JPH0451344Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention consists of two condensing units, each consisting of a compressor, a compressor drive motor, a condenser, a condenser air-cooling fan, etc., arranged side by side in a machine room. The present invention relates to a two-unit type refrigerator, and particularly relates to a refrigerator in which internal temperature is controlled by controlling frequency using an inverter power source as a power source for each compressor driving motor.

(b) Conventional technology In recent years, as a means of varying 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 is equipped with an inverter control circuit such as an inverter power generation section that serves as a power source for the motor, and a frequency control section, and is particularly equipped with an inverter circuit that drives at a high frequency, and is particularly designed for noise countermeasures or heat countermeasures for the inverter circuit that drives at a high frequency. Requires. Among these, there is an inverter device in which heat countermeasures are taken, for example, in Japanese Utility Model Application Laid-Open 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 includes a compressor, a compressor driving motor,
A refrigerator that controls the internal temperature by installing two condensing units, each consisting of a condenser and a condenser air-cooling fan, in parallel in the machine room, and controlling the frequency using an inverter power source as the power source for each drive motor. In the machine, a first electrical box houses an inverter power generation section including heat generating parts fixed to a heat sink exposed inside the machine room, and a second electrical box houses an inverter control circuit such as a frequency control section. The above-mentioned problem is solved by configuring a refrigerator which is arranged separately in a room, with the opposing sides of the first electrical box facing the suction side ventilation path of each condenser.

(E) Effect In the above configuration, since the opposite side surfaces of the first electrical box face the suction side ventilation passages of each condenser, the first The electrical equipment box is efficiently cooled, suppressing the temperature rise of the heat generating components housed in the first electrical equipment box. Moreover, since the second electrical box that houses the control circuits such as the frequency control section is placed apart from the first electrical box that houses the inverter power generation circuit, the control circuit is affected by noise generated from the inverter electrical generation circuit. This prevents malfunctions.

(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. 3 is a sectional view taken along line AA in FIG. The machine room 2 defined in the upper part includes compressors 3 and 4 for compressing refrigerant including compressor drive motors 3A and 4A, condensers 5 and 6,
Two condensing units are arranged in parallel, each consisting of condenser air cooling fans 7, 8, etc., arranged between the compressors 3, 4 and condensers 5, 6.

As shown in FIG. 4, the drive motors 3A and 4A are inverter-controlled to keep the temperature of the storage chamber 9 constant, and their electric circuits are as follows:
Inverters, which are waveform generation circuits and heat-generating electronic components
An inverter power generation circuit 10 having an IC or the like;
A magnetic switch 12, which operates the frequency control circuit that outputs a frequency control signal based on the internal temperature sensor 11 to the inverter power generation circuit 10, and the drive motors 3A, 4A simultaneously or alternately.
It is constituted by a control circuit 14 having a switching circuit etc. for controlling the opening and closing of 13.

Of these, the inverter power generation circuit 10 is
At this time, the inverter IC 10A, which is a heat generating electronic component, is stored in the first electrical equipment box 15.
5 and exposed to the machine room 2
is fixed. On the other hand, the control circuit 14
is housed in the second electrical equipment box 17.

Thus, the first and second electrical equipment boxes 15 and 17
are arranged in the machine room 2 at a distance from one side 15A of the first electrical equipment box 15 to which the heat sink 16 is attached, and the second
By forming the suction ventilation passage 18 in front of the condenser 5 by the electrical equipment box 17, one side 15A of the first electrical equipment box 15 faces the suction ventilation passage 18,
By forming a suction ventilation path 19 in front of the condenser 6 by the other side surface 15B of the first electrical component box 15 opposite to the one side surface 15A and the side surface 2A of the machine room 2, the first electrical component box The other side 15B of 15 faces the suction ventilation path 19.

In the above configuration, the compressor drive motor 3
During cooling when A and 4A are operated simultaneously or alternately, when the condenser air cooling fans 7 and 8 rotate in synchronization with the motors 3A and 4A to forcefully cool the condensers 5 and 6, the ventilation passage 18 , 19, the first electrical box 15 is cooled, and in the embodiment, since the heat sink 16 faces the ventilation path 18, the heat sink 16 is directly cooled, and the inverter IC, 10
Effectively suppresses the temperature rise of A. In addition, since the first and second electrical equipment boxes 15 and 17 are arranged apart from each other, the inverter IC driven at high frequency,
Control circuit 14 caused by 10A noise
It is also possible to prevent malfunctions.

In the embodiment, the heat sink 16 is attached to one side 15A of the first electrical box 15 facing the ventilation passage 18, but the heat sink 16 is attached to the other side not facing the ventilation passages 18, 19. Even if it is attached, a sufficient indirect cooling effect can be expected, and also in such other embodiments, the temperature rise of the heat generating components can be suppressed.

(G) Effects of the invention As described above, the invention is based on the invention as described above, in which the heat sink to which the heat-generating parts are fixed is attached to one side and the other side of the first electrical equipment box, which is attached so as to be exposed to the machine room, to the suction in front of each condenser. Because it is placed facing the ventilation path, the first electrical box is ventilated not only when both condenser air cooling fans are rotating, but also when either fan is rotating. The electrical equipment box is cooled, thereby suppressing the temperature rise of the heat-generating components, and making it possible to protect and downsize the heat-generating components.

Moreover, since the second electrical box that houses the control circuit is located away from the first electrical box that houses the inverter power generating circuit that includes heat-generating parts, noise generated from the inverter power generating circuit is a cause of noise. Malfunctions of the control circuit can also be prevented.

[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, 4... Compressor, 3A, 4A
... Compressor drive motor, 5, 6 ... Condenser,
7, 8... Condenser air cooling fan, 10... Inverter power generation circuit, 10A... Inverter IC (heat generating component), 14... Control circuit, 15...
First electrical box, 15A...one side, 15B...other side, 16...heat sink, 17...second electrical box,
18, 19... Suction ventilation path.

Claims (1)

[Scope of utility model registration request] A machine room divided into the upper part of the main body includes a compressor for compressing refrigerant, a motor for driving the compressor, a condenser,
By installing two condensing units consisting of condenser air cooling fans, etc. in parallel, and controlling the frequency using an inverter power source as the power source for each drive motor,
A refrigerator that controls internal temperature includes a first electrical box that houses an inverter power generation circuit including heat generating components fixed to a heat sink exposed in the machine room, and a first electrical box that houses an inverter control circuit such as a frequency control section. A refrigerator characterized in that a second electrical equipment box and a second electrical equipment box are arranged separately in a machine room, and the opposing sides of the first electrical equipment box are respectively arranged to face the suction side ventilation passage of each condenser.