JPS621669Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved construction of a refrigerator, and more particularly to the construction of a support device for a triac used for electronic circuits.

Conventionally, many refrigerators of this type use electronic circuits for operation control, etc., but in this case, the triax installed in the electronic circuit carries a large current, so a heat sink is placed along it. Generally, this heat sink is fixed to the printed circuit board using screws or the like while maintaining an insulating distance.As a result, the number of parts to be mounted is high, and the cost is high.The design and manufacturing process is also complicated due to the large number of work steps.

This proposal was made in consideration of these points, and the figures will be explained below.

Reference numeral 1 denotes a refrigerator body composed of an inner box 2, an outer box 3, and a heat insulating material 4 filled with foam between the two boxes 2 and 3, and the inside is divided into two upper and lower chambers 6 and 7 by a partition wall 5, The front openings of the upper and lower chambers 6 and 7 are closed by door bodies 8 and 9 so as to be openable and closable, respectively. The two upper and lower chambers 6,
7 accelerates the cold air cooled by the evaporator 11 disposed in the cooling chamber 10 formed in the partition wall 5 with the forced circulation fan 12, and
The water is supplied to the upper and lower chambers 6 and 7 through the above.
The discharge port 15 of the duct 14 that discharges cold air into the lower chamber 7 is equipped with a damper 18 that is operated by a temperature regulator 17 that is operated by directly or indirectly detecting the temperature of the lower chamber 7 with a temperature sensor 16. The damper 18 adjusts the degree of opening and controls the amount of cold air flowing into the lower chamber 7. 19 and 20 are refrigerant compressors and condensers arranged on the outer bottom and back of the main body 1;
Together with the evaporator 11 and the like, it forms a refrigerant cycle. The temperature regulator 17 is heated by a compensating heater 21 which is constantly energized to prevent malfunctions due to low temperature atmosphere.

In FIG. 2, 22 is a diode 23, 24,
A full-wave rectifier circuit in which 25 and 26 are bridge-connected is connected to the compensation heater 21 for voltage drop.
27 is an electronic control circuit, which is connected to the output side of the rectifier circuit 22 with a Zener diode 23 and a smoothing capacitor 29 connected in parallel. The electric motor 30 for the refrigerant compressor 19 has a main winding 30A and an auxiliary winding 30B connected to the electronic control circuit 27 via triaxes 31 and 32, respectively, and is controlled in operation by the control circuit 27. . 33 is a defrosting heater for the evaporator 11, which is connected to the electronic control circuit 27;
It is connected to via a triac 34, and energization is controlled by this control circuit 27. 35 is a power source, and 36 is an electric motor for the fan 12 connected in series with door switches 37 and 38 which are opened and closed by opening and closing the door bodies 8 and 9. A drain heater 39 is connected in series to the compensation heater 21 and serves as a voltage drop resistance of the rectifier circuit 22 for heating a dew water drainage device (not shown).

A transistor 40, a terminal plate 41, etc., and diodes 42, 43 constituting the electronic control circuit 27
, a capacitor 44, etc. are supported and mounted on a printed circuit board 45, and the triac 31
The _T2 electrode 31A, which is one of the power supply electrodes, is supported and fixed by a screw 47 and a nut 48 to a vertical side 46A of a heat dissipating plate 46, which also serves as a current conductor, and whose side surface is bent into an approximately inverted L shape. , and leg terminals 31B, 31
C is soldered 49 to the printed circuit board 45.
The other triaxes 32 and 34 are also triax 31.
Similarly, one power supply electrode is supported and fixed in common to the heat sink 46, and unlike the other triaxes 31 and 34, the triax 32 is supported and fixed on the back side of the vertical side 46A of the heat sink 46. ing. The horizontal side 46B of the heat sink 46 functions as a heat sink, and the triax 31, 32, 34
The shape is an inverted L shape.
It is not necessary to make it only in the shape of a letter, and the shape can be selected as appropriate.

Since this project is constructed as described above, the power terminals of the multiple triacs connected to the main winding and auxiliary winding of the electric motor that drives the refrigerant compressor of the refrigerator, and the defrosting heater of the evaporator are connected to the heat sink. Because they are fixed in common, the power to each triax and the heat dissipation of each triax are achieved with a single heat sink, which simplifies the structure. Also, since the heat sink is fixed to the printed circuit board using multiple triaxes, external stress is reduced. The heat dissipation plate can be used as an auxiliary device, and breakage of the leg terminals is also reduced.

In addition, in this type of refrigerator, the electric motor is generally not operated while the defrosting heater is defrosting the evaporator, so it is not common for all the triaxes to be energized at the same time, so even if they share a heat sink. This has great practical effects, such as making it possible to efficiently dissipate the heat generated during maximum heating when the main winding and the auxiliary winding are simultaneously energized with a minimum heat dissipation area.

[Brief explanation of the drawing]

Figure 1 is a schematic vertical cross-sectional view of the proposed refrigerator, Figure 2 is its electrical circuit diagram, Figure 3 is a perspective view of the main parts, and Figure 4 is a schematic longitudinal sectional view of the refrigerator.
The figure is a sectional view of the main part of FIG. 3. 31...triax, 45...printed circuit board, 46...heat sink.

Claims (1)

[Scope of utility model registration request] A refrigerant compressor operated by an electric motor consisting of a main winding and an auxiliary winding, a defrosting heater for the evaporator, and a plurality of triaxes each connected to the main winding, the auxiliary winding, and the defrosting heater. , a heat dissipation plate that also serves as an energizer, and an electronic control circuit to which the electric motor and the defrosting heater are respectively connected via the triax, and the triax has one of its power supply electrodes supported and fixed to the heat dissipation plate, respectively. A refrigerator characterized in that the leg terminals are supported by soldering or the like on a printed circuit board on which components of the electronic control circuit are supported and mounted.