JPH0357716A - Air purifying device for vehicle - Google Patents

Abstract

PURPOSE:To miniaturize an air purifying device and to improve its purifying capacity by arranging a filter adjacently to an internal intake and making a diameter of the intake larger than an outside diameter of a blast fan. CONSTITUTION:A filter 3 is arranged adjacently to an internal intake 6 and fixed to a filtercasing 2, and the diameter of the internal intake 6 is made larger than that of a blast fan 8. In addition, an external intake 1 and the internal intake 6 are made nearly equal in their diameters, and a filter casing 2 is formed to have a diameter larger than the internal intake 6. This formation widens the blast area of the filter 3 and reduces air speed. Thus the dust collecting efficiency of the filter can be improved, and moreover an air purifying device miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air cleaning device for a vehicle, and more particularly to an air cleaning device for a vehicle that has enhanced cleaning ability and is compactly constructed.

[Prior art] As prior art related to a vehicle air purifying device or a similar device, Japanese Patent Laid-Open No. 60-67217 and Japanese Patent Laid-open No. 6
No. 2-155117 exists.

JP-A No. 60-67217 discloses an air purifying device for an automobile, and this air purifying device has a structure in which an air purifying filter is disposed at a location relatively far from the fan and on the downstream side of the fan. . Furthermore, Japanese Patent Application Laid-Open No. 155117/1983 discloses an air conditioner for automobiles, and this air conditioner has the following features:
A circulating air flow path is formed in which at least a fan and a deodorizing member substantially having a filter function exist, and the fan and the deodorizing member are arranged at a relatively distant position in the circulating air flow path.

[Problems to be Solved by the Invention] In the air purifying device disclosed in Japanese Patent Application Laid-open No. 60-67217, the filter is installed downstream of the fan and away from the fan, resulting in an overall large size. It is not desirable as such. In addition, the diameter of the suction port formed just before the upstream side of the fan is smaller than the outside diameter of the fan and is approximately equal to the inside diameter, so that the diameter of the airflow flux is the same as the diameter of the suction port. limited by diameter. Further, due to the shape of the downstream scroll section that guides the air flow, the flow velocity of the air in the fan discharge section varies depending on the location, causing a bias in the flow velocity passing through the filter. Due to these factors, the passing area of the airflow in the filter is small and the passing flow rate is high, and the passing flow rate varies depending on the passing place, so the entire filter cannot be used effectively, resulting in problems such as poor dust collection efficiency. was.

On the other hand, in JP-A No. 62-155117, a circulation path is specially provided and the deodorizing member is arranged within it, so the overall shape becomes large, and this structure cannot be made compact. .

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide an air purifying device for a vehicle that has extremely high dust collection efficiency and can be formed into a compact size that is optimal as a device for a vehicle.

[Means for Solving the Problems] The vehicle air purifying device according to the first aspect of the present invention includes an air purifying filter between an external suction port facing the interior of the room and an internal suction port located upstream of the blower fan. In the air purifying device for a vehicle, the filter is disposed close to the internal suction port, and the internal suction port is configured to have a diameter larger than the outer diameter of the blower fan.

A vehicle air purifying device according to a second aspect of the present invention includes an external suction port facing into a room, a blower fan, an internal suction port located upstream of the blower fan, and an air purifying filter. In the cleaning device, the diameter of the internal suction port is substantially equal to the outer diameter of the blower fan, the casing portion forming the internal suction port is extended in the axial direction to form a space, and the filter is installed in this space. configured to arrange.

[Operations] In the first aspect of the present invention, by making the diameter of the internal suction port located upstream of the blower fan larger than the outer diameter of the blower fan, the ventilation area in the filter is increased and the wind speed is reduced. This increases the dust collection efficiency of the filter. Also, the close arrangement makes the overall shape more compact.

In the second aspect of the present invention, the diameter of the internal suction port is made substantially equal to the outer diameter of the blower fan, and the filter is accommodated in the space formed in the internal suction port.
For the same reason as the first invention, the collection efficiency of the filter can be increased, and the shape of the device can be made even more compact.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a first embodiment of the present invention, with FIG. 1 being a vertical sectional view showing the internal structure, and FIG. 2 being a bottom view thereof. In FIG. 1, reference numeral 1 denotes an external suction port facing the passenger compartment of an automobile, etc., this external suction port 1 is formed in a filter casing 2, and a filter 2 is disposed close to the inside of the external suction port 1. Ru.

4 is a blower, and a filter casing 2 is fixed to a casing 5 of the blower 4. The casing 5 of the blower 4 consists of a scroll portion 5A and a duct portion 5B that are configured separately, and these two parts are connected and integrated as a blower casing. Scroll portion 5A of blower casing 5 located downstream of filter 2
A bellmouth-shaped internal suction port 6 is formed at the location.

Internal suction port 6 is located close to filter 2 .

Reference numeral 7 denotes a motor, and the motor 7 is fixed to the lower wall surface of the blower 4 in FIG. 1, and a multi-blade centrifugal fan 8 is attached to its output shaft. A power source that supplies power to the motor 7 is omitted in the figure. The fan 8 has an almost cylindrical shape as a whole,
One end face faces the internal suction port 6 in close proximity. Thus, the fan 8 is arranged close to the filter 3. As mentioned above, the overall shape of the fan 8 is approximately cylindrical, and the circular outline of the fan 8 is shown by a broken line in FIG.

In the above, the diameter of the suction port 6 is larger than the outer diameter of the fan 8. Further, the diameters of the external suction port 1 and the internal suction port 6 are formed to be approximately equal,
Moreover, the diameter of the filter 2 is formed to be larger than the diameter of the internal suction port 6. Line 9 in FIG. 1 and broken line 9 in FIG. 2 indicate the scroll portion 5A and the duct portion 5B, respectively.
It shows the connection boundary line between the scroll part 5A and the duct part 5.
B are connected and together form the air flow path on the downstream side.

10 is an air outlet, and this air outlet 10 is formed at one end of the duct portion 5B. The air outlet 10 is arranged facing the passenger compartment of the automobile. The external suction port 1 and this air outlet 10 are located in the same plane. Based on this positional relationship, if this air purifying device is installed, for example, in a parcel section of a rear seat of an automobile, the air outlet 10 and the external suction port 1 are arranged on the same wall surface of the parcel section. Further, the main body of the cleaning device is housed in the trunk compartment.

In the automobile air purifying device having the above configuration, when the motor 7 is driven, the fan 8 rotates, thereby sucking air from the vehicle interior through the external suction port 1. Air taken in from the external suction port 1 passes through the filter 3, the internal suction port 6, the scroll portion 5A, and the duct portion 5B, and then reaches the discharge port 1.
From 0, it is returned to the vehicle interior. During this passage of the vehicle interior air, the filter 3 removes dust and the like from the air.

In this way, the dirty air in the vehicle interior is purified by the filter 3 and returned to the vehicle interior, and this circulation action is continued.

Here, the characteristics of the air cleaning device having the above structure will be explained while comparing with the conventional technical structure. FIG. 2 is a graph showing the relationship between the air volume and ventilation resistance of a blower used in an air purifier.
The solid line B shows the performance when the diameter of the internal suction port is the same as the inside diameter of the fan 8 (conventional configuration). As is clear from FIG. 2, the performance is approximately the same in either case. Therefore, no matter which configuration is adopted, the air volume will be the same. As a result, when looking at this in terms of air flow velocity, that is, wind velocity, the wind velocity is inversely proportional to the square of the diameter of the internal suction port, so the configuration of the present invention has a lower wind velocity than the conventional configuration. On the other hand, as shown in the experimental data of FIG. 3, the dust collection efficiency of the filter 3 has a characteristic that it increases as the wind speed decreases. Therefore, according to the configuration according to the first embodiment of the present invention in which the diameter of the internal suction port 6 of the scroll portion 5A is larger than the outer diameter of the fan 8, the filter 3
Since the ventilation area increases and the wind speed decreases, it becomes easier to catch dust and the collection efficiency improves. Furthermore,
The collection efficiency can be further improved by increasing the usage efficiency of the filter 3 due to the increased ventilation area.

Next, a second embodiment of the present invention will be described based on FIGS. 5 to 10. In this embodiment, as shown in FIG. 5, a bellmouth-shaped internal suction port 6' of the scroll portion 5A
The filter 3' is installed directly in the internal space of the filter 3'. Therefore, the internal suction port 6' has a larger axial dimension than the internal suction port 6 so that the filter 3' can be disposed therein. On the other hand, the filter 3' is formed smaller than the filter 3 of the first embodiment. As shown in FIG. 5, the diameter of the internal suction port 6' at the lower end in the figure is approximately equal to or larger than the diameter of the fan 8.

Further, the casing 13, which had the function of a filter casing in the first embodiment, is formed to be dimensionally small since there is no need to arrange a filter therein. The external suction port 1 is provided in the casing 13. The rest of the structure is the same as that of the first embodiment described above.

The mounting structure of the filter 3' will be explained.

As shown in FIG. 8, the filter 3' has a hole 3-a in the center.
It has the shape of a disk and has a predetermined thickness L'. This filter 3' is provided with an upper filter holder 11 and a lower filter holder 12 on the upper and lower surfaces. FIG. 6 shows the planar shape of the upper filter holder 11, and FIG. 20 shows the planar shape of the lower filter holder 12. Each filter holder 11
．． 12 are two wire portions 11A., each bent into a predetermined shape as shown in the drawings. 12A and three presser plates that connect these two wire parts■IB. 12
It consists of B. Each holding plate 11B, 12B has a hole 13, especially the holding plate 1 located in the center of the lower filter holding plate 12.
2 has a nut l4 added to the hole 13 by welding. A sectional view taken along the line ■-I in FIG. 6 is shown in FIG. 7th
As shown in the figure, the presser plate 13 has a bent piece.

When the filter 3' is attached to the internal suction port 6',
As shown in FIG. 5, the holes l3 of the holding plates 11B on both sides of the upper filter holding member 11 engage with the positioning projections l5. The protrusion 15 is fixed to the casing of the scroll portion 5A. Then, the filter 3' is arranged between the upper filter retainer 11 and the lower retainer plate 12, and the hole 13 of the center retainer plate 11B of the upper filter retainer 11 and the hole 3=a of the filter 3' are
Attach a screw 17 using the collar member 16 placed inside and the nut 14, and use this screw 17 to integrate the upper filter holder 11, the filter 3', and the lower filter holder 12, thereby holding the filter 6' inside. Fix it at the suction port 6'. FIG. 9 shows a perspective view of the collar member 16.

A portion of the lower filter holder 12 abuts against the lower edge of the bell mouth portion forming the internal suction port 6'. As shown at 18 in FIG. 5, a part of the lower filter holder 12 is bent to serve as a guide for the bell mouth portion, which has the advantage of ease of assembly.

[Effects of the Invention] As is clear from the above description, according to the first invention,
The filter is placed close to the internal suction port on the upstream side of the blower fan, and the diameter of the internal suction port is larger than the outside diameter of the blower fan, allowing effective use of the filter and improving dust collection efficiency. In addition, the entire device can be made compact, making it ideal as an air cleaning device for vehicles.

4. According to the second invention, the collection ability of the filter can be improved as in the first invention, and furthermore, the space created in the internal suction port formed just before the upstream side of the blower fan can be utilized. Since a small filter is arranged in this way, it can be made into a more compact shape.

[Brief explanation of drawings]

FIG. 1 is an overall vertical cross-sectional view showing a first embodiment of a vehicle air purifying device according to the present invention, FIG. 2 is a bottom view of the device, and FIG. 3 is a diagram showing characteristics according to the configuration of the present invention and characteristics according to the conventional configuration. An explanatory diagram for comparing characteristics, Figure 4 is a characteristic diagram showing the relationship between wind speed and collection efficiency, Figure 5 is a vertical cross-sectional view showing the main part of the second embodiment of the present invention, and Figure 6 is the upper part. FIG. 7 is a sectional view taken along the line II, FIG. 8 is a perspective view of the filter, FIG. 9 is a perspective view of the collar member, and FIG. 10 is a plan view of the lower filter holder. [Explanation of symbols] 1...External suction port 2...Filter casing 3, 3 4 ● ・ 5A● 5B ● 6, 6 7 ・ ● 8 ● ● 10 ● 1 ●●●Finoreta/Blower●●Scroll part・・Duct part′・・Internal suction port・Motor・Multi-blade centrifugal fan・・Discharge port

Claims (2)

[Claims] (1) In a vehicle air purifying device in which an air purifying filter is disposed between an external suction port facing the interior of the room and an internal suction port located upstream of a blower fan, the filter is placed close to the internal suction port. 1. An air purifying device for a vehicle, characterized in that the internal suction port has a diameter larger than an outer diameter of the blower fan. (2) In a vehicle air purifying device comprising an external suction port facing the interior of the room, a blower fan, an internal suction port located upstream of the blower fan, and an air purifying filter, the diameter of the internal suction port is A casing portion having an outer diameter substantially equal to the outer diameter of the blower fan and forming the internal suction port extends in the axial direction to form a space portion, and the filter is disposed in this space portion. An air purifying device for vehicles.