JPH10103299A - Blower with filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reusable filter in which a pressure loss can be reduced compared with a prior art. SOLUTION: A blower comprises a suction port disposed within a suction passage and formed so as to surround an output shaft 3 near the output shaft 3 of a drive motor 1, a lot of hollow air passages 33 whose one end is for the suction port and having a curved radial arc shape in a direction opposite to the rotating direction toward the other end, a member which surrounds the air passages 33 and constitutes at least one face as a whole. The hollow air passages 33 are provided with a face filter 30 whose cross section becomes large as it approaches outside from the suction port side and formed by bending in the rotating direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a blower with a filter.

[0002]

2. Description of the Related Art In high-performance electronic equipment such as recent electronic computers, it is general to forcibly ventilate the air using a blower in order to maintain predetermined characteristics. In this case, in order to prevent dust and oil (mist) on the fine particles floating in the air from entering the inside of the electronic device, a surface filter is used as a dust removing means, and thereby the air in the air taken into the device is removed. It removes dust and mist, and supplies clean air.

FIG. 10 shows a conventional example of such a blower with a filter. In this blower with a filter, a blade 2 for blowing air into the inside of the device is attached to an output shaft 3 of a drive motor 1. A surface filter 5 is fixedly arranged on the front surface of the blade 2 so as to cover the suction port 6 of the apparatus. In this case, the surface filter 5 is generally manufactured using filter paper, filter cloth, foamed resin, or the like.

[0004]

However, in the conventional blower with a filter having such a configuration, since the surface filter 5 is formed of the filter paper, the filter cloth, the resin, or the like as described above, it is carried along with the air flow. Once the dust 7 and oil on the fine particles adhere to the surface filter 5 and cause clogging, it cannot be cleaned and reused, which is uneconomical.

In order to solve such a problem, the present applicant has proposed a filter-equipped blower provided with a surface filter in which a large number of thin metal wires are radially stacked (Japanese Utility Model Application No. 5-73346). ). In such a blower with a filter, when the surface filter is clogged, by blowing compressed air or water, it has an advantage that it can be easily returned to the original clean state and reused, Since the metal wire acts as an obstacle to the airflow, there is a problem that the pressure loss is large and the blowing performance is low.

As another method, the applicant of the present invention has proposed a method shown in FIG.
As shown in FIG. 1, a surface filter composed of a disk 11 and a plurality of pipes 12 radially disposed on the front surface of the disk 11 with an inner end side opening 12a separated from a rotation center 13 No. 15 was proposed (Japanese Patent Application No. 6-105052). The blower with the filter having such a configuration can be reused by washing and is economical, and has various effects such as higher dust removal performance than the conventional structure. Front plate 17
As shown in FIG. 12, the air flow taken in from the air inlet 17a opened at the center of the pipe is guided into the apparatus through an air passage bent twice at right angles, and the diameter of the pipe 12 is long. Because of the uniformity in the vertical direction, a considerable pressure loss was caused in the pipe 12, and the desired air blowing performance could not be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. It is an object of the present invention to increase the efficiency of both the forced air cooling and the filter effect as compared with the prior art, and to reduce the pressure loss caused by the surface filter. An object of the present invention is to provide an air blower with a filter that can be used as many times as possible while washing the filter while minimizing the filter.

[0008]

According to the present invention, there is provided, in accordance with the present invention, a drive motor and a surface filter mounted on an output shaft of the drive motor. A suction port formed near the output shaft of the drive motor and so as to surround the output shaft; and a radiant flow having one end facing the suction port and curved toward the other end in a direction opposite to the rotation direction. A plurality of hollow air passages having an arcuate shape and arranged around the output shaft, and a member surrounding the hollow air passages and constituting at least one surface as a whole, and the hollow air passages are provided with an air intake passage. Provided is a blower with a filter, wherein the blower with a filter has a cross-sectional area that increases from the mouth side to the outside and is formed by being bent in the rotation direction.

With this configuration, after the air taken in from the air inlet is taken into the hollow air passage, the flow velocity becomes slower as the cross-sectional area becomes gradually larger, and is discharged in the peripheral direction in the rotational direction. Therefore, there is an effect that the pressure loss in the hollow air passage and in this portion can be reduced. If a guide member for guiding the air flow to one end of the hollow air passage is provided at the intake port, turbulent flow at the intake port portion can be prevented, and pressure loss at this portion can be reduced.

The hollow air passage constituting the surface filter may be formed in one plate by a method such as die-cutting, or may be formed by forming a groove in an opposing surface and joining the hollow air passage. A laminated structure of plate materials to be formed may be used. The cross-sectional shape of the hollow air passage is elliptical,
Needless to say, the shape may be a circle, a triangle, a rectangle, an arbitrary shape, or a combination of these shapes in the length direction.

Further, by using the blower with a filter of the present invention, the hollow air passage can be easily cleaned by blowing air or cleaning water, and can be used many times, which is economical. Further, according to the present invention, by providing the mist collecting groove on the inner surface of the fan case, it is possible to reliably collect particulate oil and the like. Further, the hollow air passage having a cross-sectional shape other than a circular shape promotes turbulence of the air flow in the passage, and increases the frequency of dust, oil, etc. hitting the inner peripheral surface of the hollow air passage. Improve performance. Further, by providing a projection or a spiral plate in the passage, various effects such as forcible turbulence of the airflow in the passage can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 shows one embodiment of a blower with a filter according to the present invention, and FIGS.
FIG. 2C shows an example of the surface filter shown in FIG. In these figures, reference numeral 20 denotes a fan case. The fan case 20 is horizontally disposed as shown in FIG. 2A, and is made of a known material such as resin or metal. The cylindrical body 20A and the inner cylindrical body 20B are integrated to form a double cylindrical body. Outer cylinder 20A
Is a cylindrical body having an open front surface, a front end of which is fitted into a suction port 21a of a substrate 21 such as an apparatus main body, and a mounting flange portion integrally formed over the entire outer periphery of the front surface of the front end. 22 is fixed to the substrate 21 by a plurality of bolts (not shown). A semicircular or other mist collecting groove 2 is formed in the lower portion of the inner peripheral surface of the outer cylindrical body 20A.
3 is formed over the entire length in the axial direction, and a mist drain 24 protruding downward is connected to the mist collecting groove 23. The mist drain 24 is connected to the upper end of a pipe 25 connected to the outside of the apparatus, and is configured so that dust 7 or oil or the like accumulated in the mist collection groove 23 is sent out through the mist drain 24. I have.
The inner tubular body 20B is a tubular body that is shorter than the outer tubular body 20A and is open to the back side, and is connected at the rear end to the above-described rear end of the outer tubular body 20B via the connection plate 26. .
The connecting plate 26 is provided with a plurality of air holes 27 for communicating the inside of the device and the inside of the fan case 20 on the same circumference at equal intervals or at appropriate intervals. This vent hole 27
Is circular, elliptical or any other shape. The drive motor 1 is inserted from behind and fixed inside the inner cylindrical body 20B by an appropriate method.

The output shaft 3 of the drive motor 1 is
0B, which projects through an insertion hole 29 provided at the center of the front plate 28 into the outer cylindrical body 20A, and is provided at the end of the output shaft 3 of the drive motor 1 at which the surface filter is characterized by the present invention. 30 is inserted, and is firmly fixed to the output shaft 3 by the fixture 32A. The surface filter 30 includes a front plate 31 and a rear plate 32 which face each other in parallel at predetermined intervals in front and rear, and a large number of hollow air passages 33 or hollow air passages radially between the front plate 31 and the rear plate 32. The member forming 33 is arranged. The front plate 31 is formed in a ring shape and has an air intake 35 at the center. The rear plate 32 is formed in a disk shape, has substantially the same outer diameter as the front plate 31, and has a hole 32B in the center into which the output shaft 3 of the drive motor 1 is inserted or screwed. In addition, the front plate 31 and the rear plate 3 constituting the surface filter 30
2 is entirely formed of an insulating material such as plastic or a metal material such as aluminum, and the plurality of hollow air passages 33 are each formed of an insulating material such as plastic or a metal material such as aluminum. ing. When each of the hollow air passages 33 is formed of a pipe material, the periphery of the pipe material is filled with a filler or an adhesive. When forming from a plate material,
The hollow air passage 33 is formed in the plate surface direction of the plate material by using a known method such as die cutting.

Each of the hollow air passages 33 is formed as shown in FIG.
As is well shown by (b) and (c), the cross-sectional shape (cross-sectional area) gradually increases from the portion near the air inlet 35 toward the outer periphery, reaches its maximum at the outer peripheral edge, and faces outward. In. Each hollow air passage 33 is formed so that one end faces the air inlet 35 and has a radial arc shape curved toward the other end in a direction opposite to the rotation direction R. In the embodiment shown in FIGS. 2B and 2C, an example is shown in which the cross-sectional shape is changed from a circle to an ellipse, but as shown in FIGS. May be changed to another cross-sectional shape such as a triangle or a square (rectangle). Also, the shape of the portion of the hollow air passage 33 near the air intake is not limited to a circle, but may be any shape such as an ellipse, a triangle, and a square (rectangle). It should be understood that FIGS. 3A and 3B show two hollow air passages as representatives so that the overall shape can be understood. Alternatively, the diameter may be gradually increased toward the outlet direction while keeping one shape, for example, circular. When the shape of the hollow air passage is summarized, the cross-sectional shape increases outward from the rotation center of the surface filter 30 of the air intake, and the planar shape is a radial arc-shaped line curved in a direction opposite to the rotation direction. Any combination of shapes may be used.

As shown in FIGS. 2B and 2C, the hollow air passage 33 constituting the surface filter 30 is generally formed in a multilayer structure.
Needless to say, a random arrangement that is not aligned in the thickness direction may be used. Further, as the hollow air passage 33,
As described above, it is possible to use a cross-section having an appropriate cross-sectional shape such as a circle, a triangle, and a square (rectangle). It is desirable to use. The reason is that when the cross-sectional shape is other than circular, the air flow that has flowed into the hollow air passage 33 is more likely to be turbulent inside than when it is circular, and when turbulent, the air flow This is because the frequency of dust 7, mist, and the like contained therein hitting the inner wall surface of the hollow air passage 33 increases. In order to form a turbulent flow, as shown in FIG. 4, a plurality of projections 40 are regularly or irregularly provided on the inner peripheral surface of the hollow air passage 33, or as shown in FIG. The spiral plate 41 may be inserted as described above. In the case of the spiral plate 41, since the air flow spirals along the surface thereof, the air flow does not become turbulent, but the centrifugal force acts, so that the dust 7 and the like contained in the air flow are brought to the outside. Therefore, in this case, the dust removing performance of the surface filter 30 can be improved.

As is apparent from FIG. 1, a cover 43 is attached to the front of the fan case 20 in this embodiment. The cover 43 includes a ring-shaped disk 44 having an outer peripheral portion fixed to the front surface of the mounting portion 22 of the outer cylindrical body 20A, and a cylindrical body 45 fixed to a central hole of the disk 44.
The inner diameter of the cylindrical body 45 is set to be substantially equal to or larger than the hole diameter of the air inlet 35 of the front plate 31 constituting the surface filter 30.

When the drive motor 1 of the blower with a filter having such a configuration is driven, the surface filter 30 attached to the output shaft 3 rotates with the rotation of the output shaft 3 of the drive motor 1. At this time, the outer peripheral side of the hollow air passage 33 constituting the surface filter 30 is turned into a negative pressure by rotation, whereby the air 50 outside the apparatus becomes an air flow and is sucked into the fan case 20. The sucked air flow 50 is guided into the hollow air passage 33 from the air inlet 35 of the front plate 31 of the surface filter 30, further proceeds in the hollow air passage 33, and is discharged radially outward. .
At this time, the airflow 50 including the dust 7, mist, etc., which has entered the hollow air passage 33, has a gradually increasing cross-sectional shape and a radial direction along a radial arc-shaped shape curved in a direction opposite to the rotation direction. To be released tangentially from the outer peripheral end. Since the airflow 50 passes through the hollow air passage 33 having the above-described shape, the airflow 50 is discharged from the outer peripheral end in a tangential direction without receiving a pressure loss as compared with the conventional passage having the same cross-sectional shape, and the dust 7, mist, and the like are removed from the passage wall. The airflow 50 is decelerated from the speed of the airflow 50 while colliding with the airflow, and is discharged radially from the outer peripheral end by the centrifugal force due to its own weight.

By utilizing the fact that the direction of emission of the airflow 50 and the dust 7, mist, etc. from the outer peripheral end of the surface filter 30 is different, only the dust 7, mist, etc. are separated from the airflow. Separated dust 7, particulate oil obtained from the mist, and the like are guided to the mist collection groove 23 while colliding with the inner wall of the outer cylinder 20 and turning in the circumferential direction. Surface filter 3
The air flow 50 discharged from the outer cylinder 2 circulates and moves while colliding with the outer cylinder 20 to form the outer cylinder 2 forming the fan case 20.
The air flows in the space between the inner cylinder 0A and the inner cylinder 20B in the rearward direction, and is guided from the ventilation hole 27 to the inside of the apparatus as an airflow 50 ′.

The dust 7, fine oil, and the like guided into the hollow air passage 33 may adhere to the inner peripheral surface of the hollow air passage 33. However, when the thickness or the amount of the dust 7 or the like becomes a fixed amount (determined by the rotation speed of the surface filter 30 and the weight of the dust or the like), the dust 7 is scattered and removed in a tangential direction by centrifugal force, and To fall. Therefore, clogging of the surface filter 30 is small, and the cross-sectional area of the hollow air passage 33 increases from the intake port to the discharge port, so that the pressure loss is small and the blowing performance of the blower can be improved.
In addition, it was confirmed that the surface filter 30 according to the present invention can obtain dust removal performance equivalent to that of a conventional surface filter made of filter paper, filter cloth, resin, and the like.

The particulate oil adhering to the inner peripheral surface of the fan case 20 slides down along the inner peripheral surface to form a mist collecting groove 23.
Mist drain 24 and pipe 25
Through the fan case 20.

If the surface filter 30 needs to be cleaned, the surface filter 30 may be removed from the drive motor 1 and the inside of the hollow air passage 33 may be cleanly cleaned with compressed air or cleaning water. It can be used.

In the above-described embodiment, the air flow 50 is formed only by the surface filter 30, but it may be used as shown in FIG. 6 in combination with the wings 42 forcibly generating the air flow. Of course.

In the present embodiment, the suction port side of the hollow air passage 23 only faces the space on the ring connected to the air intake port 35 of the front plate 31.
As shown in (a) and (b), guide members 61 and 62 forming arcuate passages for guiding air smoothly from the air inlet 35 of the front plate 31 toward the hollow air passage 33 are arranged. You may. The guide member 61 is provided for each layer of the hollow air passages 33 arranged in multiple layers, and the guide member 62 is provided only at the lowermost stage of the hollow air passage 33 (a portion close to the rear plate 32). If you do this,
Turbulence at the entrance of the hollow air passage 33 is reduced,
The air flow 50 can be effectively guided into the hollow air passage 33 having a filter function.

In the above embodiment, the fan case 20 is used.
The case where the mist collection groove 23 is formed in the lower part of the inner surface in the axial direction has been described. However, the present invention is not limited to this. For example, a stitch-like or diagonally and annular groove is formed on the inner circumferential surface of the case, Mist drain 2 through this groove
4.

Further, in the above embodiment, the case where the surface filter 30 is incorporated in the fan case 20 has been described. However, basically, the fan case 20 is not necessarily required. A motor provided on the output shaft 3 of the motor 1 is used as a unit. As the configuration of the surface filter 30 at this time, the front plate 31 is not always necessary, and a circular plate corresponding to the rear plate 32 and the whole or a part of the front surface of the circular plate are provided with the inner end side opening from the center of rotation. What is necessary is just to comprise the member which has a plurality of hollow air passages arranged at least one step radially apart from each other. Even in such a configuration, the drive motor 1
When the output shaft 3 is rotated by the driving of the air, the air in the hollow air passage is discharged to the outside from the outer opening by the centrifugal force, so that the inside of the hollow air passage becomes negative pressure, and the air flow flowing into the hollow air passage. Is generated, the surface filter itself can have a function as a fan.

FIG. 8 shows another embodiment of the surface filter 30. In this embodiment, the surface filter 30 is constituted by coaxially laminating five disks 70a to 70e. . The surface filter 30 includes an air inlet 72 provided at the center of the front surface, and a plurality of passages formed radially and having an inner open end communicating with the air inlet 72 and an outer open end opening to the outer periphery of the surface filter 30. 73 are provided.
The inner diameters of the four disks 70a to 70d are the same, and this portion forms the air intake 72. The disk 70
As is well shown in FIG.
Part of the hollow air passage 33 is formed such that its cross-sectional area increases in the radial direction and outward from the intake port side and is bent in the rotational direction. The remaining disc 70e does not have a groove, and a boss 77 that fits with the output shaft of the drive motor 1 is integrally provided at the center of the inner surface.

The surface filter 30 having such a structure can have a blowing function and a dust collecting function similarly to the surface filter in the above-described embodiment. That is, when the surface filter 30 is rotated, the hollow air passage 3
3 is tangentially released by centrifugal force, so that the inside of the air suction port 72 becomes negative pressure, and the outside air is sucked into the air suction port 72 and tangentially passes through the hollow air passage 33. Released. When passing through the hollow air passage 33,
Dust 7, oil, etc., contained in the air are supplied to the hollow air passage 3
3 adheres to the inner surface or is emitted radially,
It is collected in the mist collection groove by its own weight.

[0028]

As described above, according to the blower with the filter of the present invention, the intake port formed so as to surround the periphery of the output shaft near the output shaft of the drive motor;
A large number of hollow air passages arranged around the output shaft with a radial arc-shaped shape facing one end of the intake port and curved in a direction opposite to the rotation direction toward the other end, and these air passages; A member which surrounds the periphery of the filter and constitutes at least one surface as a whole, and wherein the hollow air passage has a cross-sectional area that increases from the intake port side to the outside and is formed by being bent in the rotational direction. Since the air taken in from the air inlet is taken into the hollow air passage, the flow velocity decreases as the cross-sectional area gradually increases, and the air is discharged in the rotating direction at the periphery, so that the hollow air passage No turbulent flow is generated at the outlet portion, and the pressure loss in this portion and in the hollow air passage can be reduced. Further, if a guide member for guiding the air flow to one end of the hollow air passage is provided at the intake port, turbulent flow at the intake port portion can be prevented, and pressure loss at this portion can be reduced.

Further, if the blower with a filter of the present invention is used, the hollow air passage can be easily cleaned by blowing air or cleaning water, and can be used repeatedly, and is economical. Further, according to the present invention, since the mist collecting groove is provided on the inner surface of the fan case, it is possible to reliably collect particulate oil and the like. Further, the hollow air passage having a cross-sectional shape other than a circular shape promotes turbulence of the air flow in the passage, and increases the frequency of dust, oil, etc. hitting the inner peripheral surface of the hollow air passage. Improve performance. Further, by providing a projection or a spiral plate in the passage, the air flow in the passage can be forcibly made turbulent.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a blower with a filter according to the present invention.

2A, 2B, and 2C are a partially cutaway plan view, a main part front view, and a main part rear view showing a specific structure of an example of the surface filter shown in FIG. .

FIGS. 3A and 3B are diagrams showing a modification of the hollow space passage.

FIG. 4 is a sectional view showing another modification of the surface filter.

FIG. 5 is a perspective view illustrating another modification of the surface filter.

FIG. 6 is a sectional view showing another modification of the present invention.

FIGS. 7A and 7B are cross-sectional views showing another example of the surface filter.

FIG. 8 is a perspective view showing another modification of the surface filter.

9 is an enlarged sectional view of a main part of FIG.

FIG. 10 is a side view of a conventional blower with a filter.

FIG. 11 is a partially cutaway plan view showing another example of a surface filter used in a conventional blower with a filter.

FIG. 12 is a diagram for explaining the operation of FIG. 11;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drive motor, 2 ... Blade, 3 ... Output shaft, 4 ... Blower,
7: dust, 20: fan case, 20A: outer cylinder, 20
B: inner cylinder, 21: substrate, 21a: suction port, 22: mounting flange, 23: mist collecting groove, 24: mist drain, 26: connecting plate, 28: front plate, 30: surface filter,
31 front plate, 32 rear plate, 32A fixture, 32B
Holes, 33: hollow air passage, 35: air intake, 40: projection, 41: spiral plate, 42: blade, 43: cover, 44:
Disk, 45 ... cylindrical body, 50, 50 '... air flow, 61, 62
... Guide members, 70a to 70e. Discs, 72. Air intakes, 73. Passages.

Claims (8)

[Claims] 1. A surface filter disposed in an intake passage and attached to an output shaft of a drive motor, wherein the surface filter is provided at a portion near the output shaft of the drive motor and surrounding the output shaft. A plurality of hollow air arranged around the output shaft with a formed intake port and a radial arc-shaped shape whose one end faces the intake port and is curved toward the other end in a direction opposite to the rotation direction. A passage, and a member surrounding the air passages and constituting at least one surface as a whole, wherein the hollow air passage has a cross-sectional area that increases outward from the intake port side and is bent in the rotational direction. A blower with a filter characterized by being formed. 2. Each of the hollow air passages is constituted by at least two layers of laminated plate members, and grooves or patterns constituting the hollow air passages are respectively formed on opposing surfaces of each plate member. The blower with a filter according to claim 1, wherein 3. The blower with a filter according to claim 1, wherein each of the hollow air passages is formed by die cutting. 4. The blower with a filter according to claim 1, wherein said hollow air passage is formed by being laminated in a thickness direction of a surface filter. 5. The blower with a filter according to claim 1, wherein the hollow air passage has a cross-sectional shape other than a circular shape. 6. A blower with a filter according to claim 1, wherein said hollow air passage has a spiral plate disposed therein. 7. The blower with a filter according to claim 1, wherein said air passage has a continuously changing cross-sectional shape from an inlet to an outlet. 8. The blower with a filter according to claim 1, wherein the output shaft of the drive motor is provided with a blade in addition to the surface filter.