JP5157762B2 - Blower - Google Patents

Description

  The present invention relates to a blower device having a mechanism for taking in cooling air and cooling a motor, for example, a blower device suitable for use in a vehicle air conditioner.

Conventionally, as a blower such as an air conditioner for a vehicle, a part of the blown air is taken in as cooling air from an air inlet provided near the discharge port of a fan casing surrounding the blower fan, and is guided to the motor side to cool the motor. There is a configuration one.
In such a blower, water taken into the fan casing is guided into the motor from the wind pressure of the blower fan as a measure to prevent moisture contained in the blown air from entering the motor. Protrusions are provided to prevent this. However, in the case where moisture is contained in the cooling air taken from the air intake provided near the discharge port of the fan casing, a configuration for removing this moisture before reaching the motor is not provided.

Then, in the air blower 1 in patent document 1, the infiltration prevention means of the following structures is disclosed.
In the air blower 1 here, as shown in FIG. 10, the fan casing 2 which has the suction inlet 3, the discharge outlet 4, the blower fan 6 arrange | positioned inside the scroll casing part 5 of the fan casing 2, and the motor In order to prevent moisture contained in the air taken in for cooling from entering the motor, the air provided on the side wall 7 of the nose portion formed downstream of the scroll casing portion 5 An intake port 8, a chamber 9 that communicates with the air intake port 8 and is formed outside the scroll casing portion 5, and is opened at a position below the air intake port 8 in the gravity direction in the chamber 9. A cooling air port 10 that is in communication with the intake port 8 and serves as an intake port for air to cool the motor, and a waterproof provided in the chamber 9 and interposed in a path from the air intake port 8 to the cooling air port 10. It has a configuration that includes a 11 (see FIG. 11).
That is, in the blower 1, the waterproof wall 11 is provided next to the cooling intake downstream of the intake passage, or the weir 12 is provided on the nose portion side wall 7 near the air intake 8 to prevent inundation. Yes.

JP 2007-1541 A

However, this narrows the ventilation path, which makes it difficult to take in the motor cooling air, and causes problems such as a contradiction that the motor is not cooled and the formation of the resin mold due to the high weir.
Therefore, paying attention to the behavior of water droplets, such as the water that has entered the blower passes through the wall surface from the scroll and enters the motor cooling intake, means for draining the water droplets traveling down the passage wall surface downstream of the scroll downward from the passage inlet. By taking this measure, the inventors came to the viewpoint that flooding could be prevented without reducing the cooling air to the motor.
The present invention has been proposed from the above viewpoint, and provides a blower device that prevents moisture contained in the air taken in for cooling the motor from entering the motor. The purpose is to do.

In order to solve the above problem, in the invention described in claim 1, a scroll fan casing (21) having a suction port (24) and a discharge port (27), and air is supplied into the fan casing (21). A blower fan (22) that is introduced and discharged, a motor (23) that drives the blower fan (22), and a fan passage (21) near the discharge port (27) in the fan casing (21), the fan casing (21) In the air blower provided with an air intake (28) for taking a part of the air sent into the air and sending it as cooling air to the motor (23), the air intake (28) is located inside the fan casing (21). were fed a step formed to avoid the air passage of air, provided with stepped portions for water droplet penetration preventing (31), the stepped portion (31), in the fan casing (21) Characterized by comprising a casing divided surface (PL) from the step edge was extended to the lower portion from (21a) and a lower casing (21b) (31a).

As a result, when moisture is contained in the air taken in from the air intake port (28), a part of the air sent into the fan casing (21) for cooling the motor (23) is contained in the air. The moisture of the water touches the wall surface of the passage to condense to form water droplets, and the water droplets travel along the wall surface of the passage and are guided from the surface of the air intake port (28) to the step portion (31) formed with a step by avoiding the air passage. .
Since the step portion (31) has a lower wind pressure than the ventilation passage, the water droplets flow downward, not in the blowing direction, due to their own weight, and are drained.

  Thereby, the water droplet induced | guided | derived to the level | step-difference edge part (31a) can be guide | induced to a site | part from a division surface (PL) with a lower casing (21b) with dead weight, and can use for waste_water | drain.

The invention according to claim 2 is characterized in that the lower casing (21b) is formed with a water draining slit (32) communicating with the ventilation passage.

  Thus, the water droplets guided by the step edge portion (31a) to the lower portion from the split surface (PL) with the lower casing (21b) are drained to the ventilation passage through the water draining slit (32).

The invention according to claim 3 is characterized in that the step edge portion (31a) is formed in a plurality of steps.

  As a result, even when the amount of water droplets is large and cannot be guided in one stage, the second stage, which is less affected by the wind pressure than the first stage, can reliably drain the water downward.

  In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
FIG. 1 shows an example of a blower 20 used in a vehicle air conditioner according to the present invention, which will be described in detail below. As main components of the vehicle air conditioner, although not shown, an air conditioning duct for introducing air into the vehicle interior, a blower 20 as a blowing means for sending air into the air conditioning duct, a refrigeration cycle, and a hot water circuit And an air conditioner control device.
In the blower device 20, a scroll fan casing 21 configured by integrally fitting an upper casing 21 a and a lower casing 21 b, a blower fan 22 that introduces and discharges air into the fan casing 21, and this And a motor 23 for driving the blower fan 22.

The fan casing 21 includes a suction port 24 of a blower fan 22 provided at an upper portion, a scroll-shaped scroll casing portion 25 surrounding the blower fan 22 provided below the suction port 24, and a downstream side of the scroll casing portion 25. And a nose portion 26 that forms a flow path projecting sideways. A discharge port 27 of the fan casing 21 is formed at the end of the nose portion 26.
A chamber 29 that communicates via an air intake 28 is provided outside the nose portion 26 of the fan casing 21. A part of the air sent out into the fan casing 21 by the blower fan 22 is taken into the chamber 29. Further, the chamber 29 is provided with a cooling air port 30 that leads to a passage that feeds the motor 23 as cooling air at a position obliquely below the position where the air intake 28 is provided.
The air inlet 28 in the chamber 29 as described above is provided with a step portion 31 for preventing water droplets from entering, as will be described in detail later.

  The blower fan 22 is a centrifugal fan, and applies a dynamic pressure to the air using a difference in centrifugal force between an inlet and an outlet of a blade br provided on the outer peripheral portion of the fan. Examples of such a centrifugal fan include a sirocco fan having a forward blade and a turbo fan having a rear blade.

  The inner diameter of the suction port 24 is formed smaller than the outer diameter of the blower fan 22, and the suction port of the blower fan 22 is positioned substantially parallel to the suction port 24. By rotating the blower fan 22 by the motor 23, outside air and inside air are sucked into the fan casing 21 through the suction port 24, discharged in the centrifugal direction of the blower fan 22, and rectified in the scroll casing portion 25. It is sent out from the discharge port 27 and blown to an evaporator (not shown).

The scroll casing portion 25 has a function of rectifying the flow of air radiated from the blower fan 22 in the centrifugal direction and collecting the flow in one direction, and efficiently converting the power obtained by the blower fan 22 into static pressure. Yes.
The shape of the inner peripheral surface of the scroll casing portion 25 is a logarithmic spiral, and the interval between the blower fan 36 and the inner peripheral surface of the scroll casing portion 25 is configured to gradually increase in the rotational direction of the fan.

Then, the step portion 31 for preventing water droplet intrusion provided in the air intake port 28 that communicates the nose portion 26 on the downstream side of the scroll casing portion 25 and the chamber 29 will be described.
The stepped portion 31 is formed on the air inlet 28 provided on the side wall of the nose portion 26 on the upper casing 21 a side of the fan casing 21, with a leading edge portion from the upstream side to the downstream side of the airflow, one step toward the chamber 29 side. A step edge portion 31a having a predetermined dimension and a step formed avoiding the air passage is provided.
The step portion 31 extends from the upper casing 21a to the lower portion (PL) of the fan casing 21 with respect to the lower casing 21b, and the lower end portion of the step portion 31 is water formed on the lower casing 21b side. It connects with the slit 32 for extraction (refer FIG. 2).

Next, the operation and action of the blower 20 configured as described above will be described.
When electric power is supplied to the motor 23 and the blower 20 is operated, the inside air or the outside air is sucked into the suction port 24 by the blower fan 22 rotated by the motor 23, and is discharged in the centrifugal direction of the blower fan 22. The air is rectified in the air, sent out from the outlet 27, and blown to an evaporator (not shown).

  When the air is rectified in the scroll casing portion 25 and blown from the discharge port 27, a part of the blown air is taken in from the air intake port 28 on the side wall of the nose portion 26 and reaches the chamber 29. Next, the air once stored in the chamber 29 is supplied to the motor 23 via a cooling air passage (not shown) through a cooling air port 30 formed at a position below the air inlet 28 in the chamber 29, thereby 23 can be cooled. Thereafter, the air that has cooled the motor 23 is discharged toward the outside.

  By the way, the moisture (water particles, water vapor) present in the air sucked into the suction port 24 by the blower fan 22 and taken into the scroll casing part 25 touches the inner wall of the scroll casing part 25 to form dew, Become. Such water droplets travel along the inner wall of the scroll casing portion 25 by wind pressure and travel along the inner wall of the nose portion 26 (see FIG. 2).

When the water droplets reach the air intake port 28 on the side wall of the nose portion 26, the water droplets flow around the step edge 31a having a predetermined size and step formed on the chamber 29 side by wind pressure.
When water drops are brought to the step edge 31a, the wind pressure rapidly decreases. Therefore, at the step edge 31a, the water drops flow down along the step edge 31a by their own weight and reach the lower end of the step 31. Then, the water is drained to the ventilation passage through the water draining slit 32 formed in the lower casing 21b (see FIGS. 3, 4, and 5).
As a result, the water droplets do not reach the cooling air port 30 formed at the position below the air intake port 28 in the chamber 29, and water droplets can be prevented from entering the motor 23 through the cooling air passage.

  As described above, according to the blower device 20 described above, a waterproof wall is provided so as to cover the cooling air port 30 in order to prevent water droplets from entering when the cooling air is sent to the motor. If the weir at the air intake is raised, the ventilation path is narrowed, it becomes difficult to take in the motor cooling air, and it is possible to solve the problem that the motor is not cooled and that it becomes impossible to mold with a resin mold It was.

The present invention is not limited to the above-described embodiment.
(Second Embodiment)
For example, the step portion 31 for preventing water droplet intrusion provided in the air intake port 28 that communicates the nose portion 26 on the downstream side of the scroll casing portion 25 and the chamber 29 is formed to have a predetermined step on the chamber 29 side. The configuration is not limited to the step edge portion 31a.
That is, as shown in FIGS. 6 and 7, the step portion 31 for preventing water droplet intrusion is configured by retreating the step edge portion 31 a into a plurality of steps (here, two steps) toward the chamber 29.
By making the step edge portion 31a into a plurality of steps, the amount of moisture contained in the blown air is relatively large, and it is possible to cope with a case where a large amount of water droplets are generated.

(Third embodiment)
Furthermore, the air blower 20 can also be comprised as shown in FIG. 8, FIG.
In this case, the step 31 for preventing water droplet intrusion provided in the air intake 28 includes an inclined upper edge 33 for preventing water from entering from above.
As a result, even if a water droplet flows down from above, it hits the inclined upper edge 33, travels through the wall from above, guides the ingressing water droplet to a lower surface, travels through the inclined wall, and guides to the step provided in the blowing direction And can be drained downward. In addition, even in the inclined upper edge 33, like the step edge 31a of the step 31, it is possible to effectively cope with a large amount of water entering from above by forming a plurality of steps. it can.

  Further, by forming the step edge 31a and the inclined upper edge 33 in combination at the air intake port 28, not only the moisture contained in the blown air but also a large amount of water entering from above Further, the water can be drained more effectively, and water immersion into the motor 23 can be prevented.

It is a cross-sectional explanatory drawing which shows the structure of one Embodiment of the air blower which concerns on this invention. It is a longitudinal cross-sectional explanatory drawing of the air blower shown in FIG. In the air blower in FIG. 1, it is a principal part cutting arrow line view along an AA line. It is principal part cross-sectional explanatory drawing for demonstrating the effect | action of the level | step-difference part of the air intake in the air blower shown in FIG. It is principal part perspective explanatory drawing for demonstrating the effect | action of the level | step-difference part of the air intake shown in FIG. It is a partial cross-sectional explanatory drawing which shows the structure of another embodiment of the air blower which concerns on this invention. In the air blower in FIG. 6, it is a principal part cutting arrow line view along a BB line. It is a partial cross-sectional explanatory drawing which shows the structure of another embodiment of the air blower which concerns on this invention. In the air blower in FIG. 8, it is a principal part cutting arrow line view along CC line. It is a typical principal part top view which shows an example of the fan casing of the conventional air blower. It is a typical fragmentary top view which shows an example of the fan casing of the conventional air blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 Blower 21 Fan casing 21a Upper casing 21b Lower casing 22 Blower fan 23 Motor 24 Suction port 25 Scroll casing part 26 Nose part 27 Discharge port 28 Air intake 29 Chamber 30 Cooling air port 31 Step part 31a Step edge part 32 Water drain Slit 33 Inclined upper edge PL Dividing surface br Blade

Claims (3)

A scroll fan casing (21) having a suction port (24) and a discharge port (27);
A blower fan (22) for introducing and discharging air into the fan casing (21);
A motor (23) for driving the blower fan (22);
Air for taking a part of the air sent into the fan casing (21) into the side wall of the fan casing (21) near the discharge port (27) and sending it into the motor (23) as cooling air. In the air blower provided with the intake (28),
The air intake port (28) includes a step portion (31) for preventing water droplet intrusion, which is stepped to avoid an air blowing passage for air sent into the fan casing (21) ,
The stepped portion (31) includes a stepped edge portion (31a) extending from the upper casing (21a) to the lower casing (21b) to the lower portion of the fan casing (21) from the split surface (PL). A blower characterized by that. The blower according to claim 1 , wherein a drainage slit (32) communicating with the ventilation passage is formed in the lower casing (21b). The blower according to claim 1 or 2 , wherein the step edge (31a) is formed in a plurality of steps.

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