An adjustable labyrinth sleeve structure

Abstract

The application relates to the technical field of fluid control valves, in particular to an adjustable labyrinth sleeve structure, which comprises a sleeve body, a labyrinth assembly and a sleeve gland, the labyrinth assembly is sleeved outside the sleeve body, the sleeve gland is fixedly arranged at the bottom of the sleeve body and abuts against the bottom surface of the labyrinth assembly, the middle of the sleeve body is provided with a valve core hole, the cylinder wall of the sleeve body is arranged with fluid small holes, the labyrinth assembly comprises a plurality of fixed disc pieces and movable disc pieces; the application comprises the fixed disc pieces and the movable disc pieces, the grooves on the fixed disc pieces and the movable disc pieces jointly form a labyrinth flow channel, and the labyrinth flow channel can be changed in applicability when the movable disc pieces rotate by a certain angle, so that the application can switch the labyrinth flow channel according to the gas pressure in the valve body during the installation and test stage, thereby adapting to the pressure values at different positions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid control valves, in particular to an adjustable labyrinth sleeve structure. BACKGROUND

[0002] Currently, in the application scene of large differential pressure bypass discharge valves, in order to realize the smooth and controllable discharge of medium under high pressure difference condition, a labyrinth sleeve assembly is usually arranged in the discharge valve. The labyrinth sleeve assembly converts the "violent discharge" of high pressure medium into a step-by-step throttling and smooth discharge state by building a labyrinth flow channel inside, effectively reduces the flow rate of the medium, suppresses the cavitation and scouring phenomena, and reduces the discharge noise, so it is widely used in pressure regulating systems in the fields of electric power, chemical industry and the like.

[0003] In the prior art, the labyrinth sleeve assembly usually adopts a stacked disc structure formed by stacking a plurality of discs. The discs are all processed with uniformly distributed tooth grooves or through holes, and the tooth grooves or through holes on adjacent discs are mismatched with each other to jointly form a complex labyrinth flow channel. When high pressure medium flows through the flow channel, it will be throttled and diverted for many times, and the pressure and flow rate will gradually decrease, thereby achieving the purpose of stable discharge.

[0004] However, in the actual application process, there is a certain difference in the pressure values at different positions in the pipeline system, and the labyrinth flow channel in the traditional labyrinth sleeve assembly is fixed and cannot dynamically adjust the flow channel resistance according to the change of gas pressure. Specifically, when the gas pressure is small, the fixed flow channel structure of the traditional labyrinth sleeve assembly will produce a large resistance, resulting in a too low flow rate of the medium, which is difficult to meet the discharge efficiency requirement of the system; and if the flow channel is designed to adapt to the low pressure condition, it is easy to cause problems such as too high flow rate and aggravated component wear at high pressure. Therefore, we propose an adjustable labyrinth sleeve structure to well solve the above-mentioned problems. SUMMARY

[0005] The present application aims to provide an adjustable labyrinth sleeve structure to solve the problems raised in the background.

[0006] The present application is realized by the following technical solutions:

[0007] An adjustable labyrinth sleeve structure, comprising a sleeve body, a labyrinth assembly and a sleeve gland, the labyrinth assembly is sleeved outside the sleeve body, the sleeve gland is fixedly arranged at the bottom of the sleeve body and abuts against the bottom surface of the labyrinth assembly, the middle of the sleeve body is a valve core hole, the cylinder wall of the sleeve body is arranged with fluid holes, the labyrinth assembly comprises a plurality of fixed discs and movable discs, the fixed discs and movable discs are both annular, the fixed discs and movable discs are alternately and sequentially stacked, and the movable discs can rotate around the center thereof;

[0008] The inner periphery of the fixed disc is arranged with inner tooth grooves as the entrance of the labyrinth flow channel, the outer periphery of the fixed disc is arranged with outer tooth grooves as the exit of the labyrinth flow channel, the inner tooth grooves and the outer tooth grooves correspond to each other, and a first transition hole is further arranged between the inner tooth groove and the outer tooth groove, and a second transition hole is further arranged on the surface of the fixed disc and beside the first transition hole;

[0009] The surface of the movable disc is radially spaced apart with two third transition holes, the inner periphery of the movable disc is arranged with inner through grooves as the entrance of the labyrinth flow channel, and the outer periphery of the movable disc is arranged with outer through grooves as the exit of the labyrinth flow channel; when the movable disc is in the first state, the two third transition holes are respectively located on the two sides of the first transition hole and between the inner tooth groove and the outer tooth groove, and the inner tooth groove, the outer tooth groove and the first transition hole are communicated with the two third transition holes, and the inner tooth groove is communicated with the fluid hole;

[0010] When the movable disc is in the second state, the inner through groove and the outer through groove are respectively located on the two sides of the second transition hole and communicated with the second transition hole, and the inner through groove is communicated with the fluid hole.

[0011] Optionally, the top outer side of the sleeve body is further sleeved with a disc top ring, the disc top ring is detachably fixedly connected between the sleeve body, and the bottom surface of the disc top ring abuts against the labyrinth assembly.

[0012] Optionally, the bottom surface of the disc top ring is provided with a first positioning rod in the axial direction of the sleeve body, a first positioning hole is formed through the fixed disc for the positioning rod to pass through, and a first arc-shaped groove is formed through the movable disc for the first positioning rod to pass through.

[0013] Optionally, the labyrinth assembly further comprises a abutting ring, the bottom surface of the abutting ring abuts against the top surface of the sleeve gland, and the top surface of the abutting ring further abuts against the movable disc.

[0014] Optionally, a hidden ring groove is formed in the outer peripheral wall of the abutting ring, a rotating ring is movably embedded in the hidden ring groove, the top surface of the rotating ring is provided with a driving rod in the axial direction of the sleeve body, a driving hole is formed through the movable disc for the driving rod to pass through, and a second arc-shaped groove is formed through the fixed disc for the driving rod to pass through.

[0015] Optionally, a third arc-shaped groove is formed through the top surface of the abutting ring for the driving rod to pass through.

[0016] Optionally, a abutting bolt is threadedly connected to the outer peripheral wall of the rotating ring, when the abutting bolt abuts against the inner ring wall of the hidden ring groove, the rotating ring is relatively fixed with the abutting ring.

[0017] Optionally, the sleeve gland comprises a gland body and a movable part elastically connected to the top surface of the gland body, and the inner annular wall of the gland body is provided with internal threads, and the gland body is threadedly connected with the bottom of the sleeve body.

[0018] Optionally, the movable part and the gland body are in axial sliding connection along the sleeve body, and the top surface of the movable part abuts against the abutting ring.

[0019] Optionally, the top surface of the movable part is provided with a limiting body, and the bottom surface of the abutting ring is provided with a limiting groove for embedding the limiting body.

[0020] Compared with the prior art, the present application provides an adjustable labyrinth sleeve structure, which has the following beneficial effects:

[0021] 1. The present application comprises a fixed disc and a movable disc, and the grooves on the fixed disc and the movable disc jointly form a labyrinth flow channel, and the labyrinth flow channel can be adaptively changed when the movable disc rotates by a certain angle, so that the present application can switch the labyrinth flow channel according to the gas pressure in the valve body during the installation and test stage, thereby adapting to the pressure values at different positions.

[0022] 2. The sleeve gland in the present application comprises a gland body and a movable part, and the movable part and the gland body are elastically connected, and the top surface of the movable part abuts against the disc, so that the present application can make the fitting tightness between the several discs moderate.

[0023] 3. The outer part of the abutting ring in the present application is sleeved with a rotating ring, the top surface of the rotating ring is provided with a driving rod, and the driving rod penetrates through the several movable discs, so that the present application can easily control the synchronous rotation of the several movable discs by rotating the rotating ring, and the operation mode is simple and reliable.

[0024] 4. The present application further comprises a gradual change groove on the surface of the fixed disc, and a positioning bump protruding and formed on the surface of the movable disc, and the positioning bump can be moved out of the gradual change groove by rotating the movable disc, so that there is a gap between the adjacent two discs, and the gas can easily flow out without passing through the labyrinth flow channel, thereby adapting to the low pressure working condition. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic view of the first embodiment of the present application.

[0026] Figure 2 It is a structural schematic view of the abutting ring of the first embodiment of the present application.

[0027] Figure 3 It is a structural schematic view of the fixed disc of the first embodiment of the present application.

[0028] Figure 4 It is a structural schematic view of the movable disc of the first embodiment of the present application.

[0029] Figure 5 Figure 1 is a schematic diagram of a first state of a moving disc according to an embodiment of the present application;

[0030] Figure 6 Figure 2 is a schematic diagram of a second state of a moving disc according to an embodiment of the present application;

[0031] Figure 7 Figure 3 is a schematic diagram of a first state of a moving disc according to another embodiment of the present application; Figure 1 Figure 4 is a schematic diagram of a first state of a moving disc according to another embodiment of the present application;

[0032] Figure 8 Figure 5 is a schematic diagram of a first state of a moving disc according to another embodiment of the present application; Figure 5 Figure 6 is a schematic diagram of a first state of a moving disc according to another embodiment of the present application;

[0033] Figure 9 Figure 7 is a schematic diagram of a first state of a moving disc according to another embodiment of the present application; Figure 6 Figure 8 is a schematic diagram of a first state of a moving disc according to another embodiment of the present application;

[0034] Figure 10 Figure 9 is a schematic diagram of a structure according to another embodiment of the present application;

[0035] Figure 11 Figure 10 is a schematic diagram of a structure according to another embodiment of the present application;

[0036] Figure 12 Figure 11 is a schematic diagram of a structure according to another embodiment of the present application;

[0037] Figure 13 Figure 12 is a schematic diagram of a structure according to another embodiment of the present application;

[0038] Figure 14 Figure 13 is a schematic diagram of a structure according to another embodiment of the present application; Figure 10 Figure 14 is a schematic diagram of a structure according to another embodiment of the present application.

[0039] In the figure: 100, sleeve body; 101, fluid hole; 200, labyrinth assembly; 201, fixed disc; 2011, inner tooth groove; 2012, outer tooth groove; 2013, first transition hole; 2014, second transition hole; 2015, first positioning hole; 2016, second arc-shaped groove; 2017, gradual change groove; 202, moving disc; 2021, third transition hole; 2022, inner through groove; 2023, outer through groove; 2024, first arc-shaped groove; 2025, driving hole; 2026, positioning bump; 203, abutting ring; 204, rotating ring; 205, driving rod; 206, abutting bolt; 207, first rod body; 300, sleeve gland; 301, gland body; 302, movable part; 303, limiting body; 400, disc top ring; 401, positioning rod; 402, driven ring; 403, second rod body. DETAILED DESCRIPTION

[0040] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0041] Embodiment one: please refer to Figure 1 Figure 9 The embodiment provides an adjustable labyrinth sleeve structure, which comprises a sleeve body 100, a labyrinth assembly 200 and a sleeve gland 300. The labyrinth assembly 200 is sleeved outside the sleeve body 100, the sleeve gland 300 is fixedly arranged at the bottom of the sleeve body 100 and abuts against the bottom surface of the labyrinth assembly 200, the middle of the sleeve body 100 is provided with a valve core hole, and the cylinder wall of the sleeve body 100 is arranged with fluid orifices 101. The top of the sleeve body 100 is protrudingly formed with an annular flange, and a disc top ring 400 is further sleeved outside the top of the sleeve body 100 and above the labyrinth assembly 200. The disc top ring 400 is detachably and fixedly connected between the sleeve body 100, and the bottom surface of the disc top ring 400 abuts against the labyrinth assembly 200. In this embodiment, the disc top ring 400 is fixedly connected with the sleeve body 100 in a threaded mode.

[0042] The specific structure of the labyrinth assembly 200 will be described below:

[0043] Specifically, the labyrinth assembly 200 comprises a plurality of fixed discs 201 and movable discs 202. The fixed discs 201 and the movable discs 202 are both annular and made of stainless steel. The fixed discs 201 and the movable discs 202 are alternately and sequentially stacked, and the movable discs 202 can rotate around the center thereof, while the fixed discs 201 cannot rotate relative to the sleeve body 100. The labyrinth assembly 200 further comprises a pressing ring 203. The bottom surface of the pressing ring 203 abuts against the top surface of the sleeve gland 300, and the top surface of the pressing ring 203 further abuts against the movable discs 202. Of course, since the fixed discs 201 and the movable discs 202 are alternately distributed, in another embodiment of the present application, the pressing ring 203 can also abut against the movable discs 202, which serves to keep the fixed discs 201 and the movable discs 202 closely attached.

[0044] ​Further, the inner periphery of the fixed disc 201 is arranged with inner tooth grooves 2011 as the entrance of the labyrinth flow channel, the outer periphery of the fixed disc 201 is arranged with outer tooth grooves 2012 as the exit of the labyrinth flow channel, the inner tooth grooves 2011 and the outer tooth grooves 2012 correspond to each other, and the first transition holes 2013 are further arranged between the inner tooth grooves 2011 and the outer tooth grooves 2012, and the second transition holes 2014 are further arranged on the surface of the fixed disc 201 and beside the first transition holes 2013; in this embodiment, the included angle between the centers of the adjacent two inner tooth grooves 2011 is about 30°, and the inner tooth grooves 2011, the outer tooth grooves 2012 and the first transition holes 2013 are arranged on the same straight line.

[0045] In addition, the surface of the movable disc 202 is radially spaced apart to be provided with two third transition holes 2021, the inner periphery of the movable disc 202 is arranged with inner through grooves 2022 as the entrance of the labyrinth flow channel, and the outer periphery of the movable disc 202 is arranged with outer through grooves 2023 as the exit of the labyrinth flow channel; the two third transition holes 2021 correspond to the inner tooth grooves 2011 and the outer tooth grooves 2012 on the fixed disc 201 respectively, and the inner through grooves 2022 and the outer through grooves 2023 correspond to the second transition holes 2014 on the fixed disc 201.

[0046] When the movable disc 202 is in the first state, the two third transition holes 2021 are located on the two sides of the first transition holes 2013 and between the inner tooth grooves 2011 and the outer tooth grooves 2012, and the inner tooth grooves 2011, the outer tooth grooves 2012 and the first transition holes 2013 are communicated with the two third transition holes 2021, and the inner tooth grooves 2011 are communicated with the fluid orifice 101; at this time, the gas in the sleeve body 100 can flow out in turn through the fluid orifice 101, the inner tooth grooves 2011, the third transition holes 2021, the first transition holes 2013, the third transition holes 2021 and the outer tooth grooves 2012.

[0047] When the movable disc 202 is in the second state, the inner through grooves 2022 and the outer through grooves 2023 are located on the two sides of the second transition holes 2014 and communicated with the second transition holes 2014, and the inner through grooves 2022 are communicated with the fluid orifice 101; at this time, the gas in the sleeve body 100 can flow out in turn through the fluid orifice 101, the inner through grooves 2022, the second transition holes 2014 and the outer through grooves 2023. Obviously, in the second state, the number of turning of the gas is less, that is, the flow resistance of the gas is smaller, which is suitable for the working condition with smaller pressure.

[0048] Specifically, in the embodiment, when the movable disc 202 is switched from the first state to the second state, the movable disc 202 only needs to rotate clockwise by about 5°~7°; conversely, when the movable disc 202 is switched from the second state to the first state, the movable disc 202 only needs to rotate counterclockwise by about 5°~7°. It should be noted that, in the embodiment, the fluid hole 101 has a diameter greater than the thickness of the movable disc 202 or the fixed disc 201, and in the first state and the second state, the inner tooth groove 2011 and the inner through groove 2022 can both communicate with the fluid hole 101. In the first state, the gas can only flow outwards with the inner tooth groove 2011 as the starting point of the labyrinth; in the second state, the gas can only flow outwards with the inner through groove 2022 as the starting point of the labyrinth.

[0049] In order to facilitate the adjustment of the angle of the movable disc 202, the following design is made in the embodiment:

[0050] Specifically, the bottom surface of the disc top ring 400 is provided with a positioning rod 401 along the axial direction of the sleeve body 100, the fixed disc 201 is provided with a first positioning hole 2015 through which the positioning rod 401 passes, and the movable disc 202 is provided with a first arc-shaped groove 2024 through which the positioning rod 401 passes. Since the position of the disc top ring 400 is fixed, i.e., the position of the positioning rod 401 is fixed, when the positioning rod 401 passes through the fixed disc 201, the position of the fixed disc 201 is also fixed.

[0051] In addition, the outer peripheral wall of the abutting ring 203 is provided with a hidden ring groove, a rotating ring 204 is movably embedded in the hidden ring groove, the top surface of the rotating ring 204 is provided with a driving rod 205 along the axial direction of the sleeve body 100, the movable disc 202 is provided with a driving hole 2025 through which the driving rod 205 passes, and the fixed disc 201 is provided with a second arc-shaped groove 2016 through which the driving rod 205 passes. The top surface of the abutting ring 203 is provided with a third arc-shaped groove 2031 through which the driving rod 205 passes. Since the driving rod 205 penetrates through a plurality of movable discs 202, when the user rotates the rotating ring 204, the plurality of movable discs 202 can be driven to rotate synchronously.

[0052] At the same time, the outer peripheral wall of the rotating ring 204 is threadedly connected with an abutting bolt 206, when the abutting bolt 206 abuts against the inner ring wall of the hidden ring groove, the rotating ring 204 is relatively fixed with the abutting ring 203. The rotating ring 204 has a bolt hole through which the abutting bolt 206 passes, by rotating the abutting bolt 206, the loosening and tightening of the rotating ring 204 can be controlled, so that the position of the movable disc 202 is prevented from being deviated in the non-adjusting state. It is worth mentioning that, since the inner diameter of the rotating ring 204 is smaller than the outer diameter of the abutting ring 203, the rotating ring 204 can be composed of two half rings that are spliced with each other; in addition, the bottom end of the driving rod 205 is screw-connected and fixed with the rotating ring 204.

[0053] In order to make the fitting tightness of the moving disc 202 and the fixed disc 201 appropriate, the following design is made in the embodiment.

[0054] The sleeve cover 300 comprises a cover body 301 and a movable part 302 elastically connected to the top surface of the cover body 301. The inner ring wall of the cover body 301 is provided with internal threads, and the cover body 301 is threadedly connected to the bottom of the sleeve body 100. The movable part 302 is annular and is in sliding connection with the cover body 301 along the axial direction of the sleeve body 100. A spring is arranged between the movable part 302 and the cover body 301, and the top surface of the movable part 302 abuts against the abutting ring 203.

[0055] In addition, the top surface of the movable part 302 is provided with a limiting body 303, and the bottom surface of the abutting ring 203 is provided with a limiting groove for embedding the limiting body 303. Since the limiting body 303 is embedded in the limiting groove, the abutting ring 203 and the movable part 302 cannot be twisted relative to each other. Since the spring always exerts an upward pushing force on the movable part 302, the movable part 302 can be tightly abutted against the bottom surface of the abutting ring 203, thereby fixing the abutting ring 203. It is worth mentioning that the greater the stiffness coefficient of the spring, the tighter the fitting of the moving disc 202 and the fixed disc 201, thereby causing the moving disc 202 to be difficult to rotate. Conversely, if the stiffness coefficient of the spring is too small, the fitting of the moving disc 202 and the fixed disc 201 can be insufficient, thereby causing air leakage. Therefore, in the embodiment, the stiffness coefficient of the spring is about 800 N / m.

[0056] In summary, when the state of the moving disc 202 needs to be adjusted, the abutting bolt 206 is loosened first, and then the rotating ring 204 is rotated to an appropriate angle. In this process, the driving rod 205 can drive the moving discs 202 to move synchronously. When the angle of the rotating ring 204 is adjusted, the abutting bolt 206 is tightened, and the state switching of the moving disc 202 is completed.

[0057] Embodiment two: please refer to Figure 10 - Figure 14In the embodiment, the surface of the fixed disc 201 is provided with at least two gradient grooves 2017 which are uniformly distributed, and the surface of the movable disc 202 is provided with positioning bumps 2026 which correspond to the gradient grooves 2017 and are embedded in the gradient grooves 2017. The depth of the gradient groove 2017 is greater than the height of the positioning bump 2026, so that the positioning bump 2026 can be embedded in the gradient groove 2017, and the fixed disc 201 and the movable disc 202 can still be attached to each other. In addition, the gradient groove 2017 has a slope at both ends, that is, the positioning bump 2026 can slide along the slope to the surface of the fixed disc 201, so that when the movable disc 202 rotates to the position where the positioning bump 2026 is away from the gradient groove 2017, the slope can reduce the rotating resistance of the movable disc 202.

[0058] Further, in the first state and the second state in the first embodiment, the positioning bump 2026 is located in the gradient groove 2017, and when the movable disc 202 continuously rotates, the positioning bump 2026 can be away from the gradient groove 2017. Specifically, if the initial state is the first state, when the movable disc 202 rotates clockwise more than 8°, the positioning bump 2026 can be away from the gradient groove 2017, and at this time, the adjacent two fixed discs 201 and the movable disc 202 have a gap, and the gas can be directly discharged through the gap without passing through the labyrinth flow channel, thereby greatly reducing the discharge resistance of the gas, so that this state can be suitable for the state with smaller gas pressure.

[0059] In order to accurately limit the positions of the fixed disc 201 and the movable disc 202, the embodiment is further provided with the following design: the top surface of the abutting ring 203 is vertically provided with a first rod body 207, the fixed disc 201 is provided with a through hole for the first rod body 207 to pass through, and the movable disc 202 is provided with an arc-shaped notch for the first rod body 207 to pass through. When the positioning bump 2026 is away from the gradient groove 2017, the overall thickness of the movable disc 202 and the fixed disc 201 increases, and at this time, the fixed disc 201 is either penetrated by the first rod body 207 or penetrated by the positioning rod 401, so that the angle of the fixed disc 201 can still be fixed.

[0060] On the other hand, the outer periphery of the disc top ring 400 is provided with an annular groove, and a driven ring 402 is rotatably arranged in the annular groove. The bottom surface of the driven ring 402 is vertically provided with a second rod body 403. The driving disc 202 is provided with a through hole for the second rod body 403 to pass through. The fixed disc 201 is provided with an arc-shaped notch for the second rod body 403 to pass through. The bottom surface of the disc top ring 400 is also provided with a notch for the second rod body 403 to pass through. When the driving rod 205 drives the plurality of driving discs 202 to rotate, the plurality of driving discs 202 are either penetrated by the second rod body 403 or the driving rod 205, and the plurality of driving discs 202 located in the middle part are penetrated by the second rod body 403 and the driving rod 205 at the same time. Therefore, the plurality of driving discs 202 can keep synchronous rotation.

[0061] It should be noted that due to the elastic connection between the movable part 302 and the gland body 301, when the positioning bump 2026 leaves the gradual change groove 2017, the movable part 302 will move downward by a certain distance to adapt to the increase in the overall thickness of the fixed disc 201 and the driving disc 202.

[0062] It should be noted that the adjustment function of the driving disc 202 in the embodiment is mainly used in the installation stage of the valve body. That is, during the installation process, the installation test needs to be performed to detect the gas pressure in the valve body, and then the rotary ring 204 is manually adjusted according to the pressure value so that the driving disc 202 is in a suitable state to adapt to the pressure value at different positions.

[0063] It should be noted that in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0064] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An adjustable labyrinth sleeve structure, comprising a sleeve body, a labyrinth assembly and a sleeve gland, the labyrinth assembly is sleeved on the outside of the sleeve body, the sleeve gland is fixedly arranged at the bottom of the sleeve body and abuts against the bottom surface of the labyrinth assembly, the middle of the sleeve body is a valve core hole, and the cylinder wall of the sleeve body is arranged with a fluid orifice, characterized in that: the labyrinth assembly comprises a plurality of fixed disc pieces and movable disc pieces, the fixed disc pieces and the movable disc pieces are annular, the fixed disc pieces and the movable disc pieces are alternately and sequentially stacked, and the movable disc pieces can rotate around the center thereof; the inner periphery of the fixed disc piece is arranged with an inner tooth groove as a labyrinth flow passage inlet, the outer periphery of the fixed disc piece is arranged with an outer tooth groove as a labyrinth flow passage outlet, the inner tooth groove and the outer tooth groove correspond to each other, and a first transition hole is further arranged between the inner tooth groove and the outer tooth groove, and a second transition hole is further arranged on the surface of the fixed disc piece and beside the first transition hole; the surface of the movable disc piece is radially and spaced apart to be provided with two third transition holes, the inner periphery of the movable disc piece is arranged with an inner through groove as a labyrinth flow passage inlet, and the outer periphery of the movable disc piece is arranged with an outer through groove as a labyrinth flow passage outlet; when the movable disc piece is in a first state, the two third transition holes are respectively located on the two sides of the first transition hole and between the inner tooth groove and the outer tooth groove, and the inner tooth groove, the outer tooth groove and the first transition hole are communicated with the two third transition holes, and the inner tooth groove is communicated with the fluid orifice; when the movable disc piece is in a second state, the inner through groove and the outer through groove are respectively located on the two sides of the second transition hole and communicated with the second transition hole, and the inner through groove is communicated with the fluid orifice; the top outside of the sleeve body is further sleeved with a disc top ring, the disc top ring is detachably and fixedly connected with the sleeve body, and the bottom surface of the disc top ring abuts against the labyrinth assembly; the bottom surface of the disc top ring is provided with a positioning rod along the axial direction of the sleeve body, a first positioning hole is formed through the fixed disc piece for the positioning rod to pass through, and a first arc-shaped groove is formed through the movable disc piece for the positioning rod to pass through; the labyrinth assembly further comprises an abutting ring, the bottom surface of the abutting ring abuts against the top surface of the sleeve gland, and the top surface of the abutting ring further abuts against the movable disc piece; the outer peripheral wall of the abutting ring is provided with a hidden ring groove, a rotating ring is movably embedded in the hidden ring groove, the top surface of the rotating ring is provided with a driving rod along the axial direction of the sleeve body, a driving hole is formed through the movable disc piece for the driving rod to pass through, and a second arc-shaped groove is formed through the fixed disc piece for the driving rod to pass through; the top surface of the abutting ring is provided with a third arc-shaped groove for the driving rod to pass through; the outer peripheral wall of the rotating ring is threadedly connected with an abutting bolt, when the abutting bolt abuts against the inner ring wall of the hidden ring groove, the rotating ring is relatively fixed with the abutting ring; the sleeve gland comprises a gland body and a movable part elastically connected to the top surface of the gland body, the inner ring wall of the gland body is provided with an inner thread, and the gland body is threadedly connected with the bottom of the sleeve body; the movable part and the gland body are slidably connected along the axial direction of the sleeve body, and the top surface of the movable part abuts against the abutting ring. ​ ​ ​ ​ 2. An adjustable labyrinth sleeve structure according to claim 1, characterized in that: ​ 3. An adjustable labyrinth sleeve structure according to claim 2, characterized in that: ​ 4. An adjustable labyrinth sleeve structure according to claim 1 or 3, characterized in that: ​ 5. An adjustable labyrinth sleeve structure according to claim 4, characterized in that: ​ 6. An adjustable labyrinth sleeve structure according to claim 5, characterized in that: ​ 7. An adjustable labyrinth sleeve structure according to claim 5, characterized in that: ​ 8. An adjustable labyrinth sleeve structure according to claim 4, characterized in that: ​ 9. An adjustable labyrinth sleeve structure according to claim 8, characterized in that: ​ 10. An adjustable labyrinth sleeve structure according to claim 9, characterized in that: The top surface of the movable part is provided with a limiting body, and the bottom surface of the abutting ring is provided with a limiting slot for embedding the limiting body.

Images