Labyrinth seal, mechanical equipment and compressed air energy storage system
By introducing gap adjustment components and inclined seal structures into the maze seal, the problems of unadjustable throttling gaps and large leakage in the existing maze seals are solved, achieving a more efficient sealing effect and improving the operating efficiency of equipment and systems.
Patent Information
- Application Number
- CN202411423722.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-01-14
AI Technical Summary
The existing labyrinth seals have a large throttling gap during installation, which makes it difficult to reduce the leakage amount, and the existence of a ‘direct through’ effect leads to a large leakage amount.
A maze seal consisting of a sealing shell and a sealing sleeve is designed to accurately adjust the throttling gap through the gap adjustment assembly (round nut, finned gasket and sliding groove), and the inclined design of the sealing comb teeth and steps increases turbulent resistance to avoid 'Direct Through' effect.
It realizes precise control of sealed throttling gaps, reduces leakage, and improves the operating efficiency of mechanical equipment and compressed air energy storage systems.
Smart Images
Figure CN119309011A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of dynamic sealing, and in particular to a labyrinth seal, mechanical equipment and a compressed air energy storage system. Background Art
[0002] Labyrinth seals are commonly used to seal between rotating and stationary parts of mechanical equipment. They consist of a series of throttling gaps that are non-contact with the rotor and a dissipation cavity thereafter. The function of the throttling gap is to convert the pressure energy of the upstream fluid into kinetic energy through throttling. The fluid then enters the dissipation cavity, which dissipates the kinetic energy into heat energy through turbulent vortices instead of restoring it to pressure energy, i.e., turbulence increases resistance. The above process is repeated to achieve the effect of reducing leakage.
[0003] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the existing labyrinth seal, in order to prevent rotational interference between rotating parts and stationary parts, is also limited by the need to consider installation accuracy. The throttling gap is too large during installation, and the throttling gap cannot be adjusted after installation. Once installed, it is difficult to further reduce the leakage. Summary of the invention
[0004] The object of the present invention is to provide a labyrinth seal capable of accurately adjusting and controlling the sealing throttling gap.
[0005] To achieve this purpose, a labyrinth seal is provided, comprising a sealing shell fixed and connected to a stationary part and a sealing sleeve fixed and connected to a rotating part; sealing comb teeth are arranged on the inner side wall of the sealing shell, and a sealing step is arranged on the sealing sleeve, and a throttling gap is formed between the sealing comb teeth and the sealing step; and a gap adjustment component is also included to enable the sealing sleeve to translate, and the size of the throttling gap is adjusted by adjusting the gap adjustment component.
[0006] Furthermore, the gap adjustment assembly includes a round nut, and the rotating member is provided with an external thread threadedly connected to the round nut, and the sealing sleeve is driven to translate on the external thread by the round nut.
[0007] Furthermore, the gap adjustment assembly also includes a winged gasket, which is located between the sealing sleeve and the round nut, and has an accommodating space for accommodating the round nut.
[0008] Furthermore, a sliding groove is provided on the external thread, the length direction of the sliding groove is consistent with the translation direction of the gap adjustment component, and the winged gasket includes inner wings, and the inner wings slide in the sliding groove.
[0009] Furthermore, the winged gasket also includes an outer wing, and the inner wing and the outer wing form the accommodating space; a fixing groove is provided on the outer side of the round nut, the outer wing is folded and embedded in the fixing groove, and the round nut is clamped in the accommodating space.
[0010] Furthermore, a positioning piece is provided between the sealing sleeve and the rotor to prevent relative rotation between the sealing sleeve and the rotor.
[0011] Furthermore, the positioning member uses at least one set screw.
[0012] Furthermore, the cross section of the sealing step in the longitudinal section along the axis is triangular.
[0013] Furthermore, the sealing comb teeth are arranged obliquely relative to the inner wall of the sealing shell.
[0014] Furthermore, the end of the sealing comb teeth is arranged opposite to the sealing step surface which is away from the leakage direction of the sealed gas.
[0015] A mechanical device is also provided, comprising a rotor, a casing and the labyrinth seal as claimed in claim 1.
[0016] A compressed air energy storage system is also provided, including a mechanical device using the above-mentioned labyrinth seal. One of the above-mentioned technical solutions has the following advantages or beneficial effects: the labyrinth seal of this solution can more accurately control the size of the sealing gap between the sealing comb teeth and the sealing step through the gap adjustment component, thereby increasing the along-the-way resistance and turbulent resistance of the leaking fluid, which not only avoids the occurrence of the "straight-through" effect of leakage in the prior art, but also can adjust the sealing gap during the installation process or after the installation is completed. Compared with the existing labyrinth seal, this solution can accurately adjust and control the sealing throttling gap, reducing the leakage amount of the labyrinth seal during use. Since the mechanical device of this solution can accurately adjust and control the sealing throttling gap, it can greatly reduce the leakage amount of the working fluid inside the equipment and improve the operating efficiency of the equipment. The compressed air energy storage system of this solution, due to the use of the above-mentioned labyrinth seal mechanical device, has the effect of accurately adjusting and controlling the sealing throttling gap, thereby improving the operating efficiency of the equipment and improving the power generation efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 : is a schematic diagram of assembling a labyrinth seal on an impeller device in an embodiment;
[0018] Figure 2 yes Figure 1 Sectional assembly drawing of
[0019] Figure 3 is a schematic structural diagram of a sealed housing in an embodiment;
[0020] Figure 4 is a schematic structural diagram of a sealing sleeve in an embodiment;
[0021] Figure 5 is a diagram illustrating the principle of a labyrinth seal in an embodiment;
[0022] Figure 6 is a schematic structural diagram of a gap adjustment assembly in an embodiment;
[0023] Figure 7 yes Figure 6 Parts diagram of the round nut;
[0024] Figure 8 yes Figure 6 Parts diagram of the middle finned gasket;
[0025] Fig. 9 It is a schematic diagram of the structure of a rotor that cooperates with a labyrinth seal.
[0026] In the figure: 10-sealing housing; 11-sealing comb teeth; 20-sealing sleeve; 21-sealing step; 22-O-ring; 23-fastening screw hole; 30-clearance adjustment assembly; 31-round nut; 311-fixing groove; 32-winged gasket; 321-inner wing; 322-outer wing; 33-fastening screw; 40-rotor; 41-external thread; 42-sliding groove. DETAILED DESCRIPTION
[0027] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.
[0028] Labyrinth seals are used in mechanical equipment containing rotors. In most mechanical equipment using labyrinth seals, there is a pressure difference on both sides of the rotor. For example, if the labyrinth seal is used at the end of the shaft, the inside of the casing is the high-pressure side, and the outside of the casing is the low-pressure side. If the labyrinth seal is used between the shafts, there is also a pressure difference between the two-stage working parts (such as the impeller). Since the labyrinth seal is a sealing structure between the rotating part and the stationary part, the basic condition for the installation of the labyrinth seal cannot interfere with the rotational relationship between the rotating part and the stationary part, and the sealing requirements are considered on this basis. Therefore, the existing labyrinth seal has a larger value of the throttling gap within the safety range during installation, and the throttling gap cannot be adjusted after installation. Once installed, it is difficult to further reduce the leakage.
[0029] like Figure 1-Figure 2 The labyrinth seal of this embodiment includes a sealing shell 10 fixed and connected to the stationary part, and a sealing sleeve 20 fixed and connected to the rotating part. When the labyrinth seal is used on a rotating fluid device, the sealing shell 10 is fixedly connected to the casing of the device, and the sealing sleeve 20 is fixedly connected to the rotor 40. The sealing shell 10 is connected to the casing and is relatively stationary. There are static seals such as gaskets (not shown in the figure) to ensure the seal, and there will be no leakage at this point. The sealing sleeve 20 and the rotor 40 are relatively stationary. There is at least one set of sealing members between the sealing sleeve 20 and the rotor 40 to form a seal to ensure that there will be no leakage between the sealing sleeve 20 and the rotor 40. The sealing member can be an O-ring 22. In order to facilitate the installation of the sealing shell 10 on the casing, the sealing shell 10 is divided into an upper and lower part.
[0030] Figure 3 A structure of a sealing shell 10 of this embodiment is shown, and sealing comb teeth 11 are arranged inside the sealing shell 10. Figure 4 FIG. 2 shows a structure of the sealing sleeve 20 of the present embodiment. The sealing sleeve 20 is provided with a sealing step 21, which is in a step shape or a sawtooth shape. Figure 2 The sealing comb teeth 11 cooperate with the sealing step 21 to form a throttling gap between the two. The throttling process in the throttling gap converts the pressure energy into kinetic energy, and the kinetic energy dissipation in the sealing cavity is converted into heat energy dissipation, so as to achieve sealing.
[0031] One of the reasons for the large leakage of existing labyrinth seals is the existence of a "straight-through" effect, that is, the sealed gas leaks directly from the gap between the end of the comb teeth and the rotor 40 to the outside without passing through the dissipation cavity between the sides of the comb teeth, resulting in a large leakage problem. In order to avoid the "straight-through" effect, such as Figure 5 As shown, the sealing step 21 on the sealing sleeve 20 of this embodiment has a triangular cross section in the longitudinal section along the axis. The leakage direction of the leaking fluid is from the inside of the casing to the outside of the casing. When leaking, it first passes through the sealing step 21 surface close to the casing. Since the longitudinal section of the sealing step 21 is triangular, the leakage channel formed by the sealing step 21 and the sealing comb teeth 11 is tortuous, which increases the resistance along the leakage fluid, avoids the occurrence of the "straight-through" effect, and further suppresses leakage.
[0032] Figure 5The arrow in represents the flow direction of the leaking fluid. Preferably, in order to further improve the sealing effect, the sealing comb teeth 11 of this embodiment cooperate with the sealing step surface that deviates from the leakage direction of the sealed gas, and there is a gap. Furthermore, one end of the sealing comb teeth connected to the sealing shell is the root of the sealing comb teeth, and the other end is the end of the sealing comb teeth, and the end of the sealing comb teeth is arranged opposite to the sealing step surface that deviates from the leakage direction of the sealed gas. Furthermore, the sealing comb teeth 11 are inclined relative to the inner wall of the sealing shell 10. From the longitudinal section of the extended axis, the acute angle between the sealing comb teeth 11 and the sealing step 21 surface that deviates from the leakage direction of the sealed gas is between 0° and 90°. Preferably, the sealing comb teeth 11 are arranged approximately vertically to the sealing step 21 surface that deviates from the leakage direction of the sealed gas from the longitudinal section of the extended axis.
[0033] The sealing principle of the labyrinth seal with adjustable gap in this embodiment is that the inclined sealing comb teeth 11 and the sealing sleeve 20 including the sealing step 21 rotate relatively, and a leakage channel exists between the two. Figure 5 The arrow in the figure represents the flow direction of the leakage fluid. The principle of suppressing leakage here is: the leakage fluid passes through the throttling gap between the inclined sealing comb teeth 11 and the sealing step 21, and the kinetic energy of the fluid increases. Then the leakage fluid enters the dissipation cavity. Since the space of the dissipation cavity is large and the shape is irregular, the leakage fluid generates a strong vortex here, which converts part of the kinetic energy of the fluid into pressure energy and heat energy. After the heat energy is dissipated, the total mechanical energy (the sum of kinetic energy and pressure energy) of the leakage fluid decreases, and then it enters the next sealing gap and dissipation cavity. The process is repeated to achieve the effect of suppressing leakage.
[0034] From the principle of suppressing leakage in this embodiment, it can be seen that when the throttling gap is reduced, the kinetic energy of the leaking fluid will increase when passing through this gap, and then the pressure energy and heat energy converted by the leaking fluid entering the dissipation cavity will increase, and the dissipated heat will increase. After the heat energy is dissipated, the mechanical energy of the leaking fluid will decrease accordingly. In other words, reducing the throttling gap can improve the sealing performance of the labyrinth seal. One method of reducing the throttling gap is to adjust the distance between the sealing step 21 and the sealing comb teeth 11. Based on this, a gap adjustment component 30 is provided between the sealing sleeve 20 and the rotor 40 of this embodiment. Figure 2 and Figure 6 A set of structures of the gap adjustment assembly 30 of this embodiment is shown, and the distance between the sealing step 21 on the sealing sleeve 20 and the sealing comb teeth 11 on the sealing housing 10 is adjusted by adjusting the gap adjustment assembly 30. Further, the gap adjustment group is arranged on the low-pressure side of the rotor 40, and the high-pressure side of the rotor 40 is the part of the rotor 40 located inside the casing.
[0035] like Figure 6A structure of the gap adjustment component 30 of this embodiment is: the gap adjustment component 30 includes a round nut 31 and a winged gasket 32, and the rotor 40 is provided with an external thread 41 corresponding to the round nut 31 and a sliding groove 42 corresponding to the winged gasket 32. Figure 7 A structure of the round nut 31 in this embodiment is shown. Figure 8 A structure of the finned gasket 32 in this embodiment is shown. Fig. 9 FIG. 4 shows a structure of the external thread 41 on the rotor 40 in this embodiment. Figure 6 The round nut 31 cooperates with the external thread on the shaft to adjust the position of the finned gasket 32 on the rotor 40. One side of the finned gasket 32 abuts against the end of the sealing sleeve 20, and the other side of the finned gasket 32 is used to fix the position of the round nut 31 on the rotor 40. In order to ensure the assembly of the finned gasket 32 and the round nut 31, as shown in FIG. Figure 6 As shown, the shaft diameter on the right side of the external thread 41 is smaller than the shaft diameter at the bottom of the sliding groove 42. Figure 8 The winged gasket 32 includes an inner wing 321 and an outer wing 322. The inner wing 321 and the outer wing 322 form a receiving space for receiving the round nut 31. Figure 7 , the outer side of the round nut 31 is provided with a fixing groove 311, and the inner side is threaded. When locked, the fixing groove 311 of the round nut 31 is clamped in the accommodation space formed by the inner wing 321 and the outer wing 322. The rotor 40 is provided with a sliding groove 42 matching the inner wing 321, and the inner wing 321 of the winged gasket 32 is embedded in the sliding groove 42 and slides in the sliding groove 42. The position of the winged gasket 32 on the rotor 40 is adjusted by sliding the inner wing 321 of the winged gasket 32 in the sliding groove 42. The adjustment process of the above-mentioned gap adjustment assembly 30 is as follows: after the position of the sealing sleeve 20 is determined, the winged gasket 32 enters from the sliding groove 42 on the rotor and abuts against the end of the sealing sleeve 20, and the position between the winged gasket 32 and the rotor 40 is determined. The round nut 31 is screwed into the external thread 41 on the rotor 40. When the side wall of the round nut 31 is pressed against the corresponding side wall of the winged gasket 32, the nearest outer wing 322 is folded and embedded in the fixing groove 311 of the nearest round nut 31, so that the round nut is located in the accommodation space formed by the inner wing and the outer wing of the winged gasket. Furthermore, the winged gasket 32 is provided with at least one outer wing and the round nut is provided with at least one fixing groove. When in use, the position of the round nut can be fine-tuned. When adjusting, the nearest outer wing 322 is folded and embedded in the fixing groove 311 closest to the round nut to fix the round nut.
[0036] like Figure 6When the position of the sealing sleeve 20 on the rotor 40 is determined by the gap adjustment component 30, the sealing sleeve 20 and the rotor 40 are fixed by the positioning member, which plays an auxiliary fixing role. The positioning member can use a set screw 33. At this time, at least one set screw 33 can be set, or multiple setscrews 33 are set symmetrically around the rotor 40, and are circumferentially distributed on the set screw holes 23 of the sealing sleeve 20. All the set screws 33 rotate with the rotor 40 and remain relatively still with the rotor 40. When the positioning member uses a set screw 33, the set screw 33 passes through the sealing sleeve 20, the end of the set screw 33 is against the rotor 40, and the top of the nut of the set screw 33 is flush with the surface of the sealing sleeve 20, or lower than the surface of the sealing sleeve 20. Furthermore, the end of the set screw 33 is against the rotor 40, and the end is the pressing surface of the set screw 33. Since the rotor 40 has a relatively high hardness and the sealing sleeve needs to be adjusted frequently, the set screw 33 of this embodiment uses a flat-end set screw, and its pressing surface should be a flat surface. Alternatively, the set screw 33 uses a concave-end set screw, and its pressing surface should be a concave surface. Of course, the positioning piece can also use an ordinary screw, and the sealing sleeve 20 is correspondingly provided with a threaded hole fixed with the ordinary screw.
[0037] When the casing is closed and the low-pressure side of the rotor 40 has adjustment space, the installation and adjustment method of the labyrinth seal of this embodiment is as follows: ① Connect and fix the sealing sleeve 20 to the rotor 40, and install the lower half of the sealing shell 10 on the lower casing. Put the sealing step 21 into the central axis of the sealing comb teeth 11, so that there is a relatively loose gap between the sealing step 21 and the sealing comb teeth 11, which is convenient for subsequent installation. ② Install the upper half of the sealing shell 10 on the upper casing, and buckle the upper casing and the sealing comb teeth 11 and the shell on the lower casing. ③ Manually adjust the axial position of the sealing sleeve 20 so that it contacts the inclined sealing comb teeth 11 and the sealing gap is zero. ④ Insert the inner wing 321 of the round nut 31 with the winged gasket 32 into the sliding groove 42 of the rotor 40, and then screw the round nut 31 on the external thread 41 of the rotor 40 until the round nut 31, the winged gasket 32 and the stepped sealing sleeve 20 contact in sequence. ⑤ By rotating the round nut 31 on the shaft of the rotor 40, the displacement of the stepped sealing sleeve 20 to the left can be controlled more accurately. When the position of the stepped sealing sleeve 20 is determined, the outer wing 322 of the winged gasket 32 is folded and embedded in the fixing groove 311 of the nut to fix the round nut 31, which indirectly locks the displacement of the sealing sleeve 20 to the right. Then, tighten the set screw 33 to lock the displacement of the sealing sleeve 20 to the left and the circumferential displacement, so that the sealing sleeve 20, O-ring 22, round nut 31 and winged gasket 32 can rotate with the shaft. ⑥ Manually turn the wheel to check the rotation of the rotor 40 and complete the installation.
[0038] If subsequent adjustments cannot be made after closing the upper casing, the position of the stepped sealing sleeve 20 can be adjusted first, and then the upper casing can be closed. At this time, the labyrinth seal of this embodiment has a second installation and adjustment method: install the sealing shell 10 of the lower half on the shaft hole of the lower casing, put the rotor 40 and the sealing sleeve 20 into the center axis of the sealing comb teeth 11, adjust the axial position of the sealing sleeve 20, and adjust the axial position of the stepped seal so that it contacts the inclined sealing comb teeth 11, so that the sealing gap is zero. ② Insert the round nut 31 into the sliding groove 42 of the rotor 40 with the inner wing 321 of the winged gasket 32, and then screw the round nut 31 on the external thread 41 of the rotor 40 until the round nut 31, the winged gasket 32 and the end of the sealing sleeve 20 contact in sequence. ③ By rotating the round nut 31 on the external thread 41 of the rotor 40, the displacement of the stepped sealing sleeve 20 to the left can be more accurately controlled. After the position of the stepped sealing sleeve 20 is determined, fold the outer wing 322 of the winged gasket 32 sandwiched between the round nut 31 and the stepped sealing sleeve 20 into a groove of the nut to fix the round nut 31, thereby indirectly locking the displacement of the stepped sealing sleeve 20 to the right. Then, tighten the set screw 33 to lock the displacement of the sealing sleeve 20 to the left and the circumferential displacement, so that the sealing sleeve 20, the O-ring 22, the round nut 31 and the winged gasket 32 can rotate with the shaft. ④ Manually turn the wheel to check the rotation of the rotor 40. ⑤ Buckle the upper casing and the sealing comb teeth 11 and the outer casing thereon onto the lower casing. ⑥ Manually turn the wheel again to check the rotation of the rotor 40 and complete the installation.
[0039] Furthermore, in order to improve the adjustment accuracy of the sealing gap, the pitch of the external thread 41 on the rotor 40 that cooperates with the round nut 31 can be further reduced while ensuring the structural rigidity, so that the axial progress of the round nut 31 per rotation is smaller. It is also possible to customize winged gaskets 32 of various specifications, and the use of winged gaskets 32 with smaller external wing angles or different thicknesses can more accurately lock the position of the round nut 31. Furthermore, when at least two external wings 322 are provided, setting the angles of adjacent external wings 322 smaller can also more accurately fix the position of the round nut 31. Furthermore, in order to avoid damage to the external thread 41 on the rotor 40, the thickness of the round nut 31 can be increased so that it covers the maximum protruding end of the external thread 41.
[0040] In summary, the labyrinth seal of the present embodiment is used for sealing between rotating parts and stationary parts in rotating fluid equipment. The gap adjustment component 30 can more accurately control the size of the sealing gap between the sealing comb teeth 11 and the sealing step, thereby increasing the along-the-way resistance and turbulent resistance of the leaking fluid, which not only avoids the occurrence of the "straight-through" effect of leakage in the prior art, but also allows the sealing gap to be adjusted during the installation process or after the installation is completed. Compared with the existing labyrinth seal, the labyrinth seal of the present embodiment can accurately adjust and control the sealing throttling gap, thereby reducing the leakage amount during the use of the labyrinth seal.
[0041] This embodiment also provides a compressed air energy storage system, which is a technology for electric energy storage. The compressed air energy storage system includes mechanical equipment using the above-mentioned labyrinth seal, for example, axial flow impeller equipment represented by compressors and expanders. In the compressed air energy storage system, the pressure difference between the two sides to be sealed is large. When the labyrinth seal of the prior art is used, there is a problem of large leakage, which makes it difficult to improve the power generation efficiency of the system. The mechanical equipment using the above-mentioned labyrinth seal in the compressed air energy storage system of this embodiment can accurately adjust and control the sealing throttling gap, greatly reducing the leakage of the working fluid inside the equipment, thereby improving the operating efficiency of the equipment and the power generation efficiency of the system. In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in specific circumstances.
[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.
Claims
1. A labyrinth seal, characterized in that: It includes a sealing shell fixed and connected to a stationary part and a sealing sleeve fixed and connected to a rotating part; the inner side wall of the sealing shell is provided with sealing comb teeth, the sealing sleeve is provided with a sealing step, and a throttling gap is formed between the sealing comb teeth and the sealing step; it also includes a gap adjustment component that enables the sealing sleeve to translate, and the size of the throttling gap is adjusted by adjusting the gap adjustment component.
2. The labyrinth seal according to claim 1, characterized in that: The gap adjustment assembly includes a round nut, and the rotating member is provided with an external thread threadedly connected to the round nut, and the sealing sleeve is driven to translate on the external thread by the round nut.
3. The labyrinth seal according to claim 2, characterized in that: The gap adjustment assembly also includes a finned gasket, which is located between the sealing sleeve and the round nut, and has an accommodating space for accommodating the round nut.
4. The labyrinth seal according to claim 3, characterized in that: The external thread is provided with a sliding groove, the length direction of the sliding groove is consistent with the translation direction of the gap adjustment component, and the winged gasket includes an inner wing, and the inner wing slides in the sliding groove.
5. The labyrinth seal according to claim 4, characterized in that: The winged gasket also includes an outer wing, and the inner wing and the outer wing form the accommodating space; a fixing groove is arranged on the outer side of the round nut, the outer wing is folded and embedded in the fixing groove, and the round nut is clamped in the accommodating space.
6. The labyrinth seal according to claim 1, characterized in that: A positioning piece is arranged between the sealing sleeve and the rotor to prevent relative rotation between the sealing sleeve and the rotor.
7. The labyrinth seal according to claim 6, characterized in that: The positioning member uses at least one set screw.
8. The labyrinth seal according to claim 1, characterized in that: The cross section of the sealing step in the longitudinal section along the axis is triangular.
9. The labyrinth seal according to claim 8, characterized in that: The sealing comb teeth are arranged obliquely relative to the inner wall of the sealing housing.
10. The labyrinth seal according to claim 9, characterized in that: The end of the sealing comb teeth is arranged opposite to the sealing step surface which is away from the leakage direction of the sealed gas.
11. A mechanical device, characterized in that: The mechanical device comprises a rotor, a casing and a labyrinth seal as described in any one of claims 1-10.
12. A compressed air energy storage system, characterized in that: The compressed air energy storage system includes a mechanical device using the labyrinth seal described in any one of claims 1-10.