Floating ring sealing structure of multi-level tree-shaped support

Abstract

The utility model discloses a multi-level tree-shaped supporting floating ring sealing structure which comprises a stator assembly and a rotor assembly, the stator assembly comprises a sealing cavity and a pressing end cover detachably connected with the sealing cavity, the multi-level tree-shaped supporting floating ring sealing structure further comprises a flat foil located in the sealing cavity, and the flat foil is annular and is arranged outside the rotor assembly in a sleeving mode; a plurality of supporting pieces are evenly distributed on the outer wall of the flat foil. The utility model provides a floating ring sealing structure of a multi-level tree-shaped support to solve the problem that the stability of a floating ring sealing structure in the prior art is insufficient and achieve the purposes of improving the stability of the floating ring sealing structure and prolonging the service life of the floating ring sealing structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of mechanical seal, concretely relates to a floating ring seal structure of multilevel tree support. BACKGROUND

[0002] Floating ring seal is a kind of fluid seal, which is developed from gas floating bearing and oil film bearing, belongs to fluid throttling type non-contact seal, and is a kind of mixed seal combined with radial and axial seals;Its principle is that floating ring and shaft have small wedge-shaped gap, and the sealing medium flowing between floating ring and shaft moves synchronously with the high-speed rotation of shaft, forming a fluid film with certain carrying capacity.The fluid film lifts the floating ring, so that the floating ring and the shaft are in throttling and pressure reduction, thereby realizing radial sealing;At the same time, the low-pressure side of floating ring is close to the sealing surface by the action of spring force, thereby realizing end face sealing.

[0003] The existing floating ring seal structure mainly has problems of leakage, wear and insufficient stability.The leakage problem mainly lies in that the floating ring gap is difficult to control accurately, and too small gap is easy to cause shaft holding, and too large gap will increase leakage amount;Secondly, the fluid film formation is unstable, and the changes of pressure, temperature and quality of lubricating medium will affect the formation of fluid film;The wear problem mainly occurs in the wear of floating ring and shaft, and the wear caused by relative rotation between parts and material quality problem;The stability problem mainly lies in that the floating ring is in initial unstable state due to hard contact and impact, and the floating ring may contact again or even oscillate with the sealing counterpart due to too large displacement when floating or adapting to rotor runout, so that the floating ring is in continuous unstable state.

[0004] In summary, it is necessary to improve and optimize the existing floating ring seal structure. UTILITY MODEL CONTENTS

[0005] The utility model provides a floating ring seal structure of multilevel tree support to solve the problem of insufficient stability of floating ring seal structure in prior art, and realizes the purpose of improving the stability and service period of floating ring seal structure.

[0006] The utility model realizes the following technical scheme:

[0007] A floating ring seal structure of multilevel tree support, comprising a stator assembly and a rotor assembly, the stator assembly comprises a sealing cavity, a compression end cover detachably connected with the sealing cavity, and a flat foil located inside the sealing cavity, the flat foil is annular and sleeved outside the rotor assembly;The outer wall of the flat foil is uniformly distributed with a plurality of support members.

[0008] In view of the problem of insufficient stability of the floating ring sealing structure in the prior art, the utility model provides a floating ring sealing structure of multilevel tree support, wherein the stator assembly, the rotor assembly, the sealing cavity and the compression end cover are all prior art, and details are not repeated here. The structure takes the sealing cavity as the main structure of the stator assembly, sets annular flat foil in it, and sets a plurality of evenly distributed support members on the outer wall of the flat foil. The two side surfaces of the flat foil in the application are smooth, and the two side surfaces are flat after being unfolded to a plane.

[0009] In use, the rotor assembly is eccentrically installed compared with the stator assembly, passes through the flat foil, and the pressure of the sealing medium (such as gas, liquid, two-phase fluid, etc.) is gradually reduced from the high-pressure side to the low-pressure side. The rotor assembly is eccentrically installed in the sealing cavity. Due to the compressibility of the sealing medium, when it synchronously rotates with the rotating shaft, the dynamic pressure effect occurs, thereby generating and maintaining the pressure of the fluid, resisting the leakage of the external medium, and forming the main leakage channel of the wedge-shaped gap.

[0010] The application provides more stable positioning and support for the floating ring sealing structure through the setting of a plurality of support members, and can better adapt to the dynamic changes of the rotor assembly, such as oscillation and deviation of the rotating shaft. When the rotor assembly deviates, the support member can guide it to fine-tune, so that the gap between the flat foil and the rotor assembly can be kept as uniform as possible, thereby ensuring the stability of the fluid film. In addition, the plurality of support members can also maintain the overall good stability of the floating ring sealing structure, effectively utilize the existing space, and make the floating ring sealing structure have good buffering performance, thereby prolonging the service cycle of the floating ring sealing structure. At the same time, the flat foil and the support member in the application form a hierarchical structure in the radial direction, which is also conducive to reducing the leakage amount and improving the sealing effect.

[0011] Further, the support member includes a plurality of branches, and the adjacent two branches gradually move away from each other in the radial direction. For the adjacent two branches, they jointly form a "V" structure that opens outward in the radial direction, thereby facilitating the reliability and stability of the floating ring sealing under a large pressure difference.

[0012] Further, the support member further includes a connecting portion, the branches are fixed on the connecting portion, and the connecting portion is fixedly connected with the flat foil. The connecting portion realizes the fixed connection between the support member and the flat foil, and all the branches on each support member are located on the connecting portion.

[0013] Further, the length of the branch is 1-2 mm.

[0014] Further, the included angle between the adjacent two branches is 60-80 degrees.

[0015] Further, the number of branches on the support member is greater than or equal to 2.

[0016] Further, the connecting part is in a columnar shape, and a plurality of mounting holes matched with the connecting part are arranged on the flat foil. In this scheme, the connecting part is inserted into the corresponding mounting hole for fixation, and the connecting mode between the connecting part and the mounting hole can adopt any existing fixed connection mode or a detachable fixed connection mode for replacement.

[0017] Further, one end of the flat foil is further provided with a positioning ring extending radially outward, and the positioning ring is clamped between the sealing cavity and the compression end cover, so as to realize positioning and mounting of the flat foil.

[0018] Further, the sealing cavity is shared by two, and the two sealing cavities are symmetrically distributed at two ends of the compression end cover. The compression end cover is provided with an inlet hole for the entry of the sealing medium.

[0019] Compared with the prior art, the utility model has at least the following advantages and beneficial effects:

[0020] 1. The floating ring sealing structure with multi-level tree-shaped support can provide more stable positioning and support for the floating ring sealing structure, better adapt to the dynamic change of the rotor assembly, guide the rotor assembly to fine adjustment when the rotor assembly deviates, ensure the gap between the flat foil and the rotor assembly to be as uniform as possible, and guarantee the stability of the fluid film.

[0021] 2. The floating ring sealing structure with multi-level tree-shaped support can maintain the overall good stability of the floating ring sealing structure, effectively utilize the existing space, have good buffering performance, and prolong the service period of the floating ring sealing structure.

[0022] 3. The floating ring sealing structure with multi-level tree-shaped support forms a hierarchical structure in the radial direction of the flat foil and the support, which is also conducive to reducing the leakage amount and improving the sealing effect. DETAILED DESCRIPTION

[0023] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present application and constitute a part of the application, do not constitute a limitation to the embodiments of the present application. In the drawings:

[0024] Figure 1 is a structural schematic view of the embodiment of the present application;

[0025] Figure 2 is an exploded view of the embodiment of the present application;

[0026] Figure 3 is a half-section structural schematic view of the embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of the structure of the flat foil in a specific embodiment of this utility model;

[0028] Figure 5 This is a partial schematic diagram of the unfolded flat foil sheet in a specific embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram of the support member in a specific embodiment of the present utility model.

[0030] The attached diagram shows the markings and corresponding component names:

[0031] 1-Sealed cavity, 2-Pressure end cap, 3-Flat foil, 31-Support member, 311-Bifurcation, 312-Connecting part, 32-Mounting hole, 33-Positioning ring, 4-Inlet hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model. In the description of this application, it should be understood that terms such as "front," "rear," "left," "right," "up," "down," "vertical," "horizontal," "high," "low," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0033] Example 1:

[0034] like Figures 1 to 6 The floating ring sealing structure shown includes a multi-level tree-like support, a stator assembly, and a rotor assembly. The stator assembly includes a sealing cavity 1 and a pressing end cap 2 detachably connected to the sealing cavity 1. The floating ring sealing structure also includes a flat foil 3 located inside the sealing cavity 1. The flat foil 3 is annular and sleeved on the outside of the rotor assembly. A plurality of support members 31 are evenly distributed on the outer wall of the flat foil 3.

[0035] In this embodiment, the inlet hole 4 required for the floating ring seal is opened on the clamping end cap 2.

[0036] In this embodiment, there are two sealing cavities 1, which are symmetrically distributed along the axial direction at both ends of the clamping end cap 2.

[0037] In this embodiment, the rotor assembly is a rotating shaft that moves through the flat foil and is eccentrically installed in the sealed cavity during use; the clamping end cover 2 and the sealed cavity 1 can be connected by bolts, pins, etc.

[0038] In this embodiment, the support member 31 is as follows: Figure 6 As shown, the support includes several branches 311, with adjacent branches 311 gradually moving away from each other radially from the inside out. The support member 31 also includes a connecting part 312, on which the branches 311 are fixed, and the connecting part 312 is fixedly connected to the flat foil 3. One end of the connecting part is fixedly connected to the flat foil 3, and the other end has several branches 311.

[0039] The number of branches 311 on the support member 31 is greater than or equal to 2, and in this embodiment, four branches are preferred.

[0040] In a more preferred embodiment, the connecting portion 312 is columnar, and the flat foil 3 has a plurality of mounting holes 32 that match the connecting portion 312. The connecting portion 312 and the mounting holes 32 can be connected by threads, or by bonding, welding, or other methods. The connecting portion 312 can be any columnar structure such as a cylinder or square column.

[0041] In a more preferred embodiment, the length of each fork 311 is 1 to 2 mm, preferably 1.05 mm.

[0042] In a more preferred embodiment, the included angle between two adjacent branches 311 is 60° to 80°, preferably 70°.

[0043] In a more preferred embodiment, the axis of the connecting portion 312 extends in the radial direction; and the overall projected length of the support member 31 in the axial direction of the connecting portion 312 is 1 to 3 mm.

[0044] Example 2:

[0045] A multi-level, tree-like supported floating ring sealing structure, based on Example 1, such as... Figures 1 to 6 As shown, one end of the flat foil 3 is also provided with a positioning ring 33 extending radially outward, and the positioning ring 33 is clamped between the sealing cavity 1 and the pressing end cap 2.

[0046] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

[0047] It is to be noted that, as used in this text, the terms "comprises", "comprising", or other variations such as "comprises", "comprising", or "including" merely specify the presence of stated features, integers, steps, or components, but do not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof. Furthermore, as used in this text, the term "coupled" means directly or indirectly connected, without loss of generality.

Claims

1. A multi-stage tree supported floating ring seal structure, comprising a stator assembly, a rotor assembly, the stator assembly comprising a seal cavity (1), a compression end cover (2) detachably connected with the seal cavity (1), characterized in that, A flat foil (3) is arranged inside the sealed cavity (1), the flat foil (3) is annular and sleeved outside the rotor assembly; the outer wall of the flat foil (3) is uniformly provided with a plurality of support members (31).

2. A multi-stage tree supported floating ring seal structure according to claim 1, wherein, The support member (31) comprises a plurality of bifurcations (311), and adjacent two bifurcations (311) are gradually away from each other in the radial direction from inside to outside.

3. A multi-stage tree supported floating ring seal structure according to claim 2, wherein, The support member (31) further comprises a connecting portion (312), the bifurcations (311) are fixed on the connecting portion (312), and the connecting portion (312) is fixedly connected with the flat foil (3).

4. A multi-stage tree supported floating ring seal structure according to claim 2, wherein, The length of the bifurcation (311) is 1-2 mm.

5. A multi-stage tree supported floating ring seal structure according to claim 2, wherein, The included angle between adjacent two bifurcations (311) is 60-80°.

6. A multi-stage tree supported floating ring seal structure according to claim 2, wherein, The number of bifurcations (311) on the support member (31) is greater than or equal to 2.

7. A multi-stage tree supported floating ring seal structure according to claim 3, wherein, The connecting portion (312) is columnar, and a plurality of mounting holes (32) matched with the connecting portion (312) are arranged on the flat foil (3).

8. A multi-stage tree supported floating ring seal structure according to any one of claims 1 to 7, wherein, One end of the flat foil (3) is further provided with a positioning ring (33) extending radially outward, and the positioning ring (33) is clamped between the sealed cavity (1) and the compression end cover (2).

9. A multi-stage tree supported floating ring seal structure according to any one of claims 1 to 7, wherein, The sealed cavity (1) is two, and the two sealed cavities (1) are symmetrically distributed on both ends of the compression end cover (2) in the axial direction.

10. A multi-stage tree supported floating ring seal structure according to any one of claims 1 to 7, wherein, The compression end cover (2) is provided with an inflow hole (4).

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