JPS6363244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chemical-resistant filter in which the casing has a double structure, the inner side is made of fluororesin, which is a chemical-resistant resin, and the outer side is fitted with metal.

When manufacturing precision products using an acid or alkaline solution as a cleaning liquid, a clean cleaning liquid that does not contain dust or metal ions is required, and for this reason, a filter is installed in the flow path of the cleaning liquid. The casing of this filter is made of stainless steel, which has good chemical resistance, corrosion resistance, and durability due to the properties of the cleaning liquid. However, when certain acids or alkalis are used as cleaning fluids, metal ions may be eluted from the stainless steel material of the casing, polluting the cleaning fluid. Removal of these metal ions is difficult and requires complicated and large equipment. For this reason, measures have been taken to coat the inside of the casing with a resin having excellent chemical resistance, such as fluororesin.

This coating method includes a coating method in which a dispersion resin is sprayed onto the inside of the casing and melted by heat, and a lining method in which a resin sheet is pasted inside the casing. However, it is difficult to apply these measures to complicated parts of the casing, such as filter pipes, and the stainless steel material in these parts is likely to come into contact with the cleaning liquid. Furthermore, since the adhesion between the stainless steel material and the resin is poor, it is easy to peel off, causing wrinkles in the resin, creating gaps between the stainless steel material and the stainless steel material, causing the resin to tear and come into contact with the cleaning solution, causing metal ions to be eluted. Furthermore, there is a drawback that corrosion progresses over time at the points in contact with the cleaning liquid, resulting in liquid leakage from the casing. However, when the casing is formed only from resin without using stainless steel, there is a drawback that the casing lacks strength.

The present invention provides a filter with excellent chemical resistance that eliminates these drawbacks. , a lower casing formed by fitting a cylindrical metal body with an opening in the bottom wall and an open top end, and a disc-shaped upper surface of a resin cover made of a disc-shaped chemical-resistant resin and having an outlet pipe. This is a chemical-resistant filter in which a chemical-resistant overbody is disposed within a housing formed by wrapping an upper casing with a metal cover fitted thereon.

To explain the following with reference to an embodiment, FIG. 1 shows a filter 1 according to the present invention, in which a housing formed of a cylindrical lower casing 2 having an inlet pipe 4 and a disc-shaped upper casing 3 having an outlet pipe 5 includes:
It consists of an overbody 6, a contracted spring 7, and a gasket 8. The lower casing 2 consists of a cylindrical resin casing 11, a cylindrical stainless steel casing 12, and a snap ring 13, as shown in FIG. The resin casing 11 has a cylindrical body 14, an annular flange 15 extending outward from the open portion of the body 14, and an inlet pipe 4 at the center of the bottom of the body 14. The inlet pipe 4 has an annular groove 16 on the outer periphery near the bottom of the body 14 and a bulge portion 17 at the extreme end. Stainless steel casing 12
The body 18 has an inner diameter that is approximately the same as the outer diameter of the body 14 of the resin casing 11, an annular flange 19 that has the same diameter as the flange 15 of the resin casing 11 or extends further outward from the open part of the body 18, and a resin Each has a rising portion 20 extending from the opening periphery at the bottom of the casing 11, which is approximately equal to the outer diameter of the inlet pipe 4, to the upper side of the annular groove 16 of the inlet pipe 4. The snap ring 13 has a diameter larger than the inner diameter of the rising portion 20 of the stainless steel casing 12 and a thickness equal to the width of the annular groove 16. The lower casing 2 has a double structure in which an annular snap ring 13 is clamped into an annular groove 16 of the inlet pipe 4 of the resin casing 11 in order to tightly fix the resin casing 11 and the stainless steel casing 12. The upper casing 3 is
As shown in Fig. 3, a disc-shaped resin casing 2
1, a disc-shaped stainless steel casing 22, and a snap spring 23. The disc-shaped resin casing 21 includes a body 24 and the resin casing 11.
The body 24 has an annular flange 25 having the same diameter as the flange 15, and an outlet pipe 5 at the center of the body 24. The outlet pipe 5 has an annular groove 26 on the outer periphery near the body 24.
and a bulge portion 27 at the extreme end. The disc-shaped stainless steel casing 22 includes a body 28 , an annular flange 29 having the same diameter as the flange 19 of the stainless steel casing 12 , and a lower side of the annular groove 26 of the outlet pipe 5 from the periphery of the central opening equal to the outer diameter of the outlet pipe 5 of the resin casing 21 . It has a rising portion 30 up to the end. The diameter of the snap ring 23 is larger than the inner diameter of the rising portion 30 of the stainless steel casing 22;
It has a thickness equal to the width of the annular groove 26. The upper casing has a double structure in which an annular snap ring 23 is clamped into an annular groove 26 of the inlet pipe 5 of the resin casing 21 in order to tightly fix the resin casing 21 and the stainless steel casing 22. The lower casing 2 is manufactured as shown in FIG. A cylindrical body 14, an annular flange 15 extending outward from the open part of the cylindrical body 14, and a bulge part 17 with the length of the inlet pipe 4 at the bottom of the body 14 are formed by molding or cutting a chemical-resistant resin material. A cylindrical resin casing 11 is formed, each having a cylinder 31 with a diameter larger than the outer diameter. (Fig. 4a) Separately, a body 18 having an inner diameter approximately the same as the outer diameter of the body 14 of the resin casing 11 is formed by pressing or the like, and a body 18 having the same diameter as the flange 15 of the resin casing 11 or further outside the opening A cylindrical stainless steel casing 12 is formed having an annular flange 19 extending in the direction and a rising portion 20 from the opening periphery having approximately the same diameter as the cylinder 31 of the resin casing 11. (Fig. 4b) Next, the resin casing 11 is inserted into the stainless steel casing 12, and an annular groove 16 is cut on the outer surface of the cylinder 31 of the resin casing 11 at the position of the rising portion 20 of the stainless steel casing 12. The inlet pipe 4 is formed by cutting together with the through hole 32 to a diameter corresponding to the inner diameter of a connecting hose (not shown). (Fig. 4c) Then, a snap ring 13 having a diameter larger than the inner diameter of the rising part 20 of the stainless steel casing 12 is fitted into the annular groove 16 of the resin casing 11, and the resin casing 1
1 and a stainless steel casing 12 are closely fixed to produce a lower casing 2.

The upper casing 3 is manufactured in the same manner as the lower casing 2. As shown in FIG. 5, a disc-shaped body 24 is formed by molding or cutting a chemical-resistant resin material, a flange 25 having the same diameter as the flange 15 of the resin casing 11, and an outlet pipe 5 at the center of the carved body 24. The resin casing 2 has a cylinder 41 with a length corresponding to that and larger than the outer diameter of the bulge part 27.
form 1. (Fig. 5a) Separately, press etc. to form the body 28, a flange 29 having the same diameter as the flange 19 of the stainless steel casing 12, and a rising portion 30 from the opening periphery having approximately the same diameter as the cylinder 41 of the resin casing 21. A disc-shaped stainless steel casing 22 is formed. (Fig. 5b) Next, the resin casing 21 is inserted into the stainless steel casing 22, and an annular groove 26 is cut on the outer surface of the cylinder 41 of the resin casing 21 at the position of the rising portion 30 of the stainless steel casing 22. The through hole 42 has a diameter corresponding to the inner diameter of a connecting hose (not shown).
The outlet pipe 5 is formed by cutting the same. (Fig. 5c) Then, a snap spring having a diameter larger than the inner diameter of the rising portion 30 of the stainless steel casing 22 is inserted into the annular groove 26 of the resin casing 21 to tightly fix the resin casing 21 and the stainless steel casing 22, and then the upper casing 3 is assembled. Manufacture.

In this manufacturing process, the annular grooves 16, 26 and the through holes 3 are formed in the resin casings 11, 21 before inserting them into the stainless steel casings 11, 21.
2, 42 may be formed. The cylindrical resin casing 11 has a cylindrical body 14, an annular flange 15 extending outward from the opening, and an inlet pipe 4 having an annular groove 16 and a bulge 17 near the center of the bottom of the body 14. By pouring resin into a mold and integrally molding, a disc-shaped resin casing 21 is formed.
is a body 24, an annular flange 25 having the same diameter as the flange 15 of the resin casing 11, and a body 24.
4. Resin may be poured into a casing mold having the shape of each outlet pipe 5 having an annular groove 26 and a bulge portion 27 near the center thereof to form an integral mold.

A spring 7, a chemical-resistant overbody 6, and a gasket 8 are arranged in the lower casing 2 manufactured in this way, and the flanges 19, 29 of the stainless steel casings 12, 22 of the lower casing 2 and upper casing 3 are attached. Laminated resin casing 11, 2
The chemical-resistant filter 1 is formed by liquid-tightly winding it together with the flanges 15 and 25 of 1. Sho spring 7
is covered with a chemical-resistant resin, and the gasket 8 is made of chemical-resistant resin.

In the chemical-resistant filter 1 having such a configuration, a cleaning liquid such as acid or alkali sent from a pump (not shown) flows into the housing from the inlet pipe 4, and the overbody 6 removes dust and the like contained in the cleaning liquid. and is sent out via the outlet pipe 5. The inlet and outlet pipes 4, 5 of the filter 1 and the inside of the housing, which come into contact with the cleaning liquid, are all uniformly covered with chemical-resistant resin, so there is no contact between the stainless steel material and the cleaning liquid, thus preventing contamination of the cleaning liquid due to elution of metal ions. There isn't. In particular, since the inlet and outlet pipes 4 and 5 themselves are made only of resin, there is no contamination of the cleaning fluid due to elution of metal ions in the connecting hose, and the durability is excellent. Prevents resin defects and wrinkles during coating and lining methods.
By fitting the snap springs 13, 23 into the annular grooves 16, 26, the upper and lower casings 2, 3 can be securely tightened, and the filter 1 in which the resin material and the stainless steel material are tightly bonded can be manufactured. becomes. When inserting the hose in this state, the snap springs 13 and 23 connect the resin inlet and outlet pipes 4 and 5 and the stainless steel casing 12,
22, so it can be inserted securely without moving.

As described above, the chemical-resistant filter of the present invention has a double-layered casing, with the inside of the casing that comes in contact with the cleaning liquid and the inlet/outlet pipe made of resin, and the outside of the casing that comes into contact with the outside made of stainless steel. In addition to being able to prevent elution, the resin casing can be protected and the durability of the filter can be increased, making it possible to provide a filter that is suitable for use with cleaning fluids used in precision products.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a chemical-resistant filter of the present invention.
FIG. 2 is a sectional view of the lower casing of the chemical-resistant filter. FIG. 3 is a sectional view of the upper casing of the chemical-resistant filter. Figure 4 shows the manufacturing process of the lower casing. Figure a shows the resin casing. Figure b shows the stainless steel casing. Figure c is the lower casing. Figure 5 shows the manufacturing process of the upper casing. Figure a shows the resin casing. Figure b shows the stainless steel casing. Figure c is the upper casing. 1...Chemical resistant filter, 2...Lower casing, 3...Upper casing, 4...Inlet pipe, 5
... Outlet pipe, 6 ... Overbody, 11, 21 ...
Resin casing, 12, 22...Stainless steel casing, 13, 23...Snat spring.

Claims (1)

[Claims] 1. A cylindrical metal body with an opening in the bottom wall and an open top end is fitted onto the outer periphery of a cylindrical resin body made of chemical-resistant resin with an inlet pipe in the bottom wall and an open top end. A housing formed by rolling together a lower casing consisting of a metal cover made of a chemical-resistant resin having an outlet pipe, and an upper casing formed by fitting a disk-shaped metal cover having an opening on the top surface of a resin cover made of a disk-shaped chemical-resistant resin and having an outlet pipe. A chemical-resistant filter with a chemical-resistant filter inside.