JPH1122826A - Gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket which can generate a high sealing precision using a reaction force while the structure remains simple and includes no liquid sump to allow prevention of bacteria, etc., from propagation to lead to establishment of good sanitation. SOLUTION: A gasket 1 is equipped with a ring body having a hole 2 in the center and a joining surface 3 on each surface, an annular groove 5 formed at the peripheral wall surface 4 of the ring body, tight contacting piece 5 formed on the joining surfaces 3 through the groove 5, and a ridge 7 formed on that side of the contacting piece 6 where the joining surface 3 exists. The depth of the groove 5 should range between 2-15 mm, preferably between 3-10 mm, depending upon the material of the ring body, shape of the part 6, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket for sealing and preventing leakage of a fluid from inside a machine or a device, and intrusion of fluid or dust from the outside.

[0002]

2. Description of the Related Art Conventionally, the following gaskets have been used as gaskets for sealing and preventing leakage of fluid from the inside and intrusion of fluid and dust from the outside at connection parts and sealing parts of machines and devices. Widely used. a, an O-ring for providing a mounting groove on one of the contact surfaces such as a connecting portion or a sealing portion of a machine or a device, and mounting the connecting portion or the sealing portion etc. in a slightly crushed state beforehand to seal the connecting portion or the sealing portion. b. A packing used for sealing a connection portion or a sealing portion between contacting surfaces of a connection portion or a sealing portion of a machine or a device and for applying a pressure higher than an O-ring. c, A liquid gasket that fills a concave portion of a contact surface such as a connection portion or a sealing portion of a machine or a device and bonds both surfaces of the connection portion or the sealing portion. In addition, O and O in connection parts and sealing parts of machines and devices, etc.
The following is disclosed as a sealing structure using a packing such as a ring or a gasket or other gaskets. d. A combination of two flanged knife edges and one flanged knife disclosed in Japanese Utility Model Application Laid-Open No. 60-58958 (hereinafter referred to as "A"), and a gasket is provided between the flanges. Vacuum sealing structure with a wedge effect between knife edges by inserting and compressing. e, a plurality of projections for pressing against the inner wall surface of a concave hole formed in the end face of the flange joint are formed at a plurality of positions on the peripheral edge of the metal gasket disclosed in Japanese Utility Model Application Laid-Open No. 61-109980 (hereinafter referred to as "B"). Metal gasket for vacuum seal. f, a pressure supporting element sealing device disclosed in Japanese Patent Publication No. 6-505788 (hereinafter referred to as "C" publication) in which the gap on the downstream side of the O-ring is substantially eliminated. g, the amount of screwing between the female screw portion of the push ring and the male screw portion of the first tube, disclosed in Japanese Utility Model Laid-Open Publication No. 8-1500 (hereinafter referred to as Japanese Patent Publication No. A pipe connection structure that is regulated by abutting against the regulation surface. h, a configuration disclosed in Japanese Patent Application Laid-Open No. 9-60731 (hereinafter referred to as “E”), in which the number of empty winding portions of the hoop material is increased to 5 and that of the hoop material, or the welding fixing portion of the hoop material is circular. A spiral gasket having a structure provided at four locations where the circumference is divided at equal intervals.

[0003]

However, the above-mentioned conventional gasket and seal structure have the following problems. When an O-ring is used, if the fluid pressure becomes higher than a specified value, the O-ring protrudes into a gap such as a contact surface and is broken, so that the O-ring lacks durability and lacks sealing reliability. In addition, since the O-ring is used by being fitted into a groove formed in a sealing portion or the like, a liquid pool is formed in the groove in which the O-ring is fitted, and it is easy for bacteria and the like to propagate in the groove and the O-ring. Chip. In addition, the O-ring must be replaced with a new O-ring every time the O-ring is deteriorated or the device is disassembled and reassembled, and the durability and convenience are lacking. When packing is used, it is necessary to repeat the diagonal tightening and repeat the tightening work to an appropriate tightening torque when sandwiching the packing in the connection part or sealing part of the machine or equipment, and the mounting workability and workability Lack. In addition, during the diagonal tightening operation, one-sided tightening of the packing that locally compresses abnormally easily occurs, and the mounting operation is complicated. In addition, when the packing is installed, the packing is likely to be over-compressed, which leads to accelerated deterioration of the packing, damage to the packing in the form of a thread, and lacks the durability and sealing reliability of the packing. It requires replacement with a new packing every time it is disassembled and assembled, and lacks durability and convenience. Also, when used for sanitary use, the mounting part of the packing cannot be mounted flush with the inner surface of the pipe, so that liquid or slurry in the fluid accumulates at that part, bacteria easily proliferate and lack hygiene, and the packing corrodes. Easy and lacks durability. Further, in the conventional connection of pipes using an O-ring or gasket, since liquid pools are formed at the connection portions, various bacteria easily grow in the pipes and lack hygiene, and the inside of the pipes is difficult to clean and maintenance is poor. Since the liquid gasket has a weak sealing force, the application is limited to an application having a small force to break the sealed state, and lacks sealing reliability and convenience. In the vacuum seal structure described in Japanese Patent Application Publication No. H06-27139 and the metal gasket for vacuum seal application described in Japanese Patent Application Publication No. H02-27, when a gasket is inserted between two flanges and compressed, diagonal tightening is repeated to increase to an appropriate tightening torque. It is necessary to repeat the tightening work, and workability and workability are lacking. In addition, when the gasket is twisted when the gasket is attached, the sealing accuracy is reduced,
Requires accuracy on both sides of the flange that sandwiches the gasket,
Sealing accuracy is affected by the accuracy of both sides of the flange, and the reliability of sealing is lacking. Further, in the vacuum seal structure described in Japanese Patent Application Laid-Open Publication No. H11-15095, a liquid pool is formed between the gasket and the knife edge, and germs and the like are easily propagated and lack hygiene. Furthermore, the conventional metal gasket lacks familiarity after mounting and lacks sealing reliability when sealing a gas body.
In the sealing device for the pressure support element described in the publication No. C and the pipe connection structure described in the publication No. D, sealing is performed using an O-ring or packing, so that the fluid pressure and the operating temperature of the O-ring and packing are higher than specified. If the temperature rises too high, the O-ring and the packing will be damaged, so that the use environment is limited and the sealing reliability is lacking. In addition, the structure of the connecting member, the pipe, and the like is complicated and lacks productivity. In addition, liquid pools are formed at the O-ring arrangement portion and the like, and bacteria and the like are easily propagated and lack hygiene. In addition, new O-rings and packings are used every time the old O-ring and packing are disassembled and disassembled and reassembled.
Requires rings and packing, lacks durability and convenience. The spiral gasket described in Japanese Patent Application Laid-Open Publication No. H11-27095 has a complicated structure, is difficult to be mounted at a predetermined position, and lacks mounting workability. In addition, it is necessary to repeat diagonal tightening at the time of mounting work to increase the tightening torque to an appropriate tightening torque, and thus the workability and workability are lacking. Further, when the gasket is twisted when the gasket is mounted, the sealing accuracy is reduced.

[0004] The present invention solves the above-mentioned conventional problems. With a simple structure, it is possible to obtain high sealing accuracy by utilizing a reaction force, and also to prevent accumulation of liquid germs and other germs, An object is to provide a gasket excellent in hygiene.

[0005]

To solve the above-mentioned conventional problems, the gasket of the present invention has the following configuration. The gasket according to claim 1 of the present invention has an annular body having a hole at the center and a joining surface on both sides, one or more annular grooves formed on an outer peripheral wall surface of the annular body, A close contact piece formed on at least one of the joining surfaces via a groove, and one or more ridges formed on the joining surface side of the close contact piece; It has a configuration. Thus, similarly to the conventional gasket, the ridges are simply arranged at predetermined positions on the connection surface and the sealing surface of the connection portion and the sealing portion of the machine and the device to connect and seal the machine and the device, etc. The contact portion is brought into contact with the connection surface or the sealing surface, and the close contact portion elastically deforms and bends. Due to the reaction force of the elastically deformed close contact portion, the convex portion can be tightly sealed to the connection surface, the sealing surface, and the like. It has the action of: Further, since the annular groove is formed on the outer peripheral wall surface of the annular body, the peripheral wall surface of the hole can be closely connected to the connecting portion or the sealing portion, and the liquid pool at the connecting portion or the sealing portion where the gasket is arranged can be reduced. It has the effect that it can be prevented. In addition, since the connecting portion and the sealing portion are sealed by utilizing the reaction force of the close contacting portion, the gasket can be used repeatedly rather than disposable as in the related art. Here, as the shape of the hole or the annular body, a circle, an ellipse, a polygon such as a triangle or a quadrangle or the like is used depending on the application. Ring material is malleable cast iron, carbon steel,
Metal materials such as alloy steel, stainless steel, aluminum, brass, copper, etc., hard vinyl chloride, polyethylene and polyamide,
Synthetic resins such as polyester and polysulfone are used, and are appropriately selected according to the usage of the gasket. Further, it is desirable that the annular groove is formed with a width larger than the amount of elastic deformation of one or both close contact pieces. The depth of the annular groove is appropriately determined according to the material of the annular body, the shape of the close contact piece, and the number of the annular grooves. As the cross-sectional shape of the ridge, a semi-circular shape is preferably used, but any shape such as a triangular shape or a square shape may be used. The height of the ridge is appropriately determined according to the material of the annular body, the shape and size of the close contact piece, and the width and depth of the annular groove. Also, when the protruding ridge is formed at the outer peripheral edge of the close contact piece, the close contact piece is easily elastically deformed,
The close contact piece can be elastically deformed with a small force.

[0006] The gasket according to claim 2 of the present invention comprises:
An annular body having a hole in the center and having joint surfaces on both surfaces, one or more annular grooves formed on the outer peripheral wall surface of the annular body,
At least one of the joining surfaces has a close contact piece formed so that an outer peripheral edge protrudes outside of the joining surface via the annular groove.
As a result, as in the case of the conventional gasket, a close contact is achieved by merely arranging at a predetermined position such as a connection surface or a sealing surface of a connection portion of a machine or a device or a sealing portion to connect or seal a machine or device or the like. Because the outer peripheral edge of one part is in contact with the connection surface, sealing surface, etc.
The close contact piece is elastically deformed and bent, and the reaction force of the elastically deformed close contact piece can bring the close contact piece into close contact with a connection surface, a sealing surface, or the like, thereby sealing the close contact piece. In addition, since the close contact piece portion is formed on the outer peripheral wall surface of the annular body, the peripheral wall surface of the hole can be closely connected to the connection portion, the sealing portion, and the like. Has the effect of preventing liquid pooling. In addition, since the connecting portion and the sealing portion are sealed by the reaction force of the close contact piece portion, the connecting portion and the sealing portion can be used repeatedly rather than disposable as in the related art. Here, as the close contact piece, it is sufficient that the outer peripheral edge of the close contact piece protrudes in the vertical direction outside the bonding surface, and the close contact piece is moved toward the outer peripheral edge. It may be formed thick or thin, or may be formed to a uniform thickness. Further, the angle between the close contact piece and the bottom of the annular groove is appropriately determined according to the material of the annular body, the connecting portion that comes into contact with the close contact piece, and the sealing portion. Alternatively, the joint between the close contact piece and the bottom of the annular groove may be formed with a radius. The buckling of the close contact piece can be prevented.

[0007] The gasket according to the third aspect is the first aspect.
Alternatively, in the invention described in Item 2, the annular groove has a configuration in which an opening side is formed to be wider than a bottom side. Since the base of the close contact piece is formed thicker than the hole side, the mechanical strength can be increased as compared with the case where the close contact piece has a uniform thickness. It has the action of: In addition, since the bending stress of the close contact piece can be dispersed by the thickness of the base, the durability can be improved.

[0008] The gasket according to claim 4 of the present invention comprises:
The invention according to claim 2 or 3 has a configuration provided with one or a plurality of ridges formed on the bonding surface side of the close contact piece. As a result, the contact between the close contact portion and the connecting surface or the sealing surface of the connecting portion or the sealing portion of the machine or the device can be formed by the convex ridge portion, and the effect of obtaining high sealing accuracy can be obtained. Have. Instead of forming the ridge, the outer peripheral edge of the close contact piece may be chamfered or rounded to make contact with the connection surface, the sealing surface, or the like. The contact with the connection surface and the sealing surface is improved, and the sealing performance can be improved.

[0009] The gasket according to claim 5 of the present invention comprises:
5. The invention according to claim 1, wherein one of the close contact pieces extends from the outer peripheral wall to the outer peripheral side of the annular body from the joint surface. 6. have. As a result, the close contact piece extending from the joining surface from the outer peripheral wall surface to the outer peripheral side is also elastically deformed and bent in the axial direction, and is closely contacted with the connection surface and the like by the reaction force of the elastically deformed close contact piece. Since the pieces can be tightly sealed, the gasket has an effect that it can be used for connection and sealing of pipes having different pipe diameters. Here, the intersection angle between the outer peripheral wall surface of the annular body and the close contact piece portion is appropriately determined according to the material of the connection portion or the sealing portion that contacts the annular body or the close contact piece portion. Further, the joint between the outer peripheral wall surface of the annular body and the close contact piece may be formed with a radius. The buckling of the close contact piece can be prevented.

[0010] The gasket according to claim 6 of the present invention comprises:
The invention according to any one of claims 1 to 5, wherein a height of a plurality of ridges formed on the close contact piece is lower on the hole side and further away from the hole side. It has a high configuration. Thereby, each of the ridge portions can be brought into contact with the connection surface, the sealing surface, or the like, and has an effect of improving the sealing performance.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 A gasket according to Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 (a)
1 is an overall perspective view of a gasket according to Embodiment 1, and FIG. 1B is a cross-sectional view of a main part of the gasket according to Embodiment 1. In FIG. 1, reference numeral 1 denotes an annular gasket according to the first embodiment used for sanitary piping in a food production factory or a pharmaceutical factory, etc., 2 denotes a hole formed in the center of the gasket 1, and 3 denotes both sides of the gasket 1. 4 is an outer peripheral wall surface of the gasket 1, 5 is an annular groove formed along the outer peripheral wall surface 4, 6 is a close contact piece formed on both joint surfaces 3 via the annular groove 5, 7 is It is a ridge that is formed concentrically around the hole 2 on the outer peripheral edge side of the close contact piece 6. The depth of the annular groove 5 is appropriately determined to be 2 mm to 15 mm, preferably 3 mm to 10 mm, depending on the material of the annular body, the shape of the close contact piece 6, and the like. As the depth of the annular groove 5 becomes smaller than 3 mm, depending on the material of the annular body, the amount of deflection is small, and it tends to be difficult to obtain a strong reaction force. There was a tendency that productivity was lacking due to difficulty. Further, the opening width of the annular groove 5 was formed to be larger than both bending amounts of the both close contact pieces 6 formed on both the joining surfaces 3 of the gasket 1. Thereby, while the joining part of two flange pipes can be firmly sealed, one-sided tightening can be prevented. The height of the ridge 7 is 0.1 mm to 1.5 mm, preferably 0.15 mm to 0.8 mm, depending on the material of the annular body and the shape and size of the close contact piece 6. Is determined as appropriate.
The height of the ridge 7 depends on the material of the gasket 1 and the like. However, as the height becomes lower than 0.15 mm, the amount of deflection is small and a strong reaction force tends to be hardly obtained. Is larger than 0.8 mm, the amount of flexure becomes too large, and metal fatigue tends to accumulate at the base of the close contact piece 6 and the mechanical strength tends to deteriorate.

Next, a gasket according to an application of the first embodiment will be described with reference to the drawings. FIG. 2 is a cross-sectional view of a main part of a gasket according to an application example of the first embodiment.
In FIG. 2, reference numeral 1 ′ denotes a gasket of the application example of the first embodiment, and 5 a denotes a bottom 5 b formed into a curved surface and an opening side formed by a bottom 5.
b, the annular groove 5c is formed to be wider than the annular groove 5a.
The annular groove wall surfaces, 7a and 7b are ridges formed so as to surround the hole 2 in the same manner as the ridges 7, and α is the opening angle of the annular groove 5a. The bottom portion 5b may be formed in a U-shape as shown in FIG. 1 or may be formed by providing a rounded shape as shown in FIG. When the gasket 1 ′ is mounted between the flange connection surfaces and pressed against each other, it is formed in a round shape so that the elasticity can be increased and the reaction force of the close contact piece 6 can be strengthened. The occurrence of localized metal fatigue can be prevented. The annular groove wall surfaces 5c may be formed in parallel with each other, or may be formed in an expanded shape at an expansion angle α. The reaction force at the bottom 5b can be strengthened. The spread angle α is formed in the range of 0.1 ° to 30 °, preferably 0.6 ° to 10 °. As the expansion angle α becomes smaller than 0.6 °, machining becomes more difficult, and depending on the depth of the annular groove 5a and the mechanical strength of the material, a large force is required for elastic deformation of the close contact piece 6. In addition, as the spread angle α becomes larger than 10 °, the thickness of the close contact piece 6 on the side of the hole 2 becomes thinner, and the mechanical strength tends to decrease. Alternatively, if the angle exceeds 30 °, this tendency is recognized, so that it is limited by the material and the like and lacks universality. The diameters of the ridges 7, 7a, 7b may be the same or different.
The height may be the same, but it is preferable that the protruding ridge 7 outside the hole 2 is formed higher than the protruding ridges 7a and 7b. The height of the ridges 7a, 7b is preferably such that when the close contact piece 6 is bent, the joint surface 3 of the gasket 1 'is in close contact with the flange connection surface. This is to completely prevent the high-pressure fluid from leaking from the flange connection surface. When the diameter of the gasket 1 ′ is large, three or more ridges 7 may be formed on one surface of the close contact piece 6.

Next, a usage state of the gasket according to the first embodiment will be described with reference to the drawings. FIG. 3 is a cross-sectional perspective view of a main part showing a usage state of the gasket according to the first embodiment. In FIG. 3, reference numerals 8, 8 'denote flange pipes of a pipe of a food production plant, and 9, 9' denote flange pipes 8, 9;
The flanges 8 ', 9a, 9'a are the flange connection surfaces of the flanges 9, 9' opposed via the gasket 1, 10, 1
Reference numeral 0 'denotes a pipe of a flange pipe 8, 8' through which a liquid such as water or oil or a pressure fluid such as steam, gas, or air flows, and 11 denotes a bolt for connecting the flanges 9, 9 'via a gasket 1. , 12 are nuts of the bolt 11. The tube 10,
When a gasket having the same inner diameter of 10 'and the diameter of the hole 2 is used, the peripheral wall of the hole 2 of the gasket 1 can be connected to the inner diameter of the pipes 10, 10' at the same level. The operation of the gasket 1 according to the first embodiment configured as described above will be described below. Flange pipe 8,
The gasket 1 is disposed between the flange connection surfaces 9a and 9'a of the flange 8 ', and the flanges 9 and 9' are tightened by bolts 11 and nuts 12 to connect the flange pipes 8 and 8 '. As the flanges 9, 9 'are tightened with the bolts 11 and the nuts 12,
The close contact piece 6 of the gasket 1 bends, and the ridge 7 comes into close contact with the flange connection surfaces 9a and 9'a by the reaction force of the close contact piece 6. The joint surfaces 3 and 3 of the gasket 1 are flange connection surfaces 9
After tightening the bolt 11 with the nut 12 until the bolts 11a and 9'a are in close contact with each other, a fluid such as a gas, a liquid, or a slurry flows through the pipes 10 and 10 '. When the pressure in the piping system is reduced, as the pressure between the flange connection surfaces 9a and 9'a is reduced, the contact portions 6 close together.
Is drawn toward the flange connection surfaces 9a and 9'a, and the pressure of the atmosphere is transmitted to the annular groove 5. Therefore, the ridge 7 is connected to the flange by the reaction force of the close contact piece 6, the degree of vacuum, and the pressure of the atmosphere. The flange connection surfaces 9a, 9'a are completely sealed by being strongly pressed against the surfaces 9a, 9'a.

Next, sealing performance was evaluated using the gasket of the first embodiment. The results will be described below. (Experimental Example) FIG. 4 is a schematic diagram showing an evaluation test of the sealing performance. 1 and 3 are denoted by the same reference numerals and description thereof is omitted. In the figure, 13 is a blind flange, 14
Is a flange having a hole 14a formed substantially in the center, 15 is a vacuum pump, 16 is a pipe communicating the vacuum pump 15 with the hole 14a of the flange 14, and 17 is a pressure gauge connected to the pipe 16. As a test gasket, the height of the ridge 7 from the joint surface 3 is 0.2 mm, and the curvature of the ridge 7 is 2
As shown in FIG. 4, the gasket 1 having a thickness of 2 mm, a thickness of the close contact piece 6 of 2 mm, a width of the annular groove 5 of 1.0 mm, and a thickness of 5 mm between the two joining surfaces 3 is blinded. The blind flange 13 and the flange 14 were arranged between the flanges 13 and 14 and fastened with four bolts 11 and nuts 12. The vacuum pump 15 was held at a reduced pressure of 100 Torr through a pipe 16 for 10 minutes. As a result, the blind flange 13,
No leakage between the flange 14 and the gasket was observed. After the disassembly and reassembly were performed, a test was performed in the same manner. As a result, even after the disassembly and reassembly were performed five times, no leakage was observed from the connection surface.

Next, the relationship between the pressure of the pressure fluid and the reaction force of the close contact piece 6 will be described with reference to the drawings. FIG. 5 is a diagram showing the relationship between the pressure of the pressure fluid and the contact reaction force of the close contact piece. In the figure, the horizontal axis indicates the pressure of the pressure fluid, and the vertical axis indicates the contact reaction force of the close contact piece 6. As shown in FIG. 5, when the pressure of the pressure fluid is 0 atg, when the gasket 1 is mounted between the blind flange 13 and the flange 14, the close contact piece 6 is deformed due to the elastic deformation of the close contact piece 6. Only the force acts as a close contact force of the close contact piece 6. When the pressure of the pressurized fluid is reduced to reduce the pressure between the blind flange 13 and the flange 14, atmospheric pressure is applied to the annular groove wall surface of the annular groove 5, and the pressure applied to the annular groove 5 is changed to the close contact piece 6. The pressure is higher than the pressure applied between the blind flange 13 and the flange 14, and the close contact piece 6 is further pressed against the blind flange 13 and the flange 14, and the ridge 7 is pressed against the flange connection surface. In addition, when the pressure between the blind flanges 13 and 14 increases, when the pressure exceeds a certain pressure, the pressure applied to the annular groove 5 becomes lower than the pressure applied between the close contact pieces 6 and the blind flanges 13 and 14. It was found that the contact reaction force of the close contact piece 6 was reduced.

As described above, the gasket according to the first embodiment has the following functions. By arranging the gasket between the connection surfaces of the opposed flange tubes and fastening the flange with bolts and nuts, an axial force is applied to the protruding ridges of the gasket so that the close contact piece is axially moved. Since the elastically deformed and deformable flexure can be bent, the reaction force of the elastically deformed close contact piece can firmly and closely contact the ridge with the connection surface of the flange, thereby sealing the flange connection surface. Further, since the annular groove is formed on the outer peripheral wall surface of the annular body, the peripheral wall surface of the hole of the gasket can be closely connected to the flange connection surface, and the liquid pool at the connection portion where the gasket is arranged can be prevented. It has the effect of being able to. Further, when the inner diameter of the pipe body and the diameter of the hole of the gasket are the same, the peripheral wall of the hole of the gasket and the inner peripheral wall of the flange tube can be closely connected, and the gasket can be closely connected. This has the effect of preventing liquid accumulation at the connection portion where is disposed, and of facilitating cleaning of the inside of the tube. Further, when the pressure in the pipe is reduced, the reaction force of the close contact piece is increased, and therefore, there is an effect that particularly tight sealing can be achieved in the case of vacuum or reduced pressure piping. Also,
Utilizing the reaction force of the closely contacting piece, the ridge and the closely contacting piece are brought into close contact with the connection surface and sealed, eliminating the need to replace the gasket every time the pipe is disassembled and reassembled. Has the effect that the same gasket can be used repeatedly. In addition, since the close contact piece can be elastically deformed in the axial direction, the ridge portion can flexibly and closely contact the flange connection surface according to the shape of the flange connection surface. In addition, even when vibration is applied to the flange, the close contact piece can follow the vibration and always contact the convex portion with the connection surface by the reaction force of the close contact piece. This has the effect of preventing loosening of the bolts connecting the pipes. The opening of the annular groove at the opening side of the outer peripheral wall surface is made wider than the bottom of the annular groove to provide a widening angle, so that the mechanical strength of the bottom of the annular groove can be prevented from deteriorating. Forming a plurality of ridges on each joint surface and forming the ridges lower as the distance from the hole side increases has an effect of further increasing the sealing degree.

Embodiment 2 A gasket according to Embodiment 2 of the present invention will be described below with reference to the drawings. FIG. 6 is a sectional view of a main part of a gasket according to the second embodiment. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the figure, reference numeral 18 denotes a ring-shaped gasket according to the second embodiment which is used for a piping or a high-pressure concrete pump of a food production factory or a chemical factory,
4a is a central portion having the same outer diameter as the outer peripheral wall surface 4;
Reference numerals 9a and 19b denote central portions 4 on the outer peripheral wall 4 of the gasket 18.
It is an annular groove formed through a. The annular groove 19
The widths of the a and 19b are formed to be larger than the amount of deflection of one of the close contact pieces 6, and the depth of the annular grooves 19a and 19b is determined by the material of the gasket 18 and the connection surface that contacts the gasket 18 and the close contact. It depends on the amount of bending of the contact piece 6, etc.
Each of the annular grooves 19a and 19b may have a different depth and width. As described above, the gasket according to the second embodiment is configured, and in addition to the operation of the first embodiment,
It has the following effects. Since two annular grooves are formed, the width and depth of the annular grooves can be changed according to each close contact piece, so that even when different materials are connected via the gasket. In addition, there is an effect that the amount of elastic deformation and the reaction force of the close contact piece can be adjusted in accordance with the material of the connection surface such as a flange contacting the close contact piece, and the sealing can be performed.
Also, there is an effect that the spacer can be used also at the time of connection in a case where the connection surface is wide. Since the close contact piece is formed through the central portion, only the bending stress of one close contact piece is applied to each bottom, so that the opening width of the annular groove can be reduced and the mechanical strength can be improved. Have.

(Embodiment 3) A gasket according to Embodiment 3 of the present invention will be described below with reference to the drawings. FIG. 7 is a cross-sectional view of a main part of a gasket according to Embodiment 3 of the present invention. In the figure, reference numeral 20 denotes an annular gasket according to the third embodiment used for piping in a food production factory or a pharmaceutical factory, etc., reference numeral 21 denotes a hole formed in the center of the gasket 20, reference numeral 22 denotes a joint surface on both surfaces of the gasket 20, 23 is an outer peripheral wall surface of the gasket 20, 24 is an annular groove formed in the outer peripheral wall 23, 25 is a joint surface 22 through the annular groove 24,
A close contact piece portion 25a whose outer peripheral edge protrudes from the joint surface 22 is a close contact surface of the close contact piece portion 25 and 26a.
Is a ridge formed in a convex shape on the outer peripheral edge of the close contact piece 25, and β is the intersection angle between the close contact surface 25a of the close contact piece 25 and the joint surface 22. β is formed between 179.5 ° and 170 °. In addition, instead of forming the ridge 26,
The outer peripheral edge of the close contact piece 25 may be inclined outward at a predetermined inclination angle from the joint surface 22 to project outward, and the end may be chamfered or rounded. Close contact piece 2
5 and the contact surface with which it comes into contact can be improved.

Since the gasket according to the third embodiment is configured as described above, it has the following operations. Since the outer peripheral edge of the close contact portion of the gasket protrudes from the joint surface, the close contact portion is axially moved only by arranging the gasket between the flange connection surfaces and fastening the opposed flanges. The gasket and the flange connection surface can be sealed by the elastically deformed and bent contact portion, and the convex portion can be firmly and closely contacted with the flange connection surface by the reaction force of the elastically deformed close contact piece portion. Further, since the annular groove is formed on the outer peripheral wall surface of the annular body, the peripheral wall surface of the hole portion of the gasket and the inner peripheral wall surface of the pipe body such as a flange pipe can be closely connected in a flush manner, and the gasket is disposed. This has the effect of preventing liquid pools such as liquids and slurries at the connected portions and improving safety. In addition, since the protruding ridges and the closely contacting pieces are brought into close contact with the connection surface by utilizing the reaction force of the closely contacting pieces, the gasket needs to be replaced every time the pipe is disassembled and reassembled. Instead, the same gasket can be used repeatedly. In addition, since the close contact piece can be elastically deformed in the axial direction, the ridge portion can flexibly and closely contact the flange connection surface according to the shape of the flange connection surface. In addition, even when vibration is applied to the flange, the close contact piece can follow the vibration and always contact the convex portion with the connection surface by the reaction force of the close contact piece. This has the effect of preventing loosening of the bolts connecting the pipes.

(Embodiment 4) A gasket according to Embodiment 4 of the present invention will be described below with reference to the drawings. FIG. 8 is a cross-sectional view of a main part showing a usage state of the gasket according to the fourth embodiment, and FIGS. 9A and 9B are cross-sectional end views of a main part on the outer peripheral wall side of the gasket according to the fourth embodiment. Note that the same components as those in Embodiments 1 to 3 are denoted by the same reference numerals, and description thereof is omitted. In the figure, reference numeral 27 denotes a flange pipe which is connected to the flange pipe 8 and has a larger diameter than the flange pipe 8, reference numeral 28 denotes a flange of the flange pipe 27, and reference numeral 28a denotes a flange 2 opposed to the flange connection surface 8a of the flange pipe 8.
Reference numeral 8 denotes a flange connection surface, 29 denotes a pipe of the flange pipe 27, 3
0 is a flange connection surface 9a, 28a of the flange pipe 8, 27.
The annular gasket according to the fourth embodiment, which is arranged between the gasket 30 and the hole 31 formed in the center of the gasket 30,
2a and 32b are bonding surfaces on both surfaces of the gasket 30, 33 is an outer peripheral wall surface of the gasket 30, 34 is an annular groove formed on the outer peripheral wall 33, and 35 is a bonding surface 32b via the annular groove 34.
, A protruding close contact piece extending from the outer peripheral wall surface 33 to the outer peripheral side from the bonding surface 32a, and a close contact contact portion 35, a protruding close contact piece. Part 36
A convex ridge formed in a convex shape on the joining surfaces 32b, 32a side of
γ is the angle of intersection between the outer peripheral wall surface 33 and the protruding close contact piece 36. The intersection angle γ is appropriately determined according to the material of the gasket 30 and the flange connection surfaces 9a and 28a. In FIG. 9, (a) shows that the protruding close contact piece 36 is connected to the joining surface 32.
than a are formed to be inclined outwardly, is formed slightly larger than the crossing angle gamma ₁ is 90 ° to protrude closely contact piece portion 36 and the circumferential wall 33 with its end portion 37a is formed at an acute angle. Thereby, a strong reaction force can be obtained. (B)
The outer peripheral wall surface 33 is formed in a round shape. As a result, the base of the protruding close contact piece 36 is formed widely, so that buckling of the protruding close contact piece 36 can be prevented, and metal fatigue due to disturbance in the flow velocity of the high-pressure fluid or the like is reduced. be able to.

Since the gasket according to the fourth embodiment is configured as described above, it has the following operation in addition to the operation of the first to third embodiments. Since one of the close contact pieces extends from the joint surface to the outer peripheral side of the outer peripheral wall surface of the gasket, even in the case of connection of pipes having different pipe diameters, the gasket can reliably seal with the close contact pieces. In addition, the close contact piece can be elastically deformed in the axial direction even when the close contact piece extends from the joining surface to the outer peripheral side of the outer peripheral wall surface of the gasket, and the elastically deformed close contact piece can be elastically deformed. It has the effect of being able to seal with the connection surface by the reaction force of the part. Also, since each close contact piece can be elastically deformed in the axial direction, the ridge formed on the joint surface side of the close contact piece can flexibly conform to the shape of the flange connection face of each flange pipe. Correspondingly, the flange can be in close contact with the flange connection surface, and even when vibration or the like is applied to the flange tube, the contact portion can follow the vibration and the ridge can always be in close contact with the flange connection surface of the flange tube. This has the effect of preventing the bolts connected to the flange tube by self-locking from loosening.

Embodiment 5 A gasket according to Embodiment 5 of the present invention will be described below with reference to the drawings. FIG. 10 is a cross-sectional view of a main part showing a use state in which the gasket according to Embodiment 5 is used for a blind plate, a cap, or the like of a sanitary device or the like in a food production factory or the like. still,
The same components as those in Embodiments 1 to 4 are denoted by the same reference numerals, and description thereof is omitted. In the figure, reference numeral 38 denotes a sanitary device through which a liquid such as water or oil flows or a fluid such as steam, gas, or air, 38a denotes a sealing surface of the device 38, and 39 denotes a sealing surface 38a.
, A reference numeral 40 denotes an annular gasket according to the fifth embodiment disposed on the upper surface of the packing 39, and reference numeral 41 denotes a hole formed in the center of the gasket 40.
2a is the joint surface on the side of the close contact piece, 42b is the gasket 4
No. 0, a flat sealing surface on the sealing surface side, reference numeral 43 denotes an outer peripheral wall surface of the gasket 40, reference numeral 44 denotes an annular groove formed in the outer peripheral wall surface 43, and reference numeral 45 denotes one of the bonding surfaces 4 via the annular groove 44.
The close contact piece portion 46 formed in 2a is the close contact piece portion 4.
5, a convex ridge portion formed in a convex shape on the outer peripheral edge side, 47 is disposed on the joint surface 42a side of the gasket 40, and is a plate such as a blind plate fastened to the device 38 with the bolt 11, 47a is a plate 47 sealing surface. As shown in FIG. 10, the gasket 40 according to the fifth embodiment configured as described above is arranged such that the joint surface 42b is in contact with the packing 39 arranged on the sealing surface 38a of the device 38, and the joint surface 42a The sealing surface 47 a of the plate 47 is brought into contact with the plate 47, and the plate 47 is fastened to the device 38 with the bolt 11 to seal the device 38.

Since the gasket according to the fifth embodiment is configured as described above, the joint surface of the gasket, which does not have a close contact piece, is disposed on a sealing surface of a device or the like via packing. By contacting the sealing surface of the plate, such as a blind plate, with the joining surface on the side of the close contact piece, the plate is fastened to the device or the like, so that the close contact piece elastically deforms and bends, and the elastically deformed close contact The convex portion is pressed against the sealing surface of the plate by the reaction force of the abutting piece, and the device can be sealed. Further, since the fluid does not flow through the packing mounting portion, there is an effect that the liquid or slurry is prevented from accumulating in the packing mounting portion and sealing can be performed. In addition, since the close contact piece formed on the joint surface can flexibly respond to the sealing surface of the plate, even when vibration is applied to the plate, the close contact piece can follow the vibration, The ridge portion can always be in close contact with the sealing surface, and has an effect of preventing loosening of the bolt to which the plate is fastened by so-called self-locking.

[0024]

As described above, according to the gasket of the present invention, the following excellent effects can be realized. According to the first aspect of the present invention, (1) Similar to a conventional gasket, close contact only by arranging it at a predetermined position on a connecting surface of a machine or a device, a connecting surface of a sealing portion, a sealing surface, or the like. The protruding ridges and the close contact pieces formed on the one piece abut against the connection surface and the sealing surface, and the close contact pieces elastically deform in the axial direction and bend. By the force, the ridges and the close contact pieces can be securely pressed against the connection surface, the sealing surface, and the like, and the sealing can be performed with a simple structure, and the sealing reliability is excellent. (2) Since the protruding ridges and the like are brought into close contact with the connecting surface and the sealing surface by utilizing the reaction force of the close contacting piece, the device is renewed every time the device is disassembled and reassembled. There is no need to replace the gasket, you can use the same gasket repeatedly,
Excellent durability and convenience. (3) Since the annular groove is formed on the outer peripheral wall surface of the gasket, the peripheral wall surface of the hole of the gasket and the inner peripheral wall surface of the pipe can be tightly connected flush with each other. It is suitable for connecting and sealing sanitary piping and equipment in food production factories and chemical factories, etc., and is excellent in hygiene and cleaning inside piping. It is easy to perform, the maintenance property in the piping is improved, and the sanitation is more excellent. (4) Since the annular groove is formed in the outer peripheral wall surface of the gasket, as the pressure inside the gasket is reduced or reduced, the reaction force of the close contact portion increases. Especially excellent in sealing accuracy. (5) Since the close contact piece can be elastically deformed in the axial direction, it can flexibly cope with the shape of the connection surface or the sealing surface such as the connection portion of the machine or the device or the sealing portion, and the connection portion or the sealing portion. It has excellent responsiveness and followability of the close contact piece to the contact surface, and does not require high precision on the connection surface and sealing surface, and is excellent in workability. (6) Since the close contact piece can be elastically deformed in the axial direction, the close contact piece always follows the vibration even when vibration is applied to the connection portion or the sealing portion of a machine or a device, and the protrusion is always convex. The part can be in close contact with the connecting surface and the sealing surface, and the bolt that fastens the connecting part and the sealing part always receives a reaction force, preventing the tightening force of the bolt from dropping by so-called self-locking, maintaining high sealing accuracy, and sealing. Excellent reliability. According to the second aspect of the invention, in addition to the effect of the first aspect, (7) since the close contact piece is formed on the outer peripheral wall surface of the annular body, the peripheral wall surface of the hole portion is connected to the connecting portion or sealed. Parts and the like can be closely connected, and the sealing property can be improved. (8) Since it has a simple structure, it is excellent in mass productivity and can be produced at low cost. According to the third aspect of the present invention, in addition to the effects of the first or second aspect, (9) the base of the close contact piece is formed thicker than the hole side, so that the close contact piece is formed. The mechanical strength can be increased as compared with the case where the portion is formed with a uniform thickness. (10) Since the hole side is inclined, it is possible to enlarge the pressing area of the fluid and obtain a high degree of sealing. (11) Since the bending stress of the close contact piece can be dispersed by the thickness of the base, the durability can be improved. According to the fourth aspect of the present invention, in addition to the effects of the second and third aspects, (12) the contact between the close contact piece and the connecting surface or the sealing surface of the connecting portion or the sealing portion of the machine or the device. Can be obtained by the ridges, and high sealing accuracy can be obtained. According to the fifth aspect of the invention, in addition to the effects of the first to fourth aspects, (13) it can be used for connection of pipes having different pipe diameters, etc., so that it is excellent in convenience and the close contact piece portion has an outer periphery. Even when extending from the joint surface to the outer peripheral side from the wall surface, the contact portion can be sealed by the reaction force of the elastically deformed close contact portion by elastically deforming and bending the close contact portion in the axial direction, Excellent sealing performance. Claim 6
According to the invention described in (1), in addition to the effects of the first to fifth aspects, (14) all the ridges can be brought into contact with the connection surface, the sealing surface, and the like, and the sealing performance can be improved.

[Brief description of the drawings]

FIG. 1A is an overall perspective view of a gasket according to a first embodiment. FIG. 1B is a sectional view of a main part of the gasket according to the first embodiment.

FIG. 2 is a sectional view of a main part of a gasket in an application example of the first embodiment.

FIG. 3 is a cross-sectional perspective view of a main part showing a use state of the gasket according to the first embodiment.

FIG. 4 is a schematic diagram showing an evaluation test of sealing performance.

FIG. 5 is a diagram showing the relationship between the pressure of the pressure fluid and the contact reaction force of the close contact piece.

FIG. 6 is a sectional view of a main part of a gasket according to the second embodiment.

FIG. 7 is a sectional view of a main part of a gasket according to a third embodiment.

FIG. 8 is a sectional view of a main part showing a use state of a gasket according to a fourth embodiment.

9A is a cross-sectional end view of a main part of an outer peripheral wall side of a gasket according to a fourth embodiment. FIG. 9B is a cross-sectional end view of a main part of an outer peripheral wall side of a gasket according to a fourth embodiment.

FIG. 10 is a sectional view of a main part showing a use state in which the gasket according to the fifth embodiment is used for a blind plate, a cap, or the like of a sanitary device or the like in a food production factory or the like.

[Explanation of symbols]

 1, 1 'gasket 2 hole portion 3 joining surface 4 outer peripheral wall surface 4a central portion 5, 5a annular groove 5b bottom portion 5c annular groove wall surface 6 close contact portion 7, 7, a, 7b convex streak portion 8, 8' flange tube 9, 9 'Flange 9a, 9'a Flange connection surface 10, 10' Pipe 11 Bolt 12 Nut 13 Blind flange 14 Flange 14a Hole 15 Vacuum pump 16 Pipe 17 Pressure gauge 18 Gasket 19a, 19b Annular groove 20 Gasket 21 Hole 22 Joining surface 23 Outer wall surface 24 Annular groove 25 Close contact piece 25a Close contact surface 26 Convex ridge 27 Flange tube 28 Flange 28a Flange connection surface 29 Tube 30 Gasket 31 Hole 32a, 32b Joint surface 33 Outer wall surface 34 Ring Groove 35 Close contact piece 36 Projecting close contact piece 37 Convex ridge 37a End 38 Device 3 a sealing surface 39 the packing 40 gasket 41 holes 42a, 42b bonding surface 43 outer peripheral wall 44 an annular groove 45 closely contact piece portion 46 protruding strip portion 47 plates 47a sealing surface α widening angle β intersection angle γ angle of intersection

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masato Nakawa 3-12-2 Maigaoka, Kokuraminami-ku, Kitakyushu-shi, Fukuoka

Claims (6)

[Claims] 1. An annular body having a hole at the center and having a joining surface on both sides, one or more annular grooves formed on the outer peripheral wall surface of the annular body, and the joining surface via the annular groove. A gasket, comprising: a close contact piece formed on at least one of the above; and one or more ridges formed on the bonding surface side of the close contact piece. 2. An annular body having a hole at the center and having joint surfaces on both sides, one or more annular grooves formed on the outer peripheral wall surface of the annular body, and the joining surface via the annular groove. A gasket, comprising at least one of: a close contact piece formed by projecting an outer peripheral edge outward beyond the joint surface. 3. The annular groove is formed so that an opening side is wider than a bottom side.
The gasket described in the above. 4. The gasket according to claim 2, further comprising one or a plurality of ridges formed on the joint surface side of the close contact piece. 5. The method according to claim 1, wherein one of the close contact pieces extends from the outer peripheral wall to an outer peripheral side of the annular body from the joint surface. A gasket according to any one of the preceding claims. 6. The height of a plurality of protruding ridges formed on the close contact portion is lower on the hole side and higher as the distance from the hole side increases. 1
The gasket according to any one of Items 1 to 5, wherein