JPH0138319Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a waterproof blower used in, for example, an air conditioner for an automobile.

(Prior Art) Generally, as shown in FIG. 1, an air conditioner 1 for an automobile includes an intake unit 27 having an outside air intake port 2, an inside air circulation port 3, an intake door 4, a fan 5, a motor M, etc., and a refrigerant conduit. The heater unit 12 includes a cooler unit 9 having an evaporator 8 communicating with the heater 7, and a heater unit 12 having an air mixer door 10, a heater core 11, and the like.

In this automotive air conditioner 1, the outside air intake port 2 is provided with a means (not shown) to prevent rainwater from entering, but when operating in the outside air introduction mode, the intake unit 27 has It may absorb rainwater, snow, or water from car washing.

In this case, if rainwater etc. enters the motor M for driving the fan, it will cause various inconveniences to the motor M.
Ultimately, there is a risk of seizure, so it is necessary to prevent this as much as possible, but if the heat dissipation of the motor itself is taken into account, it is not possible to have a completely sealed structure.

Therefore, in the conventional blower, as shown in Fig. 2, the motor M is installed in a position where it is not directly hit by rainwater etc. entering from the bell mouth 13.
An opening 1 is located at a distance from this bell mouth 13.
4 is opened, and this opening 14 and a motor casing 15 having a substantially hermetic structure are communicated through a cooling pipe 16. A through hole 18 is formed in the end plate 17 of the motor casing 15, and air flowing in from the cooling pipe 16 passes through the motor casing 15 and cools the brushes, bearings, magnets, etc. It is designed to flow out from the through hole 18.

Further, the motor M is fixed to the fan scroll 26 via a bracket 25 by bolt fastening, and on the other hand, the motor M and the bracket 2
A rubber material 29 is interposed in the gap with the motor 5 to reduce the rattling of the motor caused by the gap and to make the motor sound and vibration proof.

(Problem to be solved by the invention) However, even with this configuration, when the so-called ram pressure wind is strong, such as when driving at high speed,
Air flow may flow into the casing 15 through the through hole 18 of the motor casing 15, and dust, water, snow, etc. may also flow into the motor casing 1 along with this air flow.
There is a possibility that it will be in the top 5. This may cause various problems in terms of motor performance.

In particular, the automobile air conditioner 1 installed in the cab-over type automobile 19 shown in FIG. Since it is directly connected to the outside air, it is not only susceptible to the influence of ram pressure wind, but also has the drawback that rainwater or water from car washing can easily enter.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a blower that allows cooling air to flow inside the motor while preventing the intrusion of rainwater and the like.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the present invention arranges a motor connected to a centrifugal fan so as to partially protrude inside the fan scroll, and connects the fan scroll to the motor casing. communicated by a cooling pipe, and a plurality of through holes are provided in the end plate of the motor casing on the side where the centrifugal fan is attached, so that air flows through and cools the inside of the motor. , an internal space formed by an elastic cover that covers a portion existing in the fan scroll of the motor, and a waterproof wall extending from the disk side of the fan at a position facing the through hole of the end plate of the elastic cover; The present invention is characterized in that a communication passage projecting in a cylindrical shape toward the motor casing is provided, and a bracket is attached to the motor casing via the elastic cover.

(Function) In the present invention configured as described above, a part of the air blown by the centrifugal fan is guided inside the cooling pipe and flows into the motor casing, and here, the air is cooling various heat-generating parts. Thereafter, the air passes through the communication path of the elastic cover from the through hole formed in the end plate of the motor casing on the fan side, and flows out into the fan scroll. Furthermore, when the ram pressure is high, such as during high-speed running, the outside air that has flowed into the fan scroll tends to flow through the through hole of the motor casing, but the through hole is Since the cylindrical communicating path and the waterproof wall extending from the fan disc are formed around the communicating path, the waterproof wall blocks rainwater etc. mixed in the outside air. what if,
Even when the rainwater passes through the waterproof wall, the passage of air containing the rainwater is curved by the waterproof wall and the cylindrical communication path, so the rainwater, etc., which is heavier than air, is It cannot flow along the curved path and collides with the path, where it is removed again. Moreover, this removed water cannot accumulate around the cylindrical protruding communication passage, and therefore does not flow into the communication passage.

In this way, rainwater mixed with outside air is reliably prevented from entering the motor casing.

(Embodiment) An embodiment of the present invention will be described below in detail with reference to the drawings.

Fig. 4 is a sectional view of essential parts of an embodiment of the present invention, and Fig. 5 is a perspective view showing an elastic cover of the same embodiment. A code is attached.

Inside the fan scroll 26, there is a bell mouth 13.
A fan 6 is provided at a position adjacent to the air intake port 28. This fan 6 is connected to a motor M via a rotating shaft 20, and a part of the motor M protrudes into the fan scroll 26, and by reducing the amount l of protrusion from the fan scroll 26, the intake unit We are trying to make the entire 27 smaller.

An opening 14 is provided in the fan scroll 26 at a position on the downstream side of the fan 6;
The opening 14 and the motor casing 15 are communicated through a cooling pipe 16. The air flowing into the cooling pipe 16 from the opening 14 is guided into the motor casing 15 and cools heat-generating components within the casing 15, such as brushes, bearings, and magnets.

Further, a plurality of through holes 18 are formed in the end plate 17 of the motor casing 15 on the fan 6 side, so that air flowing into the casing 15 is returned to the fan scroll 26.

In the present invention, the portion of the motor M that exists inside the fan scroll 26 is covered with an elastic cover 21. As shown in FIG. 5, the elastic cover 21 is formed with a plurality of communicating passages 22 that protrude into a cylindrical shape at positions facing the through holes 18 through which cooling air circulates, which are previously opened in the motor casing 15. The inner circumferential edge of the communicating path 22 projects upward to form a projecting opening 23.

The tip of this protrusion 23 protrudes into a space formed by a pair of waterproof walls 24 extending from the disk 6a side of the fan 6. That is, only the air from which moisture has been removed by the waterproof wall 24 enters the motor casing 15 of the motor M through the outlet 23, and no moisture enters. These protruding ports 23 are provided at eight locations in total, and when the motor M rotates and the fan 6 starts blowing air, a part of this air flows through the through hole 14 to the cooling pipe 16.
After entering the motor casing 15 through the through hole 18 and cooling the inside of the motor M, the opening 23 protrudes from the through hole 18.
This protrusion 23 prevents it from becoming a resistance when flowing out through the outlet.

Further, the motor casing 15 is connected to the bracket 2
The elastic cover 21 is fixed to the fan scroll 26 by fastening the bracket 25 and the motor casing 15 with bolts, and as shown in FIG. Since this elastic cover 21 can also serve as a sealing member, it can absorb and alleviate the noise and vibration generated by the motor M, making it possible to achieve soundproofing and vibrationproofing of the automotive air conditioner 1. becomes.

Next, the effect will be explained.

A part of the air blown by the centrifugal fan 6 is
The air is guided through the cooling pipe 16 and flows into the motor casing 15, where the air cools various heat generating components within the casing 15. after that,
The air is supplied to the elastic cover 2 through a through hole 18 formed in the end plate 17 of the motor casing 15 on the fan 6 side.
Passing through the communication path 22 of 1, the fan scroll 26
It will flow inside. Therefore, suitable cooling of the motor can be achieved.

Furthermore, when the ram pressure is high, such as during high-speed running, the outside air that has flowed into the fan scroll 26 tends to flow through the through hole 18 of the motor casing 15; Since a cylindrical communication path 22 is formed in the elastic cover 21 and a waterproof wall 24 extending from the fan disc 6a is formed around the communication path 22, the waterproof wall 24 prevents air from entering the outside air. Rainwater, etc. will be removed. Suppose that the rainwater flows through the waterproof wall 24.
Even in the case where the air containing rainwater passes through the waterproof wall 24 and the cylindrical communication path 22,
Because the passage is curved, rainwater, etc., which is heavier than air, cannot flow along the curved passage and collides with the passage, where it is removed again. Moreover, this removed water cannot accumulate around the communication passage 22 that protrudes into a cylindrical shape, and therefore does not flow into the communication passage 22.

In this way, rainwater mixed with the outside air is reliably prevented from entering the motor casing 15.

Furthermore, the motor casing 15 and the bracket 25
Since the elastic cover 21 is interposed between the motor M and the motor M, noise and vibration generated from the motor M can be absorbed and alleviated by the elastic cover 21.

[Effects of the invention] As is clear from the above description, according to the invention, the portion existing in the fan scroll of the motor having through holes in the end plate is covered with an elastic cover, and the cooling air is supplied to the elastic cover. A communication path was opened so that air could flow through it, and the inner peripheral edge of the communication path protruded toward the internal space formed by the waterproof wall hanging down from the disk side of the fan, so that cooling air could not enter the motor. However, water droplets do not enter, making it possible to obtain a long-life motor with less negative effects from water.Furthermore, since this elastic cover also doubles as a conventional elastic sealing member, it also serves as a soundproofing and vibrationproofing measure. It has excellent effects.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a typical automotive air conditioning system, Figure 2 is a cross-sectional view of the main parts showing a conventional motor cooling structure, and Figure 3 is an automotive air conditioning system installed in a cab-over type vehicle. FIG. 4 is a schematic diagram showing the installed state, FIG. 4 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 5 is a perspective view showing an elastic cover of the embodiment. 6... Juan, 6a... Juan disc, 15
...Motor casing, 16...Cooling pipe, 1
7...End plate, 18...Through hole, 21...Elastic cover, 22...Communication path, 23...Protrusion port, 24...
Waterproof wall, 25...Bracket, 26...Fan scroll, M...Motor.

Claims (1)

[Scope of utility model registration request] A motor M connected to the centrifugal fan 6 is disposed so as to partially protrude inside the fan scroll 26, and the fan scroll 26 and the motor casing 15 are communicated through a cooling pipe 16, and the centrifugal fan 6 is attached to the motor casing 15. A portion of the fan scroll 26 of the motor M in which a plurality of through holes 18 are provided in the end plate 17 of the motor M so that air flows through and cools the inside of the motor M. the elastic cover 2
1, and at a position facing the through hole 18 of the end plate 17 of the elastic cover 21, there is a cylindrical wall extending toward the internal space formed by the waterproof wall 24 extending from the disk 6a side of the centrifugal fan 6. A blower characterized in that a bracket 25 is attached to the motor casing 15 via the elastic cover 21, while a plurality of communicating passages 22 are provided that protrude from the motor casing 15.