JP3872569B2 - Fluid coupling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluid coupling in which two coupling members are detachably and fluid-tightly coupled via a clamp.
[0002]
[Problems to be solved by the invention]
Conventionally, a fluid coupling as shown in FIG. 4 is shown as a fluid coupling in which end faces of flanges provided at the ends of two pipes are butted against each other, and the flange is sandwiched from outside in the radial direction by a clamp to be fluid-tightly coupled. Is provided.
[0003]
In this fluid coupling, tapered flanges 92a and 93a having tapered surfaces are provided at the pipe ends of two pipes 92 and 93, and the inner tapered surface of the clamp 91 is joined to the tapered surfaces of the tapered flanges 92a and 93a. A packing 94 is interposed between the end faces of 92a and 93a, and the clamp 91 is tightened with a clamp bolt (not shown), so that the taper flanges 92a and 93a are pressed against each other with the packing 94 interposed therebetween, thereby providing a complete sealing function. It ’s a good day.
[0004]
However, such a fluid coupling is a simple tube at the center of a joint that has a structure in which a simple tube penetrates the center of a hollow conduit fixed to the reactor, such as a joint for an in-core measurement device of a nuclear reactor. Since 3 penetrates, packing 94 cannot be removed unless simple tube 3 is extracted at the time of disassembly, and cannot be used for such a type of joint.
[0005]
Therefore, an object of the present invention is to provide a fluid coupling that can be disassembled and assembled without being hindered even if a simple tube passes through the center, and can prevent fluid leakage without disassembling the joint. There is.
[0006]
[Means for Solving the Problems]
The present invention solves the above-mentioned problems, and the gist thereof is described below .
[0007]
It is a joint for connecting a conduit and a simple tube that is inserted into the conduit and protrudes to the atmosphere side of the conduit. The first and second joints are disposed at the conduit end and the piping portion of the simple tube. The end face of the end flange formed on the tubular joint member and the first and second tubular joint members are abutted to each other, and the seal member is disposed on the abutting end face of the end flange. In the fluid coupling configured to hold the end flange from the outside in the radial direction by the first half and the second half of the clamp, the first and second tubular coupling members are the end portions. The end surfaces of the flanges that are not abutted are formed as outwardly inclined tapered surfaces, and the first and second halves are opposed to the tapered surfaces of the end flanges. A recess for fitting an annular seal member into which a recess for fitting the end flange is formed, and an annular seal member for sealing the abutting side of the end flange is inserted into the recess. The annular seal member includes an annular O-ring holding member having an O-ring mounting groove on the inner peripheral surface, and an O-ring fitted in the O-ring mounting groove, and the first half body And one end of the second half are rotatably connected by a connecting bolt, and a base end of a tightening bolt is rotatably attached to the other end of the first half. by tightening the threaded nut, it is in the fluid coupling, characterized in that the first half and the second half is Ru are fixed to each other.
[0008]
According to the above means, when the first half and the second half of the clamp are joined together, they are guided by the tapered surface of the end flange and approach each other. The force which makes it mutually approach along an axial direction works, and both joint members are joined firmly. When the first half and the second half are strongly joined, the tapered portion of the end flange and the recess for fitting the flange fit firmly, thereby improving the sealing performance of the coupling portion. be able to.
[0009]
A seal member fitting recess for inserting an annular seal member that seals the butted end face of the end flange is formed continuously with the recess for fitting the flange. A double seal structure including a seal member arranged from the beginning and a seal member in a recess for fitting the seal member can be formed, and the sealing performance can be improved also from this surface.
[0010]
In addition, since the seal member includes an annular O-ring holding member having an O-ring mounting groove on the inner peripheral surface and an O-ring fitted in the O-ring mounting groove, fluid can flow from the abutting portions of both joint members. In the case of leakage, the clamp is removed and, for example, an annular seal member is fitted into the end portion of the pipe, and then the seal member is moved along the pipe to bring it to the butted portion of both joint members of the fluid coupling. Then, the sealing member is forcibly fitted so as to straddle both end flanges. Thereby, a seal | sticker is given to the butt | matching part of both the coupling members of a fluid coupling. After that, if both the joint members are joined by a clamp, a double seal structure is formed with the seal member arranged from the beginning on the butt end surface and the added seal member, and leakage from the butt portion of both joint members is prevented. Is done.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
[0012]
1 to 3 show an embodiment in which the present invention is applied to a joint for an in-core measuring device of a nuclear reactor, FIG. 1 is an external view of the joint for an in-core measuring device, and FIG. 2 is an AA line in FIG. Sectional drawing and FIG. 3 are BB arrow line views of FIG.
[0013]
The in-core measurement device joint according to this embodiment includes a conduit 2 that is fixed to the bulkhead 1 of the nuclear reactor and whose upper end is on the atmosphere side, and is guided into the reactor 2 and inserted into the reactor. Conduit 2 is connected to simple tube 3 projecting to the atmosphere side of conduit 2, and conduit side nut 4 and conduit side male thread member 5 fitted on the upper end of conduit 2, respectively, and simple tube 3 is provided with a simple tube side nut 6 and a simple tube side male screw member 7 which are fitted to each other near the upper end of 3, and a clamp 8 which detachably couples both male screw members 5 and 7. A nut 13 and a tubular joint member 14 are further provided at the upper end of the simple tube 3.
[0014]
The conduit-side male screw member 5 has a threaded portion 21 at the lower end, a center flange 22 having a regular hexagonal cross section at the center, and an end flange 23 having a circular cross section at the upper end, and a lower portion thereof. The threaded portion 21 provided on the conduit side is screwed onto the conduit side nut 4. The simple tube side male thread member 7 has a threaded portion 24 at the upper end, a central flange 25 having a regular hexagonal cross section at the center, and an end flange 26 having a circular cross section at the lower end. The male thread portion 24 provided on the upper portion is screwed into the simple tube side nut 6.
[0015]
An O-ring insertion groove 27 is provided on the upper end surface of the conduit-side male screw member 5, and the sealing performance of the butted end surfaces of the end flanges 23 and 26 is ensured by the O-ring 28 fitted therein. ing. The end flanges 23 and 26 have the same outer diameter, and taper portions 23a and 26a having smaller diameters as they move away from the abutting end surfaces are provided on the end surfaces on the back side of the abutting end surfaces of the flanges 23 and 26, respectively. In addition, an annular fitting convex portion 29 is provided on the inner peripheral portion of the lower end surface of the simple tube side male screw member 7 so as to protrude downward, and on the inner peripheral portion of the upper end surface of the conduit side male screw member 5. A fitting recess 30 that fits into the fitting protrusion 29 is provided.
[0016]
8 is a clamp. 2 and 3, the clamp 8 includes a left half body 31 and a right half body 32 that sandwich the end flanges 23 and 26 of the male screw members 5 and 7 faced to each other from both sides in the radial direction. The left half 31 and the right half 32 are provided with recesses 53 for fitting the flanges corresponding to the tapered portions 23a and 26a of the end flanges 23 and 26, respectively.
[0017]
The left half body 31 and the right half body 32 are both formed to have wide left and right and front and rear widths and are connected to a recess 53 for fitting a flange. A recess 54 for fitting a sealing material having a semicircular shape and a square cross section as viewed from above is formed.
[0018]
The annular seal member 60 inserted into the recess 54 for fitting the seal material is an annular O-ring that is slightly larger than the outer diameter of the inner diameter end flanges 23 and 26 and has an O-ring mounting groove 62 on the inner peripheral surface. The holding member 61 and two O-rings 63 fitted in the O-ring mounting groove 62 are included. The annular seal member 60 is held by the flange portions 23 and 26 of both male screw members 5 and 7 by the elastic force of the compressed O-ring 63.
[0019]
The left half 31 is provided with pins 35 and 36 that penetrate the front end and the rear end, respectively, and the right half 32 is provided with a pin 37 that penetrates the front end. The pin 35 at the front end portion of the left half 31 and the pin 37 at the front end portion of the right half 32 are coupled by a connection bolt 38. Thereby, the left half body 31 and the right half body 32 are rotatable with respect to the pins 35 and 37 as axes.
[0020]
A base end portion of a tightening bolt 39 is rotatably attached to the pin 36 at the rear end portion of the left half body 31. The left half 31 and the right half 32 are partially removed so as to be H-shaped when viewed from the side in order to pass through the connection bolt 38 and the fastening bolt 39. A washer 41 is fitted into the tip of the tightening bolt 39, and a flanged nut 40 is screwed onto the washer 41.
[0021]
When the nut 40 is loosened, the tightening bolt 39 can be rotated. Therefore, the left half 31 and the right half 32 are fixed to each other only by tightening the nut 40. The tip of the tightening bolt 39 is caulked to have a flat shape so that the nut 40 does not fall off. A recess 42 in which a washer 41 is accommodated is provided at the rear end of the right half 32.
[0022]
Between the conduit-side male screw member 5 and the conduit-side nut 4, two clamping sleepers (ferrules) 9 and 10 having a wedge-shaped cross section are interposed, and the nut 4 is attached to the male screw member 5. By tightening, the tightening sleeps 9 and 10 are deformed radially inward to press the conduit 2 radially inward, whereby the conduit-side male screw member 5 and the conduit 2 ensure sealing performance. Are combined.
[0023]
The center flanges 22 and 25 of the male screw members 5 and 7 are used to hang a spanner so that the male screw member 5 does not rotate together when the nut 4 is tightened. Similarly, between the simple tube side male thread member 7 and the simple tube side nut 6, two tightening sleeps (ferrules) 11 and 12 having a wedge-shaped cross section are interposed. By tightening the male screw member 7, the tightening sleeps 11 and 12 are deformed radially inward and press the simple tube 3 radially inward, whereby the male screw member 7 and the simple tube 3 are Is secured to ensure sealing performance.
[0024]
In the in-core measuring device fluid coupling configured as described above, in order to mount the clamp 8, the end flanges 23, 26 of the male screw members 5, 7 with the clamp nut 40 loosened. The left half body 31 is engaged with the left half body 31 from one side in the radial direction, and then the right half body 32 is rotated so that the end flanges 23 and 26 of both male screw members 5 and 7 Engage from the direction. Next, the tightening bolt 39 is rotated so that the washer 41 fits into the recess 42, and then the nut 40 is tightened. The recess 42 in which the washer 41 is accommodated is formed into a notch shape larger than the semicircle with the rear part missing as viewed from the right side of FIG. When an external force is applied to rotate in the direction of the chain line, the rear edge of the recess 42 and the washer 41 are engaged to prevent the tightening bolt 39 from rotating in the disengaging direction.
[0025]
According to the in-furnace measuring device joint, in order to connect the conduit 2 and the simple tube 3, the conduit side nut 4 is tightened to fix the conduit side male screw member 5 to the conduit 2, and the simple tube side nut 4 Then, the simple tube side male screw member 7 is fixed to the simple tube 3. Then, the end flange 23 of the conduit-side male screw member 5 and the end flange 26 of the simple tube-side male screw member 7 are brought into contact with each other.
[0026]
When pulling out the simple tube 3 to the outside of the reactor at the time of fuel replacement, the simple tube side male screw member 7 and the simple tube 3 coupled thereto are moved in the longitudinal direction with respect to the conduit 2 by removing the clamp 8. After that, the simple tube 3 can be pulled out from the conduit 2. At this time, the conduit side nut 4 is not loosened, and the conduit side male screw member 5 remains fixed to the conduit 2.
[0027]
After the fuel exchange is completed, the reactor can be operated only by tightening the clamp 8 via the nut 40 and the tightening bolt 39. Therefore, since the work involved in the fuel change is only the loosening and tightening of the tightening bolt 39 of the clamp 8 repeatedly, the conduit-side nut 4 and the conduit-side male thread member 5 that are difficult to be replaced are repeatedly loosened and tightened. There is no wear or deformation.
[0028]
Further, the clamp 8 can be loosened and tightened with only one tightening bolt 39, and the work can be easily performed. Further, the tightening bolt 39, the nut 40, the washer 41, and the O-ring at the butt end face that are necessary for loosening and tightening the clamp 8 can be easily replaced, thereby ensuring the sealing performance at all times.
[0029]
Further, by simply tightening the clamp 8, the simple tube 3 is prevented from coming off, and an accident of the simple tube 3 coming off leading to cooling water leakage is prevented.
[0030]
In the unlikely event that fluid leaks from the abutting portions of the male screw members 5 and 7, the clamp 8 is removed and, for example, the annular seal member 60 is fitted into the end portion (not shown) of the pipe, and then the pipe is inserted into the pipe. Then, the seal member 60 is moved along and brought up to the butted portion of the both male screw members 5 and 7. Since the inner diameter of the seal member 60 is slightly larger than the outer diameter of the end flanges 23 and 26, the nut can pass through. When the upper end flanges 23 and 26 are passed, the O-ring 63 and the flanges 23 and 26 It is forced to pass against the frictional force between.
[0031]
Finally, the seal member 60 is fitted so as to straddle the end flanges 23 and 26 of both male screw members 5 and 7. As a result, a seal is applied to the abutting portion of both the male screw members 5 and 7. Thereafter, if the male screw members 5 and 7 are joined by the clamp 8, a double seal structure is formed by the O-ring 28 arranged from the beginning on the butt end surface and the O-ring 63 of the added seal member 60. Leakage of fluid from the butted portions of both male screw members 5 and 7 is prevented.
[0032]
When the leakage occurs, the clamp 8 may be replaced with a new clamp 8 together with the seal member 60, or may be replaced with a new clamp 8 without the seal member 60.
[0033]
【The invention's effect】
The present invention is configured as described above, and according to the present invention, when the first half and the second half of the clamp are coupled, the force that causes the end flanges to approach each other along the axial direction is increased. The taper portion of the end flange and the recess for fitting the flange are firmly fitted, thereby improving the sealing performance of the coupling portion.
[0034]
Continuous to the recess for fitted the end flange, for inserting an annular seal member for sealing the abutting side surface of the end flange, the seal member fitted into the recess is formed, if necessary a seal member disposed from the beginning butted end faces of the end flange, by an annular sealing member recess for fitted sealing material can be a double seal structure, improvement of sealing property from the surface I can plan.
[0035]
In addition, since the annular seal member includes an annular O-ring holding member having an O-ring mounting groove on the inner peripheral surface and an O-ring fitted in the O-ring mounting groove, fluid flows from the butted portions of both the joint members. If the leaked, remove the clamp fitted an annular seal member, along the pipe to move the annular seal member, butt both joint members of the fluid coupling, so that across the annular sealing member in both end flanges after straining facilities a seal abutting side portions of both the joint members of the fluid coupling forcibly fitted together in, by coupling the two coupling members by a clamp, and a seal member disposed from the beginning butted end faces, add Thus, a double seal structure with the annular seal member is provided, and leakage from the butted portions of both joint members can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a side view of a joint for a reactor measuring device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG.
FIG. 4 is a cross-sectional view of a main part of a conventional fluid coupling.
[Explanation of symbols]
1 Bulkhead 2 Conduit 3 Simple tube 4 Conduit side nut 5 Conduit side screw member 6 Simple tube side nut 7 Simple tube side screw member 8 Clamps 22 and 25 Center flange 23 End flange 26 End flange 28 O-ring 31 Left half Body (clamp)
32 Right half (clamp)
53 Recess 54 Recess 60 Annular seal member 61 O-ring holding member 63 O-ring

Claims (1)

It is a joint for connecting a conduit and a simple tube that is inserted into the conduit and protrudes to the atmosphere side of the conduit. The first and second joints are disposed at the conduit end and the piping portion of the simple tube. The end face of the end flange formed on the tubular joint member and the first and second tubular joint members are abutted to each other, and the seal member is disposed on the abutting end face of the end flange. In the fluid coupling configured to hold the end flange from the outside in the radial direction by the first half and the second half of the clamp, the first and second tubular coupling members are the end portions. The end surfaces of the flanges that are not abutted are formed as outwardly inclined tapered surfaces, and the first and second halves are opposed to the tapered surfaces of the end flanges. A recess for fitting an annular seal member into which a recess for fitting the end flange is formed, and an annular seal member for sealing the abutting side of the end flange is inserted into the recess. where is formed, the annular sealing member, and the O-ring holding member of annular having an O-ring mounting groove on the inner peripheral surface, Ri more the O-ring which is fitted in the O-ring mounting groove, the first half One end of the body and the second half is rotatably connected by a connecting bolt, and the base end of the tightening bolt is rotatably attached to the other end of the first half, and the tightening bolt in by tightening a threaded nut, the first half and the second half and are fixed to one another fluid coupling according to claim Rukoto.

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