RU2151850C1 - Radial support of face motor - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: invention refers to drilling hydraulic face motors, specifically, to their supporting units located in motor and spindle sections. In addition to customary bushings of frame and shaft given support has intermediate yoke coaxial to them and attached to one of bushings by means of intermediate restoring member mounted for elastic misalignment and radial displacement of yoke. In this case working pair of friction surfaces is formed by interacting surfaces of second bushing and yoke. Restoring member can come in the form of cylindrical spacer made of elastomer, elastomer rings or set of axially symmetric metal springs of radial action for use in high-temperature holes. Radial support can be fitted with safeguarding discs installed flush with one or both butts of bushing fastened to yoke which limit axial displacement of yoke. EFFECT: increased functional reliability, prolonged service life of radial support and imparting it with properties of effective slit sealing. 7 cl, 3 dwg

Description

 The invention relates to hydraulic downhole drilling motors, namely, to their support nodes located in the motor and spindle sections.

 A radial bearing of a downhole motor is known, including coaxial bushings of a housing and a shaft, an elastomer gasket located between them, fastened along its cylindrical surface to one of the bushings, and a working friction pair is formed by a second, free cylindrical surface of the gasket, and a second surface in contact with (adjacent) to it bushings (see, for example, Shumova Z.I., Sobkina I.V., Handbook on turbodrills, Moscow, Nedra, 1970, p. 35, fig. 22, positions 2 and 3).

 Radial bearings are also known in which channels for the passage of the working fluid are made (see ibid., Items 29 and 30).

 The disadvantage of these supports is their low reliability and relatively low permissible operating ambient temperatures.

 A radial bearing is also known, including metal bushings of the housing and shaft, in which the friction working pair is formed by the contacting cylindrical surfaces of these bushings (see, for example, the Navi-Drill advertising booklet, Fig. On page 6, the position "Improved radial bearing" - "Improved radial bearing" - prototype).

 The disadvantage of this support is the stiffness of the support, leading to increased, uneven, local wear during operation and even to the wedge when the shaft is skewed and deformed.

 The objective of the invention is to remedy these disadvantages, increase the reliability of the radial bearings, increase the allowable ambient temperatures, reduce, if necessary, the leakage of the working fluid in the gap of the working pair of friction.

 The problem is achieved in that in the radial support of the downhole motor, including the coaxial bushings of the housing and the shaft, a working pair of contact surfaces of friction between the bushings is installed intermediate, coaxial cage, fastened to one of the bushes by means of an intermediate elastic element with the possibility of elastic skew and radial displacement of the cage in the radial clearance between the cage and the sleeve, and the working pair of the friction of the support is formed by interacting, adjacent surfaces of rotation of the wallpaper we and the second sleeve.

 It is advisable that the elastic element is made of elastomer. As an embodiment, the elastomeric elastic element is expediently made in the form of a tubular cylindrical spacer, and its fastening with adjacent holder and sleeve is carried out by gluing, vulcanization or by means of a tight fit.

 As another embodiment, the elastomeric elastic element is expediently performed in the form of a set of elastomeric rings mounted with a tight fit in the annular grooves made in an adjacent sleeve or ferrule, ensuring their previously indicated fastening.

 At high operating ambient temperatures, it is advisable to perform an elastic element in the form of an axisymmetric set of metal springs, for example, a set of leaf springs fastened together.

 It is advisable to install a limiting disk in the radial support, the end of which is in contact with the end face of the sleeve fastened to the cage, and limits the possibility of axial movement of the cage beyond the axial dimension of the support.

 As an embodiment, it is advisable to install restrictive disks from both ends of the support, limiting the possibility of axial movement of the support with the axial dimension of the sleeve, fastened to the cage.

 In FIG. 1,2,3 shows longitudinal sections of various options for the proposed support.

 The support (Fig. 1) includes a housing sleeve 1, a shaft sleeve 2, a yoke 3 coaxial to it, and an elastic element 4 in the form of a tubular cylinder of elastomer located in this embodiment between the shaft sleeve 2 and the yoke 3. The elastic element 4 is fastened along its lateral surfaces rotation with the contacting surfaces 5 and 6, respectively, of the sleeve of the shaft 2 and the sleeve 3 and in this way fastens them together with the possibility of elastic radial displacement and skew of the sleeve 3 relative to the sleeve of the shaft 2 within the radial clearance δ between them. This fastening can be carried out, for example, by gluing, vulcanizing, or straining the elastic element 4 between the sleeve 1 and the holder 3. The necessary elasticity of the elastic element 4 is provided by varying its axial length, radial thickness and properties of the elastomer.

 The working pair of friction of the radial support is made up of the hardened surface of the second sleeve, namely the surface 7 of the shaft sleeve 2 and the adjacent free (internal) surface 8 of the cage 3.

 A variant of the support shown in FIG. 2, differs from the previous one in that the sleeve of the housing 1 is fastened to the clip 3, and the elastic element is made in the form of a set of elastomeric rings 9 installed in grooves made in the clip 3. The fastening of the clip 3 and the sleeve of the housing 1 is provided by gluing them to the rings 9 and / or a tight fit (compression in the radial direction) of the rings 9 in the gap (space) between the sleeve of the housing 1 and the holder 3. As an option, grooves for elastomeric rings 9 can be made not in the holder 3, but in the stator sleeve 1.

 In FIG. 3 shows a support in which the elastic element is made in the form of an axisymmetric set of metal springs 10 of radial action, i.e. springs that allow under the action of radial force and a skew moment an elastic radial displacement and misalignment of the cage in the support and its return to the coaxial position of the bushings in the absence of these force factors. The springs 10 can be fastened together by a cylindrical thin-walled cylinder 11 or made integral with it.

 The fastening of the cage 3 with the sleeve of the housing 1 is achieved by a tight fit (preliminary elastic deformation) of the springs 10 in the space between them. In addition, in the sleeve of the housing 1 and the holder 3 are made recesses, respectively 12 and 13, limiting the possibility of axial movement of the springs, and, consequently, the holder 3 relative to the sleeve 1.

 In addition to those indicated, springs of various configurations can be used in the support, for example, coil springs, the axis of the turns of which are perpendicular to the axis of the support and which are installed in recesses made in a sleeve or cage.

 In addition, a safety disk 14 is made in the support, the end of which contacts the end of the sleeve of the housing 1, fastened to the yoke 3, and by its protrusion 15 limits the possibility of axial movement of the yoke 3 in this direction. Bounding discs 14 may be provided on both sides of the support, as shown in FIG. 2.

 On one of the surfaces forming the working pair of friction, axisymmetric flushing grooves can be made, for example, (Fig. 3) grooves 16 on the working surface 7 of the shaft sleeve 2.

 If it is necessary to pass part or all of the working fluid through the support, bypass channels (not shown) are made in the sleeve (or sleeves) and / or clip. To accommodate them, the thickness of the corresponding parts increases.

 Thus, the proposed support is multivariant in terms of its specific constructive implementation. So, both the shaft sleeve (Fig. 1) and the body sleeve (Fig. 2 and 3) can be connected to the clip by means of an elastic element. In this case, the working pair of friction surfaces is formed by the side surface of the cage free from fastening and the surface of the second sleeve contacting with it. The elastic element can be recessed into grooves made in the cage (Fig. 2), in the sleeve (Fig. 1), or in both parts fastened by the elastic element (Fig. 3). The restriction rings 14 are installed end-to-end with a sleeve fastened to a ferrule, i.e. with housing sleeve or with shaft sleeve.

 The advantage of the proposed support is that, due to the presence of an elastic element in it, a load distribution is evenly distributed on the surface of the working pair of friction, which is especially important if there is even slight curvature of the shaft or its skew when drilling deviated wells under the influence of lateral force on the bit. This alignment of the load along the length of the working pair of the friction of the support increases its resistance, prevents local wear, local heating, emergency jamming ("adhesion") of the friction surfaces.

 Due to the cushioning action of the elastic element and the small mass of the casing, the transverse shock loads on the support from vibrations are significantly reduced, which helps to increase the resistance of the support.

 The presence of an elastic element in the support allows, if necessary, to significantly reduce the gap in the working pair of friction of the support, without fear of jamming it from skew, and thus give the support the function of an effective gap seal.

Claims (7)

 1. Radial support of the downhole motor, including two coaxial bushings, namely, the housing sleeve and the shaft sleeve, a working pair of friction contact surfaces, characterized in that a cage is mounted between the two bushings, attached to one of these two bushings by means of an intermediate elastic element with the possibility of skewing and radial displacement of the cage, and the working pair of contact surfaces of the friction of the support is formed by adjacent cylindrical surfaces of the other of these bushings and cage.  2. The radial support of the downhole motor according to claim 1, characterized in that the elastic element is made of elastomer.  3. The radial bearing of the downhole motor according to claim 2, characterized in that the elastic elastomeric element is made in the form of a tubular cylindrical spacer.  4. The radial support of the downhole motor according to claim 2, characterized in that the elastic element is made in the form of a set of elastomeric rings installed with a tight fit in the annular grooves made in a sleeve or ferrule.  5. The radial support of the downhole motor according to claim 1, characterized in that the elastic element is made in the form of an axisymmetric set of metal springs of radial action.  6. The radial support of the downhole motor according to any one of the preceding paragraphs, characterized in that it comprises a safety disk located end-to-end at its ends with a sleeve fastened with a cage, with the possibility of axial movement of the cage being limited by its annular protrusion.  7. The radial support of the downhole motor according to claim 6, characterized in that it contains a second safety disk, one end of which is located end-to-end with the second end of the sleeve fastened to the holder, with the possibility of axial movement of the holder to limit its annular protrusion.

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