JPS6344246Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a motor cooling structure for an automotive air conditioner, and in particular to a motor cooling structure that also has the function of rectifying the air flow after the fan. Regarding cooling structure.

(Prior Art) In general, an air conditioner 1 for an automobile is well known and will not be described in detail, but as shown in FIG. Intake unit 6 with etc.
, a cooler unit 9 having an evaporator 8 that communicates with the refrigerant conduit 7 and forms part of the cooling cycle and cools the introduced air; a heater core 11 that heats the introduced air using engine cooling water as a heat source; Air and this heater core 1
1, and a heater unit 12 having an air mix door 10 for distributing air and air bypassing the heater unit 1.

In this automotive air conditioner 1, the outside air intake port 2 is provided with a means (not shown) to prevent the intrusion of rainwater, etc., but in the outside air introduction mode, the inside of the intake unit 6 is filled with rainwater or water from washing the car. May absorb water.

In this case, if rainwater enters the motor M for driving the fan, it will cause various inconveniences to the motor M, so it is necessary to prevent this as much as possible. It also cannot be made into a closed structure.

Therefore, conventionally, as shown in FIG. 2, a fan scroll is provided at a distance from the bell mouth 13 to prevent rainwater, etc. entering from the bell mouth 13 that guides the air sucked in by the fan 5 from directly hitting the motor M. Motor cooling air intake 1 at the bottom of 20
A through hole 18 is opened in the end plate 17 of the motor casing 15, and a through hole 18 is opened in the end plate 17 of the motor casing 15 to communicate the motor cooling air intake 14 and the motor casing 15, which has a substantially sealed structure, through a cooling pipe 16. The air flowing in from the motor casing 16 passes through the motor casing 15, cools the motor M, and then flows out from the motor casing 15 (see Japanese Utility Model Publication No. 57-28010).

(Problem to be Solved by the Invention) However, in such a motor cooling structure, rainwater etc. that enter from the bell mouth 13 fly along the flow of the wind near the bottom of the fan scroll 20. Fanscroll 2 for rainwater, etc.
The motor cooling air intake 1 provided at the bottom of the
4 through the cooling pipe 16 to the motor casing 1
There is a possibility that it will be in the top 5.

Further, as shown in FIG. 3, which is a schematic cross-sectional view taken along the line - in FIG. Because it is narrow,
An uneven velocity distribution occurs in the air passing through the evaporator 8. As shown in graph 22 in the figure, the velocity distribution of the air passing through the evaporator 8 is large in the portion corresponding to the discharge port 21, and small in the portion below it. If the velocity distribution of the air passing through the evaporator 8 is non-uniform, uniform heat exchange over the entire surface of the evaporator 8 will be inhibited, the heat exchange rate will differ in some parts, and the cooling performance of the evaporator 8 will decrease as a whole. It turns out.

The present invention was developed in view of these circumstances, and includes a motor cooling structure that prevents rainwater from entering the cooling pipe through which motor cooling air passes, and a motor cooling structure that prevents air from the fan from entering the motor cooling structure. The purpose is to add the function of rectifying the flow of air and making the velocity distribution of air passing through the evaporator etc. uniform.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the present invention includes a fan scroll having a built-in fan rotated by a motor and a bell mouth for guiding air sucked by the fan; In a motor cooling structure for an automotive air conditioner, which communicates with the inside of the motor through a cooling pipe so that cooling air circulates,
A wind direction changing plate having one longitudinal end fixed to the bottom plate of the fan scroll and rectifying the wind from the fan is provided at the discharge port of the fan scroll; At the same time, a conductive passage having a motor cooling air intake opening is provided in the thick part at the end of the upper plate side of the fan scroll provided with the bell mouth, and cooling air is taken in from the motor cooling air intake. is made to pass through the conduit passage of the wind direction changing plate and to be guided to the cooling pipe.

(Function) In the present invention configured as described above, the air blown out from the fan scroll is rectified by the wind direction changing plate, and its velocity distribution is generally uniform, so that it flows from the outlet of the fan scroll and flows into the evaporator. Since the velocity distribution of the air passing through the evaporator is a substantially uniform parallel flow, uniform heat exchange is performed throughout the evaporator, and its cooling performance does not deteriorate.

In addition, since the cooling air intake is located and opened at the end of the upper plate of the fan scroll, rainwater is sucked in together with the air from the bell mouth of the fan scroll and splashes along the wind flow near the bottom of the fan scroll. etc. will not be sucked into the cooling air intake. This prevents rainwater and the like from entering the inside of the motor through the conduction path and the cooling pipe, thereby preventing various problems from occurring in the motor.

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

FIG. 4 is a schematic sectional view similar to FIG. 3 showing a motor cooling structure according to the present invention, FIG. 5 is a perspective view of the same motor cooling structure, and FIG. 6 is a sectional view taken along the - line in FIG. Components common to those shown in FIGS. 1, 2, and 3 are given the same reference numerals.

In this embodiment, as shown in the figure, a wind direction changing plate 25 is provided at the discharge port 21 of the fan scroll 20 to rectify the wind from the fan 5 so that the wind uniformly hits the evaporator 8. .

The wind direction changing plate 25 has a streamlined shape that has a semicircular thick walled portion 25a at its end on the air upstream side, and becomes thinner as it goes toward the air downstream side from the semicircular thickened portion 25a. It is becoming.

The reason why the wind direction changing plate 25 is shaped into a streamlined shape is to reduce the pressure loss at the discharge port 21 and
This is to prevent the wind force from weakening.

Further, this wind direction changing plate 25 is connected to the evaporator 8.
In order to ensure that the wind is uniformly applied to the wind, the wind is tilted at a predetermined angle α with respect to the main flow of the wind.

In this embodiment, as shown in FIG. 6, the wind direction changing plate 25 is fixed to the bottom plate 27 of the fan scroll 20, and the upper plate 27 of the fan scroll 20 is
There is a gap between the two.

Further, the thick wall portion 25a of the wind direction changing plate 25 is provided with a conduction path 26 on the upper surface of the end on the side of the upper plate 28, in which the motor cooling air intake port 14a is opened.

Further, the end portion of the thick portion 25a fixed to the bottom plate 27 is fixed so that the through hole provided in the bottom plate 27 and the conduction path 26 coincide with each other. , cooling pipe 16
are installed in succession.

That is, the motor cooling air intake 14a communicates with the cooling pipe 16 through a conduction path 26 in the air direction changing plate 25. This cooling pipe 16 communicates with the inside of the motor casing 15. Furthermore, the end plate 17 of this motor casing 15
A through hole 18 is formed in the fan scroll 20 so that air entering the motor casing 15 from the cooling pipe 16 returns to the fan scroll 20 through the through hole 18.

Note that the wind direction changing plate 25 can be integrally provided when the fan scroll 20 is molded from resin. The cooling pipe 16 is made separately from a rubber hose or the like and is attached.

In such a motor cooling structure of an automobile air conditioner, the discharge port 2 of the fan scroll 20
Because of the wind direction changing plate 25 provided in the evaporator 1, the velocity distribution of the air passing through the evaporator 8 becomes uniform, as shown in the graph 22a in FIG.

Furthermore, since rainwater and the like sucked in together with air from the bell mouth 13 of the fan scroll 20 fly along the wind flow near the bottom of the fan scroll 20, the motor located in the upper part of the fan scroll 20 There is almost no possibility that the rainwater or the like will be sucked in together with the air from the cooling air intake port 14a.

Further, the present invention is not limited to the above-described embodiments, and the following modifications are possible. That is, as shown in FIG. 7, the wind direction changing plate 25 is fixed to the bottom plate 27 and the upper plate 28 of the fan scroll 20, and the motor cooling air intake 14b is connected to the end of the wind direction changing plate 25 near the upper plate 28. It may also be formed by a plurality of holes that are open to each other.

This case also has the same effect as the above embodiment.

Further, the wind direction changing plate 25 is not limited to the streamlined shape as long as the shape allows the air discharged from the discharge port 21 of the fan scroll 20 to uniformly flow into the evaporator 8.

Furthermore, it is also possible to apply the present invention to an automobile air conditioner that does not have the evaporator 8.

[Effects of the invention] As described above, according to the invention, a wind direction changing plate is provided at the discharge port of the fan scroll, one longitudinal end of which is fixed to the bottom plate of the fan scroll, and which rectifies the wind from the fan. The end of the change plate on the air upstream side is made into a thick wall part, and the thick part is provided with a conduit passage with a motor cooling air intake opening at the end of the upper plate side of the fan scroll equipped with a bell mouth. ,
Since the cooling air taken in from the motor cooling air intake is guided to the cooling pipe through the conduit passage of the wind direction change plate, rainwater etc. do not enter into the cooling pipe through which the motor cooling air passes. Since rainwater and the like do not enter the motor casing, the life of the motor is extended.

In addition, this motor cooling structure also serves as a structure that rectifies the flow of air from the fan, so if there is an evaporator etc. downstream of the fan, the air will flow uniformly to the evaporator etc. It has excellent effects such as being able to fully demonstrate its cooling performance.

[Brief explanation of the drawing]

Figure 1 shows a typical automotive air conditioner;
The figure is a cross-sectional view of main parts showing a conventional motor cooling structure, Figure 3 is a schematic cross-sectional view taken along the - line in Figure 1, and Figure 4 is a schematic cross-sectional view along the - line of Figure 1.
The figure is a schematic sectional view similar to FIG. 3 showing a motor cooling structure according to an embodiment of the present invention, FIG. 5 is a perspective view of the same motor cooling structure, and FIG. 6 is a sectional view taken along the line - FIG. 7 is a sectional view similar to FIG. 6 showing a motor cooling structure according to another embodiment of the present invention. 5... Juan, 13... Bellmouth, 14,1
4a, 14b...Motor cooling air intake, 16...
Cooling pipe, 20... Fan scroll, 21...
...Discharge port, 25... Wind direction changing plate, 25a... Thick part, 26... Conduction path, 27... Bottom plate, 28... Top plate.

Claims (1)

[Claims for Utility Model Registration] (1) Cooling air flows between the inside of the motor 1 and the fan scroll 20 which has a built-in fan 5 rotated by a motor M and has a bell mouth 13 for guiding the air sucked by the fan 5. In a motor cooling structure for an automobile air conditioner that is connected to the motor cooling pipe 16 so as to circulate, one longitudinal end thereof is connected to the discharge port 21 of the fan scroll 20 and the bottom plate 27 of the fan scroll 20.
A wind direction changing plate 25 is provided to fix the wind from the fan 5, and the end of the wind direction changing plate 25 on the air upstream side is a thick part 25a, and the bell mouth is attached to the thick part 25a. A conduit passage 26 with a motor cooling air intake opening is provided at the end of the upper plate 28 side of the fan scroll 20 provided with the fan scroll 20, and the cooling air taken in from the motor cooling air intake is transferred to the conduit passage of the wind direction changing plate 25. 26 and leading to the cooling pipe 16. (2) The motor cooling structure for an air conditioner for an automobile according to claim 1, wherein the wind direction changing plate 25 is formed into a streamlined shape.