JPS63270213A - Open and inner air switching device for intake unit - Google Patents

Abstract

PURPOSE:To reduce flow passage resistance and to improve suction efficiency, by a method wherein, in a title device for a vehicle, an outlet is communicated to the suction port of a fan, and a cylindrical damper, being rocked around an outlet to be selectively communicated to an inner air introduction port or an open air introduction port, is situated in a casing. CONSTITUTION:During a state to introduce the open air, an inlet 14 of a damper 10 is positioned in an open air introduction port 3, and an inner air introduction port 2 is closed with the side wall of the damper 10. Simultaneously, gaps between both sides of the damper inlet 14 and a damper chamber 4 are sealed by means of seal members 17a and 17b. During introduction of inner air, a wire 23 of a control mechanism 22 is controlled in the direction of an arrow mark to rock the damper 10 around a pivot 16, and the damper inlet 14 is positioned in the inner air inlet 2 as shown by a solid line. This constitution closes the open air introduction port 3 and seals gaps between both sides of the damper inlet 14 and the damper chamber 4 are sealed by means of the seal members 17a and 17b. This constitution facilitates formation of a flow passage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an internal/external air switching device for an intake unit that selectively switches the air introduced into the interior and exterior of a vehicle interior.

(Prior art) Typical conventional internal/external air switching devices include i)
Utility Model Publication No. 57-24116, ii) JP-A-59-
Publication No. 120513, 1ii) Utility Model Application No. 61-1258
There is one shown in Publication No. 12.

The inside/outside air switching device (i) is equipped with a rotatable plate-shaped rotary damper at the confluence of the inside/outside air introduction passage and the outside air introduction passage, and by selectively rotating the rotary damper, one side The structure allows only the passage to be opened.

The device ii) pivots one end of the switching door between the inside air inlet and the outside air inlet of the case, and swings the switching door to close one of the inlets to introduce inside and outside air. It has a switching structure.

iN)'s internal/external air switching device has a semicircular internal air inlet and an external air inlet formed at one end of a cylindrical case, and a semicircular switching door rotatably provided inside the case. The structure is such that one of the inlets is closed by the rotation of the , and the air is switched between inside and outside.

(Problems to be Solved by the Invention) However, although the conventional internal/external air switching devices of the above i) to 1ii) have different shapes of cases, positions and shapes of internal/external air inlets, and shapes of switching doors, Basically, it is based on the technical concept of closing either the inside air or outside air inlet with a switching door, so the air flow path between the other open air inlet and the fan suction port is inside the case. It has been difficult to obtain a suitable flow path shape for the flow of introduced air.

As a result, flow resistance increases, which becomes a factor that prevents improvement of suction efficiency and reduction of vibration and noise.

Furthermore, when providing a bellmouth-shaped curved portion to reduce flow resistance, for example, in the case of a scroll type fan, the bellmouth shape is restricted or the bellmouth-shaped curved portion is not provided. There were problems such as having to install it separately.

Therefore, in the present invention, the above-mentioned problem is solved by providing a cylindrical damper in a swingable manner between the inside and outside air intake port and the fan intake port, and by making the flow path in the damper into a suitable shape. It is an object.

(Means for Solving Problems) The inside/outside air switching device of the present invention is provided with a plurality of inside air inlets, outside air inlets, and fan suction ports in a casing, and is provided in the casing with a base end in constant communication with the fan suction port. A cylindrical damper having a damper outlet communicating with the damper and a damper inlet at the tip thereof, which is provided so as to be swingable around the damper outlet, and as the damper swings, the damper inlet and the inlet port on the inside air side or the outside air side are connected. The structure is such that the lines are selectively communicated.

(Function) Therefore, by appropriately swinging the damper through the operating mechanism or the like, the inlet is selected, and the inlet on the inside air side or the exhaust side is communicated with the damper inlet. In this case, the introduced air introduced into the damper inlet is guided to the damper outlet and the fan suction port through the passage inside the damper. The flow resistance of introduced air can be reduced both on the outside air side and on the outside air side.

(Example) An embodiment of the present invention will be described below based on the drawings.

1 to 3 show a plan view, a front view, and a left side view of the intake unit of this embodiment.

A casing 1 of the intake unit is provided with an inside air inlet 2 and an outside air inlet 3 that are square in shape and have the same shape as each other. Ori.

Each inlet 2.3 is formed to widen toward the upstream side. A lattice-shaped filter is attached to the opening of the inside air inlet 2 so as to face the interior of the vehicle, and an outside air introduction duct is connected to the opening of the outside air inlet 3.

A damper chamber 4 communicating with both of the inlets 2 and 3 is formed inside the casing l. A scroll-shaped passage 6 having a circular suction port 5 at the top is formed below the damper chamber 4, and a sirocco fan 8 is provided at the center of the scroll.
is installed.

This sirocco fan 8 is pivotally attached to the rotating shaft of a motor 9 fixed to the casing l. The scroll-shaped flow path 6 has a blowout lower connected to a duct (not shown) of an air conditioner.

The damper chamber 4 of the casing l is provided with a rotary damper lO as shown in FIG. Damper lO
The plan sectional view, front view and side sectional view of
It is shown in FIGS.

This damper 10 is formed into a box shape (cylindrical shape) consisting of an upper wall portion 11, a lower wall portion 12, and a side wall portion 13, and a square damper inlet 14 having the same shape as the introduction ports 2 and 3 is formed at the tip. ing. As shown in FIG. 5, the base end portion of the damper 10 is formed into a semicircular plane, the side wall portion 13 is curved along the semicircular shape, and the lower wall portion is formed to correspond to the semicircular shape. A circular damper outlet 15 having the same shape as the fan suction port 5 is formed at 12 . The curved portion 13a of the side wall portion 13, the damper outlet 15, and the fan suction port 5 are provided on a concentric axis, and a pivot shaft 16 is provided on the concentric axis of the upper wall portion 11 in a protruding manner. A damper IO is provided in the damper chamber 4 so as to be swingable about the pivot 16 on a plane orthogonal to the concentric axis. The swinging range of the damper IO is set to approximately 90'' corresponding to the inside air inlet 2 or the outside air inlet 3, and the damper 10 also swings in the planar shape of the damper chamber 4 accordingly. It is formed into a fan shape with a semi-circular swinging center so that it can be fitted into the center of the swing.

In addition, the damper lO has a side wall 13 having a predetermined length so that when the damper inlet 14 communicates with one of the inlets 2 and 3, the other inlet can be closed by the side wall 13. It is formed into a rectangle. Seal members 17a and 17b are provided along the vertical direction on the outer side of the damper inlet 14.
are fixed respectively, and by these, both inlet ports 2,
3, the gap between both sides of the damper inlet 14 and the damper chamber 4 is sealed. Further, when the damper inlet 14 is communicated with the inside air inlet 2, the damper upper wall 11 and the damper chamber 4
A circular band-shaped sealing member 18 as shown in FIG. 1 is provided above the earthen wall portion 11 in order to seal the gap between the earthen wall portion 11 and the earthen wall portion 11 . As shown in FIGS. 2 and 3, this seal member 18 is fitted and fixed in a recess 4a provided on the upper surface of the damper chamber 4 so as to be able to slide onto the damper 10. In this way, when inside air is introduced, the sealing members 17a, 17b and 18
Also, when introducing outside air, the seal members 17a and 17
b seals between the damper inlet 14 and the damper chamber 4.

Furthermore, as shown in FIGS. 6 and 7, the upper wall portion 11 of the damper 10 extends from the side wall curved portion 1 from the portion that is approximately the center of swing.
3a, and ribs 19a and 19b are provided upwardly protruding from the upper part of the inclined portion, and a locking pin 2° is provided protrudingly between these. This locking bottle 20
As shown in FIG. 1, it passes through an arcuate notch 21 formed in the upper part of the damper chamber IO and is connected to a wire 23 of the operating mechanism 22, and by operating this wire 23, the damper IO can be switched. It is done. Note that the damper lO is urged to be located on the exhaust side by a return spring (not shown) when the wire is not operated.

The damper outlet 15 of the damper 10 projects toward the fan suction port 5 by a predetermined length, and the proximal half of the inner peripheral portion of the damper outlet 15 is formed straight, while the remaining half is straight. is formed in a curved portion 15a curved at a predetermined radius in a bellmouth shape. This curved portion 15a is the damper L
It is continuously formed so that it curves with a gradually larger radius of curvature toward the proximal end of the O, and becomes straight at the half inner portion on the proximal end side. Therefore, although the flow path in the damper chamber 4 is bent, the flow path becomes smooth due to the inclined portion of the damper upper wall portion 11 and the bellmouth-shaped curved portion 15a. Further, as shown in FIG. 6, the damper outlet 15 of the damper lO is rotatably supported on the outer end surface of the fan suction port 5, and positioned by an annular guide protrusion 5a protruding from the outer periphery of the outer end surface. Misalignment is prevented.

In such a switching mechanism, when the outside air is introduced, the damper inlet 14 is located within the outside air introduction port 3, as shown by the two-dot chain line in FIG. 1, and is maintained by a return spring. In this state, the inside air inlet 2 is closed by the side wall 13 of the damper 10, and the damper inlet 14 is closed.
The gaps between both sides of the damper chamber 4 are sealed by seal members 17a and 17b, and only outside air is introduced into the damper inlet 14 through the outside air introduction port 3.

When introducing inside air, by operating the wire 23 of the operating mechanism 22 in the direction shown by the arrow in the figure, the damper 10 moves to the pivot 1.
6, and the damper inlet 14 is located within the inside air introduction port 2, as shown by the solid line in FIG. In this state, the outside air inlet 3 is closed by the side wall part 13 of the damper lO, and the gap between both sides of the damper inlet 14 and the damper chamber 4 is closed by the seal members 17a and 17b, and the upper part of the damper inlet 14 and the damper A gap with the chamber 4 is sealed by an annular sealing member 18, and only inside air is introduced into the damper inlet 14 through the inside air introduction port 2. In this case, since the upper part of the damper inlet 14 is sealed by the sealing member 18, internal air is prevented from entering into the case gap.
The suction efficiency of the damper inlet 14 can be increased.

The air introduced into the damper 10 from the outside air or inside air inlet ports 2 and 3 flows through the sloped portion of the earth wall portion 11 and the curved portion 1 of the side wall portion 13.
3a and the bellmouth-shaped curved portion 15a, the flow direction is smoothly changed, flows into the fan suction port 5 from the damper outlet 15, and reaches the suction lower via the scroll-shaped passage 6 due to the rotation of the fan 8. Therefore, the damper 10
Since the flow path inside is smooth due to the sloped part and the bellmouth-shaped curved part, the flow resistance is reduced and the suction efficiency of the fan 8 is increased. Since the shape of the flow path does not change, the introduction state is stabilized.

Although the present embodiment has been described with reference to the case where each inlet is provided with one port, the present invention is not limited to this, and may be applied to a case where a plurality of inlets are provided.

(Effects of the Invention) As explained above, according to the present invention, by providing a swingable cylindrical damper between the inside and outside air intake port and the fan suction port, both inside air and outside air can be exchanged. At the time of introduction, the introduced air flows through the flow path inside the damper, and the flow path shape does not change depending on when inside air is introduced and outside air is introduced, as in the past, and the flow resistance becomes stable, and the inside of the duct By appropriately setting the flow path, an ideal flow path shape can be obtained, and an improvement in suction efficiency can be expected due to a reduction in flow resistance. Further, since the bellmouth-shaped curved portion can be provided integrally with the damper, it is possible to reduce the number of parts as in the conventional case where the bellmouth-shaped curved portion is formed separately.

[Brief explanation of drawings]

1 to 7 show embodiments of the present invention, in which FIG. 1 is a plan sectional view of an intake unit, and FIG. 2 is a view of the intake unit taken in the direction of arrow 2 in FIG. 1. Figure 3 is a view of the intake unit in the direction of the ■ arrow in Figure 1, Figure 4 is a perspective view of the damper, Figure 5 is a plan view of the damper, and Figure 6 is a perspective view of the damper.
The figure is a side sectional view of the damper, and FIG. 7 is a front view of the damper. l...Casing 2.3...Inside air and outside air inlet 5...Fan suction port 10...Damper 14-φ No. damper inlet 15・φ pot damper outlet 15a...Bellmouth-shaped curved part Patent applicant: Diesel Kiki Co., Ltd. Agent: Patent attorney: Sumi Mori Figure 2

Claims (1)

[Scope of Claims] 1) An inside/outside air switching device for an intake unit that selectively switches air inside and outside a vehicle interior and sucks air selected by a fan, which comprises a plurality of inside air inlets and outside air inlets in a casing, and a fan. A suction port is provided, and a cylindrical damper is provided in the casing and has a damper outlet constantly communicating with the fan suction port on the base end side and a damper inlet at the tip, and is swingable about the damper outlet. An inside/outside air switching device for an intake unit that selectively communicates the damper inlet with the inside air side or outside air side inlet as the damper swings. 2) The internal/external air switching device for an intake unit according to claim 1, wherein the damper outlet has a bellmouth-shaped curved portion.