Dead-zone-free labyrinth disc and porous sleeve combined structure

Abstract

The utility model discloses a non-dead-zone labyrinth disc and porous sleeve combined structure, and relates to the field of valves. Under high-pressure, high-temperature and complex working conditions, a traditional labyrinth type sealing structure has the problems of high leakage rate, unreasonable pressure dissipation and the like. The labyrinth type assembly comprises a sleeve, a labyrinth type assembly and a sleeve gland, the labyrinth type assembly is formed by sequentially and alternately stacking labyrinth flow channel disc sets and spacing discs from top to bottom, each labyrinth flow channel disc set comprises an upper outer disc, a lower outer disc and a middle inner disc, each labyrinth flow channel disc set comprises independent labyrinth flow channel units which are arranged in a surrounding mode, and each labyrinth flow channel disc set comprises a plurality of labyrinth flow channel units which are arranged in a surrounding mode. Each labyrinth flow channel unit is provided with multiple stages of flow channel buffering cavities from inside to outside, the inner peripheries of the spacing discs are attached to the outer peripheral face of the sleeve, and circumferential buffering flow channel grooves are formed in the inner peripheries of the labyrinth flow channel disc sets. The structure ensures that fluid flows along a radial preset path, vertical turbulent flow and axial impact are avoided, uniform distribution and reasonable pressure gradient dissipation are achieved, the sealing stability is effectively improved, and the leakage risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to a combination structure of a labyrinth disc without dead zone and a porous sleeve. Background Technology

[0002] In the field of fluid sealing technology under high pressure, high temperature, and complex operating conditions, traditional labyrinth seal structures have many technical defects that urgently need to be addressed. In existing technologies, labyrinth seal devices typically employ a simple stacked disc structure, resulting in a single fluid path and numerous dead zones, leading to high media leakage rates. For example, traditional disc arrangements cannot form effective multi-stage buffer chambers, and high-pressure fluids are prone to sudden velocity changes when flowing through the sealing area, causing vibration and impact, and accelerating fatigue damage to the seals.

[0003] Furthermore, the traditional connection method between the sleeve and the disc assembly is too rigid, making it difficult to ensure coaxiality. This leads to uneven stress distribution at the sealing interface, further exacerbating the risk of leakage. At the same time, the existing technology lacks a coordinated optimization design for the fluid orifice location and the disc structure, preventing uniform distribution and proper dissipation of pressure gradients when the fluid enters the labyrinth flow channel, thus limiting the improvement of sealing performance.

[0004] With the increasing demands for valve sealing reliability in industries such as petrochemicals and nuclear power, the shortcomings of traditional labyrinth seal structures in terms of dead zone control, vibration resistance, and pressure dissipation are becoming increasingly apparent. There is an urgent need to develop a new combination structure of dead zone-free labyrinth discs and porous sleeves to meet the sealing requirements under complex working conditions. Utility Model Content

[0005] The technical problem to be solved and the technical task proposed by this utility model is to improve and refine existing technical solutions, and to provide a combination structure of a dead-zone-free labyrinth disc and a porous sleeve, so as to achieve uniform distribution of fluid and reasonable dissipation of pressure gradient when the fluid enters the labyrinth flow channel, thereby improving the reliability of the seal. To this end, this utility model adopts the following technical solution.

[0006] A dead-zone-free labyrinth disc and porous sleeve combination structure includes a sleeve, a labyrinth assembly, and a sleeve cap. The labyrinth assembly is connected and fixed to the outside of the sleeve via the sleeve cap. The sleeve has a valve core hole in the middle, and fluid holes are arranged on the sleeve wall to communicate with the inner inlet of the labyrinth assembly. The labyrinth assembly includes a labyrinth flow channel disc group and spacer discs. The labyrinth flow channel disc group and spacer discs are stacked alternately from top to bottom, so that the spacer discs isolate two adjacent labyrinth flow channel disc groups. Each labyrinth flow channel disc group includes multiple independent labyrinth flow channel units arranged in a circle as internal and external fluid passages. Each labyrinth flow channel unit has multiple flow channel buffer cavities from the inside to the outside. The inner circumference of the spacer disc is in contact with the outer circumference of the sleeve. A circumferential buffer flow channel groove is provided between the inner circumference of the labyrinth flow channel disc group and the outer circumference of the sleeve.

[0007] The radial introduction and circumferential distribution of fluid are achieved through the connection structure between the fluid orifice in the sleeve wall and the inner inlet of the labyrinth component, eliminating the sealing dead zone in traditional structures. The interactive stacking of the labyrinth flow channel disc assembly and the spacer discs forms a multi-stage flow channel buffer chamber, allowing the fluid to undergo multiple expansion-contraction processes during passage, effectively dissipating energy and reducing leakage rate. The fit between the spacer discs and the outer circumference of the sleeve, as well as the setting of the inner circumferential gap of the disc assembly, improves sealing stability. Furthermore, the spacer discs effectively isolate adjacent labyrinth flow channel units, ensuring that the fluid only undergoes multi-stage buffered flow radially from the inside out along a predetermined path, avoiding turbulence caused by vertical flow impact, reducing the axial physical impact of the fluid on the labyrinth flow channel disc assembly, and enabling uniform distribution of fluid and reasonable dissipation of pressure gradient when entering the labyrinth flow channel, effectively improving sealing stability.

[0008] As a preferred technical approach, the fluid orifices are located vertically between two adjacent spacer discs. This avoids direct fluid impact on the circumferential surface of the spacer discs, reducing wear and vibration caused by fluid impact and extending the sealing life of the spacer discs. In addition, the fluid directly enters the inner circumferential gap of the labyrinth flow channel disc assembly, allowing the fluid to enter the labyrinth flow channel unit more effectively, optimizing pressure distribution and improving overall sealing efficiency.

[0009] As a preferred technical means: each labyrinth flow channel disc assembly includes two outer discs (upper and lower) and an inner disc located between the two outer discs. The inner circumference of the outer discs is arranged with internal toothed grooves serving as the inlet of the labyrinth flow channel, and the outer circumference of the outer discs is arranged with external toothed grooves serving as the outlet of the labyrinth flow channel. An axially penetrating outer disc transition hole is arranged between the internal and external toothed grooves. The inner disc is arranged with vertically penetrating inner disc transition holes, including those located radially inward. The inner transition hole and the outer transition hole located radially outwards, along with one vertically overlapping inner toothed groove on each of the upper and lower outer discs in each labyrinth flow channel unit, serve as the fluid inlet. The inner toothed grooves of the upper and lower outer discs, the inner transition hole of the middle inner disc, the outer transition holes of the upper and lower outer discs, the outer transition holes of the middle inner disc, and the outer toothed grooves of the upper and lower outer discs sequentially overlap and connect in adjacent areas from the inside out, forming a labyrinth flow channel unit with multi-stage flow channel buffer cavities for internal and external flow. This achieves multi-stage fluid redirection and energy dissipation. The independent labyrinth flow channel unit structure isolates fluid paths, avoids crosstalk, and enhances sealing reliability.

[0010] As a preferred technical approach: the inner disc, outer disc, and spacer disc have the same outer diameter; the inner disc and outer disc have the same inner diameter; and the inner diameter of the inner disc and outer disc is 2-5 mm larger than the inner diameter of the spacer disc. The identical outer diameter of each disc ensures the coaxiality of the overall structure, reducing the risk of leakage due to assembly deviations. The inner diameter of the inner disc and outer disc being 2-5 mm larger than the inner diameter of the spacer disc allows for reasonable optimization of the circumferential buffer channel groove size, further reducing fluid velocity, achieving a smooth transition of the pressure gradient, and resulting in good fluid decompression.

[0011] As a preferred technical approach: each inner disc inner transition hole is an isosceles trapezoidal hole; each inner disc outer transition hole includes two symmetrical right-angled trapezoidal single holes with adjacent right-angled sides; each outer disc transition hole includes two symmetrical right-angled trapezoidal single holes with adjacent right-angled sides; the outer width of each single hole on the radially outer side of the disc is greater than the inner width on the inner side; the outer tooth groove includes two symmetrical single grooves, the groove width of the outer tooth groove is greater than or equal to the outer width of the single hole of the inner disc outer transition hole, and the inner width of the single hole of the inner disc outer transition hole is greater than or equal to the inner width of the single hole of the inner disc outer transition hole. The outer width of a single hole in the outer disk transition hole is greater than or equal to the outer edge length of the inner transition hole in the inner disk. Within the same labyrinth flow channel unit, the outer region of the inner transition hole in the inner disk overlaps and connects with the inner regions of the two single holes in the outer disk transition hole; the outer regions of the two single holes in the outer disk transition hole overlap and connect with the single holes of their respective inner disk outer transition holes; and the outer regions of the two single holes in the inner disk outer transition hole overlap and connect with the inner regions of their respective outer toothed grooves. This creates an energy dissipation structure with a gradually expanding area for fluid entry, buffering, and outflow, achieving better pressure reduction.

[0012] As a preferred technical approach, the thickness of the inner disc is 1.4-1.6 times the thickness of the outer disc. The thickness of the inner disc is greater than the thickness of a single outer disc but less than the thickness of two outer discs. This ensures that the size of the fluid transition orifice in the inner disc is within a reasonably optimized range. This avoids the situation where the fluid transition orifice is too small, leading to excessively high fluid velocity, drastic pressure gradient changes, and potential turbulence and localized high-pressure impacts. Conversely, it also avoids the situation where the transition orifice is too large, resulting in prolonged fluid residence time and the potential formation of eddy current dead zones.

[0013] As a preferred technical approach: the diameter of the fluid orifice is less than or equal to the thickness of the labyrinth channel disc assembly, and the diameter of the fluid orifice is greater than or equal to the sum of the thicknesses of the two outer discs. The size of the fluid orifice is within a reasonable and optimized range to ensure that the fluid entry velocity matches the circumferential buffer cavity inside the labyrinth channel disc assembly and the inlet of the labyrinth channel unit, achieving an optimized match between fluid flow rate and sealing effect.

[0014] As a preferred technical means: the upper outer periphery of the sleeve is provided with an upper inverted annular step and a lower inverted annular step, the lower inverted annular step being located below and inside the upper inverted annular step; the upper end of the labyrinth-type component is in contact with the inverted step surface of the lower inverted annular step; the lower end of the labyrinth-type component abuts against the upper end surface of the sleeve cap; and the inner periphery of the sleeve cap is fixed to the outer periphery of the bottom of the sleeve by a threaded connection. This effectively achieves the fixation of the labyrinth-type component.

[0015] As a preferred technical means, the labyrinth-type assembly further includes a disk top ring and a disk bottom ring. The disk top ring is located at the upper end of the labyrinth channel disk assembly and the spacer disk stack, and the disk bottom ring is located at the lower end of the labyrinth channel disk assembly and the spacer disk stack. The disk bottom ring, disk top ring, labyrinth channel disk assembly, and spacer disk stack are connected and positioned by multiple circumferentially arranged cylindrical pins, and are fastened by multiple circumferentially arranged long bolts. This effectively achieves precise assembly of the labyrinth-type assembly. The fastening of the disk top ring and disk bottom ring by cylindrical pins and long bolts enhances the overall structural rigidity, preventing disk displacement or loosening under high pressure. The circumferential arrangement of the connection ensures uniform stress distribution, improving the vibration resistance and reliability of the sealing assembly.

[0016] As a preferred technical means: the upper end face of the sleeve cap is provided with an annular groove, the tail of the long bolt is located in the annular groove, and the head of the long bolt and the upper end of the cylindrical pin are both lower than the upper end face of the disc top ring in the height direction. The annular groove can accommodate the tail of the long bolt on the one hand, and on the other hand, it will not collide with the tail of the long bolt when the sleeve cap is screwed and fixed, making the structure simpler and more compact. The head of the long bolt and the upper end of the cylindrical pin are lower than the end face of the disc top ring, ensuring a tight fit between the disc top ring and the lower inverted annular step, so that the labyrinth assembly is stably and firmly fixed on the sleeve.

[0017] Beneficial effects: This combined structure effectively eliminates the sealing dead zone in traditional structures. The interactive stacking of the labyrinth flow channel disc assembly and the spacer discs forms a multi-stage flow channel buffer chamber, allowing the fluid to undergo multiple expansion-contraction processes during passage, effectively dissipating energy and reducing leakage rate. The fit between the spacer discs and the outer circumference of the sleeve, as well as the setting of the inner circumference gap of the disc assembly, improves sealing stability. Furthermore, the spacer discs effectively isolate adjacent labyrinth flow channel units, ensuring that the fluid only undergoes multi-stage buffered flow radially from the inside out along a predetermined path, avoiding turbulence caused by vertical flow impact, reducing the axial physical impact of the fluid on the labyrinth flow channel disc assembly, and enabling the fluid to be evenly distributed and the pressure gradient to be reasonably dissipated when entering the labyrinth flow channel, effectively improving sealing stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the isometric structure of this utility model.

[0020] Figure 3 This is a utility model Figure 1 Schematic diagram of sectional view AA.

[0021] Figure 4 This is a top view of the labyrinth flow channel disc assembly with stacked, spaced discs in this utility model.

[0022] Figure 5 This is a utility model Figure 3 Schematic diagram of the cross-section of BB.

[0023] Figure 6 This is a schematic diagram of the outer disc in this utility model.

[0024] Figure 7 This is a schematic diagram of the inner disk in this utility model.

[0025] Figure 8 This is a schematic diagram of the stacking of the outer and inner disks in this utility model.

[0026] Figure 9 This is a schematic diagram of the labyrinth-type component in this utility model.

[0027] Figure 10 This is a utility model Figure 9 Enlarged schematic diagram of section C.

[0028] In the diagram: 1. Sleeve; 2. Labyrinth assembly; 3. Sleeve cap; 101. Upper inverted annular step; 102. Lower inverted annular step; 103. Valve core hole; 104. Fluid orifice; 201. Spacer disc; 202. Outer disc; 20201. Inner tooth groove; 20202. Outer tooth groove; 20203. Outer disc transition hole; 203. Inner disc; 204. Disc bottom ring; 205. Disc top ring; 206. Cylindrical pin; 207. Long bolt; 20301. Inner disc inner transition hole; 20302. Inner disc outer transition hole; 204. Circumferential buffer channel groove; 205. Labyrinth channel unit. Detailed Implementation

[0029] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings.

[0030] Example 1

[0031] like Figures 1-5As shown, a combination structure of a dead-zone-free labyrinth disc and a porous sleeve 1 includes a sleeve 1, a labyrinth component 2, and a sleeve cap 3. The upper outer periphery of the sleeve 1 is provided with two inverted steps, namely an upper inverted annular step 101 and a lower inverted annular step 102 located below and inside the upper inverted annular step 101. The upper inverted annular step 101 is used to install the sleeve 1. The labyrinth component 2 is sleeved on the sleeve 1. The upper end of the labyrinth component 2 is in contact with the inverted step surface of the lower inverted annular step 102. The lower end of the labyrinth component 2 abuts against the upper end surface of the sleeve cap 3. The inner periphery of the sleeve cap 3 is fixed to the bottom outer periphery of the sleeve 1 by a threaded connection. The lower end of the sleeve cap 3 is welded around the lower end of the bottom outer periphery of the sleeve 1 at the adjacent position. The labyrinth-type component 2 includes a labyrinth flow channel disc assembly and a spacer disc 201. The labyrinth flow channel disc assembly and the spacer disc 201 are stacked alternately from top to bottom, with the spacer disc 201 isolating two adjacent labyrinth flow channel disc assemblies. The inner circumference of the spacer disc 201 is in contact with the outer circumference of the sleeve 1. Each labyrinth flow channel disc assembly includes two outer discs 202 and an inner disc 203 located between the two outer discs 202. The outer diameters of the inner disc 203, outer discs 202, and spacer disc 201 are the same. The same outer diameter of each disc ensures the coaxiality of the overall structure and reduces the risk of leakage caused by assembly deviations. The inner diameters of the inner disc 203 and outer discs 202 are the same, and the inner diameters of the inner disc 203 and outer discs 202 are 3mm larger than the inner diameter of the spacer disc 201, forming a 3mm circumferential buffer flow channel groove 204 on the inner circumference of the labyrinth flow channel disc assembly. The upper and lower sides of the circumferential buffer channel groove 204 are separated by spacer discs 201, making the channels of adjacent labyrinth channel disc groups independent of each other. The sleeve 1 has a vertical valve core hole 103 in the middle. The fluid flow rate is controlled by the depth of the valve core within the valve core hole 103. Radial through-holes 104 are arranged around the outer periphery of the sleeve 1 of the valve core hole 103 to communicate with the circumferential buffer channel groove 204 on the inner periphery of the labyrinth channel disc group. The vertical distribution range of the fluid holes 104 is consistent with the vertical distribution range of the labyrinth channel disc group. Each labyrinth channel disc group includes multiple independent labyrinth channel units 205 arranged in a circular pattern as internal and external fluid passages. Each labyrinth channel unit 205 has multiple levels of buffer chambers from the inside out, and the inner side of each level of buffer chamber communicates with the circumferential buffer channel groove 204. The multi-stage flow channel buffer cavity of circumferential buffer channel groove 204 and labyrinth flow channel unit 205 further reduces the fluid velocity, achieves a smooth transition of pressure gradient, and has a good fluid decompression effect.

[0032] To achieve the independent labyrinth flow channel unit 205 structure, such as Figure 6As shown, the inner circumference of the outer disc 202 is surrounded by inner toothed grooves 20201, which serve as the inlet of the labyrinth flow channel, and the outer circumference of the outer disc 202 is surrounded by outer toothed grooves 20202, which serve as the outlet of the labyrinth flow channel. An axially penetrating outer disc transition hole 20203 is arranged between the inner toothed grooves 20201 and the outer toothed grooves 20202. Figure 7 As shown, vertically penetrating inner disk transition holes are arranged around the inner disk 203. These transition holes include an inner disk inner transition hole 20301 located radially inward and an outer disk outer transition hole 20302 located radially outward. In each labyrinth flow channel unit 205, one vertically overlapping inner tooth groove 20201 on each of the upper and lower outer disks 202 serves as the fluid inlet connecting the labyrinth flow channel unit 205 to the circumferential buffer flow channel groove 204. The inner tooth grooves 20201 of the upper and lower outer disks 202, the inner disk inner transition hole 20301 of the middle inner disk 203, the outer disk transition holes 20203 of the upper and lower outer disks 202, the inner disk outer transition hole 20302 of the middle inner disk 203, and the outer tooth grooves 20202 of the upper and lower outer disks 202 are sequentially overlapped and connected in adjacent areas from the inside out, forming a labyrinth flow channel unit 205 with multi-stage flow channel buffer cavities for internal and external flow. Figure 8 As shown. This achieves multi-stage fluid redirection and energy dissipation. The independent labyrinth flow channel unit 205 structure isolates fluid paths from each other, avoiding crosstalk and enhancing sealing reliability.

[0033] To achieve a better pressure reduction gradient effect, each inner disk inner transition hole 20301 is an isosceles trapezoidal hole, and each inner disk outer transition hole 20302 includes two symmetrical right-angled trapezoidal single holes, with the right-angled sides of the two single holes adjacent; each outer disk transition hole 20203 includes two symmetrical right-angled trapezoidal single holes, with the right-angled sides of the two single holes adjacent. The outer width of each single hole on the radially outer side of the disk is greater than the inner width. The outer toothed groove 20202 includes two symmetrical single grooves, and the groove width of the single groove of the outer toothed groove 20202 is greater than or equal to the outer width of the single hole of the inner disk outer transition hole 20302. The inner width of the single hole of the inner disk outer transition hole is equal to the outer width of the single hole of the inner disk outer transition hole 20302 outer. The outer width of a single hole in the outer disk transition hole 20203 is equal to the outer length of the inner disk inner transition hole 20301. Within the same labyrinth flow channel unit 205, the outer region of the inner disk inner transition hole 20301 overlaps and connects with the inner regions of the two single holes in the outer disk transition hole 20203. The outer regions of the two single holes in the outer disk transition hole 20203 overlap and connect with the single holes of their respective inner disk outer transition holes 20302. The outer regions of the two single holes in the inner disk outer transition holes 20302 overlap and connect with the inner regions of the single grooves of their respective outer toothed grooves 20202. This creates an energy dissipation structure with a gradually expanding area for fluid entry, buffering, and outflow, achieving a better pressure reduction gradient effect.

[0034] In this embodiment, the inner disc 203 has a thickness of 3 mm, and the outer disc 202 has a thickness of 2 mm. The thickness of the inner disc 203 is 1.5 times that of the outer disc 202. The thickness of the inner disc 203 is greater than the thickness of a single outer disc 202 but less than the thickness of two outer discs 202. This ensures that the size of the fluid transition hole in the inner disc 203 is within a reasonably optimized range. It avoids the situation where the fluid transition hole is too small, leading to excessively high fluid velocity, drastic pressure gradient changes, and potential turbulence and localized high-pressure impacts. Conversely, it avoids the situation where the transition hole is too large, resulting in prolonged fluid residence time and the potential formation of eddy current dead zones. The spacer disc 201 has a thickness of 1.5 mm. As a separator, the thickness of the spacer disc 201 can be relatively thin.

[0035] In this embodiment, the diameter of the fluid orifice 104 is 4 mm, which is equal to the thickness of the two outer discs 202 of the labyrinth flow channel disc assembly. The size of the fluid orifice 104 is within a reasonable optimization range to ensure that the fluid entry velocity matches the circumferential buffer cavity inside the labyrinth flow channel disc assembly and the inlet of the labyrinth flow channel unit 205, achieving an optimized match between fluid flow rate and sealing effect.

[0036] like Figure 3 , Figure 5 During operation, the valve core adjusts the number of fluid orifices 104 opened by raising and lowering within the valve core hole 103. Fluid enters the fluid orifice 104 through the valve core hole 103, then enters the circumferential buffer channel groove 204, and from the circumferential buffer channel groove 204 enters the inner toothed groove 20201, which serves as the inlet of a labyrinth flow channel. The fluid flows in through the inlet of the inner toothed groove 20201 of the upper and lower outer discs 202, and then converges through the overlapping and penetrating area into the inner transition hole 20301 of the middle inner disc 203. From the inner transition hole 20301, the fluid is then split upwards and downwards through the overlapping and penetrating area to the outer transition hole 20203. From the outer transition hole 20203, the fluid flows into the outer transition hole 20302 of the inner disc through the overlapping and penetrating area, and then flows out through the outer toothed groove 20202, which serves as the outlet of the labyrinth flow channel.

[0037] The radial introduction and circumferential distribution of fluid are achieved through the communication structure between the fluid orifice 104 on the wall of sleeve 1 and the inner inlet of the labyrinth component 2, eliminating the sealing dead zone in traditional structures. The interactive stacking of the labyrinth flow channel disc assembly and the spacer discs 201 forms a multi-stage flow channel buffer chamber, allowing the fluid to undergo multiple expansion-contraction processes during passage, effectively dissipating energy and reducing leakage rate. The fit between the spacer discs 201 and the outer circumferential surface of sleeve 1, and the setting of the circumferential buffer flow channel grooves 204 on the inner circumference of the disc assembly, effectively isolate adjacent labyrinth flow channels. Furthermore, the spacer discs 201 ensure that the fluid only undergoes multi-stage buffered flow radially from the inside out along a predetermined path, avoiding turbulence caused by vertical flow impact, reducing the axial physical impact of the fluid on the labyrinth flow channel disc assembly, effectively improving sealing stability, and ensuring uniform distribution and reasonable dissipation of pressure gradient when the fluid enters the labyrinth flow channel. This reduces leakage risk and is suitable for fluid sealing under complex conditions such as high pressure and high temperature, with broad application prospects in petrochemical, nuclear power and other fields.

[0038] Example 2

[0039] Unlike Embodiment 1, the fluid orifices 104 are located vertically between two adjacent spacer discs 201. This avoids direct fluid impact on the inner circumferential surface of the spacer discs 201, reducing wear and vibration caused by fluid impact and extending the sealing life of the spacer discs 201. In addition, the fluid can directly enter the inner circumferential gap of the labyrinth flow channel disc assembly, allowing the fluid to enter the labyrinth flow channel unit 205 more effectively, optimizing pressure distribution and improving overall sealing efficiency.

[0040] Example 3

[0041] Unlike Embodiment 1 or 2, as Figure 3 , Figure 9 , Figure 10As shown, the labyrinth assembly 2 also includes a disk top ring 205 and a disk bottom ring 204. The disk top ring 205 is located at the upper end of the labyrinth channel disk assembly and the stack of spacer disks 201, and the disk bottom ring 204 is located at the lower end of the labyrinth channel disk assembly and the stack of spacer disks 201. The disk bottom ring 204, the disk top ring 205, the labyrinth channel disk assembly, and the stack of spacer disks 201 are connected and positioned by ten evenly distributed cylindrical pins 206, and are fastened by five evenly distributed long bolts 207. The heads of the long bolts 207 are all fixed in the threaded holes of the disk top ring 205. The upper end face of the sleeve cap 3 is provided with an annular groove, and the tail of the long bolt 207 is located in the annular groove. The heads of the long bolts 207 and the upper ends of the cylindrical pins 206 are both lower than the upper end face of the disk top ring 205 in terms of height. The labyrinth assembly 2 is precisely assembled. The disc top ring 205 and disc bottom ring 204 are fastened by cylindrical pins 206 and long bolts 207, enhancing the overall structural rigidity and preventing the disc from shifting or loosening under high pressure. The circumferential arrangement of the connection ensures uniform stress distribution, improving the vibration resistance and reliability of the sealing assembly. The annular groove can accommodate the tail of the long bolt 207, and it will not collide with the tail of the long bolt 207 when the sleeve cap 3 is tightened, making the structure simpler and more compact. The head of the long bolt 207 and the upper end of the cylindrical pin 206 are lower than the end face of the disc top ring 205, ensuring a tight fit between the disc top ring 205 and the lower inverted annular step 102, so that the labyrinth assembly 2 is stably and firmly fixed on the sleeve 1. Compared to directly fixing the labyrinth flow channel disk assembly and spacer disk 201 to the sleeve 1, by setting the disk top ring 205 and disk bottom ring 204, the labyrinth component 2 forms an independent encapsulated structure, making it easier to move and assemble.

[0042] The above-described combination structure of a dead-zone-free maze disc and a porous sleeve 1 is a specific embodiment of this utility model, which embodies the substantial features and progress of this utility model. Based on actual usage needs, equivalent modifications in shape, structure, etc., can be made to it under the guidance of this utility model, all of which are within the protection scope of this solution.

Claims

1. A dead-band-free labyrinth disk and multi-hole sleeve combination, characterized by: The application relates to a valve sleeve, a labyrinth assembly and a sleeve gland, wherein the labyrinth assembly is fixed to the outside of the sleeve through the sleeve gland; the middle of the sleeve is provided with a valve core hole; the sleeve wall is provided with fluid small holes to communicate with the inside inlet of the labyrinth assembly; the labyrinth assembly comprises a labyrinth flow channel disc group and a spacing disc; the labyrinth flow channel disc group and the spacing disc are alternately stacked from top to bottom; the spacing disc separates the upper and lower two labyrinth flow channel disc groups; each labyrinth flow channel disc group comprises a plurality of independent labyrinth flow channel units arranged around and serving as the inside and outside fluid passages; each labyrinth flow channel unit is provided with a plurality of levels of flow channel buffer cavities from inside to outside; the inner periphery of the spacing disc is attached to the outer periphery of the sleeve; and the circumferential buffer flow channel groove is arranged between the inner periphery of the labyrinth flow channel disc group and the outer periphery of the sleeve.

2. A dead band labyrinth disc and porous sleeve combination according to claim 1, wherein: The fluid small holes are located between the upper and lower two spacing discs in the height direction.

3. A dead band labyrinth disc and porous sleeve combination according to claim 2, wherein: Each labyrinth flow channel disc group comprises two upper and lower outer discs and one inner disc between the two outer discs; the inner periphery of the outer disc is arranged around the inner tooth groove serving as the labyrinth flow channel inlet; the outer periphery of the outer disc is arranged around the outer tooth groove serving as the labyrinth flow channel outlet; the outer disc transition hole penetrating in the axial direction is arranged around between the inner tooth groove and the outer tooth groove; the inner disc transition hole penetrating in the vertical direction is arranged around on the inner disc; the inner disc transition hole comprises the inner disc inner transition hole on the inner side in the radial direction and the inner disc outer transition hole on the outer side in the radial direction; in each labyrinth flow channel unit, the vertically coinciding inner tooth groove of the upper and lower two outer discs serves as the fluid inlet of the labyrinth flow channel unit; the inner tooth groove of the upper and lower outer discs, the inner disc inner transition hole of the middle inner disc, the outer disc transition hole of the upper and lower outer discs, the inner disc outer transition hole of the middle inner disc and the outer tooth groove of the upper and lower outer discs are sequentially overlapped and penetrated from inside to outside in the adjacent regions, thereby forming the labyrinth flow channel unit with the multiple levels of flow channel buffer cavities for the inside and outside fluid communication.

4. A dead band labyrinth disc and porous sleeve combination according to claim 3, wherein: The outer diameters of the inner disc, the outer disc and the spacing disc are the same; the inner diameters of the inner disc and the outer disc are the same; and the inner diameters of the inner disc and the outer disc are 2-5 mm larger than the inner diameter of the spacing disc.

5. A dead band labyrinth disc and porous sleeve combination according to claim 4, wherein: Each inner disc inner transition hole is an isosceles trapezoidal hole; each inner disc outer transition hole comprises two symmetrical right-angled trapezoidal single holes with the adjacent right-angled sides; each outer disc transition hole comprises two symmetrical right-angled trapezoidal single holes with the adjacent right-angled sides; the outer side width of each single hole on the outer side in the radial direction of the disc is larger than the inner side width on the inner side; the outer tooth groove comprises two symmetrical single grooves; the groove width of the outer tooth groove single groove is greater than the outer side width of the inner disc outer transition hole single hole; the inner side width of the inner disc outer transition hole single hole is greater than the outer side width of the outer disc transition hole single hole; the distance between the inner side of the two single holes of the outer disc transition hole is greater than the outer side length of the inner disc inner transition hole; in the same labyrinth flow channel unit, the outer side region of the inner disc inner transition hole and the inner side region of the two single holes of the outer disc transition hole are overlapped and communicated; the outer side region of the two single holes of the outer disc transition hole and the single hole of the corresponding inner disc outer transition hole are overlapped and communicated; and the outer side region of the two single holes of the inner disc outer transition hole and the inner side region of the single groove of the corresponding outer tooth groove are overlapped and communicated.

6. A dead band labyrinth disc and porous sleeve combination according to claim 5, wherein: The thickness of the inner disc is 1.4-1.6 times of the thickness of the outer disc.

7. A dead band labyrinth disc and porous sleeve combination according to claim 6, wherein: The diameter of the fluid hole is less than the thickness of the disc set of the labyrinth flow channel, and the diameter of the fluid hole is greater than the sum of the thicknesses of the two outer discs.

8. A dead band labyrinth disc and porous sleeve combination according to claim 7, wherein: The upper outer periphery of the sleeve is provided with an upper inverted annular step and a lower inverted annular step, the lower inverted annular step is located inside the upper inverted annular step, the upper end of the labyrinth assembly is attached to the inverted step surface of the lower inverted annular step, the lower end of the labyrinth assembly is attached to the upper end surface of the sleeve gland, and the inner periphery of the sleeve gland is fixedly connected with the outer periphery of the sleeve bottom through threads.

9. A dead band labyrinth disc and porous sleeve combination according to claim 8, wherein: The labyrinth assembly further comprises a disc top ring and a disc bottom ring, the disc top ring is arranged at the upper end of the disc set of the labyrinth flow channel and the spacer disc stack, the disc bottom ring is arranged at the lower end of the disc set of the labyrinth flow channel and the spacer disc stack, the disc bottom ring, the disc top ring, the disc set of the labyrinth flow channel and the spacer disc stack are connected and positioned through a plurality of circularly arranged cylindrical pins, and are fastened through a plurality of circularly arranged long bolts.

10. A dead band labyrinth disc and porous sleeve combination according to claim 9, wherein: The upper end surface of the sleeve gland is provided with an annular groove, the tail of the long bolt is located in the annular groove, and the head of the long bolt and the upper end of the cylindrical pin are both lower than the upper end surface of the disc top ring in height.

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