JP2015062881A - Dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collector which comprises a coarse dust filter and a fine dust filter and ensures air permeability of the fine dust filter even when the coarse dust filter is clogged, thereby suppressing increase in pressure loss.SOLUTION: A dust collector 1 comprises a coarse dust filter 5 and a fine dust filter 6, with the coarse dust filter 5 having a pleats-like folded shape, providing air gaps in a stripe pattern between the coarse dust filter 5 and the fine dust filter 6. Thereby, the dust collector 1 can ensure air permeability of the fine dust filter 6 and can suppress increase in pressure loss.

Description

  The present invention relates to a dust collector that removes dust in the air with a filter.

  One or more pleated dust collection filters with high collection performance such as HEPA, and a coarse dust removal filter with a relatively large particle diameter in the preceding stage as dust collection filters used in air cleaners, etc. Multi-stage types that are arranged and combined are widely used.

  Hereinafter, an example of a conventional multistage dust collection filter will be described with reference to FIGS. 4 and 5.

  The dust collector 101 includes an air inlet 103 and an exhaust port 104 in the main body casing 102, and includes a blower unit 105 between the intake port 103 and the exhaust port 104, and between the intake port 103 and the blower unit 105, Dust collecting means 106 is provided.

  The dust collecting means 106 includes a coarse dust filter 107 for removing coarse dust and a fine dust filter 108 for removing fine dust.

  An air flow is generated in the dust collector 101 by the blowing means 105, and the air introduced from the intake port 103 passes through the dust collecting means 106 and the blowing means 105 and is discharged from the exhaust port 104. Among the dust contained in the air, dust having a relatively large particle diameter is collected by the coarse dust filter 107, and dust having a small particle diameter that is not collected by the coarse dust filter 107 is collected by the fine dust filter 108. .

  Generally, in order to collect fine dust, pleated type fine dust filter 108 with high collection efficiency such as HEPA is used, and it is possible to collect all fine dust and coarse dust with this filter. However, since the pleated filter has a structure that is difficult to wash, it needs to be replaced if dust accumulates to some extent. Therefore, a coarse dust filter 107 mainly made of a material such as a flat nonwoven fabric that can be washed is arranged upstream of the fine dust filter 108, and dust having a large particle diameter is collected by the coarse dust filter 107. Thus, the amount of dust accumulated in the fine dust filter 108 can be reduced.

  Providing a plurality of filters having different particle diameter ranges to be collected in this way has an advantage that the frequency of replacement of filters that cannot be washed can be reduced.

  There exists patent document 1 as such a conventional multistage type dust collection filter.

JP-A-2005-221220

  A typical form of a conventional multistage dust collection filter is a two-stage type in which a coarse dust filter and a fine dust filter are overlapped as shown in FIG. 5, and is widely used in air cleaners and the like. . Since a coarse pressure filter is required to have a low pressure loss, a thin non-woven fabric is generally used. However, since it does not have sufficient rigidity as a flat plate, some reinforcement is required to give tension to the nonwoven fabric. When the filter is rectangular, for example, there is a method of fixing four sides around the nonwoven fabric with a frame material. Thereby, the flatness of the nonwoven fabric can be obtained, but if the velocity of the airflow passing through the coarse dust filter is large, the nonwoven fabric bends in the downstream direction by the wind pressure, which becomes a distortion and impairs the flatness of the filter, There is a problem of causing damage.

  Therefore, if the coarse dust filter and the fine dust filter are overlapped so that there is no gap between them, that is, if the back surface of the nonwoven fabric is placed in contact with the surface of the fine dust filter, the nonwoven fabric caused by airflow The effect of avoiding surface deflection is obtained. Further, the same effect can be obtained by a method in which the periphery of the nonwoven fabric is bonded to the frame material of the subsequent fine dust filter and integrated with the fine dust filter.

  On the other hand, in the dust collection filter, clogging occurs due to the accumulation of collected dust, which acts as a resistance to the air flow and reduces the air volume. In a configuration where there is no gap between the coarse dust filter and the fine dust filter, both filters are in contact with each other, so if partial clogging occurs on the coarse dust filter, the air flow is the same in both filters. It will be blocked. If a gap is provided between the two filters, even if the coarse dust filter partially blocks the airflow, the blockage can be alleviated when the airflow passes through the fine dust filter due to the presence of the gap. However, if a gap is provided between the two filters, there is a problem that the coarse dust filter bends as described above.

  This invention solves the said conventional subject, and it aims at providing the dust collector which suppressed the increase in the pressure loss of a dust collection filter.

  In order to achieve this object, the present invention provides an intake port for introducing air from the outside, an exhaust port for exhausting air, a blowing means for generating an air flow, and a rough air. In a dust collector including a coarse filter for collecting dust and a pleated fine dust filter for collecting fine dust downstream of the coarse filter, the coarse filter is folded back into a pleated shape. In this way, the intended purpose is achieved.

  According to the present invention, an air inlet for introducing air from the outside, an air outlet for discharging air, an air blowing means for generating an air flow, and a coarse dust filter for collecting coarse dust in the air And in a dust collector equipped with a pleated fine dust filter for collecting fine dust downstream of the coarse dust filter, the coarse dust filter is formed into a shape that is folded back into a pleated shape. The valley of the pleats on the back side of the dust filter becomes a streak-like gap that crosses the opening surface of the fine dust filter. It is possible to provide a dust collector that can be provided with air permeability and suppress an increase in pressure loss.

The side view which shows the dust collector of embodiment of this invention Side view of the coarse filter Perspective view of the coarse filter Side view showing a conventional dust collector Perspective view of the coarse dust filter and fine dust filter

  The dust collector according to claim 1 of the present invention includes an intake port for introducing air from the outside, an exhaust port for discharging air, a blowing means for generating an air flow, and coarse dust in the air. In a dust collector comprising a coarse dust filter for collecting fine particles and a pleated fine dust filter for collecting fine dust downstream of the coarse dust filter, the coarse dust filter is folded back into a pleated shape. It has a shape.

  The air blowing means refers to a sirocco fan used in a dust collector having a relatively high filter static pressure.

  The pleated fine dust filter means a dust collection filter that specifically collects fine dust having a particle diameter of 1 μm or less, and HEPA, a high performance filter, a medium performance filter, and the like are applicable.

  The coarse dust filter refers to a dust collection filter intended for dust having a particle diameter exceeding 1 μm, and is a filter made of a flat nonwoven fabric or a sponge-like material having a gap as a raw material.

  In the present invention, the coarse dust filter has a shape that is folded back into a pleat shape, thereby providing a streak-like gap between the coarse dust filter and the fine dust filter.

  The coarse dust filter of the present invention having a folded shape in a pleated shape suppresses the coarse dust filter itself from being bent by contacting the surface of the fine dust filter with the ridge line portion of the pleated folded shape. The trough part that is folded back forms a streak-like gap between the fine dust filter and the airflow generated on the coarse dust filter can be reduced before the fine dust filter. It is.

  Partial accumulation due to dust on the filter tends to occur at the center of the filter. At that time, the air flow moves to a portion outside the central portion where dust accumulation is small. That is, the airflow tends to pass through a portion off the center of the filter. In the state where the coarse dust filter and the fine dust filter are in contact with each other, the airflow also passes through a portion off the center of the fine dust filter. In the structure of the present invention, since there is a gap between the coarse dust filter and the fine dust filter, the air that has passed through the part off the center in the coarse dust filter is moved above and below the fine dust filter via the streaky gap. Since it spreads to both ends in the direction or the left-right direction, the airflow can pass through the entire opening surface of the fine dust filter.

  As a result, even if the coarse air filter partially blocks the air flow due to the accumulation of dust, the air flow passing through the fine dust filter is secured, so that it is possible to provide a dust collector that suppresses an increase in pressure loss. .

  In the dust collector according to claim 2, the material of the coarse dust filter is urethane foam. The nonwoven fabric generally used as the material for the coarse dust filter has a thickness of about 5 mm to 10 mm. However, in order to obtain a folded shape in a pleated shape, the nonwoven fabric is processed by a processing machine capable of bending a flat plate material. The sheet must be creased. Even if a crease is formed, the shape cannot be kept constant due to the repulsive force, so it is necessary to maintain the shape using a stiff reinforcing material.

  However, in the case of urethane foam, since it can be molded by a method such as placing urethane raw material in a pleated mold and foaming, the pleated shape can be maintained without using a reinforcing material.

  In the dust collector of claim 3, the folded shape of the coarse dust filter is a corrugated shape. In a pleated fine dust filter such as HEPA, the top of the folded peak has a sharp shape. Similarly, the coarse dust filter may have a pointed apex shape, but the pressure loss can be kept low by using a wave shape like a sine wave having a gentle apex.

  According to a fourth aspect of the present invention, there is provided a dust collecting apparatus in which the coarse dust filter and the fine dust filter have pleat folding directions orthogonal to each other. There is no difference in the effect of suppressing the increase in pressure loss, regardless of whether the pleat fold direction of both filters is parallel or perpendicular, but if both directions are parallel, the folds of the coarse dust filter are folded. When the ridge line portion overlaps between the folded valleys of the fine dust filter, the crush of the coarse dust filter may bite into the valley of the fine dust filter due to the pressure of the air flow, and the filter may be deformed. Therefore, the deformation of the filter can be prevented by making the pleat folding directions perpendicular to each other.

(Embodiment)
As shown in FIG. 1, the dust collector 1 includes an intake port 2 for introducing air from the outside, an exhaust port 3 for discharging air, an air blowing means 4 for generating an airflow, A coarse filter 5 for collecting coarse dust and a pleated fine dust filter 6 for collecting fine dust are provided downstream of the coarse filter 5.

  The air blowing means 4 refers to a sirocco fan used in a dust collector having a relatively high filter static pressure.

  The pleated fine dust filter 6 means a dust collection filter that specifically collects fine dust having a particle diameter of 1 μm or less, and HEPA, a high performance filter, a medium performance filter, and the like are applicable.

  The coarse dust filter 5 has a shape that is folded back into a pleat shape, and is formed by processing foamed urethane so that the cross-sectional shape is corrugated. The foaming density of the urethane foam is arbitrarily determined according to the pressure loss and dust collection efficiency required of the coarse dust filter 5, but the surface wind speed of the filter is 0.5-3 m / s as in a domestic air cleaner. If the target is a coarse dust filter 5 for collecting dust having a particle diameter of 1 μm or more on the target, a foam density of 10 to 50 cells / inch is appropriate.

  Further, the thickness of the coarse dust filter 5 is appropriate to be 20 mm or less in consideration of the pleated shape for mounting on a domestic air cleaner, and 5 mm or more in consideration of maintaining the shape. Is good.

  The higher the height of the pleat peak, the larger the gap between the valleys on the downstream surface of the coarse dust filter. Therefore, when the coarse dust filter 5 is clogged, the increase in pressure loss of the fine dust filter 6 can be further suppressed. it can. There is an effect of reducing the pressure loss of the coarse filter 5 as the period of folding, that is, the interval between adjacent peaks in the pleat is smaller.

  Actually, it is necessary to balance the thickness of the foamed urethane fabric, the height of the ridges, and the turn-up cycle so that it can be designed as a pleated shape. For example, when the thickness of the urethane foam fabric is 10 mm, the height of the pleat peak is 20 to 30 mm, which is 2 to 3 times the wall thickness, and the folding cycle is about 10 to 30 mm, which is 1 to 3 times the wall thickness. It is good to design.

  FIG. 2 shows the coarse dust filter 7 folded in a wave shape. Whereas the peak of the folded peak has a sharp shape, the peak portion is gently rounded, so that the coarse dust filter 7 has a sine wave shape, and the pressure loss of the coarse dust filter is further reduced. There is a reduction effect.

  FIG. 3 shows an arrangement in which the direction of pleat folding of the coarse dust filter 8 and the fine dust filter 6 is perpendicular to each other. Since the ridge line of the mountain on the downstream side of the coarse dust filter 8 is in contact with the ridge line of the pleat on the upstream side of the fine dust filter 6, when the coarse dust filter 8 receives air pressure, It is possible to prevent the filter 8 from being bent or deformed.

  If the pleat folding directions of both filters are the same, the ridge line of the pleats on the downstream side of the coarse dust filter 8 may overlap the valleys of the pleats on the upstream side of the fine dust filter 6. When the peak of the coarse dust filter 8 bites into the valley of the fine dust filter 6 due to the pressure of the airflow, the gap that should be formed on the downstream side of the coarse dust filter 8 disappears in the vicinity thereof. When the air flow is blocked by the dust accumulated on the coarse dust filter 8 in the portion where the air gap has disappeared, the portion in the fine dust filter 6 should flow through the air gap from the portion where the air flow is not closed. Air can be hindered by the bite and increase the pressure loss of the fine dust filter. In the arrangement in which the pleat folding directions of both filters are orthogonal, there is an effect of avoiding this problem.

  The present invention relates to a dust collecting device for removing dust in the air with a filter, a coarse dust filter for collecting coarse dust in the air, and for collecting fine dust downstream of the coarse dust filter, It is equipped with a pleated fine dust filter, and the coarse dust filter is folded back into a pleated shape, which is useful because it suppresses the increase in pressure loss of the dust collection filter due to the deflection of the coarse dust filter. .

DESCRIPTION OF SYMBOLS 1 Dust collector 2 Intake port 3 Exhaust port 4 Blower means 5 Coarse dust filter 6 Fine dust filter 7 Coarse dust filter 8 Coarse dust filter 101 Dust collector 102 Main body casing 103 Inlet port 104 Exhaust port 105 Blower means 106 Dust collector means 107 Coarse dust filter 108 Fine dust filter

Claims (4)

An air inlet for introducing air from the outside, an air outlet for discharging air, an air blowing means for generating airflow, a coarse dust filter for collecting coarse dust in the air, and the coarse dust filter A dust collector provided with a pleated fine dust filter for collecting fine dust downstream, wherein the coarse dust filter has a shape folded back into a pleat shape. The dust collector according to claim 1, wherein the material of the coarse dust filter is urethane foam. The dust collecting apparatus according to claim 2, wherein the folded shape of the urethane foam is wavy. The dust collector according to any one of claims 1 to 3, wherein the pleat folding directions of the coarse dust filter and the fine dust filter are orthogonal to each other.

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