CN118855751B

CN118855751B - A bearing box

Info

Publication number: CN118855751B
Application number: CN202411345731.XA
Authority: CN
Inventors: 王延竣
Original assignee: Dalian Shangyuan Intelligent Equipment Manufacturing Co ltd
Current assignee: Dalian Shangyuan Intelligent Equipment Manufacturing Co ltd
Priority date: 2024-09-26
Filing date: 2024-09-26
Publication date: 2024-11-22
Anticipated expiration: 2044-09-26
Also published as: CN118855751A

Abstract

The present invention relates to the technical field of bearing sealing, and specifically to a bearing box, comprising a pump shaft and a shell, both ends of the shell are provided with end covers, the pump shaft is rotatably arranged in the shell through two bearings, and the two ends of the pump shaft pass through the end covers, a mounting groove is provided on the side of the end cover close to the bearing, a sealing member is provided in the mounting groove, an oil baffle is provided on the side of the bearing away from the end cover, and lubricating oil is filled between the seal and the oil baffle; the seal comprises an inner ring and an outer ring, the end of the outer ring away from the inner ring faces the bearing, and the outer ring can be deformed along the radial direction of the pump shaft under the extrusion of the lubricating oil; a sealing groove is provided in the mounting groove, the end of the outer ring away from the inner ring is slidably matched with the sealing groove, and a sealing cavity is provided on the end of the outer ring away from the inner ring, and the lubricating oil can enter the sealing cavity, so that the sealing cavity is pressurized and expanded, and then the outer ring and the sealing groove are closely matched, thereby improving the bearing sealing effect.

Description

Bearing box

Technical Field

The invention relates to the technical field of bearing sealing, in particular to a bearing box.

Background

The bearing housing has a lubricant for lubricating the pump shaft, and a seal structure is usually provided in the bearing housing to prevent the lubricant in the bearing housing from leaking and contaminating the liquid. The existing sealing structure is usually a rubber sealing framework, and when the rubber sealing framework is in a high-temperature working state or working environment, the risk of leakage of lubricating oil can be increased due to the increase of pressure in the bearing box, so that the sealing effect is poor.

Disclosure of Invention

Accordingly, it is necessary to provide a bearing housing against the technical problem that the sealing effect of the conventional bearing housing sealing structure is poor.

The above purpose is achieved by the following technical scheme:

The bearing box comprises a pump shaft and a shell, wherein the two ends of the shell are respectively provided with an end cover, the pump shaft is rotationally arranged in the shell through two bearings, the two ends of the pump shaft penetrate out of the end covers, one side, close to the bearings, of the end covers is provided with an installation groove, a sealing piece is arranged in the installation groove, one side, far away from the end covers, of the bearings is provided with an oil baffle, the sealing piece and the oil baffle are respectively used for sealing the two ends of the bearings, and lubricating oil is filled between the sealing piece and the oil baffle; the sealing element comprises an inner ring and an outer ring, the inner ring is arranged on the outer circumferential surface of the pump shaft, the outer ring is conical, the diameter minimum end of the outer ring is sleeved on the inner ring, the end part of the outer ring, which is far away from the inner ring, faces the bearing, and the outer ring can deform along the radial direction of the pump shaft under the extrusion of lubricating oil; the mounting groove is internally provided with a sealing groove, the end part of the outer ring, which is far away from the inner ring, is in sliding fit with the sealing groove, the end part of the outer ring, which is far away from the inner ring, is provided with a sealing cavity, and lubricating oil can enter the sealing cavity, so that the sealing cavity is expanded under pressure, and the outer ring is tightly matched with the sealing groove.

Further, the inside of outer loop still is equipped with the intercommunication chamber, intercommunication chamber and sealed chamber intercommunication, be equipped with the oil inlet towards the bearing on the outer loop, oil inlet and intercommunication chamber intercommunication, the oil inlet supplies lubricating oil to get into the intercommunication chamber.

Further, the tip that the inner ring was kept away from to the outer loop has first annular protruding, be equipped with the second annular protruding on the first annular protruding, the seal chamber sets up on the second annular protruding, the seal groove includes annular groove and fan-shaped groove, first annular protruding and annular groove sliding seal cooperation, second annular protruding and fan-shaped groove sliding seal cooperation.

Further, be equipped with first pressure release subassembly on the outer loop, first pressure release subassembly includes first spiral seat and second spiral seat, first spiral seat is located the one side of outer loop towards the bearing, the second spiral seat is located the one side of outer loop towards the end cover, be equipped with first gasbag on the first spiral seat, be equipped with the second gasbag on the second spiral seat, the inside rotation of first spiral seat and second spiral seat is equipped with the piston rod, the piston rod runs through the intercommunication chamber, the screw thread of first spiral seat is revolved to the same with the screw thread of second spiral seat.

Further, the outside of piston rod is only changeed and is equipped with the axis of rotation, the axis of rotation is located the inside in intercommunication chamber, the fixed rotating turret that is equipped with in the axis of rotation, be equipped with the roller that rolls on the rotating turret, the roller that rolls is used for the roof pressure seal chamber.

Further, be equipped with the second pressure release subassembly on the outer loop, the second pressure release subassembly includes annular sealing plate, the fixed setting of annular sealing plate is in on the first annular arch, annular sealing plate and fan-shaped groove sliding seal cooperation, and annular sealing plate with form the oil storage chamber between the second annular arch, annular sealing plate includes sealed fixed plate and sealed sliding plate, sealed fixed plate and sealed sliding plate are distributed in turn around the axis of pump shaft, sealed sliding plate can be relative sealed fixed plate is followed fan-shaped groove slides.

Further, the arc length of the fan-shaped groove extends along the axial direction of the pump shaft, limiting plates are arranged on two sides of the sealing fixing plate along the arc length direction of the fan-shaped groove, a limiting plate is arranged on one side, far away from the bearing, of the sealing sliding plate, and the limiting plate is a rigid component.

Further, the two sides of the sealing sliding plate, which are in sliding fit with the sealing fixed plate, are inclined surfaces, and the length of the side surface of the sealing sliding plate, which faces the bearing, is shorter than the length of the side surface of the sealing sliding plate, which faces away from the bearing.

Further, the oil storage cavity is internally provided with a third air bag, the inside of the first annular bulge is provided with a balance cavity, the balance cavity is internally provided with a fourth air bag, and the third air bag is communicated with the fourth air bag through a connecting pipe.

Further, a plunger is detachably mounted on the housing, the plunger corresponding to a position between the bearing and the seal.

The beneficial effects of the invention are as follows:

According to the bearing box provided by the invention, when the internal pressure of the bearing box is increased, lubricating oil is extruded outwards to enable the end part of the outer ring, which is far away from the inner ring, to deform along the radial direction of the pump shaft, and further the end part of the outer ring, which is far away from the inner ring, is tightly matched with the sealing groove, and on the other hand, lubricating oil can enter the sealing cavity of the outer ring, so that the sealing cavity is expanded, the end part of the outer ring is tightly connected with the sealing groove, and the sealing effect of the bearing is improved.

Drawings

FIG. 1 is a schematic perspective view of a bearing housing according to an embodiment of the present invention;

FIG. 2 is a side view of a bearing housing according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is an enlarged view of the structure at X in FIG. 3;

FIG. 5 is an enlarged view of the structure at Y in FIG. 4;

FIG. 6 is an enlarged view of the structure at Z in FIG. 5;

FIG. 7 is an exploded view of a bearing housing according to an embodiment of the present invention;

FIG. 8 is a schematic view of a seal in a bearing housing according to an embodiment of the present invention;

FIG. 9 is an exploded view of a seal in a bearing housing according to an embodiment of the present invention;

FIG. 10 is an enlarged view of the structure at B in FIG. 9;

Fig. 11 is a schematic structural diagram of a first pressure relief assembly in a bearing housing according to an embodiment of the present invention.

Wherein:

410. A housing; 420. a pump shaft; 430. an oil baffle plate; 440. an end cap; 441. a fan-shaped groove; 450. a guard board; 460. a plunger; 500. a bearing; 600. a seal; 610. an inner ring; 620. a rotating frame; 621. a roller; 630. a first pressure relief assembly; 631. a first air bag; 632. a first screw seat; 633. a piston rod; 634. a rotating shaft; 635. a second screw seat; 636. a second air bag; 640. an outer ring; 641. a first annular projection; 642. a second annular projection; 643. a communication chamber; 644. an annular sealing plate; 6441. sealing the sliding plate; 6442. sealing the fixing plate; 645. a limiting plate; 646. an inclined plane; 647. an oil inlet; 648. a mounting hole; 649. a third air bag; 650. and a fourth air bag.

Detailed Description

The present invention will be further described in detail below with reference to examples, which are provided to illustrate the objects, technical solutions and advantages of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The numbering of components herein, such as "first," "second," etc., is used merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

As shown in fig. 1 to 11, the bearing housing provided in an embodiment of the present invention includes a pump shaft 420 and a housing 410, wherein end caps 440 are fixedly disposed at two ends of the housing 410, the pump shaft 420 is rotatably disposed in the housing 410 through two bearings 500, two ends of the pump shaft 420 penetrate out of the end caps 440, a mounting groove is disposed at one side of the end caps 440, which is close to the bearings 500, a sealing member 600 is disposed in the mounting groove, an oil baffle 430 is disposed at one side of the bearings 500, which is far away from the end caps 440, the sealing member 600 and the oil baffle 430 respectively seal two ends of the bearings 500, and lubricating oil is filled between the sealing member 600 and the oil baffle 430; the seal 600 includes an inner ring 610 and an outer ring 640, the inner ring 610 is disposed on the outer circumferential surface of the pump shaft 420, the outer ring 640 is conical and the smallest diameter end is sleeved on the inner ring 610, the end of the outer ring 640 far away from the inner ring 610 faces the bearing 500, and the outer ring 640 can deform along the radial direction of the pump shaft 420 under the extrusion of lubricating oil; the mounting groove is internally provided with a sealing groove, the end part of the outer ring 640 far away from the inner ring 610 is in sliding fit with the sealing groove, the end part of the outer ring 640 far away from the inner ring 610 is provided with a sealing cavity, and lubricating oil can enter the sealing cavity to enable the sealing cavity to be compressed and expanded so as to enable the outer ring 640 to be in tight fit with the sealing groove. The middle position of the end cover 440 is provided with a guard plate 450, the guard plate 450 is sleeved on the periphery of the pump shaft 420, and the guard plate 450 prevents external impurities from entering the bearing box.

In an embodiment, a communication cavity 643 is further provided in the outer ring 640, the communication cavity 643 is communicated with the sealing cavity, an oil inlet 647 facing the bearing 500 is provided on the outer ring 640, the oil inlet 647 is communicated with the communication cavity 643, and lubricating oil is supplied to the communication cavity 643 by the oil inlet 647.

When the pressure inside the casing 410 increases, the lubricating oil is pressurized so as to enter the communication chamber 643 of the outer ring 640 through the oil inlet 647, and then enter the seal chamber through the communication chamber 643. This allows, on the one hand, the release of the pressure inside the casing 410 and, on the other hand, the expansion of the sealing chamber, which enhances the sealing effect between the outer ring 640 and the sealing groove.

In an embodiment, the end of the outer ring 640 away from the inner ring 610 has a first annular protrusion 641, the first annular protrusion 641 is provided with a second annular protrusion 642, the seal cavity is provided on the second annular protrusion 642, the seal groove includes an annular groove and a sector groove 441, the first annular protrusion 641 is in sliding sealing engagement with the annular groove, and the second annular protrusion 642 is in sliding sealing engagement with the sector groove 441. Thus, the outer ring 640 forms a two-stage seal with the seal groove, so that the sealing effect is better.

In an embodiment, the outer ring 640 is provided with a first pressure relief assembly 630, the first pressure relief assembly 630 includes a first screw seat 632 and a second screw seat 635, the first screw seat 632 is mounted on one side of the outer ring 640 facing the bearing 500 through a mounting hole 648, the second screw seat 635 is mounted on one side of the outer ring 640 facing the end cover 440 through a mounting hole 648, the first screw seat 632 is provided with a first air bag 631, the second screw seat 635 is provided with a second air bag 636, the inside of the first screw seat 632 and the inside of the second screw seat 635 are respectively provided with a screw groove, a piston rod 633 is rotationally arranged in the two screw grooves, the piston rod 633 penetrates through the communication cavity 643, and the screw thread rotation direction of the first screw seat 632 is the same as the screw thread rotation direction of the second screw seat 635. The mounting holes 648 are alternately arranged with the oil inlets 647 on the outer ring 640.

When the pressure inside the case 410 is large, the lubricant presses the first balloon 631, so that the first balloon 631 pushes the piston rod 633 to rotate while approaching the second balloon 636 in the axial direction, and further the second balloon 636 is inflated, thereby relieving the pressure inside the case 410. At the same time, the second air bag 636 expands to increase the pressure between the sealing member 600 and the end cap 440, thereby reducing the pressure difference across the sealing member 600 and further reducing the leakage risk of the lubricating oil.

In an embodiment, the outer rotation stopping part of the piston rod 633 is provided with a rotation shaft 634, the rotation shaft 634 is located inside the communication cavity 643, a rotation frame 620 is fixedly arranged on the rotation shaft 634, a rolling roller 621 is arranged on the rotation frame 620, and the rolling roller 621 is used for pressing the sealing cavity. The rotation of the piston rod 633 drives the rotating frame 620 to rotate, so that the rolling roller 621 on the rotating frame 620 pushes the sealing cavity, the sealing cavity is better opened, and the second annular protrusion 642 is more tightly contacted with the sector groove 441, so that the sealing effect is improved.

In an embodiment, the outer ring 640 is provided with a second pressure relief assembly, the second pressure relief assembly includes an annular seal plate 644, the annular seal plate 644 is fixedly disposed on the first annular protrusion 641, the annular seal plate 644 is in sliding seal fit with the fan-shaped groove 441, an oil storage cavity is formed between the annular seal plate 644 and the second annular protrusion 642, the annular seal plate 644 includes a seal fixing plate 6442 and a seal sliding plate 6441, the seal fixing plate 6442 and the seal sliding plate 6441 are alternately distributed around the axis of the pump shaft 420, and the seal sliding plate 6441 can slide along the fan-shaped groove 441 relative to the seal fixing plate 6442. Thus, when the internal pressure of the casing 410 is further increased, the lubricant will press the seal sliding plate 6441, and the lubricant will enter the oil storage cavity from the connection between the seal sliding plate 6441 and the sliding seal ring, so as to further relieve the pressure inside the casing 410.

In an embodiment, the arc length of the fan-shaped groove 441 extends along the axial direction of the pump shaft 420, and along the arc length direction of the fan-shaped groove 441, both sides of the seal fixing plate 6442 are provided with a limit plate 645, one side of the seal sliding plate 6441 away from the bearing 500 is provided with a limit plate 645, and the limit plate 645 is a rigid component. The stopper 645 is provided to block the seal fixing plate 6442 and the seal sliding plate 6441, so that the seal fixing plate 6442 cannot slide, and only the end portion of the seal sliding plate 6441 can slide toward the bearing 500.

In the present embodiment, the seal sliding plate 6441 is slidably engaged with the seal fixing plate 6442 by the inclined surface 646, the inclined surface 646 extends in the sliding direction of the seal sliding plate 6441, and the inclined surface 646 makes the side surface of the seal sliding plate 6441 facing the bearing 500 shorter in length than the side surface of the seal sliding plate 6441 facing away from the bearing 500. The shape of the seal fixing plate 6442 matches the shape of the seal sliding plate 6441. When the seal sliding plate 6441 is pressed, the joint between the seal sliding plate 6441 and the seal fixing plate 6442 is deformed, so that lubricating oil can enter the oil storage chamber. When the pressure in the case 410 is reduced, the seal sliding plate 6441 can be deformed slidingly toward the bearing 500 side, so that the lubricating oil in the oil reservoir is sucked out, thereby balancing the pressure in the case 410. The inclined surface 646 is designed to reduce friction between the seal sliding plate 6441 and the seal fixing plate 6442, and to improve tightness between the seal sliding plate 6441 and the seal fixing plate 6442, so that the oil storage cavity cannot be filled with oil under normal conditions.

In an embodiment, the third air bag 649 is disposed in the oil storage cavity, the balance cavity is disposed in the first annular protrusion 641, the fourth air bag 650 is disposed in the balance cavity, and the third air bag 649 and the fourth air bag 650 are communicated through a connecting pipe. After the pressure in the oil storage cavity increases to a certain extent, the lubricating oil further presses the third air bag 649, and the third air bag 649 contracts to expand the fourth air bag 650, so that the pressure in the oil storage cavity is further released. In the initial state, the fourth air bag 650 has a smaller volume than the third air bag 649.

In one embodiment, a plunger 460 is removably mounted to the housing 410, the plunger 460 corresponding to a position between the bearing 500 and the seal 600. In use, lubricant may be injected into the interior of housing 410 by opening plunger 460.

In this embodiment, inner ring 610, outer ring 640 and annular seal plate 644 are all made of rubber material. The first balloon 631, the second balloon 636, the third balloon 649, and the fourth balloon 650 are all rubber balloons.

In combination with the above embodiment, the use principle and working process of the embodiment of the present invention are as follows:

The seal 600 is installed in the installation groove of the end cover 440, and the first annular protrusion 641 of the seal 600 is in sealing sliding fit with the arc-shaped groove, and the second annular protrusion 642 of the seal 600 is in sealing sliding fit with the sector-shaped groove 441, thereby realizing two-stage sealing fit, and then the oil baffle 430, the bearing 500, and the end cover 440 and the guard plate 450 are installed on the pump shaft 420 in sequence. Lubricating oil is injected between the oil deflector 430 and the seal 600 by opening the plunger 460. Along with the gradual increase of the internal pressure of the casing 410, the lubricating oil presses the outer ring 640 outwards on one hand, so that the outer ring 640 deforms along the radial direction of the pump shaft 420, and the first annular protrusion 641 is tightly matched with the arc-shaped groove, on the other hand, the lubricating oil is pressed, so that the lubricating oil enters the communication cavity 643 of the outer ring 640 through the oil inlet 647, and then enters the sealing cavity through the communication cavity 643, on the one hand, the internal pressure of the casing 410 can be released, and on the other hand, the sealing effect between the second annular protrusion 642 and the fan-shaped groove 441 can be enhanced by expanding the sealing cavity. Meanwhile, the lubricating oil can squeeze the first air bag 631, so that the first air bag 631 pushes the piston rod 633 to rotate and simultaneously approaches the second air bag 636 along the axial direction of the piston rod 633, and then the second air bag 636 is inflated, so that the pressure in the shell 410 is reduced, meanwhile, the rotating of the piston rod 633 can drive the rotating frame 620 to rotate, the rolling roller 621 on the rotating frame 620 pushes the sealing cavity, the opening effect of the sealing cavity is better, the contact between the second annular protrusion 642 and the sector groove 441 is tighter, and the sealing effect is improved; the second bladder 636 expands to increase the pressure between the seal 600 and the end cap 440, reducing the pressure differential across the seal 600, thereby reducing the risk of leakage of lubrication oil. When the internal pressure of the casing 410 is further increased, the lubricating oil presses the seal sliding plate 6441, so that the seal sliding plate 6441 slides relative to the seal fixing plate 6442, and the lubricating oil enters the oil storage cavity from the joint between the seal sliding plate 6441 and the seal fixing plate 6442, thereby further reducing the internal pressure of the casing 410. When the pressure in the oil storage cavity increases to a certain extent, the lubricating oil further presses the third air bag 649, and the third air bag 649 contracts to expand the fourth air bag 650, so that the pressure in the oil storage cavity is further released. When the pressure in the case 410 is reduced, the seal sliding plate 6441 can be deformed toward the bearing 500 side, so that the lubricating oil in the oil storage chamber is sucked out, thereby balancing the pressure in the case 410; while the fourth balloon 650 is contracted to expand the third balloon 649 until the two reach an equilibrium state.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims

1. The bearing box is characterized by comprising a pump shaft and a shell, wherein the two ends of the shell are respectively provided with an end cover, the pump shaft is rotationally arranged in the shell through two bearings, the two ends of the pump shaft penetrate out of the end covers, one side, close to the bearings, of the end covers is provided with an installation groove, a sealing element is arranged in the installation groove, one side, away from the end covers, of the bearings is provided with an oil baffle, the sealing element and the oil baffle are respectively used for sealing the two ends of the bearings, and lubricating oil is filled between the sealing element and the oil baffle; the sealing element comprises an inner ring and an outer ring, the inner ring is arranged on the outer circumferential surface of the pump shaft, the outer ring is conical, the diameter minimum end of the outer ring is sleeved on the inner ring, the end part of the outer ring, which is far away from the inner ring, faces the bearing, and the outer ring can deform along the radial direction of the pump shaft under the extrusion of lubricating oil; the mounting groove is internally provided with a sealing groove, the end part of the outer ring, far away from the inner ring, is in sliding fit with the sealing groove, the end part of the outer ring, far away from the inner ring, is provided with a sealing cavity, lubricating oil can enter the sealing cavity, the sealing cavity is expanded under pressure to enable the outer ring to be in tight fit with the sealing groove, the inside of the outer ring is also provided with a communicating cavity, the communicating cavity is communicated with the sealing cavity, the outer ring is provided with an oil inlet towards a bearing, the oil inlet is communicated with the communicating cavity, the oil inlet is used for lubricating oil to enter the communicating cavity, the end part of the outer ring, far away from the inner ring, is provided with a first annular bulge, the first annular bulge is provided with a second annular bulge, the sealing cavity is arranged on the second annular bulge, the sealing groove comprises an annular groove and a fan-shaped groove, the first annular bulge is in sliding sealing fit with the annular groove, and the second annular bulge is in sliding sealing fit with the fan-shaped groove, the first pressure relief component comprises a first spiral seat and a second spiral seat, the first spiral seat faces one side of the bearing, the second spiral seat is positioned on one side of the outer ring facing the end cover, the first spiral seat is provided with a first air bag, the second spiral seat is provided with a second air bag, the inner parts of the first spiral seat and the second spiral seat are rotationally provided with a piston rod, the piston rod penetrates through the communication cavity, the screw thread screwing direction of the first spiral seat is the same as the screw thread screwing direction of the second spiral seat, the outer part of the piston rod is rotationally provided with a rotating shaft, the rotating shaft is positioned in the communication cavity, a rotating frame is fixedly arranged on the rotating shaft, the rotating frame is provided with a rolling roller which is used for propping up the sealing cavity, the outer ring is provided with the second pressure relief component, the second pressure relief assembly comprises an annular sealing plate, the annular sealing plate is fixedly arranged on the first annular protrusion, the annular sealing plate is in sliding sealing fit with the sector groove, an oil storage cavity is formed between the annular sealing plate and the second annular protrusion, the annular sealing plate comprises a sealing fixing plate and a sealing sliding plate, the sealing fixing plate and the sealing sliding plate are alternately distributed around the axis of the pump shaft, and the sealing sliding plate can slide along the sector groove relative to the sealing fixing plate.

2. The bearing housing of claim 1, wherein the arcuate length of the scallop extends along the axial direction of the pump shaft, and along the arcuate length of the scallop, both sides of the seal retainer plate are provided with a stop plate, and one side of the seal retainer plate remote from the bearing is provided with a stop plate, which is a rigid member.

3. The bearing housing of claim 2, wherein the two sides of the sealing slide plate in sliding engagement with the sealing stationary plate are inclined surfaces which make the side of the sealing slide plate facing the bearing shorter than the side of the sealing slide plate facing away from the bearing.

4. A bearing housing according to claim 3, wherein a third air bag is provided in the oil storage chamber, a balancing chamber is provided in the first annular protrusion, a fourth air bag is provided in the balancing chamber, and the third air bag is communicated with the fourth air bag through a connecting pipe.

5. The bearing housing of claim 1, wherein a plunger is removably mounted to the housing, the plunger corresponding to a position between the bearing and the seal.