JPH0621528Y2 - Pressure resistant filter element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement in a tubular filter element.

[Conventional technology]

In order to efficiently remove fine foreign matter in a fluid, for example, a cylindrical filter element using a sintered body obtained by sintering metal fitting powder or metal fitting fiber as a filter medium has been conventionally used. Filter media can promote the miniaturization of pores,
Further, since it has excellent heat resistance, it has been widely adopted in recent years, for example, for polymers.

By the way, in such a sintered filter medium, it is easy to cause a so-called clogging phenomenon in which pores of the filter medium are clogged with the processing time, and it is necessary to wash the filter medium by backwashing each time, but at the present time, It is said that the filter element used is preferably formed as thin as possible in order to improve its filtering characteristics.

Therefore, in the case of a thin element, when performing a normal filtration treatment or the backwash treatment, there is a drawback that cracks easily occur in the filter medium due to the treatment pressure, in order to improve these,
For example, Japanese Utility Model Laid-Open No. 56-28714 discloses a cylindrical filter element in which a holder formed by winding a wire into a coil is attached to the outer periphery of a filter cylinder.

[Problems to be Solved by the Invention] However, the holder disclosed in the above publication is formed by simply forming a wire rod into a coil, and when the holder is actually mounted around the filter tube, the filter tube is thin. Since it is a body, it is difficult to wind it tightly, so there is a drawback that a gap is likely to occur between the filter cylinder and the holder.

For this reason, when performing the above-mentioned filtration treatment by this,
By the time the holding tool begins to receive the filtrate pressure, a crack occurs in the filter cylinder, which hinders the subsequent work.

Further, the above-mentioned publication also discloses that the filter cylinder is elastically clamped by adjusting the inner diameter of the holder, but in this case as well, it is difficult to attach the holder, and during the mounting work. However, there is a problem that the surface of the filter cylinder is easily damaged.

An object of the present invention is to provide a filter element equipped with a pressure-resistant device that can be easily attached without forming a gap between the filter cylinder and surely act on the processing pressure.

[Means for solving problems]

In order to achieve the above object, the pressure-resistant filter element of the present invention comprises a pressure-resistant device which is elastically pressed against the cylindrical filter cylinder and spirally wound around the filter cylinder. It is provided.

[Action]

Since such a pressure-resistant device that presses the filter cylinder elastically can expand and contract in the longitudinal direction due to its elasticity, it can be easily attached to the periphery of the filter cylinder, and damage to the filter cylinder at the time of the attachment is prevented. Can be significantly reduced. Further, after the attachment, the filter cylinder is elastically pressed, so that the processing pressure can be surely carried and damage to the filter cylinder due to the processing pressure can be prevented.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In the figure, the pressure-resistant filter element 1 of the present invention is
The filter barrel 2 has a tubular shape, and a pressure-resistant tool 3 which is wound in a spiral shape so as to be in tight contact with the periphery of the filter barrel 2, and metal fittings are attached to both ends of the filter barrel 2. In this example, the metal fittings are a cap metal fitting 5 which is provided at one end of the filter cylinder 2 and closes one opening of the filter cylinder 2, and a boss metal fitting 7 at the other end having an outlet 6 communicating with a suction pump or the like. Each of them is watertightly attached by welding or the like.

In this example, the pressure-resistant filter element 1 is provided with a filter cylinder 2 for removing the liquid stored outside by the operation of the suction pump.
And is sucked into the inside thereof to remove impurities in the liquid by filtration, and the filtered filtrate is supplied through the outlet 6 to the next step.

Further, the pressure-resistant device 3 acts during the backwashing process performed when the filtration 2 is clogged by the impurities, and the cleaning treatment liquid supplied at a high pressure from the outlet 6 to the inside of the filter barrel 2 extends. By carrying a processing pressure in the radial direction, the filter cylinder 2
It is provided to prevent swelling, cracking, etc.

In this example, the filter cylinder 2 is a porous sintered body formed by molding metal powder such as stainless steel or nickel alloy, metal fiber or the like into a cylindrical shape, and its peripheral wall has fine pores for filtration. It has. Since stainless steel is excellent in corrosion resistance and heat resistance, it is particularly suitable as a material for forming a filter cylinder, and the cross-sectional shape of the filter cylinder 2 is elliptical or polygonal in addition to circular as in this example. It may have a non-circular shape such as.

Further, a pressure-resistant tool 3 is attached to the periphery of such a filter cylinder 2, that is, the outer circumference in this example.

In this example, the pressure-resistant tool 3 is a corrugated wire rod 1 formed by repeatedly bending a wire rod 1 made of stainless steel or the like in a zigzag shape with a predetermined pitch width W and a pitch length L, that is, in a direction different from its longitudinal direction.
0, and the corrugated wire 10 has elasticity in the longitudinal direction and can expand and contract.

Further, the corrugated wire 10 has one end fixed to the vicinity of one outer edge of the filter tube 2 or the outer surface of the cap metal fitting 5 by welding or the like, and extends on the outer periphery of the filter tube 2 while having a predetermined tension. The pressure-resistant tool 3 is formed by spirally winding it around the other end and welding the other end to the vicinity of the other outer edge or the outer peripheral surface of the boss metal fitting 7.

Therefore, the pressure-resistant tool 3 urges the filter cylinder 2 toward the center by the tension in the winding of the corrugated wire 10 to elastically press the filter cylinder 2, and the corrugated wire 10 has. Due to its elasticity, the filter tube 2 accompanying the winding work
The abnormal pressurization to the filter cylinder 2 can be alleviated, and the filter cylinder 2 can be wound easily and closely without damaging it.

Since such a corrugated wire 10 has a relatively high elastic force and has excellent flexibility in the thickness direction, it is possible to wind and press the non-circular filter cylinder 2 in close contact, Moreover, since it is easy to manufacture, it can be used particularly suitably as the pressure resistant tool 3.

Further, the pitch length L and the pitch width W of the pressure-resistant tool 3
Is pre-determined from the processing pressure conditions together with the elastic modulus and thickness of the wire rod 11. For example, the pressure-resistant filter element 1 has a diameter of 65 mm and a length of 250 mm.
When a back pressure of about kg / mm ² is applied, a wire rod 11 made of stainless steel hard wire having a diameter of about 1.2 mm is formed into a waveform with a pitch width W5 mm and a pitch length L13.5 mm. Wrap it with a pitch of 30 mm and applying some tension. In order to prevent the wire rod 11 from being cut off due to disconnection or the like, it is preferable that the corrugated convex portion P is formed as a rounded arc, and the wire rod 11 reduces the contact area with the surface of the filter cylinder 2 and reduces the wire rod. It is preferable that the cross-sectional shape thereof be formed into, for example, a circular shape or a rhombic shape so that the pressing can be performed uniformly by improving the slip of 11 and the line contact is made. The reduction of the contact area also helps prevent the reduction of the filtration area.

However, in the pressure resistant filter element 1 of the present invention, the external fluid is permeated into the inside of the filter cylinder 2 by the operation of the suction pump passing through the water inlet 6, and the liquid is filtered at the time of permeation. When the filter cylinder 2 is clogged, a high-pressure treatment liquid for cleaning is supplied from the water introducing port 6 into the filter cylinder 2,
The filter cylinder 2 is cleaned by the permeation pressure of the treatment liquid and the impurities flowing out to the outside. Further, the processing pressure applied to the filter cylinder 2 by the high-pressure supply of the processing liquid can be carried by the pressure-resistant tool 3 which is in close contact with the filter cylinder 2 and presses the outer circumference thereof.
It is possible to prevent the occurrence of troubles such as swelling and cracks.

Since the suction pressure in the filtration process is generally low, it is not necessary to reinforce the filter cylinder 2 with respect to the suction pressure.
For example, when the suction pressure is increased and the filtration processing capacity is improved, the pressure resistant member 3 can be provided on the inner circumference of the filter cylinder 2. In such a case, the corrugated wire 10 is wound around the inner circumference while contracting. Also pressure resistant filter element 1
May be used as it is subjected to a filtration process when permeating from the inside of the filter tube 2 to the outside.

Further, the pressure-resistant tool 3 in this embodiment has a relatively wide pitch width W.
Since it has a substantially strip-like shape, the surface of the filter cylinder 2 can be substantially covered by winding it at a relatively narrow interval, and the surface of the filter cylinder 2 can be prevented from being damaged by an impact such as handling thereof. It also helps improve aesthetics. Moreover, even in such a case, since the pressure-resistant tool 3 is formed of the corrugated wire rod 10, the filtration area is not extremely reduced and the permeation of the treatment liquid or the like is not damaged.

FIG. 3 shows another embodiment of the pressure resistant tool 3.

In the figure, the pressure-resistant tool 3 is formed by continuously forming a loop body that bends the wire material 11 at a predetermined pitch width W and pitch length L, and repeatedly folds the wire material 11 in a direction different from the length direction to form a corrugated loop. The wire rod 10 is used. This can also have the same operation and effect as those of the above-mentioned embodiment.

Further, the idea of the present invention can be applied to, for example, a tubular filter element with pleats or the like.

[Effect of device]

As mentioned above, since the pressure-resistant filter element of the present invention uses the pressure-resistant tool that elastically presses the filter cylinder,
The processing pressure acting on the filter cylinder can be surely carried, and troubles such as bulging and cracking of the filter cylinder due to the processing pressure can be prevented. Further, the pressure resistant device can be expanded and contracted in the longitudinal direction due to its elasticity, so that it can be easily attached without damaging the filter cylinder such as scratches.

Moreover, since the pressure-resistant tool made of the corrugated wire can give relatively high elasticity, it can be used for pressure-resistant filter elements for various purposes, and since it is easy to manufacture, it improves productivity and production cost. Also helps to reduce Further, in the above-mentioned Japanese Utility Model Laid-Open No. 56-28714, in order to press the filter medium in a wide range, it is necessary to wind it at a high density, whereas in the present application, the corrugated wire rod makes it easy in a wide range. The filter medium can be pressed against.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an enlarged plan view of a part of a pressure resistant device, and FIG. 3 is an enlarged plan view of a part of another embodiment of the pressure resistant device. It is a figure. 2 ... filter cylinder, 3 ... pressure resistant device, 10 ... corrugated wire.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical filter cylinder, and a corrugated wire rod which is repeatedly bent and elastically expands and contracts in the longitudinal direction, is wound around the filter cylinder in a spiral shape, and both ends thereof are wound. A pressure-resistant filter element comprising a filter cylinder or pressure-resistant tools fixed to metal fittings attached to both ends of the filter cylinder.