Combined gas seal assembly applied to high-speed direct-drive centrifugal refrigeration compressor and high-speed direct-drive centrifugal refrigeration compressor

Abstract

The utility model relates to centrifugal compressor refrigeration equipment field, propose a kind of combined gas seal assembly applied to high-speed direct-drive centrifugal refrigeration compressor, specifically including comb seal body, carbon ring seal body, sealing spacer and sealing seat.The sealing assembly is fixed on the gas leakage path behind compressor impeller by bolt connection.The combined gas seal assembly can effectively reduce the gas leakage amount in the working process of compressor, to improve the overall efficiency.The combined sealing assembly is fixed on end plate by screw, and can be easily disassembled and installed, increase the convenience of maintenance.

Description

Technical Field

[0001] This utility model generally relates to the field of centrifugal compressor refrigeration equipment, and more specifically, it relates to a combined gas sealing assembly applied to a high-speed direct-drive centrifugal refrigeration compressor. Background Technology

[0002] With the rapid development of digitalization and new energy, data centers are expanding in scale, and energy storage devices are being used more and more widely. The continuous operation of numerous servers within data centers generates high levels of heat, and energy storage devices also generate heat during charging and discharging. Small, high-speed direct-drive centrifugal compressors, due to their small size and high cooling efficiency, are increasingly used in data center air conditioning and energy storage thermal management. Therefore, improving the efficiency of centrifugal compressors is essential. Generally, the compressor needs to achieve a very high pressure ratio during operation, leading to increased gas leakage at the impeller. This leaked gas does not participate in effective work, resulting in a decrease in the overall efficiency of the compressor. Existing technologies use a large gap between the comb-tooth seal and the journal, resulting in limited sealing effectiveness. Furthermore, the sealing structure must withstand the impact and friction of gas under high pressure ratio conditions during the operation of high-speed direct-drive centrifugal compressors. After long-term use, wear and aging may cause a decline in sealing effectiveness, requiring regular maintenance or replacement. Patent document CN213360550U discloses a novel sealing device and a centrifugal compressor incorporating the same device. The novel sealing device combines a comb-tooth seal and a carbon ring seal, with the comb-tooth seal detachably fixed to the mounting housing, thus improving the sealing effect. However, its sealing assembly cannot be completely disassembled and installed, making regular maintenance inconvenient. Utility Model Content

[0003] Based on existing technology, the objective of this utility model is to provide a combined gas sealing assembly for use in high-speed direct-drive centrifugal refrigeration compressors. This combined gas sealing assembly can optimize sealing performance, reduce gas leakage, and improve overall machine efficiency. At the same time, the installation and disassembly process of this sealing assembly is simple and convenient for maintenance.

[0004] According to this invention, the above-mentioned task is achieved by a combined gas sealing assembly applied to a high-speed direct-drive centrifugal refrigeration compressor. The combined sealing assembly includes: A sealing seat having a channel for receiving a portion of a rotor, and a gap between the rotor and the sealing seat, wherein the sealing seat can be connected to the end plate of the compressor; A comb-tooth sealing body, disposed in the channel and having one or more comb-tooth structures respectively closing the gap; and A carbon ring seal body is arranged in the channel and following the comb seal body in the flow path of the leaking gas, the carbon ring seal body having one or more carbon ring sealing assemblies that respectively close the gap.

[0005] Furthermore, the combined sealing assembly is bolted to the end plate of the compressor.

[0006] Furthermore, the sealing assembly is arranged behind the impeller of the compressor in the gas flow direction.

[0007] Furthermore, the comb-shaped sealing body includes a plurality of sealing teeth spaced apart along the axial direction, wherein the material of the sealing teeth includes aluminum alloy.

[0008] Furthermore, the sealing gap width between the carbon ring sealing assembly and the journal is 0.02mm-0.1mm.

[0009] Furthermore, the combined sealing assembly also includes a sealing spacer configured to separate the carbon ring sealing assembly.

[0010] Furthermore, the sealing spacer is configured as a bent structure.

[0011] Furthermore, the comb-tooth seal body, the carbon ring seal assembly, and the sealing spacer can all be individually disassembled and installed relative to the sealing seat.

[0012] Furthermore, the inner diameter of the sealing seat is 140%-200% of the diameter of the rotor it accommodates.

[0013] This utility model also proposes a high-speed direct-drive centrifugal refrigeration compressor, which includes the aforementioned combined gas sealing assembly.

[0014] This invention proposes a combined gas sealing assembly for use in a high-speed direct-drive centrifugal refrigeration compressor, which has at least the following advantages: First, the combined sealing assembly of this invention includes a front comb-tooth seal body and a rear carbon ring seal body. During compressor operation, the carbon ring seal body can form a smaller sealing gap with the journal, which is much smaller than the sealing gap formed between the comb-tooth seal structure and the journal in the prior art. Its sealing effect is superior to that of the comb-tooth seal structure, and the multi-seal feature of the combined sealing assembly can also greatly reduce gas leakage, thereby improving the overall efficiency of the machine. Second, the combined sealing assembly is fixedly mounted on the end plate with screws. In the later compressor maintenance and upkeep process, the combined sealing assembly can be easily disassembled and installed. If some sealing components are damaged, some sealing components in the assembly can also be easily replaced, improving the convenience of maintenance. Attached Figure Description

[0015] To further illustrate the advantages and other features of the various embodiments of this utility model, a more specific description of the embodiments of this utility model will be presented with reference to the accompanying drawings. It is understood that these drawings depict only typical embodiments of this utility model and are therefore not intended to limit its scope. In the drawings, for clarity, the same or corresponding parts will be indicated by the same or similar reference numerals.

[0016] Figure 1 A cross-sectional view of a combined gas seal assembly applied to a high-speed direct-drive centrifugal refrigeration compressor according to one embodiment of the present invention is shown.

[0017] Figure 2 The diagram shows a structural schematic of a combined gas sealing assembly applied to a high-speed direct-drive centrifugal refrigeration compressor according to one embodiment of the present invention.

[0018] List of reference numerals 100 High-speed direct-drive centrifugal refrigeration compressor 1. Press shell 2 Impeller 3 end plates 4. Motor stator assembly 5 Rotor System 6. Combined sealing assembly 7. Comb-tooth sealing body 8 Sealing seat 9. Sealing spacer 10 Carbon ring seal body Detailed Implementation The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the components in the drawings may be shown exaggeratedly for illustrative purposes and are not necessarily to scale.

[0019] In this utility model, the various embodiments are merely intended to illustrate the solution of this utility model and should not be construed as limiting.

[0020] In this utility model, unless otherwise specified, the quantifiers “one” and “one” do not exclude scenarios involving multiple elements.

[0021] It should also be noted that in the embodiments of this utility model, only a portion of the parts or components may be shown for clarity and simplicity. However, those skilled in the art will understand that, under the teachings of this utility model, the required parts or components can be added according to the specific scenario.

[0022] It should also be noted that in the description of this utility model, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not explicitly or implicitly suggest that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In this invention, the term "rotor" encompasses "shaft" or "main shaft" because, in a centrifugal compressor, the rotor is the assembly of the core rotating components, while the shaft (also commonly referred to as "main shaft" or "rotor shaft") is the core load-bearing and transmission component of the rotor—the two are subordinate to each other as "assembly and core component," meaning that the shaft or main shaft is part of the rotor, and the rotor achieves power transmission, component positioning, and high-speed rotation functions through the shaft.

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 A cross-sectional view of a combined gas seal assembly applied to a high-speed direct-drive centrifugal refrigeration compressor according to one embodiment of the present invention is shown. Figure 1 As shown, the high-speed direct-drive centrifugal refrigeration compressor 100 consists of a pressure shell 1, an impeller 2, an end plate 3, a motor stator assembly 4, and a rotor system 5; the combined sealing assembly 6 is bolted to the end plate 3 and is located behind the impeller 2. When the compressor is running, gas leaking from the back of the impeller will enter the combined sealing assembly 6.

[0026] Figure 2 A schematic diagram of a combined gas seal assembly applied to a high-speed direct-drive centrifugal refrigeration compressor according to one embodiment of the present invention is shown. Figure 2As shown, the combined sealing assembly 6 includes a comb-tooth seal body 7, a carbon ring seal body 10, a sealing spacer 9, and a sealing seat 8. The comb-tooth seal body 7 is a trapezoidal ring made of aluminum alloy (such as 6061-T6 aluminum alloy) and contains multiple sealing teeth spaced axially. The comb-tooth seal body 7 is located at one end of the combined sealing assembly 6 near the impeller 2. The carbon ring seal body 10 includes two carbon ring sealing assemblies, which are sequentially installed on one side of the comb-tooth seal body 7. The sealing gap between the carbon ring sealing assembly and the journal is 0.02mm-0.1mm. The sealing spacer 9 is a bent structure installed between the two carbon ring sealing assemblies. The sealing seat 8 is installed at the bottom of the entire combined sealing assembly 6, providing structural support for the combined sealing assembly. It has a channel for accommodating a portion of the stator, and there is a gap between the stator and the sealing seat. The sealing seat 8 is configured to connect to the end plate 3 of the compressor. The inner diameter of the sealing seat 8 is 140%-200% of the diameter of the rotor it accommodates. When the compressor is running, after the gas is compressed by the impeller 2 and does work, it will pass through the comb-tooth seal body 7 and the carbon ring seal body 10 during the process of leaking into the motor through the back of the impeller, thus achieving multiple seals and reducing the amount of gas leakage.

[0027] The functions of each component in the combined sealing assembly 6 are described below: The comb seal 7 is configured as the front sealing structure of the combined sealing assembly 6. It initially blocks the gas from leaking from the back of the impeller to the inside of the motor. It achieves a certain sealing effect by utilizing the gap formed between itself and the journal, and shares the leakage pressure for the subsequent sealing structure. The carbon ring seal 10 is configured as the rear sealing structure of the combined sealing assembly 6. It consists of multiple carbon ring sealing components, which further block the leaked gas after passing through the comb seal. With better sealing effect and multiple protections of multiple components, the amount of gas leakage is greatly reduced. The sealing spacer 9 is configured to act as a separator in the combined sealing assembly 6, separating multiple carbon ring sealing components, maintaining the relative positions of each sealing component, and ensuring that the comb seal body 7 and the carbon ring seal body 10 work together in an orderly manner. The sealing seat 8 is configured as the mounting base for the combined sealing assembly 6, used to fix components such as the comb seal body 7, carbon ring seal body 10, and sealing spacer 9, and to install the entire combined sealing assembly 6 on the end plate 3 by bolt connection, so that the sealing structure has the feature of detachable assembly, which facilitates the disassembly and replacement of sealing components during later maintenance.

[0028] Although various embodiments of the present invention have been described above, it should be understood that they are presented by way of example only and not as limitations. It will be apparent to those skilled in the art that various combinations, modifications, and alterations can be made without departing from the spirit and scope of the present invention. Therefore, the breadth and scope of the present invention disclosed herein should not be limited by the exemplary embodiments disclosed above, but should be defined solely by the appended claims and their equivalents.

Claims

1. A combined gas seal assembly applied to a high-speed direct-drive centrifugal refrigeration compressor, characterized in that, include: A sealing seat having a channel for receiving a portion of a rotor, and a gap between the rotor and the sealing seat, wherein the sealing seat is configured to be connected to an end plate of a compressor. A comb-tooth sealing body, which is arranged in the channel and has one or more comb-tooth structures that respectively close the gap; as well as A carbon ring seal body is arranged in the channel and following the comb seal body in the flow path of the leaking gas, the carbon ring seal body having one or more carbon ring sealing assemblies that respectively close the gap.

2. The combined gas seal assembly for a high-speed direct-drive centrifugal refrigeration compressor according to claim 1, characterized in that, The combined gas sealing assembly is bolted to the end plate of the compressor.

3. A combined gas seal assembly for a high-speed direct-drive centrifugal refrigeration compressor according to claim 1, characterized in that, The sealing assembly is arranged behind the impeller of the compressor in the direction of gas flow.

4. A combined gas seal assembly for a high-speed direct-drive centrifugal refrigeration compressor according to claim 1, characterized in that, The comb-shaped sealing body includes a plurality of sealing teeth spaced apart along the axial direction, wherein the material of the sealing teeth includes aluminum alloy.

5. A combined gas seal assembly for a high-speed direct-drive centrifugal refrigeration compressor according to claim 1, characterized in that, The sealing gap width between the carbon ring sealing assembly and the journal is 0.02mm-0.1mm.

6. A combined gas seal assembly for a high-speed direct-drive centrifugal refrigeration compressor according to claim 1, characterized in that, It also includes a sealing spacer configured to separate the carbon ring sealing assembly.

7. A combined gas seal assembly for a high-speed direct-drive centrifugal refrigeration compressor according to claim 6, characterized in that, The sealing spacer is constructed as a bent structure.

8. A combined gas seal assembly for a high-speed direct-drive centrifugal refrigeration compressor according to claim 6, characterized in that, The comb-tooth seal, the carbon ring seal assembly, and the sealing spacer are all configured to be individually detachable and installable relative to the sealing seat.

9. A combined gas seal assembly for a high-speed direct-drive centrifugal refrigeration compressor according to claim 1, characterized in that, The inner diameter of the sealing seat is 140%-200% of the diameter of the rotor it accommodates.

10. A high-speed direct-drive centrifugal refrigeration compressor, characterized in that, Includes the combined gas sealing assembly as described in any one of claims 1-9 above.

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