JP2019005735A - Spacer for pleat type filter - Google Patents

Abstract

To provide a spacer fitted between pleats of a filter having filter material molded by pleat processing.SOLUTION: By using spacers including: valley parts which are fitted between pleat parts of the other lateral surface sides of pleat rolls of cloth, are not connected with other spacers fitted between adjacent other pleat parts and are arranged on positions opposite to the other lateral surface side of inflow side turn-up parts of the pleat rolls of cloth; open parts arranged on positions located closely to outflow side turn-up parts of the pleat rolls of cloth; and beams arranged between the valley parts and the open parts, the connecting material for connecting the open parts and the beams being elastic materials which have open part lateral end parts of the beams as fulcrums and a length of direction along creases of the pleat rolls of cloth being approximately equal to a length of the spacers, a decrease of an effective filtration area due to adhesion of the pleats is prevented and damage due to fatigue breakage of main filter material and auxiliary filter material is prevented.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spacer attached between pleats of a filter having a filter material formed by pleating.

In order to remove dust or mist in the gas, solid matter or liquid matter floating in the liquid, a filter in which a filter medium is fixed in the frame is used.
In such a filter, by increasing the filtration area of the filter medium, it is possible to suppress an increase in pressure loss caused by the passage of fluid, and to increase the amount of dust trapped by the filter medium to replace the filter. In order to extend the service life and the like, a filter material is formed into a pleated fold shape or corrugated shape to increase the area of the filter material (for example, Patent Document 1 and Patent Document 2).

  Here, when the filter medium is folded in a pleat shape, the crease part of the continuous pleat and the plane part between the crease parts are directed toward the outflow side by the pressure from the inflow side due to the flow resistance of the fluid passing through the filter medium. This causes a phenomenon in which continuous pleat portions are in close contact with each other to prevent fluid flow and reduce the area of the filter medium that is effectively used for filtration.

  In order to prevent the occurrence of this phenomenon, in Patent Document 2, a linear resin solid material such as hot melt resin is applied between the folds to keep the space between the folds. In Patent Document 3, the pleats are maintained. In order to maintain the interval, a spacing member is disposed on the inlet side. Further, in Patent Document 4, the net material is pleated together with the filter medium to maintain fluid flow even when the pleats approach, and in Patent Document 5, the reinforcing material is pleated together with the electret nonwoven fabric and the glass fiber filter medium. The filter medium is reinforced against the flow of fluid and the accumulation of collected objects.

Japanese Patent Laid-Open No. 2002-233711 JP 2007-083178 A JP 2014-061467 A JP-T-2006-501058 JP 2012-086183 A JP 2010-110760 A

  However, the resin solid material used in Patent Document 2 is a product in which a linear hot melt resin or the like is applied between the pleat portions, and the pressure between the fluid passing through the entire surface of the filter medium causes It is impossible to prevent the pleats from sticking to each other.

Moreover, since the space | interval holding member used by patent document 3 is attached only to the upper and lower ends of the inflow side of a filter medium, and is hold | maintained only at the inflow side, it prevents the contact | adherence of the pleat anti-contact by the fluid pressure I can't.

Furthermore, in the reinforcing material such as a mesh used in Patent Document 4 and Patent Document 5, it is pleated together with a filtering material mainly for the purpose of removing dust and mist (hereinafter referred to as “main filtering material”), Since the mesh material or the like spreads over the entire surface of the filter medium, fluid does not flow through the fiber or the like constituting the mesh material. This directly leads to a decrease in the effective filtration area of the filter medium and an increase in pressure loss.

In addition to these problems, when the flow rate and supply pressure of the fluid pulsates frequently, the mesh etc. also vibrates in accordance with the amplitude of the main filter material, and the mesh etc. are thick fibers to increase the strength. In the case of a material having a diameter or a highly rigid material, there has been a problem that the mesh or the like is broken due to fatigue failure due to the pulsation.

In addition, in this specification, the resin solid substance described in patent document 2, the space | interval holding member described in patent document 3, the support layer described in patent document 4, patent document 5, the nonwoven fabric filter material for reinforcement, etc. The part used to maintain the counter spacing is hereinafter referred to as a spacer.

A filter material that has a function of removing and capturing dust, mist, and the like to be collected contained in a fluid and that has been pleated is called a main filter material, and is pleated together with the main filter material. A filter medium that assists in the function of removing and capturing the filter medium is referred to as a sub-filter medium.

The present invention has been made to solve the above problems, and is a spacer used in a pleated type filter that allows fluid to flow from one side surface to the other side surface, and between the pleat portions on the other side surface opposite to the pleat. A trough portion that is not connected to other spacers attached between other adjacent pleat portions and is disposed at a position facing the other side surface of the inflow-side folded portion of the pleat opposite; and the pleat opposite An opening portion disposed at a position close to the outflow side folded portion, and a beam portion disposed between the valley portion and the opening portion, and a connecting material connecting the opening portion and the beam portion is a beam portion. The length of the elastic material having a fulcrum of the pleat opposite side as a fulcrum is approximately the same as the length of the spacer.

Further, the present invention is a spacer used for a pleated type filter formed in a cylindrical shape that allows fluid to flow from the inner peripheral side to the outer peripheral side, and is attached between each pleat portion on the outer peripheral side of the pleated material formed in a cylindrical shape. And other spacers that are not continuous with other spacers mounted between adjacent pleat portions, and are arranged at positions facing the inner fold-back portion of the pleat opposite to the inner fold-back portion, and the outer fold-back portion of the pleat opposite An opening portion disposed at a position close to the beam portion, and a beam portion disposed between the trough portion and the opening portion, and a connecting material connecting the opening portion and the beam portion is an opening portion side end of the beam portion. It is an elastic material having a portion as a fulcrum, and the length in the direction along the pleat anti-fold is substantially the same as the length of the spacer.

  Since the spacers are not continuous and the area covering the main filter material that mainly captures dust and mist is small, the spacers do not hinder the flow of fluid, and the effective filtration area of the main filter material can be ensured.

Further, since there is no spacer at the pleat folded portion on the outflow side where the amplitude of the filter medium due to the pulsation of the fluid is larger than that on the inflow side of the fluid, there is no possibility that the spacer will break due to fatigue failure.

  Furthermore, since the spacer has a beam part, the expansion of the pleat anti-curvature caused by the flow resistance of the fluid is restricted, and the connecting material extending from the beam part to the open part has elasticity, so that the main filter medium is caused by fluid pulsation. Even when swelling or contraction occurs, the spacer can regulate and absorb the movement. Therefore, it is possible to keep the pleat interval of the main filter medium constant and to prevent the effective filtration area from being reduced due to the close contact of the pleat part.

It is preferable that the opening portion according to the present invention has a claw portion that restricts elastic deformation of the connecting material due to deformation of the pleat anti-spreading. This is to prevent excessive deformation and breakage of the connecting material due to deformation of the pleats caused by the fluid passage resistance.

The connecting member of the spacer according to the present invention is preferably made of a thermoplastic synthetic resin fiber having a wire diameter of 0.5 mm or more and 3 mm or less.
It is possible to use a thermoplastic synthetic resin or a metal material having an appropriate strength for maintaining the opening of the spacer and maintaining the elasticity required for the spacer.

The spacer concerning this invention can be used conveniently for the oil mist separator for removing the oil mist in the air discharged from the air compressor from which a flow rate and / or a pressure fluctuate frequently.

  By using the spacer of the present invention, it is possible to prevent deformation of the main filter medium and sub-filter medium caused by fluid flow resistance while preventing an increase in pressure loss resulting from a decrease in effective filtration area. Further, even when pulsation occurs in the supply of the fluid, the fatigue failure of the spacer can be prevented.

It is a figure showing the appearance of a filter concerning a first embodiment of the present invention. It is the figure which expanded a part of AA cross section of the filter concerning FIG. It is a figure showing the external appearance of the filter concerning 2nd embodiment of this invention. It is a figure showing the BB cross section of the filter concerning FIG. It is the figure which expanded a part of FIG. It is a top view showing the form of the spacer concerning the present invention. It is a perspective view showing the form of the spacer concerning the present invention.

  The spacer according to the present invention is made by injection molding in which a thermoplastic synthetic resin is heated and melted, injected and injected into a mold, and cooled and solidified to obtain a molded product, or plastic welding using a hot jet, ultrasonic wave, laser, or the like. It can be manufactured by cutting or the like.

  The spacer according to the present invention can also be manufactured by punching a thermoplastic synthetic resin plate, a stainless steel metal plate, or the like into an arbitrary shape and then bending the valley.

What is necessary is just to select the material of the spacer concerning this invention suitably according to the property of the fluid. Based on the elasticity, durability, moldability, etc. required for the spacer material, it can be selected from thermoplastic synthetic resins, metal materials, and combinations thereof.

1st Embodiment of the spacer concerning this invention is described based on drawing. FIG. 1 is an outline view of a flat filter 1 in which a spacer according to the present invention is used, and FIG. 2 is a plan view of a pleated portion in which a part of the AA cross section of FIG. 1 is enlarged.

In FIG. 2, the spacer 3 is inserted independently between the pleat portions 23 on the outflow side of the pleat opposite 2, and the valley portions 32 of the spacer 3 are arranged so as to face the inflow side folded-back portion 21 of the pleat opposite 2. Thus, in the vicinity of the inflow-side folded portion 21 where the interval between the pleat portions 23 is narrow and in the vicinity of the outflow-side folded portion 22 where the interval between the pleats is wide, the spacers are uniformly arranged in the space, and the pleat reaction due to the flow resistance of the fluid Expansion can be regulated uniformly. Further, a beam 30 is provided between the open portion 31 and the valley portion 32 of the spacer as shown in the figure, and prevents the two end portions of the open portion from sticking to each other when the pleat reaction is expanded by the fluid pressure.

A connection member 34 is provided between the open portion 31 and the beam portion 33 and is an elastic material having an end portion on the open portion 31 side of the beam portion 33 as a fulcrum. Due to the elasticity of the elastic material 34, even when the flow rate or supply pressure of the fluid pulsates frequently, even if the main filter material swells or contracts, the spacer can regulate and absorb the movement. it can. Therefore, it is possible to keep the pleat interval of the main filter medium constant and to prevent the effective filtration area from being reduced due to the close contact of the pleat part.

The shape of such a spacer is shown in FIGS. 6 (a) to 6 (c) and FIGS. 7 (a) to 7 (c). 6A and 7A, the entire spacer is made of a thermoplastic synthetic resin or a metal material. Moreover, in the aspect of FIG.6 (b) and FIG.7 (b), the intensity | strength of a beam part is improved by comprising between the trough part 32 and the beam part 33 as a uniform board | plate material. Further, in the modes of FIG. 6C and FIG. 7C, the claw portions 35 are provided at several places in the longitudinal direction of the opening portion 31, and the amount of bending when the connecting member 34 is bent due to the expansion of the pleats is restricted. As a part.
The mode of FIG. 6D shows a configuration in which the beam portion is joined to the connecting member 34 only at one end and the unjoined portion 36 is not joined to the connecting member 34 at the other end. Even in such a configuration, when the spacer is attached between the pleats, the spacer has a closed shape due to the tension of the pleat counter or due to the stress received from the pleat counter resulting from the flow resistance when the fluid is passed. The unjoined portion 36 comes into contact with the connecting member 34 and has the same configuration as that shown in FIG. With such a configuration, the spacer can be easily manufactured, and the connecting material 34 has elasticity with the unjoined portion 36 in contact with the connecting material 34 as a fulcrum, so that FIG. The effect similar to the shape as described in (c) can be acquired.

The spacer 3 according to the present invention can be inserted between the pleat portions 2 of the pleats 2 and adhered or welded to the end plate 5 together with the pleats 2 to be fixed. At that time, in order to prevent the pleat fabric 2 from being excessively expanded due to the flow resistance of the fluid and the spacer 3 from being detached to the outflow side, the outer winding 4 is attached to the outflow side or outflow side and inflow side of the filter 1. be able to. Further, instead of the outer roll 4, the outflow side of the filter 1 or the entire filter can be covered with a rigid outer cylinder or the like.

3 to 5 are views showing a second embodiment of a spacer according to the present invention and a filter using the spacer. In this embodiment, the filter 10 and the pleats 2 used for the filter are cylindrical, the inner peripheral side of the cylinder is the fluid inflow side 6, and the outer peripheral side is the fluid outflow side 7. 3 is an external view of the filter 10 using the spacer according to the present invention, FIG. 4 is a cross-sectional view taken along the line BB of FIG. 1, and FIG. 5 is an enlarged view of a part of FIG. And the site | part which has the same function as FIG. 2 is attached | subjected the same number.

The present embodiment is different from the first embodiment in that the filter 10 is cylindrical, and the outer roll 4 and the end plate 5 are annularly associated with this. The filter of this form is used, for example, to remove oil mist in compressed air discharged from an oil supply type air compressor, oil mist in exhaust discharged from an oil rotary vacuum pump, or the like. Therefore, the fluid is allowed to pass through with the inner circumference side of the cylinder as the inflow side and the outer circumference side as the outflow side, and oil mist is collected and agglomerated using the main filter medium and sub-filter medium, and the fluid is discharged from the outflow side. The material / subfilter material is collected and the agglomerated oil is discharged from the outflow side.

(Example 1 to Example 8)
A spacer 3 was prepared with the configuration shown in Table 1, and a pleated type filter in which the spacer 3 was inserted between the pleats was prepared. For the pleat fabric ^2, a non-woven fabric made of glass fiber with a fiber diameter of 1.3 μm and a basis weight of 350 g / m ² is sandwiched between 20 g / m ² basis weight of a spanned nonwoven fabric made of PET. A pleat type filter having a pleat height of 20 mm and a pleat number of 45 was formed by integrally forming with an outer cylinder, an outer wound filter medium, and an end plate.
In Table 1, a to f are the dimensions of the parts shown in FIGS. 7A to 7F, and r is a chamfer radius of a corner formed by the beam 33 and the connecting member 34.

The pleated type filters of Examples 1 to 4 were attached between a 5.5 kW, oil-feeding reciprocating air compressor and an air receiver tank with a capacity of 250 L to remove oil mist in the discharged air. At that time, 10 L / min of air was constantly released from the air receiver tank, and the pressure in the air receiver tank was controlled to be an upper limit of 1 MPa and a lower limit of 0.8 MPa. This caused pulsation in the air passing through the pleated type filter.
Moreover, said evaluation was performed using the same pleat type filter which has not inserted the spacer between pleats as a comparative example.

After each filter was used until it received 10,000 pulsations, the filter was disassembled and the state of the pleats and spacers was observed.
In Examples 1 to 7, neither the pleats nor the spacers were changed from the state before use.
The spacer of Example 8 was in a state where some biting occurred in the pleat reaction, and it was found that the amplitude generated in the pleat reaction was excessively restricted by air pulsation. It is considered that the spacer strength was excessive with respect to the present evaluation conditions.
The spacer of Example 9 was in a state in which the open portions were in contact with each other even when the spacer was removed from the pleat fabric, although the pleat fabric was not damaged. It is considered that the spacer strength was insufficient for the present evaluation conditions.
In the pleated type filter in which no spacer was inserted, the glass fiber nonwoven fabric was ruptured at two places on the outflow side folded portion opposite to the pleat.

  The spacer concerning this invention is used in order to prevent the deformation | transformation which arises by the distribution resistance of a pleat type filter, and can be used suitably especially for the filter which filters the fluid which a flow volume change and a pressure change generate | occur | produce with high frequency. The filter using the spacer according to the present invention is an oil mist separator that removes oil mist in compressed air discharged from an oil supply type air compressor or oil mist in exhaust discharged from an oil rotary vacuum pump. Can be suitably used.

DESCRIPTION OF SYMBOLS 1,10 Filter 2 Pleat side 21 Inflow side folding | returning part 22 Outflow side folding | turning part 23 Between pleat parts 3 Spacer 31 Opening part 32 Valley part 33 Beam part 34 Connecting material 35 Claw part 36 Unjoined part 4 Outer winding 5 End cap 6 Inner circumference (inflow side)
7 Outer peripheral side (outflow side)

Claims (5)

A spacer used in a pleated type filter that circulates fluid from one side to the other side,
Attached between the pleats on the other side of the pleat opposite
It is not continuous with other spacers attached between other adjacent pleats,
A trough disposed at a position facing the other side of the inflow side folded portion of the pleat opposite;
An open portion disposed at a position close to the outflow side folded portion of the pleat opposite;
It has a beam part arranged between the valley part and the open part,
The connecting material connecting the open portion and the beam portion is an elastic material having an end portion on the open portion side of the beam portion as a fulcrum,
The length in the direction along the fold of the pleat is substantially the same as the length of the spacer,
Spacer. A spacer used in a pleated type filter formed in a cylindrical shape that circulates fluid from the inner peripheral side to the outer peripheral side,
It is attached between each pleat part on the outer peripheral side of the pleat opposite to the cylindrical shape,
It is not continuous with other spacers attached between other adjacent pleats,
A trough disposed at a position facing the inner circumferential side folded portion of the pleat opposite;
An opening portion disposed at a position close to the outer circumferential side folded portion of the pleat opposite;
It has a beam part arranged between the valley part and the open part,
The connecting material connecting the open portion and the beam portion is an elastic material having an end portion on the open portion side of the beam portion as a fulcrum,
The length in the direction along the fold of the pleat is substantially the same as the length of the spacer,
Spacer. The said connection material consists of a thermoplastic synthetic resin and / or metal material with a wire diameter of 0.5 mm or more and 2 mm or less, or a thermoplastic synthetic resin and / or metal material with a thickness of 0.5 mm or more and 2 mm or less. Or the spacer for pleated type filters of Claim 2. 4. The pleated filter spacer according to claim 1, wherein the open portion includes a claw portion that restricts elastic deformation of the connecting member due to deformation of the pleat anti-split. 5. An oil mist separator in which the spacer according to claim 1 is attached between pleat portions.