Labyrinth disc assembly and high pressure difference control valve

Abstract

The invention provides a labyrinth disc assembly and a high pressure difference control valve, the labyrinth disc assembly comprises a plurality of labyrinth discs stacked along the same axis, the labyrinth discs are annular pieces, embedded discs are coaxially arranged among the plurality of labyrinth discs, supporting pieces are arranged between the embedded discs and the labyrinth discs, and the supporting pieces are connected with the labyrinth discs. A first-stage flow channel is formed between the adjacent labyrinth discs through the supporting piece, and the first-stage flow channel is an annular flow channel which detours in the axial direction and is communicated with the radial inner side and the radial outer side of the middle disc by 360 degrees in the circumferential direction; a second-stage flow channel is formed between the embedded disc and the adjacent labyrinth disc, and the second-stage flow channel is an annular flow channel which detours in the axial direction and is communicated with the radial inner side and the radial outer side of the embedded disc by 360 degrees in the circumferential direction. The labyrinth type high-pressure valve can solve the technical problem that the effective flow area of a labyrinth structure of an existing labyrinth type high-pressure valve is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve, in particular to a labyrinth disc assembly and a high-pressure differential control valve. BACKGROUND

[0002] At present, high-pressure valves are classified according to the form of the valve internals, including multi-stage high-pressure valves, labyrinth high-pressure valves, and single-seat sleeve load high-pressure valves, etc. The labyrinth high-pressure valve is used for fluid diversion by setting a plurality of labyrinth flow channels on the labyrinth sleeve. The existing labyrinth disc mainly adopts a plurality of radial detour throttling grooves machined on the disc. The detour part adopts a plurality of 90° bends for step-by-step pressure reduction. The actual flow area of such structure is 20%-40% smaller than that of ordinary valves, and the effective flow area is small. Moreover, the labyrinth disc has narrow throttling grooves, weak impurity resistance, and is easy to be blocked by fibers, viscous substances, and high solid content medium. It needs to be frequently disassembled and cleaned, and the maintenance frequency is high. Such a labyrinth disc usually needs to use dozens of discs in a set of valve. The multiple labyrinth discs need to be combined in a specific order and direction to form the correct flow channel, which has high operation requirements and low fault tolerance. The multiple labyrinth discs are welded together after combination, which will form a large welding deformation and need to be additionally machined and corrected. The debris generated after machining is easy to block the internal flow channel. SUMMARY

[0003] The present application provides a labyrinth disc assembly to solve the technical problem of small effective flow area of the existing labyrinth high-pressure valve.

[0004] The labyrinth disc assembly provided by the present application comprises: A plurality of labyrinth discs are arranged in layers along the same axis. The labyrinth disc is an annular disc. Support members are arranged between the plurality of labyrinth discs for support. First axial gaps are formed between the axially adjacent labyrinth discs to form a primary flow channel. The primary flow channel extends along the radial direction of the labyrinth disc and connects the radial inner side and the radial outer side of the labyrinth disc. The primary flow channel is reciprocally bent in the axial direction of the labyrinth disc. The primary flow channel is continuous in the circumferential direction of the labyrinth disc. An embedded disc is coaxially arranged in layers with the labyrinth disc. The embedded disc is an annular disc. The embedded disc is located between two axially adjacent labyrinth discs. The width of the embedded disc is smaller than that of the labyrinth disc along the radial direction of the labyrinth disc. Support members are arranged between the embedded disc and the adjacent labyrinth disc for support. Second axial gaps are formed between the embedded disc and the adjacent labyrinth disc by the support members to form a secondary flow channel. The secondary flow channel extends along the radial direction of the embedded disc and connects the radial inner side and the radial outer side of the embedded disc. The secondary flow channel is reciprocally bent in the axial direction of the embedded disc. The secondary flow channel is continuous in the circumferential direction of the embedded disc.

[0005] In one embodiment of the present application, at least part of the primary flow channel is located upstream of the secondary flow channel, and the cross-sectional area of the secondary flow channel is smaller than that of the primary flow channel.

[0006] In one embodiment of the present application, the labyrinth disc assembly comprises a lower disc, an upper disc, and at least one intermediate disc located between the lower disc and the upper disc. The top surface of the lower disc is concentrically provided with at least one throttling ring and at least one annular throttling groove. The bottom surface of the upper disc is concentrically provided with at least one throttling groove. The bottom surface of the intermediate disc is concentrically provided with at least one annular throttling groove corresponding to the throttling ring of the top surface of the lower disc. The top surface of the intermediate disc is concentrically provided with at least one annular throttling groove and at least one throttling ring corresponding to the throttling groove of the bottom surface of the upper disc. The throttling ring is at least partially located in the corresponding throttling groove by the support to form a reciprocating bending structure.

[0007] In one embodiment of the present application, a plurality of intermediate discs are arranged between the lower disc and the upper disc, and the primary flow channel is formed between adjacent two intermediate discs.

[0008] In one embodiment of the present application, the throttling grooves on the bottom surface of the upper disc, the bottom surface of the intermediate disc, the top surface of the intermediate disc, and the top surface of the lower disc are radially aligned.

[0009] In one embodiment of the present application, the top surface of the embedded disc is provided with at least one throttling ring matched with the throttling groove on the bottom surface of the intermediate disc or the upper disc. The bottom surface of the embedded disc is provided with at least one throttling ring matched with the throttling groove on the top surface of the intermediate disc or the lower disc. The throttling ring is at least partially located in the corresponding throttling groove by the support to form a reciprocating bending structure.

[0010] In one embodiment of the present application, the throttling ring on the top surface of the embedded disc is radially aligned with the throttling ring on the bottom surface of the embedded disc.

[0011] In one embodiment of the present application, the support is arranged on the lower disc, the intermediate disc, and the embedded disc. The supports on the lower disc, the intermediate disc, and the embedded disc are uniformly distributed around the axis of the labyrinth disc assembly. The supports are partially inserted into the throttling grooves, and the ends of the supports in the axial direction of the labyrinth disc assembly abut against the throttling grooves.

[0012] In one embodiment of the present application, the widths of the plurality of throttling rings are different in the radial direction of the labyrinth disc assembly.

[0013] The present application also provides a high-pressure differential control valve comprising a valve body, a valve seat, and a guide ring. The labyrinth disc assembly as described above is press-fitted to the valve seat through the guide ring.

[0014] The beneficial effects of the present application: the labyrinth disc assembly provided by the present application, a plurality of concentrically arranged labyrinth discs are supported by the support to form a plurality of layers of radial communication inside and outside the primary flow channel, and the primary flow channel is continuous in the circumferential direction of the labyrinth disc 360°, and each primary flow channel is further divided into two layers of secondary flow channels by the inner embedded disc, and the secondary flow channel is also continuous in the circumferential direction of the labyrinth disc 360°, and the primary flow channel and the secondary flow channel are both in the axial reciprocating bending structure. First, the opening structure which is radially communicated inside and outside and continuously in the circumferential direction 360° makes the effective flow area of the flow channel of the present application greatly increase compared with the prior art, and the annular structure of the whole flow channel has stronger impurity resistance, even if impurities are mixed in, it is not easy to block, and it will not have a great impact on the flow capacity. Secondly, the design of the primary flow channel and the secondary flow channel and the axial reciprocating bending design make the primary flow channel in the whole flow channel form a series flow channel, which can quickly reduce the fluid pressure, and then form a parallel flow channel through the secondary flow channel, which uniformly reduces the pressure and speed of the passing fluid, has the advantages of stable pressure reduction, small vibration, no adjustment dead zone and prevention of jamming. In addition, the flow channel formed in the present application is an axial reciprocating bending structure, which ensures the pressure reduction and speed reduction effect of the flowing medium, and the labyrinth disc and the inner embedded disc are both axial machining flow channel structures, compared with the radial machining flow channel structure in the prior art, the machining and manufacturing of all the discs in the present application are easier, and the manufacturing cost is lower.

[0015] The high-pressure differential regulating valve provided by the present application is provided with the labyrinth disc assembly, which is used as a flow dividing structure for fluid passing through the valve, so that the high-pressure differential regulating valve has higher impurity resistance, is not easy to block, has low maintenance frequency, long service life, high fluid flow efficiency and meets the use requirements of high-pressure differential working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings incorporated into the specification and forming part of the specification, show the embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0017] In the drawings: Figure 1 A cross-sectional view of a labyrinth disc assembly provided by an embodiment of the present application; Figure 2 A structural schematic view of an intermediate disc provided in an embodiment of the present application; Figure 3 A cross-sectional view of an intermediate disc provided in an embodiment of the present application; Figure 4 is a structural diagram of an embedded disc provided in an embodiment of the present application; Figure 5 is a sectional view of an embedded disc provided in an embodiment of the present application; Figure 6 is a sectional view of a high-pressure-differential regulating valve provided in an embodiment of the present application; Figure 7 is a sectional view of an inner part of a high-pressure-differential regulating valve provided in an embodiment of the present application.

[0018] Reference signs are as follows: Labyrinth disc assembly 1, upper disc 101, embedded disc 102, intermediate disc 103, lower disc 104, throttling ring 105, support 106, throttling groove 107, primary flow channel 108, secondary flow channel 109, valve seat 2, valve body 3, guide ring 4, valve cover 5. DETAILED DESCRIPTION

[0019] The embodiments of the present application will be described in detail with specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure. The present application can also be implemented or applied in other different embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0020] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and the drawings only show the components related to the present application, not the number, shape and size of the components when actually implemented. The shapes, number and proportions of the components when actually implemented can be arbitrarily changed, and the layout pattern of the components can also be more complex.

[0021] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application, however, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details, and in other embodiments, the known structures and devices are shown in the form of block diagrams rather than in the form of details, to avoid making the embodiments of the present application difficult to understand.

[0022] Please refer to Figure 1 , Figure 1 A labyrinth disc assembly provided in an embodiment of the present application comprises: The plurality of labyrinth disc pieces are arranged in a stack along the same axis, the labyrinth disc pieces are annular pieces, the inner diameter and the outer diameter of the plurality of labyrinth disc pieces are the same; support members 106 are arranged between the plurality of labyrinth disc pieces to support the labyrinth disc pieces, the support members 106 enable a first axial gap between axially adjacent labyrinth disc pieces to form a primary flow channel 108, the primary flow channel 108 extends along the radial direction of the labyrinth disc pieces and communicates the radial inner side and the radial outer side of the labyrinth disc pieces, the primary flow channel reciprocally bends in the axial direction of the labyrinth disc pieces, and the primary flow channel is continuous in the circumferential direction of the labyrinth disc pieces; The embedded disc piece 102 is a coaxially stacked annular piece with the labyrinth disc pieces, the inner diameter of the embedded disc piece 102 is greater than that of the labyrinth disc piece, the outer diameter of the embedded disc piece 102 is less than that of the labyrinth disc piece, that is, along the radial direction of the labyrinth disc piece, the width of the embedded disc piece 102 is less than that of the labyrinth disc piece. The embedded disc piece 102 is located in the primary flow channel 108 between two axially adjacent labyrinth disc pieces, and support members 106 are arranged between the embedded disc piece 102 and the adjacent labyrinth disc pieces to support the embedded disc piece 102 and the adjacent labyrinth disc pieces, the support members 106 enable a second axial gap between the embedded disc piece 102 and the adjacent labyrinth disc pieces to form a secondary flow channel 109, the secondary flow channel 109 extends along the radial direction of the embedded disc piece 102 and communicates the radial inner side and the radial outer side of the embedded disc piece 102, the secondary flow channel 109 reciprocally bends in the axial direction of the embedded disc piece 102, and the secondary flow channel 109 is continuous in the circumferential direction of the embedded disc piece 102.

[0023] The plurality of labyrinth disc pieces arranged coaxially in the embodiment form a cylindrical labyrinth disc piece assembly, and a plurality of primary flow channels 108 are formed between the labyrinth disc pieces by the support member 106, and the primary flow channels 108 are continuous in the circumferential direction of the labyrinth disc pieces, and each primary flow channel 108 is further divided into two secondary flow channels 109 by the inner embedded disc 102, and the secondary flow channels 109 are also continuous in the circumferential direction of the labyrinth disc pieces by 360°, and the primary flow channels 108 and the secondary flow channels 109 are both structures that are repeatedly bent in the axial direction of the labyrinth disc pieces. First, the opening structure that is continuous in the radial direction and the circumferential direction by 360° greatly increases the effective flow area of the flow channel of the present application compared with the prior art, and the annular structure of the entire flow channel has stronger impurity resistance, and even if impurities are mixed in, it is not easy to block, and it will not have a great impact on the flow capacity. Second, the design of the primary flow channels 108 and the secondary flow channels 109 and the repeatedly bent design in the axial direction allow the primary flow channels 108 in the overall flow channel to form a series flow channel, which allows the fluid pressure to drop rapidly, and then forms a parallel flow channel through the secondary flow channel 109, which uniformly reduces the pressure and speed of the fluid passing through, has the advantages of stable pressure reduction, small vibration, no adjustment dead zone, and prevents jamming. In addition, the flow channel formed in the present application is a repeatedly bent structure in the axial direction, which ensures the pressure reduction and speed reduction effect of the flowing medium, and the labyrinth disc and the inner embedded disc 102 are both flow channel structures machined in the axial direction, which is easier to manufacture than the radial machining flow channel structure in the prior art, and has lower manufacturing cost.

[0024] For example, in the present embodiment, the labyrinth disc includes a lower disc 104, an upper disc 101, and at least one intermediate disc 103 between the lower disc 104 and the upper disc 101, and the top surface of the lower disc 104 is concentrically provided with one throttle ring 105 and five annular throttle grooves 107. The bottom surface of the upper disc 101 is concentrically provided with seven throttle grooves 107. As shown in Figure 2 、 Figure 3 The bottom surface of the intermediate disc 103 is concentrically provided with seven throttle grooves 107, one of which corresponds to the throttle ring 105 on the top surface of the lower disc 104, and the top surface of the intermediate disc 103 is concentrically provided with five annular throttle grooves 107 and one throttle ring 105 corresponding to the second throttle groove 107 from the inside to the outside on the bottom surface of the upper disc 101.

[0025] In the present embodiment, the top surface of the lower disc 104 and the top surface of the intermediate disc 103 are provided with support members 106, which are located inside the first throttle ring 105 from the inside to the outside of the lower disc 104 and the intermediate disc 103, and the support members 106 make each throttle ring 105 at least partially located in the corresponding throttle groove 107, and the gap between the throttle ring 105 and the throttle groove 107 forms a flow channel structure that is repeatedly bent in the axial direction.

[0026] It should be noted that the number of throttle rings 105 and throttle grooves 107 is not limited to the number provided in the embodiment, and more or less can also be set according to actual needs. The annular structure is a rotary structure on the disc, which can be machined by a lathe, and is convenient and low-cost to manufacture. And the flow channel formed has the effects of detouring, reducing pressure and reducing speed, and also has a 360° circumferential opening flow area.

[0027] For example, in the embodiment, a plurality of intermediate discs 103 are arranged between the lower disc 104 and the upper disc 101, and a first flow channel 108 is formed between the adjacent two intermediate discs 103. In the embodiment, the number of intermediate discs 103 is preferably four, and it should be noted that the number of intermediate discs 103 is not limited to four, and more or less can also be selected according to actual needs. The plurality of intermediate discs 103 increases the number of axial first flow channels 108, thereby increasing the effective flow area of the entire labyrinth assembly, which can meet the flow needs of large flow fluid.

[0028] For example, in the embodiment, the throttle grooves 107 on the bottom surface of the upper disc 101, the throttle grooves 107 on the bottom surface of the intermediate disc 103, the throttle grooves 107 on the top surface of the intermediate disc 103, and the throttle grooves 107 on the top surface of the lower disc 104 are radially aligned. The support 106 on the lower disc 104 is radially aligned with the first throttle groove 107 from the inside to the outside of the bottom surface of the intermediate disc 103, and the support 106 on the intermediate disc 103 is radially aligned with the first throttle groove 107 from the inside to the outside of the bottom surface of the upper disc 101. In the embodiment, as long as the support 106 is aligned and inserted into the corresponding throttle groove 107, the axial alignment of the lower disc 104, the intermediate disc 103 and the upper disc 101 can be ensured, and the throttle grooves 107 of the lower disc 104, the intermediate disc 103 and the upper disc 101 are radially aligned, so that the assembly of the labyrinth assembly is more simple and convenient, has a foolproof function, and has low assembly difficulty.

[0029] For example, in the embodiment, as shown in Figure 4 , Figure 5 , the top surface of the embedded disc 102 is provided with three throttle rings 105 matched with the throttle grooves 107 on the bottom surface of the intermediate disc 103 or the upper disc 101, and the bottom surface of the embedded disc 102 is provided with three throttle rings 105 matched with the throttle grooves 107 on the top surface of the intermediate disc 103 or the lower disc 104. The throttle rings 105 on the top surface of the embedded disc 102 are radially aligned with the throttle rings 105 on the bottom surface.

[0030] The throttle rings 105 on the inner disc 102 correspond to the third, fifth and sixth throttle grooves 107 from the inside to the outside in the radial direction on the upper disc 101 and the intermediate disc 103, and correspond to the first, third and fourth throttle grooves 107 from the inside to the outside in the radial direction on the lower disc 104. The support members 106 are arranged between the first and second throttle rings 105 from the inside to the outside in the radial direction on the inner disc 102 and on the radial outside of the third throttle ring 105. The support members 106 on the inner disc 102 are aligned with the second and fifth throttle grooves 107 from the inside to the outside in the radial direction on the lower disc 104, and aligned with the fourth and seventh throttle grooves 107 from the inside to the outside in the radial direction on the upper disc 101 and the intermediate disc 103. The support members 106 are inserted into the corresponding throttle grooves 107, so that the throttle rings 105 on the inner disc 102 are at least partially located in the corresponding throttle grooves 107, and the flow channel structure of the axial reciprocating bending is formed between the throttle rings 105 and the throttle grooves 107.

[0031] For example, in the embodiment, at least part of the primary flow channel 108 is located upstream of the secondary flow channel 109, and the flow passage area of the secondary flow channel 109 is smaller than the flow passage area of the primary flow channel 108. In this way, the primary flow channel 108 can rapidly reduce the fluid pressure, and the secondary flow channel 109 can uniformly reduce the fluid pressure and speed.

[0032] For example, in the embodiment, the support members 106 on the lower disc 104, the intermediate disc 103 and the inner disc 102 are all annularly and uniformly distributed four support blocks. The support blocks are integrally formed on the lower disc 104, the intermediate disc 103 and the inner disc 102, the height of the support blocks in the axial direction is greater than the height of the throttle rings 105, part of the support members 106 are inserted into the throttle grooves 107, and the end of the support members 106 in the axial direction of the labyrinth disc assembly abuts against the throttle grooves 107.

[0033] In the embodiment, the support members 106 adopt a plurality of annularly and uniformly distributed support blocks. The flow channels for fluid flow are formed between adjacent support blocks, and the four support blocks at the same radial position ensure stable support for adjacent discs.

[0034] For example, in the embodiment, the widths of the plurality of throttle rings 105 are different in the radial direction of the labyrinth disc assembly. In this way, the structural strength of the different throttle rings 105 in the radial direction is different, which adapts to the change of the fluid pressure working condition, can smoothly reduce the fluid pressure, reduce vibration and prevent jamming.

[0035] The labyrinth assembly provided by the application has an increased effective flow area compared with a traditional labyrinth disc, and the number of labyrinth discs required by the application is less than that of the prior art under the same conditions. All the discs are rotary structures, and only the support block needs to be machined, and the rest can be machined on a lathe, thereby reducing the cost. The traditional labyrinth disc needs to be welded together after machining, which will form a large welding deformation and needs additional machining. The technical scheme of the application does not need welding, and there is a foolproof design between different labyrinth discs. As long as the correct nesting is achieved, the installation requirements can be met, the assembly can be completed through axial stacking, the post-machining debris removal work is reduced, the difficulty of later maintenance and replacement is greatly reduced, and the maintenance cost is reduced.

[0036] In the application, the entire flow channel is annular, and has strong impurity resistance. Even if impurities are mixed in, the flow capacity will not be greatly affected. Compared with other sleeve type labyrinth discs, the application adds an embedded disc 102 to form a flow channel in a shunt form. The front section is a series flow channel, and the purpose is to rapidly reduce the fluid pressure, and then uniformly reduce the pressure and speed of the fluid through a parallel flow channel, which has the advantages of stable pressure reduction, small vibration, no regulation dead zone, and prevention of labyrinth flow channel jamming.

[0037] The application also provides a high-pressure-difference control valve, as shown in Figure 6 、 Figure 7 The valve body 3, the valve seat 2, the guide ring 4 and the valve cover 5 are provided. The valve seat 2 is located in the valve body 3, the labyrinth disc assembly 1 is placed on the valve seat 2, the guide ring 4 is placed above the labyrinth disc assembly 1, the valve cover 5 is installed above the guide ring 4, the valve cover 5 is bolted to the valve body 3 to press the guide ring 4 downward, and the guide ring 4 presses the labyrinth disc assembly 1 downward and is assembled on the valve seat 2.

[0038] The application provides a high-pressure-difference control valve, which presses the labyrinth disc assembly 1 on the valve seat 2 through the guide ring 4. The labyrinth disc assembly 1 is used as a shunt structure for fluid passing through the valve. The labyrinth disc assembly 1 makes the high-pressure-difference control valve have higher impurity resistance, is not easy to block, has a low maintenance frequency, has a long service life, has high fluid flow efficiency, and meets the use requirements of high-pressure-difference working conditions.

[0039] The above embodiments only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the application should be covered by the claims of the application.

Claims

1. A labyrinthe disc pack assembly, characterized in that, The application relates to a labyrinth disc assembly, which comprises: a plurality of labyrinth discs arranged in a stack along the same axis, the labyrinth discs being annular discs, support members being arranged between the labyrinth discs to support the labyrinth discs, first axial gaps being arranged between axially adjacent labyrinth discs to form primary flow channels, the primary flow channels extending along the radial direction of the labyrinth discs and connecting the inner side and the outer side of the labyrinth discs in the radial direction, the primary flow channels being repeatedly bent in the axial direction of the labyrinth discs and being continuous in the circumferential direction of the labyrinth discs; an inner disc arranged in a stack coaxially with the labyrinth discs, the inner disc being an annular disc arranged between two axially adjacent labyrinth discs, the width of the inner disc being smaller than the width of the labyrinth discs in the radial direction of the labyrinth discs, support members being arranged between the inner disc and the adjacent labyrinth discs to support the inner disc and the adjacent labyrinth discs, second axial gaps being arranged between the inner disc and the adjacent labyrinth discs to form secondary flow channels, the secondary flow channels extending along the radial direction of the labyrinth discs and connecting the inner side and the outer side of the inner disc in the radial direction, the secondary flow channels being repeatedly bent in the axial direction of the inner disc and being continuous in the circumferential direction of the inner disc.

2. A labyrinthe disc pack assembly according to claim 1, wherein: At least part of the primary flow channels is arranged upstream of the secondary flow channels, and the cross-sectional area of the secondary flow channels is smaller than that of the primary flow channels.

3. A labyrinthe disc pack assembly according to claim 2, wherein: The labyrinth discs comprise a lower disc, an upper disc and at least one intermediate disc arranged between the lower disc and the upper disc, the top surface of the lower disc is concentrically provided with at least one throttling ring and at least one annular throttling groove; the bottom surface of the upper disc is concentrically provided with at least one throttling groove; the bottom surface of the intermediate disc is concentrically provided with at least one annular throttling groove corresponding to the throttling ring of the top surface of the lower disc, and the top surface of the intermediate disc is concentrically provided with at least one annular throttling groove and at least one throttling ring corresponding to the throttling groove of the bottom surface of the upper disc; the throttling ring is at least partially arranged in the corresponding throttling groove by the support member to form a repeatedly bent structure.

4. A labyrinthe disc pack assembly according to claim 3, wherein: A plurality of intermediate discs are arranged between the lower disc and the upper disc, and the primary flow channels are formed between two adjacent intermediate discs.

5. A labyrinthe disc pack assembly according to claim 4, wherein: The throttling grooves of the bottom surface of the upper disc, the throttling grooves of the bottom surface of the intermediate disc, the throttling grooves of the top surface of the intermediate disc and the throttling grooves of the top surface of the lower disc are aligned in the radial direction.

6. A labyrinth disc assembly according to claim 1, wherein: The top surface of the inner disc is provided with at least one throttling ring matched with the throttling groove of the bottom surface of the intermediate disc or the upper disc, and the bottom surface of the inner disc is provided with at least one throttling ring matched with the throttling groove of the top surface of the intermediate disc or the lower disc, the throttling ring is at least partially arranged in the corresponding throttling groove by the support member to form a repeatedly bent structure.

7. A labyrinthe disc assembly according to claim 6, wherein: The throttling ring of the top surface of the inner disc is aligned with the throttling ring of the bottom surface of the inner disc in the radial direction.

8. A labyrinthe disc pack assembly according to claim 5 or 7, characterised in that: The support members are arranged on the lower disc, the intermediate disc and the inner disc, and a plurality of support members are uniformly distributed around the axis of the labyrinth disc assembly on the lower disc, the intermediate disc and the inner disc, the support members are partially inserted into the throttling grooves, and the end of the support member in the axial direction of the labyrinth disc assembly abuts against the throttling groove.

9. A labyrinthe disc pack assembly according to claim 8, wherein: The widths of the plurality of throttle rings are different in the radial direction of the labyrinth disc assembly.

10. A high pressure drop control valve comprising a valve body, a valve seat and a guide ring, characterized in that: The labyrinth disc assembly according to any one of claims 1-9 is pressed into the valve seat by means of the guide ring.

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