Brush type sealing structure with elastic front plate

Abstract

The utility model discloses a brush-type sealing structure with an elastic front plate. The brush-type sealing structure with the elastic front plate comprises the front plate, the elastic front plate and the elastic front plate, the back plate is positioned behind the front plate; the brush wire bundle is clamped between the front plate and the back plate; the elastic part is in a circular ring shape and is arranged on the front plate, the rear surface of the elastic part abuts against the brush wire bundle, the elastic part is provided with a plurality of elastic notches which are formed in the circumferential direction of the elastic part at intervals, and the elastic notches are communicated with the front edge of the elastic part. The brush type sealing structure with the elastic front plate has the advantages of being good in sealing effect, long in service life and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to dynamic sealing technical field, specifically, relate to a brush type sealing structure with elastic front plate. BACKGROUND

[0002] The brush type sealing reduces air leakage through the flexible brush filament bundle and rotor surface adhesion. It is used in aero-engine, gas turbine and turbine and other turbomachinery. Compared with the labyrinth seal, the brush type sealing has better sealing performance.

[0003] The brush filament of the brush type sealing structure in the related art is prone to vibration under the action of air flow, also known as "chatter" phenomenon. This phenomenon not only reduces the sealing performance of the brush type sealing structure, resulting in increased leakage, but also easily reduces the working life of the brush type sealing structure. SUMMARY

[0004] The utility model discloses at least one of the technical problems in the prior art. To this end, the utility model provides a brush type sealing structure with elastic front plate, which has the advantages of good sealing effect, long service life and the like.

[0005] To achieve the above-mentioned purpose, according to the embodiment of the utility model provides a brush type sealing structure with elastic front plate, the brush type sealing structure with elastic front plate includes: front plate;Back plate, the back plate is located behind the front plate;Brush filament bundle, the brush filament bundle is clamped between the front plate and the back plate;Elastic piece, the elastic piece is circular, the elastic piece is arranged on the front plate, the rear surface of the elastic piece and the brush filament bundle abut, a plurality of elastic notches are arranged on the elastic piece along the circumferential direction of the elastic piece, and the elastic notch is communicated with the front edge of the elastic piece.

[0006] The brush type sealing structure with elastic front plate according to the embodiment of the utility model has the advantages of good sealing effect, long service life and the like.

[0007] In addition, the brush type sealing structure with elastic front plate according to the above-mentioned embodiment of the utility model can also have the following additional technical features:

[0008] According to one embodiment of the utility model, the rear surface of the elastic piece is configured as an arc surface that is convex rearward compared with the radial inner and outer edges.

[0009] According to one embodiment of the utility model, the elastic piece includes: a rear abutting portion, the rear surface of the rear abutting portion abuts with the brush filament bundle;Compression portion, the compression portion extends forward and radially outward from the rear abutting portion;

[0010] The backfolding part is folded back from the front edge of the compression part, and the rear surface of the front plate is provided with a mounting groove, and the radially outer surface of the mounting groove is provided with a positioning groove, and the backfolding part is matched in the positioning groove.

[0011] According to an embodiment of the present application, the elastic member comprises: a rear abutting part, a rear surface of the rear abutting part abutting with the brush filament bundle; a front abutting part, a front surface of the front abutting part abutting with the front plate; a compression part, the compression part being connected with the front abutting part and the rear abutting part respectively, and a cross section of the compression part perpendicular to a circumferential direction of the compression part being V-shaped.

[0012] According to an embodiment of the present application, the elastic member comprises: a rear abutting part, a rear surface of the rear abutting part abutting with the brush filament bundle; a front abutting part, a front surface of the front abutting part abutting with the front plate; a compression part, the compression part being connected with the front abutting part and the rear abutting part respectively, and a cross section of the compression part perpendicular to a circumferential direction of the compression part being Z-shaped.

[0013] According to an embodiment of the present application, the elastic member comprises: a rear abutting part, a rear surface of the rear abutting part abutting with the brush filament bundle; a front abutting part, a front surface of the front abutting part abutting with the front plate; a compression part, the compression part being connected with the front abutting part and the rear abutting part respectively, and a cross section of the compression part perpendicular to a circumferential direction of the compression part being Z-shaped.

[0014] According to an embodiment of the present application, the elastic member is welded with the front plate.

[0015] According to an embodiment of the present application, a front surface of the back plate is provided with a recess.

[0016] According to an embodiment of the present application, a rear surface of the elastic member is provided with a self-lubricating coating.

[0017] According to an embodiment of the present application, the elastic member is a plate bending member, and a plate thickness is 0.2-1mm.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description given below, taken in conjunction with the drawings in which:

[0020] Figure 1is a sectional view of a brush seal structure with an elastic front plate according to some embodiments of the present utility model.

[0021] Figure 2 is a partial sectional view of a brush seal structure with an elastic front plate according to some embodiments of the present utility model.

[0022] Figure 3 is a structural schematic view of an elastic piece of a brush seal structure with an elastic front plate according to some embodiments of the present utility model.

[0023] Figure 4 is a partial sectional view of an elastic piece of a brush seal structure with an elastic front plate according to some embodiments of the present utility model.

[0024] Figure 5 is a partial sectional view of a brush seal structure with an elastic front plate according to some other embodiments of the present utility model.

[0025] Figure 6 is a structural schematic view of an elastic piece of a brush seal structure with an elastic front plate according to some other embodiments of the present utility model.

[0026] Figure 7 is a partial sectional view of an elastic piece of a brush seal structure with an elastic front plate according to some other embodiments of the present utility model.

[0027] Figure 8 is a partial sectional view of a brush seal structure with an elastic front plate according to some other embodiments of the present utility model.

[0028] Figure 9 is a structural schematic view of an elastic piece of a brush seal structure with an elastic front plate according to some other embodiments of the present utility model.

[0029] Figure 10 is a partial sectional view of an elastic piece of a brush seal structure with an elastic front plate according to some other embodiments of the present utility model.

[0030] Figure 11 is a partial sectional view of a brush seal structure with an elastic front plate according to some other embodiments of the present utility model.

[0031] Figure 12 is a structural schematic view of an elastic piece of a brush seal structure with an elastic front plate according to some other embodiments of the present utility model.

[0032] Figure 13 is a partial sectional view of an elastic piece of a brush seal structure with an elastic front plate according to some other embodiments of the present utility model.

[0033] Brush seal structure with elastic front plate 1, front plate 10, front plate main body 11, positioning portion 12, mounting groove 13, positioning groove 14, back plate 20, groove 21, brush filament bundle 30, elastic member 40, elastic notch 41, rear abutting portion 42, compression portion 43, backfolding portion 44, front abutting portion 45, front connecting portion 46. DETAILED DESCRIPTION

[0034] The present application is based on the discovery and realization of the inventors of the following facts and problems:

[0035] The brush filaments of the brush seal structure in the related art are prone to vibration under the action of air flow, also known as the "chatter" phenomenon. This phenomenon not only reduces the sealing performance of the brush seal structure, leading to an increase in leakage, but also easily reduces the working life of the brush seal structure.

[0036] Specifically, part of the brush seal structure in the related art provides a compression ring, and uses an elastic member or air flow to drive the compression ring to provide a compression force to the brush filament bundle to suppress the chatter phenomenon of the brush filament bundle. However, the inventors of the present application have found through extensive research that such a scheme is prone to rapid wear of the brush filament bundle, reducing the service life of the brush seal structure.

[0037] The inventors of the present application have further found that the brush seal structure in the related art that uses a compression ring to provide a compression force causes wear because, during operation, the compression ring not only produces a compression force on the brush filament bundle in the axial direction, but also is prone to relative displacement with the brush filament bundle in the radial direction, resulting in frequent friction between the compression ring and the brush filament bundle, accelerating the wear of the brush seal structure.

[0038] In addition, the elastic member used in the related art to provide a compression force has poor flexibility and is difficult to fully adapt to the vibration of the brush filament bundle. For example, when the amplitude of the brush filament bundle is small, the elastic member is difficult to fully elastically deform, and is prone to excessive compression force and accelerated wear.

[0039] Embodiments of the present application will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0040] In the description of the utility model, it needs to be understood that, the orientation or positional relation indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relation shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model indicated or implied by the device or element to have a particular orientation, to be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the features limited by "first" and "second" can be explicitly or implicitly included one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0041] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0042] The brush seal structure 1 with elastic front plate according to the embodiment of the utility model is described below with reference to the drawings.

[0043] As shown in Figures 1-13 The brush seal structure 1 with elastic front plate according to the embodiment of the utility model includes a front plate 10, a back plate 20, a brush filament bundle 30 and an elastic member 40.

[0044] The back plate 20 is located behind the front plate 10 (the front and rear and the inner and outer directions are shown by arrows in the drawings). The brush filament bundle 30 is clamped between the front plate 10 and the back plate 20. The elastic member 40 is a circular ring, the elastic member 40 is arranged on the front plate 10, the rear surface of the elastic member 40 abuts against the brush filament bundle 30, a plurality of elastic notches 41 are arranged on the elastic member 40, the elastic notches 41 are in communication with the front edge of the elastic member 40.

[0045] Specifically, the fluid flows from front to back, the front plate 10 is on the high pressure side and the back plate 20 is on the low pressure side.

[0046] According to the brush seal structure 1 with the elastic front plate provided in the embodiment of the present application, the elastic element 40 is arranged, the elastic element 40 is in abutment with the front plate 10 and the brush filament bundle 30 respectively, the elastic element 40 can provide a pressing force to the brush filament bundle 30, the vibration phenomenon of the brush filament bundle 30 is inhibited, the vibration of the brush filament bundle 30 under the action of the airflow is prevented, the sealing performance is affected, the leakage amount is reduced, the abrasion caused by the vibration of the brush filament bundle 30 is reduced, and the service life of the brush seal structure 1 with the elastic front plate is prolonged.

[0047] Moreover, the elastic element 40 is arranged, the elastic element 40 is in abutment with the brush filament bundle 30 directly, compared with the mode of providing the pressing force to the brush filament bundle by the pressure ring in the related art, on the one hand, the elastic element 40 is adopted to apply the pressing force, compared with the mode of driving by the airflow, the stress of the brush filament bundle 30 is more stable, so that the abrasion is reduced under the condition of ensuring the pressing effect, on the other hand, compared with the mode of driving the pressure ring by the elastic element, the pressure ring can be omitted, the relative displacement between the pressure ring and the elastic element is avoided, the frequent friction between the pressure ring and the brush filament bundle is avoided, the relative displacement between the brush filament bundle 30 and the elastic element 40 is less likely to occur, the abrasion of the brush filament bundle 30 caused by the relative displacement between the pressure ring and the brush filament bundle is prevented, and thus the abrasion speed of the brush filament bundle 30 is reduced, and the service life of the brush seal structure 1 with the elastic front plate is prolonged.

[0048] In addition, the plurality of elastic notches 41 are arranged on the elastic element 40, the flexibility of the elastic element 40 is improved, the elastic element 40 is more likely to be elastically deformed, compared with the brush seal structure in the related art, when the amplitude of the brush filament bundle 30 is small, the elastic element 40 can still be elastically deformed sufficiently, the elastic element 40 can adapt to the vibration of the brush filament bundle 30 sufficiently, and the abrasion speed caused by the excessive pressing force is avoided.

[0049] Therefore, the brush seal structure 1 with the elastic front plate provided in the embodiment of the present application has the advantages of good sealing effect, long service life and the like.

[0050] The brush seal structure 1 with the elastic front plate according to the embodiment of the present application is described below with reference to the accompanying drawings.

[0051] In some embodiments of the present application, as shown in Figures 1-13 The brush seal structure 1 with the elastic front plate according to the embodiment of the present application comprises a front plate 10, a back plate 20, a brush filament bundle 30 and an elastic element 40.

[0052] Advantageously, as shown in Figure 2 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 10 , Figure 11 , Figure 13As shown, the rear surface of the elastic element 40 is constructed as an arc-shaped surface that bulges rearward from the radial center compared to the radial inner and outer edges. This reduces the contact area between the elastic element 40 and the brush bristle bundle 30, thereby reducing the friction between the brush bristle bundle 30 and the elastic element 40, reducing the wear rate between the brush bristle bundle 30 and the elastic element 40, and further extending the service life of the brush seal structure 1 with the elastic front plate.

[0053] In some embodiments, such as Figures 1-4 As shown, the elastic member 40 includes a rear abutment portion 42, a compression portion 43, and a folded-back portion 44. The rear surface of the rear abutment portion 42 abuts against the brush bristle bundle 30. The compression portion 43 extends forward and radially outward from the rear abutment portion 42. The folded-back portion 44 folds back from the front edge of the compression portion 43. The rear surface of the front plate 10 is provided with a mounting groove 13, and the radially outer surface of the mounting groove 13 is provided with a positioning groove 14. The folded-back portion 44 fits into the positioning groove 14. Specifically, an elastic notch 41 can be provided on the compression portion 43 and the folded-back portion 44 to facilitate elastic deformation of the elastic member 40. In this way, the positioning and installation of the elastic member 40 can be achieved by the cooperation of the folded-back portion 44 and the positioning groove 14, the relative movement of the rear abutment portion 42 and the folded-back portion 44 can be achieved by the elastic deformation of the compression portion 43, and the clamping force of the brush bristle bundle 30 can be provided by the abutment of the rear abutment portion 42 against the brush bristle bundle 30.

[0054] In other embodiments, such as Figures 5-7 As shown, the elastic member 40 includes a rear abutment portion 42, a front abutment portion 45, and a compression portion 43. The rear surface of the rear abutment portion 42 abuts against the brush bristle bundle 30. The front surface of the front abutment portion 45 abuts against the front plate 10. The compression portion 43 is connected to both the front abutment portion 45 and the rear abutment portion 42, and the compression portion 43 has a V-shaped cross-section perpendicular to its circumference. Specifically, an elastic notch 41 may be provided on the compression portion 43 and the front abutment portion 45 to facilitate elastic deformation of the elastic member 40, and the front abutment portion 45 and the rear abutment portion 42 are coaxially arranged to reduce the radial displacement of the rear abutment portion 42. In this way, the positioning and installation of the elastic member 40 can be achieved by the contact between the front abutment part 45 and the front plate 10, the relative movement between the rear abutment part 42 and the front abutment part 45 can be achieved by the elastic deformation of the compression part 43, and the clamping force of the brush bristle bundle 30 can be provided by the contact between the rear abutment part 42 and the brush bristle bundle 30.

[0055] In other embodiments, such as Figures 8-10As shown, the elastic member 40 comprises a rear abutting portion 42, a front connecting portion 46 and a compression portion 43. The rear surface of the rear abutting portion 42 abuts against the brush filament bundle 30. The front plate 10 comprises a front plate body 11 and a positioning portion 12, and the front connecting portion 46 is clamped between the front plate body 11 and the positioning portion 12. The compression portion 43 is connected to the front connecting portion 46 and the rear abutting portion 42 respectively, and the compression portion 43 is Z-shaped in the cross section perpendicular to the circumferential direction of the compression portion 43. Specifically, the elastic notch 41 can be arranged on the compression portion 43 and the front connecting portion 46 to facilitate the elastic deformation of the elastic member 40. In this way, the positioning and installation of the elastic member 40 can be realized by the cooperation of the front connecting portion 46 and the front plate 10, the relative movement of the rear abutting portion 42 and the front connecting portion 46 can be realized by the elastic deformation of the compression portion 43, and the abutting of the rear abutting portion 42 against the brush filament bundle 30 can provide the pressing force for the brush filament bundle 30.

[0056] In other embodiments, as Figures 11-13 As shown, the elastic member 40 comprises a rear abutting portion 42, a front connecting portion 46 and a compression portion 43. The rear surface of the rear abutting portion 42 abuts against the brush filament bundle 30. The front plate 10 comprises a front plate body 11 and a positioning portion 12, and the front connecting portion 46 is clamped between the front plate body 11 and the positioning portion 12. The compression portion 43 is connected to the front connecting portion 46 and the rear abutting portion 42 respectively, and the compression portion 43 is step-shaped in the cross section perpendicular to the circumferential direction of the compression portion 43. Specifically, the elastic notch 41 can be arranged on the compression portion 43 and the front connecting portion 46 to facilitate the elastic deformation of the elastic member 40. In this way, the positioning and installation of the elastic member 40 can be realized by the cooperation of the front connecting portion 46 and the front plate 10, the relative movement of the rear abutting portion 42 and the front connecting portion 46 can be realized by the elastic deformation of the compression portion 43, and the abutting of the rear abutting portion 42 against the brush filament bundle 30 can provide the pressing force for the brush filament bundle 30.

[0057] Specifically, the elastic member 40 can be manufactured by pressurization and bending forming.

[0058] In some embodiments, the elastic member 40 is welded to the front plate 10. In this way, the connection strength and stability of the elastic member 40 and the front plate 10 can be improved, and displacement of the elastic member 40 can be avoided to slow down the wear.

[0059] Advantageously, as Figure 2 , Figure 5 , Figure 8 and Figure 11As shown, the front surface of the back plate 20 is provided with a groove 21. In this way, the influence of mechanical forces such as airflow or vibration on the brush bundle 30 can be reduced by using the groove 21, the displacement or deformation of the brush bundle 30 itself can be reduced, the friction between the brush bundle 30 and the back plate 20 can be reduced, the wear rate of the brush bundle 30 can be reduced, the hysteresis effect and the stiffening effect of the brush seal structure 1 with the elastic front plate can be reduced, and the brush bundle 30 can be provided with a certain elastic deformation space, so that the brush bundle 30 can adapt to problems such as rotor thermal deformation, manufacturing errors, and radial runout, maintain the sealing gap, and ensure the sealing effect.

[0060] More advantageously, the rear surface of the elastic member 40 is provided with a self-lubricating coating. In this way, the friction and wear rate between the elastic member 40 and the brush bundle 30 can be further reduced.

[0061] Optionally, the elastic member 40 is a bent plate member and the thickness of the plate is 0.2-1 mm. In this way, the elastic member 40 can have good elasticity, and the elastic member 40 can fully rebound to adapt to the vibration of the brush bundle 30, thereby improving the vibration suppression effect on the brush bundle 30.

[0062] Other configurations and operations of the brush seal structure 1 with the elastic front plate according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0063] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

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

Claims

1. A brush seal with a resilient front plate, characterized in that, The utility model relates to a brush head, comprising: a front plate; a back plate located behind the front plate; a bundle of brush filaments clamped between the front plate and the back plate; a resilient member in the shape of a circular ring, the resilient member being provided on the front plate, a rear surface of the resilient member abutting against the bundle of brush filaments, and a plurality of resilient notches being provided on the resilient member at intervals along the circumferential direction of the resilient member, the resilient notches being in communication with the front edge of the resilient member.

2. The brush seal with resilient front plate of claim 1, wherein, The rear surface of the resilient member is configured as an arc surface that is convex rearward compared to the two radial edges.

3. The brush seal with resilient front plate of claim 1, wherein, The resilient member comprises: a rear abutting portion, a rear surface of the rear abutting portion abutting against the bundle of brush filaments; a compression portion, the compression portion extending forward and to the radial outside from the rear abutting portion; a backfolding portion, the backfolding portion being backfolded from the front edge of the compression portion, a rear surface of the front plate being provided with a mounting groove, a radially outer surface of the mounting groove being provided with a positioning groove, and the backfolding portion being fitted in the positioning groove.

4. The brush seal with a resilient front plate of claim 1, wherein, The resilient member comprises: a rear abutting portion, a rear surface of the rear abutting portion abutting against the bundle of brush filaments; a front abutting portion, a front surface of the front abutting portion abutting against the front plate; a compression portion, the compression portion being connected to the front abutting portion and the rear abutting portion respectively, and the compression portion being V-shaped in a cross section perpendicular to the circumferential direction of the compression portion.

5. The brush seal with a resilient front plate of claim 1, wherein, The resilient member comprises: a rear abutting portion, a rear surface of the rear abutting portion abutting against the bundle of brush filaments; a front connecting portion, the front plate comprising a front plate body and a positioning portion, and the front connecting portion being clamped between the front plate body and the positioning portion; a compression portion, the compression portion being connected to the front connecting portion and the rear abutting portion respectively, and the compression portion being Z-shaped in a cross section perpendicular to the circumferential direction of the compression portion.

6. The brush seal with a resilient front plate of claim 1, wherein, The resilient member comprises: a rear abutting portion, a rear surface of the rear abutting portion abutting against the bundle of brush filaments; a front connecting portion, the front plate comprising a front plate body and a positioning portion, and the front connecting portion being clamped between the front plate body and the positioning portion; a compression portion, the compression portion being connected to the front connecting portion and the rear abutting portion respectively, and the compression portion being step-shaped in a cross section perpendicular to the circumferential direction of the compression portion.

7. The brush seal with a resilient front plate of claim 1, wherein, The resilient member is welded to the front plate.

8. The brush seal with a resilient front plate of claim 1, wherein, A front surface of the back plate is provided with a groove.

9. The brush seal with a resilient front plate of claim 1, wherein, A rear surface of the resilient member is provided with a self-lubricating coating.

10. The brush seal with a resilient front plate of claim 1, wherein, The resilient member is a bent plate member, and the thickness of the plate member is 0.2-1 mm.

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