SU1372116A1 - Threaded joint - Google Patents

Abstract

The invention relates to the field of mechanical engineering and can be used as a detachable connection of parts and assemblies of mechanisms, apparatus, working under conditions of rendering a corrosive environment. The aim of the invention is to reduce labor costs during disassembly and saving of fasteners during the repair of equipment operating under the influence of an aggressive environment. The threaded connection includes a stud 1 and two nuts 2 and 3. The hole in one of the nuts 2 (internal thread diameter) is larger than the outer diameter of the thread of the stud 1, and the gap between the thread of the stud 1 and the surface of the nut 2 is filled with compacted solid particles 5. The nut can be performed with means of increasing the maximum allowable unscrewing moment. The goal is achieved by eliminating the sticking of the threaded surface of the stud I to the corresponding surface of the nut 2. 2 Cp. TO/)

Description

Bs :: Gg22; / 2 /// Lou

:about

Yu

JZZZZZZZ2ZZZZ

1137

The invention relates to mechanical engineering, in particular to threaded connections, and can be used in general and marine engineering to connect parts and assemblies, mechanisms and apparatus operating under the influence of an aggressive environment.

The purpose of the invention is to reduce labor costs during disassembly and to save fasteners when repairing equipment operated under the influence of an aggressive environment.

Fig, 1 shows a threaded connection, a general view; figure 2 is the same, top view; FIG. 3 is a section A-A in FIG. 1; Fig, 4 - threaded connection, in which the nut is made with longitudinal grooves on the inner surface, a view in plan; in FIG. 5, the same in which radially directed plates are placed in the longitudinal grooves, a plan view.

The threaded connection contains connectable parts — a stud 1, a nut 2, the diameter of a threaded hole in which (internal thread diameter) exceeds the outer diameter of the thread of stud 1, a standard nut 3 and a washer 4. The gap between the thread of the stud 1 and the inner surface of the nut 2 is filled solid particles 5 of arbitrary shape. For example, crushed metal waste (shavings and t, n, with a maximum size of 0.8-1.2 of the height of the original triangle can be used -: stud threads). The gap between the protrusions of the nut and stud threads should be at least 2 mm. In order to provide the possibility of increasing the maximum allowable torque applied to a nonstandard nut (Fig 4), at least two longitudinal grooves 6 are made on its threaded surface along its entire length and with an optimum depth of 1.1. -1.5 the height of the protrusions of the thread profile. Installation in the grooves 6 of the plates 7 additionally increases the maximum allowable torque applied to the non-standard nut (FIG. 5). The plates are installed so that the radial clearance between the plate and the thread of the stud is 0.2-0.3 the height of the thread profile of the stud,

Before assembling the threaded joint, the gap between the threaded rod and the surface of the nut is filled with metal particles of arbitrary shape.

62

with the specified maximum size. For tighter filling of the gap, the nut is tapped and the metal particles are compacted with the tool. introduced through the gap between the thread of the nut and the stud. A thin metal plate can be used as a tool. In this operation, metal particles are deformed to prevent them from falling out of the joint, and their mutual adhesion is enhanced. After filling the gap with solid particles and sealing them, the connection between the nut and the stud is ensured so that they can be relatively displaced. By selecting the size and mechanical characteristics of solid particles, it is possible to ensure the strength of the threaded joint, which is not inferior to that of standard joints. The nature of the placement of solid particles in the gap and the possibility of their displacement two relative to each other result in the disassembly of the joint operating under the influence of an aggressive environment, the possible adhesion of the solid particles to the surface of the stud and nut disrupted. In this case, the latter can be screwed with a standard tool.

A nut with a pin is inserted into the holes in the parts to be joined, a standard nut is screwed onto the free end of the pin and the connection is tightened. In order to ensure the strength of the joint, which corresponds to the specified value for standard joints, the mechanical characteristics of the material of solid particles placed in the gap between the nut and stud should exceed the corresponding characteristics of the material of the nut by 1.5-2 times.

When disassembling the joint, begin with a non-standard nut. When the moment is applied to loosen the nut due to the possibility of solid particles relative to each other, their adhesion to the threaded surface is broken. After that, the threaded connection can be disassembled with a standard tool.

The presence of gaps between solid particles allows preservatives to be added to the compound, surface-active

one

Oily substances with the minimum necessary consumption.

The proposed technical solution has the following advantages in comparison with the known one: reduction of labor costs when disassembling connections operated in aggressive environments; reducing fastener consumption and damage during repairs of equipment, improving the conditions for supplying preservatives and surfactants to threaded surfaces during operation; locking the threaded joint when using a research institute of solid particles with sharp edges.

Claims (3)

1. A threaded connection containing a pin located in the holes of the parts to be joined and two nuts mounted on its ends, characterized in that, in order to reduce labor costs during disassembly and 25 Jq t5 20 25 16 4 saving fasteners when repairing equipment operated in the field of corrosive environments, the inner diameter of the threaded hole of one of the nuts is greater than the outer diameter of the threaded portion of the stud, and the gap between the threaded stud and the inner surface of the nut is filled with compacted solid particles. 2, a compound according to claim 1, characterized in that at least two longitudinal grooves are made on the inner surface of the nut along its entire length, the depth of which exceeds the height of the protrusions of the thread. 3. A compound according to claim 1, about tl, which is because in the recesses on the inner surface of the nut there are solid radially directed plates, and the radial clearance between each plate and the outer diameter of the poultry thread is 0.2-0.3 the height of the profile specified thread. FIG. 2 fig.Z