High-temperature-resistant flexible connection device

Abstract

The invention discloses a high-temperature-resistant flexible connection structure which is mainly composed of a flange, a front guide cylinder, a rear guide cylinder, a skin, heat preservation cotton, an annular movable steel bar frame and the like. The front guide cylinder has two layers and is divided into an inner cylinder and an outer cylinder; one end of the annular movable steel bar frame is fixed on the rear guide cylinder, and the other end is sleeved outside the inner cylinder of the front guide cylinder and can freely slide along the axial direction of the guide cylinder. And a gap is formed between the front guide cylinder and the rear guide cylinder and is filled with heat-insulating cotton. The skin is made of a multi-layer composite material which comprises a flame-retardant fluorine adhesive tape, a stainless steel wire net, aluminum foil cloth, high-silica refractory fiber cloth, first ceramic fiber cloth, aluminum silicate fiber felt and second ceramic fiber cloth from outside to inside, the first four layers are used for guaranteeing the strength and sealing performance of the skin, and the last three layers are used for insulating heat. The flanges at the two ends of the pipeline flexible connector can relatively move in a certain range in the axial direction and the transverse direction, can resist the high temperature of 600 DEG C, can bear certain pipeline positive pressure or negative pressure, and is suitable for connection of inlet and outlet pipelines of a large high-temperature ventilator.

Description

Technical Field

[0001] The patent of this invention relates to the field of high-temperature fans and high-temperature gas pipelines, and specifically to a high-temperature resistant flexible connection device. Background Art

[0002] Wind tunnels for performance testing of large high-temperature centrifugal fans are generally of the reflux type. In order to absorb the high-temperature deformation of the pipeline during the test, to facilitate the installation of the tested fan, and to reduce the difficulty of fan installation, a soft connection is required between the fan inlet and outlet and the test pipeline. In addition to being able to meet the functions of axial expansion and contraction and lateral displacement, this soft connection must also be able to withstand high temperatures (such as 600°C) and certain positive and negative pressures in the pipeline. This kind of soft connection with performance requirements is also in great demand in high-temperature gas pipelines in industries such as metallurgy and petrochemicals.

[0003] Soft connectors are usually made of flexible materials that can absorb the deformation of the pipeline system within a certain range while providing the necessary sealing and pressure resistance. However, under high temperature conditions, conventional soft connector materials such as rubber and polymers are prone to failure due to high temperature aging or even fire. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, the present invention provides a high temperature resistant flexible connection structure to meet the requirements of the fan inlet and outlet connection in the high temperature large fan test pipeline, improve the flexible connection deformation capacity, high temperature resistance, sealing, and small interference to the flow in the pipe. The specific technical scheme is as follows: A high temperature resistant flexible connection device comprises a front flange, a front short cylinder, a skin, a bolt kit, a first skin pressure ring, a front guide tube, thermal insulation cotton, a rear short cylinder, a rear guide tube, a second skin pressure ring, an annular movable steel bar frame and a rear flange. The front short cylinder is welded and fixed to the front flange, and the rear short cylinder is welded and fixed to the rear flange; the first skin pressure ring, the second skin pressure ring and the bolt kit fix the skin to the front short cylinder and the rear short cylinder.

[0005] Furthermore, the front guide tube and the rear guide tube are fixed to the front short cylinder and the rear short cylinder respectively by welding.

[0006] Furthermore, the front guide cylinder is a double-layer structure, which is divided into an inner cylinder and an outer cylinder, and the diameter of the inner cylinder of the front guide cylinder is smaller than the diameter of the rear guide cylinder.

[0007] Furthermore, one end of the annular movable steel bar frame is fixed on the rear guide cylinder, and the other end is freely sleeved on the outer side of the inner cylinder of the front guide cylinder.

[0008] Furthermore, there is a gap between the front guide tube and the rear guide tube, and thermal insulation cotton is filled between the front and rear guide tubes and between the rear guide tube and the skin.

[0009] Furthermore, the thermal insulation cotton is made of ceramic fiber cloth wrapped with aluminum silicate fiber cotton to form a sleeve shape.

[0010] Furthermore, the skin is made of multiple layers of composite high temperature resistant materials, which are flame retardant fluorine rubber cloth, stainless steel wire mesh, aluminum foil cloth, high silica refractory fiber cloth, first ceramic fiber cloth, aluminum silicate fiber felt and second ceramic fiber cloth from outside to inside.

[0011] Furthermore, the annular movable steel bar frame is composed of two steel rings at the front and rear ends and multiple steel bars, and the two ends of the steel bars are flexibly connected by sleeves on the steel rings at the two ends; the rear end steel ring is fixedly connected to the rear guide tube, and the front end steel ring is sleeved on the outer wall of the inner tube of the front guide tube.

[0012] Furthermore, it also includes multiple sets of long threaded rod kits, which are evenly distributed around the flange. Before installation, the long threaded rod kit connects and fixes the front flange and the rear flange. During the installation process, the long threaded rod kit adjusts the distance between the two flanges. When the installation is completed and the flexible connection device works normally, the long threaded rod kit is removed. Beneficial Effects

[0013] 1) The high temperature resistant flexible connection device of the present invention is designed with two front and rear guide tubes. The front and rear guide tubes will not interfere with each other during normal operation. Combined with the flexible skin, the flexible connection device allows the flanges at both ends to move within a certain range in the axial and lateral directions, thereby absorbing the deformation of the pipeline and facilitating the connection of the inlet and outlet pipelines when suitable for high temperature fan testing.

[0014] 2) The front guide tube has a double-layer design, which is divided into an outer guide tube and an inner guide tube. The outer tube supports the flexible skin and increases the skin's ability to withstand the negative pressure of the pipeline; the diameter of the inner tube is smaller than that of the rear guide tube, which makes the airflow flow through the soft connection pipe section smoother and reduces the impact of high-temperature hot air on the insulation layer and skin.

[0015] 3) The annular movable steel bar frame can prevent the insulation cotton stuffed between the front and rear guide tubes and the outside of the rear guide tube from seriously protruding into the pipeline, reducing the impact of the soft connection pipe section on the flow, and at the same time avoiding the insulation cotton from being washed into the airflow and damaged early, thereby extending the service life of the soft connection.

[0016] 4) Use skin pressing ring to fix the skin tightly on the short cylinders of the front and rear flanges, so that the connection between the skin and the front and rear short cylinders fits tightly, ensuring good sealing of the connection.

[0017] 5) The materials used for the multi-layer composite skin are all flexible and have good high temperature resistance. The aluminum foil ensures the air tightness of the skin, the stainless steel wire mesh and high silica refractory fiber cloth ensure the tensile strength of the skin, and the other layers give the skin a certain degree of heat insulation and environmental corrosion resistance. This skin can withstand temperatures above 600°C and can withstand higher positive pressure inside the pipe.

[0018] In summary, the high-temperature resistant flexible connection device of the present invention adopts a high-strength, high-temperature resistant flexible composite skin, two front and rear guide tubes, an annular movable steel bar frame and a filling insulation material design. The skin is fixed with a pressure ring with good sealing properties, so that the flexible connection allows large axial and lateral deformation, has the ability to withstand a certain positive and negative pressure in the pipeline and excellent high-temperature resistance, and has the characteristic of little interference with the flow in the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the high temperature resistant flexible connection device of the present invention; Figure 2 This is a schematic diagram of the skin structure; Figure 3 It is a schematic diagram of the annular movable steel bar frame structure; Figure 4 3D schematic diagram of high temperature resistant soft connection structure.

[0020] Meaning of the reference numerals: 1-front flange; 2-front short cylinder; 3-skin; 4-bolt kit; 5-first skin pressure ring; 6-front guide tube; 7-insulation cotton; 8-rear short cylinder; 9-long threaded rod kit; 10-rear guide tube; 11-second skin pressure ring; 12-annular movable steel bar frame; 13-rear flange; 31-flame retardant fluorine adhesive tape; 32-stainless steel wire mesh; 33-aluminum foil cloth; 34-high silica refractory fiber cloth; 35-first ceramic fiber cloth; 36-aluminum silicate felt; 37-second ceramic fiber cloth. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the high temperature resistant flexible connection device of the present invention is composed of the following parts: front flange 1, front short cylinder 2, skin 3, bolt kit 4, first skin pressure ring 5, front guide tube 6, insulation cotton 7, rear short cylinder 8, long threaded rod kit 9, rear guide tube 10, second skin pressure ring 11, annular movable steel bar frame 12 and rear flange 13. Except for the skin 3 and insulation cotton 7, other parts are made of high temperature resistant stainless steel material.

[0023] The front short cylinder 2 is welded and fixed on the front flange 1, and the rear short cylinder 8 is welded and fixed on the rear flange 2; the skin 3 is fixed on the front short cylinder 2 and the rear short cylinder 8 by using the first skin pressing ring 5, the second skin pressing ring 11 and the bolt kit 4. The fixed connection between the skin and the flange can ensure the reliability of the connection and the sealing of the connection.

[0024] The front guide tube 6 and the rear guide tube 10 are fixed to the front short cylinder 2 and the rear short cylinder 8 by welding, respectively. The front guide tube 6 is a double-layer structure, divided into an inner tube and an outer tube, and the diameter of the inner tube of the front guide tube 6 is smaller than the diameter of the rear guide tube 10. One end of the annular movable steel bar frame 12 is fixed to the rear guide tube 10, and the other end is freely sleeved on the outside of the inner tube of the front guide tube 6. There is a gap between the front guide tube 6 and the rear guide tube 10, and the insulation cotton 7 is filled between the front and rear guide tubes and between the rear guide tube and the skin 3. The insulation cotton 7 can be made of ceramic fiber cloth wrapped with aluminum silicate fiber cotton to form a sleeve shape for easy assembly.

[0025] When working, the airflow direction is from left to right. Since the inner diameter of the front guide tube is smaller than that of the rear guide tube, there is no serious protrusion between the front and rear guide tubes, which can reduce the obstruction and interference of the soft connection to the flow, ensure smooth flow, and at the same time reduce the erosion of the high-temperature airflow on the filled insulation cotton, reduce the risk of damage to the soft connection device, and increase the service life.

[0026] like Figure 2 As shown, the skin 3 is made of multi-layer composite high-temperature resistant materials, including flame-retardant fluorine rubber cloth 31, stainless steel wire mesh 32, aluminum foil cloth 33, high-silica refractory fiber cloth 34, first ceramic fiber cloth 35, aluminum silicate fiber felt 36 and second ceramic fiber cloth 37, a total of seven layers from outside to inside. Among them, the flame retardant fluorocarbon tape 31 is corrosion-resistant and aging-resistant and has a certain toughness, and its function is to provide environmental protection for the inner structure; the function of the stainless steel wire mesh 32 is to increase the tensile strength of the composite skin and improve the ability of the flexible connection device to withstand the positive pressure inside the pipe; the function of the aluminum foil cloth 33 is to ensure airtightness; the inorganic fiber structure of the high-silica refractory fiber cloth 34 has strong thermal stability and will not break or age due to high temperature. The high-silica refractory fiber cloth can also withstand greater mechanical stress, and its function is to ensure the skin strength under high temperature; the ceramic fiber has excellent high-temperature tolerance and can withstand temperatures as high as 1000°C. The aluminum silicate fiber material has good thermal insulation properties. The first ceramic fiber cloth 35 and the second ceramic fiber cloth 37 wrap the aluminum silicate fiber felt 36, and its function is thermal insulation.

[0027] like Figure 3 As shown, the annular movable steel bar frame is composed of two steel rings at the front and rear ends and a plurality of steel bars, and the two ends of the steel bars are flexibly connected by sleeves on the steel rings at the two ends. The rear end steel ring of the annular movable steel bar frame is fixedly connected to the rear guide tube 10, and the front end steel ring is sleeved on the outer wall of the inner tube of the front guide tube 6 without being fixed, so that the relative movement of the front and rear guide tubes is not constrained by the annular movable steel bar frame. The cross-sectional shape of the steel bar can be circular or rectangular, and should have sufficient rigidity and strength. The principle of determining the distance between the steel bars is to ensure that the thermal insulation cotton does not seriously protrude into the flow channel. For example, for a pipeline with a diameter of 1000mm, the reasonable static spacing between the steel bars is 30mm-50mm.

[0028] like Figure 4 As shown, the high temperature resistant flexible connection device of the present invention is equipped with multiple sets of long threaded rod kits 9, generally 3 or 4 sets, and the flanges are evenly distributed around the circumference. The use method and function of the long threaded rod kit are as follows: during the transportation of the flexible connection device, the long threaded rod kit connects and fixes the front flange and the rear flange to avoid damage to the flexible connection device; during the installation process, the long threaded rod kit is used to adjust the distance between the two flanges to facilitate installation; when the installation is completed and the flexible connection device works normally, the long threaded rod kit is removed, so that the flanges on both sides of the flexible connection device can be allowed to move axially and laterally within a certain range.

[0029] The assembly sequence of the components of the high temperature resistant flexible connection device is as follows: 1) Weld the front short cylinder 2 to the front flange 1, and weld the rear short cylinder 8 to the rear flange 13; 2) Weld the front guide tube 6 to the front short cylinder 2, and weld the rear guide tube 10 to the rear short cylinder 8; 3) The rear end steel ring of the annular movable steel bar frame 12 is fixed to the outer wall of the rear guide pipe 10, and the connection method can be bolt connection.

[0030] 4) The heat-insulating cotton 7 is laid on the annular movable steel bar frame 12 and the rear guide tube 10. Thus, the front and rear components of the high-temperature resistant flexible connection device are formed.

[0031] 5) Combine the front and rear components and the skin 3 together, and put the front steel ring of the annular movable steel bar frame 12 on the inner tube of the front guide tube 6.

[0032] 6) Use the first skin pressing ring 5 and the second skin pressing ring 11 to respectively fasten the front and rear ends of the skin 3 to the front short cylinder 2 and the rear short cylinder 8 to complete the assembly of the high temperature resistant flexible connection device.

[0033] The above description is only the basic idea and method of the patent of the present invention and is not intended to limit the patent of the present invention. Any modification, equivalent substitution and improvement made within the idea and principle of the patent of the present invention shall be included in the protection scope of the patent of the present invention.

Claims

1. A high temperature resistant flexible connection device, comprising a front flange (1), a front short cylinder (2), a skin (3), a bolt kit (4), a first skin pressure ring (5), a front guide tube (6), thermal insulation cotton (7), a rear short cylinder (8), a rear guide tube (10), a second skin pressure ring (11), an annular movable steel bar frame (12) and a rear flange (13), characterized in that: The front short cylinder (2) is welded and fixed on the front flange (1), and the rear short cylinder (8) is welded and fixed on the rear flange (13); the first skin pressing ring (5), the second skin pressing ring (11) and the bolt kit (4) fix the skin (3) on the front short cylinder (2) and the rear short cylinder (8).

2. The high temperature resistant flexible connection device according to claim 1, characterized in that: The front guide tube (6) and the rear guide tube (10) are respectively fixed to the front short cylinder (2) and the rear short cylinder (8) by welding.

3. The high temperature resistant flexible connection device according to claim 1, characterized in that: The front guide tube (6) is a double-layer structure, divided into an inner tube and an outer tube, and the diameter of the inner tube of the front guide tube (6) is smaller than the diameter of the rear guide tube (10).

4. The high temperature resistant flexible connection device according to claim 3, characterized in that: One end of the annular movable steel bar frame (12) is fixed to the rear guide cylinder (10), and the other end is freely sleeved on the outside of the inner cylinder of the front guide cylinder (6).

5. The high temperature resistant flexible connection device according to claim 1, characterized in that: There is a gap between the front guide tube (6) and the rear guide tube (10), and thermal insulation cotton (7) is stuffed between the front and rear guide tubes and between the rear guide tube (10) and the skin (3).

6. The high temperature resistant flexible connection device according to claim 5, characterized in that: The thermal insulation cotton (7) is made of ceramic fiber cloth wrapped with aluminum silicate fiber cotton to form a sleeve shape.

7. The high temperature resistant flexible connection device according to claim 1, characterized in that: The skin (3) is made of a multi-layer composite high-temperature resistant material, which comprises, from the outside to the inside, a flame-retardant fluorine rubber cloth (31), a stainless steel wire mesh (32), an aluminum foil cloth (33), a high-silica refractory fiber cloth (34), a first ceramic fiber cloth (35), an aluminum silicate fiber felt (36), and a second ceramic fiber cloth (37).

8. The high temperature resistant flexible connection device according to claim 3, characterized in that: The annular movable steel bar frame (12) is composed of two steel rings at the front and rear ends and a plurality of steel bars, with the two ends of the steel bars being flexibly connected by sleeves on the steel rings at the two ends; the rear end steel ring is fixedly connected to the rear guide tube (10), and the front end steel ring is sleeved on the outer wall of the inner tube of the front guide tube (6).

9. The high temperature resistant flexible connection device according to claim 1, characterized in that: It also includes a plurality of sets of long threaded rod kits (9) which are evenly distributed around the flange. Before installation, the long threaded rod kits connect and fix the front flange and the rear flange. During installation, the long threaded rod kits adjust the distance between the two flanges. When the installation is completed and the flexible connection device is working normally, the long threaded rod kits are removed.

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