RU31428U1 - Device for connecting round flange elements - Google Patents

Abstract

1. A device for connecting round flange elements with a seal between them, mainly a cover with a valve body, comprising a tightening collar made of at least two half rings with a grooved trapezoidal cross section on concave surfaces corresponding to the covered profile of closed flange elements with the ability to pair with them only end conical surfaces, fasteners for tightening the clamp, characterized in that the angle of inclination of each of the mating conical surfaces in the profile grooves of the parts of the clamp is made in the range of 6-15 °, and the radius of curvature of the inner surface of the profile groove in each part of the clamp in its expanded position is greater than the radius of the outer surfaces of the edges connected to each other by the flange elements. 2. The device according to claim 1, characterized in that the washer as a fastener element mounted on a stud between the collar collar and the nut is made of two parts, the mating surface of one of them being spherical and the other aspherical.

Description

DEVICE FOR CONNECTING ROUND FLANGE

The inventive utility model relates to the field of engineering, to

devices for quick connection (disconnection) of round flanged elements of predominantly pipe fittings, nano-example for connecting the cover to the valve body.

A known connecting node of the pipeline with sealing ring (see application UK No. 2174 162, MKI 4 F16L23 / 04, NKIR2O, US patent). The assembly is made in the form of a collar of two half rings with a groove trapezoidal in cross section on concave surfaces, which ensures the tightening of two flanges. The front parts of the flanges form conical recesses for the metal sealing ring, the design of which ensures the integrity of the recesses at any magnitude of the compression force without exceeding the elastic and fluidity limits of the ring material.

Based on the operating conditions of the connecting unit, the material and design of the seal, the parts of the clamp have significant material consumption. Therefore, for significant DNs, for example, more than 800 mm. Such a design of the connection assembly could be unacceptable.

Another device for connecting pipes is known (see invention according to ed. St. USSR No. 347503 M. Cl F 16 L 23/00 of 08/05/1968). The device is made in the form of a coupling collar, consisting of two half rings with profiled trapezoidal in transverse cross-section by a groove on concave surfaces, which ensures the collapse of the collars (flanges) at the ends of the pipes and a tight seal of the connection due to deformation of the gasket 5 between the flanges.

The ends of the clamps are interconnected by means of hinged bolts 6,7 and through the pin 9, the bracket 11 with a pipe 3.

The disadvantage of this device is the complexity of the design of the device, which (complexity) is due to the connection of the clamp to the pipe through the bracket.

M. cl. 7 F 16L 23/04

ELEMENTS.

Of the known devices closest to the claimed object in technical essence and performed functions is the invention but author. St. USSR No. 347 503.

The objectives of the utility model are to create a device that is simple in design and reliable in operation for the quick connection of round flanged elements, for example, the valve body with the cover, which made it possible to quickly disassemble and assemble the valve in the pipeline in the field without dismantling it from the pipeline and subsequently repairing it.

The tasks are solved in that in the known device for connecting round flange elements with a seal between them, mainly a cover with a valve body containing a tightening collar made of at least two half rings with a grooved trapezoidal cross-section on concave surfaces corresponding to the male profile closed flange elements with the ability to pair with them only end conical surfaces and fasteners for tightening the clamp, the angle of each of mating conical surfaces in the profile grooves formed in the yoke parts nredelah 6-15 °, and the radius of curvature of the inner surface in every portion of the collar in decompressed position greater than the radius of the outer surface edges of the flange of interconnected elements.

The washer as a fastener element mounted on a hairpin between the collar collar and the nut is made of two parts, the mating surface of one of them made spherical and the other aspherical.

Performing an angle of inclination of each of the mating conical surfaces of less than 6 ° will bring it closer to the value of the angle of friction, which will make disassembling the device difficult due to possible jamming.

Performing an inclination angle of each of the mating conical surfaces of more than 15 ° will lead to a significant increase in the tensile force and ultimately to an increase in the diameter of the studs, dimensions and weight of the entire device. o The fulfillment of the radius of curvature of the inner surface in each part of the clamp in its unclamped position is greater than the radius of the outer surface of the edges of the interconnected flange elements that made it possible to uniformly tighten round flange elements of the body and the valve cover when pulling the clamp due to the elastic deformation of its parts. The implementation of the fastener element — a washer made up of two parts with mating surfaces — spherical and aspherical — allowed the studs to self-install during the clamping of the clamp and avoid bending deformation, i.e. achieve the work of the studs in pure tension. The following drawings illustrate, as an example, the implementation of the utility model “Device for connecting round flange elements, confirming the possibility of its industrial application using the totality of features in the utility model formula, where: In FIG. 1 - the device in the expanded position; FIG. 2-valve with a complete assembly; FIG. 3 - type I device with a fragment of the valve; FIG. 4 - also, view A; FIG. 5 is a schematic illustration of a fragment of a device with flanges; FIG. 6-section BB, a fragment of the device with a hairpin. A device for connecting round flange elements contains a tightening collar 1 made of two half rings (see Fig. 1) with a groove trapezoidal in cross section on their concave surfaces. The groove nofil corresponds to the covered profile of the closed flanges of the valve body 2 and the valve cover 3 (see Fig. 2,3 and is connected only with end conical surfaces. The fasteners used to tighten the clamp parts include studs 4, nuts 5 and washers 6, 7. Each of the connectors is closed by a box 8 in the form of a rectangular parallelepiped to protect the fasteners of mechanical damage and contamination.

Each box 8 is connected to the clamp 1 by means of a screw 9 and a strap 10 with a threaded hole.

The angle of inclination "a of each of the mating conical surfaces in the profile grooves of the parts of the hoops is made in the range of 6-15 ° (see Fig. 5)

Performing an inclination angle of less than 6 ° will bring it closer to a value equal to the angle of friction of metal pairs (flange and clamp), i.e. will lead to their jamming and complication of disassembly of the valve. Fulfillment of the angle of inclination а and more than 15 ° will lead to a significant increase in the tightening force, to an increase in the diameter of the studs and the mass of the entire device.

The radii of curvature of the inner surfaces of the profile groove in each part of the clamp 1 in its unclamped position are greater than the corresponding radii of the outer surfaces of the edges (see FIG. 5) of the flange elements of the housing and the cover interconnected.

The fulfillment of the radii of curvature of the inner surfaces in each part of the clamp 1 in its unclamped position, more than the radii of the outer surfaces of the edges of the interconnected flange elements, made it possible to more uniformly tighten the casing 2 and the valve cover 3 to each other when tightening the clamp 1.

The washer, as already mentioned above, is made of two parts 6, 7 and is located on the stud 4 between the collar collar and the nut 5. The mating surface of the washer 6 is made spherical, and the surface of the other washer 7 is aspherical (see Fig. 6).

The device operates as follows. The cover 3 is installed on the valve body 2, while the outer edges of the flanges are fully combined due to the protrusion on the cover 3 and the depression on the body 2 in the area of the sealing ring 11. Then put on the closed flanges parts of the clamp 1 - half rings with profiled trapezoidal grooves and tighten them studs 4.

When tightening the half rings of the clamp 1, they, covering with their profiled part the corresponding elements of the flanges of the housing and the cover, pull them together with great force, discouraging the reliability of the connection.

In FIG. 5, the diagram of the interaction of the clamp with flange elements shows the dependence of the forces Pfjj4- (normal), P (compresses them) and PR (radial), depending on the angle a, the angle of inclination of the conical surface of the profiled part of the clamp.

After tightening the clamp 1, install boxes 8 and fix them relative to the clamp 1 with screws 9 by means of strips 10.

Process. the compounds are carried out in the (55piarrM “t sequence.

The proposed device allowed to speed up and facilitate the assembly process of disassembly of valves DN 800-1200mm, PN 8.0 MPa (80 kg / cm) for the implementation of their repair in the field.

Authors: / LX: / Lemberg V.T.

Idolov A.V.

Claims (2)

1. A device for connecting round flange elements with a seal between them, mainly a cover with a valve body, comprising a tightening collar made of at least two half rings with a grooved trapezoidal cross section on concave surfaces corresponding to the covered profile of closed flange elements with the ability to pair with them only end conical surfaces, fasteners for tightening the clamp, characterized in that the angle of inclination of each of the mating conical surfaces in the profile grooves of the parts of the clamp is made in the range of 6-15 °, and the radius of curvature of the inner surface of the profile groove in each part of the clamp in its expanded position is greater than the radius of the outer surfaces of the edges connected to each other by the flange elements. 2. The device according to claim 1, characterized in that the washer as a fastener element mounted on a pin between the collar collar and the nut is made of two parts, the mating surface of one of them being spherical and the other aspherical.