JP4920485B2 - Sanitary piping fittings - Google Patents

Description

  The present invention relates to sanitary piping used in the manufacture of foods, pharmaceuticals, cosmetics, and the like, and more particularly to a sanitary piping joint that connects sanitary piping.

  Conventionally, sanitary piping is used in manufacturing process lines for foods and pharmaceuticals, but since the raw material flowing in the pipe adheres to the pipe wall, it is necessary to clean and clean the inside of the pipe for hygiene purposes. In addition, when manufacturing by switching products, in order to prevent product raw materials adhering to the tube wall from adhering to the tube wall from mixing into the products after switching, it is necessary to clean the tube. This is very important.

In the sanitary piping, since the pipes are connected to each other through a joint, in order to clean the inside of the pipe, the joint needs to be attached and detached. Therefore, the following joints have been developed to facilitate the attachment / detachment of the joints (for example, see Patent Document 1).
A flange portion is formed on the shaft opposite to the side connected to the pipes of both short members, and the surface opposite to the flange portion is formed into a taper shape between the flange portions formed on both short tube members. The taper-shaped flange portion is clamped with a packing interposed therebetween, and the two pipes are connected in a watertight manner.

  The packing is used for maintaining sealing performance, and silicon-based plastic, polytetrafluoroethylene resin (PTFE), or the like is used as a material for the packing. This packing (gasket) is a disc annular body having a predetermined thickness that is concentrically cut through the center portion, and has convex portions above and below the disc portion concentrically with the annular body (for example, , Patent Document 2).

Registration model No. 3037380 JP-A-5-99343

  In Patent Document 1, a gasket (packing) is sandwiched between both flange portions to prevent leakage. However, if the clamping force of both flanges is too strong and the packing is tightened too much, depending on the material of the gasket, the gasket may be deformed. There is a possibility that the diameter of the road is closed or the gasket is damaged and mixed into the pipe.

  In Patent Document 2, when the tightening stress of the gasket (packing) is large, the through hole at the center of the gasket is deformed (elongated) by the stress. For this reason, the diameter of the through hole is smaller than the design value, so that an accident in which water accumulates in the pipe line occurs. Also, if silicon plastic or ethylene propylene rubber is used as the gasket (packing) material, it will deteriorate over time and some of it will fall into the piping and be mixed into the product as foreign matter. .

  In Patent Document 2, a flange is provided on the outer peripheral edge of the packing, and the gasket is temporarily fixed to the flange so as not to drop when the packing is attached or detached. However, since the packing must be mounted while accurately positioning the flange portion on the outer peripheral surface of the flange portion, it is troublesome and takes time. In addition, since the flange portion is mounted in a state of protruding on the outer peripheral surface of the flange portion, it is not preferable in appearance and may be caught by an object and become an obstacle.

  In view of the above circumstances, an object of the present invention is to enable a packing to be easily and reliably attached to and detached from a ring-shaped groove. Another object is to prevent a part of the gasket (packing) from falling into the pipe.

The present invention provides a pair of joint portions disposed with a smooth contact surface facing each other, a ring-shaped groove formed on the smooth contact surface, and the smooth contact surface fitted into the ring-shaped groove. In a sanitary piping joint comprising a packing for sealing between and a fastening fixing means for connecting the two joint portions and fastening the packing; the packing is a fluororesin having an axial cross section formed in a trapezoidal shape Ltd. packing der is, the ring-shaped groove is of the smooth abutment surface, the joint axis side is lacking is formed into a trapezoidal cross section, the groove bottom inclined outwardly toward the rear side It is characterized by that.

The tightening and fixing means of the present invention are provided on an arc-shaped clamp piece that is connected to each other by a connecting piece and is fitted on the tightening taper surface portion of the joint, and both the arc-shaped clamp pieces, a mounting projecting portion opposite to said rules clamp der Rukoto to that provided with the bolt and a nut connecting the both mounting projecting portion.

  The inner diameter of the packing of the present invention is formed to be the same as the inner diameters of the two joints, the thick part side of the packing is pressed against the groove bottom part of the one ring-shaped groove, and the thin part side is the other side. It is in contact with the groove bottom of the ring groove.

  Since the packing according to the present invention is a fluororesin packing having a trapezoidal cross section in the axial direction, the thick-walled portion of the packing is pressed against and firmly fixed to the groove bottom of one ring-shaped groove. However, the thin-walled portion is in contact with the bottom of the other ring groove and is fixed weaker than the thick-walled portion. Therefore, when the packing is fitted into the ring groove, if the thick portion side is pushed into the ring-like groove and fitted, it does not fall even if the hand is released from the packing. Further, when the joints are separated when the joint is removed, the thick part side of the packing is in pressure contact with the ring-shaped groove and the thin part is in contact with the ring-shaped groove. The part side maintains the state fixed to the ring-shaped groove, and the thin-walled part side comes out of the ring-shaped groove. Therefore, the packing does not fall even when the joint portion is removed.

  Unlike the conventional example (Patent Document 2), the packing does not include a collar portion, so that the problem as in the conventional example can be prevented.

  Since the packing is formed of a fluororesin, it is excellent in heat resistance, wear resistance, non-adhesiveness, low friction, weather resistance, and the like. Therefore, unlike a silicon rubber packing, it is possible to prevent a part of the packing from peeling off and falling into the pipe.

  In the present invention, since the ferrule clamp is provided, a monitoring gap can be generated between the abutting surfaces when packing is attached to both joint portions and tightened. If this fluororesin packing is worn due to aging, the sealing force will weaken, so the clamping force will be strengthened and the packing will be tightened to reduce the monitoring gap, but if the sealing force is sufficient, it will be tightened further. Can not be. In this way, while the clamp is repeatedly tightened, the contact surfaces come into contact with each other, and the packing cannot be tightened. At this time, since the packing is in a state to be replaced, it is replaced with a new one. In this way, it is possible to know the timing of packing.

An embodiment of the present invention will be described with reference to FIGS.
The sanitary piping joint 1 includes a pair of joint portions 3 and 4 that face each other. The end surfaces of the joint portions 3 and 4 are smooth contact surfaces, that is, flat vertical surfaces, 3a and 4a, and the outer peripheral surfaces thereof are provided with the contact surfaces 3a and 4a and horizontal surfaces 3b and 4b. The fastening taper surface portions 3c and 4c are continuous. Both the tapered surface portions 3c and 4c are formed symmetrically with respect to each other, and the inclination angles thereof are the same.

  The ring-shaped grooves 7 and 8 are formed by notching the center axis C side of the joint portions 3 and 4 of the contact surfaces 3a and 4a. The axial cross sections of the ring-shaped grooves 7 and 8 are trapezoidal, and the groove bottom portions 7a and 8a are inclined outward toward the back side. The side walls 7b and 8b of the grooves 7 and 8 are vertical walls parallel to the abutting surfaces 3a and 4a.

  The packing (also referred to as “gasket”) 12 is a Teflon (registered trademark) ring, and its axial (diameter) direction cross section is formed in a trapezoidal shape. The Teflon (registered trademark) is a trade name of a fluororesin. Specific examples of the fluororesin include, for example, polytetrafluoroethylene (PTFE), perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene. -Hexafluoropropylene copolymer (FEP).

  Each of the four sides of the packing 12 is a smooth surface, and its inner diameter d is formed to be the same as the diameter of the inner peripheral surfaces 3d and 4d of the joint portions 3 and 4. Further, the bottom 12a side of the packing 12 is a thick portion 12A, and the head side 12b side is a thin portion 12B which is thinner than the thick portion 12A. The thick portion 12A is formed in a congruent shape with the phosphorus grooves 7 and 8. The difference between the length of the base 12a and the length of the head 12b is, for example, 3 mm, and the side connecting the ends of both sides 12a, 12b is inclined at an angle θ, for example, θ = 3 degrees. Yes.

  The joints 3 and 4 are connected by a ferrule clamp 15 and integrated. The ferrule clamp 15 is connected to first and second clamp members 16 and 17 formed in an arc shape and one end of both the clamp hen members 16 and 17, and both the members 16 and 17 are rotatably connected. The connecting piece 19 is connected to a mounting protrusion 16 a provided at the other end of the clamp member 16. The bolt 21 passes through the mounting protrusion 17 a of the clamp member 17 and is screwed to the bolt 21. And a wing nut 23. The clamp members 16, 17 have a fitting recess 24, and both side walls 24 a, 25 b are fitted to the fastening taper surface portions 3 c, 4 c of the joint portions 3, 4.

Next, the operation of this embodiment will be described.
Disassembly of sanitary piping joint:
When cleaning the sanitary pipe, the bolt 21 is removed by rotating the wing nut 23 in a loosening direction, and the fixation of the ferrule clamp 15 is released.

  In this state, the thick portion 12 </ b> A of the packing 12 is in pressure contact with the bottom of the ring-shaped groove 7, and the thin portion 12 </ b> B is in contact with the ring-shaped groove 8. Therefore, when one joint part 3 is pulled and separated from the other joint part 4, the packing 12 comes out of the ring-shaped groove 8 while being fixed to the joint part 3, so that the packing 12 is not dropped. Absent.

Thereafter, the packing 12 is pulled and extracted from the ring-shaped groove 7 to clean (clean) the pipe joints 3 and 4.
Sanitary piping assembly:
After the pre-cleaning is completed, the thick portion 12A of the packing 12 is press-fitted and fitted into the ring-shaped groove 7 of the joint portion 3, and is brought into pressure contact with the groove bottom portion 7a. At this time, the packing 12 is firmly fixed to the ring-shaped groove 7 in a cantilever state.

  In this state, the thin portion 12B of the packing 12 is inserted into the ring-shaped groove 8 of the joint portion 4. Thereafter, the clamp members 16 and 17 are fitted to the tapered surface portions 3c and 4c, and the wing nut 23 is tightened by rotating in the tightening direction. At this time, the packing 12 is fitted into both the ring-shaped grooves 7 and 8, and both bottom walls 12 a and head walls 12 b are in close contact with both side walls of the ring-shaped grooves 7 and 8. The outer peripheral surface on the 12B side is in contact with the groove bottom 8a, and there is almost no gap.

Changing the packing:
In the above state, the monitoring gap w is vacant between the two contact surfaces 3a and 4a. This gap w serves as a standard for determining the replacement time of the packing 12.
That is, when the packing 12 decreases due to secular change, the wing nut 23 is turned and tightened, and tightened to the extent that it does not turn any more, so that the sealing force is maintained. As the adjustment process is repeated, both the contact surfaces 3a and 4a come into contact with each other.

  When the two abutting surfaces 3 and 4 come into contact with each other, the packing 12 has reached the use limit. Therefore, replace with a new packing. Thus, it is possible to know the replacement time of the packing from the monitoring gap w.

It is a top view which shows the Example of this invention. It is the II-II sectional view taken on the line of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a front view of packing. It is the VV sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sanitary piping joint 3 Joint part 3a Smooth contact surface 4 Joint part 4a Smooth contact surface 7 Ring-shaped groove 8 Ring-shaped groove 12 Packing 12A Thick part 12B Thin part 15 Ferrule clamp

Claims (3)

A pair of joints arranged with the smooth contact surfaces facing each other, a ring-shaped groove formed in the smooth contact surface, and fitted in the ring-shaped groove, sealing between the smooth contact surfaces In a sanitary piping joint comprising a packing and a fastening means for connecting the two joint portions and fastening the packing;
The packing, the axial cross section is formed in a trapezoidal shape, Ri fluororesin packing der,
The ring-shaped groove is formed in a trapezoidal cross-section by lacking the joint axial center side of the smooth contact surface, and the groove bottom portion is inclined outward toward the back side. Sanitary piping joint. The fastening means are connected to each other by connecting pieces, and are attached to the arcuate clamp pieces fitted on the fastening taper surface portion of the joint part, and the two arcuate clamp pieces, and are attached to each other. protrusion and, sanitary piping joint according to claim 1, wherein the rule clamp der Rukoto to that provided with the bolt and a nut connecting the both mounting projecting portion. The inner diameter of the packing is formed to be the same as the inner diameter of the joints, the thick wall side of the packing is pressed against the groove bottom of the one ring groove, and the thin wall side is the other ring groove. claim 1, characterized that you have contact with the groove bottom portion, or, 2, wherein the sanitary piping joint.

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