JPH0626324Y2 - Sanitary filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a filter for filtering a beverage or a liquid food / beverage ingredient.

[Prior Art] A sanitary filter for filtering a beverage or a liquid food / beverage raw material is washed with high-pressure water in order to completely remove non-filtered substances clogging the filter medium.

The above-mentioned known filter normally filters the liquid to be filtered from the outside to the inside of the cylindrical filter medium having a large number of folding folds, but the filter medium made of a fine mesh stainless steel mesh is itself. Since the shape-retaining force of (1) is small, a tube having a large number of small holes is provided inside to provide shape-retaining property.

To wash the filter medium, it is necessary to pass high-pressure wash water from the inside to the outside of the filter medium, which is opposite to the flow of the liquid to be filtered. In addition, if a tube having the above-mentioned small holes is provided on the outer circumference of the filter medium for shape retention, the foreign matter removed by washing will be incompletely discharged, so that it cannot be washed completely in any case. There's a problem.

In order to solve this problem, a filter in which a reinforcing coil is wound around the outer periphery of a folding fold of a filter medium at a coarse pitch is proposed in Japanese Utility Model Laid-Open No. 56-28714. This proposed filter can receive the fluid pressure of the washing water flowing from the inside to the outside of the filter medium by the reinforcing coil, and further, the contact area between the coil and the filter medium is small so that the filter medium can be completely washed. There is a problem in that the filter material is greatly worn and the life of the filter is short.

The cause of the short life of the filter is that the temperature difference during cleaning causes a difference in expansion between the coil and the filter medium, which causes friction between the coil and the filter medium to move the filter medium formed of thin stainless wire. This is because.

However, when it is attempted to fix the filter medium and the reinforcing coil by welding, holes are formed in the mesh formed by thin lines, so that the filter medium and the reinforcing coil cannot be firmly fixed.

[Problems to be Solved by the Invention] The problem to be solved by the present invention is to provide a sanitary filter which can be cleaned at high pressure and in which the filter medium is less worn by cleaning.

[Means for Solving the Problems] In order to solve the above problems, the sanitary filter of the present invention has a tube having a large number of small holes and an axial end of a filter medium having a large number of folding folds provided on the outer circumference of the tube. To
In the sanitary filter fixed to the end plate,
An end portion of a reinforcing coil wound around the outer periphery of a folding fold on the filter medium is fixed to the end plate, and the reinforcing coil and a plurality of reinforcing members arranged outside the reinforcing coil over the entire axial length of the coil, It is characterized in that they are fixed by welding at mutual contact portions.

[Operation] A reinforcing coil whose end portion is fixed to the end plate and a plurality of reinforcing members arranged outside the coil over the entire length in the axial direction of the coil are fixed by welding at mutual contact portions of the reinforcing coil. By reliably controlling the movement, there is no relative movement due to the expansion difference between the reinforcing coil and the filter medium,
Since there is no damage due to friction between the filter medium and the coil due to cleaning, the life of the sanitary filter can be extended.

Further, since there is a gap corresponding to the diameter of the reinforcing coil between the reinforcing material and the filter material, the cleaning of the filter material will not be hindered even if the reinforcing material is provided.

[Embodiment] The drawings show an embodiment of the present invention.
Is a tube 2 having a large number of small holes 2a, ..., A filter medium 3 on the outside thereof, a pair of end plates 4 and 4 and rings 5 and 5 welded at both ends thereof, and wound around the outer periphery of the filter medium 3 at a coarse pitch. The reinforcing coil 6 that is rotated and a pair of reinforcing members 7 and 7 that are arranged axially opposite to each other on the outer side of the reinforcing coil 6 in the radial direction are provided, and these are formed of stainless steel.

The filter medium 3 is formed into a cylindrical shape having folding folds by winding a fine mesh stainless steel net folded at a desired width around the outer circumference of the tube 2.
Between the folding ends of the filter medium 3, both axial ends of the filter medium 3 and the tube 2, end plates 4, 4 and rings 5, 5, reinforcing coil
Both ends of 6 and the rings 5, 5 and the contact portions of the reinforcing coil 6 and the reinforcing members 7, 7 are welded by argon welding.

As shown in FIG. 1, the sanitary filter 1 has a joint plate 9 and a joint plate 9 at one axial end of the filter medium 3 and the tube 2.
9 is welded, the joint plates 9 and 9 are welded, and the filter medium 3
It is also possible to connect a plurality of axially.

Reference numeral 10 in FIG. 1 denotes packing provided in the opening of the end plate 4.

The filter 1 filters the liquid to be filtered by allowing the liquid to be filtered to pass inward from the outer periphery of the filter medium 3, and the filtered liquid is discharged from the end plate 4. In this case, since the filter medium 3 is supported by the tube 2 having the small holes 2a, ..., It will not be deformed even if its shape retention force is small.

Further, the fluid pressure of the wash water flowing from the outside to the inside of the filter medium 3 at the time of cleaning the filter is supported by the tube 1 like the liquid to be filtered, and the fluid pressure of the wash water flowing from the inside to the outside of the filter medium 3 is Since it is supported by the reinforcing coil 6, the filter medium 3 is not deformed or damaged even when washed with high-pressure water, and the contact area between the reinforcing coil 6 having a coarse pitch and the folding fold of the filter medium 3 is extremely large. Since it is small, it does not hinder cleaning.

Further, the reinforcing coil 6, since the axial movement of the filter medium 3 is restricted by the pair of reinforcing members 7, 7, wear of the filter medium 3 due to the relative movement of the reinforcing coil 6 and the filter medium 3 during cleaning is small, Therefore, the service life of the filter 1 can be extended, and the reinforcing coil 6 is provided between the reinforcing members 7 and 7 and the filter member 3.
Since there is a gap corresponding to the diameter of the filter medium 3, even if the reinforcing members 7 and 7 are provided, there is no hindrance to the cleaning of the filter medium 3.

[Advantages of the Invention] The sanitary filter of the present invention has a filter medium and a reinforcing coil in which a reinforcing coil having an end portion fixed to an end plate and a contact portion of a plurality of reinforcing members arranged over the entire axial length thereof are welded to each other. By controlling the relative movement with the filter, there is no damage due to friction between the filter medium and the reinforcing coil due to cleaning,
The reinforcing coil can prolong the life of the filter that withstands high-pressure washing.

Moreover, since the reinforcing material is provided outside the reinforcing coil, the reinforcing material does not hinder the cleaning of the filter medium.

[Brief description of drawings]

FIG. 1 is a front view of a half section of an embodiment of the present invention, and FIG. 2 is a plan view of the same. 1 ... Sanitary filter, 2 ... Tube, 2a ... Small hole, 3 ... Filter material, 4 ... End plate, 6 ... Reinforcing coil, 7 ... Reinforcing material.

Claims (1)

[Scope of utility model registration request] 1. A sanitary filter having a tube having a large number of small holes and an axial end of a filter medium having a large number of folding folds provided on the outer periphery of the tube fixed to an end plate, the outer periphery of the folding fold of the filter medium. The end portion of the reinforcing coil wound around the end plate is fixed to the end plate, and the reinforcing coil and a plurality of reinforcing members arranged outside the reinforcing coil over the entire axial length of the coil are welded at mutual contact portions. A sanitary filter characterized by being fixed.