JP2017067099A - Seal member and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal member and the like capable of firmly fixing holding plates to each other and preventing displacement of a resin seal member while having high sealability without forming a through hole in the resin seal member, in the seal member having a constitution of holding the resin seal member between two metallic holding plates.SOLUTION: In a seal member 1 configured by concentrically holding a resin seal member 2 between two metallic holding plates 3, 3', a projecting portion 7 of the metallic holding plate 3 is directly fitted to a recessed portion 6 of the metallic holding plate 3' without holding the resin seal member 2, and the two metallic holding plates 3, 3' and the resin seal member 2 are integrated in a state where the resin seal member 2 is sandwiched between a projecting portion 5 of the metallic holding plate 3 and a recessed portion 4 of the metallic holding plate 3'.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seal member used for a pump for conveying a gas or a liquid or a compressor using a gas as a compressed gas. In particular, the present invention relates to a seal member composed of a resin seal member and a metal holding plate, and a method for manufacturing the seal member.

  Conventionally, in a flow meter, a compressor, a damper mechanism, a pump, etc., in order to improve the sealing performance between a cylinder and a piston main body that reciprocates in the cylinder, a sealing member having an extended portion larger in diameter than the piston main body is used. The provided piston is known.

  Patent document 1 is proposed as a sealing member provided in such a piston. FIG. 7 shows a sealing member of Patent Document 1. FIG. 7 is a front view of this sealing member, a cross-sectional view along AA, and an enlarged view of part B. As shown in FIG. 7, the seal member 21 has a configuration in which a resin seal member 22 is concentrically sandwiched between a pair of metal holding plates 23. The convex portion 23a of one metal holding plate 23 is fitted into the concave portion 23b of the other metal holding plate 23 while penetrating the resin seal member 22, so that the pair of metal holding plates 23 and the resin are fitted. The sealing member 22 is integrated.

  This sealing member 21 is caused by using an adhesive such as sticking between adhesives or deterioration of performance because the metal holding plate 23 and the resin sealing member 22 are fixed by caulking instead of using an adhesive. Does not cause problems. Further, at the time of attachment, a counterpart material (separate member) for sandwiching the resin seal member 22 is not required. Furthermore, since the metal holding plate is used, it is excellent in mechanical strength and can be prevented from being broken by the tightening torque.

JP 2014-70712 A

  In this seal member, the pair of holding plates can be fixed by caulking and fixing the convex portions and concave portions of the metal holding plate. However, in the case of the structure in which the resin sealing member is penetrated by the crimping portion as shown in FIG. 7, there is a possibility that liquid or gas leaks from the through hole of the resin sealing member depending on the use conditions and applications. There is a risk that it cannot be secured. Moreover, although the structure which makes the convex part height of a crimping part etc. small and does not form a through-hole in resin-made sealing members is also considered, there exists a possibility that fixation of holding plates may become inadequate.

  The present invention has been made to cope with such a problem. In a sealing member having a resin sealing member sandwiched between two metal holding plates, a through hole is formed in the resin sealing member. An object of the present invention is to provide a seal member that can firmly fix the holding plates and prevent positional deviation of the resin seal member while maintaining high sealing performance without being formed, and a manufacturing method thereof.

  The seal member of the present invention is a seal member in which a resin seal member is concentrically sandwiched between two metal holding plates, and the two metal holding plates and the resin seal member are substantially It is disc-shaped, and the outer dimensions of the resin sealing member are larger than the outer dimensions of the two metal holding plates, and each of the two metal holding plates has a plurality on one plate surface. The convex portion of the other plate has the same number of concave portions as the convex portion on the surface of the other plate, and the concave and convex portion formed by a combination of the convex portion on the one metal holding plate and the concave portion on the other metal holding plate. Of these, at least one set of the concavo-convex portions, the convex portions are directly fitted into the concave portions without sandwiching the resin sealing member, and among the concavo-convex portions, the sets other than the direct fitting In the concavo-convex portion, the two metal holding plates and the resin sealing member are integrated in a state where the resin sealing member is sandwiched between the convex portion and the concave portion. To do.

  The two metal holding plates have the same shape as each other.

  Among the concavo-convex portions, in the concavo-convex portions other than the directly fitted portions, the concave portion depth is shallower than the thickness of the resin seal member, and the convex portion height is greater than the thickness of the resin seal member. Is also low.

  The method for producing a seal member of the present invention includes disposing the resin seal member between the two metal holding plates and setting the press member in a state where the resin seal member is stacked in three layers. By pressing using a mold that can be formed, the convex portion and the concave portion are formed, and at the same time, at least one set of the concave and convex portions, the convex portion is in the concave portion and the resin sealing member. The resin sealing member is sandwiched between the convex portion and the concave portion of the concave / convex portion other than the direct fitting portion of the concave / convex portion. In the state, the two metal holding plates and the resin sealing member are integrated.

  In the sealing member of the present invention, each of the two metal holding plates has a plurality of convex portions on one plate surface, and the same number of concave portions as the convex portions on the other plate surface. Among the concavo-convex portions formed by the combination of the convex portion in the metal plate and the concave portion in the other metal holding plate, at least one set of the concavo-convex portions, the convex portion is directly fitted without sandwiching the resin seal member in the concave portion. The two metal holding plates and the resin sealing member are integrated with each other in a state where the resin sealing member is sandwiched between the convex portion and the concave portion in the concave and convex portions of the set other than those directly fitted. It has become. That is, in the sealing member of the present invention, the metal holding plates are caulked and fixed by a direct fitting portion (uneven portion) provided at a position where they do not interfere with (not sandwich) the resin sealing member. The holding plates can be firmly fixed without forming a through hole in the member. Since the resin seal member has a structure that does not have a through hole, high sealing performance can be maintained and leakage of liquid and gas can be suppressed.

  In addition, since the resin seal member is sandwiched between the convex and concave portions of the concavo-convex portion other than the direct fitting portion, the resin seal member is prevented from being displaced during installation or use. it can.

  A resin sealing member is concentrically sandwiched between two metal holding plates, each having a substantially disc shape, and the outer diameter of the resin sealing member is the outer diameter of the two metal holding plates. Therefore, the extending portion (outer peripheral end) of the resin seal member has a uniform width. Furthermore, as described above, since the positional deviation of the resin seal member can be prevented by the uneven portions other than the direct fitting portion, the extending portion can be maintained at a uniform width, and the sealing performance can be prevented from being lowered.

 Since the two metal holding plates are parts having the same shape, the parts can be shared.

  In the concavo-convex part other than the direct fitting part of the metal holding plate, the concave part depth is shallower than the thickness of the resin seal member, and the convex part height is lower than the thickness of the resin seal member. It is possible to prevent the member from having a hole when the resin seal member is sandwiched.

  The sealing member manufacturing method of the present invention is a mold in which a resin sealing member is disposed between two metal holding plates, set in a press die in a state of being stacked in three layers, and can form the convex and concave portions. The convex portion and the concave portion are formed by pressing at the same time, and at the same time, at least one set of the concave and convex portions, the convex portion directly does not sandwich the resin seal member in the concave portion. Two metal holding plates and a resin seal in a state where the resin seal member is sandwiched between the convex portion and the concave portion in the set of concave and convex portions other than the fitting and the direct fitting Since the members are integrated, the holding plates can be firmly fixed without forming a through hole in the resin seal member. Moreover, the sealing member which can prevent the position shift etc. of the resin-made sealing member at the time of attachment or use without using an adhesive agent is obtained.

It is a front view etc. which show an example of the sealing member of this invention. It is a figure which shows only the metal holding plates in FIG. It is a figure which shows only the resin-made sealing members in FIG. It is a front view etc. which show the other example of the sealing member of this invention. It is the schematic of the apparatus used for the sealing performance test. It is a graph which shows the result of a sealing performance test. It is a front view etc. which show an example of the conventional sealing member.

  An example of the seal member of the present invention will be described with reference to FIGS. FIG. 1 is a front view, a cross-sectional view taken along the line AA, and an enlarged view of a portion B of the seal member. 2 is a front view of only the metal holding plate of the seal member of FIG. 1, a cross-sectional view taken along the line AA, and an enlarged view of the B portion. 3 is a front view and a sectional view of only the resin seal member of the seal member of FIG. As shown in FIG. 1, the seal member 1 of the present invention includes a resin seal member 2, a metal holding plate 3, and a metal holding plate 3 '. The resin seal member 2 is sandwiched between two metal holding plates 3, 3 '. The two metal holding plates 3, 3 'are preferably parts having the same shape from the viewpoint of production efficiency. The resin sealing member 2 and the metal holding plates 3, 3 ′ have a hollow disk shape (washer shape) arranged concentrically. The outer peripheral end portion of the resin seal member 2 is an extending portion extending from the outer periphery of the metal holding plate 3, 3 ′. The extension portion seals between the piston and the cylinder while elastically deforming following the reciprocating motion of the piston.

  Each metal holding plate has a plurality of convex portions (5, 7) on one plate surface and the same number of concave portions (4, 6) as the convex portion on the other plate surface. Here, the concavo-convex portion formed by the combination of the convex portion in one metal holding plate and the concave portion in the other metal holding plate is a direct fitting type concavo-convex portion, without sandwiching the resin seal member 2 It is the part that is directly fitted. This direct fitting uneven portion serves as a portion for fixing (preventing disengagement) between the metal holding plates. Moreover, the uneven part which consists of the recessed part 4 in one metal holding plate which is an uneven part other than these, and the convex part 5 in the other metal holding plate is a non-direct fitting uneven part. The resin sealing member 2 is sandwiched between the convex portion and the concave portion. This non-direct fitting uneven portion serves as a portion for fixing the resin seal member to the metal holding plate side (preventing displacement). In addition, “the set of the convex portion in one metal holding plate and the concave portion in the other metal holding plate” is formed at the same position (circumferential position) in each holding plate as seen from the front view. A set of concave and convex portions.

  In the form shown in FIG. 1, the convex portion 7 of the metal holding plate 3 is directly fitted into the concave portion 6 of the metal holding plate 3 ′ without sandwiching the resin seal member 2. In the state where the resin sealing member 2 is sandwiched between the convex portion 5 of the metal holding plate 3 and the concave portion 4 of the metal holding plate 3 ′ by the fitting of the direct fitting uneven portion, Two metal holding plates 3, 3 ′ and a resin sealing member 2 are integrated. For this reason, without making a hole in the resin seal member 2, the metal holding plates can be firmly fixed to each other, and displacement of the resin seal member 2 can be prevented.

  As shown in FIG. 2, the metal holding plate 3 has a concave portion 6 and a concave portion 4 on one plate surface 3a, and a convex portion 7 and a convex portion 5 on the other plate surface 3b. The concave portion 6 and the concave portion 4 are cylindrical concave portions recessed from the plate surface 3a, and the convex portion 7 and the convex portion 5 are cylindrical convex portions protruding from the plate surface 3b. Here, the concave portion 6 and the convex portion 7 constituting the direct fitting type uneven portion are complementary shapes, and are formed at the same circumferential position on both surfaces of the disc-shaped holding plate. Similarly, the concave portion 4 and the convex portion 5 constituting the non-direct fitting type concave-convex portion have complementary shapes, and are formed at the same circumferential position on both surfaces of the disc-shaped holding plate. . Moreover, these recessed part and convex part can be simultaneously formed with a press at the time of manufacture of a holding plate, for example.

  The shape of the concave portion and the convex portion is not limited as long as the shape is complementary and can be fitted in each pair, and in the case shown in FIGS. 1 and 2, both are cylindrical. Moreover, you may change a magnitude | size and a shape for every group of an uneven | corrugated | grooved part. Here, in the non-direct fitting type concavo-convex portion (concave portion 4 and convex portion 5), the depth of the concave portion 4 is shallower than the thickness of the resin seal member, and the height of the convex portion 5 is the thickness of the resin seal member. It is preferable that it is lower than this. Thereby, when the resin seal member is sandwiched between the concave and convex portions, the amount of elastic deformation of the resin seal member at the portion is small, and it is possible to prevent the member from being perforated. On the other hand, in the direct fitting type concavo-convex portion (the concave portion 6 and the convex portion 7), the concave portion 6 and the convex portion 7 are directly fitted, so that the height of the convex portion 7 is sandwiched between the holding plates. It is necessary to make it higher than the thickness of the resin seal member.

  It is preferable to provide each recessed part and each convex part in multiple places, respectively. By providing the direct fitting type irregularities (concave part 6 and convex part 7) at a plurality of positions, the metal holding plates can be more firmly fixed, and the non-direct fitting type irregularity part (concave part 4 and convex part 5). ) At a plurality of locations can prevent the positional deviation of the resin seal member at the time of attachment or use more stably. The number of sets of concavo-convex portions is not particularly limited, but is preferably 2-6.

  In addition, the position where the direct fitting uneven portion (the concave portion 6 and the convex portion 7) is formed may be a position where the resin seal member is not sandwiched. In the case shown in FIG. 1 and FIG. 2, two are formed at equal intervals in the circumferential direction at the radially inner position of the disk (within the hollow portion range of the resin seal member). About the formation position of a non-direct fitting type uneven | corrugated | grooved part (the recessed part 4 and the convex part 5), what is necessary is just the position which can be fitted, inserting | pinching a resin-made sealing member. In the case shown in FIG. 1 and FIG. 2, four are formed at equal intervals in the circumferential direction at the radially outer position of the disc. In the case shown in FIGS. 1 and 2, the formation positions of the direct fitting uneven portion and the non-direct fitting uneven portion are shifted from each other in the circumferential position.

  Examples of the material of the metal holding plate 3 include iron, aluminum, aluminum alloy, copper, and copper alloy. By adopting these materials, it is superior in mechanical strength to the resin-made holding plate, and can be prevented from being broken by the tightening torque when mounted in the cylinder. Examples of iron include general structural carbon steel (SS400, etc.), mild steel (SPCC, SPCE, etc.), stainless steel (SUS304, SUS316, etc.), aluminum as A1100, A1050, etc., and aluminum alloys as A2017, A5052 (alumite). Including treated products), examples of copper include C1100, and examples of copper alloys include C2700 and C2801. Among these, it is preferable to use aluminum or an aluminum alloy because it is lightweight, excellent in plastic workability, and easy to form an uneven portion.

  As shown in FIG. 3, the resin sealing member 2 is a hollow disk-shaped (washer-shaped) member. The resin sealing member 2 can be obtained by any manufacturing method. For example, the compression molded material is cut, the tape-like sheet material is press punched, the sheet material is cut by a cutter, The thing cut | disconnected with the laser etc. are mentioned. In order to enable elastic deformation following the reciprocating motion of the piston, a flexible sheet material is preferable. As the physical properties of the resin material forming such a sheet material, the tensile elongation at break is 100% or more, preferably 150% or more, and the upper limit is not particularly limited, but it is 450% as a common sense value. It is. Further, the tensile strength is 5 MPa or more, preferably 10 MPa or more, and the upper limit is 45 MPa. Further, the hardness is D40 to D90, preferably D50 to D80 in Shore hardness (durometer). By using such a resin material, a sealing member having excellent sealing performance and followability can be obtained.

  Resin materials include polytetrafluoroethylene (PTFE) resin, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) resin, tetrafluoroethylene-hexafluoropropylene copolymer (FEP) resin, tetrafluoroethylene-ethylene. Fluorine resin such as copolymer (ETFE) resin, polyvinylidene fluoride, polychlorotrifluoroethylene resin, polyolefin resin such as ultra high molecular weight polyethylene (UHMWPE) resin, polyacetal (POM) resin, polyamide 6 (PA6) ) Resin, polyamide 6-12 (PA612) resin, polybutylene terephthalate resin, and the like. A rubber elastic body such as an elastomer can also be used. Among these, it is particularly preferable to use a fluororesin because the sliding properties are particularly excellent. In addition, you may mix | blend fillers, such as reinforcement fibers, such as glass fiber, and a polyimide resin powder, with these resins. Examples of commercially available fluororesins that can be used in the present invention include NTN Precision Resin's trade name: BEAREE FL3000 (fluorine resin sheet; thickness 0.5-1 mm, tensile elongation at break 200%, tensile strength 15 MPa, hard (Durometer) D66).

  Another example of the seal member of the present invention will be described with reference to FIG. FIG. 4 is a front view of this seal member, a cross-sectional view taken along line AA, and an enlarged view of part B. As shown in FIG. 4, the seal member 1 ′ in this form is the same as that shown in FIG. 1 except that the shape of the metal holding plate is different. The resin sealing member 2 is sandwiched between the two metal holding plates 8 and 8 ′ with the outer peripheral ends extending. Each metal holding plate has a plurality of convex portions (10, 12) on one plate surface and the same number of concave portions (9, 11) as the convex portions on the other plate surface. Here, the concavo-convex portion formed by a set of the convex portion 12 in one metal holding plate and the concave portion 11 in the other metal holding plate is a direct fitting type concavo-convex portion. Further, the concavo-convex portion formed by the combination of the convex portion 10 in one metal holding plate and the concave portion 9 in the other metal holding plate, which is a concavo-convex portion other than these, is a non-direct fitting type concavo-convex portion. .

  In the embodiment shown in FIG. 4, the convex portion 12 at the center of the metal holding plate 8 is directly fitted into the concave portion 11 at the center of the metal holding plate 8 ′ without sandwiching the resin seal member 2. . In the state where the resin sealing member 2 is sandwiched between the convex portion 10 of the metal holding plate 8 and the concave portion 9 of the metal holding plate 8 ′ by the fitting of the direct fitting type uneven portion, The two metal holding plates 8 and 8 'and the resin sealing member 2 are integrated.

  It is preferable to set the outer dimension of the convex part 12 at the center part of the holding plate, which constitutes the direct fitting type uneven part, to be the same as the inner diameter dimension of the hollow disk of the resin sealing member 2. By setting in this way, the convex portion 12 can be arranged in a state of passing through the hollow portion of the resin seal member 2 without a gap, and centering during manufacture is easy. Further, the coaxiality between the outer diameter of the resin seal member and the inner diameter of the metal holding plate can be made highly accurate. Furthermore, the displacement of the resin sealing member 2 can be further prevented in combination with the non-direct fitting type concave and convex portions (the concave portion 9 and the convex portion 10).

  The outer dimension of the convex portion 12 may be smaller than the inner diameter dimension of the hollow disc of the resin sealing member 2. Even in this case, it is possible to prevent the displacement of the resin seal member 2 by the non-direct fitting uneven portions (the concave portion 9 and the convex portion 10).

  The manufacturing method of the sealing member of this invention is demonstrated. The manufacturing method mainly includes (1) a method of manufacturing a metal holding plate having each concavo-convex portion separately, and using this, and (2) a metal holding plate and a resin sealing member. In the integration, there is a method of manufacturing while forming an uneven portion at the same time.

  In the case of (1), arrange the two metal holding plates having each concavo-convex part so that each convex part in one metal holding plate overlaps the corresponding concave part in the other metal holding plate, A resin seal member is disposed between the holding plates, and is set in a press die in a state of being stacked in three layers. By pressing thereafter, the direct fitting type irregularities are directly fitted without sandwiching the resin seal member, and the non-direct fitting type irregularities are resin between the convex part and the concave part. The metal seal plate is sandwiched between the two metal holding plates and the resin seal member.

  In the case of (2), a resin seal member is arranged between two metal holding plates, set in a press mold in a state of being stacked in three layers, and a mold (pins etc.) that can form each convex part and each concave part ) To press. Thereby, each convex part and each concave part are formed, and at the same time, the direct fitting type uneven part is directly fitted without sandwiching the resin seal member, and the non-direct fitting type uneven part is provided with the convex part. The resin seal member is sandwiched between the portion and the recess, and the two metal holding plates and the resin seal member are integrated.

  Even if the manufacturing method in any case is adopted, the holding plates can be firmly fixed to each other without forming a through hole in the resin seal member by an easy manufacturing process. In particular, in the case of (2), positioning of the concavo-convex portion is not necessary, and it becomes possible to manufacture more easily. In addition, since the two metal holding plates that sandwich the resin seal member are parts having the same shape, they can be fixed without considering the front and back of the resin seal member, are easy to manufacture, and reduce the manufacturing cost. be able to.

[Examples and Comparative Examples]
The sealing performance of the sealing member having the shape shown in FIG. 1 was evaluated by conducting a sealing performance test. The sealing member of the present invention having the shape of FIG. 1 was used as an example, and the sealing member having the shape of FIG. 7 was used as a comparative example. The metal holding plate was made of stainless steel, and the resin sealing member was made of a fluororesin sheet material. The sealability test is performed in the test apparatus shown in FIG. 5 by installing the seal member 1 and flowing compressed air from the IN side of the schematic diagram, and discharging air leaking from the contact portion between the seal member and the housing from the OUT side. The amount (cc) was measured. More specifically, by increasing the pressure of compressed air from the IN side (air pressure) from 0.05 MPa to 0.05 MPa, and collecting the air discharged from the test apparatus with a measuring cylinder submerged in a water tank. The amount of leakage was measured. In addition, the O-ring 13 was attached inside the housing to ensure the hermeticity of the housing.

  The results of this sealability test are shown in FIG. In FIG. 6, the horizontal axis represents the pressure of compressed air (air pressure (MPa)), and the vertical axis represents the amount of air discharged from the test apparatus (leakage amount (cc)).

  As shown in FIG. 6, in this measurement range, the sealing member of the present invention with leakage countermeasures has a smaller amount of air exhausted from the test apparatus than the conventional sealing member without leakage countermeasures, It was confirmed that the sealing performance was improved by the countermeasures.

  The sealing member of the present invention is a sealing member having a structure in which a resin sealing member is sandwiched between two metal holding plates while maintaining a high sealing performance without forming a through hole in the resin sealing member. Since the holding plates can be firmly fixed to each other and the positional deviation of the resin seal member does not occur, it can be suitably used for fluid sealing devices such as pneumatic devices, hydraulic devices, and hydraulic devices.

1 Seal member 2 Resin seal member
3, 8 Metal holding plate 4, 6, 9, 11 Concave part 5, 7, 10, 12 Convex part 13 O-ring

Claims (4)

A sealing member in which a resin sealing member is concentrically sandwiched between two metal holding plates,
The two metal holding plates and the resin sealing member have a substantially disc shape, and the outer dimensions of the resin sealing member are larger than the outer dimensions of the two metal holding plates,
Each of the two metal holding plates has a plurality of convex portions on one plate surface, and the same number of concave portions as the convex portions on the other plate surface,
Of the concavo-convex portions formed of a set of the convex portion in one of the metal holding plates and the concave portion in the other metal holding plate, at least one set of the concavo-convex portions, the convex portion is formed in the concave portion. It is fitted directly without sandwiching the seal member,
Among the concavo-convex portions, in the concavo-convex portions of the set other than the directly fitted portions, the two metal holding plates, with the resin sealing member sandwiched between the convex portions and the concave portions, A sealing member, wherein the resin sealing member is integrated.   The sealing member according to claim 1, wherein the two metal holding plates have the same shape.   Among the concavo-convex portions, in the concavo-convex portions of the set other than the directly fitted portions, the concave portion depth is shallower than the thickness of the resin seal member, and the convex portion height is greater than the thickness of the resin seal member. The sealing member according to claim 1 or 2, wherein the sealing member is also low. It is a manufacturing method of the sealing member according to any one of claims 1 to 3,
By placing the resin sealing member between the two metal holding plates, setting it in a press mold in a state of being stacked in three layers, and pressing using a mold that can form the convex part and the concave part ,
At the same time that the convex portion and the concave portion are formed,
Of the concavo-convex portions, in at least one set of concavo-convex portions, the convex portions are directly fitted without sandwiching the resin seal member in the concave portions, and among the concavo-convex portions other than the direct fitting The two metal holding plates and the resin sealing member are integrated in a state where the resin sealing member is sandwiched between the convex portion and the concave portion. The manufacturing method of the sealing member characterized.