JPH058455Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Field of Industrial Application The present invention relates to a refrigeration system equipped with a heat-generating inverter IC installed in a prefabricated low-temperature warehouse or the like to increase or decrease the frequency of power supplied to a compressor.

(b) Prior art For example, in Japanese Utility Model Publication No. 59-246214, a cooling unit and a mechanical unit are integrated with a partition plate, and the mechanical unit is divided into a compressor room and an electrical equipment room with a partition plate. A refrigerant compressor is disposed in the compressor room, and desired electrical components are disposed in the electrical component compartment, and a ventilation hole is provided in the partition plate to communicate the two chambers. A heat dissipation blower that blows air from the product room to the compressor room side faces the ventilation hole, and a drive motor for the blower is located in the electrical equipment room,
Further, a sub-cooler for the refrigerant compressor is placed close to and opposite to the vent hole, and a suction port for sucking in outside air is formed on the wall surface forming the electrical equipment room, and an exhaust port is formed on the wall surface forming the compressor room for discharging the warm air inside. A refrigeration system is shown.

(c) Problems to be solved by the invention In the above-mentioned conventional technology, the heat dissipation blower is installed in the partition board inside the mechanical unit, and when the blower is operated, the air passing through the electrical equipment room is free from dust from the outside. When the blower is operated for a long period of time, the dust gradually enters the electrical components installed in the electrical component room, causing a problem of failure and malfunction of the electrical components. Ta.
Further, when an inverter IC is provided as the electrical component in the electrical component room in order to control the power supply frequency to the refrigerant compressor, the heat generated by the inverter IC is large and its treatment becomes a problem. A problem has arisen in that when dust in the air enters the inverter IC, the dust may cause the inverter IC to malfunction or malfunction. The present invention aims to solve the above problems.

(d) Means for solving the problems The present invention was made to solve the above problems, and will be explained below based on an embodiment. The condenser 6, the condenser blowers 7, 7 provided on the upper surface of the unit case 3A, and the heat sink 46 protruding into the ventilation passage in the unit case formed between the condenser 6 and the blowers 7, 7. To provide a refrigeration system comprising: an exothermic inverter IC 47 which is fixed to and located outside the ventilation path and increases/decreases the power supply frequency to the compressors 5, 5 which together with the condenser 6 constitute a refrigeration cycle. It is.

(E) Effect The following will explain based on an example. When the refrigeration system 2 is in operation, the air sucked into the external unit 3 by the operation of the condenser blowers 7, 7 flows through the condenser 6.
After the heat exchange is carried out at
6, it also absorbs heat from this heat sink and is discharged to the outside.Also, since the inverter IC47 is located outside the heat exchange chamber 3C, which serves as the ventilation path for the external unit 3, heat is transferred to the inverter IC47. Exchange room 3C
Dust in the air passing through will not enter.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

1 shown in FIG. 4 is a prefabricated refrigerator, and a refrigeration device 2 is provided on one side wall of this prefabricated refrigerator. The refrigeration system 2 consists of an external unit 3 and an internal unit 4. The external unit 3 is divided by a partition plate 3B into an upper heat exchange chamber 3C and a lower machine room 3D. A condenser 6 constituting a cycle, an axial flow type condenser blower 7,
7th grade is installed. Here, each blower 7,
7 is drive motor 7M, 7M and fan 7F, 7F
As shown in FIGS. 2 and 3, the fans 7F, 7F are supported by support members 7a, 7a, and face the air outlets 10, 10 on the top wall of the unit case 3A. Further, compressors 5, 5, etc. that constitute a refrigeration cycle are arranged in the machine room 3D. Note that C is a controller for control. In addition, the internal unit 4 is provided with evaporators 8, 8 and blowers 9, 9 for the evaporators, which together with the compressor and the like constitute a refrigeration cycle. As described above, the air outside and inside the refrigerator is circulated through the refrigeration device 2. Note that 4A is a drain pan and 4B is a drain pipe.

Further, as shown in FIG. 1, an electrical box mounting member 11 is provided on one side of the external unit 3. This electrical box mounting member 11 is fixed to the frame of the external unit 3 by flanges formed on both upper and lower edges. Further, 15 is an electrical equipment box, and this electrical equipment box 15 is attached to the upper part of the electrical equipment box mounting member 11.

The electrical equipment box 15 will be described below based on the exploded perspective view of FIG. 6. 17 is a steel plate frame formed by bending and welding metal plates, and this frame has punched holes 18.
It consists of a rear wall 20 and a side wall 21, in which mounting holes 22 are formed on both upper and lower edges of the rear wall 20, and electrical box mounting holes 2 are formed on the periphery of the punched holes 18.
3... is formed. Further, on the lower surface of the side wall 21, a hinge fixing part 19 protruding rearward, air convection notches 24, 25, and input/output wiring through holes 26, 2 are provided.
7 is formed. Furthermore, 28 is a hinge, 3
0 is a middle partition plate, 31 is a cover, the middle partition plate 30 is formed by bending a metal plate, and a notch 33 for upper air convection, which serves as a ventilation path, is formed on the upper edge of the partition part 32; A hinge fixing portion 34 and lower air convection notches 35, 35 serving as ventilation passages are formed on the edge. 36A is a cover stopper on the side surface 36;
6B is a partition plate stopper, 37, 37 is a cover stopper, one end of each stopper is welded to the side edge of the partition plate 30, and the other end is a fixing part 37a, 37a.
is formed. Further, the cover 31 is formed by bending a metal plate into a U-shape, and a plurality of upper small holes 42 for discharging convective air, which serve as ventilation paths, are formed on the upper part of the front wall 40 and the bent part side of the lower wall 41. and a plurality of lower small holes 43 for suctioning convective air.

The electrical equipment box 15 is configured as described above, and an aluminum heat sink 46 with a fin 45 formed thereon is attached as a heat sink to the front wall 20 of the frame 17 using the heat sink mounting holes 23. . As shown in FIGS. 8 and 9, the heat dissipation plate 46 is equipped with an inverter IC 47 that controls and increases/decreases the power supply frequency to the compressors 5 and 5, and is mounted on a heat conductive fixing plate 48 made of steel plate. The heat dissipation part on the surface is covered and fixed with an insulating sheet. Moreover, the partition part 32 of the middle partition plate 30
A coil board 53 is provided at intervals on the surface on the heat sink side, and a board 54 for controlling the inverter IC is provided on the surface on the cover side. The partition plate 30 is rotatably supported by a hinge 28 as shown in FIG. Further, the cover 31 is fixed to the inner partition plate 30 by screws at the cover stopper portion 36A of the inner partition plate 30 and cover stoppers 37, 37. The interior of the electrical equipment box 15 is divided by a partition plate 30 into a first space 38 on the heat sink 46 side and a second space 39 on the cover 31 side. Then, the electrical equipment box 15 is attached to the electrical equipment box mounting member 11 on the rear wall 20 of the steel plate box body.
When the heat sink plate 46 is fixed with screws using the mounting holes 22 of the It protrudes into the ventilation channel. In addition, the inverter IC 47 is located outside the heat exchange chamber 3C, and other electrical components are attached to the lower part of the electrical box mounting member 11.
The opening surface of 1 is covered with a unit case 3A. A removable lid 3a is provided on the side of the unit case facing the electrical equipment box 15.

Here, when the cooling unit 2 is operated, the condenser blowers 7, 7 are operated, and outside air is sucked in through the opening 3E of the unit case 3A and heat exchanged while passing through the condenser 6. Then, it passes through the condenser 6 and is 5℃ to 10℃ higher than the outside temperature.
The rising warm air passes through the heat exchange chamber 3C in the outside unit 3, as shown in FIGS. 2 and 3, and is blown out to the outside by the condenser blowers 7, 7.
As shown in FIGS. 2 and 3, the warm air flows from the electrical equipment box mounting member 11 to the heat exchange room 3C near the condenser blower 7, where the air velocity is high, between the condenser 6 and the condenser blower 7, 7. Heat sink 4 protruding from the top
It passes through the surface of the fin portion 45 of No. 6. The heat on the surface of the fin portion 45 is removed by the warm air and is discharged from the condenser blowers 7, 7 to the outside of the outside unit 3. or,
Since rotary compressors are used for the compressors 5, 5, remote type desuperheaters H, H are connected to the heat exchange chamber from the respective compressors 5, 5 through the notches 3b, 3b of the partition plate 3B. is extended, and the windings of the compressors 5, 5 are cooled by desuperheaters H,
This is done by removing heat from H by warm air passing through the heat exchange chamber 3C.

Furthermore, the heat generated in the inverter IC 47 is directly transmitted from the back side to the heat sink 46 and the inverter
The heat is transmitted from the surface of the IC 47 to the fixing plate 48, and from this fixing plate to the heat sink 46, where it is radiated.The heat is also radiated from the surface of the fixing plate 48 to the first space 38, thereby warming the air in the first space. At this time, as shown in FIG. 9, part of the air that has entered the second space 39 from the lower hole of the cover 31 passes through the second space 39 and is discharged outside the electrical box 15. A part of the lower air convection notch 3 of the middle partition plate 30
5, 35 to the first space 38, is heated in the first space 38 by the heat dissipation of the inverter IC 47, flows from the upper air convection notch 33 of the partition plate 30 to the second space 39, and is heated by the front cover 31. Natural convection flows outward from the upper pores. and,
The warm air flowing into the electrical box mounting member 11 is drawn into the outside unit 3 by the operation of the condenser blowers 7, and is blown out to the outside of the unit. In addition, when replacing the electrical components of the coil board 53 or the inverter IC 47 due to a failure, for example, remove the cover 31 and rotate the cutting plate 30 with the hinge 28 to form an opening, as shown in FIG. Then the work is done.

In addition, electrical noise generated from the inverter IC 47 due to the on/off of internal power transistors, for example, is transmitted to the heat sink 46, the frame 17, and the partition plate 30.
The electrical noise does not affect the board 54 on the cover 31 side of the partition plate 30.
Note that the coil board 5 on the heat sink 46 side of the partition plate 30
3 may be affected by the noise.

Therefore, the fin portion 45 of the heat sink 46 through which heat is transferred from the inverter IC 47 is located between the condenser 6 of the heat exchange chamber 3C of the cooling unit 2 and the condenser blowers 7, 7, and is located between the condenser blower 7 and the wind speed near the condenser blower 7. Since it protrudes to the top of the fast ventilation section, the warm air that has passed through the condenser 6 passes through the surface of the fin section 45 at a high speed.
Heat can be taken away from the fin portion 45 by this warm air, so there is no need to provide a new blower to cool the heat sink 46, and the condenser blower 7, 7 that is already installed can cool the heat sink 46. This can be done by forced ventilation in the heat exchange chamber 3C due to the operation of
The IC can operate normally. Furthermore, the air sucked into the heat exchange chamber 3C by the operation of the condenser blowers 7, 7 exchanges heat with the heat sink 46, but the air is located outside the heat exchange chamber 3C and is not connected to the inverter IC 47 inside the unit case 3A. It does not flow around the inverter IC 47, and as a result, it is possible to prevent dust in the air from entering the inverter IC 47, and it is also possible to avoid failure and malfunction of the inverter IC 47 due to the dust.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, the electrical box mounting member 11 may be provided on the left side of the external unit 3, and the heat sink 46 may be attached to the condenser 6 of the external unit 3. By protruding into the ventilation path between the condenser blowers 7, 7, the same effects as in the above embodiment can be obtained.

(g) Effects of the invention Since the invention is a refrigeration system configured as described above, the heat sink provided with the inverter IC is made to protrude into the ventilation path between the condenser and the condenser blower. When the air blower is operated, the air flowing through the ventilation path flows along the surface of the heat sink, absorbing heat from the surface, and the air sucked into the case by the condenser blower exchanges heat with the condenser. It can also be used for heat exchange with the heat sink, and as a result, there is no need to provide a new blower or the like for cooling the heat sink, and heat exchange can be performed by flowing air along the heat sink. This allows the inverter IC to operate normally while avoiding an excessive temperature rise. Moreover, the inverter
Since the IC is located outside the ventilation path protruding from the heat sink, it is possible to prevent dust in the air passing through the ventilation path from entering the inverter IC. Malfunctions and breakdowns can be avoided.

[Brief explanation of the drawing]

1 to 9 show an embodiment of the present invention,
Fig. 1 is a partially cutaway perspective view of the refrigeration system, Fig. 2 is a schematic vertical sectional view of the refrigeration system, Fig. 3 is a partially cutaway front view of the external unit, and Fig. 4 is a longitudinal sectional view of the prefabricated refrigerator. Figure 5 is a schematic perspective view of the refrigeration system, Figure 6 is an exploded perspective view of the electrical box, Figure 7 is a schematic perspective view of the electrical box, Figure 8 is a vertical sectional view of the electrical box, and Figure 9 is the electrical box. FIG. 2... Refrigeration device, 3... External unit, 3A...
... Unit case, 5, 5 ... Compressor, 6 ... Condenser, 7, 7 ... Condenser blower, 46 ... Heat sink, 47 ... Inverter IC.

Claims (1)

[Scope of utility model registration request] A unit case, a condenser provided on the side surface of the unit case, a condenser blower provided on the top surface of the unit case, and a ventilation path in the unit case through which air passes from the condenser to the blower. a heat dissipating plate disposed on the unit case, and a heat-generating inverter disposed on a side surface of the unit case outside the ventilation path and in contact with the heat dissipating plate.
Refrigeration equipment equipped with IC.