 9 such as a frequency control circuit that generates a frequency control signal based on an internal temperature sensor 8.

Among these, the inverter power generation circuit 7 is housed in the first electrical equipment box 10, and at this time, the inverter IC 7A, which is a heat generating electronic component, is attached to the first electrical equipment box 10 and exposed to the machine room 2. It is fixed at 11. On the other hand, the control circuit 9
It is stored in the electrical equipment box 12.

Thus, the first and second electrical equipment boxes 10 and 12
is the suction ventilation passage 1 of the fan 5 in front of the condenser 4.
3, and in this case,
The first electrical equipment box 10 is arranged so that the heat sink 11 faces the ventilation path 13.

In the above configuration, when the condenser air cooling fan 5 rotates during cooling operation to forcefully air cool the condenser 4, the air passing through the ventilation path 13 causes the first and second electrical equipment boxes 10 and 12 to be cooled. In the embodiment, since the heat sink 11 faces the ventilation path 13, the heat sink 11 is directly cooled and the inverter is cooled.
The temperature rise of IC7A can be effectively suppressed. At the same time, an inverter driven at high frequency
Control circuit 9 caused by IC7A noise
It is also possible to prevent malfunctions.

In the embodiment, the heat sink 11 is placed facing the ventilation passage 13 for direct cooling, but since the ventilation passage 13 is formed by the first and second electrical equipment boxes 10 and 12, the heat sink Even if 11 is installed on another surface of the first electrical box 10, an indirect cooling effect of the heat sink 11 can be expected, and as a result, the inverter IC 7
A temperature rise can be suppressed.

(g) Effects of the invention As described above, the present invention houses the inverter power generation circuit including heat-generating parts in the first electrical box, and stores the inverter control circuit such as the frequency control section in the second box.
Since the first and second electrical boxes form a suction ventilation path in front of the condenser, the heat dissipation plate attached to the first electrical box and exposed inside the machine room The temperature rise of the fixed heat-generating parts is suppressed by the ventilation generated by the rotation of the condenser air-cooling fan, and the heat-generating parts can be protected, and the first and second electrical equipment boxes are spaced apart. This also makes it possible to prevent malfunctions of the control circuit caused by noise generated from the inverter power generation circuit.

[Brief explanation of the drawing]

Fig. 1 is a top view of the main parts of the refrigerator of the present invention, Fig. 2 is a front view of the main parts, Fig. 3 is a sectional view taken along line AA in Fig. 1, and Fig. 4 shows the configuration of the inverter device of the present invention. FIG. 2... Machine room, 3... Compressor, 3A... Compressor driving motor, 4... Condenser, 5... Condenser air cooling fan, 7... Inverter power generation circuit, 7A
...Inverter IC (heat generating component), 9...Control circuit, 10...First electrical equipment box, 11... Heat sink, 12... Second electrical equipment box, 13... Suction ventilation path.

Claims (1)

[Scope of utility model registration request] A compressor for refrigerant compression, a compressor drive motor, a condenser, and a condenser air cooling fan are installed in the external machine room, and the frequency is controlled using an inverter power source as a power source for the drive motor. Accordingly, in a refrigerator that performs internal temperature control, first and second electrical equipment boxes are arranged facing each other to form a suction ventilation path for an air cooling fan in front of the condenser, and one of the electrical equipment boxes has a The box houses an inverter power generation circuit including heat-generating parts fixed to a heat sink exposed inside the machine room, and the other side of the electrical box houses an inverter control circuit such as a frequency control section. A refrigerator featuring