JP5049506B2 - Manufacturing method of filter unit with fan - Google Patents

Description

The present invention relates to a method for manufacturing a fan with filter units used to form a clean space, and more particularly, to a method for manufacturing a fan with a filter unit using the axial flow fan as a fan.

  Conventionally, a fan-equipped filter unit that has a chamber chamber on the upstream side of a filter and in which a fan such as an axial fan is provided in the chamber chamber is known as disclosed in Patent Documents 1 to 3, for example. Yes.

  In Patent Document 1, as shown in FIG. 3, a chamber chamber 120 is provided on the upstream side of the filter 130, and two axial fans 101 and 102 and a terminal block mounting base 103 are provided in the chamber chamber 120. A fan-equipped filter device 100 is disclosed.

  Patent Document 2 discloses a fan filter unit 200 having a chamber chamber 220 on the upstream side of a dust collection filter 230 and a centrifugal fan 210 provided in the chamber chamber 220 as shown in FIG. ing.

  Further, in Patent Document 3, as shown in FIG. 5, a chamber chamber 320 is provided between a filter unit 330 including a filter frame 331, a high-performance filter 332, and a net-like protective member 333 and a prefilter 301. A fan filter unit 300 in which a turbo fan 310 is provided in a chamber chamber 320 is disclosed.

Japanese Utility Model Publication No. 7-13417 JP 2004-52615 A Japanese Patent No. 3637491

However, in the structure of the fan-equipped filter device 100 disclosed in Patent Document 1, the distance between the fan and the resistor, such as the filter and the side wall of the chamber chamber, is reduced from the viewpoint of thinning and compacting the filter unit with the fan. When it is set to a minimum by simple dimension setting, the structural resistance increases, and there is a problem that the air volume of the entire fan-equipped filter unit is lower than desired.
Further, the fan filter units 200 and 300 disclosed in Patent Document 2 and Patent Document 3 have a structure in which the motors 211 and 311 for the centrifugal fan 210 and the turbo fan 310 are installed on the fan case. Therefore, it is necessary to increase the distance between the resistors such as the side walls of the filters 230 and 330 and the chamber chambers 220 and 320 and the fans 210 and 310, and there is a problem that the thickness and size cannot be reduced.

Therefore, the present invention has an object to provide a method of manufacturing a filter unit with a fan that can maintain a desired air volume by reducing the structural resistance of the entire unit while reducing the thickness and size of the unit. To do.

  As a result of earnest research to solve the above problems, the inventor of the present invention has achieved the structural resistance of the entire unit while reducing the thickness and size of the unit by satisfying a predetermined wind speed condition on a predetermined surface. It has been found that a desired air volume can be maintained by reducing the air flow.

That is, the method for producing a filter unit with a fan according to the present invention is a chamber chamber formed of a casing on the upstream side of a filter in which a filter pack is fixed in a filter frame as described in claim 1 to achieve the above object. A filter unit with a fan, in which an axial fan is provided in the chamber, and the fan-equipped filter unit can be made compact while maintaining the air volume of the filter unit with a fan at a desired value. as such, than the distance h between the upper surface of the filter pack shortest distance S corresponding thereto and a bottom surface outer circumferential edge portion of the axial fan in the horizontal direction between the side wall surface of the lower surface outer peripheral end portion of the axial flow fan casing and larger, and each point of the lower surface peripheral edge of the axial-flow fan, and a point having the shortest distance from respective point to the filter pack upper surface When the passing wind velocity passing through the surface composed of line segments in defined and V (m / s), to design the distance h such that the passage wind speed V satisfies the relation 3 <V <6 Features.
Further, in the method for producing a filter unit with a fan according to the present invention, as described in claim 2, a configuration in which a plurality of axial fans are provided in the chamber chamber may be employed.

The method for producing a filter unit with a fan of the present invention includes a chamber chamber formed of a casing on the upstream side of a filter in which a filter pack is fixed in a filter frame, and an axial flow fan provided in the chamber chamber. a manufacturing method of the filter unit, the air volume of the fan with filter unit so that it can compact the filter unit with the fan while being maintained at a desired value, the side of the lower surface outer peripheral end portion of the axial flow fan casing The shortest distance S in the horizontal direction with respect to the wall surface is greater than the distance h between the lower surface outer periphery of the axial fan and the corresponding upper surface of the filter pack, the passage wind speed passing through the surface composed of the line segment defined between the point having the shortest distance from respective point to the filter pack upper surface V When m / s) to, by designing the distance h such that the passage wind speed V satisfies the relation 3 <V <6, it is possible to reduce the loss of air volume due to structural resistance, thereby, the desired It is possible to secure a sufficient air flow. Further, since the distance between the axial fan and the resistor such as the filter or the side wall of the chamber chamber can be set to an optimum dimension that is less affected by the structural resistance, the desired air volume of the filter unit with the fan is secured while Miniaturization can be achieved.
In addition, the method for producing a filter unit with a fan according to the present invention eliminates the need for installing a motor on a fan case base by using an axial fan, thereby reducing structural resistance and ensuring a desired air volume. It becomes.

Furthermore, since the method for producing the filter unit with a fan according to the present invention may have a structure in which a plurality of axial fans are provided in the chamber chamber, each axial fan is provided with each of the outer peripheral end portions of the lower surface of the axial fan. V (m / s) is a passing wind speed passing through a plane composed of a line segment defined between each point and a point that is the shortest distance from each point to the upper surface of the filter pack. By appropriately setting (designing) the number and installation positions of the axial fans so that V satisfies the relationship of 3 <V <6, the necessary air volume can be secured as a whole unit.

Hereinafter, a method for producing a filter unit with a fan of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a fan-equipped filter unit obtained in an embodiment of the present invention, and FIG. 2 is a diagram of a fan-equipped filter unit as shown in FIG. It is a top view which shows an example of arrangement | positioning.

First, the structure of the fan-equipped filter unit 1 shown in FIG. 1 will be described. As shown in FIG. 1, the fan-equipped filter unit 1 includes a fan unit 2 and a filter unit 3.

The fan unit 2 is partitioned by a fan casing 21, and an opening 22 corresponding to the shape of the axial flow fan 10 is provided on the upper surface of the fan casing 21. In addition, one axial fan 10 is provided in the center of the fan casing 21 so that the upper surface portion is directly attached to the opening 22 portion.
The axial fan 10 includes a casing portion 10c having two openings, an air inlet 10a and an air outlet 10b, provided on the upstream side and the downstream side, respectively, and a fan body 10d.

In the fan-equipped filter unit 1 manufactured according to the present invention , one to four axial fans 10 can be used per unit . In particular, by arranging three axial fans 10 as shown in FIG. 2, it is possible to prevent the air speed from being disturbed by suppressing the buffering between the fans, so that the amount of air blown from the fan-equipped filter unit 1 can be reduced. It can be uniform.

The casing 21 is provided with a folded portion 21b that is folded outward at the end (the lower end side in FIG. 1). The folded portion 21b of the casing 21 is brought into contact with a filter frame 32 of the filter unit 3 to be described later via a gasket 5, and the folded portion 21b and the filter frame 32 are fastened and fixed with bolts and nuts (not shown), thereby providing a fan. The unit 2 and the filter unit 3 are integrated. In the filter unit with fan 1 of the present embodiment, the chamber chamber 20 is configured by the inner surface of the fan casing 21 and the filter portion 3 (particularly, a filter pack 31 described later). Here, as the material of the casing 21 , corrosion prevention steel such as stainless steel and galvanium steel plate can be used.

  The filter unit 3 includes an air filter 30 in which a filter pack 31 in which a filter medium folded in a filter frame 32 is folded by a wave-like separator or a ribbon-like separator and fixed by a sealant, and a downstream side of the filter pack 31. And a current plate 4 fixed to the main surface via bolts, nuts, etc. (not shown).

As the air filter 30 produced according to the present invention , a chemical filter for removing molecular contaminants, a dust collection filter for removing dust and airborne bacteria, and the like can be used. The filter frame 32 of the air filter 30 can be made of metal or wooden. Further, the filter material of the filter pack 31 can be used by folding glass fiber paper or synthetic fiber paper, and the filter pack 32 can be made of metal or wooden corrugated separator or hot melt resin. A ribbon material made from the above can be used, and a urethane resin or the like can be used as the seal material of the filter pack 32.
As the current plate 4 used in the present invention, a lath net, a perforated plate or the like can be used.

In the fan-equipped filter unit 1 obtained by the present invention, in order to prevent the turbulent flow of the gas that has flowed into the chamber chamber 20, the axial flow fan 10 that sucks and blows air in the axial flow direction is used. When the axial fan 10 is used as described above, the fan-equipped filter unit 1 can be reduced in size as compared with a case where a sirocco fan is used or a structure where a fan motor is installed on a fan case. it can.

Here, the distance between each member is defined as follows for the description of the Example mentioned later. That is, the outer dimension of the upper surface of the fan casing 21 is D, the outer dimension of the upper and lower surfaces of the axial fan 10 (dimensions of the air inlet 10a and the air outlet 10b) is d, the height of the chamber 20 is H, and the axial fan 10 is. H is the distance between each point on the outer peripheral end of the lower surface and the point on the upper surface portion 31a of the filter pack 31 that is the shortest distance from that point, and the horizontal distance between the lower outer peripheral end of the axial fan 10 and the side wall surface 21 of the casing 21 Let S be the shortest distance in the direction (shortest horizontal distance).
As shown in FIG. 2, when a plurality of axial fans 10 are provided in the fan unit 2, the shortest horizontal distance S is set in each axial fan 10. FIG. 2 shows three axial fans 10 and the shortest horizontal distance S between each axial fan 10 and the fan casing 21. When these axial fans 10 are arranged, the structural resistance as well as the stability of the air flow are considered. Therefore, the axial fans 10 are usually arranged at positions that are generally symmetrical.

  Next, the operation of the fan-equipped filter unit 1 shown in FIG. 1 will be described. When the axial fan 10 is operated (driven), outside air is introduced from the air inlet 10 a of the axial fan 10, and the introduced outside air passes from the air outlet 10 b of the axial fan 10 to the upper surface portion of the filter pack 31. It blows out toward 31a.

  In this case, the filter pack 31 serves as a resistor against the outside air blown from the axial fan 10. However, the filter in which the shortest horizontal distance S in the horizontal direction between the outer peripheral end of the lower surface of the axial fan 10 and the side wall surface 21 of the casing 21 is the shortest distance from each point of the lower outer peripheral end of the axial fan 10 When it is smaller than the distance h from the point of the upper surface portion 31a of the pack 31, the side wall surface 21 of the casing 21 can be a resistor.

That is, the distance h between each point of the lower surface outer peripheral end (πd) of the axial fan 10 and the point of the upper surface portion 31a of the filter pack 31 that is the shortest distance from that point, or the lower outer peripheral end of the axial fan 10 The distance S that is the shortest in the horizontal direction between each point (πd) and the side wall surface 21 of the casing 21 is the minimum distance (shortest distance) for the flow path of the outside air blown out from the axial fan 10 . The structural resistance of the casing 21 of the fan unit 2 is governed by the wind speed of the outside air passing through the minimum flow path.

  Next, the outside air blown out from the axial fan 10 passes through the filter pack 31, and after the outside air is purified by passing through the filter pack 13, it is rectified by the rectifying plate 33 and attached with a fan. Supplied downstream of the filter unit 1.

In the present invention, from the axial flow fan 10 on the surface (that is, the minimum flow path) constituted by the line segment that is the shortest distance from each point on the outer peripheral end of the lower surface of the axial flow fan 10 to the upper surface 31a of the filter pack 31. The parts of the fan-equipped filter unit 1 are arranged so that the passing air velocity V (m / s) of the blown outside air satisfies the relationship 3 <V <6. As described above , the structural resistance is obtained by disposing the parts of the filter unit 1 with the fan so that the wind speed of the outside air passing through the assembly surface (minimum flow path) of the line segment having the shortest distance becomes 3 <V <6. It is possible to reduce the loss of the air volume due to the air flow, thereby ensuring a desired air volume. In addition, since the distance between the axial fan 10 and the filter pack 31 can be set to an optimum dimension that is less affected by structural resistance, the fan unit filter unit 1 can be reduced in size while securing a desired air volume. Can do.

  In this embodiment, as shown in FIG. 1, the end of the casing 21 of the fan part 2 is folded outward to provide a folded part 21 b, and bolts and nuts are provided on the filter frame 32 of the filter part 3 via the gasket 5. Although the fan-attached filter unit 1 having a structure integrated by tightening and fixing has been described, it is not particularly limited to this structure. For example, a structure in which a folded portion obtained by folding the casing 21 of the fan unit 2 inward is fastened and fixed to the filter frame 32 of the filter unit 3 with a bolt and a nut via a gasket 5 may be employed. Moreover, the structure which extended the casing 21 of the fan part 2 without making the fan part 2 and the filter part 3 separate, and fixed the filter pack to the downstream end part of the casing with the sealing material etc. may be sufficient.

Next, regarding the manufacturing method of the filter unit with a fan of the present invention , based on the concrete Example 1 and Comparative Examples 1 and 2 as shown below, the compactness with respect to the housing dimensions of the filter unit with a fan, the filter with a fan The low structural resistance to unit airflow was compared and evaluated.

Example 1
A filter unit with a fan as shown in FIG. 2 was produced. This filter unit with a fan has an outside dimension of the vertical and horizontal 610 □ (D) × height 65 mm (H). In addition, the filter unit with a fan is provided with a filter pack having dimensions of 570 mm in length, 580 mm in width, and 58 mm in height, and three axial fans whose dimensions are φ172 (d) × 51 mm in height. (See Figure 2 for placement). The distance (h) between the outer peripheral end portion of the lower surface of the axial fan and the corresponding upper surface portion of the filter pack is designed to be 24 mm.

In the filter unit with a fan having such a structure, the axial flow fan is operated (driven), the air volume of the outside air blown at that time is measured, and the resistor collision is performed based on the actually measured outside air volume. Later, the outflow rate of outside air was calculated. As a result of the measurement and calculation, the air volume was 9.9 m ³ / min, and the outflow speed was 4.2 m / s.

The air volume of the outside air was measured using a fan air volume measuring device based on JIS B8330. Further, the outflow speed of the outside air after the resistor collision was calculated based on the air volume measured in this way and the volume of the portion serving as the minimum flow path. The formula for the calculation is shown below.
(Outflow velocity after resistor collision) = (Measured air volume) / (Volume of the portion that becomes the minimum flow path)
= (Measured air volume) / [(Fan lower surface outer periphery dimension πd) × (Fan lower surface outer periphery end portion and corresponding filter h upper surface portion h)]

In the first embodiment, the distance S in the horizontal direction between the outer peripheral edge of the lower surface of the axial fan and the side wall surface of the casing is the distance h between the outer peripheral edge of the lower surface of the axial fan and the corresponding upper surface of the filter pack. Is assumed to be larger. The same applies to the following comparative examples.
Moreover, the air volume of the filter unit with a fan which becomes a standard (target) when such a filter unit with a fan is configured is 9.5 m ³ / min.

(Comparative Example 1)
A fan-attached filter unit was produced in the same manner as in Example 1 except that the distance (h) between the outer peripheral end of the lower surface of the axial fan and the corresponding upper surface of the filter pack was 14 mm. And using the produced filter unit with a fan, while measuring the air volume of external air, the outflow speed after a resistor collision was calculated. As a result of the measurement and calculation, the air volume was 8.7 m ³ / min, and the outflow speed was 6.4 m / s.

(Comparative Example 2)
A fan-attached filter unit was produced in the same manner as in Example 1 except that the distance (h) between the outer peripheral edge of the lower surface of the axial fan and the corresponding upper surface of the filter pack was 34 mm. And using the produced filter unit with a fan, while measuring the air volume of external air, the outflow speed after a resistor collision was calculated. As a result of the measurement and calculation, the air volume was 10.0 m 3 / min and the outflow speed was 3.0 m / s.

(Evaluation method)
As for “compactness”, the distance between the outer peripheral edge of the lower surface of the axial fan and the upper surface of the corresponding filter pack, which is obtained by subtracting the thickness of the axial fan and the thickness of the filter pack from the total thickness of the housing, is 25 mm or less. The case was evaluated as ◯, and the case of more than 25 mm was evaluated as ×.

“Low structural resistance” was evaluated as “good” when the air volume was 9.5 m ³ / min or more, and “x” when the air volume was less than 9.5 m ³ / min.

Also, as a comprehensive evaluation, when both “compact” and “low structural resistance” are ○, it is evaluated as ○ as a comprehensive evaluation, and when any one is ×, as a comprehensive evaluation × It was evaluated.
Table 1 shows the measurement results of the outside air volume obtained as described above, the calculation results of the outflow speed after the resistor collision, the compactness evaluation, the low structural resistance evaluation, and the comprehensive evaluation.

As shown in Table 1, in the filter unit with a fan of Example 1, the distance between the lower surface outer peripheral portion of the axial flow fan and the corresponding upper surface portion of the filter pack is 25 mm or less, so the compactness is excellent and the air volume is high. 9.9 m ³ / min and a measure of 9.5 m ³ / min or more in which because it is possible to ensure a desired air volume.

Further, in the filter unit with a fan of Comparative Example 1, although the distance between the outer peripheral end portion of the lower surface of the axial fan and the upper surface portion of the corresponding filter pack is 25 mm or less, it is excellent in compactness, but the air volume is 8.7 m ^3. / Min and a target (target) of less than 9.5 m ³ / min, the desired air volume could not be secured.

Further, in the fan with filter units Comparative Example 2, although the air volume can be ensured desired air volume because it is 10.0 m ³ / min and a measure of 9.5 m ³ / min or more, the lower surface outer periphery of the axial fan Since the distance between the end portion and the upper surface portion of the filter pack corresponding to the end portion is more than 25 mm, the compactness is poor and the casing is enlarged.

The method for producing a filter unit with a fan according to the present invention provides a filter unit with a fan capable of maintaining a desired air volume by reducing the structural resistance of the entire unit while reducing the size and size. In that respect, it has industrial applicability.

Sectional drawing of the filter unit with a fan produced by one Embodiment of this invention The top view which shows an example of the arrangement in the case where a plurality of axial fans are provided in the filter unit with a fan as shown in FIG. Sectional view of an example of a conventional filter unit with a fan Sectional view of an example of a conventional filter unit with a fan Sectional view of an example of a conventional filter unit with a fan

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter unit with fan 2 Fan part 10 Axial fan 11 Fan main body 20 Chamber chamber 21 Casing 22 Opening 3 Filter part 30 Air filter 31 Filter pack 32 Filter frame 4 Current plate 5 Gasket

Claims (2)

A method for producing a filter unit with a fan, which has a chamber chamber formed of a casing on the upstream side of a filter in which a filter pack is fixed in a filter frame, and is provided with an axial fan in the chamber chamber,
In order to make the filter unit with a fan compact while maintaining the air volume of the filter unit with a fan at a desired value,
Shall shortest distance S in the horizontal direction between the side wall surface of the casing and the lower surface peripheral edge of the axial flow fan is larger than the distance h between the upper surface portion of the filter pack and the corresponding lower surface outer peripheral end portion of the axial fan ,
A passing wind speed passing through a plane formed by a line segment defined between each point on the outer peripheral end of the lower surface of the axial fan and the shortest distance from each point to the upper surface of the filter pack is V ( m / s), the distance h is designed so that the passing wind speed V satisfies the relationship of 3 <V <6.   The method for manufacturing a filter unit with a fan according to claim 1, wherein a plurality of axial fans are provided in the chamber.

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