JP2021191954A - Scroll pump and labyrinth seal for sealing bearing of scroll pump - Google Patents

Abstract

To provide a seal for sealing a bearing of a scroll pump during a high speed operation.SOLUTION: A scroll pump includes two labyrinth seals for preventing leakage of a lubricant from a bearing to which a track scroll is attached. Each of the two labyrinth seals includes: a baffle plate which is attached adjacent to the bearing and partially hides a gap between an inner race and an outer race; and a disc attached in a manner that the disc is located adjacent to an outer surface of the baffle plate while facing the outer surface but does not contact with the outer surface. One of the baffle plate and the disc is attached so as to extend from the inner race and rotate, and the other is attached so as to extend from the outer race and go around in a track. The labyrinth seal is configured so that the baffle plate does not contact with the race and extend from the race so as to enable existence of a passage for the lubricant flowing from the bearing to a space between the outer surface of the baffle plate and an inner surface of the disc.SELECTED DRAWING: Figure 1

Description

The technical field of the present invention relates to scroll pumps and labyrinth seals for bearings in scroll pumps.

It is not easy to seal the bearings of a track scroll pump so that the lubricant in the bearings does not leak into the pump. The scroll pump is equipped with two alternating scrolls or involutes, one of which orbits the other. This traps the fluid in the pocket between each scroll for pumping and compression. In some cases, one of the scrolls is fixed, while the other is attached to the drive shaft with an eccentric cam so that it eccentricizes and orbits without rotation. Another method for generating relative orbital motion is by co-rotating the scroll with a synchronous but offset axis of rotation. Therefore, the two scrolls are mounted on parallel axes, and the relative motion is similar to one in orbit and the other stationary.

Bearings are used to mount the scroll on the crank sleeve of the drive shaft. The inner race of the bearing rotates with the drive shaft, but the outer race does not. The crank sleeve allows the orbital motion of the scroll, and the entire bearing orbits with the orbital scroll.

When sealing the lubricant in a bearing with a flexible plastic lip that contacts a moving race, track motion can deform the seal and cause leaks. Moreover, such a plastic sealing mechanism is a contact seal, which can result in high temperatures at high speeds.

It would be desirable to provide a seal for sealing the bearings of a scroll pump, which provides an effective seal especially during high speed operation.

In the first aspect, the scroll pump according to claim 1 is provided.

The inventor of the present invention recognizes that a bearing that attaches a track scroll to a drive shaft experiences the same track motion as the scroll, which tends to push the lubricant out of the bearing. The sealing means used to seal the bearings of a conventional scroll pump includes a flexible tip that comes into contact with a moving race, and this structure can generate heat. This heat generation can be noticeable at high speeds and can cause both deterioration of the lubricant and deformation of the flexible seal, no longer providing an effective seal. The inventor of the present invention addresses these issues by providing a non-contact seal, which provides an elongated passage for the lubricant remaining in the bearing, and this configuration provides temperature. It blocks this flow without the need for contact with flexible elements that can cause lift and seal wear. In addition, the seal is arranged such that one of the surfaces provides an elongated path and one of the inner surface of the baffle plate or the outer surface of the disc rotates with respect to the other, which is the surface of the baffle plate. It exerts a force on the lubricant in the space between it and the disk surface, which impedes the movement of the lubricant out of the seal and, in fact, can in some cases push the lubricant back towards the bearing.

It should be noted that the baffle plates and discs are mounted so as to extend from their respective inner races or outer races, and in this respect they are adjacent to and can be attached to the inner races or outer races. They extend beyond their respective races and can be attached, for example, to track scrolls and / or to drive shafts or crank sleeves on drive shafts.

Note that the bearing can be any kind of bearing with inner and outer races such as angular contact bearings, or roller bearings, or deep groove bearings.

In some embodiments, the baffle plate is configured such that the passage has a width of less than 500 microns, preferably less than 200 microns, more preferably less than 100 microns.

In order to block the flow of lubricant from the bearing, it is convenient that the passages that allow the seal to be a non-contact seal are narrowed so that some clearance for the flow of lubricant is not large. In some embodiments, the clearance is less than 500 microns, preferably less than 200 microns, and in some embodiments less than 100 microns.

In some embodiments, the baffle plate extends from the inner race and is configured to rotate with the inner race.

The baffle plate can extend from the inner race and the disc can extend from the inner race, but the baffle plate extends from the inner race and rotates together, which is a lot of embodiments away from the inner race and towards the outer race. This is convenient because it exerts a force on the lubricant in the passage towards the passage back to the bearing. This provides an effective way to prevent the lubricant from leaking out of the bearing.

In some embodiments, the baffle plate is configured to extend from the inner race to a location between 1/3 and 2/3 of the distance between the inner race and the outer race.

In some embodiments, the passage for the lubricant flowing out of the bearing can be between the baffle plate and the inner race or outer race where the baffle plate does not extend, but in other embodiments the baffle. There is a substantial gap left between the plate and the other of the inner race or outer race to which the baffle plate extends towards it, through which this gap provides space for relubrication of the bearing. do.

In some embodiments, the disc comprises a groove that allows access from the outer surface to the inner surface, which is part of the outer disc and is closer to the outer race than to the inner race. The groove does not open to the baffle plate, and the groove comprises an openable closing member for selectively concealing the groove.

Relubrication of the bearing through the gap between the inner baffle plate and the outer race can be done by removing the disc, or in some embodiments, a groove can be provided through the disc. This groove allows the lubricant to be supplied from the outer surface of the disc to the bearing. This groove has a closing member that seals the passage and prevents grease from leaking during operation of the pump. The closing member can be opened for relubrication of the bearing.

In some embodiments, the inner surface of the disc comprises a recess for accommodating the baffle plate and a protrusion configured to extend over the axial surface of the baffle plate, the passageway. Is surrounded by the axial surface of the baffle plate and the axial surface of the protrusion.

A passage can be formed between the baffle plate and one of the laces from which the baffle plate extends, but in some cases there is a gap between the baffle plate and the other of the laces that allows the addition of lubricant. In some cases, it is convenient that the disc is configured in a concave shape and is provided with a passage restricted by the axial surface of the inner plate and the corresponding axial surface of the disc protrusion located towards the center of the disc. Is. Thus, a narrow gap is provided that impedes the passage of the lubricant. One of the potential drawbacks of this structure is that the passage formed by the space between the baffle plate and the disc is not as long as the passage leading to one end of the baffle plate. However, especially if the baffle plate is mounted to rotate on the inner race, the movement of the baffle plate provides the force to push some lubricant that actually enters the passage back towards the bearing and the seal is still very very. It can be an effective non-contact seal. In addition, the passage at one end of the plate can be a place where the orbital motion of the scroll drives the lubricant towards it, and has a passage towards the center of the plate, as well as a place where the lubricant does not accumulate. be able to.

In some embodiments, the baffle and disc are made of metal.

In some embodiments, the baffle plate and disc can be formed of rigid material, which do not deform due to orbital motion and due to the rotational motion of one of the plates or discs. In some cases, this rigid material is metal. The metal is resistant to high temperatures, is rigid and provides an effective material for labyrinth seals. In some embodiments, the metal is aluminum, which is a lightweight material that does not easily corrode.

In some embodiments, at least one of the inner surface of the disk, the inner surface of the baffle plate, and the outer surface of the baffle plate is the result of this rotation during rotation of the drive shaft. The force of the lubricant adjacent to at least one surface has a contour configured to push the lubricant towards the bearing.

In some embodiments, at least one of the inner surface of the disc and the outer surface of the baffle plate is a lubricant in the space between the surfaces resulting from this rotation during rotation of the drive shaft. The force has a contour configured to push the lubricant towards the passage to the bearing.

As mentioned above, the rotating surface can provide a pumping action that pumps the lubricant between the baffle plate and the disc back towards the bearing, which is in shape bearing the lubricant as the drive shaft rotates. Contours can be improved by providing a contour in the space set between each surface so that the force is applied while pushing towards.

In some embodiments, the inner surface of the baffle plate facing the bearing is such that when the drive shaft is rotated, the force on the lubricant adjacent to the inner surface due to this rotation causes the lubricant. It has a contour configured to expel from the passage.

In addition to and / or instead of one or more surface contours that define the space between the outer disc and the baffle plate, the inner surface of the baffle plate facing the bearing is itself the baffle plate and. By expelling the lubricant from the passage between the baffle plate and the non-extending race, it is possible to have a contour configured to prevent the lubricant from flowing out of the bearing.

Additionally and / or alternatively, in some embodiments, the axial surface of the disc located orthogonal to the inner surface and adjacent to the race in which the disc does not move together is contoured. The contour is configured to push the fluid in the contour towards the inner surface of the disc when the pump is activated.

The disc can be significantly thicker than the baffle plate, and the axial surface of the disc is configured to push the fluid in the contour towards the inner surface of the disc when the pump is operating. It is also convenient to have. This can be due to the rotational movement of the disc when the disc rotates, or simply due to the orbital motion of the disc not rotating.

In some embodiments, the contour has at least one of a shaped groove, vane, fin, or thread, and in some cases, the contour has a spiral or spiral shape. ..

If the structure is such that the centrifugal force of the rotating element causes the fluid to flow along the structure towards the bearing in a particular direction, the contour can have multiple structures.

In some embodiments, the labyrinth seal comprises an additional disc, the additional disc comprises an inner surface, and the inner surface is mounted so that the inner surface faces the outer surface of the disc and is adjacent but not in contact. Additional discs are mounted to extend and move together from the race where the discs do not stretch and do not move together.

It is convenient to insert one or more additional discs adjacent to the outer surface of the disc so that the passage for the fluid is longer in order to extend the passage through which the lubricant passes when leaving the bearing. Is. It is also convenient to mount the discs so that every other disc rotates with the inner race so that each passage between the opposing surfaces has a rotating surface and a non-rotating surface.

In some embodiments, the scroll pump is a high speed scroll pump configured to rotate at speeds above 2000 RPM, possibly above 2,800 RPM, and above 3,5000 RPM.

At higher speeds, scroll pump bearings become increasingly difficult to effectively seal without increasing the temperature inside the bearings. The non-contact labyrinth seal according to the embodiment provides an effective seal without increasing the temperature perceived in the bearing.

However, bearings can be effective in scroll pumps that function as compressors, but are particularly effective in vacuum scroll pumps.

The second aspect provides the labyrinth seal according to claim 16.

Further specific preferred embodiments are described in the independent claims and the dependent claims. Dependent claims features may optionally be combined with the features of the independent claims and in combination with anything other than those explicitly stated in the claims.

Where a device feature is described as operable to provide a function, this includes a device feature that provides or is adapted or configured to provide that function. I want you to understand.
Embodiments of the present invention will be further described with reference to the accompanying drawings.

A bearing for attaching a track scroll to a drive shaft of a scroll pump according to an embodiment is shown. A bearing for mounting a labyrinth seal and an orbiting scroll according to an embodiment is shown. One bearing and seal are shown in more detail. A further embodiment of the bearing for mounting the labyrinth seal and track scroll according to a further embodiment is shown. Bearings and seals are shown in more detail. Further embodiments of the labyrinth seal are shown. Further embodiments are shown in more detail. A baffle plate according to one embodiment is shown.

Before explaining the embodiment in more detail, an outline is first presented.

A labyrinth seal configuration is provided to prevent the lubricant (grease in some cases) from leaking from the lubricated rotating element bearing. This configuration can include an active pump element for returning the lubricant to the bearing. The advantage of this type of seal is that it wears less and generates less heat than traditional contact sealing techniques.

Increased grease loss is a serious problem for scroll bearings in vacuum scroll pumps that operate at high speeds. This grease loss may be the result of a contact lip seal that deforms due to the large centripetal force caused by the orbital motion of the scroll. For example, the contact PTFE seal tends to deform at high speeds and become hot. To address the above problems, a labyrinth seal design is proposed that attempts to alleviate the thermal conditions in the bearing and the need for tight concentric tolerances.

The proposed sealing configuration provides a rigid non-contact component that does not bend or deform under such loads.

FIG. 1 is a cross-sectional view of a scroll pump bearing, drive shaft, and seal. The scroll pump comprises two back-to-back rolling element bearings 10 for mounting the track scroll 20 on the crank sleeve 22 of the drive shaft 30. Each bearing 10 comprises an inner race 12 configured to rotate with the crank sleeve 22 and a drive shaft 30, and a non-rotating outer race 14. The entire bearing, including the outer race, orbits with the track scroll 20.

The inner race 12 and the outer race 14 hold a rolling element 16 that allows the inner race 12 to rotate with respect to the outer race 14. The bearing 10 contains a lubricant that can be in the form of grease to reduce the friction caused by the relative motion of the inner race 12, the outer race 14, and the rolling elements 16.

The orbital motion of the bearing 10 tends to drive the lubricant out of the bearing, which can cause overheating and damage to the bearing and / or contamination of the surrounding space. In order to prevent the lubricant from leaking from the bearing, the labyrinth seal 40 is provided at one of the shaft ends of the bearing to prevent the lubricant from leaking from the gap between the inner race 12 and the outer race 14. It is designed to do.

In this embodiment, the labyrinth seal 40 includes a disc 41 and an inner baffle plate 44. Note that in this embodiment, the inner baffle plate 44 has a disc shape similar to that of the disc 41, but is narrower than the disc 41.

In this embodiment, the inner baffle plate 44 is attached to the crank sleeve 22 and rotates together with the crank sleeve and the inner race 12. Unless the baffle plate 44 extends toward the outer race 14 and comes into contact with the outer race 14, there is a narrow gap or passage 45 of about 100 microns in the embodiment between the outer race 14 and the baffle plate 44, and this narrow gap is formed. , Prevents the lubricant from coming out of the bearing 10. This provides a low friction seal with low wear. In this embodiment, the baffle plate 44 is made of aluminum.

Although the gap 45 is narrow, some lubricant escapes from the gap 45 during operation and enters the space 46 between the outer disc 41 and the baffle plate 44. The rotation of the baffle plate 44 with respect to the disk 41 tends to exert centrifugal force on the lubricant in the space 46, expelling the lubricant towards the passage 45 and returning it to the bearing. In practice, the labyrinth seal 40 prevents the lubricant from leaving the bearing by utilizing the pumping force provided by the long passages, narrow passages 45, and rotating baffle plates. In this embodiment, the narrow passage 45 between the baffle plate 44 and the outer race 14 is positioned where the orbital motion tends to expel the lubricant. However, this structure actually comprises a rotating inner plate, which turns the lubricant back towards this passage, and as a result, the structure provides an effective seal.

In this embodiment, the labyrinth path provided by the seal comprises a passage 46 formed by the space between the baffle plate 44 and the disc 41 and a passage 47 along the axial surface of the disc 44. In this embodiment, each of the inner and axial surfaces adjacent to the inner race has contours formed by grooves on their respective surfaces. This contour is designed so that the motion of the disc and the relative motion of the inner plate repel the lubricant towards the bearing along this contour. The contour of the groove on the inner surface of the disc 41 is a spiral configured such that centrifugal force pushes the lubricant back toward the passage 45 along the spiral. In reality, there is a propulsive force to pump the lubricant back into the bearing, which is formed from two mechanisms. One factor is the viscous shear force resulting from the centrifugal load, which pushes the lubricant radially outward towards the bearing. The second pump mechanism is due to the rotation of the baffle plate 44 in conjunction with the shape of the spiral on the disk 41 or the pumping function, which pressurizes the fluid in the gap and pushes the lubricant back into the bearing. Causes a windage.

In this embodiment, the ring bearing 10 around the drive shaft 30 and the crank sleeve 22 is provided on one side of the bearing or in order to prevent the lubricating oil from flowing out through the gap between the inner race and the outer race. It has a labyrinth seal 40 on the shaft end.

2A and 2B show embodiments similar to the embodiment of FIG. In this embodiment, there is no contour surface on the inner surface of the disc 41, the baffle plate 44 is attached to the rotating shaft, and the outer disc 41 is configured not to rotate with the outer race 14. A passage 45 is provided between the baffle plate and the outer race 14, which allows the rotating baffle plate to stay out of contact with the outer race, but provides a passage through which the lubricant can flow out of the bearing. ..

3A and 3B show another embodiment in which the baffle plate 44 is attached to the non-rotating outer race 14 and the orbital scroll 20, while the disc 41 is attached to the rotating inner race. In this embodiment, a narrow passage or gap 45 that provides a passage through which the lubricant can flow out of the bearing faces the inner race 12, and as a result, centrifugal and turbulent forces direct the lubricant towards the outer race. This would be a good place to put a passage, as it tends to be kicked out.

This structure prevents the lubricant from entering the narrow passage 45, but any lubricant that actually passes through the narrow passage 45 will be expelled radially outward rather than returning to the bearing. In some embodiments, additional labyrinth sets are added so that there is an additional rotating disc to provide radial pumping force to substantially homogenize the pumping force of the first labyrinth disc. be able to.

In this regard, in the above embodiments, only one disc 41 is provided, but in some embodiments, an extended labyrinth extending between the inner and outer surfaces of each disc. Multiple discs can be layered to provide a route. These discs are selectively mounted on the outside or inside of the bearing, so if the baffle plate is mounted on or adjacent to the inner race, the first disc is mounted on or adjacent to the outer race. , The second disc is mounted on the drive shaft side of the bearing, the third disc is mounted on the scroll side of the bearing, and so on.

4A and 4B show another embodiment in which the baffle plate 44 extends from the inner race 12 and rotates with the inner race 12, but is part of a path across the gap between the inner race 12 and the outer race 14. Only extends. This leaves space for access to the bearings when the disc 41 is removed in the example of FIG. 4A, which can be used to apply additional lubricant. In these embodiments, the narrow passage 45 is formed by a protrusion 42 of the disc 41 that projects above the axial outer surface of the baffle plate 44, blocking the flow of lubricant from the bearing 10. The narrow passage 45 between the baffle plate 44 and the disc 41 extends to only a small portion of the length of the baffle plate 44 and the disc 41 and therefore does not provide a passage as long as the other labyrinth seals.

In the embodiment shown in FIG. 4B, a groove 48 is provided between the inner surface and the outer surface of the disc 41 at a position where the disc is adjacent to the outer race and the tip of the inner baffle extends radially beyond the tip. .. This groove allows the bearing to be relubricated without the need to remove the disc 41. The groove 48 is closed by a stopper 49, which serves to seal the groove during pump operation and can be removed for relubrication.

FIG. 5 shows the baffle plate 44 according to one embodiment. In this embodiment, the baffle plate 44 includes blades 43 arranged on the inner surface of the baffle plate facing the bearing. These blades are configured to expel the lubricant from the narrow passage between the baffle plate and the outer race as the baffle plate rotates with the inner race, thus preventing the lubricant from flowing out of the bearing. Alternatively and / or additionally, the outer surface of the baffle plate facing outward from the bearing was configured to expel the lubricant towards the narrow passage between the baffle plate and the outer race as the baffle plate rotates. It can have blades (not shown) that eventually send the lubricant out of the bearing back to the bearing.

In summary, the embodiments are made of a non-curved rigid body material and are suitable for vacuum pumps such as scroll pumps that operate at high speeds up to 3600 RPM in some cases and do not significantly deteriorate over time due to non-contact temperature. Also provides a non-contact seal that does not rise. In addition, this seal provides an effective seal that utilizes narrow passages, relatively long paths, and the pumping action of pumping lubricant in the paths towards the bearings. The present embodiment also provides a scroll pump provided with such a seal.

In an embodiment, the proposed labyrinth seal is placed around two back-to-back angular contact ball bearings within the orbital scroll of the scroll pump. These bearings are secured to a crank sleeve that rotates on an eccentric radius around the drive shaft, resulting in orbital motion (along with an anti-rotation mechanism). Further, a counterbalance is provided for the purpose of adjusting the balance of the eccentric load of the track scroll.

The embodiment provides a plate for substantially closing the open area of the bearing to reduce or control the flow of lubricant out of the bearing. Since this is a non-contact seal, there is an open gap remaining, which is configured to narrow while still avoiding any metal-metal contact between the outer race of the bearing and the seal. The seals together include overlapping plates or discs that prevent lubricant loss in the axial line of sight. Lubricant that actually leaks through the inner baffle plate and flows into the space between the plates is radially expelled by the rotating baffle towards the bearing if the inner plate is mounted to rotate with the drive shaft. It will be pushed back.

The radial clearance between the outer disc and the shaft should be kept low as a final limit to any lubricant that actually travels through the labyrinth.

In some embodiments, the pump mechanism can be machined into the axial surface of the outer disc facing the baffle. This needs to be machined in such a direction that the lubricant is sent back towards the bearing. The pump mechanism can also be machined onto the inner diameter of the outer disc or the surface of the shaft to feed the grease axially toward the bearing. Additional and / or alternative, the pump mechanism can be included on the baffle plate to facilitate the flow of grease into the bearing.

The pump mechanism can be configured with various geometric designs that facilitate the movement of the lubricating oil, including, but not limited to, spirals, spirals, or any contours and formed grooves. Can form blades, fins, threads, etc.

Exemplary embodiments of the present invention will be disclosed in detail with reference to the accompanying drawings, but the present invention is not limited to the detailed embodiments, and those skilled in the art will find the scope of claims and their equivalents. It should be appreciated that various changes and modifications may be made within the scope of the invention without departing from the scope of the invention as defined by.

10 Bearing 12 Inner race 14 Outer race 16 Rolling element 20 Track scroll 22 Crank sleeve 30 Drive shaft 40 Labyrinth seal 41 Disc 42 Protruding surface 43 Blade 44 Baffle plate 45 Narrow passage 46 Between the inner surface of the disc and the outer surface of the baffle plate Space 47 Limit on the axial surface of the disc 48 Relubrication groove 49 Stopper

Claims (17)

A scroll pump comprising a track scroll and a fixed scroll, wherein the track scroll is attached to a drive shaft using a bearing, the scroll pump has two labyrinth seals to prevent lubrication from leaking from the bearing. The labyrinth seal is attached so as to seal each side surface including the gap between the inner race and the outer race of the bearing, and each of the two labyrinth seals is attached.
A baffle plate mounted adjacent to the bearing and configured to partially hide the gap between the inner race and the outer race, wherein the lubricant in the bearing faces the bearing. With the baffle plate, which comes into contact with the inner surface of the baffle plate and is now at least partially blocked from exiting the bearing by the baffle plate.
A disc comprising an inner surface, configured such that the inner surface faces the outer surface of the baffle plate and is adjacent but non-contacting.
Equipped with
One of the baffle plate and the disc is attached so as to extend from the inner race and rotate with the inner race, and the other of the baffle plate and the disc is attached so as to extend from the outer race and orbit with the outer race. ,
The labyrinth seal allows the baffle plate to flow from the baffle plate so that there is a passage for the lubricant to flow from the bearing into the space between the outer surface of the baffle plate and the inner surface of the disk. Is configured to avoid contact with the unextended race,
A scroll pump that features that. The baffle plate is configured such that the passage has a width of less than 500 microns, preferably less than 200 microns, more preferably less than 100 microns.
The scroll pump according to claim 1. The baffle plate is configured to extend from the inner race to a point between 1/3 and 2/3 of the distance between the inner race and the outer race.
The scroll pump according to claim 1 or 2. The inner surface of the disc comprises a recess for accommodating the baffle plate and a protrusion configured to extend above the axial surface of the baffle plate, the passage of which is said of the baffle plate. Surrounded by an axial surface and an axial surface of the protrusion,
The scroll pump according to claim 3. The passage is surrounded by an axial surface of the baffle plate and an inner surface of the lace from which the baffle plate does not extend.
The scroll pump according to claim 1 or 2. The baffle plate is configured to extend from the inner race and rotate with the inner race.
The scroll pump according to any one of claims 1 to 5. The baffle plate and disc are made of metal.
The scroll pump according to any one of claims 1 to 6. At least one of the inner surface of the disk and the outer surface of the baffle plate is lubricated by the force on the lubricant in the space between the surfaces due to the rotation during the rotation of the drive shaft. It has a contour configured to push the agent towards the passage to the bearing.
The scroll pump according to any one of claims 1 to 7. The inner surface of the baffle plate facing the bearing is configured such that when the drive shaft is rotated, the force on the lubricant adjacent to the inner surface due to the rotation expels the lubricant from the passage. Being contoured,
The scroll pump according to any one of claims 1 to 8. The axial surface of the disc, which is orthogonal to the inner surface and adjacent to the race where the disc does not move with it, has a contour that is the fluid in the contour when the pump is activated. Is configured to be extruded towards the inner surface of the disc.
The scroll pump according to any one of claims 1 to 9. The contour has at least one of a formed groove, blade, fin, or thread, and in some cases, the contour has a spiral or spiral shape.
The scroll pump according to any one of claims 8 to 10. The additional disc comprises an additional disc, the additional disc comprising an inner surface, the inner surface being configured such that the inner surface faces the outer surface of the disc and is adjacent but non-contacting. Additional discs are mounted so that they extend and move together from the race where the discs do not extend and do not move together.
The scroll pump according to any one of claims 1 to 11. The plurality of additional discs are provided so that the plurality of additional discs are mounted so that the plurality of additional discs are nested with each other, and the plurality of additional discs are alternated from inner race and outer race. Attached to extend and move together,
The scroll pump according to claim 12. The scroll pump is a high speed scroll pump configured to rotate at a speed of more than 2,000 RPM, sometimes more than 2,800 RPM, and sometimes more than 3,500 RPM.
The scroll pump according to any one of claims 1 to 13. The scroll pump constitutes a vacuum pump.
The scroll pump according to any one of claims 1 to 14. A labyrinth seal to prevent lubrication from leaking from bearings that attach the scroll pump's track scroll to the drive shaft.
A baffle plate mounted adjacent to the bearing and configured to partially hide the gap between the inner race and the outer race of the bearing, wherein the lubricant in the bearing is the said. With the baffle plate, which is in contact with the inner surface of the baffle plate facing the bearing and is now at least partially blocked from exiting the bearing by the baffle plate.
A disc comprising an inner surface, configured such that the inner surface faces the outer surface of the baffle plate and is adjacent but non-contacting.
Equipped with
One of the baffle plate and the disc is attached so as to extend from the inner race and rotate with the inner race, and the other of the baffle plate and the disc is attached so as to extend from the outer race and orbit with the outer race. ,
The labyrinth seal contacts the race with the baffle plate so that there is a passage for the lubricant to flow from the bearing into the space between the outer surface of the baffle plate and the inner surface of the disk. Instead, the baffle plate is configured so that it does not extend from the race, and the baffle plate is between 1/3 and 2/3 of the distance from the inner race to the inner race and the outer race. A labyrinth seal that is configured to extend at a point. The inner surface of the disc comprises a recess for accommodating the baffle plate and a protrusion configured to extend above the axial surface of the baffle plate, the passage of which is said of the baffle plate. The labyrinth seal according to claim 16, wherein the labyrinth seal is surrounded by an axial surface and an axial surface of the protrusion.

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