JP3252919B2 - Filter unit and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a filter unit and a filter unit.
And a method for producing the same .

[0002]

2. Description of the Related Art Conventionally, when joining three or more plastic parts, a method of assembling the parts with a gasket such as an O-ring or a delta ring by a screwing method or a flange tightening method, or a simpler method than these methods. As a method, a method of sequentially welding two parts at a time has been adopted.

[0003]

However, the above-mentioned conventional joining methods have the following disadvantages. That is,
The joining method using a gasket has disadvantages such as the necessity of manufacturing parts having a complicated structure, an increase in the number of parts, and an increase in size. On the other hand, the welding method also has a drawback that, in the case of parts having close welding points, deformation of the parts is unavoidable if welding is repeated. In addition, repeating welding in accordance with the number of parts inevitably results in low productivity.

The present invention has been made with the object of reducing the number of parts, simplifying the structure of parts, and remarkably rationalizing the number of steps in joining.

[0005]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a filter is wound and supported.
Core, which accommodates this core and is connected to the outside around the filter.
A housing body forming a space to be a flow channel,
Outside that closes the opening of the jing body and communicates with the space inside the core
And a cover member forming a flow path connected to the filter unit.
In the knit, the core, housing body and lid member are the same.
Made of one plastic material and the housing body
A step is formed on the end face of the periphery of the mouth, and the step is fitted to the step.
The end that is flush with the end surface of the opening periphery of the housing body
A flange having a surface is provided on the core, and a step of the housing body is provided.
Form one end face by fitting the part and the flange part of the core
And face the end face of the lid member, and
The end faces of the opposing lid member, core and housing body
Are joined by welding .

Further, a method of manufacturing this filter unit
The plastic, core, housing body and lid
Edge of the peripheral edge of the opening of the housing body
Form a step on the surface and fit the step into the housing
Having an end surface flush with the end surface of the periphery of the opening of the body.
A flange is provided on the core, and the step of the housing body and the core
Form one end face by fitting with the flange
Core and housing in mating condition facing the end face of the material
Heat and melt the end face of the
Butted from each other .

[0007] The core, housing body and
One and two plastic parts for the lid member
In this case, it is essential that the plastic parts be divided so that the two groups can form a common joint surface that can be contacted.

Further, in order to make the fusion welding process of the two groups reliable and easy operation, in the group consisting of two or more parts, a fitting structure in which the parts forming the group can be fitted to each other is provided. By having and fitting, it can be handled as one part, and it is preferable that the operation is performed in the same manner as the operation of “fusing and welding two parts”. However, the fitting structure is not a requirement of the present invention.

In each group, when the surface including the contact surface that can be contacted is the joint surface itself, heat fusion welding is easy to be performed.
Even if one of the opposing surfaces including the joining surfaces of both groups is larger than the joining surface, a heat receiving surface is formed that can be heated and melted by the heating device installed between the two groups and welded after moving the heating device. It doesn't matter.

In addition, when the temperature of the joint surface is increased, it is preferable that the temperature of the component rises by receiving heat at the joint surface of each component forming the joint surface in each group and that the component temperature rise be substantially equal. obtain.

In the heating according to the present invention, any heating method can be used as long as the joint surface can be uniformly heated and melted. However, even when the melting temperature is low, a normal heater can be used even when the vibration welding method cannot be used due to its structure. Has features. When the melting temperature is high, an infrared heater or a far infrared heater is particularly effective.
In addition, it is a matter of course that selection of the size and shape of the heater according to the shape of the joining surface is indispensable for efficient joining according to a common method.

[0012]

In this manner, the step of the housing body and the core are
To form one end face by fitting
Face the end face of the lid member and face each other on one plane
Welding of the lid member, the core and the end faces of the housing body
Core, housing
At the same time as joining the three parts of the
The unit is manufactured. In addition, this configuration requires a seal
Since all necessary parts are joined by welding,
There is no need to increase the number of parts such as rings,
There is no fear .

[0013]

The present invention will be described below by way of examples.

FIG. 1A shows three parts 21, 22, 23 made of Teflon-based plastic PFA (copolymer of tetrafluoroethylene and perfluoroalkoxyethylene) having a tubular structure to be joined. Furthermore, FIG.
2 is fitted to the component 23, and the joining surface 25 of the component 21 and the joining surfaces 26 and 27 of the component 22 and the component 23 are arranged to face each other. FIG. 1B shows a far-infrared heater 24 between the bonding surfaces arranged opposite to each other.
Is set, and the joining surfaces 25, 26, and 27 are heated and melted. Then, after reaching a melting state sufficient and suitable for welding, the heater is removed and the joining surfaces 25 and 26,
FIG. 1C shows a state where the welding is performed by pressing 27 (the assumed joining surface is indicated by reference numeral 28). A pipe-like structure having a partially double-pipe structure thus joined was produced.

The present invention is not limited to the above-described embodiment, but can be carried out in a similar manner, considering various types of plastics, combinations, component shapes, number of components, and shapes of joining surfaces.

FIGS. 2 to 5 show application examples in which the present invention is further embodied. This application example is applied to, for example, a filter unit used in an ultrapure water production plant or the like.

The filter unit 1 comprises a housing 2, a filter 4, and a core (built-in part) 3 which supports the filter 4 and is accommodated in the housing 2. The housing 2 and the core 3 except for at least the filter 4 are the same. It is molded with Teflon-based plastic e.g. P FA and PTFE (polytetrafluoroethylene).

The housing 2 comprises a housing body 5 for accommodating the core 3 and a lid member 6 for closing the opening 5a of the housing body 5. The housing main body 5 is provided with an inflow port 7 for introducing a filtered fluid from an end opposite to the opening 5a. Further, on the peripheral surface of the housing body 5, two discharge ports 8 and 9 are provided at every 180 ° as needed, and are used for air release and drain release. A screw 10 is formed at the inflow port 7 and each of the discharge ports 8 and 9 so as to be connectable to other devices or pipes. Further, a projection 17 for holding the core 3 is provided on the inner peripheral surface of the housing body 5.
Are formed in a plurality, for example, four, and the filter 4 around the core 3 is formed.
Is provided so as to form and hold a constant gap between the two. A step 12 is formed in the opening 5a of the housing body 5, and a flange 3a of the core 3 is fitted into the step 12 so that the core 3 can be fixed in the opening 5a. Then, the flange 3 of the core 3 is
The thickness of the flange 3a and the depth of the step 12 are provided so that the end faces of the housing main body 5 and the core 3 are aligned when a is fitted.

The cover member 6 is provided with an opening 5a of the housing body 5.
For closing the core 3 in the housing, and has a drain port 13 for discharging the filtered fluid that has passed through the filter 4. The drain port 13 is provided so as to communicate with the space 14 inside the core 3 and not directly with the space 15 inside the housing outside the core 3 without passing through the filter 4. The spaces 14 and 15 inside and outside the core 3 are communicated via a radial communication port 16 formed on the peripheral surface of the core 3 and a filter 4 wound around the core peripheral surface. Accordingly, the end 6a of the lid member 6 is formed in a flat surface so as to be in contact with and closely contact with the end 5b on the opening side of the housing body 5 and the end 3b of the core 3 fitted therein. still,
The core 3 has a cylindrical shape with one end opened, and has on its peripheral surface a large number of irregularities 17 for supporting the filter 4 in line contact, and a communication port 16 for allowing the filtered fluid to pass in the radial direction. The filter 4 is not particularly limited, and it is preferable to use a filter having a hole diameter according to the purpose of separation.

As shown in FIG. 2 , the filter unit 1 composed of the above-described components is welded with the housing body 5, the core 3, and the lid member 6 in a state where the end faces 5b, 3b, 6a abut against each other on one plane. Have been integrated. The welded joint surface is indicated by reference numeral 19. Therefore, the filtered fluid introduced from the inflow port 7 at one end of the housing 2 is introduced into the interior space 15 of the housing 2, passes through the filter 4 and the communication port 16, flows into the core 3, and is filtered. Is discharged from the drain port 13 at the other end. Also,
The gas in the housing 2 is discharged from a gas vent 8 as necessary, and the drain is discharged from a drain outlet 9 at the bottom.

The filter unit configured as described above is manufactured as follows.

First, the core 3 supporting the filter 4 is inserted into the housing main body 5 from the opening 5a of the housing main body 5, and at the opening 5a, the end face 5b of the housing main body 5 and the end face 3b of the core 3 become flush with each other. Thus, the housing body 5 and the core 3 are integrated into one part (see FIGS. 3 and 4).

Next, the housing body 5 and the lid member 6 are coaxially opposed to each other, and the end faces 5b, 3b, 6a are heated and melted. For example, the housing main body 5 is provided on one of a pair of holders (not shown) which can be freely approached / separated on the same axis,
On the other hand, the lid member 6 is mounted so that the end surfaces 5b, 3b, 6a face each other, so that the housing body 5 and the lid member 6 can be abutted by the relative movement of the holder. A panel-like far-infrared heater 18 is disposed in the middle of the heater body 5 so that the housing body 5 and the end faces 5b and 3b of the core 3 fitted thereto and the end face 6a of the lid member 6 can be welded, for example, in a transparent state. Heat at the same time until: Note that the heating means is not particularly limited to the panel-shaped far-infrared heater 18, and other heating means such as a laser may be used.

When the heating surface becomes transparent under conditions suitable for welding, for example, when it becomes transparent, the far-infrared heater 18 is taken out from between the housing body 5 and the cover member 6 and the holder is moved close to the housing body (see FIG. 4). The members 6 are butted and welded in a state of being arranged concentrically. As a result, the housing body 5, the core 3 and the lid member 6 are integrally joined at the butting surface, that is, the joining surface 19, thereby completing the filter unit 1 (see FIG. 2 ). Check the welding condition and remove the filter unit from the holder.

The filter unit 1 manufactured by the above process is made of Teflon-based plastic, and the housing body 5, the core 3 and the cover member 6 are integrated by welding, so that the filtered fluid is completely made of Teflon-based plastic. It is sealed with plastic and does not leak or contaminate.

The above embodiment is a preferred embodiment of the present invention, but the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. For example, the filter unit obtained by the method of the present invention is not particularly limited to the one shown in FIG. 1 or FIG. 2 to FIG. 5, and without providing a gas vent or a drain outlet in the housing as shown in FIG. An inlet 7 and a drain 13 for the filtered fluid may be provided, and an internal thread may be formed . In the present embodiment, a Teflon (registered trademark) type
The plastic core 3, the housing body 5 and the lid member 6
Although the example of fitting and welding has been mainly explained,
The same plastic material, that is, other similar plastic
A combination of sticks is also possible.

[0027]

As is apparent from the above description, the present invention
According to the filter unit, the housing body and core and
The lid member is made of the same plastic material and
Integrated, so that the filtration fluid is completely integrated
Sealed with plastic and will not leak or be contaminated
Never even. Moreover, this configuration requires a seal.
O-ring because all parts are joined by welding
There is no need to increase the number of parts, and there is a risk of defective sealing.
Absent. Further, according to the method for manufacturing a filter unit of the present invention,
Then, by one heat melting operation and butting,
All parts of the jing body, core and lid are joined at once
As a result, a product / filter unit can be manufactured.
Moreover, without complicating the structure of each part,
There is no increase in score.

[Brief description of the drawings]

1A and 1B are views showing an embodiment of the method of the present invention, wherein FIG. 1A shows a state in which parts before heating are divided and fitted into two groups, and FIG. 1B shows a state in which parts are heated and melted before welding. (C) shows a state immediately before removal of the heater and a state of welding and joining.

FIGS. 2A and 2B are views showing an application example in which the method of joining plastic parts according to the present invention is applied to a filter unit, wherein FIG. 2A is a vertical sectional view at the center half, and FIG. 2B is a sectional view taken along line II-II.

FIG. 3 is an exploded cross-sectional view showing components before fitting of the filter unit of FIG. 2;

FIG. 4 is an explanatory view showing a state in which a housing of the filter unit of FIG. 2 and end faces of built-in components are aligned and heated by a heater .

5 is a central longitudinal sectional view showing a state where a heated housing and a lid member of the filter unit of FIG. 2 are butt- joined .

6 is a central half-cut longitudinal sectional view illustrating another specific example of applying the bonding method of the plastic container of the present invention.

DESCRIPTION OF REFERENCE NUMERALS 1 filter unit 2 housing 3 core 3a core flange 3b core end face 4 filter 5 housing body 5a housing body opening 5b housing body end face 6 cover member 6a cover member end face 12 cover member step 14 Space inside core 15 Space around filter 19 Joint surface

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI // B29K 27:12 B29K 27:12 B29L 31:14 B29L 31:14 (56) References U) US Patent 3,508,813 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 63/00-65/82 B01D 39/00-41/04 B01D 63/10-63/12

Claims (2)

(57) [Claims] 1. A core for winding and supporting a filter.
A flow path that accommodates the core and connects to the outside around the filter
A housing body forming a space to be
Outside of the core body to close the opening in the core body and communicate with the space in the core.
And a cover member forming a flow path connected to the filter unit.
In a knit, the core, the housing body, and the lid
The members are made of the same plastic material and
Steps are formed on the end surface of the opening periphery of the ring body,
The edge of the peripheral edge of the opening of the housing main body fitted to the step portion
A flange having an end surface that is flush with the surface is attached to the core.
A step of the housing body and a flange of the core
To form one end face and
Before facing the end face of the material and facing each other on one plane
Welding of the lid member, the core and the end face of the housing body
A filter unit characterized by being more joined. 2. A core for winding and supporting a filter.
A flow path that accommodates the core and connects to the outside around the filter
A housing body forming a space to be
Outside of the core body to close the opening in the core body and communicate with the space in the core.
And a cover member forming a flow path connected to the filter unit.
In a knit, the core, the housing body, and the lid
The members are made of the same plastic material and
Steps are formed on the end surface of the opening periphery of the ring body,
The edge of the peripheral edge of the opening of the housing main body fitted to the step portion
A flange having an end surface that is flush with the surface is attached to the core.
A step of the housing body and a flange of the core
The lid member to form one end face by fitting
The core and the housing in a fitted state facing the end faces of
Heating and melting the end face of the sealing body and the end face of the lid member simultaneously
It is characterized by joining by letting it match
A method for manufacturing a filter unit.