JPH0979188A - Blower device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate post-attachment of a baffle plate, and make cooling of a control apparatus of a blower motor effective by making a constitutive part of the control apparatus of the blower motor also serves as the baffle plate. SOLUTION: In a blower device having a baffle plate to prevent sucked air from flowing backward to a scroll part from a blower delivery port 10 in the vicinity of a nose part N of a passage in a blower unit 1, the device is constituted so that an opening part 3 is formed in the passage in the vicinity of the nose part and a control apparatus 6 of a blower motor, particularly, a heat radiating fin 7 is installed in the opening part 3. A constitutive part of the control apparatus is projected to the passage, and the constitutive part is made to also serve as the baffle plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower device for an automobile, and more particularly to a blower device provided with a baffle plate for preventing backflow of a fan in a passage in a blower unit.

[0002]

Blower devices for automobiles are shown in FIGS.
As shown in, a rib-shaped shield plate having a height of about 5 mm, which is called a baffle plate 13, is formed near the nose portion 12 of the lower case 11 on the motor flange side. This baffle plate 13 allows the sucked air to flow into the blower discharge port 14 when the ventilation resistance in the blower unit becomes high.
To prevent the backflow from the backflow to the scroll portion 15 and prevent the performance of the blower device from being deteriorated, and to remove the noise generated by the backflow.

That is, in this type of blower device,
Even if the fan speed is constant, the ventilation resistance in the blower unit described above increases when the blowout mode of the air conditioner is changed from, for example, the vent mode to the foot mode or the differential mode. Since it becomes higher, the high pressure air at the blower discharge port flows backward from the vicinity of the low pressure nose portion to the scroll portion in the form of a short circuit. When the air from the blower discharge port flows backward to the scroll portion in this manner, the performance of the blower device deteriorates and the pressure distribution in the blower unit becomes unstable, which causes noise.

Further, in this type of blower device, generally, a control device such as a register or a power transistor for adjusting the rotation speed of the blower motor is attached to the lower surface of the passage in the vehicle blower unit. FIG. 5 shows a blower unit with a register attached. In this figure, reference numeral 21 is a blower unit, which is equipped with a fan 22 and a blower motor 23 for driving the fan 22,
A register 25 is attached to the unit 4.

Since the resistor 25 is a kind of resistor and generates heat, it needs to be cooled. For this reason, the blower air is blown against the register 25 to cool the register. However, in order to reduce the blowing resistance and the wind hitting sound as much as possible, the register mounting surface 26 is generally lower than the passage surface 27. is there.

[0006]

The above-described baffle plate is useful for this type of blower device, and the presence or absence of this type of blower device causes the following differences.
FIG. 6 is a diagram showing a blower characteristic, and in the coordinates in which the vertical axis represents pressure P and the horizontal axis represents air volume Q, a solid line shows a solid line and a solid line shows a solid line without a baffle plate. Indicates that the pressure is higher, and therefore, the air volume increases at the location where the ventilation resistance line A intersects (actual operating state point) by ΔQ with the baffle plate. That is, even in the same system, the baffle plate having the baffle plate has a larger air volume, so that it is preferable to form the baffle plate.

However, since the baffle plate is formed integrally with the lower case and cannot be retrofitted in the manufacturing process, the shape of the baffle plate is determined at the stage of designing the blower device for each vehicle type. Is.
Therefore, even if the blower device is basically common, only the baffle plate will be different when the conditions used are different, and in that case, it is necessary to change the manufacturing mold eventually, so multiple I have to prepare the mold. Furthermore, the finished product is limited to the vehicle model and cannot be applied to other vehicle models.

On the other hand, in the control device for the blower motor such as the register described above, it is necessary to cool the heat generating portion thereof, but on the other hand, it is necessary to satisfy the demands for reducing the blowing resistance and wind noise. In the past, it was not good enough to positively protrude from the passage surface.

The present invention has been made in view of the above circumstances. In this type of blower device, the baffle plate is also used as a component of the control device of the blower motor, so that the baffle plate cannot be retrofitted. In addition, it is possible to provide a blower device capable of effectively cooling the control device of the blower motor, which has been conventionally avoided to be actively projected from the passage surface although it is necessary. Has an aim.

[0010]

According to a first aspect of the present invention, a baffle plate is provided near a nose portion of a passage in a blower unit to prevent sucked air from flowing backward from a blower discharge port to a scroll portion. In the blower device,
While forming an opening in the passage near the nose portion,
A control device for a blower motor is configured to be mounted in the opening, and a component of the control device is projected into the passage,
The blower device is configured so that the constituent parts also serve as the baffle plate.

The second invention of the present application is a blower device provided with a baffle plate for preventing sucked air from flowing backward from the blower discharge port to the scroll portion in the vicinity of the nose portion of the passage in the blower unit. An opening is formed in the passage in the vicinity of the nose portion, and a control device for a blower motor having a heat radiation fin on the upper portion is attached to the opening, and the heat radiation fin of the control device is projected into the passage. A blower device configured such that the heat radiation fins also serve as the baffle plate.

With such a structure, basically, by using the control device of the blower motor, which is attached later, as the baffle plate, it becomes possible to attach the baffle plate which has been considered impossible in the past.

On the other hand, by using a blower motor control device, especially a radiation fin, as a baffle plate,
The control device of the blower motor can be actively cooled, and the cooling efficiency can be improved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

In this example, a case where a register, which is a control device for a blower motor, is mounted on the lower surface of the passage in the vicinity of the nose portion in the blower unit will be described as an example.
Shows an opening 3 formed in the lower surface 2 of the passage in the blower unit 1 facing the register 6 of the blower motor M. The opening 6 is mounted with the register 6 from below. Is.

For convenience of description, the register 6 will be described first. The register 6 shown in FIGS. 1 and 2 is a device for adjusting the rotation speed of the blower motor. Inside, a coil and a changeover switch are provided, and the supply voltage is changed by changing the resistance value, thereby switching the rotation speed of the blower motor. In addition, the radiation fins 7, 7 are provided on the upper portion of the register 6.
Is provided. Reference numeral 8 denotes a flange portion, and the upper surface of the flange portion forms a sealing surface 9. In the flange portion 8,
A screw insertion hole (not shown) is provided for fixing the register 6 with a screw when it is fitted in the opening 3.

The opening 3 has a rectangular cylindrical portion 4 having an abutting edge 4a that abuts the sealing surface 9 of the register 6.
Further, a substantially hexagonal hanging wall 5 having a shape corresponding to the outer shape of the flange portion 8 of the register 6 is provided on the outer side of the cylindrical portion.

As shown in FIG. 2, the register 6 is mounted from below the opening 3. That is, after inserting the register 6 into the opening 3 and contacting the contact edge 4a at the lower end of the cylindrical portion 4 with the sealing surface 9, a screw (not shown) is inserted from the screw insertion hole to open the opening. The register 6 is fixed by being screwed into a female screw portion (not shown) of the portion 3. At this time, the radiation fins 7, 7 project upward from the lower surface 2 of the passage, and the inside of the lower end of the hanging wall 5 is in contact with the outer circumference of the flange portion 8 of the register 6.

The radiation fins 7 and 7 are, as shown in FIG.
It is located in the vicinity of the nose portion N, and these heat radiation fins 7, 7 also serve as a baffle plate.

A plurality of the radiation fins 7, 7 are arranged so as to face the air blowing direction, and the protruding height thereof is gradually reduced as the distance from the nose portion N increases. That is, since the radiation fins 7 and 7 also serve as the baffle plate, the one closest to the nose portion N is largely projected to prevent sucked air from flowing backward from the blower discharge port 10 to the scroll portion. This prevents the performance of the blower device from deteriorating and eliminates the noise generated by the backflow. In addition, the radiation fins 7, 7
When it goes out of the lower surface 2 of the passage, it becomes ventilation resistance and increases noise. On the other hand, unless it protrudes upward from the lower surface 2 of the passage, it does not exhibit the heat dissipation effect. The protruding height is gradually reduced.

Further, in the case of this example, the radiation fins 7, 7 are
Items that are linear in a plan view are arranged at equal intervals. However,
Not limited to this, the curved surface, the one including a straight line and the curved surface, the one in which slits are formed in the heat radiation fins, the intervals are not evenly spaced, and the performance of the blower device and the degree of noise It is advisable to decide it in consideration of cooling performance and the like.

According to the specific example described above, an opening is formed in the passage in the vicinity of the nose, and a register having heat radiation fins is attached to the opening.
And let the radiation fin of the register protrude into the passage,
Since the radiating fins also serve as the baffle plate, the radiating fins can perform the original cooling action on the one hand, and the radiating fins on the other hand also serve as the baffle plate, forming the baffle plate integrally. Is unnecessary, which causes the inconvenience that the conventional blower device has, that is, it is necessary to change the manufacturing mold due to the difference in the baffle plate, and it is necessary to prepare multiple molds. Can eliminate the inconvenience that it is limited to that vehicle type and cannot be applied to other vehicle types.

In this example, the register is used as the control device of the blower unit, but the control device may be the above-mentioned power transistor or other devices in addition to the register. Further, although the radiation fins have been described as an example of a component of the control device, it is needless to say that the invention is not limited to this example.

[0024]

According to the present invention, which is constructed as described above and uses the control device for the blower motor which is attached later as the baffle plate, it is possible to attach the baffle plate which has been considered impossible in the past. Therefore, basically, when the blower device is common and only the baffle plate is different, the control device that constitutes the baffle plate may be appropriately changed, and it is necessary to prepare a plurality of molds as in the conventional case. In addition, there is an advantage that the finished product can be applied to other vehicle types without being limited to that vehicle type.

Further, since the blower motor control device, in particular, the radiation fin is used as the baffle plate, the blower motor control device can be positively cooled, and the cooling efficiency can be enhanced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a blower device showing a state in which a register of a blower motor is opposed to an opening formed on a lower surface of a passage in a blower unit.

FIG. 2 is a partially cutaway plan view of a blower device showing a state in which a register of a blower motor is attached to an opening formed in a lower surface of a passage in a blower unit.

FIG. 3 is a partially cutaway plan view of a blower device including a baffle plate near a nose portion in a blower unit.

FIG. 4 is a longitudinal sectional view of the same.

FIG. 5 is a vertical cross-sectional view of the blower device showing a state in which a register is attached to an opening formed on the lower surface of the passage in the blower unit.

FIG. 6 is a diagram showing an air volume-pressure characteristic of a blower.

[Explanation of symbols]

 1 Blower Unit 2 Lower Surface 3 Opening 4 Cylinder 4a Abutting Edge 5 Hanging Wall 6 Register 7 Heat Dissipation Fin 8 Flange 9 Sealing Surface 10 Blower Discharge Port 11 Lower Case 12 Nose 13 Baffle Plate 14 Blower Discharge 15 Scroll 21 Blower unit 22 Fan 23 Blower motor 24 Passage 25 Register 26 Register mounting surface 27 Passage surface M Blower motor N Nose part

Claims (2)

[Claims] 1. A blower device provided with a baffle plate for preventing sucked air from flowing backward from a blower discharge port to a scroll portion in the vicinity of a nose portion of a passage in a blower unit. While forming an opening in the passage,
A blower device characterized in that a control device for a blower motor is mounted in the opening, and a component of the control device is projected into the passage so that the component also serves as the baffle plate. 2. A blower device provided with a baffle plate for preventing sucked air from flowing backward from a blower discharge port to a scroll portion near a nose portion of a passage in a blower unit. While forming an opening in the passage,
A control device for a blower motor having a heat radiation fin on the upper side is attached to the opening, the heat radiation fin of the control device is projected into the passage, and the heat radiation fin also serves as the baffle plate. And a blower device.