JP2594834Y2 - Intake unit for automotive air conditioner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake unit of an air conditioner for an automobile, and more particularly to an automotive air conditioner having an improved mounting structure in which the resistor for controlling the rotation speed of a blower is arranged in the intake unit for cooling. The present invention relates to an intake unit for an air conditioner.

[0002]

2. Description of the Related Art The number of revolutions of a blower connected to a power supply for an automobile is controlled by a control circuit including a resistor disclosed in Japanese Utility Model Laid-Open Publication No. Sho 59-186,110, for example, and a controller installed in a vehicle cabin. When the blower changeover switch is operated, the resistance value applied in the circuit changes, whereby the value of the current flowing in the circuit changes, and the motor speed of the blower reaches a desired speed.

As disclosed in the above publication, this type of resistor is provided in an air passage of an intake unit, and the heat generated by the resistor is cooled by intake air to extend the life of the resistor. Have maintained.

However, when the resistor is installed in the air passage of the intake unit as described above, since the resistor has a ventilation resistance, there is a problem that not only the blowing efficiency of the blower is reduced but also a wind noise is generated. . Therefore, in order to solve such a noise problem, for example, Japanese Utility Model Laid-Open No. 57-9,608
And Japanese Unexamined Utility Model Publication No. 62-149,414 have been proposed.

[0005] The intake unit disclosed in the latter publication has a blower 4 provided in a casing 1 as shown in FIG. 3, and a scroll section 2 and a blower duct section through which air introduced by the blower 4 flows. 3 are formed in the casing 1. In addition, this intake unit 9
Is connected to a cooler unit 10, which cools the intake air when passing through the evaporator 11. A cooling air intake chamber 14 is provided in a scroll nose portion 13 located at a boundary portion between the ventilation duct portion 3 and the scroll portion 2 of the intake unit 9, and controls the rotation speed of the blower 4 in the room. A resistor 12 is mounted.

[0006]

[Problem to be solved by the present invention]
In Japanese Patent No. 9,608, the intake unit is divided into upper and lower parts and a resistor is mounted in a bypass formed in a lower part of the unit. Therefore, the production of the unit casing becomes complicated, and the number of parts is reduced. There was a fear that it would increase. Further, there is a possibility that water mixed into the outside air introduced from the intake of the unit accumulates in a lower portion of the unit and adversely affects the resistor.

In Japanese Utility Model Laid-Open Publication No. Sho 62-149,414, a resistor is installed at a position close to a scroll nose portion, but such a scroll nose portion has a small air flow rate. There was a disadvantage that the resistor could not be cooled sufficiently.

[0008] As described above, in order to simultaneously achieve the cooling function of the resistor and the noise prevention, various methods proposed so far have not been satisfactory. For example, JP-A-59-22
Although the structure disclosed in Japanese Patent No. 4,298 is suitable for preventing noise, it is insufficient in terms of the cooling effect because it cools only the surface of the radiation fin. Also,
There is a resistor in which the resistance is flattened, that is, a so-called flat resistance is arranged at a position where a large amount of air is blown to enhance the cooling effect (for example, Japanese Utility Model Laid-Open No. 2-149,304). However, it was not satisfactory in terms of noise control.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a simple structure, does not become a source of noise, is excellent in the cooling performance of a resistor, and has a high airflow efficiency. It is an object of the present invention to provide a high intake unit for a vehicle air conditioner.

[0010]

In order to achieve the above object, an intake unit of a vehicle air conditioner according to the present invention has a scroll part and a blow duct part extending from the scroll part in a casing. In the intake unit of an air conditioner for a vehicle, which is provided with a multi-blade blower that introduces air from an inlet opened in the casing and blows the air, the air blown by the multi-blade blower is guided. Forming a bulging portion bulging to the outside of the casing on a side wall of the ventilation duct portion,
A main air passage through which a main amount of the air passes through the air duct and a sub air passage through which a part of the air passes, substantially on an extension of a side wall of the casing from the scroll portion to the air duct. A resistor for controlling the rotation speed of the multi-blade blower or a partition formed integrally with the casing and having substantially the same shape as the resistor is selectively attached to a position where the fan is divided. At this time, the air blown by the multi-blade blower is formed between a resistor or a partition attached to the blower duct portion and a side wall of the casing, and can flow into and out of the sub-flow passage from the main wind passage. It is preferable that an opening located on the upstream side of the air is formed narrower than an opening located on the downstream side of the air.

[0011]

The intake air blown by the multi-blade blower flows from the scroll section to the blow duct section along the side wall of the casing, from which the blow air is blown to a cooler unit or a heater unit connected downstream of the intake unit. Is done. At this time, in the present invention, a resistor that controls the rotation speed of the multi-blade blower or a partition formed integrally with the casing and having substantially the same shape as the resistor is provided on an extension of the side wall of the casing from the scroll portion to the blow duct portion. The air duct is selectively attached so as to be divided into a main air passage through which a main amount of air passes and a sub air passage through which part of the air passes. Therefore, most of the air flowing down from the scroll portion passes through the main air passage as it is, and at the same time, the resistor has a function of guiding the air, and at the same time, one surface thereof is cooled by the passage of the air. In addition, a part of the air flowing down from the scroll portion flows into the sub air passage to cool the other surface of the resistor. In particular, regarding the opening through which the intake air can flow into and out of the sub-airflow from the main airflow, if the opening located on the upstream side of the air is formed narrower than the opening located on the downstream side,
Since the air from the scroll portion does not directly flow in from the upstream opening but flows in from the downstream opening and flows in, it is possible to prevent wind noise caused by the upstream opening. it can.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a cross-sectional view showing an intake unit according to an embodiment of the present invention, FIG. 1B and FIG.
FIG. 2C is a sectional view taken along the line BC-BC in FIG.
(A) and FIG. 2 (B) are cross-sectional views showing a mold for molding the casing of the embodiment. Parts common to those of the conventional intake unit shown in FIG. 3 are denoted by the same reference numerals. is there.

First, as shown in FIG. 1A, air is introduced into an intake unit from an inside air intake or an outside air intake (not shown), and the air is connected to a cooler unit or an air intake unit connected to the intake unit. A multi-blade blower 4 for blowing air to a heater unit (neither is shown) is provided therein. A spiral scroll portion 2 eccentric to the blower 4 and a blow duct portion 3 extending from the scroll portion 2 in a substantially tangential direction are formed in a casing 1 around the blower 4. The air introduced by the blower 4 flows along the shape of the scroll portion 2 and then passes through the blower duct 3 and the blower duct portion 3
Is blown to a cooler unit or the like from an opening 15 formed at the tip of the air conditioner. In addition, the opening 15 opened at the tip of the ventilation duct 3 of the intake unit,
Fitted and connected to the cooler unit via a seal member, etc.
After passing through the cooler unit, the intake air is blown into the vehicle compartment as conditioned air from a heater unit (not shown) connected to the other end of the cooler unit.

In this embodiment, as shown in FIG.
A bulging portion 5 bulging out of the casing 1 is formed on a side wall of the air duct portion 3, and a flat resistance (flat resistor) FR is attached on a substantially extended line of the side wall from the scroll portion 2 to the air duct portion 3. Thereby, the air duct 3 is divided into a main air passage 3a and a sub air passage 3b.

The flat resistance FR is obtained by printing a circuit (pattern) including resistors and electric wires on a flat plate in order to control the rotation speed of the multi-blade blower 4.
As shown in (B), a sealing member such as packing is sandwiched in an opening 16 formed in the bottom wall of the casing 1 and fastened with bolts or the like.

When this flat resistance FR is mounted on an extension of the side wall of the casing 1, FIG.
As shown in (A), openings 7a and 7b are formed before and after that, and the main air passage 3a of the air duct 3 from the scroll portion 2 is formed.
Is caused to flow to the sub air passage 3b.
In particular, it is preferable that the opening area S1 of the opening 7a on the upstream side with respect to the direction of air flow be smaller than the opening area S2 of the opening 7b on the downstream side. This is because, when a part of the air in the main air passage 3a is guided to the sub air passage 3b, if the air is directly introduced from the upstream opening 7a, a so-called whistling sound may be generated. Therefore, the opening area S1 of the opening 7a on the upstream side is made smaller than the opening area S2 of the opening 7b on the downstream side, and a part of the air in the main air passage 3a is reduced as shown by an arrow in FIG. The air is introduced into the sub air passage 3b from the downstream opening 7b. By doing so, the occurrence of whistling noise can be prevented, and a sufficient cooling effect on the back surface of the flat resistance can be expected.

In the embodiment shown in FIG. 1B, the rotation speed of the blower 4 is controlled by the flat resistance FR, but this control may be performed by a power transistor. And when this power transistor is attached to a cooler unit, for example,
Although the flat resistance FR shown in FIG. 1B is not required, the intake unit of the present invention takes into consideration the common use of the intake unit even when the specifications of the vehicle type are different as described above.

That is, as shown in FIG. 1 (C), a partition wall 6 having substantially the same shape as the flat resistance FR is integrally formed on the bottom wall of the casing 1 so that air from the scroll portion 2 to the air duct 3 can be removed. Flat resistance F
The value is always kept constant regardless of the presence or absence of R.

As described above, in order to cope with the presence or absence of the flat resistance FR, the mold for molding the casing 1 is preferably configured as shown in FIGS. 2 (A) and 2 (B). For example, in a case where the partition 6 is formed in the casing 1, as shown in FIG. 2A, the casing 1 is provided between the casing 1 and the lower mold 19 by using an upper mold 18 having a concave portion 17 corresponding to the partition 6. The cavity 20 corresponding to 1 is formed. on the other hand,
If the flat resistance FR is to be attached, a cavity 20 is formed between the flat die FR and the lower die 19 by using the same upper die 18 in which the bridge die 21 is inserted into the concave portion 17. In this way, it is possible to form two types of casings at low cost without using a slide die, depending on the presence or absence of flat resistance.

Next, the operation of the embodiment will be described. The intake air blown by the multi-blade blower 4 flows from the scroll section 2 to the blow duct section 3 along the side wall of the casing 1, and from there, to the cooler unit or the heater unit connected downstream of the intake unit. It is blown.

At this time, in this embodiment, a flat resistance FR or a partition wall 6 having substantially the same shape as the flat resistance FR is provided on an extension of the side wall of the casing 1 from the scroll portion 2 to the air duct portion 3, and the air duct portion 3 Is selectively mounted so as to be divided into a main air passage 3a through which the main amount passes and a sub air passage 3b through which part of the air passes.

Therefore, most of the air flowing down from the scroll portion 2 passes through the main air passage 3a as it is,
The flat resistance FR performs the function of guiding the air, and at the same time, one surface thereof is cooled by the passage of the air.

The openings 7a, 7b through which the intake air can flow from the main air passage 3a to the sub air passage 3b are formed so that the upstream opening 7a is narrower than the downstream opening 7b. Air from the scroll part 2 is supplied to the upstream opening 7a.
Instead of flowing directly from the opening, it flows around from the downstream opening 7b. Therefore, the back surface of the flat resistance FR is cooled, and whistling noise caused by the opening 7a on the upstream side can be prevented.

In addition, the use of the molding dies shown in FIGS. 2A and 2B facilitates the molding of the casing regardless of the presence or absence of flat resistance.

[0025]

As described above, the intake unit of the present invention is extremely simple in structure, and is excellent in both the effect of cooling the resistor and the effect of suppressing noise caused by the resistor. . Therefore, while maintaining the amount of air blown by the multi-blade blower, it is possible to prevent noise due to blown air and at the same time improve the reliability of the resistor.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of an essential part showing an intake unit according to an embodiment of the present invention, and FIGS.
It is sectional drawing which follows the C-BC line.

FIGS. 2A and 2B are cross-sectional views showing a mold for molding the casing of the embodiment.

FIG. 3 is a cross-sectional view of a main part showing a conventional intake unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Casing, 2 ... Scroll part, 3 ... Air duct part, 3a ... Main air path, 3b ... Sub air path, 4 ... Multi-blade blower, 5 ... Swelling part, 6
... partition, 7a ... opening on the upstream side, 7b ...
Downstream opening, FR: Flat resistance (resistor), L: Extension of casing side wall.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60H 1/00 102 B60H 1/00 101

Claims (2)

(57) [Scope of request for utility model registration] A scroll part (2) and a ventilation duct part (3) extending from the scroll part (2) are formed in a casing (1), and air is introduced from an inlet opened in the casing (1). The multi-blade blower (4) that introduces and blows air is
(1) In the intake unit of an air conditioner for a vehicle provided in the (1), the casing (1) is provided on a side wall of the ventilation duct portion (3) through which the air blown by the multi-blade blower (4) is guided. A swelling portion (5) swelling outwardly of the casing (1), extending substantially along a line (L) of a side wall of the casing (1) from the scroll portion (2) to the ventilation duct portion (3). ,
The multi-blade fan (4) is located at a position where the air duct (3) is divided into a main air passage (3a) through which a main amount of the air passes and a sub air passage (3b) through which a part of the air passes. A) a resistor (FR) for controlling the number of revolutions or a partition (6) formed integrally with the casing (1) and having substantially the same shape as the resistor (FR) is selectively mounted. Intake unit for air conditioner. 2. A multi-blade blower (4) which is formed between a resistor (FR) or a partition (6) attached to the blower duct (3) and a side wall of the casing (1) and blows air by the multi-blade blower (4). The openings (7a, 7b) through which the blown air can flow from the main air passage (3a) to the sub air passage (3b) are closer to the openings (7a) located upstream of the air. Opening located downstream of air (7b)
The intake unit for an automotive air conditioner according to claim 1, wherein the intake unit is formed narrower.