A sealing sheet and a foil sealing structure

Abstract

This utility model relates to the field of high-temperature and high-pressure fluid dynamic sealing technology, specifically to a sealing sheet and a foil sealing structure, including a sealing sheet body. One end of the sealing sheet body has a tenon structure, and the other end has two bending structures on both sides, namely a first bending structure and a second bending structure, which are symmetrically arranged. The sealing sheet body is elongated. This utility model has a simpler processing technology and significantly reduced costs, improving the connection strength between the foil and the shell while enhancing the flexible compensation capability of the foil seal.

Description

Technical Field

[0001] This utility model relates to the field of high temperature and high pressure fluid dynamic sealing technology, specifically to a sealing sheet and a foil sealing structure. Background Technology

[0002] Dynamic seals for high-temperature and high-pressure gases mainly include comb seals, honeycomb seals, and brush seals. The core function of the seal is to minimize the leakage of the sealing medium per unit time under the same conditions.

[0003] Comb seals are made by setting several thin teeth in the fluid flow channel between the housing and the rotating shaft to form a tortuous path. The fluid is throttled multiple times as it passes through, thus achieving the purpose of sealing. The sealing effect of a single tooth is very poor, and a large axial length is often required to arrange many teeth to achieve the sealing effect.

[0004] Honeycomb seals are rigid seals without elastic compensation. Their principle is to form a honeycomb-shaped rough wall in the fluid flow channel to increase fluid resistance, thereby reducing leakage. However, they have a large gap with the rotating shaft, resulting in a large leakage.

[0005] Brush seals consist of tightly arranged metal bristles as their elastic sealing body. They are complex to manufacture and costly. In addition, the bristles have low strength, are easy to fall off, and cause severe abrasion to the shaft. Utility Model Content

[0006] To address the aforementioned issues, this invention provides a sealing sheet and a foil sealing structure that can adapt to situations with small radial and axial dimensions, has a simpler processing technology, significantly reduces costs, and improves the connection strength between the foil and the housing while enhancing the flexible compensation capability of the foil seal. It can be used in various applications such as shaft seals and linear seals.

[0007] This utility model provides a sealing sheet, including a sealing sheet body. One end of the sealing sheet body is provided with a tenon structure, and the other end of the sealing sheet body is provided with two bending structures, namely a first bending structure and a second bending structure, which are symmetrically arranged.

[0008] The sealing sheet body is long and narrow.

[0009] Preferably, the tenon structure is provided on one side of the end of the sealing sheet body.

[0010] Preferably, there are two tenon structures, which are located in the middle of one end of the sealing sheet body.

[0011] Preferably, the two sides of the middle part of the sealing sheet body are provided with grooves that are recessed towards the inside of the sealing sheet body.

[0012] Preferably, a gap is provided on one end of the sealing sheet body with the bending structure, and the first bending structure and the second bending structure are located on both sides of the gap.

[0013] A foil sealing structure includes a front plate and a rear plate and a sealing sheet. A sealing shell is fixedly disposed between the front plate and the rear plate. The sealing shell is fixedly and sealed to both the front plate and the rear plate. A tenon structure is provided on the sealing shell.

[0014] Multiple sealing sheets are stacked in the area between the front plate and the rear plate, and each sealing sheet is connected to the tenon structure on the sealing housing by a tongue-and-groove structure.

[0015] The sealing sheet is inclinedly disposed in the area between the front plate and the rear plate along the stacking direction, and one end with a bent structure extends out from the area between the front plate and the rear plate to form a dense sealing surface.

[0016] Preferably, the front plate and the rear plate are parallel ring plates, straight plates, or corrugated plates.

[0017] The processing technology of this utility model is simpler and the cost is greatly reduced. It improves the connection strength between the foil and the shell while enhancing the flexible compensation capability of the foil seal.

[0018] This invention can also form curved sealing strips in different directions for use in special applications of curved surface sealing.

[0019] In this invention, the front and rear plates of each plate shield most of the area in the direction of medium flow, leaving only a very small area close to the sealed surface, thereby improving the sealing performance.

[0020] This utility model of double-tenon foil seal improves the connection strength and reliability between the double-tenon structure sealing shell and the sealing sheet.

[0021] This utility model of single-tenon foil seal can adapt to smaller installation space environments;

[0022] The annular foil sealing ring and the linear foil sealing strip of this invention can be used for different occasions such as shaft sealing and planar sealing, and are more adaptable to a wider range of applications. Attached Figure Description

[0023] Figure 1 This is a cross-sectional schematic diagram of a foil sealing structure according to the present invention.

[0024] Figure 2 This is a cross-sectional schematic diagram of another foil sealing structure of this utility model.

[0025] Figure 3 This is a side cross-sectional view of one arrangement of sealing strips in a foil sealing structure.

[0026] Figure 4 This is a side cross-sectional view showing another arrangement of the sealing strip in a foil sealing structure.

[0027] Figure 5 This is a schematic diagram of a foil sealing structure according to the present invention.

[0028] Figure 6 This is a schematic diagram of another foil sealing structure of this utility model.

[0029] Figure 7 This is a schematic diagram of the third type of foil sealing structure of this utility model.

[0030] Figure 8 This is a schematic diagram of the fourth foil sealing structure of this utility model.

[0031] Figure 9 This is a schematic diagram of the fourth foil sealing structure of this utility model.

[0032] Figure 10 This is a schematic diagram of the fifth foil sealing structure of this utility model.

[0033] Figure 11 This is a schematic diagram of the working state of this utility model.

[0034] Figure 12 This is a schematic diagram of another working state of the present invention.

[0035] Reference numerals: 1-Sealed housing, 2-Sealing sheet, 3-Front plate, 4-Rear plate, 101-Double tenon structure, 102-Bending structure, 501-Single tenon structure, 9-Casing, 10-Foil sealing structure, 11-Rotor shaft. Detailed Implementation

[0036] The present invention will be described below with reference to the accompanying drawings.

[0037] See Figure 1 , Figure 2 As shown, this utility model provides a sealing sheet 2, which includes a sealing sheet 2 body. One end of the sealing sheet 2 body is provided with a tenon structure, and the other end of the sealing sheet 2 body is provided with two bending structures 102, namely a first bending structure and a second bending structure. The first bending structure and the second bending structure can be symmetrically arranged or asymmetrically arranged as needed.

[0038] The sealing sheet 2 has a long strip shape.

[0039] In one embodiment, the tenon structure is provided on one side of the end of the sealing sheet 2 body, forming a single tenon structure 501, such as... Figure 2As shown, the single tenon structure 501 further shortens the axial dimension, making it suitable for extremely small axial installation spaces.

[0040] In one embodiment, two tenon structures are provided, located at the middle of one end of the sealing sheet 2 body. These two tenon structures can be arranged symmetrically or asymmetrically as needed, forming a double tenon structure 101 to connect the sealing sheet 2 with the tenon on the sealing housing 1. Figure 1 As shown, the double tenon structure 101 has high connection strength, which reduces and simplifies the manufacturing process.

[0041] In one embodiment, grooves are provided on both sides of the middle part of the sealing sheet 2 body, which are recessed towards the interior of the sealing body.

[0042] The bending radii of the first and second bending structures can be set as needed, and they can be equal or unequal.

[0043] In one embodiment, a gap is provided on one end of the bending structure 102 of the sealing sheet 2 body, and the first bending structure and the second bending structure are located on both sides of the gap, respectively.

[0044] The first and second bending structures can be configured as follows, depending on the requirements:

[0045] Method 1: The first bending structure and the second bending structure are symmetrically arranged about the gap;

[0046] Method 2: The first bending structure and the second bending structure are asymmetrically arranged with respect to the gap.

[0047] In one embodiment, the length of the gap in the length direction of the sealing sheet 2 body is less than the length of the first bending structure or the second bending structure in the length direction of the sealing sheet 2 body.

[0048] The lengths of the first bending structure and the second bending structure in the length direction of the sealing sheet 2 body can be equal or unequal.

[0049] See Figures 1-8 As shown, a foil sealing structure 10 includes a front plate 3, a rear plate 4, and a sealing sheet 2. A sealing housing 1 is fixedly disposed between the front plate 3 and the rear plate 4. The sealing housing 1 is fixedly and sealed to both the front plate 3 and the rear plate 4. A tenon structure is provided on the sealing housing 1.

[0050] Multiple sealing sheets 2 are stacked in the area between the front plate 3 and the rear plate 4, and each sealing sheet 2 is connected to a tenon structure on the sealing housing 1 via a tongue-and-groove structure; the side view of the sealing sheet 2 arranged between the front plate 3 and the rear plate 4 is as follows: Figure 3 , Figure 4As shown. The function of the front plate 3 and the rear plate 4 is to enhance the axial strength and increase the sealing performance at the root of the foil seal; the front plate 3 and the rear plate 4 shield the root, greatly improving the sealing performance.

[0051] The sealing sheet 2 is inclinedly disposed in the area between the front plate 3 and the rear plate 4 along the stacking direction, and one end of the bent structure 102 extends out from the area between the front plate 3 and the rear plate 4 to form a dense sealing surface. The inclined placement of the sealing sheet 2 improves the flexibility compensation capability of the foil seal.

[0052] In one embodiment, the front plate 3 and the rear plate 4 are annular plates, straight plates, or corrugated plates arranged parallel to each other.

[0053] The front plate 3 and the rear plate 4 are parallel annular plates, with a double tenon structure 101 sealing sheet 2 inside, forming a double tenon foil sealing ring, as shown in the figure. Figure 5 As shown;

[0054] The front plate 3 and the rear plate 4 are parallel annular plates, with a sealing sheet 2 of single tenon structure 501 inside, forming a single tenon foil sealing ring, the structure of which is as follows. Figure 6 As shown;

[0055] The front plate 3 and the rear plate 4 are straight plates arranged parallel to each other. A sealing sheet 2 with a double tenon structure 101 is installed inside each plate, forming a double tenon foil sealing strip, as shown in the diagram. Figure 7 As shown;

[0056] The front plate 3 and the rear plate 4 are straight plates arranged parallel to each other. A sealing sheet 2 with a single tenon structure 501 is installed inside each plate, forming a single tenon foil sealing strip, as shown in the diagram. Figure 8 As shown;

[0057] The front plate 3 and the rear plate 4 are corrugated plates arranged parallel to each other, and a sealing plate 2 with a single tenon structure 501 or a double tenon structure 101 is installed inside them, as shown in the figure. Figure 9 and Figure 10 As shown, this utility model can be used in special occasions for sealing certain curved surfaces.

[0058] When this utility model is used, the structure is as follows: Figure 11 , Figure 12 As shown, in the direction of medium flow, the front plate 3 and the rear plate 4 block most of their areas, leaving only a very small area close to the sealed surface, which improves the sealing performance. That is, only the very small area close to the sealing surface between the casing 9 and the rotor shaft 11 may leak, while other areas are blocked by the sealing housing 1 and the front plate 3 and the rear plate 4, which improves the reliability of the seal.

Claims

1. A sealing sheet comprising a sealing sheet body, characterized by, One end of the sealing sheet body is provided with a tenon structure, and the other end of the sealing sheet body is provided with two bending structures, namely a first bending structure and a second bending structure, which are symmetrically arranged. The sealing sheet body is long and narrow.

2. The sealed sheet of claim 1, wherein The tenon structure is located on one side of the end of the sealing sheet body.

3. The sealed sheet of claim 1, wherein The tenon structure is configured as two, and the two tenon structures are located in the middle of one end of the sealing sheet body.

4. The sealed sheet of claim 1, wherein The sealing sheet body has grooves on both sides of its middle section that are recessed towards the interior of the sealing body.

5. The sealed sheet of claim 1, wherein The sealing sheet body has a gap at one end where a bending structure is provided, and the first bending structure and the second bending structure are located on both sides of the gap, respectively.

6. A foil sealing structure, comprising a front plate and a rear plate and a sealing sheet as described in any one of claims 1-5, wherein a sealing housing is fixedly disposed between the front plate and the rear plate, the sealing housing is fixedly and sealedly connected to both the front plate and the rear plate, and a tenon structure is provided on the sealing housing; Multiple sealing sheets are stacked in the area between the front plate and the rear plate, and each sealing sheet is connected to the tenon structure on the sealing housing by a tongue-and-groove structure. The sealing sheet is inclinedly disposed in the area between the front plate and the rear plate along the stacking direction, and one end with a bent structure extends out from the area between the front plate and the rear plate to form a dense sealing surface.

7. The foil seal structure of claim 6, wherein, The front plate and the rear plate are parallel ring plates, straight plates, or wave plates.

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