JPH01132413A - Changeover device for internal/external air of intake unit - Google Patents

Abstract

PURPOSE:To reduce flow resistance so as to prevent the change of the shape of a flow passage at the time of introducing both internal air and external air by swingably providing a cylindrical damper between internal/external air introducing ports and a fun suction port. CONSTITUTION:An internal air introducing port 2 and an external air introducing port 3 both having the same square shape are provided on the casing 1 of an intake unit in nearly mutually perpendicular directions on the same vertical plane. A damper chamber 4 connected to each introducing port 2, 3 is formed inside a casing 1, a scroll shaped flow passage 6 is connected to the innermost portion of the damper chamber 4 via a cylindrical suction port 5, and a silocco fan 8 is provided in its center. A rotary damper 10 is swingably provided around a pivot shaft 16. This damper chamber 10 is formed into a box shape consisting of wall portions 11-13 in which a square damper inlet 13 is provided on the tip end portion while a circular damper outlet 15 is provided on the base end portion, and a changeover operation is carried out by an operating mechanism 22.

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, it) JP-A-59-1
Publication No. 20513, 1ii) Utility Model Application No. 61-125812
There is something shown in the publication.

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) has a structure in which one end side of the switching door is pivotally supported between the inside air inlet and the outside air inlet of the case, and the introduction of outside and outside air is switched by swinging the switching door and closing one of the inlets. It is.

The inside/outside air switching device 1ii) has a semicircular inside air inlet and an outside air inlet formed on the negative end side of a cylindrical case, and a semicircular switching door is rotatably provided inside the case to switch the outside air. The structure is such that one side of the inlet is closed by rotating the door, switching between inside and outside air.

(Problems to be Solved by the Invention) However, the internal/external air switching devices according to the conventionally known technologies of i) to 1ii) above differ in the shape of the case, the position and shape of the internal/external air inlet, and the shape of the switching door. However, it is basically based on the technical concept of closing one of the inside air or outside air intake ports with a switching door, so the air flow path between the other open air intake port 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 a bellmouth-shaped curved portion is provided. There were problems such as having to install it separately.

Furthermore, when outside air is introduced, there is a problem in that foreign matter such as dust and pine needles is sucked in and deposited.

Therefore, in the present invention, a cylindrical damper is swingably provided between the inside and outside air intake port and the fan intake port, so that the flow path inside the damper has a suitable shape, and the foreign matter that enters from each intake port is collected. The purpose is to solve the above problem by providing a dust pocket.

(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 a fan suction port in a casing, and in the casing, a base end thereof is constantly connected to the fan suction port. A cylindrical damper having a communicating damper outlet and a damper inlet at the tip thereof, the damper inlet being selectively communicated with the inlet on the inside air side or the outside air side, is swingable around the damper outlet. A dust pocket is provided on the side wall of the casing facing the side wall of the damper.

(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 outside air 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.

Further, when the damper is switched and swung, foreign matter deposited on the inside air side or outside air side inlet is collected in the dust pocket, and it is possible to prevent foreign matter from entering the gap between the damper and the casing.

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

1 to 3 show a front sectional view, a left side view, and a plan 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. Each of the inlet ports 2 and 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 is formed inside the casing 1 and communicates with both of the inlets 2 and 3 mentioned above. A scroll-shaped flow path 6 is formed in the inner part of the damper chamber 4 and communicated through a circular suction port 5, and a sirocco fan 8 is disposed at the center of the scroll. This sirocco fan 8 is pivotally attached to the rotating shaft of a motor 9 fixed to the casing 1. The scroll-shaped flow path 6 has a blowout lower connected to a duct (not shown) of an air conditioner.

A rotary damper 10 as shown in FIG. 4 is provided in the damper chamber 4 of the casing 1. Damper 10
The front view, side sectional view and plan view are shown in Figures 5 to 5, respectively.
It is shown in FIG.

This damper 10 is formed into a box shape (cylindrical shape) consisting of a wall part 1 located in the front, a wall part 12 located in the back, and side wall parts 13 located on both sides of these, and the inlet 2, 3
A square damper inlet 14 having the same shape is formed.

The base end of the damper 10 is formed into a semicircle as shown in FIG. 5, and the side wall 13 is curved along the semicircle. 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 wall portion 11 in a protruding manner. A damper 10 is provided in the damper chamber 4 so as to be swingable about a pivot 16 on a plane orthogonal to the concentric axis. The swinging range of the damper 10 is set to approximately 90° corresponding to the inside air inlet 2 or the outside air inlet 3.
Along with this, the shape of the damper chamber 4 also changes as the damper 10 swings.
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.

Further, in the damper 10, the side wall portion 13 has a predetermined side shape so that when the damper inlet 14 communicates with one of the inlet ports 2 and 3, the other inlet port can be closed by the side wall portion 13. It is formed into a long rectangle. Furthermore, damper 1
In order to close the gap formed between the side walls 13 on both sides of the damper chamber 4 and the opposing side walls IA of the damper chamber 4, seal members 17a and 17b are provided along the horizontal direction on the outer side of the damper inlet 14. are fixed to each other, thereby sealing the gap between the damper chamber 4 and the damper chamber 4 on both sides of the damper inlet 14 at both the inlets 2 and 3. Further, when the damper inlet 14 is connected to the inside air inlet 2, in order to seal the gap between the damper wall 11 and the damper chamber 4, a circular band-like structure as shown in FIG. 1 is provided above the front wall 11. A seal member 18 is provided. As shown in FIGS. 2 and 3, this seal member 18 is fitted and fixed in a recess 4a provided on the front side of the damper chamber 4 so as to be able to come into sliding contact with the damper 10. In this way, the space between the damper inlet 14 and the damper chamber 4 is sealed by the seal members 17a, 17b, and 18 when the inside air is introduced, and by the seal members 17a and 17b when the outside air is introduced.

Further, as shown in FIGS. 6 and 7, the wall portion 11 of the damper 10 extends from a portion approximately at the center of swing to a side wall curved portion 13.
The ribs 19a and 19b are protruded from the outside of the inclined portion, and a locking pin 20 is protruded between them. As shown in FIG. 1, this locking pin 20 passes through an arc-shaped notch 21 formed on the front side surface of the damper chamber 10, and is connected to a wire 23 of an operating mechanism 22. The damper 10 is switched by the operation. Note that the damper 10 is urged by a return spring (not shown) to be located on the outside air side when the wire is not operated.

The damper outlet 15 of the damper 10 projects a predetermined length toward the fan suction port 5, and the inner peripheral portion of the damper outlet 15 includes
The proximal half inner portion is formed straight, while the remaining half inner portion is formed into a bellmouth-shaped curved portion 15a with a predetermined radius. The curved portion 15a is continuously formed so that it curves with a gradually larger radius of curvature toward the base end of the damper 10 and becomes straight in the half inner portion on the base end side. Therefore, although the flow path within the damper 10 is bent, the flow path becomes smooth due to the inclined portion of the damper wall portion 11 and the bellmouth-shaped curved portion 15a. Further, as shown in FIG. 6, the damper outlet 15 of the damper 10 is rotatably supported on the outer end surface of the fan suction port 5, and is prevented from being displaced by an annular guide protrusion 5a protruding from the outer periphery of the outer end surface. prevention will be carried out.

Also, the damper 10 of the casing 1 forming the damper chamber 4
As shown in FIGS. 1 to 3, outer air side and inner air side dust pockets 25, 25 are provided in each side wall IA, IA facing the both side walls 13, 13, respectively. These dust pockets 25 are formed to have a predetermined length facing the flat surface of the damper side wall 13, and are formed to have a width slightly larger than the depth opening width of the inlet ports 2 and 3 on the outside air side and the inside air side. . Therefore, when the damper 10 is switched from introducing inside air as shown by the solid line in FIG.
Foreign matter such as dust 28 and pine needles 29 accumulated on the upper part of the damper 3 is scraped up into the outside air side dust pocket 25 as the damper 10 is switched and oscillated.

On the other hand, when the damper 10 is switched from introducing outside air to introducing inside air, a small amount of foreign matter that has entered the vicinity of the inside air side entrance of the damper chamber 4 is collected in the inside air side dust pocket 25. This prevents the casing 1 from entering this gap and obstructing the swinging of the damper 10, thereby ensuring smooth operation of the damper 10.

Next, other embodiments of the above-mentioned dust pocket are shown in Figs. 8 to 15.
This will be explained with reference to the figures.

A second embodiment of the dust pocket 25 is shown in FIGS.
As shown in the figure, each dust pocket 25, 25 is provided with a removable lid 27. This lid body 27 is provided with a plurality of locking claws 27a, and the lid body 27 is attached by engaging these claws 27a with locking holes 26a provided in the peripheral wall 26 of the dust pocket 25, respectively. By removing the dust pocket 27, foreign matter collected in the dust pocket 25 can be removed, and the inside of the dust pocket can be easily cleaned.

Further, FIGS. 10 and 11 show a third embodiment, in which the lid 27 of each dust pocket 25 has a single-opening structure. That is, the upper end side located above each lid body 27, 27 is fixed with a rivet, screw, etc.
The lower end side located on the lower side is hooked on and supported by a locking piece 31 protruding from the outer surface of the housing 1. Therefore, by removing the lower end side of the lid body 27 from the locking piece 31, foreign matter inside the pocket 25 can be easily removed. Note that 27a is a handle for removing the lid body 27.

Next, in a fourth embodiment shown in FIG. 12, the lids 27, 27 of the third embodiment are integrally formed to form a -2 lid structure. That is, the lid body 32 is formed in a band shape that can cover from the inside air side to the outside air side dust pockets 25, 25, and the inside air side dust pockets 2 of the lid body 32 are covered.
5 is fixed to the casing 1 with rivets or the like, and on the other hand, the upper end of the outside air side dust pocket 25 of the lid 32 is hooked on the locking piece 31. Further, a protrusion 33 protruding from the casing 1 is provided in the middle part of the lid body 32.
A hole 34 is provided which fits into the hole 34, thereby making it easy to position the lid 32.

In this embodiment, the foreign matter in both dust pockets 25, 25 can be removed by removing the lid 32 twice.

Furthermore, the embodiment shown in FIGS. 13 to 15 has a structure including a filter 36 and a brush 37 in addition to the first embodiment. That is, a dust filter 36 is attached to the damper inlet 14, and the inside air inlet 2 of the casing 1
At this boundary part IB of the outside air inlet 3, a brush 37 connects its working part 37a to the filter 36, as shown in FIG.
It is attached so that it can be slidably contacted. Therefore, in this embodiment, when the damper 10 is switched from introducing outside air to introducing inside air, the dust attached to the filter 36 at the time of introducing outside air is swept away by the brush 37, and the dust on the side wall 13 of the damper 10 is
The dust passes through the top and is collected in the dust pocket 25 on the outside air side. On the other hand, when switching from inside air introduction to outside air introduction, the deposits on the filter 36 at the time of inside air introduction are swept away by the brush 37 and naturally fall into the inside air side dust pocket 25. In this way, in this example, it is possible to reliably remove the dust that is sucked in each time of introduction, and furthermore, the work of cleaning the filter can be omitted.

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.
This gap between both sides of the damper chamber 4 and the damper chamber 4 is 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 13 of the damper 10, and the gap between both sides of the damper inlet 14 and the damper chamber 4 is sealed by the seal members 17a and 17b. The gap between the wall portion and the damper chamber 4 is sealed by an annular sealing member 18, and the damper inlet 14
Only inside air is introduced through the inside air introduction port 2. In this case, since the front wall near the damper inlet 14 is sealed by the sealing member 18, internal air is prevented from entering the case gap, and 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 inlets 2 and 3 flows through the inclined portion of the wall portion 11 and the curved portion 13 of the side wall portion 13.
The flow direction is smoothly changed by the bell-mouth shaped curved portion 15a, 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 flow path inside the damper 10 becomes smooth due to the sloped portion and the bellmouth-shaped curved portion, so that the flow resistance is reduced and the suction efficiency of the fan 8 is increased. 5. During this period, the flow path shape does not change, so the introduction state is stabilized. In addition, the damper 10 removes foreign matter that has entered from the outside air inlet 3 or the inside air inlet 2 when inside air is introduced or outside air is introduced.
Since the dust is collected in each dust pocket 25 as the dust is switched and oscillated, it is possible to eliminate interference with damper operation caused by foreign matter that has entered between the damper 10 and the casing 1.

Although the present embodiment has been described with reference to a case in which 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. Further, although the materials for the casing, damper, lid of the dust pocket, etc. are not described above, it goes without saying that they can be made of iron plates or resins such as plastics.

(Effects of the Invention) As explained above, according to the present invention, since the cylindrical damper is swingably provided between the inside and outside air intake port and the fan suction port, when both inside air and outside air are introduced, The introduced air flows through the flow path inside the damper, and the shape of the flow path does not change depending on when inside air is introduced and when outside air is introduced, as in the past, and the flow resistance becomes stable and the flow inside the duct is improved. By appropriately setting the flow path, an ideal flow path shape can be obtained, and an improvement in suction efficiency due to a reduction in flow resistance can be expected. Further, since the bellmouth-shaped curved portion can be provided integrally with the damper, it is possible to contribute to a reduction in the number of parts that are conventionally required, such as forming them separately. Furthermore, by providing dust pockets on the side walls of the casing that face both walls of the damper, foreign matter that accumulates at each inlet as the damper switches and swings can be collected in each dust pocket, preventing foreign matter from entering gaps. It is possible to eliminate the obstacles to the swinging motion of the damper caused by this, and ensure smooth operation of the damper.

[Brief explanation of the drawing]

1 to 7 show a first embodiment of the present invention.
The figure is a front sectional view of the intake unit, Figure 2 is a view of the intake unit in the direction of the II arrow in Figure 1, Figure 3 is a view of the intake unit in the direction of the ■ arrow in Figure 1, and Figure 4 is a perspective view of the damper. Figure 5 is a front view of the damper, Figure 6 is a side sectional view of the damper, Figure 7 is a plan view of the damper, Figures 8 and 9.
The figures show a dust pocket according to a second embodiment, FIG. 8 is a plan sectional view thereof, FIG. 9 is a perspective view thereof, FIGS. 10 and 11 show a dust pocket according to a third embodiment, Fig. 10 is a plan sectional view, Fig. 11 is a perspective view, and Fig. 1
Figure 2 is a perspective view showing a dust pocket according to the fourth embodiment;
13 to 15 relate to the fifth embodiment, in which FIG. 13 is a plan sectional view showing the filter, FIG. 14 is a perspective view of the brush,
FIG. 15 is a perspective view of the filter. 1...Casing IA...Casing side wall 2.3...Inside air and outside air inlet 5...Fan suction port 10...Damper 13...
・Damper side wall 14...Damper inlet 15...Damper outlet 25
...Dust Pocket Patent Applicant: Diesel Equipment Co., Ltd.

Claims (1)

[Scope of Claims] 1) An inside/outside air switching device for an intake unit that selectively switches between air inside and outside the vehicle interior and sucks the selected air using a fan, the casing having a plurality of inside air inlets and outside air inlets. A fan suction port is provided, and the casing has a damper outlet constantly communicating with the fan suction port on the proximal end side, and a damper inlet on the tip end, and this damper inlet is an inlet port on the inside air side or outside air side. An intake unit characterized in that a cylindrical damper that selectively communicates with the intake unit is provided so as to be swingable around the damper outlet, and a dust pocket is provided on the side wall of the casing that faces the side wall of the damper. Ki switching device. 2) The internal/external air switching device for an intake unit according to claim 1, wherein the dust pocket has a removable lid.