CZ1878U1 - Tapping saddle of tapping band, particularly for pipe branch of supply line - Google Patents

Description

Technical field

The technical solution concerns the tapping seat of the tapping strip of the water supply pipe connection and solves by a suitable structural adjustment of the seat seating part a high tightness of the connection of this element to the flexible, plastic pipe permanently filled with pressure water without undue deformation and damage of the used sealing elements which caused the reduced the tightness of the connections created, which was reflected in the considerable losses in the quantity and pressure of the transported medium and in possible damage to buildings or utilities.

Background Art

So far, the connection of the branch, ie the house connection, to the central water supply system has been carried out by drilling a water pipe through a drilling machine. The tapping machine consists of a tapping seat (sleeve) that is mounted on the pipe and fixed by two eg cast iron stirrups on whose free ends tightening nuts are screwed. The tightness between the cylindrical surface of the tapping seat and the outer surface of the pipe is provided by a flexible, flat sealing element. This set of parts creates a so-called tapping strip on the pipe. In the upper portion of the tapping seat there is formed a boss in which a closure element is provided, for example a ball valve, a slide or a valve. More often, the boss is provided with a threaded bore into which the closure element is screwed. Sometimes, the seat is made without this boss at a point where a threaded bore is formed in the seat into which the threaded neck of the flange is screwed as a spacer for the closure element. The actual drilling with the boring machine is essentially the same for all designs. The tapping device is not screwed onto the tap or slide and the drill of the tapping tool is slid into the open by the closing element. The pipe is drilled under pressure and the closing element is closed after engagement of the drill. The tapping machine is removed, the house pipe connection is screwed to the thread of the closing element, which is pressurized to the desired water drainage when the closing element is opened. Sealing between the seat and the pipe at the tapping point is done with a flat elastic seal or a disc-shaped elastic seal with a neck and concentric circular projections. Some saddle designs are characterized by concentric semicircular grooves into which O-rings are inserted.

A disadvantage of the existing drilling saddle solutions of all structures is the geometric deviation resulting from the gripping of the tapping belt wrapping pipes, in particular plastic. The elastic seal is deformed unevenly by the pulling pressure because the pulling pressure is highest on the outer periphery and decreases toward the inner periphery of the seal at the point of bore, but with the greatest water pressure. In the circumscribed construction there is leakage, i.e. the extrusion of the elastic seal from the point of contact or the grooves of the seat. Uneven distribution of pressures will cause fatigue and seal life.

The essence of the technical solution

The above-mentioned drawbacks are eliminated by the tapping seat of the tapping belt, in particular for the tap of the water supply system consisting of a seat body provided with fastening tabs with holes for the clamping yoke and a boss with a hole for screwing the tap of the tapping device and the fixing bed of the sealing element opening its edge on the cylindrical bearing surface in which they are recesses formed concentrically around the bed. The essence of the solution is that

the end of the outer recesses passes into a form-raised edge to prevent leakage of the sealing elastic element, wherein the height of the shaped raised edge to prevent leakage of the sealing elastic element is equal to 1.1 to 2.75 times the height of the edge of the annular recess;

- the angle α of wrapping the inner edges of the fasteners is 160 ° to 170 °;

- the radius R _{p of the} cylindrical seat is equal to 1,004 to 1,007 times the actual outer radius of the drilled plastic pipe;

- the radius Rdp of the cylindrical curvature of the outer recesses is equal to 1.017 to 1.033 times the actual outer radius of the drilled plastic pipe.

The advantage of the tapping seat of the tapping belt, in particular for the tap of the water supply, is that, due to the appropriate structural modification of its seated cylindrical surface, undesired uneven deformation of the sealing element and uncontrolled displacement of its material from the pre-set position is avoided. By adjusting the shaped seating surface of the tapping seat by increasing its radius of curvature so that it reaches 1.01 to 1.04 times the nominal outer radius of the tapped water pipe and the shape of the circumferential portion of the recess, a high tightness of the connection is ensured, and this element reaches a uniform load on the sealing element. compared to the known state of the art of higher durability and operational reliability.

-3 Overview of drawings in the drawing

In the accompanying drawing, there is shown a tapping seat of the tapping belt, where Fig. 1 is a cross-sectional view of the seat and Fig. 2 is a longitudinal cross-sectional view of the seat.

An exemplary embodiment of a technical solution

In the exemplary embodiment, the tapping seat of the tapping strip, in particular for the tap water tap, is designed to consist of a metal (cast-iron) seat seat 1 of arcuate shape, the end portions of which pass into mounting brackets 2 in which holes 3 are provided for fastening the tightening stirrups. A riser 4 is provided on the central part of the body and the seat 5 with an opening 5 for screwing the closure element. The opening 5 for screwing the closure element by its widening forms a fixing bed 6 of the sealing elastic element, which edge extends on the cylindrical bearing surface 7 of the seat. The saddle seating surface 7 has two concentric shallow circular recesses 8 formed around the sealing elastic bearing bed 6, the outer outer recess 8 extending into the shaped edge 9 to prevent leakage of the sealing elastic element. The curvature of the cylindrical seat surface 7 of the seat is such that the actual radius R _{p of the} curvature of the surface is equal to 1.004 to 1.007 times the outer radius of the tapped pipe and the radius Rdp of the cylindrical curvature of the outer recesses 8 is 1.017 to 1.033 times the actual radius of the plastic pipe being drilled, thereby radius means half the nominal diameter of the drilled plastic pipe with the corresponding average tolerances. The height of the raised edge 9 to prevent leakage of the sealing element is equal to 1.1 to 2.75 times the height of the edge of the annular recess 8. The angle of wrap and the inner edges of the fastening tabs 2 on the drilled tube is at least 160 ° and at least the wrap angle on the sleeve , opposite part of the tapping belt.

The radii R _p , R d _P defined by this technical solution to the radius of the drilled, in particular plastic pipe, have their special meaning: the slight increase in Rp over the drilled pipe radius results in minimal deformation of the drilled pipe in the y-axis direction of the tapping belt and after clearance clearance. there is increased pressure in the x direction. By completing the tightening of the screw connection, the pressure on the elastic seal increases from the center of the bore to the outer edge of the seal, and therefore the tightening torque of the bolts already results in a perfect connection. When fastening and tightening the tapping seat with the clamp, the resilient sealing element is compressed between the pipe and the tapping seat, thereby elastically deforming it and compressing it to increase its surface dimension until it rests on the shaped edge 9 to prevent leakage of the sealing resilient element .

By increasing the radius of curvature of the cylindrical seating surface 7 of the seat compared to the nominal outer radius of the pipe, deformation of the flexible pipe is prevented, thereby increasing the tightness of the connection, especially for larger diameters of the tapped pipe.

Claims (4)

PROTECTION REQUIREMENTS A drilling seat of a tapping belt, in particular for a tap water pipe branch comprising a seat body provided with fastening clips with a clamping bore hole and a boss with a bore for screwing the tap of a tapping machine and a fixing bed of a sealing element recesses formed around this bed, characterized in that the outer of the outer recesses (8) merge into a raised edge (9) to prevent leakage of the sealing elastic element, wherein the height of the raised edge (9) to prevent leakage of the sealing elastic element is 1, 1 to 2.75 times the edge height of the circular recess (8). Drilling belt tapping seat according to claim 1, characterized in that the angle α of the inner edges of the fastening tabs (2) is equal to 160 ° to 170 °. Drilling belt tapping seat according to claims 1 and 2, characterized in that the radius R _{p of the} cylindrical bearing seat (7) is equal to 1.004 to 1.007 times the actual outer radius of the drilled plastic pipe. Drilling belt tapping seat according to claims 1 to 3, characterized in that the radius Rdp of the cylindrical curvature of the outer recesses (8) is equal to 1.017 to 1.033 times the actual outer radius of the drilled plastic pipe.