Labyrinth ring and magnetic levitation centrifugal compressor
By using a soft labyrinth ring to fit the impeller cover in the magnetic levitation centrifugal compressor, a throttling gap and expansion cavity are formed, which solves the problem of impeller and labyrinth ring damage under abnormal operating conditions, and achieves the effect of reducing leakage and extending equipment life.
Patent Information
- Application Number
- CN202423135246.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In existing magnetic levitation centrifugal compressors, under abnormal operating conditions, the aluminum alloy labyrinth rings are prone to friction and collision with the impeller, leading to damage to both the impeller and the labyrinth rings.
The labyrinth ring is made of soft material, and the sealing teeth fit into the impeller cover to form a series of interception gaps and expansion cavities. It uses the throttling effect to reduce gas leakage and allows the labyrinth ring to change shape under abnormal operating conditions to avoid damage.
It effectively reduces gas leakage, protects the impeller and labyrinth rings, extends equipment life, and reduces maintenance costs.
Smart Images
Figure CN223608903U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to mechanical seal field especially relates to a labyrinth ring and magnetic suspension centrifugal compressor. BACKGROUND
[0002] Compressor, it is a driven fluid machinery that low pressure gas is promoted as high pressure gas.
[0003] Magnetic suspension centrifugal compressor is a kind of compressor.Magnetic suspension centrifugal compressor is in the process of running, due to its rotor part and stationary part usually set aluminum alloy labyrinth ring, to prevent gas leakage.However, under abnormal conditions, magnetic suspension centrifugal compressor operation when impeller radial deflection increases, aluminum alloy labyrinth ring is prone to friction collision with impeller, leading to impeller and labyrinth ring are damaged. UTILITY MODEL CONTENTS
[0004] The utility model solves the technical problems to overcome the above-mentioned defects that aluminum alloy labyrinth is prone to cause impeller damage under abnormal conditions in prior art, provide a kind of labyrinth ring and magnetic suspension centrifugal compressor.
[0005] The utility model solves the above technical problems by the following technical solutions:
[0006] A kind of labyrinth ring, for magnetic suspension centrifugal compressor, the labyrinth ring is located at the diffuser plate of the magnetic suspension centrifugal compressor, the labyrinth ring has a plurality of interval arrangement sealing teeth, the sealing tooth is towards the impeller wheel cover of the magnetic suspension centrifugal compressor, the sealing tooth is attached to the impeller wheel cover, the material for making the labyrinth ring includes soft material.
[0007] In the scheme, by using the above structure, labyrinth ring is arranged between the diffuser plate and impeller wheel cover of magnetic suspension centrifugal compressor, and sealing tooth is attached to impeller wheel cover, so that series of interception gap and expansion cavity are formed between sealing tooth and impeller wheel cover, throttling effect is generated when sealed medium passes through the gap of tortuous labyrinth, so as to achieve the purpose of preventing gas leakage, and leakage amount can be reduced.Labyrinth ring adopts soft material, even if impeller radial deflection increases under abnormal conditions, labyrinth ring can be deformed under the compression of impeller, impeller can be avoided to be damaged, and labyrinth ring can be avoided to be damaged.
[0008] Optionally, the impeller wheel cover has a first fitting surface, and an end surface of the sealing tooth is attached to the first fitting surface.
[0009] Optionally, the impeller wheel cover has a second fitting surface, the second fitting surface is perpendicular to the first fitting surface, and the second fitting surface has a gap with the sealing tooth.
[0010] Optionally, the height of the second fitting surface along the radial direction of the labyrinth ring is matched with the height of the sealing tooth along the radial direction of the labyrinth ring.
[0011] Optionally, the sealing tooth is a bevel tooth or a straight tooth.
[0012] Optionally, the labyrinth ring has a step which is clamped on the diffuser plate.
[0013] Optionally, the soft material includes Teflon or nylon.
[0014] Optionally, the labyrinth ring is connected to the diffuser plate by bolts.
[0015] A magnetic suspension centrifugal compressor comprises the labyrinth ring as described above.
[0016] Optionally, the labyrinth ring is arranged on the diffuser plate of the magnetic suspension centrifugal compressor, and the diffuser plate, the labyrinth ring and the impeller cover form a labyrinth seal structure.
[0017] On the basis of common knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily, i.e. each preferred example of the present application is obtained.
[0018] The positive progress effect of the present application is that:
[0019] The labyrinth ring is arranged between the diffuser plate and the impeller cover of the magnetic suspension centrifugal compressor, and the sealing tooth is attached to the impeller cover, so that a series of flow interception gaps and expansion cavities are formed between the sealing tooth and the impeller cover. The throttling effect is generated when the sealed medium passes through the gaps of the labyrinth, so that the purpose of preventing gas leakage is achieved, and the leakage amount can be reduced. The labyrinth ring is made of soft material, and even if the radial deflection of the impeller increases under abnormal working conditions, the labyrinth ring can be deformed under the pressure of the impeller, so that the impeller and the labyrinth ring can be prevented from being damaged. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 FIG. 1 is a structure schematic diagram of a magnetic suspension centrifugal compressor according to an embodiment of the present application.
[0021] Figure 2 FIG. 2 is a structure schematic diagram of a labyrinth ring in a magnetic suspension centrifugal compressor according to an embodiment of the present application. Figure 1 FIG. 3 is a structure schematic diagram of another cross section of the labyrinth ring in the magnetic suspension centrifugal compressor according to an embodiment of the present application.
[0022] Figure 3 FIG. 4 is a structure schematic diagram of another cross section of the labyrinth ring in the magnetic suspension centrifugal compressor according to an embodiment of the present application. Figure 1 FIG. 5 is a structure schematic diagram of another cross section of the labyrinth ring in the magnetic suspension centrifugal compressor according to an embodiment of the present application.
[0023] LEGEND OF THE DRAWINGS:
[0024] Magnetic suspension centrifugal compressor 100
[0025] Labyrinth ring 1
[0026] Sealing teeth 11
[0027] Step 12
[0028] Oblique teeth 13
[0029] Straight teeth 14
[0030] Bolt 2
[0031] Diffuser plate 3
[0032] Impeller wheel cover 4
[0033] First fitting surface 41
[0034] Second fitting surface 42 DETAILED DESCRIPTION
[0035] The utility model will be explained more clearly and completely below by way of example and in conjunction with the drawings, but the utility model is not limited in the scope of the example by this.
[0036] As Figures 1-3 shown, the embodiment includes a labyrinth ring 1 and a magnetic suspension centrifugal compressor 100, wherein the labyrinth ring 1 is used for the magnetic suspension centrifugal compressor 100. The labyrinth ring 1 is arranged on the diffuser plate 3 of the magnetic suspension centrifugal compressor 100, and the diffuser plate 3, the labyrinth ring 1 and the impeller wheel cover 4 form a labyrinth seal structure.
[0037] In combination Figure 1 , the labyrinth ring 1 is arranged on the diffuser plate 3 of the magnetic suspension centrifugal compressor 100, the labyrinth ring 1 has a plurality of sealing teeth 11 arranged at intervals, the sealing teeth 11 are towards the impeller wheel cover 4 of the magnetic suspension centrifugal compressor 100, the sealing teeth 11 are fitted with the impeller wheel cover 4, and the material for manufacturing the labyrinth ring 1 includes a soft material. The labyrinth ring 1 is arranged between the diffuser plate 3 and the impeller wheel cover 4 of the magnetic suspension centrifugal compressor 100, and the sealing teeth 11 are fitted with the impeller wheel cover 4, so that a series of interception gaps and expansion cavities are formed between the sealing teeth 11 and the impeller wheel cover 4. The throttling effect is generated when the sealed medium passes through the gaps of the tortuous labyrinth, so that the purpose of preventing gas leakage is achieved, and the leakage amount can be reduced. The labyrinth ring 1 adopts a soft material, and even if the radial deflection of the impeller increases under abnormal working conditions, the labyrinth ring 1 can deform under the compression of the impeller, which can avoid damage to the impeller and also avoid damage to the labyrinth ring 1.
[0038] In Figure 1 , the impeller wheel cover 4 has a first fitting surface 41, and the end surface of the sealing teeth 11 is fitted with the first fitting surface 41. The first fitting surface 41 can be a curved surface, which can be better fitted with the sealing teeth 11.
[0039] As an embodiment, ideally, the distance between the two objects in contact is zero. In specific embodiments, it is difficult to achieve the ideal state of complete contact, and a specific gap can exist between the two objects in contact. In the present example, the gap between the two objects in contact can be no more than 0.15 mm.
[0040] The impeller cover 4 has a second contact surface 42, which is perpendicular to the first contact surface 41, and has a gap between the second contact surface 42 and the sealing teeth 11. The gap can provide more free space and can avoid wear.
[0041] The height of the second contact surface 42 along the radial direction of the labyrinth ring 1 is adapted to the height of the sealing teeth 11 along the radial direction of the labyrinth ring 1. Specifically, the height of the second contact surface 42 along the radial direction of the labyrinth ring 1 can be no more than the height of the sealing teeth 11 along the radial direction of the labyrinth ring 1.
[0042] In combination with Figure 2 and Figure 3 , the sealing teeth 11 are inclined teeth 13 or straight teeth 14. The inclined teeth 13 of the labyrinth ring 1 are changed to the straight teeth 14 structure in Figure 3 , which can further reduce the processing difficulty under the premise of ensuring sealing.
[0043] The labyrinth ring 1 has a step 12, which is clamped on the diffuser plate 3. The step 12 can facilitate the positioning of the labyrinth ring 1 to the diffuser plate 3.
[0044] The soft material includes Teflon or nylon. The labyrinth ring 1 is changed to soft materials such as Teflon (PTFE) and nylon to avoid damage to the impeller, prolong the service life of the impeller, and easily replace the labyrinth ring 1 after wear, thereby saving maintenance costs. Teflon, nylon and other materials not only have low cost, but also are easy to process. The material has good toughness, high compressive strength, and wear resistance, and can maintain good appearance and function during use, thereby ensuring the sealing of the labyrinth ring 1. The labyrinth ring 1 has better toughness and is not easy to be damaged when rubbing with the impeller. The labyrinth ring 1 made of soft material can protect the impeller, prolong the service life of the impeller, and significantly reduce the maintenance cost of the equipment. The soft material labyrinth ring 1 can reduce wear caused by hard contact while ensuring sealing effect, improve the reliability and economy of the entire system.
[0045] As an embodiment, the labyrinth ring 1 is connected to the diffuser plate 3 by a bolt 2.
[0046] In combination with Figure 1, the labyrinth ring 1 is locked on the diffuser plate 3 through the bolt 2, the inner ring sealing tooth 11 and the impeller wheel cover 4 jointly constitute a labyrinth seal device, the gas is raised in pressure through the impeller rotation, the outlet pressure is higher than the inlet pressure, the gap between the rotating part above the wheel cover and the static part has pressure difference at both ends, the gas at the high pressure end will leak to the low pressure end through the gap to generate leakage loss. In order to reduce the leakage, the labyrinth ring 1 is installed, the gas flows from the high pressure end to the low pressure end, and the flow in the labyrinth seal is equivalent to passing through multiple throttles, the pressure in each sealing cavity gradually decreases, the pressure drop on both sides of the single sealing tooth 11 is small, and the gas flow speed in the corresponding sealing gap is also small, and the leakage amount of the whole seal is reduced.
[0047] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, but these changes and modifications all fall within the protection scope of the present application.
Claims
1. A labyrinth ring for a magnetic levitation centrifugal compressor, characterized in that, The labyrinth ring is arranged on a diffuser plate of the magnetic suspension centrifugal compressor, the labyrinth ring has a plurality of sealing teeth arranged at intervals, the sealing teeth are directed to an impeller cover of the magnetic suspension centrifugal compressor, the sealing teeth are in close contact with the impeller cover, and a material for manufacturing the labyrinth ring includes a soft material.
2. The labyrinth ring of claim 1, wherein, The impeller cover has a first close contact surface, and an end surface of the sealing tooth is in close contact with the first close contact surface.
3. The labyrinth ring of claim 2, wherein, The impeller cover has a second close contact surface, the second close contact surface is perpendicular to the first close contact surface, and a gap is formed between the second close contact surface and the sealing tooth.
4. The labyrinth ring of claim 3 wherein, A height of the second close contact surface along a radial direction of the labyrinth ring is matched with a height of the sealing tooth along the radial direction of the labyrinth ring.
5. The labyrinth ring of claim 1 wherein, The sealing tooth is a bevel gear or a spur gear.
6. The labyrinth ring of claim 1 wherein, The labyrinth ring has a step, and the step is clamped on the diffuser plate.
7. The labyrinth ring of claim 1 wherein, The soft material includes Teflon or nylon.
8. The labyrinth ring of claim 1 wherein, The labyrinth ring is connected to the diffuser plate by bolts.
9. A magnetic levitation centrifugal compressor, characterized by, The magnetic suspension centrifugal compressor comprises the labyrinth ring according to any one of claims 1-8.
10. The magnetic suspension centrifugal compressor of claim 9, wherein, The labyrinth ring is arranged on a diffuser plate of the magnetic suspension centrifugal compressor, the diffuser plate, the labyrinth ring and the impeller cover form a labyrinth seal structure.