RU2225944C1 - Device for assembling multisection gerotor mechanisms of screw hydraulic machines - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: invention relates to manufacture of gerotor mechanisms, namely, to devices for orientated assembling of rotor and stator modules of said mechanisms. Movable bushing with outer screw surface is made for axial displacement and disconnection from rod. At least one longitudinal and one cross notches are made on outer surface of rod. Each bushing with inner screw surface is made in form of separate module. At least one longitudinal notch is made on one of bushings with inner screw surface, and on other bushing with inner screw surface longitudinal notches are made equally spaced over circumference, whose number is equal to number of starts or rotor screw surfaces. Invention improved manufacturability of device, its reliability and increases service life. Provision is made for creating constructions with inner diameters of connecting elements of stators not limited by outer diameters of device bushings owing to exclusion of rigid coupling between bushings and provision of fixed adjustment of device. EFFECT: reduced cost owing to simplification of design. 3 cl, 9 dwg

Description

The invention relates to techniques for the manufacture of gerotor mechanisms of screw hydraulic machines, and in particular to devices for the oriented assembly of rotor modules and stators of multi-section gerotor mechanisms.

A device for the oriented assembly of multi-section stators of screw pumps, comprising a core with external screw surfaces similar to the internal screw surfaces of the assembled stators [1]. The stators are assembled by installing them on the core, followed by welding of the sub, assembled with the threaded ends of the modules to be joined. A disadvantage of the known design is that it excludes the possibility of assembling stators through threaded sub without a weld, which significantly reduces the strength of the gerotor mechanism, its reliability, durability and maintainability. In addition, the use of such a device limits the choice of materials embedded in the design of a multi-section stator to high weldability, which significantly reduces the possibility of using materials with mechanical properties necessary for operation under harsh conditions.

Another disadvantage of this design is the impossibility of its application for the assembly of multi-section rotors, which limits the length of the multi-section gerotor mechanism due to the complexity of manufacturing integral long rotors.

Closest to the claimed invention is a device for oriented assembly of the working bodies of a downhole motor, comprising mounting elements, each of which is made in the form of two bushings connected by a coupler with screw surfaces, while one of the bushings is rigidly connected to the coupler, and the other has the ability to rotate around its axis. Each of the mounting elements is equipped with a disk with a stopper, and the end surfaces of the disk and the movable sleeve have radial notches equally spaced from each other, the number of which is equal to the number of visits of the profile surface of the mounting element [2].

A disadvantage of the known design is the low manufacturability of the assembly of multi-section working bodies, due to:

- the presence of couplers 3 and 17 connecting the bushings 1, 2 and 15, 16, respectively (see Figs. 1, 3), requiring installation and removal of the device to conduct the mounting element through the entire screw surface of one of the assembled rotors or stators, which can lead to damage to the screw surfaces of these modules, jamming of the mounting element, deformations of its profile screw surfaces;

- the presence of the tuning discs 11 and 22 (see figures 1, 3), which requires checking the settings of the device before each use by installing it on the corresponding element (rotor or stator) of the gerotor mechanism (see figures 5 and 6);

- a fixed distance between the bushings, which, when assembling the stators, complicates the assessment of the coincidence of the patterns and requires additional lighting, since the movable sleeve and the tuning disk are located inside one of the assembled stators, at a considerable distance from the end of the stator (see Fig. 8).

In addition, due to the fact that the movable sleeve 16 of the mounting element for assembling the stators cannot be removed from the coupler 17 (see FIG. 3), the inner diameter of the sub 43 must be larger than the outer diameter of the screw surfaces 24 of the bushings 15 and 16 (see Fig. 8), which leads to a decrease in the strength of threaded connections 44 and 45, and in some cases when the inner diameter of the sub cannot be increased due to the low margin of safety, making it impossible to create a multi-section gerotor mechanism.

The technical problem to which the claimed invention is directed is to increase the manufacturability of the process of oriented assembly of multi-section rotors and stators, increase the reliability and life of multi-section gerotor mechanisms of screw hydraulic machines, provide the possibility of creating designs of multi-section gerotor mechanisms with internal diameters of the connecting elements (sub) of stators, not limited the outer diameters of the bushings of the device, due to the exclusion of a rigid connection between the bushings s device working bodies oriented assembly and at the expense of the preset devices.

Another technical problem, the solution of which the claimed invention is directed, is to reduce the cost of the device for the oriented assembly of working bodies by simplifying its design.

The essence of the technical solution lies in the fact that in the device for assembling multi-section gerotor mechanisms of screw hydraulic machines, including two bushings, each of which is made with an internal screw surface identical to the helical surfaces of the rotors of the hydraulic machine, as well as a movable and fixed sleeve, each of which is made with an external the screw surface, identical to the helical surfaces of the stators of the hydraulic machine, the fixed sleeve is rigidly fastened to the rod, and the movable sleeve is mounted on the rod with the possibility rotation around the axis of the rod, radial risks equally spaced from each other are applied to the end of the movable sleeve, the number of which is equal to the number of visits of the screw surfaces of the stators of the hydraulic machine, according to the invention, the movable sleeve is made with the possibility of axial movement and separation with the rod, at least on the outer surface of the rod at least one longitudinal and one transverse risk, each of the bushings with an internal helical surface is made as a separate module, on one of the bushings with an internal screw at least one longitudinal risk is applied on the surface, and on the other sleeve with an internal helical surface there are longitudinal risks equidistant from each other in a circle, the number of which is equal to the number of visits of the helical surfaces of the hydraulic machine rotors.

In addition, the outer and inner screw surfaces of the bushings can be made of an elastic material, for example polyurethane.

In addition, the length of the rod is determined by the expression L≥ l ₁ + l ₂ + l ₃ + l ₄ , where l ₁ is the distance from the butt end of the stator of the hydraulic machine to the beginning of the screw surfaces, l ₂ is the distance between the butt ends of the stators of the hydraulic machine, l ₃ is the length one of the stators of the hydraulic machine, l ₄ - the protrusion of the rod beyond the end face of the stator of the hydraulic machine.

The implementation of the device for assembling multi-section gerotor mechanisms in such a way that a movable sleeve with an external helical surface has the ability to move freely along the rod having longitudinal and transverse risks, and can be disconnected from the rod, and each of the bushings with an internal screw surface is made as a separate module, on one of which the longitudinal risk is applied, on the other - longitudinal risks equidistant from each other in a circle, the number of which is equal to the number of visits of screw surfaces hydraulic machine rotors, allows:

- to exclude the operation of checking the device settings before assembling a multi-section gerotor mechanism due to the exclusion of tuning discs from the design, which ensures a fixed device setting for this gerotor mechanism;

- to ensure the convenience of work when assembling a multi-section gerotor mechanism and to minimize orientation errors due to simplification of the design, removal of the marking of the rod and the end of the movable sleeve in a free zone for viewing;

- to provide the possibility of manufacturing multi-section stators with sub, having an inner diameter smaller than the largest diameter of the bushings with outer screw surfaces, by eliminating the rigid connection between the movable and fixed bushings.

The implementation of the outer and inner screw surfaces of the bushings from an elastic material, such as polyurethane, can significantly reduce the cost of manufacturing the device by eliminating the expensive machining of screw profiles, eliminates damage to the working surfaces of the gerotor mechanism, and also reduces orientation errors during assembly due to that polyurethane is practically not subject to shrinkage after polymerization.

The length of the rod, as determined by the above expression, ensures that the marking of the rod and the end of the movable sleeve is taken out of the area free for viewing.

Below is one of the design options for a device for oriented assembly of the working bodies of a multi-section gerotor mechanism.

Figure 1 shows a pair of bushings with external helical surfaces mounted on a rod intended for oriented assembly of stators.

Figure 2 presents a pair of bushings with internal helical surfaces, designed for oriented assembly of rotors.

Figure 3 shows a view A of figure 1 from the end face of the movable sleeve.

Figure 4 shows a view B in figure 2 from the side of the end face of one of the bushings with an internal helical surface and longitudinal risks equidistant along the circumference, the number of which is equal to the number of visits of the helical surface of the sleeve.

Figure 5 presents a diagram of the layout of the rod with the application of several transverse and one longitudinal notch.

Figure 6 presents the layout of the layout of the sleeve with internal helical surfaces with the application of longitudinal marks.

Figure 7 shows the assembly of two stators using a pair of bushings with external screw surfaces.

On Fig shows a view In figure 7 from the end face of the movable sleeve.

Figure 9 shows the assembly of two rotors using a pair of bushings with internal helical surfaces.

A device for assembling multi-section gerotor mechanisms of screw hydraulic machines (see Figs. 1 and 2) contains two bushings 1 and 2 with shafts 3 and 4, respectively, on which outer screw surfaces 5 are formed (see Fig. 1), and two bushings 6 and 7 with plates 8 on which internal screw surfaces 9 are formed (see FIG. 2).

The screw surfaces 5 (see FIG. 1) are identical to the screw surfaces of the abutting stators of the hydraulic machine, and the screw surfaces 9 (see FIG. 2) are identical to the helical surfaces of the abutting rotors of the hydraulic machine.

The fixed sleeve 1 is rigidly fixed (for example, by welding) to the rod 10, and the movable sleeve 2 is mounted on the rod 10 with the possibility of free movement along its axis and with the possibility of separation (removal) from the rod 10 (see figure 1). The rod 10 has a marking in the form of one longitudinal risk 11 and several transverse notches 12. The distance 13 between any adjacent risks 12 is equal to the axial step 14 of the outer screw surfaces 5 of the shafts 3 and 4 (see figure 1).

The number of notches 11 can be more than one, but should not exceed the number of visits of screw surfaces 5, and the angle between the risks 11 in this case should be a multiple of the angle defined by the expression 2π / z ₁ , where z ₁ is the number of visits of screw surfaces 5.

The shaft 3, made of an elastic material, for example polyurethane, is mounted on the mandrel 15 (see figure 1) and is fixed:

- from rotation with a key 16;

- from axial displacement by a flange 17, tightened along the thread 18 through the spacer 19.

The size t of the spacer 19 is selected so as to ensure a snug fit between the ends of the shaft 3 to the ends of the mandrel 15 and the flange 17 and at the same time prevent the deformation of the elastic material.

The shaft 4 is molded by pouring an elastic material, such as polyurethane, with adhesion to the sleeve 20 (see figure 1) and is additionally fixed:

- from turning by a longitudinal groove 21 made in the sleeve 20;

- from axial displacement by mandrel 22, tightened along thread 23 through spacer 24.

The size t _{1 of the} spacer 24 is selected so as to ensure a tight fit of the shaft end 4 to the end face of the mandrel 22 and at the same time to prevent deformation of the elastic material.

At the end 25 of the movable sleeve 2 (see Fig. 3), radial risks 26 are equidistant from each other, the number of which is equal to the number of visits of the screw surfaces 5.

The plates 8 are formed by pouring an elastic material, for example, polyurethane, with adhesion to the shells 27 (see figure 2) and are additionally fixed:

- from rotation by a longitudinal groove 28 (see figure 4);

- from axial displacement by an annular groove 29 (see figure 2).

The sleeve 6 has a marking of the outer surface in the form of longitudinal grooves 30 equidistant from each other in a circle, the number of which is equal to the number of visits of the screw surfaces 9 (see figure 2 and 4). The sleeve 7 has a marking of the outer surface in the form of a single longitudinal risk 31 (see figure 2).

The number of notches 31 can be more than one, but should not exceed the number of calls of screw surfaces 9, and the angle between the risks 31 in this case should be a multiple of the angle defined by the expression 2π / z ₂ , where z ₂ is the number of calls of screw surfaces 9.

The marking of the rod 10 is made in the following order (see figure 5):

- the sleeve 1 with the rod 10 and the sleeve 2 are installed in the stator 32 having an inner screw surface 33, identical to the screw surfaces 5 of the bushings 1 and 2, while the screw surface 5 of the sleeve 2 will be a continuation of the screw surface 5 of the sleeve 1;

- a longitudinal risk 11 is applied, which coincides with any of the patterns 26 printed on the end face 25 of the sleeve 2;

- at a distance of 34, a multiple of the axial step 14 of the screw surfaces 5 and measured from the end face 25 of the sleeve 2, the transverse risk 12 closest to the end face of the rod 10 is applied;

- with a step 13 equal to the axial step 14 of the screw surfaces 5, a number of transverse patterns 12 are applied, the number of which is arbitrary.

The marking of the sleeves 6 and 7 is made in the following order (see Fig.6):

- sleeves 6 and 7 are mounted on the rotor 35 having an outer screw surface 36, identical to the screw surfaces 9 of the sleeves 6 and 7, are closed until they fit snugly at the ends, while the screw surface 9 of the sleeve 7 will be a continuation of the helical surface 9 of the sleeve 6;

- a longitudinal risk 31 is applied to the outer surface of the sleeve 7, coinciding with any of the patterns 30 applied to the outer surface of the sleeve 6.

After marking, the device for assembling multi-section gerotor mechanisms of screw hydraulic machines has a fixed setting and is ready for use.

For the oriented assembly of stators 37 and 38 (see Fig. 7), the stationary sleeve 1 with the rod 10 is installed in the stator 37 so that after the assembly of the stators, l _{4 of the} rod 10 protrude beyond the end face of the stator 38. With the stator 37 along the thread 39 with a given torque the adapter 40 is connected by the moment. A movable sleeve 2 is installed in the stator 38 so that its end 25 protrudes beyond the end of the stator 38. The stator 38 with the movable sleeve 2 is connected by thread 41 to the adapter 40 until the ends touch.

The threaded connection 41 is tightened with a given torque, and the orientation of the screw surfaces 42 of the abutting stators 37 and 38 is judged by the coincidence of the end face 25 of the movable sleeve 2 with any of the transverse notches 12 and by the coincidence of any of the radial notches 26 with the longitudinal notch 11 (see Fig. .7 and 8).

For guaranteed removal of the marking elements (marks) of the rod 10 and the end face 25 of the movable sleeve 2 into the area free for viewing, the length of the rod 10 when designing the device is determined by the expression L≥l ₁ + l ₂ + l ₃ + l ₄ (see Fig. 7) .

For the oriented assembly of rotors 43 and 44 (see Fig. 9), sleeve 6 is mounted on rotor 43, and sleeve 7 is mounted on rotor 44 so that the ends of bushings 6 and 7 close after screwing. The adapter 46 is connected to the rotor 43 through the thread 45 with a given torque. The rotor 44 with the sleeve 7 along the thread 47 is connected to the adapter 46. The threaded connection 47 is tightened with a given torque, and the risks of 31 bushings match the orientation of the screw surfaces 48 of the joined rotors. 7 with any of the figures 30 of the sleeve 6, while the ends of the bushings 6 and 7 should fit snugly against each other.

Similarly, multisection gerotor mechanisms of screw hydraulic machines are assembled, containing more than two modules of rotors and stators, while the outer and inner screw surfaces of each subsequent module are a continuation of the outer and inner surfaces of the previous module, respectively.

Sources of information

1. US patent 3982858, CL. F 04 C 1/06, 09/28/1976.

2. SU, ed. testimonial. 1192432, cl. E 21 B 4/00, 07/07/1989 - prototype.

Claims (3)

1. A device for assembling multi-section gerotor mechanisms of screw hydraulic machines, including two bushings, each of which is made with an internal screw surface identical to the helical surfaces of the rotors of the hydraulic machine, as well as a movable and fixed sleeve, each of which is made with an external screw surface identical to the helical surfaces of the stators hydraulic machines, the fixed sleeve is rigidly fixed to the rod, and the movable sleeve is mounted on the rod with the possibility of rotation around the axis of the rod, at the end it is movable Sleeve applied equally spaced apart radial risks, the number of which equals the number of entries helical surfaces stators hydraulic machine, characterized in that the sliding sleeve is adapted for axial displacement and disengagement from the bar, on the outer surface of the rod coated with at least one longitudinal and one transverse risks, each of the bushings with an internal screw surface is made as a separate module, at least one longitudinally applied on one of the bushings with an internal screw surface I risk and on the other sleeve with internal helical surface applied longitudinal risks equidistant from each other circumferentially, the number of which equals the number of entries helical surfaces hydraulic machine rotors. 2. A device for assembling multi-section gerotor mechanisms of the screw hydraulic machines according to Claim. 1, characterized in that the inner and outer helical surfaces of the sleeves are made of elastic material such as polyurethane. 3. A device for assembling multi-section gerotor mechanisms of the screw hydraulic machines according to claim 1, characterized in that the length of the rod is defined by the expression L≥l ₁ + l ₂ + l ₃ + l _4, l ₁ where -. Away from the abutting end face of the stator prior to the screw hydraulic machine surfaces, l ₂ - the distance between the butt ends of the stators of the hydraulic machine, l ₃ - the length of one of the stators of the hydraulic machine, l ₄ - the protrusion of the rod beyond the end of the stator of the hydraulic machine.

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