CN216000313U - Oil shield fastening device for bearing box - Google Patents

Abstract

The utility model discloses an oil baffle fastening device for a bearing box, which comprises a detachable top fixing device, an axial oil return groove and a ball jacking screw, wherein the axial oil return groove and the ball jacking screw are arranged on the split surface of a lower bearing box; the bearing box upper cover and the upper oil sealing sheet are fixedly connected by the detachable top fixing device. The joint surfaces of the upper cover of the bearing box and the lower bearing box are respectively provided with a ball jacking screw, and the ball of the ball jacking screw is positioned in the axial oil return groove on the lower bearing box and can move along the axial oil return groove; the split surfaces of the upper cover of the bearing box and the lower bearing box are fixedly connected through two groups of fastening screws. According to the utility model, the traditional connection mode of the oil seal sheet in the bearing box and the upper cover of the bearing box is changed, so that the process sequence for disassembling the bearing box is changed, and the maintenance and disassembly work of the bearing box and parts thereof is completed under the condition of not disassembling the auxiliary process pipeline, thereby avoiding the damage of elements such as flange fasteners, gaskets and the like caused by repeated disassembly and assembly of the auxiliary process pipeline, and saving the spare part cost and the labor cost.

Description

Oil shield fastening device for bearing box

Technical Field

The utility model belongs to the field of machinery manufacturing in the petrochemical industry, and particularly relates to an oil baffle fastening device for a bearing box.

Background

In a matched centrifugal compressor in the field of mechanical manufacturing in the petrochemical industry, a bearing box is locked on the end face of a machine shell 1 through bolts, an upper oil sealing sheet 5 in the bearing box is fastened on an upper cover 7 of the bearing box through two large slotted column head screws 6 arranged on two sides, and the structural principle is shown in figures 1-3. When daily maintenance is carried out on a bearing part of a compressor or dry gas seal, the lower bearing box 4 is fixed on the shell 1 as a rotor supporting part, and the maintenance work of the inner part of the bearing box can be completed only after the upper cover 7 of the bearing box is disassembled and assembled. When the structure mode is disassembled, all (one or more) auxiliary process pipelines 2 arranged above the bearing box are usually disassembled firstly, and the upper cover 7 of the bearing box can be vertically lifted to realize the disassembly after the auxiliary process pipelines 2 are necessary plugged; after the maintenance work is finished, the upper cover 7 of the bearing box is vertically lifted on the bearing box, and the detached auxiliary process pipeline 2 can be installed after the re-installation is finished and the connecting piece is fastened. If the auxiliary process pipeline has special requirements, the auxiliary process pipeline is required to be cleaned correspondingly.

In the above manner, the work of disassembling and assembling the auxiliary process pipe almost accounts for half of the disassembling and assembling work, and repeated disassembling and assembling of the auxiliary process pipe often causes damage to the fastening members, the sealing members and other elements on the pipe, which becomes a cost of maintenance work. Secondly, in the dismounting process, some auxiliary process pipelines have special process media, the process media are required to be isolated and replaced when the system is dismounted, and the auxiliary process pipelines are required to be replaced by gas when the system is restored; in addition, the auxiliary process piping may be contaminated during the disassembly process. If the auxiliary process piping requires a cleaning process such as degreasing, the workload and cost are greater.

Disclosure of Invention

The utility model aims to solve the problems of pipeline pollution, large workload and high component damage cost of an auxiliary process system in the process of daily maintenance, disassembly and assembly of an upper cover of a bearing box for a bearing and dry gas seal due to the structural design of a compressor.

An oil retainer fastening device for a bearing box comprises a detachable top fixing device, two axial oil return grooves arranged on the split surface of a lower bearing box and at least four ball jacking screws; the detachable top fixing device is used for fixedly connecting the top of the upper cover of the bearing box with the upper oil sealing sheet, at least two ball jacking screws are respectively installed on two end faces, connected with the upper cover of the bearing box and the lower bearing box, of the upper cover of the bearing box, balls of the ball jacking screws are located in the axial oil return grooves and can move along the axial oil return grooves, the upper cover of the bearing box can be driven to move upwards to be separated from the lower bearing box when the ball jacking screws are jacked, and the upper bearing box and the lower bearing box are attached in a split mode when the ball jacking screws are loosened; the split surfaces of the upper cover of the bearing box and the lower bearing box are fixedly connected through two groups of fastening screws.

Furthermore, the structure of the detachable top fixing device comprises a threaded hole arranged at the top of the upper oil seal piece, a positioning screw rod, a threaded through hole arranged at the top of the upper cover of the bearing box and a concave screwed plug; the center of the threaded through hole at the top of the upper cover of the bearing box corresponds to the center of the threaded hole of the upper oil sealing sheet up and down; the positioning screw penetrates through the threaded through hole of the upper bearing box and then is in threaded connection with the threaded hole of the upper oil sealing sheet, the concave screw plug is fixed on the threaded through hole, and the upper end of the positioning screw extends into the concave hole of the concave screw plug, so that the upper cover of the bearing box and the upper oil sealing sheet are fixed relatively.

Furthermore, two ball jacking screws are respectively installed on the middle split surfaces of two sides of the upper cover of the bearing box and the lower bearing box which are connected.

Furthermore, the outer edge of the upper oil seal piece is embedded into an oil seal piece positioning groove formed in the inner wall of the upper bearing box, and the axial positioning of the upper oil seal piece is realized.

Furthermore, the diameter of the positioning screw is smaller than the thickness of the oil applying sealing piece, and the thickness of the oil applying sealing piece is larger than or equal to 6 mm.

Furthermore, the positioning screw is higher than the top of the threaded through hole on the upper bearing box, and the height value of the height is 15 mm.

Furthermore, a combined gasket is padded between the concave screw plug and the upper cover of the bearing box.

Furthermore, a lifting ring is installed at the top of the upper cover of the bearing box.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model changes the connecting mode of the oil seal sheet and the upper cover of the bearing box in the traditional bearing box, changes the process sequence of assembling and disassembling the bearing box, realizes the maintenance work of the bearing box and the inner parts thereof under the condition of not disassembling the pipeline of the auxiliary process system of the centrifugal compressor, thereby avoiding the damage of the pipeline flange fastener, the gasket and other elements caused by repeatedly assembling and disassembling the pipeline of the auxiliary connecting system of the compressor, and saving the cost of spare parts of the process gas circuit. Meanwhile, pollution in the pipeline dismounting process is avoided, and cleaning work before replacement and reinstallation for certain special medium gas pipelines is avoided. The bearing box assembling and disassembling and installing period is greatly shortened, the on-site maintenance efficiency is improved, and the bearing box assembling and disassembling device is convenient and fast.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure.

FIG. 1 is a schematic view of an assembly of an upper cover and an upper oil seal of a bearing housing in a conventional centrifugal compressor;

fig. 2 is a schematic view of the mounting of the upper oil seal, wherein (a) is a schematic view of the mounting of the upper oil seal shown in the direction of a-a in fig. 1; (b) is a partial enlarged view of (a).

FIG. 3 is a schematic structural view of an oil deflector fastening device for a bearing housing according to the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 4 taken along line A-A;

FIG. 5 is a schematic view (top view) of an oil return groove formed on a facet in the lower bearing housing;

FIG. 6 is a schematic view of the installation of a ball jacking screw, wherein (a) is a loosened state of the ball jacking screw; (b) the jacking state of the ball jacking screw is achieved.

FIG. 7 is a schematic view of a concave plug mounted on the top of the upper cover of the bearing housing;

FIG. 8 is a schematic structural view of the positioning screw body;

fig. 9 is a schematic view of the mounting process of the upper cover of the bearing housing.

The meaning of the various reference symbols in the drawings: 1. the device comprises a compressor shell, 2, an auxiliary process pipeline, 3, a bearing, 4, a lower bearing box, 5, an upper oil sealing sheet, 6, a slotted large round column head screw, 7, a bearing box upper cover, 8, a lifting ring, 9, a connecting flange, 10, a half coupling, 11, a ball jacking screw, 12, a concave screw plug, 13, a positioning screw, 14, a lower oil sealing sheet, 15, a middle split surface fastening screw, 16, an oil sealing sheet positioning groove, 17, a gasket, 18 and an axial oil return groove; 19. and (6) combining the gaskets.

The utility model is further explained below with reference to the drawings and the detailed description.

Detailed Description

The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.

As shown in fig. 3, 4 and 5, the oil baffle fastening device for the bearing box provided by the utility model comprises a detachable top fixing device, two axial oil return grooves 18 arranged on the middle surface of the lower bearing box 4 and at least four ball jacking screws 11; the detachable top fixing device is used for fixedly connecting the top of the upper bearing box cover 7 with the top of the upper oil sealing piece 5, at least two ball jacking screws 11 are respectively installed on the joint surfaces of two sides of the upper bearing box cover 7, which are connected with the lower bearing box 4, balls of the ball jacking screws 11 are positioned in the axial oil return grooves 18 and can move along the axial oil return grooves, the upper bearing box cover 7 can be driven to move upwards to be separated from the lower bearing box 4 when the ball jacking screws 11 are jacked up, and the split surfaces of the upper bearing box cover 7 and the lower bearing box 4 are completely attached when the ball jacking screws 11 are completely loosened; the middle split surfaces of the upper bearing box cover 7 and the lower bearing box 4 are fixedly connected through two groups of fastening screws 15. Wherein, ball jacking screw 11 includes jacking screw and sets up the ball at this jacking screw lower end. The ball-point jacking screw can adopt a common jacking screw (in the embodiment, a standard DIN 561-. This ball jacking screw 11 is because it is for traditional jacking screw when using, and its jacking face stress surface is bigger, has increased area of contact with the help of the transition structure of ball, has reduced positive pressure, and the face rotary extrusion when having reduced the jacking damages the plane that causes.

Among the above-mentioned technical scheme, through changing the traditional connected mode of last oil cover and bearing box upper cover 7 in the bearing box, the technology order that makes the bearing box dismouting has changed. Specifically be set up dismantled and assembled top fixing device on bearing box upper cover 7, and set up two axial oil return grooves 18 on the split face in lower bearing box 4, through can remove and can drive bearing box upper cover 7 upward movement's ball jacking screw 11 in the oil return groove, the difficult processing and the difficult dismouting of big round column cap screw 6 of slotting under having avoided traditional mounting structure, make operating personnel can make at bearing box upper cover 7 top with it and last quick dismouting between the mounting plate 5, and can utilize ball jacking screw 11 with its jack-up back, thereby it demolishs to keep away from compressor housing 1 along axial displacement for lower bearing box 4, after the completion is maintained to bearing box inside, also can conveniently reverse operation installs. The maintenance work of the bearing box and the inner parts of the bearing box is completed under the condition that the auxiliary process pipeline 2 of the centrifugal compressor is not disassembled, so that the damage of elements such as pipeline flange fasteners, gaskets and the like caused by repeated disassembly and assembly of the auxiliary process pipeline of the compressor is avoided, and the cost of spare parts of the process gas circuit is saved. Secondly, the pollution in the process of disassembling the auxiliary process pipeline 2 is avoided, and the work of cleaning, cleaning and the like before replacement and reinstallation is avoided for certain special medium gas pipelines. Thirdly, the bearing box dismounting and mounting period is greatly shortened, the on-site maintenance efficiency is improved, and the bearing box mounting and dismounting device is convenient and fast. Fourthly, the axial relative movement of the upper cover 7 of the bearing box on the lower bearing box 4 can be easily completed and the upper cover is not completely attached to the lower bearing box 4, thereby avoiding the influence on the sealant coated on the surfaces of the upper cover. Fifthly, only rolling friction between the supporting point (ball) and the oil return groove is generated during relative movement, and the structure of the centering surface is not adversely affected.

Specifically, as shown in fig. 6, the structure of the detachable top fixing device includes a threaded hole arranged at the top of the upper oil seal piece 5, a positioning screw 13, a threaded through hole arranged at the top of the upper cover 7 of the bearing box, and a concave plug 12. Wherein, the center of the threaded through hole at the top of the upper cover 7 of the bearing box corresponds to the center of the threaded hole of the upper oil sealing sheet 5 up and down; the positioning screw 13 is screwed in the threaded hole of the upper oil seal sheet 5 after penetrating through the threaded through hole of the upper bearing box 7, the concave screw plug 12 is fixed on the threaded through hole, and the upper end of the positioning screw 13 extends into the middle hole of the concave screw plug 12, so that the upper bearing box 7 and the upper oil seal sheet 5 are relatively fixed. The positioning screw 13 and the concave plug 12 jointly realize radial positioning of the upper oil seal piece 5, so that the upper oil seal piece is more stable.

Preferably, two ball jacking screws 11 are respectively installed on two joint surfaces of the upper bearing box cover 7 and the lower bearing box 4, so that the cost is saved to the greatest extent under the jacking effect of the upper bearing box cover 7.

Preferably, the outer edge of the upper oil seal 5 is embedded into the oil seal positioning groove 16 formed in the inner wall of the upper bearing box 7, so that the axial positioning of the upper oil seal 5 is realized, and the upper oil seal is more stable.

Preferably, the diameter of the positioning screw 13 is smaller than the thickness of the upper oil seal piece 5, preferably, the diameter of the positioning screw 13 is 1/2 of the thickness of the oil seal piece, and the thickness of the upper oil seal piece 5 is more than or equal to 6 mm.

Preferably, the positioning screw 13 is higher than the top of the threaded through hole of the upper bearing box 7, the higher is designed to facilitate disassembly), the higher height is h1-5mm in fig. 8 (here, 5mm is subtracted to leave a gap to prevent interference), the height is preferably 15mm, as shown in fig. 8, the positioning screw 13 is a partial thread, one section of the partial thread is a cylindrical rod (section L2), the other section of the partial thread is a threaded section (section L-L2), and the length of the threaded section is more than 10mm, preferably 15 mm.

Preferably, a combined gasket 19 is padded between the concave plug 12 and the upper cover 7 of the bearing box. The combined gasket is a composite body of rubber material and metal material, the metal part bears supporting force, the rubber part plays a role in sealing, and the combined gasket is adopted to ensure the combined position of the parts and simultaneously has the function of sealing and preventing leakage of a medium in the bearing box.

Preferably, the top of the upper bearing box cover 7 is provided with a lifting ring 8, and the lifting ring 8 is positioned on the half side of the upper bearing box cover 7 far away from the compressor shell, so that in the process of disassembling the upper bearing box cover 7, when the lifting ring 8 is positioned at a vertical lifting position, the lifting operation of the upper bearing box cover 7 can be completed.

The bearing box cover dismounting method applying the oil baffle fastening device for the bearing box comprises the following steps:

step 1, removing a concave screw plug 12 at the top of an upper cover 7 of a bearing box, and using a wrench to clamp the upper end of a positioning screw 13 to rotate until the upper end is removed from an upper oil sealing sheet 5;

step 2, detaching the fastening screws 15 on the split surfaces in the bearing box, and jacking the upper cover 7 of the bearing box by using the ball jacking screws 11;

and 3, falling the oil seal 5 under the action of gravity to separate from the oil seal positioning groove 16, moving the upper bearing box cover 4 in the direction away from the machine shell 1, sliding the ball jacking screw 11 in the axial oil return groove 18 where the ball jacking screw is located until the position of the lifting ring 8 reaches the position capable of being vertically lifted, and lifting by using a lifting machine to finish the dismounting operation of the upper bearing box cover 4.

The method for installing the bearing box cover by applying the oil baffle fastening device for the bearing box comprises the following steps of:

step 1, completely attaching the middle parting surface of the upper oil seal piece 5 to the middle parting surface of the lower oil seal piece 14;

step 2, pre-screwing all the ball jacking screws 11 to enable the ball jacking screws 11 to be in a jacking state, placing the upper bearing box cover 7 on the lower bearing box 4 by utilizing a hoisting device, enabling the balls of all the jacking screws 11 to be located in the axial oil return grooves 18, and coating sealant (namely sealant) on the inner end face of the upper bearing box cover 7 (namely the contact end face of the inner end face and the shell 1);

step 3, taking the ball jacking screw 11 as a supporting point, axially moving the upper bearing box cover 4 along the axial oil return groove 18 in a rolling friction mode in the moving process, and moving the upper bearing box cover 7 and the lower bearing box 4 to be aligned up and down in the split plane;

step 4, using the positioning screw 13 as a guide to ensure that the upper oil seal 5 is completely attached to an oil seal positioning groove 16 in the upper cover of the bearing box, and coating sealant on the middle surface of the lower bearing box 4 on the two sides of the upper oil return groove 18 on the middle surface of the lower bearing box;

step 5, loosening all the ball jacking screws 11 to ensure that the middle split positions of the upper bearing box cover 7 and the lower bearing box 4 are matched;

step 6, tightening fastening screws 15 on the middle facets on the two sides of the axis in the bearing box;

step 7, confirming that the positioning screw 13 is installed and fastened in place; placing the combined gasket 19;

and 8, enabling the upper end of the positioning screw 13 to be located in an inner hole of the concave screw plug 12, and installing the concave screw plug 12 in the threaded through hole at the top of the upper cover 7 of the bearing box to be fastened to finish the installation operation.

The device and the method are practiced in a natural gas purification plant, the original jacking screw is changed into the ball-head jacking screw, the oil return groove which is designed and processed originally is used for guiding, meanwhile, the structure is modified, the additional process pipeline for dismounting and mounting is saved for 2.5 hours in a single-time bearing box bearing adjustment operation on site, 8 DN25 metal winding pads are saved, and 2 people are saved. Therefore, the utility model can complete the maintenance work of the bearing box and the inner parts thereof under the condition of not disassembling the auxiliary process system pipeline of the centrifugal compressor, thereby avoiding the damage of elements such as a pipeline flange connecting bolt, a gasket and the like caused by repeatedly disassembling and assembling the auxiliary connecting system pipeline of the compressor and saving the cost of spare parts of the process gas. Meanwhile, pollution in the pipeline dismounting process is avoided, and cleaning work before replacement and reinstallation for certain special medium gas pipelines is avoided. And the bearing box assembling and disassembling period is greatly shortened, the on-site maintenance efficiency is improved, and the bearing box assembling and disassembling device is convenient and quick.

Claims (8)

1. An oil baffle fastening device for a bearing box is characterized by comprising a detachable top fixing device, two axial oil return grooves arranged on the split surface of a lower bearing box and at least four ball jacking screws; the detachable top fixing device is used for fixedly connecting the upper cover of the bearing box with the upper oil sealing sheet, at least two ball jacking screws are respectively installed on the end faces of two sides, connected with the upper cover of the bearing box and the lower bearing box, of the bearing box, balls of the ball jacking screws are located in the axial oil return grooves and can move along the axial oil return grooves, the upper cover of the bearing box can be driven to move upwards to be separated from the lower bearing box when the ball jacking screws are jacked, and when the ball jacking screws are loosened, the upper bearing box is attached to the middle split surface of the lower bearing under the action of gravity; the upper cover of the bearing box and the lower bearing box are fixedly connected through two groups of fastening screws.

2. The oil baffle fastening device for the bearing box as claimed in claim 1, wherein the structure of the detachable top fixing device comprises a threaded hole arranged at the top of the upper oil sealing sheet, a positioning screw rod, a threaded through hole arranged at the top of the upper cover of the bearing box and a concave plug; the center of the threaded through hole at the top of the upper cover of the bearing box corresponds to the center of the threaded hole of the upper oil sealing sheet up and down; the positioning screw penetrates through the threaded through hole in the top of the upper bearing box and then is in threaded connection with the threaded hole of the upper oil sealing sheet, the concave screw plug is fixed on the threaded through hole, and the upper end of the positioning screw extends into the concave hole of the concave screw plug, so that the upper cover of the bearing box and the upper oil sealing sheet are fixed relatively.

3. The oil retainer fastening device for the bearing housing as claimed in claim 1, wherein two ball jacking screws are respectively installed on both side end surfaces of the upper cover and the lower bearing housing of the bearing housing.

4. The oil retainer fastening device for a bearing housing as claimed in claim 1, wherein the outer edge of the upper oil seal is embedded in an oil seal positioning groove provided on the inner wall of the upper bearing housing to axially position the upper oil seal.

5. An oil retainer fastening device for a bearing housing as claimed in claim 2, wherein the diameter of the set screw is smaller than the thickness of the upper oil seal piece, and the thickness of the upper oil seal piece is not less than 6 mm.

6. An oil deflector fastening device for a bearing housing as claimed in claim 2, wherein the set screw is higher than the top of the threaded through hole of the upper bearing housing by a height of 15 mm.

7. An oil deflector fastening device for a bearing housing as claimed in claim 2, wherein a composite gasket is provided between the female plug and the threaded through hole at the top of the upper cover of the bearing housing.

8. The oil retainer fastening device for a bearing housing as claimed in claim 1, wherein a hanging ring is installed on a top portion of the upper cover of the bearing housing.

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