JPH0486436A - Heat exchanging device - Google Patents

Abstract

PURPOSE:To improve durability of a heat exchanging device by a method wherein a blower is disposed at an upstream side of electrical parts in an electrical case and a motor of the blower is cooled without being influenced by heat generated by the electrical parts. CONSTITUTION:A blower 9 is placed adjacent to a suction port 15a above one side plate 10a of an electrical case 10. The outside air A within a ceiling space flows into the electrical casing 10 through the suction port 15a and then the outside air flows down toward a terminal plate 5 at a front surface of a movable plate 21 set at an operator's side and toward a control circuit board 7. The air also flows into a frame formed at a rear part of the movable plate 21 and flows toward a relay 6 at the rear surface of the movable plate 21 and a power transistor 4 at a front surface of a partition plate 18. The air further flows from a bottom part of the electrical casing 10 through a lower end 33 of the partition plate 18 ascends and cools the thermal radiation fins 17 and then the air is discharged out of a discharging port 15b. With such an arrangement, a temperature of atmosphere in the motor 9a is not increased more than that required.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heat exchange unit used as an outdoor unit of a split type air conditioner.

<Prior Art> Conventionally known outdoor units of split type air conditioners include an air-cooled type with a built-in air-cooled heat exchanger as described in Japanese Utility Model Publication No. 52-9772, and a water-cooled type. There is a water-cooled type with a built-in heat exchanger, and the air-cooled type outdoor unit has a blower to forcefully cool the air-cooled heat exchanger with outside air. It is installed in the box to cool the electrical components inside the electrical box.

<Invention/Problem to be Solved> However, unlike air-cooled types, water-cooled outdoor units do not have a blower for the heat exchanger, so the electrical components inside the electrical box are not forcibly cooled by the outside air, causing the temperature to rise. There was a risk that it would rise abnormally.

Furthermore, even if a blower is installed, this heat exchange unit is housed in the ceiling, so the intake air temperature can reach 43°C in the summer.
℃, and the exhaust temperature becomes 68℃ (due to the addition of heat generated by electrical components).

This poses a problem in the durability of each part. For example, the lifespan of a blower motor is 35,000 hours at an ambient temperature of 60°C (if the operating time is 12 hours a day, 24 days a month, it will be 3,456 hours in a year, and has a durability of about 10 years). It is necessary to keep the temperature below 60°C.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a heat exchange unit that solves the above-mentioned problems by arranging a blower on the windward side of electrical components.

Means for Solving the Problems> The present invention comprises a compressor, an electrical box containing electrical components and a blower, and the electrical box is provided with a vent through which outside air is taken in and discharged by the blower. is placed on the windward side of the electrical components.

Function> As mentioned above, the blower is first cooled by the outside air drawn into the electrical box, and then the electrical components are cooled. In this way, the blower is cooled without being affected by the heat of the electrical components, so its durability is improved.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

1 is a compressor 2 whose operating frequency can be changed using an inverter, a water-cooled heat exchanger 3, and a power transistor 4 for the inverter.
．． Terminal board 5. This is a sealed heat exchange unit main body in which an electrical equipment box 10 containing an electric component 8 consisting of a relay 6, a control board 7, etc., and a blower 9 consisting of a fan 9a and a motor 9b is arranged. In this case, the electrical equipment box 10 has both side plates 10a
, 1. Ob, back plate 10C and upper plate 1. Od and lower plate 10
The side plate 10a is connected to the side panel [a] on one side of the unit main body 1 by a flange piece 13, and the other side of the unit main body is A service panel 14 of the electrical box 10 is provided which also serves as a front panel of the unit body 1. Moreover, the position of the blower 9 provided in the electrical equipment box 10 is such that it is attached to the intake port 15a provided at the upper part of the one side plate 10a which is on the windward side of the built-in electrical component 8, and the air blower 9 is attached to the exhaust port 15a provided at the upper part of the one side plate 10a which is on the windward side of the built-in electrical component 8. A through hole 16 is provided in the side plate 10a facing the radiation fin 17, which is the back surface of the partition plate 18 to which the electric component 4 is attached, and the side plate]-08 is provided with a through hole 16 through which the lead wire of the electrical component 8 is introduced and led out. Further, this partition plate 18 is provided with a movable plate 21 whose one end is pivotally supported by a hinge 19 and whose other end is fixed with a screw 20, and a terminal plate 5. relay 6,
A control board 7 is attached.

In the figure, 22 is a liquid receiver disposed in the inner space of the water-cooled heat exchanger 3, 23 is a gas-liquid separator, 24 is an oil separator, and 25 is a refrigerant pipe.

Further, 26a and 26b are service valves disposed in the unit main body 1 provided at the inlet and outlet ends of the refrigerant pipe 25, and 27a and 27b are the service valves of the cooling water pipes 28a and 28b connected to the water-cooled heat exchanger 3. The connection port 29 is a drain port.

Next, this operation will be explained. First, when the compressor 2 is driven to start a predetermined cooling or heating operation, the blower 9 is rotated at the same time.

Here, the blower 9 faces the air inlet 15a above the one side plate 10a of the electrical box 10, and the outside air A in the ceiling space flows into the electrical box 10 from the air inlet 15a, and the movable plate on the front side Terminal board on the front of 215. The direction flows down to the control board 7, and also flows into the frame formed on the back of the movable plate 21, and the direction flows to the relay 6 on the back of the movable plate 21 and the power transistor 4 on the front of the partition plate]8. flow, and then from the bottom of the electrical equipment box] 0 to the lower end 3 of the partition plate 18
3, rises, cools the heat dissipation fins 17, and then moves to the active port 1.
5b (see dotted line arrow in Figure 3). That is,
Terminal board inside the electrical box 105. Since the blower 9 is located on the windward side of the control board 7° relay 6 and power transistor 4, the motor 9a of the blower 9 is directly cooled by the outside air, even if the intake air temperature is a little high (for example, in the summer). (43° C.) Since the electric component 8 itself is not affected by heat, the ambient temperature around the motor 9a will not be increased more than necessary. Furthermore, the heat generation temperature of the motor 9a itself of the blower 9 is 0.3
℃, so there is no problem in cooling the electrical components 8.

<Effects of the Invention> As described above, according to the present invention, since the blower is placed in the electrical box on the windward side of the electrical components, the blower motor is cooled without being affected by heat generated by the electrical components themselves. Therefore, durability can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view showing the inside of the heat exchange unit, FIG. 2 is a front view showing the inside of the heat exchange unit, and FIG. 3 is a side view of the heat exchange unit. It is. 1... Heat exchange unit body, 2... Compressor, 3...
・Water-cooled heat exchanger, 8... Electrical parts, 9... Blower, 10... Electrical box, 15a... Intake port, 1.5 b
···exhaust port. Patent applicant: Sanyo Electric Co., Ltd. Agent, Teio Omata

Claims (1)

[Claims] 1.Equipped with an electrical box containing a compressor, electrical components, and a blower, the electrical box is provided with a vent through which outside air is taken in and exhausted by the blower, and the blower is placed on the windward side of the electrical components. Features a heat exchange unit.