WO2016013682A1

WO2016013682A1 - Piping member, and connecting or sealing structure using this member

Info

Publication number: WO2016013682A1
Application number: PCT/JP2015/071281
Authority: WO
Inventors: 吉田　英樹
Original assignee: 旭有機材工業株式会社
Priority date: 2014-07-25
Filing date: 2015-07-27
Publication date: 2016-01-28

Abstract

A piping member (1, 23) having a flange structure comprising a tubular part (3, 25) inserted and fitted to the end of any pipe and a disk-shaped flange (2, 24) extending in the circumferential direction from the tubular part. A through-hole (4) in the central part of the flange communicates with the interior of the tubular part, and seal members (5) are mounted in seal member grooves (6) formed in the outer circumferential surface of the tubular part. An annular spacer (26) is arranged on the surface of the flange on the tubular-part side of the flange, and through-holes (27) for insertion of a pushing rod for pressing the spacer are provided in the flange.

Description

Piping member and connection or sealing structure using the member

The present invention relates to a piping member used in piping lines such as chemical factories, chemical factories, and water and sewage systems in various industries such as agriculture and fisheries, semiconductor manufacturing, and foodstuffs. A piping member that can be used for connecting or sealing piping in a seawater desalination device or a power plant condenser, etc., where a fluid such as concentrated water flows and high pressure is applied, and connection using the member Or, it relates to a sealing structure.

Plastic piping members have excellent properties in rigidity, heat resistance, and chemical resistance. Industrially, chemical plants, semiconductor manufacturing equipment, bio-related chemical fields, water and sewage, agricultural water It is widely used for fluid transportation in the food field, fishery industry, etc. In particular, resin piping members have resistance to corrosive fluids such as acids and alkalis, and are widely used as substitutes for metal piping.

Such piping member connection methods include flange, screw-in, welded, and welded methods. Of these, the flange type is generally used because of its ease of construction and high sealing performance. ing. In this flange-type connection method, a pair of piping members having a flange portion on the outer periphery on one end side and having a through hole for mounting a bolt in the flange portion is used. The pair of piping members are connected to each other by abutting the pair of piping members so that the flange portions come into contact with each other, attaching a bolt to the through hole, and screwing a nut onto the bolt. In addition, a gasket is interposed between the flange portions to improve the sealing performance of the piping member.

Also, there are cases where high pressure of 1 MPa or more is applied to the piping, such as piping for reverse osmosis membrane use in seawater freshwater plants. Under such a high pressure condition, it is necessary to increase the strength of the piping member, and a piping member made of fiber reinforced resin (hereinafter referred to as FRP) is used as the piping member.

As an example of connection by a flange using an FRP pipe, a pipe formed by providing an FRP layer on the outer periphery of a pipe made of vinyl chloride resin and integrally forming a flange part similarly provided with an FRP layer at the pipe end. Is used as a pipe for piping for a firewood, thermal power generation or hot spring (see Patent Document 1). The purpose was to provide a flanged FRP tube that is resistant to acid / alkali solutions, and is lightweight and excellent in workability.

Further, a connection method is disclosed in which an FRP pipe is connected via a joint, the outer peripheral surface of the joint portion is covered with a reinforced glass molded article, and the reinforced glass molded article is impregnated with resin and cured (Patent Document 2). reference). Its purpose was to reinforce the FRP pipe for high-temperature fluid transportation and to shorten the working time.

Further, a method is disclosed in which a screw is formed on the inner surface of an FRP tube having a thermoplastic resin liner layer, and the FRP tubes are connected to each other by screwing of the screw (see Patent Document 3). A method is also disclosed in which a flange portion is provided in the FRP pipe, bolts are respectively inserted into a plurality of through holes formed in the flange portion, and nuts are screwed into the bolts to connect the FRP pipe.

Japanese Utility Model Publication No. 62-2884 Japanese Patent Laid-Open No. 61-201989 Japanese Patent Laid-Open No. 4-113094

However, the pipe connection method using the flanged FRP pipe described in Patent Document 1 has a structure in which the flange is integrated with the end of the FRP pipe and the outer periphery thereof is reinforced by the FRP layer. Therefore, when trying to make the tube a structure with a higher pressure resistance than before, it is necessary to increase the lamination thickness of the FRP layer, but the bolt hole in the flange portion is blocked, making the structure unsuitable for further higher pressure resistance. It is. Furthermore, it is a structure in which a resin flange is integrated with the outer periphery of the pipe, and since the ratio of resin is necessarily higher than that of FRP, the pipe end is bent and deformed due to insufficient strength under even higher pressure conditions. Problem arises.

In the connection structure described in Patent Document 2, since the connection is made using a socket, stress concentration in the recess becomes a problem. In addition, when a split glass molded product is laminated on the outer peripheral surface of the joint and impregnated with a curable resin, it is considered that the FRP can be laminated without any problem if the laminated thickness of the FRP is thin. When used, it is necessary to use a thick-shaped shaped product, which may cause poor impregnation and defoaming of the resin, resulting in insufficient strength. Moreover, in this connection method, since the connection part of FRP pipe | tubes is integrated, when replacement | exchange etc. of some piping members are needed, it will be necessary to replace | exchange all piping members.

Further, among the connection methods described in Patent Document 3, the screw structure requires a female screw on one inner surface of the FRP pipe and a male screw on the other outer face, which makes the manufacture of the FRP pipe complicated. . Moreover, it is necessary to perform the connection work after confirming the direction of the FRP pipe at the connection site of the FRP pipe, and the connection work is troublesome. Processing on site is also difficult, and connection itself becomes difficult when the pipe has a large diameter. Moreover, in the method of fixing the flange part of patent document 3 with a volt | bolt and a nut, there exists a possibility that sufficient sealing performance may not be obtained under a high pressure. This is because the flange portions firmly come into contact with each other at the contact portion where the bolt head and the nut contact, but the flange portions are placed between the contact portions (between the bolt and the adjacent bolt). This is because the abutting force is weakened, and therefore deformation occurs between the abutting portions under high pressure.

The present invention has been made to solve the above-described conventional problems, and is likely to cause problems such as water leakage and breakage at the connection portion. Even when the resin pipe is used under high pressure, there is little deformation and the like. To provide a pipe connection member that can be easily maintained, such as being able to replace a part of the pipe or connection member even if problems such as breakage or water leakage occur. It is in. Furthermore, in the structure connected or sealed using the piping member of the present invention, the length of the piping can be adjusted.

For this reason, the present invention is a pipe member having a flange structure including a cylindrical portion inserted into an end portion of an arbitrary pipe and a disk-shaped flange portion extending in the circumferential direction from the cylindrical portion. The flange portion has a through hole communicating with the inside of the cylindrical portion, and a seal member is mounted in a groove for a seal member formed on the outer peripheral surface of the cylindrical portion, and the flange An annularly formed spacer is arranged on the surface of the flange portion on the cylindrical portion side of the portion, and the flange portion is provided with a through hole into which an extrusion rod for pressing the spacer can be inserted. Is the first feature.

A pipe member having a flange structure including a cylindrical part inserted into an end of an arbitrary pipe and a disk-like flange part extending in a circumferential direction from the cylindrical part, The flange is characterized in that the center part of the part does not penetrate and has a plate flange structure, and a seal member is mounted in a groove for a seal member formed on the outer peripheral surface of the cylindrical part. An annularly formed spacer is arranged on the surface of the flange portion on the cylindrical portion side of the portion, and the flange portion is provided with a through hole into which an extrusion rod for pressing the spacer can be inserted. Is the third feature.

Furthermore, a fourth feature is that the end portion of the tubular portion is tapered from the end portion of the tubular portion toward the back side so as to be thin.

In addition, a spacer groove is formed in the flange portion surface of the flange portion on the cylindrical portion side so that the spacer can be fitted, and an extrusion rod for pressing the spacer can be inserted into the bottom surface of the spacer groove. A fifth feature is that a through hole is provided.

A plurality of the spacer grooves are provided at equal intervals on the flange portion surface on the cylindrical portion side, and the spacer is fitted into the spacer groove, and the spacer is for the spacer. A seventh feature is that the plate-like body can be fitted into the groove.

The tubular portion of the piping member is inserted into the piping, and the end surface of the piping and the flange surface of the piping member are in close contact with each other directly or via a spacer, and the piping is connected or sealed. Is the eighth feature.

The tubular part of the pipe member is inserted into the pipe, and the pipe to be connected or sealed is larger than the outer diameter of the pipe and is at the shortest distance from the center of the flange surface of the pipe member. An outer layer body that forms a flange portion configured to be smaller than the diameter to the bolt hole, and is in contact with a surface of the outer layer body opposite to a pipe end surface that is in contact with the flange surface of the piping member; The contact member is arranged and connected or sealed by a flange member of the piping member and a clamping member inserted through a through hole provided in the contact member, and the outer layer body is a fiber. The tenth feature is that it is made of a reinforced resin and has a collar portion provided by laminating the fiber reinforced resin.

According to the piping member of the present invention, since the cylindrical portion provided on the flange surface of the piping member having a flange structure is configured to be inserted into the piping, it is intended to be connected or sealed. The flange connection structure can be formed without depending on the external shape of the pipe and without having to form a complicated structure at the pipe end. Furthermore, by disposing the spacer on the flange surface, the connecting member can be easily removed at the time of replacement or maintenance, and damage to the end of the pipe is prevented. In addition, by arranging the spacer, it is possible to adjust the total length of the tube.

In addition, the outer peripheral surface of the cylindrical portion has a structure having a groove and a seal member for mounting the seal member. Since the seal member is compressed by being brought into contact with the inner peripheral surface of the pipe, a high-pressure fluid flows. Even in this case, sufficient pressure resistance can be ensured and water leakage can be prevented.

According to the pipe connection structure of the present invention, since the tubular portion on the surface of at least one end of the pipe member having the flange structure is configured to be inserted into the pipe inner surface, the pipe to be connected or sealed The flange connection structure can be configured without depending on the external shape of the pipe, and it is not necessary to form a complicated structure at the pipe end, and the inner peripheral surface of the pipe and the sealing member provided in the cylindrical part As a result, the sealing member is compressed and watertightness can be secured.

Furthermore, the outer layer body is formed on the outer peripheral surface of the end of the pipe on the inserted side, so that the rigidity of the pipe end can be increased, and the deformation of the pipe due to the bending and vibration of the pipe can be suppressed, thereby improving the water tightness. To do. In addition, since the flange or the flange and the flange structure of the pipe to be connected are connected using the contact member that is in contact with the flange portion of the outer layer body, it is possible to prevent the pipe member from coming off and Pressure resistance and water tightness can be ensured.

By providing a taper on the inner peripheral surface of the cylindrical portion, the internal fluid is rectified and the pressure loss is reduced. Further, the inner area is increased by the taper provided on the inner peripheral surface, and the sealing performance is improved by the action of water pressure.

It is a schematic sectional drawing of the member for piping concerning a first embodiment of the present invention. It is a schematic sectional drawing of the member for piping concerning a second embodiment of the present invention. It is a schematic sectional drawing of the member for piping concerning a third embodiment of the present invention. It is a schematic sectional drawing of the member for piping which concerns on 4th embodiment of this invention. It is a side view of the member for piping concerning a 5th embodiment of the present invention. FIG. 5 is a schematic sectional view taken along line AA in FIG. 4. It is a schematic sectional drawing which shows the connection structure using the member for piping which concerns on 1st embodiment of this invention. It is a schematic sectional drawing which shows the connection structure using the member for piping which concerns on 2nd embodiment of this invention. It is a schematic sectional drawing which shows the connection structure using the member for piping which concerns on 3rd embodiment of this invention.

<First embodiment>
Hereinafter, the piping member according to the first embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, the piping member 1 of the present invention is composed of a flange portion 2 and a cylindrical portion 3, and has a flange structure. A through hole 4 that communicates with the inside of the cylindrical portion 3 is formed in a concentric circle at the center of the flange portion 2. Two grooves 6 for mounting the seal member 5 are formed on the outer peripheral surface of the cylindrical portion 3, and the seal member 5 is mounted in these grooves 6, and the cylindrical portion 3 is inserted into the tube and the tube Connect. The cylindrical part 3 is inserted into the inside of the pipe and compresses the seal member 5, thereby ensuring a sealing property with the pipe and forming a flange structure at the end of the pipe. As the seal member 5, an O-ring, a gasket, a V-ring, an X-ring, or the like can be used. In the cylindrical part 3 inserted into the inside of the pipe, the adhesion with the inner surface of the pipe can be more effectively enhanced by arranging one or more seal members 5 to be mounted. More preferably, two or more may be arranged, and by having two or more sealing members 5, even when the roundness of the inner surface of the pipe is somewhat low, it is possible to reliably seal with two or more sealing members 5, High sealing performance can be secured. Further, by arranging two or more seal members 5, the cylindrical portion 3 to be inserted and the axis of the flange surface can be easily coaxial with the concentric circular axis and the pipe to be inserted, and more effectively the sealing performance. Can be increased.

The outer diameter of the tubular portion 3 is the same as or slightly smaller than the inner diameter of the pipe to be connected. The seal member 5 is formed by the groove 6 for the seal member 5 of the tubular portion 3 and the inner peripheral surface of the tube. However, the outer diameter of the cylindrical portion 3 may be tapered as long as the compressibility is not impaired. Further, the inner peripheral surface and / or the outer peripheral surface of the cylindrical portion 3 is provided with a taper so as to become thicker from the end toward the center. That is, it is formed in a tapered shape from the end portion of the tubular portion 3 toward the back side so that the end portion of the tubular portion 3 is thin. The taper angle is preferably 0.5 to 10 °, more preferably 1.0 to 5.0 °. Furthermore, the inner peripheral surface of the end portion may be formed in an R shape. R is preferably 0.2 to 5.0, and more preferably 1.0 to 4.0.

The material of the piping member 1 is desirably a material having both corrosion resistance and strength. For example, in addition to SUS304, SUS316, SUS316L, SUS317, SUS317L, SUS329J3L, SUS329J4L, etc., the numerical value of the pitting corrosion index exceeds 20. Such metals can be used. In addition, thermoplastic resins such as vinyl chloride resin, polyethylene resin, polypropylene resin, polybutene resin, polytetrafluoroethylene resin, polyvinylidene fluoride resin, unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol resin, urea In addition to thermosetting resins such as resins, melamine resins, furan resins, and silicon resins, titanium, ceramics, and the like can be used depending on the application.

The material of the seal member 5 is not particularly limited, and for example, ethylene propylene diene methylene rubber, chloroprene rubber, nitrile butyl rubber, fluorine rubber, or the like can be used. Further, the number of the grooves 6 may be appropriately changed according to, for example, the water pressure, and is not limited to the above embodiment.

<Second embodiment>
Next, the piping member 7 of the second embodiment of the present invention will be described with reference to FIG. In addition, in 2nd embodiment, the same code | symbol is used about what has the structure similar to 1st embodiment.

As shown in FIG. 2, the piping member 7 of the second embodiment of the present invention has a flange structure as in the first embodiment, and

cylindrical portions

3 and 8 are formed on both sides of the flange portion 2. ing. A groove 10 for mounting the seal member 9 is formed on the outer peripheral surface of the cylindrical portion 8. Since other materials and the like are the same as those in the first embodiment, description thereof is omitted.

<Third embodiment>
Next, the piping member 11 according to the third embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 3, the piping member 11 of the third embodiment of the present invention is a sealing piping member, and has a flange structure as in the first embodiment. The difference from the first embodiment is that the center portion of the flange portion 12 does not penetrate and has a plate flange structure.

<Fourth embodiment>
Next, the piping member 23 according to the fourth embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 4, the piping member 23 according to the fourth embodiment of the present invention has a flange structure as in the first embodiment, and a spacer is provided on the flange portion surface of the flange portion 24 on the cylindrical portion 25 side. 26 is disposed, and the flange portion 24 is provided with a through hole 27 into which an extrusion rod for pressing the spacer 26 can be inserted.

The spacer 26 has an annular shape, and the inner diameter of the annular shape is larger than the outer diameter of the cylindrical portion 25 and is closer to the cylindrical portion 25 than the holding member through-hole 28 formed in the flange portion 24. Is arranged. Further, the annular spacer 26 may be formed in one piece, or may be divided into a plurality of parts such as two parts. Further, the shape of the spacer 26 may be an annular shape or a polygonal shape.

When the spacer 26 is disposed on the piping member 7 according to the second embodiment of the present invention, the outer diameter of the spacer 26 is the same as the outer diameter of the flange portion 2 and is the same as the through hole for the sandwiching member of the flange portion 2. It is preferable to make a similar hole at a position and place it on one side of the flange portion 2.

The material of the spacer 26 is not particularly limited as long as it has strength. In the case of metal, the same material as the piping member 23 is preferable. It may be made of resin, and in that case, it is necessary to have a strength that does not break even when pressed with a bolt or the like. For example, a vinyl chloride resin, a polypropylene resin, a polytetrafluoroethylene resin, a polyvinylidene fluoride resin P, polyamide, polycarbonate, etc., and a reinforcing material such as glass fiber, filler, rubber, cloth, etc. may be included as required.

When extracting the piping member 23 from the piping, the extrusion rods are inserted into the four through holes 27 provided in the flange portion 24 and extracted. The inner surface of the through hole 27 is threaded. By pressing the spacers 26 evenly with four bolts, the bolts act like jacks, and the piping member 23 can be easily removed. The work efficiency during maintenance is greatly improved. In addition, by arranging the spacer 26, the front end of the bolt does not directly contact the pipe, and the surface pressure is dispersed through the spacer, so that the resin pipe can be prevented from being cracked or scratched.

When the inner surface of the through-hole 27 is not cut, a rod-like extruded rod is inserted into the through-hole 27 instead of a bolt, and four extrusions are formed on the end surface of the extruded rod opposite to the side in contact with the spacer 26. The piping member 23 can be easily pulled out by installing a plate-like body that simultaneously contacts the rod and lightly striking the plate-like body.

The thickness of the spacer 26 is preferably about 1 to 10 mm. By changing the thickness of the spacer 26, the length direction can be adjusted. When connecting a plurality of pipes, the total length often does not reach the desired length. Various length adjustments are performed on site, such as cutting the pipe, welding the pipe, and connecting the socket to the pipe. Further, in the case of an FRP pipe, many man-hours such as peeling of the FRP, surface formation of the mother pipe, socket bonding, welding, and re-FRP are required. Therefore, by inserting the spacer 26 between the end of the pipe and the pipe member 23, the length can be easily adjusted. The length of the pipe can be adjusted by the distance from the contact between the flange portion 24 and the tubular portion 25 of the piping member 23 to the groove for the seal member close to the flange portion side. If this distance is too long, the insertability deteriorates and the cost of the member increases. On the other hand, if the length is too short, the shaft core is not stabilized, causing water leakage, and the length of the tube cannot be adjusted. Considering this distance, the thickness of the spacer 26 is preferably about 1 to 10 mm.

<Fifth embodiment>
Next, the piping member 29 according to the fourth embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 5 and 6, the piping member 29 of the fifth embodiment of the present invention has a flange structure as in the fourth embodiment, and the flange portion surface of the flange portion 30 on the cylindrical portion 31 side. A spacer 33 is fitted in the spacer groove 32 formed in the above, and a through hole 34 through which an extrusion rod for pressing the spacer 33 can be inserted is provided on the bottom surface of the spacer groove 32.

As shown in FIG. 5, a plurality of spacer grooves 32 are provided independently on the flange portion surface of the flange portion 30 on the cylindrical portion 31 side in the circumferential direction around the tube core B. In addition to the arrangement shown in the figure, the spacer grooves 32 may be provided in plural, for example, at a constant radial position from the tube core B so that the distance between them is equal to each other in the circumferential direction. Is not to be done. For example, if the plurality of spacer grooves 32 are connected by lines, the force applied to the spacers 33 can be uniformly transmitted as long as the spacer grooves 32 are arranged in a regular triangle or a regular pentagon. Further, for example, the spacer groove 32 may be formed in an annular shape so that the annular spacer 33 can be fitted. Furthermore, the shape of the spacer groove 32 may be any shape that allows the spacer 33 to be fitted, such as a circular shape or a polygonal shape. Thus, the fifth embodiment is summarized as being a piping member having a spacer groove 32 into which the spacer 33 can be fitted.

The shape of the spacer 33 may be an annular, integral or divided type, or may be a square or disc shaped plate that can be fitted into a plurality of spacer grooves 32 provided. Good. Further, a plurality of protrusions may be formed that fit into a plurality of spacer grooves 32 provided in an annular portion. As described above, the spacer 33 can be used in any shape as long as it can be fitted into the spacer groove 32, and it is only necessary to play the same role as in the fourth embodiment. The thickness of the spacer 33 is preferably about the depth of the spacer groove 32 plus about 1 to 10 mm. Other materials and the like are the same as in the fourth embodiment, and thus the description thereof is omitted.

Further, the connection or sealing structure using each piping member will be described with reference to FIGS.

The connection structure shown in FIG. 7 is a connection structure using the piping member 1 according to the first embodiment of the present invention, and the piping member 1 and the annular contact member 13 attached to the piping member 1 in an inserted state. A pipe 14 having a (backing flange) is provided, and the pipe 14 further includes a fiber-reinforced resin outer layer body 16 as an outer layer constituting the flange portion 15.

The piping member 1 is attached to each end on one end side of the pair of pipes 14, and the flange portions 2 of the piping member 1 are connected to each other via the sealing member 17. The abutting member 13 abuts on the end surface on the other end side of the flange portion 15. When the clamping member 18 (bolt / nut) clamps the pair of contact members 13, the contact member 13 presses the flange portion 15 of the pipe 14 toward the flange portion 15 of the other tube 14. The tubes 14 are connected with high sealing ability.

The length of the cylindrical portion 3 is preferably 7 mm or more and 100 mm or less. Further, it is desirable that the length is shorter than the length of the flange portion 15 of the tube 14. If the length of the cylindrical portion 3 is less than the design lower limit value, a sufficient sealing effect cannot be obtained. On the other hand, if the length exceeds the upper limit value, insertion becomes difficult and the weight increases and the tube ends. A large bending moment is generated, which is not preferable. Further, by making the length of the cylindrical portion 3 shorter than the flange portion 15, it is possible to expect the effect of suppressing the stress concentration on the tube 14 and the expansion of the inner surface of the tube 14 when the seal member 5 comes into contact. A sufficient sealing force can be ensured by the structure.

The outer diameter and inner diameter of the tube 14 are not particularly limited, but it is preferable that the tube 14 is provided so that the SDR of the tube 14 is in the range of 11 to 41. Here, SDR is an abbreviation for Standard Dimension Ratio, and is a ratio calculated by the following equation.
SDR = Outer diameter of pipe / Minimum wall thickness

If the value of this SDR is less than the above lower limit value, the thickness of the tube 14 becomes thicker than necessary, and the transport efficiency of the fluid may be reduced. On the other hand, if the value of SDR exceeds the above upper limit, the thickness of the tube 14 becomes too small, and the function of the inner layer as the protective layer may not be sufficiently exhibited, and the need for increasing the thickness of the outer layer arises. There is a fear.

The shape of the tube 14 is not particularly specified, but is preferably a perfect circle. Depending on the application, it may be oval, square or polygonal. As the shape of the tube end, a straight tube having a uniform inner diameter is mainly used. However, a tube having an opening processed to increase the inner diameter of the tube end can be used depending on the application.

The tube 14 is made of a thermoplastic resin. Various thermoplastic resins can be used, but polyolefin is preferable. As this polyolefin, it is preferable to use polyethylene and polypropylene. By using polypropylene, heat resistance, impact resistance, and creep resistance are improved. As the polypropylene, homo, random, block type and the like can be used. Moreover, a vinyl chloride resin, a fluororesin, etc. can also be used.

The collar portion 15 is provided on the outer periphery of the tube 14 and has a cylindrical shape. The flange 15 is provided with an end face on one end side flush with the pipe 14. The end surface on the other end side of the flange portion 15 has an annular surface in contact with the contact member 13, and the annular surface is provided substantially parallel to the end surface on the one end side. Here, both surfaces of the flange portion 15 (the end surface on the one end side and the annular surface) are substantially parallel, not only in a completely parallel state, but also in a mechanical error range, a range of deformation due to clamping of a clamping member, and the like. included.

The length of the flange portion 15 along the axial direction of the pipe 14 (hereinafter referred to as the axial length) is not particularly limited, but the end surface of the flange portion 15 (the contact surface with the piping member 1) and It is preferable that the flange 15 and the contact surface of the contact member 13 are 30 mm or more and 150 mm or less. As a result, the pressing force from the contact member 13 acting on the flange 15 is moderately dispersed, resulting in a sealing force that acts uniformly on the end surface of the flange 15. That is, if the axial length of the flange 15 is less than the lower limit value, the pressing force from the contact member 13 that acts on the flange 15 is not sufficiently dispersed but the sealing that acts on the end surface of the flange 15. There is a possibility that the force will vary, and this variation may cause deformation of the flange 15. On the other hand, if the axial length exceeds the upper limit, the flange 15 becomes too long, and there is a possibility that a sufficient sealing force cannot be obtained on the end surface of the flange 15 due to the clamping of the clamping member 18.

The height of the flange 15 rising from the tube 14 in the radially outward direction (hereinafter referred to as the protruding height) is not particularly limited, but is preferably 3 mm or more, more preferably 7 mm or more. Preferably, it is 10 mm or more. Further, the protruding height of the flange portion is preferably 90 mm or less, more preferably 75 mm or less, and further preferably 60 mm or less. If the protruding height of the flange portion 15 is less than the lower limit value, it is difficult for the pressing force to act on the flange portion 15 accurately from the contact member 13. On the other hand, if the protruding height of the flange 15 exceeds the upper limit, the connection structure of the piping member 1 may be too large.

The outer layer body 16 made of fiber reinforced resin as the outer layer can have a thickness at a portion other than the flange portion 15 of, for example, 3 mm, and can have a thickness at the flange portion 15 of, for example, 25 mm. The thickness of the outer layer other than the flange 15 is preferably 0.1 to 2.5 times the thickness of the tube 14. In particular, when the SDR of the tube 14 is 11, the thickness of the outer layer other than the flange portion 15 is preferably 0.1 to 1.5 times the thickness of the tube 14. When the SDR of the tube 14 is 41, the thickness of the outer layer other than the flange portion 15 is preferably 0.3 times or more and 4 times or less with respect to the thickness of the tube 14. If the thickness of the outer layer is less than the lower limit value, the strength may be insufficient. On the other hand, if the thickness exceeds the upper limit value, the outer diameter may be excessively increased with respect to the inner diameter, and the weight may be excessively increased.

Here, various types of fiber reinforced resins can be used. For example, the fibers include glass fibers, carbon fibers, basalt fibers, silicon carbide fibers, boron fibers, and other inorganic fibers, as well as various stainless fibers and aluminum fibers. Metal fibers such as titanium fiber and copper fiber, and organic fibers such as aluminide fiber, polyketone fiber, polyester fiber, nylon fiber, ramie fiber, bamboo fiber, and jute fiber can be used.

Various resins can also be used for the fiber reinforced resin, such as unsaturated polyester resin, epoxy resin, vinyl ester resin, phenol resin, urea resin, melamine resin, polyurethane resin, silicon resin, allyl resin, Thermosetting resins such as polylactic acid resin are preferably used, but thermoplastic resins such as polyethylene resin, polypropylene resin, and vinyl chloride resin can also be used.

Further, the method for forming the fiber reinforced resin outer layer body 16 is not particularly limited. For example, hand lay-up molding, spray-up molding, filament winding molding, and sheet winding molding can be suitably employed, and pultrusion molding and press molding. Vacuum molding, infusion molding, resin transfer molding, autoclave molding, vacuum assist resin transfer molding, and the like can also be employed.

Further, the ratio of the fiber to the resin of the fiber reinforced resin can be various ratios, but the ratio of the fiber to the entire fiber reinforced resin is preferably 20% by volume or more and 80% by volume or less, preferably 30% by volume. More preferably, it is 70 volume% or less. If the fiber ratio is less than the above lower limit value, there is a possibility that sufficient reinforcing effect of the fiber reinforced resin may not be obtained. On the other hand, if the upper limit value is exceeded, the amount of the resin is insufficient and sufficient adhesive effect cannot be obtained. There is a risk that problems such as reduced strength or poor adhesion may occur.

The abutting member 13 is made of a backing flange and has an annular structure that is inserted through the tube 14. The abutting member 13 includes an abutting portion that abuts on the end surface of the flange portion 15, and an outer diameter that is located in a radially outward direction with respect to the outer diameter of the flange portion 15. The outside of the diameter has a plurality of through holes 19 formed along the axial direction of the tube 14. The plurality of through holes 19 are arranged at equiangular intervals around the axis of the tube 14. In the embodiment of the present invention, eight through holes 19 are arranged at 45 ° intervals. Thereby, the axis of the tube 14 is included in the virtual polygonal shape obtained by connecting the centers of the through holes 19. Although the embodiment of the present invention has been described with eight through holes 19, the number of the through holes 19 can be appropriately changed in design.

Various materials can be used for the contact member 13, such as a resin such as polypropylene, a metal such as aluminum or stainless steel (for example, duplex stainless steel), or a laminate of resin and metal (for example, coated with resin). Various types of metal plates can be used.

The clamping member 18 includes a male screw member 20 inserted into the through hole 19 of the contact member 13 and a female screw member 21 screwed into the male screw member 20. Here, a bolt is used as the male screw member 20, and a nut is used as the female screw member 21. The bolt has a shaft portion on which a male screw is formed and a head portion having a diameter larger than that of the shaft portion, and the head portion is one surface of one contact member 13 (the left contact member 13 in FIG. 4). To the left side). The nut is screwed onto the male screw of the shaft portion and abuts against the other surface of the other abutting member 13 (the right surface of the right abutting member 13 in FIG. 4). By screwing the bolt and nut together, the pair of contact members 13 are clamped. In addition, it is preferable that a volt | bolt and a nut are metal (including the metal which coat | covered resin).

Various members can be employed as the sealing member 17, and O-rings, gaskets, V-rings, X-rings, and the like can be employed. In the illustrated example, an O-ring is used, and an O-ring accommodating groove 22 is formed on the end face of the flange surface of one piping member 1 of the pair of piping members 1. In addition, the material of the sealing member 17 is not specifically limited, For example, ethylene propylene diene methylene rubber, chloroprene rubber, nitrile butyl rubber, fluorine rubber, etc. can be used. Note that a backup ring can be interposed in the groove 22 to prevent the O-ring from protruding.

Since the connection structure of the piping member 1 is configured as described above, a pair of abutting members 13 are clamped by screwing bolts and nuts, and the abutting members 13 hold the flange 15 of the pipe 14. Press toward the flange 15 of the other tube 14. And the sealing member 17 in the groove | channel 22 is press-contacted by the press to this collar part 15. FIG. For this reason, the piping members 1 are connected with high sealing ability. In particular, since the annular contact portion is pressed by the bolts and nuts arranged at equal angular intervals to press the flange 15, the flange 15 can be pressed in a balanced manner in the circumferential direction. .

The connection structure shown in FIG. 8 is a connection structure using the piping member 7 of the second embodiment of the present invention, and a pair of piping members in the connection structure using the piping member 1 of the first embodiment of the present invention. In this connection structure, the piping member 7 is used at the position 1. The piping member 7 is disposed and connected between the pair of pipes 14. Since others are the same as that of the connection structure using the piping member 1 of the first embodiment, the description is omitted.

In the connection structure using the piping member 1 of the first embodiment of the present invention and the connection structure using the piping member 7 of the second embodiment, the pipe 14 is made of a thermoplastic resin, and is used as an outer layer. This is a configuration having an outer layer body 16 made of fiber reinforced resin. The pipe is composed of a liner layer made of a thermoplastic resin and a reinforced layer made of a fiber reinforced resin. The liner layer has a corrosion resistance function, and the reinforced layer enhances pressure resistance. In order to provide water tightness while ensuring corrosion resistance, the above-described configuration is desirable for the pipes to be connected, but one pipe may be a lining pipe or a metal pipe.

The sealing structure shown in FIG. 9 is a sealing structure using the piping member 11 according to the third embodiment of the present invention, and has a fiber-reinforced resin outer layer body 16 as an outer layer and a collar portion 15 formed therein. The pipe member 11 is disposed at the pipe end of the pipe 14, and the pipe member 11 and the pipe 14 are clamped and sealed by the clamping member 18. Since others are the same as that of the connection structure using the piping member 1 of the first embodiment, the description is omitted.

The connection and sealing structure using the piping member of the present invention will be described below based on examples. In addition, the Example described below does not limit the scope of rights of the present invention.

(Example 1)
The piping member 1 of Example 1 is a flanged metal connecting member having a through hole 4 at the center, and has a seal member 5 in the groove 6 of the cylindrical portion 3 as shown in FIG. It has a connection structure as shown in FIG. The connection tube 14 is a polypropylene (hereinafter referred to as PP) tube having an outer diameter of 110 mm, an SDR (Standard Dimension Ratio) of 11, and a total length of 1500 mm. The outer peripheral surface is made of unsaturated polyester resin and glass fiber. The FRP layer was laminated to a thickness of 8.5 mm, and the flange portion 15 was provided by laminating the FRP layer so that the outer diameter was 160 mm 100 mm wide from the end of the tube 14. A pair of such FRP tubes was manufactured. The piping member 1 is inserted into each of the pair of pipes, the flange surfaces of the piping member 1 are brought into contact with each other via an O-ring 17, and a backing flange 13 is disposed on the back surface of the flange portion 15. A pair of FRP pipes were connected by fastening. A water pressure burst test was performed on the obtained piping. The measurement method is to seal both ends of the pipe with metal plate flanges, fill with water so that no air remains inside, and pressurize the internal water pressure with a plunger pump in an atmosphere of 23 ° C ± 1 ° C. It was measured. As a result, there was no breakage or water leakage even at 30 MPa. Subsequently, a seawater immersion test for one year was carried out, but no significant change in appearance was observed.

(Example 2)
The piping member 7 of Example 2 is a metal connecting member having a flange structure in which a through hole is provided at the center as shown in FIG. 2, and

cylindrical portions

3 and 8 are formed on both surfaces of the flange portion 2. The sealing member 6 is provided in the sealing groove 6 of the cylindrical part 3, and the sealing member 9 is provided in the sealing groove 10 of the cylindrical part 8. In the same manner as in Example 1, a pair of FRP pipes with the flange portion 15 provided by laminating FRP layers was manufactured. The pipe member 7 was inserted between the two FRP pipes, and the pipe was connected. The backing flange 13 was disposed on the back surface of the flange portion 15 and fastened with bolts and nuts (see FIG. 8). When a water pressure burst test was carried out on the obtained piping, there was no breakage or water leakage even at 30 MPa. Subsequently, a seawater immersion test for one year was carried out, but no significant change in appearance was observed.

(Example 3)
The piping member 11 of Example 3 has a structure in which the center portion of the flange surface does not penetrate as shown in FIG. In the same manner as in Example 1, an FRP pipe in which the flange portion 15 was provided by laminating FRP layers was manufactured. The piping member 11 was inserted into the FRP pipe, the backing flange 13 was disposed on the back surface of the flange portion 15, and tightened with bolts and nuts (see FIG. 9). When a water pressure burst test was carried out on the obtained piping, there was no breakage or water leakage even at 30 MPa. Subsequently, a seawater immersion test for one year was carried out, but no significant change in appearance was observed.

(Comparative Example 1)
An FRP layer made of unsaturated polyester resin and glass fiber is 8.5 mm on the outer peripheral surface of the tube, leaving a width of 42 mm from one end of a PP tube having an outer diameter of 110 mm, an SDR of 11, and a total length of 1500 mm. Laminated to thickness. Similarly to Example 1, the other end portion was formed with a flange portion made of FRP having a width of 100 mm and φ160 mm, and a backing flange was disposed. A pair of similar pipes are manufactured, and a PP resin socket is inserted and fusion bonded to an end portion 42 mm where the FRP is not laminated, and an FRP having a thickness of 8.5 mm along the outer peripheral surface including the socket and the existing FRP laminated portion. Lamination was done and integrated. When a water pressure burst test was performed on this pipe, the strength was about 25 MPa. Subsequently, a seawater immersion test for one year was carried out, but no significant change in appearance was observed.

(Comparative Example 2)
A flange made of resin is fused and joined to the pipe end of a PP pipe having an outer diameter of 110 mm, an SDR of 11, and a total length of 1500 mm, and an FRP layer made of unsaturated polyester resin and glass fiber is 8.5 mm on the outer peripheral surface. FRP pipes with flanges were produced by laminating to a thickness of 1 mm, and a metal flange having a structure in which the center part of the FRP pipe and the flange surface did not penetrate was fastened with bolts and nuts. When a water pressure burst test was performed on this pipe, water leakage occurred at about 15 MPa. Subsequently, a seawater immersion test for one year was carried out, but no significant change in appearance was observed.

(Comparative Example 3)
An FRP pipe connector structure was manufactured in the same manner as in Example 1, and a metal flange having a structure in which the center portion of the flange surface did not penetrate was fastened with bolts and nuts to form a sealed structure. When a water pressure burst test was performed on this pipe, water leakage occurred at about 18 MPa. Subsequently, a seawater immersion test for one year was carried out, but no significant change in appearance was observed.

(Comparative Example 4)
A pair of SUS304 pipes with an outer diameter of 114.3 mm, SCH of 80, and a total length of 1500 mm are welded together with a φ3.2 mm welding rod, and the center of the flange surface penetrates both ends. A flange made of SUS304 having a structure not formed was welded to form a sealed structure. When a water pressure burst test was performed on this pipe, there was no breakage or water leakage even at 30 MPa. Subsequently, when a one-year seawater immersion test was carried out, rust was generated on the entire tube, centering on the weld.

As described above, since the piping member of the present invention can connect the piping member with high sealing ability, chemical fields such as chemical plants, semiconductor manufacturing equipment, bio-related, water and sewage, agricultural water, food fields, It can be widely used for fluid transportation such as in the fishery industry.

DESCRIPTION OF SYMBOLS 1 Piping member 2 Flange part 3 Cylindrical part 4 Through-hole 5 Seal member 6 Groove 7 Piping member 8 Cylindrical part 9 Sealing member 10 Groove 11 Piping member 12 Flange part 13 Contact member 14 Pipe 15 Gutter part 16 Fiber Reinforced resin outer layer body 17 Gasket 18 Holding member 19 Through hole 20 Male screw member 21 Female screw member 22 Groove 23 Piping member 24 Flange portion 25 Cylindrical portion 26 Spacer 27 Through hole 28 Holding member through hole 29 Piping member 30 Flange 31 Cylindrical portion 32 Spacer groove 33 Spacer 34 Through hole 35 Nipping member through hole

Claims

A pipe member having a flange structure including a cylindrical portion inserted into an end portion of an arbitrary pipe and a disk-like flange portion extending in a circumferential direction from the cylindrical portion, There is a through-hole communicating with the inside of the cylindrical portion at the center, a seal member is mounted in a groove for a seal member formed on the outer peripheral surface of the cylindrical portion, and the cylindrical portion of the flange portion An annular spacer is disposed on the side flange portion surface, and the flange portion is provided with a through-hole through which an extrusion rod for pressing the spacer can be inserted. Element.
A pipe member having a flange structure including a cylindrical portion inserted into an end portion of an arbitrary pipe and a disk-like flange portion extending in a circumferential direction from the cylindrical portion, A piping member, wherein a central portion does not penetrate and has a structure of a plate flange, and a sealing member is mounted in a groove for a sealing member formed on an outer peripheral surface of the cylindrical portion.
An annularly formed spacer is arranged on the flange portion surface of the flange portion on the cylindrical portion side, and the flange portion is provided with a through-hole through which an extrusion rod for pressing the spacer can be inserted. The piping member according to claim 2, wherein:
2. The piping member according to claim 1, wherein the pipe member is tapered from the end of the cylindrical portion toward the back side so that the end of the cylindrical portion is thin.
A spacer groove capable of fitting the spacer is formed on the flange portion surface of the flange portion on the cylindrical portion side, and an extrusion rod for pressing the spacer can be inserted through the bottom surface of the spacer groove. The member for piping according to claim 1, wherein a hole is provided.
6. The pipe for piping according to claim 5, wherein a plurality of the spacer grooves are provided at equal intervals on the flange portion surface on the cylindrical portion side, and the spacer is fitted into the spacer groove. Element.
The piping member according to claim 6, wherein the spacer is a plate-like body that can be fitted into the spacer groove.
A spacer groove capable of fitting the spacer is formed on the flange portion surface of the flange portion on the cylindrical portion side, and an extrusion rod for pressing the spacer can be inserted through the bottom surface of the spacer groove. The piping member according to claim 3, wherein a hole is provided.
A spacer groove capable of fitting the spacer is formed on the flange portion surface of the flange portion on the cylindrical portion side, and an extrusion rod for pressing the spacer can be inserted through the bottom surface of the spacer groove. The member for piping according to claim 4, wherein a hole is provided.
The piping for a pipe according to claim 8, wherein a plurality of the spacer grooves are provided at equal intervals on the flange surface on the cylindrical portion side, and the spacers are fitted into the spacer grooves. Element.
The piping for a pipe according to claim 9, wherein a plurality of the spacer grooves are provided at equal intervals on the flange portion surface on the cylindrical portion side, and the spacer is fitted into the spacer groove. Element.
The piping member according to claim 10, wherein the spacer is a plate-like body that can be fitted into the spacer groove.
12. The piping member according to claim 11, wherein the spacer is a plate-like body that can be fitted into the spacer groove.
The tubular portion of the piping member according to any one of claims 1 to 13 is inserted into the piping, and the end surface of the piping and the flange surface of the piping member are in close contact with each other directly or through a spacer. The connection or sealing structure is characterized in that the pipe is connected or sealed.
The tubular part of the piping member according to any one of claims 1 to 13 is inserted into the piping, and the piping is larger than the outer diameter of the piping and from the center of the flange surface of the piping member. A surface of the outer layer body that has an outer layer body that forms a flange portion that is configured to be smaller than a diameter to a bolt hole at the shortest distance and that is opposite to a pipe end surface that is in contact with the flange surface of the piping member. A contact member formed in contact with the flange, and connected or sealed by a clamping member inserted through a flange of the piping member and a through hole provided in the contact member Construction.
The connection or sealing structure according to claim 15, wherein the outer layer body is made of a fiber reinforced resin and has a collar portion provided by laminating the fiber reinforced resin.