JP2531568Y2 - Cartridge filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a filter used for removing impurities, fine particles and the like from water, chemicals and the like.

(Prior Art) When removing impurities, fine particles and the like from water and chemicals, a cartridge filter may be used.

FIG. 5 shows an example of a conventional element exchange type cartridge filter, in which a filtrate outlet 221 'of a case header 2' having a stock solution inlet 21 'and a filtrate outlet 22' is provided.
The end 31 ′ of the filtrate collecting port of the filter element 3 ′ is inserted with the O-ring m in between, and the filter element 3 ′ is housed in the cylindrical case 1 ′.
The case header is screwed into the upper opening of the.

In this element exchange type cartridge filter, the filter element 3 'and the case header 2'
Is detachable, and unlike the disposable type (type in which the filter element and the case header are integrated by welding or the like), only the filter element 3 'can be replaced. Therefore, even if the filter element 3 'becomes unusable due to clogging or the like, unlike the disposable type, the entire element does not need to be replaced, and only the filter element 3' needs to be replaced, and the case can be used as it is. It is cost effective.

(Problem to be Solved) However, in the above-mentioned element exchange type cartridge filter, the O-ring m comes into contact with the undiluted solution or the filtrate, and depending on the properties of this solution, elution of a trace component from the O-ring cannot be avoided. In addition, the quality of the filtrate decreases and the sealing property of the O-ring decreases. For example, in the process of cleaning a semiconductor silicon wafer, a chemical solution such as sulfuric acid or nitric acid is used in a circulating manner, and fine particles included in the cleaning are removed by filtration.
Although trace amounts of fine particles must also be removed, elution of the trace components from the O-ring by the strong acid is unavoidable with the above-mentioned element-exchange type cartridge filter, and it is difficult to use the filter for the chemical solution in the washing step.

An object of the present invention is to improve the connection structure between the case header and the filter element in the above-mentioned element-exchange type cartridge filter, so that the disadvantages of the above-mentioned O-ring system, that is, deterioration of the liquid quality of the filtrate, generation of liquid pool,
An object of the present invention is to eliminate dropouts and the like during replacement of a filter element.

(Means for Solving the Problems) In the cartridge filter of the present invention, a filter element is accommodated in a case, and an end of a filtrate collecting port of the filter element is communicated with a filtrate outlet of the case. The end of the filtrate collection port of the element is formed by a tube, the filtrate passage port of the case is formed into a tubular shape having a cap nut screw groove on the outer peripheral surface, and the filtrate collection port end tube is connected to the filtrate passage port tube of the case. Or a filter element, wherein a cap nut is screwed into a cap nut screwing groove of the mouth pipe part, and a ring on the filtrate collection port end tube part is tightened with the cap nut, or a filter element. The end of the filtrate collection port is formed by a tube, and the filtrate flow path port of the case is formed in a tubular shape with a groove for screwing a cap nut on the outer peripheral surface and a tapered end surface. And the tip of the filtrate collection port end tube part is flared and inserted on the tapered surface of the header of the filtrate flow channel opening of the header, and the tapered surface of the inserted tube tip and the distal end of the filtrate flow channel opening is formed. Are tightened by a cap nut screwed into the cap nut screwing groove of the mouth tube portion.

(Explanation of embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

 FIG. 1 is an explanatory view showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a cylindrical case having an upper end opening.
Reference numeral 2 denotes a case header that is screwed to the upper end of the cylindrical case 1 and includes a stock solution inflow path 21 and a filtrate outflow path 22, and a filtrate outflow port 221 is formed in an annular shape having a screw groove 222 on the outer peripheral surface. . 211 is an air vent hole. Reference numeral 3 denotes a filter element housed in the cylindrical case 1, and the filtrate collection port end 31 is formed by a tube. Reference numeral 4 denotes a ring inserted through the tube 31, and reference numeral 5 denotes a cap nut. The cap nut 5 is screwed into the filtrate outlet tube portion 221 of the case header 3, and the ring 4 is connected to the tube 31 by tightening the nut 5. I'm nervous. The ring 4 may be provided integrally with the tube 31.

In the above, the case 1 including the case header 2, the filter element member including the filtrate collection port end tube portion 31, the ring 4, the cap nut 5, etc. are made of a plastic having excellent chemical resistance, for example, polypropylene, fluororesin,
For example, it is formed from PFA, FEP, ETFE, or the like.

The filter element 3 is usually a pleated type. As shown in FIG. 2, membranes b and b having a hole at the center are attached to both sides of a support disk a having a filtrate passage, and the inner and outer peripheral edges of the membrane are supported by the support disks. a, the unit c thus formed is stacked and integrated via a spacer d, an end plate 2a having a filtrate outlet 32 is fixed integrally to the stack, and the filtrate outlet 32 is connected to the end plate 2a. tube
Alternatively, a disk type in which the end plate 2b for a hole is fixed to the other end of the stack by welding the hole 31 and a liquid collecting port e is secured in the center can be used. The filtrate outlet 32 and the tube 31 may be integrated.

In the above, a ring 4 may be used in which the distal end surface 41 is a tapered surface as shown in FIG. 3A, and the tapered surface 41 is provided with slits 42 for reducing the diameter. FIG. 3B shows a connection structure between the filtrate outlet pipe section 221 of the case header 2 and the filtrate collecting port end tube section 31 of the filter element 3 using the ring 4 and the cap nut 5 shown in FIG. 3A. ing.

FIG. 4 shows another embodiment of the present invention, in which the end of the filtrate collecting port end tube portion 31 of the filter element 3 is flared without using the ring 4 and the filtrate outlet pipe of the case header 2 is formed. The tip of the portion 221 is formed as a tapered surface 223 that conforms to the flare surface. The flare surface 310 of the filtrate collection port end tube portion 31 of the filter element 3 abuts on the tapered surface 223, and the cap nut 5 is tightened. The contact surface is under pressure.

In addition, the present invention has a cartridge filter having a stock solution inlet on the case bottom side, a filtrate outlet on the case upper end side (header side), a stock solution inlet on the case upper side, and a filtrate outlet on the case bottom side, respectively. Also applicable to cartridge filters.

(Effects of the Invention) The cartridge filter of the present invention has the same configuration as described above, and is connected to the filtrate outlet tube of the case header and the filtrate collecting port end of the filter element by a ring tightening method or a flare connection method using a cap nut. Since it is connected to the tube part, it can be connected and removed freely without an O-ring between them, and while maintaining the interchangeability of the filter element alone, the quality of the filtrate by elution of impure components from the O-ring Drop can be prevented. Further, since the filtrate outlet port of the case header and the filtrate collecting port end tube of the filter element can be connected to each other by smoothing the inner surface in the same manner as a normal pipe connection, it is possible to prevent the generation of a filtrate pool and to prevent the filtrate from being retained. The deterioration of the filtrate due to is avoided.
Further, since the filter element can be sufficiently firmly supported by the tightening force of the cap nut, as in the above embodiment,
If the filtrate outlet to which the filtrate collection port end of the filter element is connected is at the top end of the case, when removing the case and replacing the filter element with the cartridge filter connected to the piping, the filter element will lose its own weight. It is safe to prevent falling off.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention, FIG. 2 is an explanatory view showing an example of a filter element used in the present invention, and FIG. 3A is an explanatory view showing another example of a ring used in the present invention. FIG. 3B is an explanatory view showing a main part of another embodiment of the present invention using the ring shown in FIG. 3A. FIG. 4 is an explanatory view showing another main part of another embodiment of the present invention. FIG. 5 is an explanatory view showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Cylindrical case, 21 ... Undiluted solution inflow path, 22 ... Filtrate outflow path, 221 ... Filtrate outflow tube part, 222 ... Groove for screwing a cap nut, 3 ... Filter element, 31 ... Filtrate collection Water end tube section, 310 ... Tapered surface at the end of filtrate collection end tube section, 4 ... Ring, 5 ... Cap nut.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-254217 (JP, A) JP-A-59-30809 (JP, U) JP-A-1-132208 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A header having an undiluted solution inflow passage and a filtrate outflow passage is attached to an upper end of a cylindrical case, and a filter element is accommodated in the cylindrical case. In the filter connected to the filtrate outlet of the header, the end of the filtrate collecting port of the filter element is formed by a tube, and the filtrate passage port of the header is formed in a tubular shape having a cap nut screw groove on the outer peripheral surface. Then, insert the filtrate collection port end tube portion into the filtrate flow passage port tube portion of the header, screw a cap nut into the cap nut screwing groove of the mouth tube portion, and seal the ring on the filtrate collection port end tube portion. A cartridge filter characterized by being tightened by a nut. 2. A header having a stock solution inflow passage and a filtrate outflow passage is attached to an upper end of a cylindrical case, and a filter element is accommodated in the cylindrical case. In the filter connected to the filtrate outlet of the header, the end of the filtrate collecting port of the filter element is formed by a tube, and the filtrate passage opening of the header is provided with a groove for screwing a cap nut on the outer peripheral surface and the tip surface is tapered. The filtrate collecting port end tube section is flared and inserted into the tapered surface of the header of the filtrate channel opening of the header, and the inserted tube section tip and the filtrate channel opening tube are formed. A cartridge filter characterized in that a tapered surface at the tip is pressed by a cap nut screwed into a cap nut screwing groove of the mouth tube portion.