A braided seal ring and method of making the same

Abstract

The application discloses a braided sealing ring and a manufacturing method thereof. The braided sealing ring is formed by cutting a braided rope body and fixing the braided rope body through a connecting head. The braided rope body is composed of a center core rope, an intermediate braided layer and an outer braided layer. The intermediate braided layer is composed of multiple sub-braided layers which are successively braided from inside to outside. Each sub-braided layer is braided by more than one strand after plying and through multiple spindles. The outer braided layer is braided by more than one strand after plying and through multiple spindles. The intermediate braided layer has good elasticity, so that the braided sealing ring has good elasticity as a whole. The outer braided layer is the outermost layer of the braided rope body and has the characteristics of high-temperature resistance, corrosion resistance and wear resistance, so that the braided sealing ring has good comprehensive performance and can meet the sealing requirements of a sealing station related to a gas turbine and an aero-engine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing, in particular to a braided sealing ring and a manufacturing method thereof. BACKGROUND

[0002] The sealing requirement of the sealing station related to the gas turbine and the aero-engine, which is praised as the "pearl on the crown", is very strict. The sealing requirement needs to be met under the extreme conditions such as high temperature, high pressure, vibration and thermal cycle. Therefore, it is necessary to independently develop an elastic sealing ring to be suitable for the sealing station related to the gas turbine and the aero-engine, to help the independent research and development of the gas turbine and the aero-engine in China, and to realize the localization. SUMMARY

[0003] The purpose of the present application is to overcome the defects of the prior art and provide a braided sealing ring to meet the sealing requirements of the sealing station related to the gas turbine and the aero-engine.

[0004] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a braided sealing ring, the sealing ring comprises a braided rope body and a connecting head, the braided rope body has a first end portion and a second end portion which are separately arranged at two different ends in the length direction, the braided rope body is arranged in a circular ring shape, so that the first end portion and the second end portion are connected along the length direction, the connecting head is fixedly connected to the first end portion and the second end portion, the braided rope body is composed of a center core rope, an intermediate braided layer and an outer braided layer, wherein the center core rope is composed of a braided rope or a plurality of strands; the intermediate braided layer is composed of n layers of sub-braided layers, the n layers of sub-braided layers are arranged in sequence from the inside to the outside with the center core rope as the center, each sub-braided layer is composed of a plurality of strands after being plied and then braided by b spindles; the outer braided layer is arranged outside the intermediate braided layer and takes the intermediate braided layer as the center, the outer braided layer is composed of a plurality of strands after being plied and then braided by d spindles; n, a, b, c and d are all positive integers.

[0005] Preferably, in the intermediate braided layer, n is greater than or equal to 2, a is greater than or equal to 1 and less than or equal to 50, and b is greater than or equal to 4 and less than or equal to 96; in the outer braided layer, c is greater than or equal to 1 and less than or equal to 50, and d is greater than or equal to 4 and less than or equal to 96.

[0006] Preferably, in the n layers of sub-braided layers, the number of strands in the innermost sub-braided layer is greater than or equal to the number of strands in the outermost sub-braided layer.

[0007] Preferably, in the two adjacent layers of sub-braided layers, the number of spindles in the inner sub-braided layer is less than the number of spindles in the outer sub-braided layer.

[0008] As a specific embodiment, the intermediate braided layer is formed by sequentially arranging 5 layers of the sub-braided layers from inside to outside, the number of strands in each of the first two layers of the sub-braided layers from inside to outside is 4, the number of strands in each of the first three layers of the sub-braided layers from outside to inside is 1, and the diameters of the strands in each of the sub-braided layers are the same or different.

[0009] Preferably, in the outer braided layer, c strands are arranged in an arc shape and are braided by d spindles to form the outer side of the intermediate braided layer in the circumferential direction.

[0010] Preferably, the material of the strands in the sub-braided layer is a high-temperature-resistant non-metallic material, and the material of the strands in the outer braided layer is a metal wire resistant to high temperature, corrosion and wear, wherein the material of the strands in the sub-braided layer is ceramic fiber, and the material of the strands in the outer braided layer is cobalt-based superalloy.

[0011] Preferably, the connecting head is in a cylindrical shape, one end of the connecting head is fixedly sleeved on the outer side of the first end portion in the circumferential direction, and the other end of the connecting head is fixedly sleeved on the outer side of the second end portion in the circumferential direction.

[0012] As a specific embodiment, the connecting head is made of a metal foil of cobalt-based superalloy or nickel-based superalloy, and the thickness of the metal foil is not greater than 0.1 mm.

[0013] Another object of the present application is to provide a manufacturing method of the braided sealing ring.

[0014] To achieve the above object, the technical scheme adopted by the present application is:

[0015] A manufacturing method of the braided sealing ring as described above, the manufacturing method comprises the following steps:

[0016] (1) selecting a braided rope or a center core rope formed by arranging a plurality of strands in parallel;

[0017] (2) taking the center core rope as a base circle, arranging a plurality of strands in parallel to form a sub-braided layer on the outer side of the center core rope in the circumferential direction, and braiding n layers of the sub-braided layers from inside to outside to form an intermediate braided layer;

[0018] (3) taking the intermediate braided layer as a base circle, arranging a plurality of strands in parallel to form an outer braided layer on the outer side of the intermediate braided layer in the circumferential direction, and forming a braided rope body;

[0019] (4) cutting the braided rope body to a set length, bending the braided rope body along the length direction to a circular ring shape so that the first end portion and the second end portion are connected, and then welding and fixing the connecting head on the first end portion and the second end portion.

[0020] By using the above technical solution, the braided sealing ring of the present application has the following advantages compared with the prior art: the braided sealing ring of the present application is formed by cutting the braided rope body and fixed by the connecting head, the braided rope body is composed of a center core rope, an intermediate braided layer and an outer braided layer, the intermediate braided layer has good elasticity so that the braided sealing ring as a whole has good elasticity, and the outer braided layer as the outermost layer of the braided rope body has the characteristics of high temperature resistance, corrosion resistance and wear resistance, so that the braided sealing ring has good comprehensive performance and can meet the sealing requirements of the sealing station related to the gas turbine and the aero-engine. BRIEF DESCRIPTION OF DRAWINGS

[0021] FIG. 1 is a schematic diagram of the overall structure of the braided sealing ring of an embodiment of the present application; Figure 1

[0022] FIG. 2 is a schematic diagram of the enlarged view of the A part of the braided sealing ring of the embodiment of the present application; Figure 2 Figure 1 FIG. 3 is a schematic diagram of the cross-sectional structure along the B-B part of the braided sealing ring of the embodiment of the present application;

[0023] FIG. 4 is a schematic diagram of the cross-sectional structure along the C-C part of the braided sealing ring of the embodiment of the present application; Figure 3 Figure 1 FIG. 5 is a schematic diagram of the external structure of the braided rope body in the braided sealing ring of the embodiment of the present application;

[0024] FIG. 6 is a schematic diagram of the cross-sectional structure of the braided sealing ring of the embodiment of the present application applied to the sealing station; Figure 4 Figure 2 FIG. 7 is a schematic diagram of the cross-sectional structure of the braided sealing ring of the embodiment of the present application applied to the sealing station;

[0025] FIG. 8 is a schematic diagram of the external structure of the braided rope body in the braided sealing ring of the embodiment of the present application; Figure 5 Figure 1 FIG. 9 is a schematic diagram of the cross-sectional structure of the braided sealing ring of the embodiment of the present application applied to the sealing station;

[0026] FIG. 10 is a schematic diagram of the cross-sectional structure of the braided sealing ring of the embodiment of the present application applied to the sealing station; Figure 6 Figure 1 FIG. 11 is a schematic diagram of the cross-sectional structure of the braided sealing ring of the embodiment of the present application applied to the sealing station;

[0027] 1, braided rope body; 1a, first end portion; 1b, second end portion; 11, center core rope; 12, intermediate braided layer; 121, 122, 123, 124, 125, sub-braided layer; 13, outer braided layer; 2, connecting head; 10, braided sealing ring; 20, first component; 30, second component. DETAILED DESCRIPTION

[0028] The technical solution of the present application will be further described below in combination with the drawings and specific embodiments.

[0029] Reference Figures 1 to 5 ​​​​​​The diagram shows a braided sealing ring, which includes a braided rope body 1 and a connector 2. The braided rope body 1 has a first end 1a and a second end 1b located at two ends opposite to each other in its length direction. The braided rope body 1 is wound in a circular shape such that the first end 1a and the second end 1b are connected along the length direction. The connector 2 is fixedly disposed on the outer periphery of the first end 1a and the outer end of the second end 1b, thereby fixing the two ends of the braided rope body 1 and forming an integral ring-shaped braided sealing ring.

[0030] The braided rope 1 consists of a central core rope 11, an intermediate braided layer 12, and an outer braided layer 13. The central core rope 11, intermediate braided layer 12, and outer braided layer 13 are arranged sequentially from the inside out; that is, the intermediate braided layer 12 wraps around the circumferential outer side of the central core rope 11, and the outer braided layer 13 wraps around the circumferential outer side of the intermediate braided layer 12. Wherein:

[0031] The central core rope 11 is composed of a braided rope or multiple strands of yarn twisted together, forming the base circle of the intermediate braided layer 12. These strands are made of twisted yarn.

[0032] The intermediate braided layer 12 consists of n sub-braided layers, where n is a positive integer, preferably a positive integer greater than or equal to 2. These n sub-braided layers are woven layer by layer from the inside out, with the central core rope 11 as the base circle. Each sub-braided layer is woven from a strands of yarn twisted together and then woven by b spindles. The strands are made of twisted yarn, and the material of the strands in this sub-braided layer is a high-temperature resistant non-metallic material, preferably ceramic fiber, capable of operating at 1100℃. Both a and b are positive integers, and preferably, 1 ≤ a ≤ 50, 4 ≤ b ≤ 96.

[0033] In these n sub-braid layers, the number of strands in the innermost sub-braid layer is greater than or equal to the number of strands in the outermost sub-braid layer; and in two adjacent sub-braid layers, the number of spindles in the inner sub-braid layer is less than the number of spindles in the outer sub-braid layer. That is to say, the number of spindles in the n sub-braid layers increases from the inside out. The intermediate braid layer 12 forms an elastomer.

[0034] The outer braided layer 13 is disposed outside the middle braided layer 12 and is braided with the middle braided layer 12 as the base circle. The outer braided layer 13 is formed by braiding c strands together and then braiding through d spindles. c and d are both positive integers, and preferably 1≤c≤50, 4≤d≤96.

[0035] In the outer braided layer 13, c strands extend in an arc shape and are braided by d spindles to form the outer circumferential outer side of the middle braided layer 12. This makes the outermost surface structure of the outer braided layer 13 smoother and flatter. The strands in the outer braided layer 13 are made of high-temperature resistant, corrosion-resistant, and wear-resistant metal wire, preferably a cobalt-based high-temperature alloy, which can operate at 1100°C.

[0036] During weaving, each of the above-mentioned sub-braided layers and the outer braided layer 13 are woven around the corresponding base circle at a set braiding angle. The braiding angles of each layer can be the same or different. The preferred range of the braiding angle is 30° to 80°. Through the interlocking and compact weaving of each layer, a braided rope 1 with a tight structure, certain strength and sealing performance is formed.

[0037] The connector 2 is cylindrical and made of a high-temperature resistant, corrosion-resistant, and wear-resistant metal foil, preferably a cobalt-based or nickel-based high-temperature alloy, capable of operating at 1100℃. One end of the connector 2 is fixedly fitted onto the circumferential outer side of the first end 1a, and the other end of the connector 2 is fixedly fitted onto the circumferential outer side of the first end 1b. The thickness of the metal foil used to make the connector 2 is no greater than 0.1mm. Thus, after using the connector 2 to fixally connect the two ends of the braided rope 1, the difference between the outer diameter of the connector 2 and the outer diameter of the braided rope 1 is no greater than 0.2mm, resulting in a relatively smooth and even outer surface of the entire braided sealing ring.

[0038] In this embodiment, see Figure 3 As shown, the central core rope 11 is formed by 11 strands braided in two layers. The intermediate braided layer 12 consists of 5 sub-braided layers arranged sequentially from the inside out: sub-braided layer 121, sub-braided layer 122, sub-braided layer 123, sub-braided layer 124, and sub-braided layer 125. Sub-braided layer 121 is formed by braiding 4 strands together with 8 spindles; sub-braided layer 122 is formed by braiding 4 strands together with 12 spindles; and sub-braided layers 123, 124, and 125 are all single strands, braided with 32, 36, and 48 spindles respectively. The outer braided layer 13 is formed by braiding 4 strands together with 48 spindles on the circumferential outer side of the intermediate braided layer 12. The diameters of the strands in the central core rope 11, the strands in each of the sub-braided layers 121 / 122 / 123 / 124 / 125, and the strands in the outer braided layer 13 can be the same or different.

[0039] The following is Figures 1 to 4The braided sealing ring of the embodiment is taken as an example to illustrate the manufacturing method of the braided sealing ring. First, the braided rope body 1 is manufactured. Specifically, the braided rope or the center core rope 11 formed by a plurality of strands is selected first, and then the sub-braided layer 121, the sub-braided layer 122, the sub-braided layer 123, the sub-braided layer 124, and the sub-braided layer 125 are sequentially braided outside the center core rope 11 to form the intermediate braided layer 12. The intermediate braided layer 12 is an elastic body and also constitutes the main part of the braided rope body 1. Then, the outer braided layer 13 is braided outside the intermediate braided layer 12 to make the braided rope body 1 have the properties of high temperature resistance, corrosion resistance, wear resistance, etc. Finally, according to the diameter of the required braided sealing ring, the braided rope body 1 is cut to the required length, and the braided rope body 1 is bent into a circular ring along the length direction, so that the first end 1a and the second end 1b are connected. The connecting head 2 is sleeved on the first end 1a and the second end 1b, and is fixed on the first end 1a and the second end 1b by welding. Thus, the required braided sealing ring is formed for sealing connection at a specific work position.

[0040] Referring to Figure 6 An application scenario of the braided sealing ring 10 is shown. The sealing device has a first component 20 and a second component 30. The second component 30 is provided with an annular sealing groove 301 on the outer periphery. The braided sealing ring 10 can be arranged in the annular sealing groove 301 for sealing between the first component 20 and the second component 30.

[0041] In summary, the braided sealing ring of the embodiment is obtained by braiding, and the manufacturing process is relatively simple. It can be used for sealing connection in a working environment below 1100℃. Through relevant experiments, the air leakage rate at the sealing position of the braided sealing ring used in the sealing device is less than 0.04Kg / m.s, which can meet the sealing requirements of related sealing positions of gas turbines and aero-engines.

[0042] The above embodiments are only for illustrating the technical concept and characteristics of the present application. The purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A braided seal ring characterized by: The sealing ring comprises a braided rope and a connecting head, the braided rope has a first end and a second end arranged at two different length directions, the braided rope is arranged in a circular ring shape, so that the first end and the second end are connected along the length direction, the connecting head is fixedly connected on the first end and the second end, the braided rope is composed of a center core rope, an intermediate braided layer and an outer braided layer, the center core rope is composed of a braided rope or a plurality of strands, the intermediate braided layer is composed of n sub-braided layers, the n sub-braided layers are arranged in sequence from inside to outside with the center core rope as the center, each sub-braided layer is formed by a plurality of strands after being braided by b spindles, the outer braided layer is arranged outside the intermediate braided layer and takes the intermediate braided layer as the center, the outer braided layer is formed by a plurality of strands after being braided by d spindles, n, a, b, c and d are positive integers, in the intermediate braided layer, n is greater than or equal to 2, a is greater than or equal to 1 and less than or equal to 50, b is greater than or equal to 4 and less than or equal to 96, in the outer braided layer, c is greater than or equal to 1 and less than or equal to 50, d is greater than or equal to 4 and less than or equal to 96, the material of the strands in the sub-braided layer is a high-temperature-resistant non-metallic material, the material of the strands in the outer braided layer is a high-temperature-resistant, corrosion-resistant and wear-resistant metal wire, the material of the strands in the sub-braided layer is ceramic fiber, and the material of the strands in the outer braided layer is cobalt-based high-temperature alloy.

2. The braided seal ring of claim 1, wherein: In the n sub-braided layers, the number of strands in the innermost sub-braided layer is greater than or equal to the number of strands in the outermost sub-braided layer.

3. The braided seal ring of claim 1, wherein: In the two adjacent sub-braided layers, the number of spindles in the inner sub-braided layer is less than the number of spindles in the outer sub-braided layer.

4. The braided seal ring of claim 1, wherein: The intermediate braided layer is composed of five sub-braided layers arranged in sequence from inside to outside, the number of strands in each of the first two sub-braided layers from inside to outside is four, the number of strands in each of the first three sub-braided layers from outside to inside is one, and the diameters of the strands in each sub-braided layer are the same or different.

5. The braided seal ring of claim 1, wherein: In the outer braided layer, the c strands are arranged in an arc shape and are braided on the outer side of the intermediate braided layer in the circumferential direction.

6. The braided seal ring of claim 1, wherein: The connecting head is in a cylindrical shape, one end of the connecting head is fixedly sleeved on the outer side of the first end in the circumferential direction, and the other end of the connecting head is fixedly sleeved on the outer side of the second end in the circumferential direction.

7. The braided seal ring of claim 6, wherein: The connecting head is made of a metal foil of cobalt-based high-temperature alloy or nickel-based high-temperature alloy, and the thickness of the metal foil is not greater than 0.1 mm.

8. A method of making a braided seal ring as claimed in any one of claims 1 to 7, characterised by: The manufacturing method comprises the following steps: (1) selecting a braided rope or a plurality of strands to form the center core rope; (2) taking the center core rope as a base circle, braiding a plurality of strands by b spindles to form the sub-braided layer on the outer side of the center core rope in the circumferential direction, and braiding n sub-braided layers in sequence from inside to outside to form the intermediate braided layer; (3) taking the intermediate braided layer as a base circle, braiding a plurality of strands by d spindles to form the outer braided layer on the outer side of the intermediate braided layer in the circumferential direction, and forming the braided rope. (4) cutting the braided rope body to a set length, bending the braided rope body along the length direction to a circular ring shape so that the first end portion and the second end portion are connected, and then welding and fixing the connecting head on the first end portion and the second end portion.

Images