CN102386693A

CN102386693A - Rubber interlayer metal stator screw

Info

Publication number: CN102386693A
Application number: CN201110262001XA
Authority: CN
Inventors: 祝效华; 石昌帅; 李佳南
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2011-09-06
Filing date: 2011-09-06
Publication date: 2012-03-21
Also published as: CN202210711U

Abstract

The invention relates to a rubber interlayer metal stator screw for petroleum and natural gas drilling. The technical scheme is that the rubber interlayer metal stator screw is composed of a stator shell, a rubber layer, a metal stator layer, a rotor and the like. The stator shell is a straight pipe with the smooth inner wall, the metal stator layer is formed by a plurality of half-lead or one-lead spiral pipelines through matching of splines and spline grooves, the stator shell is adhered to the metal stator layer through the rubber layer, and the rotor is meshed with the metal stator layer to form a sealing cavity. When the screw is in work, the rubber layer has the damping effect. The rubber interlayer metal stator screw has the advantages of being resistant to high temperature, large in torsion, short in length, long in service life, simple to process and the like, can further improve service life and working efficiency, reduces processing difficulty and processing cost of a screw drill stator with the equal wall thickness, and has significant engineering application value.

Description

A kind of channel rubber metal stator screw rod

Technical field

The present invention relates to the helicoid hydraulic motor used in a kind of oil, the gas drilling field, particularly a kind of channel rubber metal stator screw rod.

Background technology

Helicoid hydraulic motor is a mud motor commonly used in oil, the gas drilling engineering; It comprises by-pass valve assembly, motor assembly, universal drive shaft assembly and driving-shaft assembly; Wherein motor assembly is the core component that power is provided for helicoid hydraulic motor, is made up of rotor and two essential parts of stator.Conventional motor stator is made up of stator case and rubber bushing, and the stator case inner chamber is the smooth face of cylinder, and rubber is bonded in the stator case inwall through sulfuration process, and the endoporus of rubber bushing is the continuous helical curved surface.In the course of work, under the extruding and rotor annular seal space differential pressure action of rotor cycle property, because the rubber bushing wall thickness does not wait; Inhomogeneous deformation will take place in rubber bushing, thereby cause the rubber bushing mechanical sealing performance to weaken, and influence motor operations efficient; Simultaneously because the heat radiation of rubber bushing is uneven; Thermal hysteresis is serious, makes rubber very easily aging and tear, and reduces its useful life.

In recent years, proposed both at home and abroad to wait the wall thickness screw drilling tool motor stator, because the wall thickness of stator rubber lining is basic identical; The distortion of stressed back evenly; Resistance capacity to deformation is strong, and heat dispersion and sealing property improve, and has improved the operating efficiency and the useful life of helicoid hydraulic motor; But the same wall-thickness stator shell inner surface is the continuous helical curved surface, and difficulty of processing is big and cost is higher.Therefore, the research processing technology is simple, processing cost is lower, the helicoid hydraulic motor of high efficiency and long service life has important application value.

Summary of the invention

The objective of the invention is in order to solve conventional screw drilling tool stator inefficiency, useful life short, and etc. the difficult problem that wall thickness helicoid hydraulic motor stator difficulty of processing is big and cost is high, a kind of channel rubber metal stator screw rod is provided especially.

For achieving the above object; The present invention solves the technical scheme that this technical problem adopts: a kind of channel rubber metal stator screw rod; Form by stator case, rubber layer, metal stator layer and rotor etc.; Its architectural feature is: stator case is the straight tube of inner wall smooth, and the metal stator layer is that pipe fitting or the outer surface that wall thickness equates, surfaces externally and internally is spiral camber is that the smooth face of cylinder, inner surface are the pipe fitting of spiral camber; Rubber layer by sulfuration between stator case and the metal stator layer bonds together; Rotor and the engagement of metal stator layer form annular seal space; When screw rod was worked, rubber layer also played damping effect; Two end faces of each helix tube have 3～5 splines and spline respectively, and the helix tube of half helical pitch that processes or a helical pitch through spline and spline cooperation, is assembled into the metal stator layer.

The beneficial effect that the present invention has is: (1) this screw rod is inner to be the metal stator layer, has accelerated the radiating rate of stator, has improved the bearing capacity of stator intensity, annular seal space, and the operating efficiency of motor and useful life; (2) the metal stator layer is assembled into by the helix tube of a plurality of half helical pitch or a helical pitch; Has the common advantage that waits wall thickness helicoid hydraulic motor stator; Because the length of helix tube is shorter, therefore reduced the difficulty of processing and the processing cost of same wall-thickness stator inside spin curved surface simultaneously; (3) rubber layer is bonded between stator case and the metal stator layer, avoided because of with direct heat expansion, the swelling that causes that contact of drilling well medium, slowed down the speed that rubber mill undermines fatigue aging.

Description of drawings

Fig. 1 is a kind of channel rubber metal stator of the present invention screw rod first embodiment cross sectional representation.

Fig. 2 is a kind of channel rubber metal stator of the present invention screw rod second embodiment cross sectional representation.

Fig. 3 is a first embodiment of the invention screw profile sketch map.

Fig. 4 is a second embodiment of the invention screw profile sketch map.

Fig. 5 is a first embodiment of the invention helix tube generalized section.

Fig. 6 is a first embodiment of the invention helix tube generalized section.

Among the figure: 1. stator case, 2. rubber layer, 3. metal stator layer, 4. rotor, 5. helix tube, 6. spline, 7. spline.

Embodiment

Like Fig. 1, Fig. 3 and shown in Figure 5; A kind of channel rubber metal stator of the present invention screw rod first embodiment; Form by stator case 1, rubber layer 2, metal stator layer 3 and rotor 4 etc.; Its architectural feature is: stator case 1 is the straight tube of inner wall smooth, and metal stator layer 3 is wall thickness equates, surfaces externally and internally is spiral camber pipe fitting; Rubber layer 2 by sulfuration between stator case 1 and the metal stator layer 3 bonds together; Rotor 4 forms annular seal space with 3 engagement of metal stator layer; Rubber layer 2 bonds with the external helicoid curved surface of metal stator layer 3; Increased adhesion strength; Rubber layer 2 is bonded between stator case 1 and the metal stator layer 3, avoided because of with direct heat expansion, the swelling that causes that contact of drilling well medium, slowed down the speed that rubber mill undermines fatigue aging; When screw rod was worked, rubber layer 2 also played damping effect; Helix tube 5 surfaces externally and internallies are spiral camber, and 5 two end faces of each helix tube have 3～5 splines 6 and spline 7 respectively, and the helix tube 5 of half helical pitch that processes or a helical pitch is cooperated through spline 6 and spline 7, are assembled into metal stator layer 3.

Like Fig. 2, Fig. 4 and shown in Figure 6; A kind of channel rubber metal stator of the present invention screw rod second embodiment; Also form by stator case 1, rubber layer 2, metal stator layer 3 and rotor 4 etc.; Its architectural feature is: metal stator layer 3 is that the smooth face of cylinder, inner surface are the pipe fitting of spiral camber for outer surface, is that the smooth face of cylinder, inner surface are that the helix tube 5 of spiral camber cooperates through spline 6 and spline 7 and forms by outer surface.

The metal stator layer 3 of first embodiment and second embodiment all has the advantage of wall thickness helicoid hydraulic motor stator such as common; Can accelerate the radiating rate of stator; Improve the bearing capacity of stator intensity, annular seal space; And the operating efficiency of motor and useful life, because metal stator layer 3 is made up of the short helix tube 5 of length, therefore reduced the difficulty of processing and the processing cost of same wall-thickness stator inside spin curved surface simultaneously.

Claims

1. channel rubber metal stator screw rod; Form by stator case (1), rubber layer (2), metal stator layer (3) and rotor (4) etc.; It is characterized in that: stator case (1) is the straight tube of inner wall smooth, and metal stator layer (3) is that the smooth face of cylinder, inner surface are the pipe fitting of spiral camber for pipe fitting or the outer surface that wall thickness equates, surfaces externally and internally is spiral camber; Rubber layer (2) by sulfuration between stator case (1) and the metal stator layer (3) bonds together; Rotor (4) forms annular seal space with metal stator layer (3) engagement.

2. a kind of channel rubber metal stator screw rod according to claim 1; It is characterized in that: (5) two end faces of each helix tube have 3～5 splines (6) and spline (7) respectively; The helix tube (5) of half helical pitch that processes or a helical pitch is cooperated through spline (6) and spline (7), be assembled into metal stator layer (3).