JP7012467B2 - Spacer for pleated type filter - Google Patents

Description

The present invention relates to a spacer attached between the pleats of a filter having a filter medium molded by pleating.

In order to remove dust and mist in gas and solids and liquids floating in liquid, a filter in which a filter material is fixed in a frame is used.
For such a filter, the increase in pressure loss caused by the passage of fluid is suppressed by increasing the filtration area of the filter material, and the amount of dust and the like captured by the filter material is increased to replace the filter. In order to extend the life and the like, a filter medium is often formed into a pleated shape or a corrugated shape to increase the area of the filter medium (for example, Patent Document 1 and Patent Document 2).

Here, when the filter material is folded into pleats, the flow resistance of the fluid passing through the filter material causes the continuous pleated folds and the flat portion between the folds to be directed toward the outflow side due to the pressure from the inflow side. It swells and the continuous pleated parts come into close contact with each other to hinder the flow of fluid, resulting in a phenomenon that the area of the filter material effectively used for filtration is reduced.

In order to prevent the occurrence of this phenomenon, in Patent Document 2, a linear resin solid such as a hot melt resin is applied between the folds to maintain the distance between the folds, and in Patent Document 3, pleats are used. A space holding member is arranged on the inlet side in order to maintain the space between the two. Further, in Patent Document 4, the net material is pleated together with the filter medium to maintain the fluid flow even when the pleats approach each other, and in Patent Document 5, the reinforcing material is pleated together with the electret non-woven fabric and the glass fiber filter material. , The filter material is reinforced against the flow of fluid and the accumulation of collected objects.

Japanese Patent Application Laid-Open No. 2002-233711 Japanese Unexamined Patent Publication No. 2007-083178 Japanese Unexamined Patent Publication No. 2014-061467 Special Table 2006-501058 Gazette Japanese Unexamined Patent Publication No. 2012-08613 Japanese Unexamined Patent Publication No. 2010-11760

However, the resin solid matter used in Patent Document 2 is one in which a linear hot melt resin or the like is coated between the pleated portions, and the pressure between the resin solid matter is caused by the pressure of the fluid passing through the entire surface of the filter medium. It is not possible to prevent the adhesion of the pleated plastic that extends to the surface.

Further, since the interval holding member used in Patent Document 3 is attached only to the upper and lower ends of the inflow side of the filter material and is held only on the inflow side, it is necessary to prevent the pleated anti-adhesion due to the pressure of the fluid. Can't.

Further, the mesh-like reinforcing material used in Patent Document 4 and Patent Document 5 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 material, the fluid does not flow to the fibers or the like constituting the mesh material or the like. This directly leads to a decrease in the effective filtration area of the filter material and an increase in pressure loss.

In addition to these problems, when the flow rate and supply pressure of the fluid pulsate frequently, the mesh etc. also oscillates according to the amplitude of the main filter material, and the mesh etc. is a thick fiber for high strength. In the case of a material having a diameter or a material having high rigidity, there has been a problem that the mesh or the like breaks due to fatigue fracture due to the pulsation.

In this specification, the resin solid matter described in Patent Document 2, the spacing member described in Patent Document 3, the support layer described in Patent Document 4 and Patent Document 5, the non-woven fabric filter medium for reinforcement, and the like are pleats. The parts used to maintain the distance between the fabrics are hereinafter referred to as spacers.

In addition, a filter medium that has the function of removing and trapping dust and mist to be collected contained in the fluid and is pleated is called a main filter medium, and is pleated together with the main filter medium and is mainly used. The filter material that assists the removal / capture function of the filter material is called a sub-filter material.

The present invention has been made to solve the above-mentioned problems, and is a spacer used for a pleated type filter that circulates fluid from one side surface to the other side surface, and is between the pleated portions on the other side surface side of the pleated fabric. A valley portion that is attached and is not continuous with other spacers attached between other adjacent pleats and is arranged at a position facing the other side surface side of the inflow side folding portion of the pleated fabric, and the pleats. It has an open portion arranged at a position close to the folded-out portion on the opposite outflow side and a beam portion arranged between the valley portion and the open portion, and the connecting material connecting the open portion and the beam portion is a beam. It is a spacer which is an elastic material having an open portion side end of the portion as a fulcrum.

Further, the present invention is a spacer used for a cylindrically molded pleated type filter that allows fluid to flow from the inner peripheral side to the outer peripheral side, and is between each pleated portion on the outer peripheral side of the cylindrically molded pleated beam. A valley portion that is attached to the pleated portion and is arranged at a position facing the inner peripheral side folded portion of the pleated fabric without being continuous with other spacers attached between the adjacent pleated portions, and the pleated portion of the pleated fabric. It has an open portion arranged at a position close to the folded portion on the outer peripheral side and a beam portion arranged between the valley portion and the open portion, and the connecting material connecting the open portion and the beam portion is the beam portion. A spacer, which is an elastic material whose fulcrum is the end on the open side.

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 obstruct the flow of fluid, and the effective filtration area of the main filter material can be secured.

Further, since the spacer does not exist in the pleated folded portion on the outflow side where the amplitude of the filter material due to the pulsation of the fluid is larger than that on the inflow side of the fluid, there is no possibility of breakage due to fatigue fracture of the spacer.

Furthermore, since the spacer has a beam portion, the expansion of the pleated antinode caused by the flow resistance of the fluid is regulated, and the connecting material extending from the beam portion to the open portion has elasticity, so that the pulsation of the fluid makes the main filter material. Even when swelling or contraction occurs, the spacer can regulate and absorb the movement. Therefore, it is possible to keep the pleated spacing of the main filter material constant and prevent the effective filtration area from being reduced due to the close contact of the pleated portions.

It is preferable that the open portion according to the present invention has a claw portion that limits elastic deformation of the connecting material due to deformation of the pleated fabric. This is to prevent excessive deformation or breakage of the connecting material due to deformation of the pleated fabric caused by the passage resistance of the fluid.

It is desirable that the connecting material of the spacer according to the present invention is made of a thermoplastic synthetic resin having a wire diameter of 0.5 mm or more and 3 mm or less.
A thermoplastic synthetic resin or metal material having appropriate strength can be used to maintain the opening of the spacer and to maintain the elasticity required for the spacer.

The spacer according to the present invention can be suitably used as an oil mist separator for removing oil mist in the air discharged from an air compressor whose flow rate and / or pressure fluctuates frequently.

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

It is a figure which shows the appearance of the filter which concerns on the 1st Embodiment of this invention. FIG. 1 is an enlarged view of a part of the AA cross section of the filter according to FIG. 1. It is a figure which shows the appearance of the filter which concerns on the 2nd Embodiment of this invention. It is a figure which shows the BB cross section of the filter which concerns on FIG. It is an enlarged view of a part of FIG. It is a top view which shows the form of the spacer which concerns on this invention. It is a perspective view which shows the form of the spacer which concerns on this invention.

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

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

The material of the spacer according to the present invention may be appropriately selected according to the properties of the fluid. It can be selected from thermoplastic synthetic resins, metal materials, and combinations thereof based on the elasticity, durability, moldability, etc. required for the spacer material.

The first embodiment of the spacer according to the present invention will be described with reference to the drawings. FIG. 1 is an outline view of a flat plate 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 cross section taken along the line AA of FIG. 1 is enlarged.

In FIG. 2, the spacer 3 is independently inserted between the pleated portions 23 on the outflow side of the pleated anti-2, and the valley portion 32 of the spacer 3 is arranged so as to face the inflow side folded portion 21 of the pleated anti-2. As a result, spacers are uniformly arranged in the space in the vicinity of the inflow side folded portion 21 in which the distance between the pleated portions 23 is narrow and in the vicinity of the outflow side folded portion 22 in which the distance between the pleats is wide. Expansion can be regulated uniformly. Further, a beam portion 3 3 is provided between the open portion 31 and the valley portion 32 of the spacer as shown in the drawing to prevent the two ends of the open portion from coming into close contact with each other when the pleated fabric expands due to the pressure of the fluid. ..

The connection material 34 is between the open portion 31 and the beam portion 33, and is an elastic material having the end portion of the beam portion 33 on the open portion 31 side as a fulcrum. Due to the elasticity of the connecting material 34, the spacer regulates and absorbs the movement even if the main filter material swells or contracts when the flow rate or supply pressure of the fluid pulsates frequently. Can be done. Therefore, it is possible to keep the pleated spacing of the main filter material constant and prevent the effective filtration area from being reduced due to the close contact of the pleated portions.

The shapes of such spacers are shown in FIGS. 6 (a) to 6 (c) and FIGS. 7 (a) to 7 (c). In the aspect of FIGS. 6 (a) and 7 (a), the entire spacer is made of a thermoplastic synthetic resin or a metal material. Further, in the aspect of FIGS. 6 (b) and 7 (b), the strength of the beam portion is improved by forming the space between the valley portion 32 and the beam portion 33 as a uniform plate material. Further, in the embodiment of FIGS. 6 (c) and 7 (c), the claw portions 35 are provided at several points in the vertical direction of the open portion 31, and the amount of deflection when the connecting material 34 is bent due to the expansion of the pleated fabric is regulated. It is a department.
The aspect of FIG. 6D shows a configuration in which only one end of the beam portion is joined to the connecting material 34 and the other end has an unjoined portion 36 not joined to the connecting material 34. Even with such a configuration, when the spacer is attached between the pleats, the spacer becomes a closed shape due to the tension of the pleated fabric or the stress received from the pleated fabric generated by the flow resistance when the fluid is passed through. , The unjoined portion 36 comes into contact with the connecting material 34 and has the same configuration as in FIG. 6A. With such a configuration, it is possible to easily manufacture the spacer, and the connecting material 34 has elasticity with the unjoined portion 36 in contact with the connecting material 34 as a fulcrum. Therefore, FIG. 6A is shown. The same effect as that of the shape described in (c) can be obtained.

The spacer 3 of the present invention can be inserted into the space between the pleated portions 23 of the pleated anti 2 and adhered or welded to the end plate 5 together with the pleated anti 2 to be fixed. At that time, in order to prevent the pleated fabric 2 from expanding excessively or the spacer 3 from coming off to the outflow side due to the flow resistance of the fluid, the outer winding anti 4 is attached to the outflow side or the outflow side and the inflow side of the filter 1. be able to. Further, instead of the outer winding counter 4, the outflow side of the filter 1 or the entire filter may be covered with a rigid outer cylinder or the like.

3 to 5 are views showing the spacer according to the present invention and the second embodiment of the filter using the spacer. In this embodiment, the filter 10 and the pleated counter 2 used for the filter have a cylindrical shape, the inner peripheral side of the cylinder is the fluid inflow side 6, and the outer peripheral side is the fluid outflow side 7. FIG. 3 is a view showing the appearance of the filter 10 using the spacer according to the present invention, FIG. 4 is a sectional view taken along the line BB of FIG. 1, and FIG. 5 is an enlarged view of a part of FIG. And the parts having the same function as in FIG. 2 are numbered the same.

The present embodiment is different from the first embodiment in that the filter 10 has a cylindrical shape, and the outer winding counter 4 and the end plate 5 have a ring shape. This form of filter is used, for example, to remove oil mist in compressed air discharged from a refueling type air compressor, oil mist in exhaust discharged from an oil rotary vacuum pump, and the like. Therefore, the fluid is passed through with the inner peripheral side of the cylinder as the inflow side and the outer peripheral side as the outflow side, and the oil mist is collected and aggregated using the main filter medium and the auxiliary filter medium to discharge the fluid from the outflow side, and the main filtration is performed. The material / sub-filter material collects and the agglomerated oil is discharged from the outflow side.

(Examples 1 to 8)
The spacer 3 was created with the configuration shown in Table 1, and a pleated type filter in which the spacer 3 was inserted between the pleats was created. For the pleated fabric 2, a glass fiber non-woven fabric having a fiber diameter of 1.3 μm and a grain of 350 g / m ² sandwiched between PET spun non-woven fabrics having a grain of 20 g / m ² is used, and the pleated fabric is formed into a cylindrical shape to form an inner cylinder. , An outer cylinder, an outer winding filter medium, and an end plate were integrally formed to produce a pleated type filter having a pleated height of 20 mm and a pleated number of 45.
As shown in FIGS. 7 (a) and 7 (c), a to f in Table 1 show the height a of the spacer, the distance b from the valley to the open portion, the distance c from the valley to the beam, and the connection. The thickness d of the material, the thickness e from the end opposite to the outflow side folded portion of the pleated portion of the valley portion, and the protrusion distance f from the inner surface end of the open portion of the claw portion, r represents the beam portion 33 and the connecting material 34. It is the chamfering radius of the corner formed by the material, and the material is the material constituting the entire spacer.

The pleated type filters of Examples 1 to 4 were attached between the 5.5 kW refueling type reciprocating air compressor and the air receiver tank having a capacity of 250 L to remove the oil mist in the discharged air. At that time, 10 L / min of air was constantly discharged 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.
Further, as a comparative example, the above evaluation was performed using a similar pleated type filter in which no spacer was inserted between the pleats.

After each filter was used until it received 10,000 pulsations, the filters were disassembled and the condition of the pleated antinodes and spacers was observed.
In Examples 1 to 7, neither the pleated fabric nor the spacer was changed from the state before use.
It was found that the spacer of Example 8 was in a state where a slight bite was generated in the pleated fabric, and the amplitude generated in the pleated fabric due to the pulsation of air was excessively regulated. It is probable that the strength of the spacer was excessive for this evaluation condition.
In the spacer of Example 9, although the pleated fabric was not damaged, the open portions were in contact with each other even when the spacer was removed from the pleated fabric. It is probable that the strength of the spacer was insufficient for this evaluation condition.
In the pleated type filter in which the spacer was not inserted, the glass fiber non-woven fabric was torn at two points on the outflow side folded portion of the pleated fabric.

The spacer according to the present invention is used to prevent deformation caused by the flow resistance of a pleated type filter, and can be particularly suitably used for a filter that filters a fluid in which a flow rate change or a pressure change occurs frequently. Further, the filter using the spacer according to the present invention is an oil mist separator that removes oil mist in compressed air discharged from a refueling type air compressor, oil mist in exhaust discharged from an oil rotary vacuum pump, and the like. Can be suitably used as.

1,10 Filter 2 Pleated anti 21 Inflow side folded part 22 Outflow side folded part 23 Between pleated parts 3 Spacer 31 Open part 32 Valley part 33 Beam part 34 Connection material 35 Claw part 36 Unjoined part
4 Outer winding
5 end plate
6 Inner circumference side (inflow side)
7 Outer circumference side (outflow side)

Claims (4)

A spacer used for a pleated type filter that allows fluid to flow from one side surface to the other side surface, and is attached between the pleated portions on the other side surface side of the pleated beam and is attached between other adjacent pleated portions. A valley portion that does not contact and is arranged at a position facing the other side surface side of the inflow side folding portion of the pleated fabric, and an opening portion that is arranged at a position close to the outflow side folding portion of the pleated fabric. The connecting material having a beam portion arranged between the valley portion and the open portion and connecting the open portion and the beam portion is made of polypropylene or SUS304 having a thickness of 0.2 mm or more and 3.0 mm or less. Spacer . A spacer used for a cylindrically molded pleated type filter that allows fluid to flow from the inner peripheral side to the outer peripheral side. At a valley portion that does not come into contact with other spacers attached between the pleated portions of the pleated portion and is arranged at a position facing the inner peripheral side folded portion of the pleated fabric, and at a position close to the outer peripheral side folded portion of the pleated fabric. The connecting material having an open portion to be arranged and a beam portion arranged between the valley portion and the open portion, and connecting the open portion and the beam portion, has a thickness of 0.2 mm or more and 3.0 mm or less. Spacer made of pleated or SUS304 . The spacer for a pleated type filter according to claim 1 or 2 , wherein the open portion has a claw portion that limits elastic deformation of the connecting material due to deformation of the pleated fabric. An oil mist separator in which the spacer according to claim 1 to 3 is attached between the pleats.

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