JP5273380B2 - Fastening structure and filtration device - Google Patents

Description

  The present invention relates to a fastening part structure and a filtration device provided with the fastening part structure.

  As one of fastening parts used for assembling machines and the like, a combination of a nut which is a female screw member and a bolt which is a male screw member is widely used.

Such a fastening part composed of a nut and a bolt may loosen the nut due to vibration or the like while using a machine or the like.
In order to prevent the nut from loosening, a spring washer and a toothed washer are used in combination, or a double nut is used, and fixing through a lock wire is generally performed. Innumerable techniques for preventing such a nut from loosening are also disclosed (for example, see Patent Documents 1 and 2).

By the way, for example, in order to reliably remove a relatively small amount of foreign matter in a liquid, a filtration device in which a filter member that is disposed horizontally is accommodated in a casing may be used.
The filter member has, for example, a configuration in which a filter paper tube (filter tube) is externally fitted to a cylindrical member having countless holes on the side surface.
The liquid to be treated that may contain foreign matter flows into the space defined between the casing of the filtration device and the filter member, and the foreign matter is removed by the filter paper tube of the filter member. Liquid) flows out from the filtration device via the internal space of the filter member, and is stored in a container or the like.

In this case, for example, the filtrate outflow side which is one end side of the filter member is fixed to the casing, and the other end side of the filter member is disposed inside the casing as a so-called free end (free end). In the method of fixing the other end of the filter member to the casing, it is necessary to adopt a fastening structure of the filter member and the casing in consideration of the expansion allowance due to the heat of the filter member, but in the floating end method, the expansion allowance of the filter member is considered. There is no need to do.
The loose end of the filter member is connected to the end face of the cap nut by fastening a bolt-like portion having a male screw formed on the outer periphery of the tip of the tubular member and a cap nut, for example, via a flange provided at one end of the filter member. The end face of the flange is in close contact. The use of a cap nut as a nut is intended to prevent danger that may occur when the tip of the bolt-shaped part is exposed from the nut, and in particular, the liquid to be treated containing foreign matter from the gap between the nut and the bolt-shaped part. This is to prevent direct flow into the filter member.

At this time, if looseness is caused in the fastening structure of the free end of the filter member, the object to be treated containing foreign matter from the gap generated between the end face of the flange and the end face of the cap nut through the gap between the flange and the bolt-shaped portion. There is a possibility that the liquid flows directly into the filter member and mixes with the filtrate, and foreign matter may be mixed in the filtrate stored in the container or the like.
For this reason, the fastening structure of the filtration device is required to ensure that the end face of the flange and the end face of the cap nut are in close contact with each other more than the general fastening structure used in the above-described machine or the like.

JP 2008-298218 A JP 2009-058030 A

  The problem to be solved is that the flange end face and the bag are formed in a fastening part structure that is constituted by a bolt member and a cap nut member and fastened via a flange fixed to a member different from the bolt member or the cap nut member. It is difficult to substantially maintain the tight contact state of the end face of the nut.

The fastening portion structure according to the present invention includes a male screw member having a male screw portion at a tip portion, and an end portion opposite to the tip portion being fixed so as not to be displaceable, a head portion, and a projecting portion on the head portion. A bag female screw member having a female screw part in which a female screw is formed, a plate member fixed so as not to be displaced and having an opening, and a spacer member having an opening,
The male screw member, the plate material, the spacer member and the bag female screw member are arranged in this order,
The male screw member and the female female screw member are inserted and fastened through the opening of the plate member and the opening of the spacer member, and the space between the female screw member and the spacer member is sealed by a seal structure, and the spacer member The plate material is fixed by a fixing mechanism.

  Moreover, the fastening part structure according to the present invention is preferably characterized in that the fixing mechanism is a compression member disposed by engaging both ends of the bag female screw member and the spacer member.

  The fastening portion structure according to the present invention is preferably characterized in that the elastic member is a coil spring.

Further, the filtration device according to the present invention comprises a filter member accommodated in a casing, and the liquid to be treated flows into a space defined between the filter member and the casing, and passes through the filter member. The filtrate to be filtered is configured to flow out of the filtration device via the internal space of the filter member,
The filter member includes a cylindrical member having an infinite number of openings on the side surface, and a filter that is provided with flanges at both ends and is fitted on the cylindrical member, and one end side of the filter member is fixed to the casing. The other end side of the filter member is disposed inside the casing as a floating end,
In the filtration device in which the distal end portion on the floating end side of the cylindrical member is formed in a male screw shape and is fastened to the female screw member via a flange on the other end side of the filter member.
The cylindrical member is a male screw member, the flange on the other end side of the filter member is a plate member having an opening, and has the above-described fastening portion structure.

  In the filtration device according to the present invention, preferably, the bag female screw member is configured by a head that is a split component that can be assembled and disassembled and a female screw portion that is externally fitted on the head, and the filter device is assembled. Wherein at least three pin members are provided on the side surface of the head, one end of which is inserted through the head to fix the head and the female screw portion and the other end abuts against the inner surface of the casing. To do.

  In the fastening portion structure and the filtering device according to the present invention, the space between the female screw member into which the spacer member is inserted and the spacer member is sealed by the seal structure, and the spacer member and the plate material are fixed by the fixing mechanism. Even if the member expands, the positive contact state between the plate member and the female screw member is substantially maintained.

FIG. 1 is a diagram for explaining a process including a filtration device. FIG. 2 is an external view of the cylindrical member. FIG. 3 is an external view of the filter. FIG. 4 is an external view of a filter member obtained by attaching a filter to a cylindrical member. FIG. 5 is an exploded perspective view of the filter member filter including the fastening portion structure. FIG. 6 is a partial cross-sectional view of a filter member including a fastening portion structure. FIG. 7 is an exploded cross-sectional view of a bag female screw member for explaining a fastening part structure according to a modification. FIG. 8 is an assembly exploded sectional view of a bag female screw member including a spacer member, for explaining a fastening part structure according to a modification. FIG. 9 is a cross-sectional view of a fastening part structure according to a modification.

  An embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to the drawings, taking a filtering device having a fastening portion structure as an example.

The filtration device according to the present embodiment, for example, removes foreign substances that may be contained in the production process in polyurethane resin produced in a production kettle or its raw materials (hereinafter collectively referred to as liquids to be treated). It is for removing.
As shown schematically in FIG. 1, for example, the liquid to be processed that is reacted and generated in the manufacturing pot 10 at a temperature of, for example, several hundreds of degrees Celsius is maintained at a temperature of, for example, about 100 ° C. After being cooled and fed into, for example, a horizontal filtration device 12 to remove foreign matter, it is accommodated in a container 14 such as a drum can. The container 14 is sent to the next processing step or shipped as an intermediate product or a final product.

The filtration device 12 includes a filter member (inner cylinder) 16 and a casing (outer cylinder) 18 in which the filter member 16 is accommodated.
The liquid to be treated flows into a space defined by the filter member 16 and the casing 18 (indicated by an arrow A1 in FIG. 1), and the filtrate that has passed through the filter of the filter member 16 is inside the filter member 16. It flows out of the filtration device 12 via a space (indicated by an arrow A2 in FIG. 1).

The filter member 16 includes a cylindrical member (post) 20 and a filter (filter cylinder) 22.
The cylindrical member 20 shown in FIG. 2 is hollow (not shown), and has a myriad of holes (openings) 26 that are formed in a side surface, for example, in a staggered manner and communicate with the internal space. Instead of the hole 26, an opening having an appropriate shape such as a slit may be formed. The cylindrical member 20 has a distal end portion 30 on one end side formed in a male screw shape (male screw portion), and a flange 28 provided on the other end side.
The filter 22 shown in FIG. 3 includes a corrugated tubular filter paper 23 having a wave front line in the longitudinal direction and flanges (end caps) 32 a and 32 b provided at both ends of the filter paper 23. When the filter 22 is long, a plurality of short filter portions can be joined and used.
The filter member 16 shown in FIG. 4 is obtained by externally fitting the filter 22 to the cylindrical member 20 from the tip portion 30 side, bringing the flange 32b into contact with the flange 28, and exposing the tip portion 30 from the flange 32a. .
The filter member 16 has a filtrate outflow side (indicated by an arrow X1 in FIG. 1) fixed to the casing 18, and the other end side (indicated by an arrow X2 in FIG. 1) is a free end (free end). As shown in FIG.

By the way, in the conventional filtration apparatus used by the present inventors, the end surface of the tubular member 20 is fastened to the flange 32a by using a fastening portion structure that fastens the distal end portion 30 of the tubular member 20 and the cap nut via the flange 32a. The filtration device was used in a state of being fixed to the end face of the filter.
However, when a liquid to be treated was treated with a filtration device using a filter paper having a filter pore size of 10 μm (filter paper eyes), there was a problem that very fine foreign matters were mixed into the filtrate (treatment liquid clarified liquid). .
The present inventors diligently studied the following measures.
That is, first, the filter pore diameter was changed to 1 μm, but it was not possible to completely eliminate the contamination of foreign matters into the filtrate.
Next, after treating the liquid to be treated at a temperature of 120 ° C. for 6 hours, the filter member was extracted from the casing and the condition of the fastening portion was confirmed. As a result, the end face of the cap nut floated about 2 mm from the end face of the flange 32a ( Separated). As a result, there is a possibility that the liquid to be treated containing foreign matter may directly leak into the tubular member 20 from the gap between the flange 32a and the tubular member 20 through the gap between the flange 32a and the tubular member 20. I found out.
The float on the end face of the cap nut was assumed to be due to the looseness of the cap nut. One of the causes of loosening of the cap nut is considered to be insufficient tightening force of the cap nut, so we tried to increase the cap nut tightening force more than usual, but the bag of the fastening part after filtering for 6 hours The condition of the nut floating was not improved.
Further, for example, in order to confirm whether the cap nut is loosened by rotating by the vibration received during operation of the filter device, after filtering for 6 hours in a state where both the cap nut and the flange 32a are marked. As a result of confirming the fastening state, it was found that there was no misalignment between the markings of the two, and the lifting of the cap nut was not caused by the cap nut rotating due to vibration or the like and being loosened.
Then, it came to mind that the cylindrical member 20 having a total length of about 1000 mm might be caused by thermal expansion during the filtration process. SUS304, which is a material of the cylindrical member 20, has a linear expansion coefficient of 17.3 × 10 ⁻⁶ / ° C., and it has been found that when it is heated from room temperature to, for example, 120 ° C., it is 1.7 mm in calculation. On the other hand, the interval at which the end face of the cap nut floats from the end face of the flange 26a confirmed previously is about 2 mm, and it was found that the two coincide substantially.
The fastening portion structure according to the present embodiment is obtained based on this finding.

In the filtration device according to the present embodiment, the filter member 16 in which the distal end portion 30 of the cylindrical member 20 is exposed from the flange 32a is formed by the fastening portion structure according to the present embodiment shown in FIGS. In some cases, it is sealed in a liquid-tight state.
The filter member 16 uses a cylindrical member 20 as a male screw member having a fastening portion structure, and a flange 32a on the other end side of the filter member 16 as a plate having an opening having a fastening portion structure.

  As already described, in the state in which the filter member 16 shown in FIG. 1 is attached to the casing 18, the end of the filter member 16 opposite to the distal end portion (male thread portion) 30 of the tubular member 20 is the flange 28. It is fixed to the casing 18 by an appropriate fastening structure. As a result, the end of the cylindrical member 20 opposite to the tip 30 is fixed to the casing 18 so that it cannot be displaced. On the other hand, it can be said that the flange 32a is fixed to the body portion of the filter 22 and further to the casing 18 so as not to be displaced.

The fastening part structure according to the present embodiment is configured as follows.
The fastening portion structure includes an annular spacer member 34, a compression member 36, and a bag female screw member 38 that are joined to a flange 32 a where the tip (male screw portion) 30 of the cylindrical member (male screw member) 20 is exposed. Have.
The spacer member 34 is provided with a flange 34b joined to the flange 32a at the end of the cylindrical body 34a. The length of the spacer member 34 is set to a dimension sufficiently larger than the displacement amount of the tip portion 30 due to thermal expansion described later. An O-ring 44 is provided inside the spacer member 34. The spacer member 34 may be provided thick and the flange 34b may be omitted.
The elastic member 36 is a coil spring.
The bag female screw member 38 includes a head portion 40a and a female screw portion 40b that protrudes from the head portion 40a and has a smaller diameter than the head portion 40a and has a female screw formed on the inner surface.
Each component of the fastening portion structure is arranged in the order of the tubular member 20, the flange 32a, the spacer member 34, and the bag female screw member 38. The spacer member 34 is externally fitted to the distal end portion 30 of the tubular member 20 with an appropriate seal member 42 interposed between the flange 32a and the flange 34b. The female female screw member 38 is inserted into the spacer member 34 with a female screw part 32b fitted with an elastic member 36 having one end engaged with the head 40a, and the female screw part 40b and the tip of the cylindrical member 20 are inserted. Part 30 is fastened. At this time, the other end of the elastic member 36 engages with the end surface of the spacer member 34 opposite to the side where the flange 34b is provided. As a result, the spacer member 34 is urged to the flange 32 a by the elastic member 36, and the spacer member 34, strictly speaking, the flange 34 b of the spacer member 34 and the flange 32 a of the filter member 16 are brought into close contact with each other via the seal member 42.

  In the filtration device including the fastening portion structure according to the above-described embodiment, when the tubular member 20 of the filter member 16 incorporated in the filtration device extends in the left direction in FIG. 6 due to thermal expansion, the tubular member. The female screw member 38 engaged with 20 also moves in the left direction in FIG. At this time, since the spacer member 34 is urged by the elastic member 36 and is in close contact with the flange 32a via the seal member 42, a gap is generated between the spacer member 34 and the flange 32a. There is no possibility that the processing liquid directly enters the inside of the filter member 16 to contaminate the filtrate. The female screw portion 32b slides inside the spacer member 34. Since the space between the female screw portion 32b and the wall portion of the opening of the spacer member 34 is sealed by the O-ring 44, the female screw portion 32b There is no possibility that the liquid to be treated enters directly into the filter member 16 from the gap between the spacer members 34 to contaminate the filtrate. In other words, the close contact state between the bag female screw member 38 and the flange 32a is substantially maintained, and the liquid tight state of the filter member 16 is well maintained.

Here, each part of the filter member 16 can be formed of an appropriate metal material such as SUS304. The elastic member 36 may be an appropriate member such as rubber instead of the coil spring. At this time, not only the pressure member 36 but also a proper fixing mechanism, for example, a spacer member and a flange may be joined by a suitable joining method such as welding. Further, the seal between the female screw portion 32b and the wall portion of the opening of the spacer member 34 is not limited to the O-ring 44, and for example, an appropriate seal structure such as arranging a metal packing on the end surface of the spacer member 34 can be employed. . Further, the tip of the male screw member may have a male screw shape other than the bolt, and the female screw member may have a female screw shape other than the cap nut portion.
In addition, the dimension of each part of a fastening part structure can be suitably set as a design condition according to the dimension etc. of the filter etc. in this case etc. to the machine etc. to which a fastening part structure is applied.
In the present embodiment, the cylindrical member 20 has a total length of 1025 mm and a diameter of 25 mm, the tip portion 30 has a total length of 36 mm and a diameter of 25 mm, and a male with a 1.5 mm pitch in the 25 mm length range of the total length of 36 mm. A screw is formed. The spacer member 34 has a length of 21 mm, an outer diameter of 52 mm, and a maximum inner diameter of 38 mm. The bag female screw member 38 has a diameter of 25 mm, and female screws are formed at a pitch of 1.5 mm within a length of 26 mm.

  By the way, it replaces with the fastening part structure which concerns on this Embodiment, and employ | adopts the normally used loosening prevention structure as a fastening part structure, and is cylindrical with the force resisting the stress by extension of a cylindrical member (male screw member) It is also conceivable to press the member 20 and prevent the elongation. However, in this case, it is considered that there is a risk of damage such as deformation of the cylindrical member if the elongation of the long and large cylindrical member due to thermal expansion is forcibly restrained.

  The fastening portion structure according to the present embodiment is not limited to the filtration device according to the present embodiment, and is used when the male screw member and the bag female screw member are fastened and used via a plate material fixed so as not to be displaced. Even if the male screw member expands due to expansion, the present invention can be applied to an appropriate device that is required to avoid a gap between the bag female screw member and the plate.

Next, modified examples of the fastening portion structure according to the present embodiment will be described with reference to FIGS.
In the fastening portion structure according to the modified example, the bag female screw member 43 includes a head 45 and a female screw portion 46 which are divided parts that can be assembled and disassembled.
The head portion 45 has at least three or more through-hole portions 48 for fitting the pin members 49 provided on a side surface parallel to the center line and orthogonal to the center line (in FIG. 7, one through-hole portion 48). Only appears.) The female screw portion 46 has three holes 50 (only one hole 50 appears in FIG. 7) communicating with the through hole 48 in a small head 47 formed on one end side, and the other end. A flange (flange) 52 is provided on the side.
The spacer member 54 has a flange 34a and an O-ring 44, and a circumferential projection 56 that accommodates the O-ring 44 is formed on the inner surface of the end portion of the trunk portion 34a.

  The female screw portion 46 is inserted into the spacer member 54 in a state where the distal end portion 30 (not shown in FIGS. 7 and 8) of the cylindrical member 20 and the female screw portion 46 are fastened. The elastic member 36 is externally fitted to a portion of the female screw portion 46 exposed from the spacer member 54, and the head 45 is externally fitted to the small head 47 while positioning the through hole 48 and the hole 50. Finally, the pin member 49 is fitted into the through hole 48 and the hole 50 so that the small head 47 and the head 45 are integrated and fixed. Note that the female screw portion 46 is prevented from coming off from the spacer member 54 by engaging the collar portion 52 with the circumferential protrusion 56.

The fastening part structure according to the modification can achieve the operation and effect of the fastening part structure according to the present embodiment and can perform the fastening operation more easily and reliably.
In addition, if the dimension of the pin member 49 is set such that the tip of the exposed portion of the pin member 49 abuts the inner surface of the casing when the filter member is incorporated into the casing, vibrations that may occur during use of the filtration device are caused. It is also effective as a measure for preventing loosening of the fastening portion structure. In this case, when the pin member is used only for preventing the loosening of the fastening portion structure and it is not necessary to provide a part fixing function for the bag female screw member, the pin member is fastened, for example, on the outer periphery of the spacer member or the flange of the filter member. You may provide in a part position or the suitable position of the vicinity.

DESCRIPTION OF SYMBOLS 10 Manufacturing hook 12 Filtration apparatus 14 Container 16 Filter member 18 Casing 20 Cylindrical member 22 Filter 23 Filter paper 28, 32a, 32b, 34b Flange 30 Tip part 34, 54 Spacer member 34a Trunk part 36 Elastic member 38, 43 Bag female screw member 40a, 45 Head 40b, 46 Female thread 42 Seal member 44 O-ring 47 Small head 49 Pin member 52 Gutter 56 Circumferential protrusion

Claims (5)

A male screw member having a male screw portion at the tip, and an end opposite to the tip being fixed so as not to be displaceable, and a female screw portion protruding from the head and the head to form a female screw A bag female screw member having a plate member having an opening fixed so as not to be displaceable, and a spacer member having an opening,
The male screw member, the plate material, the spacer member and the bag female screw member are arranged in this order,
The male screw member and the female female screw member are inserted and fastened through the opening of the plate member and the opening of the spacer member, and the space between the female screw member and the spacer member is sealed by a seal structure, and the spacer member And a fastening portion structure in which the plate material is fixed by a fixing mechanism.   The fastening part structure according to claim 1, wherein the fixing mechanism is a pressure member disposed by engaging both ends of the bag female screw member and the spacer member.   The fastening part structure according to claim 2, wherein the elastic member is a coil spring. A filter member is accommodated in a casing, the liquid to be treated flows into a space defined between the filter member and the casing, and the filtrate filtered through the filter member Configured to flow out of the filtration device via the internal space,
The filter member includes a cylindrical member having an infinite number of openings on the side surface, and a filter that is provided with flanges at both ends and is fitted on the cylindrical member, and one end side of the filter member is fixed to the casing. The other end side of the filter member is disposed inside the casing as a floating end,
In the filtration device in which the distal end portion on the floating end side of the cylindrical member is formed in a male screw shape and is fastened to the female screw member via a flange on the other end side of the filter member.
The filtration device having the fastening part structure according to any one of claims 1 to 3, wherein the cylindrical member is a male screw member, and the flange on the other end side of the filter member is a plate member having an opening. .   The bag female screw member is constituted by a head part that is an assembling / disassembling divided part and a female screw part that is externally fitted to the head part. 5. The filtering device according to claim 4, wherein at least three pin members are provided on a side surface of the head portion, wherein the female screw portion is fixed and the other end abuts against the inner surface of the casing.

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