JPH0526933Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a centrifugal blower installed in a vehicle air conditioner.

[Prior art] Commonly used in automotive air conditioners,
In centrifugal blowers driven by electric motors, a motor cooling air passage is installed to blow some of the air discharged from the blower into the motor case in order to suppress the heat generated by the motor. ing.

FIGS. 10 and 11 are attached drawings published in "Utility Model Publication No. 54-25690" regarding this type of blower, and the motor case 31 of the electric motor 30 for driving the multiblade fan 6 A metal annular flange 32 for attaching the motor 30 to the bottom surface of the blower casing 2 is fixed. A semi-cylindrical bulging portion 32A is integrally formed in the radial direction of the flange 32, and the opening surface of the semi-cylindrical bulging space A in the cylinder axis direction is formed by a metal plate piece 32.
By welding and sealing using No. 3, a motor cooling air passage is formed. As shown in the figure, the air inlet end of this air passage is connected to an opening a provided near the discharge port of the blower casing 2, and the air outlet end is connected to the inside of the motor case 31 through a vent hole b. .

Another method for forming the motor cooling air passage is
A method of integrally forming an air passage in a blower casing made of hard synthetic resin is disclosed in ``Kokai No. 168615/1983''. There is also a method in which the opening a and the vent b are communicated with each other using a rubber hose or the like.

[Problems to be solved by the invention] The above-mentioned method of integrally molding the motor cooling air passage into the metal plate flange fixed to the metal blower casing by press molding or the like is aimed at reducing weight. This is unsuitable for the current situation where blower casings are being replaced with synthetic resin ones, and requires inefficient processing processes.

In addition, the method shown in ``Patent Publication No. 168615/1988'' requires the use of a slide core to integrally mold the air passage with the casing, and the need to incorporate a nested structure, which complicates the structure of the mold. Moreover, it is not possible to sufficiently increase productivity because measures are required to seal openings that inevitably occur due to the design of the mold.

Furthermore, when using a rubber hose, the attachment point is the part that hits the front passenger's knee, so
There was a risk that the body would come into contact with it and fall off, creating an obstacle that further narrowed the narrow leg pace.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle air conditioner equipped with a blower equipped with a motor cooling air passage, which can be manufactured and assembled easily and quickly, and which can also be assembled by a robot.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, the bottom wall portion 3 of the scroll casing coupled to the main body 2 of the scroll casing made of synthetic resin.
A motor storage section 3 that houses the fan drive motor 5.
In a vehicle air conditioner equipped with a centrifugal blower provided with a motor cooling air passage 4 that connects a cold air inlet hole 3C provided in the motor storage portion 3A and a discharge port in the scroll casing, The motor cooling air passage 4 is formed integrally with the bottom wall portion 3 of the scroll casing, and includes a one-half air passage wall body 4G made of synthetic resin that constitutes one side of the air passage 4 in the air passage direction. and a synthetic resin half air passage wall 4A that constitutes the other half and is separate from the scroll casing, and these two walls are combined by a combining means 1A. .

In an embodiment of the present invention, the one-half side or the other half-side air passage wall body is provided with a protrusion 4D in the middle of the air passage to prevent foreign matter such as water from entering the motor housing portion 3A. This configuration was adopted.

In another embodiment of the present invention, the combining means 1A adopts a configuration in which a casing assembly screw for connecting the bottom wall portion 3 of the scroll casing to the main body portion of the scroll casing also serves this role. .

In still another embodiment of the present invention, the other half air passage wall body 4A has a concave-convex shaped portion for engaging with the mouth edge of the cold air inlet hole 3C of the motor storage portion 3A, at the end on the side of the cold air inlet 3C. We adopted a configuration that provides the 4Cs.

[Operations and Effects of the Invention] The motor cooling air passage of the vehicle air conditioner having the above-mentioned configuration has one half of the air passage wall that is integrally formed in advance when molding the bottom wall of the scroll casing. The creation and assembly can be completed extremely easily and quickly by stacking the separately created air passage wall on the other half and using extremely simple joining means such as casing assembly screws. do.

Forming both the air passage walls on one half side and the other half does not require a mold with a complicated structure as in the method of ``Utility Model Publication No. 168615/1983'', and There is no welding process, which is a major factor in reducing productivity, as in ``Publication No. 25690''. And unlike the method using a hose, it cannot easily fall off, and the external shape is extremely compact.
There is no problem of further narrowing the narrow leg space in front of the passenger seat. Furthermore, as the assembly process is simplified, assembly robots can be introduced.

[Example] The structure of the invention will be specifically explained below based on the example shown in the attached drawings.

Figures 1 to 5 all show the blower portion of an embodiment of the device according to the present invention, with Figure 1 being a side sectional view and Figure 2 depicting the state with the other half of the air passage wall removed. FIGS. 3 and 4 are a side sectional view and a plan view of the other half air duct wall, and FIG. 5 is a bottom view of the blower with the other half air duct wall removed.

The general structure of the blower section includes a casing top wall section 1 in which an inside/outside air switching box C for selectively introducing air outside the vehicle or inside the vehicle into the device is attached to the suction port;
A multi-blade fan 6 is housed inside a scroll casing B which is a combination of a casing main body 2 forming a body and a casing bottom wall 3 in which a housing 3A for a fan drive motor 5 is integrally formed.
A motor cooling air passage 4 is assembled between the discharge port 9 of the scroll casing B and the motor storage section 3A. This scroll casing B
are made of synthetic resins such as polypropylene and ABS resin.

The inside/outside air switching box C, which covers the suction port 7 on the top surface of the casing top wall portion 1 and whose air outlet is integrally connected to the top wall portion 1, includes an outside air suction port 11 and an inside air suction port. A mouth 12 and an inside/outside air switching damper 13 are provided.

The casing body 2, which has a scroll-shaped planar shape, has a casing wall near the upper end of the nose, which is the starting point of the scroll, for extracting a part of the pressurized air directed toward the discharge port 9 for motor cooling. A cooling air outlet 8 is open.

The cooling air outlet 8 is connected to the inlet end of the air guide path 14 formed along the nose portion, and the outlet end thereof is connected to the cooling air outlet 15 bored in the casing bottom wall 3. There is.

A motor case 5C is fitted into the cylindrical motor storage section 3A of the casing bottom wall 3, and a multi-blade fan 6 is fitted onto the upper end of the rotating shaft 5D of the rotor 5A. A short cylindrical bulge 3B is provided on the bottom surface of the motor storage section 3A as a cold air introduction port for sending air for cooling the motor into the storage section 3A, and a cold air inlet hole 3 is provided on the side wall surface of the motor storage section 3A.
I'm wearing C.

2 and 5, a surrounding rib 3E having a rectangular planar shape and an L-shape three-dimensionally protrudes from the casing bottom wall 3 and forms part of a first half-side air passage wall 4G for forming the first half-side air passage A1 in the air flow direction of the motor-cooling air passage 4. One end of this first half-side air passage A1 is connected to the cooling air outlet 15, and as shown in Fig. 5, a protrusion is provided with a screw hole 3F for a screw 10A, which is a joining means, and serves both as an assembly for the scroll casing B and as an attachment for the other half-side air passage wall 4A.

The other half air duct wall 4A for forming the other half air duct A2 of the motor cooling air duct 4 functions as a lid that covers the enclosing rib 3E, and is the same as the scroll casing B. Made of different types of synthetic resin. One end of the air passage wall 4A has a screw hole 4B for a screw screw 10A, and the other end has a concavo-convex shaped portion 4 for engagement with the cold air inlet hole 3C.
C is formed, and an air path A is formed in the middle of the longitudinal direction.
A protrusion 4D is provided that serves as a partition wall between the two.
Furthermore, a drainage hole 4E is provided at the bottom of the horizontal portion of the air passage A2 as required. On the other hand, an engaged portion 3D that engages the uneven portion 4C is formed at the edge of the cold air inlet hole 3C. The protrusion 4D may be provided on one half of the air passage wall 4G.

To assemble the three parts that make up the scroll casing B, first, the casing top wall 1 and the casing body 2 are removably connected using clamps or screws (not shown), and then the casing bottom wall 1 and the casing main body 2 are removably connected. This is done by fastening the portion 3 to screw holes 3F provided at multiple locations on the outer periphery of the bottom of the casing body 2 using screw screws 10A, 10B, . . . , which are joining means. At that time, the uneven portion 4C of the other half air passage wall 4A is connected to the engaged portion 3D.
If you hook it to the wall and place it overlapping the surrounding rib 3E of the air passage wall 4G on one half side, the screw screw 1
When 0A is fastened, the motor cooling air passage 4 is also attached to the scroll casing B at the same time very easily and quickly.

FIG. 6 shows a schematic side cross-section of an automotive air conditioner using the above blower. The air intake port side end of the air conditioning duct D, which also serves as the casing of the air conditioner, is connected to the discharge port 9 of the scroll casing B of the centrifugal blower. A ventilation outlet 25 for blowing out hot air, a heat outlet 26 for blowing out hot air, and a defrost outlet 27 for preventing fogging of window glass are open. Air conditioning duct D
Inside, from the upstream side toward the above-mentioned air outlet 9,
an evaporator 21 as a heat exchanger for generating cold air;
Heater core 22 as a hot water type heat exchanger for generating hot air, cold air path 24 that bypasses heater core 22
and an air mix damper 2 that selectively opens and closes the air inlet of the heater core and the air inlet of the heater core to adjust the temperature of the blown air.
3, and blow-off mode switching dampers 28 and 29 for selectively opening and closing the blow-off port groups 25 to 27 are incorporated.

Next, the operation of the above embodiment device will be explained. When the fan drive motor 5 is started using the operation panel (not shown) of the device, as the multi-blade fan 6 rotates, the cylindrical multi-blade fan 6 flows from the outside air inlet 11 or the inside air inlet 12 through the inlet 7. The air sucked into the inner space of the fan 6 is pushed out into the scroll-shaped air passage of the scroll casing B by the centrifugal force exerted by the fan 6, and the air pressure is gradually increased as it heads toward the discharge port 9.

Most of the pressurized air that has reached the discharge port 9 is sent into the air conditioning duct D as air to be conditioned;
Cooling air outlet 8 opened near the discharge port 9
Since there is a considerable pressure gradient between the cold air inlet hole 3C of the motor storage part 3A and the cold air inlet hole 3C of the motor storage part 3A which communicates with the inner space of the multi-blade fan 6 which is a low pressure area, the air about to be discharged from the blower A part of the air is naturally sucked into the motor cooling air passage 4 from the cooling air outlet 8.

The air that has followed the motor cooling air passage 4 enters the motor housing portion 3A through the cold air inlet hole 3C.
The air passes through the ventilation hole formed around the bearing of the motor rotation shaft 5D and between the rotor 5A and the stator 5B before being blown out from the upper part of the motor case 5C into the inner space of the multi-blade fan 6. The motor 5 is effectively cooled, improving the operating efficiency of the blower and preventing the motor from aging due to heat.

When the inside/outside air switching damper 13 is set to the outside air introduction mode, there is a good possibility that rain, snow, etc. will enter the device through the outside air intake port 11, There is a risk that air mixed with water and sometimes foreign matter may be pumped in. However, since a protruding part 4D in the form of a jetty is provided in the middle of the air passage 4, the progress of water and foreign matter is stopped there, and there is no fear of corrosion of the motor 5 or damage to the bearing part.

FIGS. 7 to 9 are a plan view, a front view, and a side view, respectively, showing more specific shapes of the other half side wall body 4A, and 4F constitutes the peripheral wall portion of the first half side air passage wall body 4G. This is a fitting rib for keeping the joint surface with the surrounding rib 3E airtight.

The configuration and shape of the motor cooling air passage 4 depicted in the above-mentioned embodiment diagrams are merely examples, and various design changes are possible. Further, the location where the cooling air intake port 8 is formed does not necessarily have to be the nose portion of the scroll casing.

Further, the arrangement and shape of the cooling air outlet 15 provided in the casing bottom wall portion 3 may be freely changed for convenience in designing the blower.

Furthermore, instead of using screws or screws to join the air duct walls on one half side and the other half, a snap-on type engagement device is used which is integrally formed on both air duct walls in advance. It may also be an uneven portion.

[Brief explanation of drawings]

Figures 1 to 5 all show one embodiment of the blower used in the device of the present invention, with Figure 1 being a side sectional view and Figure 2 showing the blower with the other half of the air passage wall removed. Figures 3 and 4 are side sectional views and plan views of the other half of the air duct wall, and Figure 5 is the state with the other half of the air duct wall removed. FIG. FIG. 6 is a schematic side sectional view of an air conditioner for an automobile as an example of the device of the present invention in which the above blower is assembled. 7 to 9 are a plan view, a front view, and a side view, respectively, illustrating more specific shapes of the other half air passage wall body. FIGS. 10 and 11 are a side sectional view and a roller sectional view of a conventional centrifugal blower. In the figure, 1...Casing top wall, 2...Casing main body, 3...Casing bottom wall, 3A...Motor storage section, 4...Motor cooling air passage, 3E...
Enclosing rib, 3C...cold air inlet hole, 4...motor cooling air duct, 4A...other half air duct wall, 4C...
...Concave and convex shaped portion, 4D...Protrusion, 4G...Half air passage wall, 5...Fan drive motor, 8...Cooling air outlet, 10A...Screw screw (combining means), 15... Cooling air outlet.

Claims (1)

[Scope of claims for utility model registration] 1) Main body 2 of the synthetic resin scroll casing
A motor accommodating part 3A in which the fan drive motor 5 is housed is provided protrudingly on the bottom wall part 3 of the scroll casing connected to the scroll casing, and a cold air inlet hole 3C provided in the motor accommodating part 3A and a discharge port in the scroll casing are provided. In a vehicle air conditioner including a centrifugal blower provided with a motor cooling air passage 4 connecting the motor cooling air passage 4, the motor cooling air passage 4 is integrally formed with the bottom wall portion 3 of the scroll casing, One half air passage wall 4G made of synthetic resin constitutes one side of the air passage direction of No. 4, and the other half air passage wall made of synthetic resin constitutes the other half and is separate from the scroll casing. 4A, and is formed by combining both wall bodies by a combining means 10A. 2) The air passage wall on one half side or the other half side is provided with a protrusion 4D in the middle of the air passage to prevent foreign matter such as water from entering the motor housing portion 3A. A vehicle air conditioner according to claim 1 of the utility model registration claim. 3) The combining means 10A is a casing assembly screw for connecting the bottom wall portion 3 of the scroll casing to the main body portion of the scroll casing. Or the vehicle air conditioner according to item 2. 4) Cold air inlet hole 3C of the other half air passage wall 4A
Any one of claims 1 to 3 of the claims registered as a utility model, characterized in that the side end is provided with a concave-convex shaped part 4C for engagement with the mouth edge of the cold air inlet hole 3C of the motor storage part 3A. The vehicle air conditioner described in the above.