Axial expansion joint

Abstract

The present invention belongs to the technical field of expansion joints, and specifically relates to an axial expansion joint, comprising a main pipeline; the main pipeline is overall arranged in a U shape, comprising two vertical tubes and a horizontal tube, one end of which is arranged as an air inlet, and the other end of which is arranged as an air outlet; an axial expansion device is installed on the two vertical tubes to provide axial compensation for the main pipeline; the present invention adds an axial expansion device on the basis of a bent pipe for axial compensation, and when gas passes through the expansion joint, the generated gas pressure will push the horizontal tube between the two axial expansion devices to move in a direction away from the axis of the source gas pipeline, thereby further eliminating the influence of the pressure, and when the threshold in the pipeline is high or the change is large, it can also effectively compensate for the axial deformation of the entire pipeline, thereby increasing the application scope of the expansion joint; the multi-stage structure of the annular magnet and the rubber tube can further increase the overall capacity of the axial expansion device, and at the same time increase the axial compensation capacity of the axial expansion device.

Description

Technical Field

[0001] The invention belongs to the technical field of expansion joints, and in particular relates to an axial expansion joint. Background Art

[0002] Expansion joints are also commonly called compensators or expansion joints. They refer to flexible elements that can effectively compensate for axial deformation. For example, the expansion joints welded on the shell of a fixed tube sheet heat exchanger have large axial flexibility and are easy to deform. They can compensate for the thermal expansion difference between the tube and the shell due to different wall temperatures, reduce their axial loads, and thus reduce the temperature difference stress of the tube, tube sheet, and shell, avoiding strength damage, instability damage, and tube pull-off damage. As an elastic compensation element that can be freely extended and retracted, the expansion joint has the advantages of reliable operation, good performance, and compact structure. It has been widely used in chemical, metallurgical, nuclear energy and other departments. There are many forms of expansion joints used on containers. In terms of the shape of the corrugation, the U-shaped expansion joint is the most widely used, followed by the Ω-shaped and C-shaped ones.

[0003] Duct rubber expansion joints are used for flexible connections between various fans and ducts. They are composed of rubber and rubber-fiber fabric composite materials, steel flanges, sleeves, and thermal insulation materials. Their functions are shock absorption, noise reduction, sealing, medium resistance, and ease of displacement and installation. They are an ideal accessory for shock absorption, noise reduction, smoke and dust removal in the field of environmental protection.

[0004] Duct rubber expansion joints use rubber and fiber fabrics as flexible parts, have good reproducibility for repeated displacement, can provide greater multi-dimensional directional compensation, and can effectively eliminate multi-directional errors generated during the installation and connection of various pipelines. At the same time, rubber and fiber fabrics have excellent air tightness and flexibility, and can ensure that the conveying medium is leak-free and can recover to its original state after repeated displacement. However, whether it is rubber or fiber fabric, its stretching range is limited. Therefore, duct rubber expansion joints are usually only suitable for directional compensation in a smaller range of sizes. When the pressure threshold in the pipeline is high or varies greatly, existing duct rubber expansion joints usually cannot provide reliable axial compensation.

[0005] In view of this, the present invention is proposed to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide an axial expansion joint. The specific problem to be solved by the present invention is that the existing air duct rubber expansion joint uses rubber and fiber fabric as the flexible part, and its stretching range is limited. It is usually only suitable for directional compensation in a smaller range of sizes. When the pressure threshold in the pipeline is high or varies greatly, the existing air duct rubber expansion joint usually cannot provide reliable axial compensation.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An axial expansion joint includes a main pipe;

[0009] The main pipe is configured as a U-shape as a whole, including two vertical pipes and one horizontal pipe, one end of which is configured as an air inlet and the other end is configured as an air outlet;

[0010] The two vertical pipes are both equipped with axial expansion and contraction devices for providing axial compensation for the main pipeline.

[0011] Preferably, the axial telescopic device is connected to the vertical pipe by a flange.

[0012] Preferably, the transverse tube and the two vertical tubes are made of stainless steel.

[0013] Preferably, the axial telescopic device comprises an annular magnet, a rubber tube, a blade and a bracket, the number of the annular magnet, the blade and the bracket is greater than one, the blade is fixed to the inner ring of the annular magnet through the bracket, and the annular magnets are fixed in pairs through the rubber tube.

[0014] Preferably, the number of the annular magnets, blades and brackets is preferably an even number, and the rotation directions of two adjacent blades are opposite.

[0015] Preferably, the rubber tube is made of EPDM.

[0016] Preferably, the axial expansion joint further comprises:

[0017] A support frame, the support frame is located between the two vertical tubes;

[0018] A connecting frame, the connecting frame comprising: a connecting ring, a connecting rod and a connecting sleeve, the connecting ring and the connecting sleeve being fixedly connected by the connecting rod;

[0019] The connecting ring is fixedly connected to the outer ring of the annular magnet at the end of the axial telescopic device at one end of the air inlet, and the connecting sleeve is fixedly connected to the outer wall of the vertical pipe at one end of the air outlet.

[0020] Preferably, the connecting rod is installed horizontally.

[0021] Preferably, the connecting frame further comprises sliding rods, the number of the sliding rods is greater than one, the sliding rods are arranged horizontally and parallel to each other, one end of the sliding rod is fixed to the connecting rod, and the other end is located in a sliding groove on the upper surface of the support frame that cooperates with the sliding rod.

[0022] Preferably, the slide rod is made of die steel.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention, by setting the main pipeline to be U-shaped, plays the role of a bent-pipe expansion joint to a certain extent, and uses the overall elastic deformation capacity of the bent pipe to resist the gas pressure in the main pipeline. At the same time, axial expansion devices are installed on the two vertical pipes. When the gas passes through the expansion joint, the generated gas pressure will push the transverse pipe between the two axial expansion devices to move away from the axis of the source gas pipeline, thereby further eliminating the influence of the pressure. The present invention adds an axial expansion device on the basis of the bent pipe for axial compensation, thereby further enhancing the axial compensation effect of the expansion joint. When the threshold in the pipeline is high or changes greatly, it can also effectively compensate for the axial deformation of the entire pipeline, thereby increasing the scope of application of the expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the present invention;

[0026] Figure 2 For the present invention Figure 1 A cross-sectional view of section AA;

[0027] Figure 3 It is a schematic diagram of the top view structure of the axial telescopic device of the present invention.

[0028] In the figure: vertical tube 1, horizontal tube 2, air inlet 3, air outlet 4, axial telescopic device 5, annular magnet 51, rubber tube 52, blade 53, bracket 54, support frame 6, slide groove 61, connecting frame 7, connecting ring 71, connecting rod 72, connecting sleeve 73, sliding rod 74. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] The embodiment of the present invention provides an axial expansion joint to solve the technical problem that the existing air duct rubber expansion joint uses rubber and fiber fabric as the flexible part, has a limited extension range, is usually only suitable for directional compensation in a small range of sizes, and cannot provide reliable axial compensation when the pressure threshold in the pipeline is high or changes greatly.

[0031] The technical solution in the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows: by adding an axial telescopic device on the basis of the bent pipe for axial compensation, the axial compensation effect of the expansion joint is further enhanced.

[0032] To better understand the technical solution of the present invention, please refer to Figures 1 to 3 ,In an embodiment of the present invention, an axial expansion joint includes a main pipe;

[0033] The main pipe is generally arranged in a U shape, including two vertical pipes 1 and a horizontal pipe 2, one end of which is arranged as an air inlet 3 and the other end is arranged as an air outlet 4;

[0034] The two vertical pipes 1 are both equipped with axial expansion and contraction devices 5 for providing axial compensation for the main pipeline.

[0035] The present invention, by setting the main pipeline to be U-shaped, plays the role of a bent-pipe expansion joint to a certain extent, and uses the overall elastic deformation ability of the bent pipe to resist the gas pressure in the main pipeline. At the same time, axial expansion devices 5 are installed on the two vertical pipes 1. When the gas passes through the expansion joint, the generated gas pressure will push the transverse pipe 2 between the two axial expansion devices 5 to move in a direction away from the axis of the source gas pipeline, thereby further eliminating the influence of the pressure. The present invention adds an axial expansion device 5 on the basis of the bent pipe for axial compensation, thereby further enhancing the axial compensation effect of the expansion joint. When the threshold in the pipeline is high or changes greatly, it can also effectively compensate for the axial deformation of the entire pipeline, thereby increasing the scope of application of the expansion joint.

[0036] As an embodiment of the present invention, the axial expansion device 5 is connected to the vertical pipe 1 by a flange;

[0037] As an embodiment of the present invention, the horizontal tube 2 and the two vertical tubes 1 are made of stainless steel;

[0038] Using stainless steel as the main material of the transverse tube 2 and the vertical tube 1 can give the expansion joint good pressure resistance and corrosion resistance to reduce maintenance costs. At the same time, the axial telescopic device 5 and the vertical tube 1 are connected by flanges. Combined with the stainless steel material of the transverse tube 2 and the vertical tube 1, better pressure resistance can be provided, thereby improving reliability and safety.

[0039] As an embodiment of the present invention, the axial telescopic device 5 includes an annular magnet 51, a rubber tube 52, a paddle 53 and a bracket 54. The number of the annular magnet 51, the paddle 53 and the bracket 54 is greater than one. The paddle 53 is fixed to the inner ring of the annular magnet 51 through the bracket 54, and the annular magnets 51 are fixed in pairs through the rubber tube 52.

[0040] As an embodiment of the present invention, the number of the annular magnets 51 , the blades 53 and the brackets 54 is preferably an even number, and the rotation directions of two adjacent blades 53 are opposite.

[0041] The rubber tube 52 is used as the connection of the annular magnet 51, which can play a certain role in buffering and shock absorbing the axial telescopic device 5 and the expansion joint as a whole. When there is no gas passing through the axial telescopic device 5, the annular magnets 51 of each level are attracted to each other, the rubber tube 52 is compressed, and the axial telescopic device 5 is tightened as a whole; when the gas passes through the axial telescopic device 5, the impact of the gas on the blade 53 will cause the blade 53 to rotate, and the power of the gas is converted into the power of the blade 53, thereby achieving the effect of reducing the impact pressure of the gas on the vertical pipe 1. At the same time, under the action of the gas impact force, the gas impact force acts on the blade 53, and the force received by the blade 53 is transmitted to the bracket 54, and then transmitted to the annular Magnet 51, each level of annular magnet 51 is opened, so that the axial telescopic device 5 is stretched, and the transverse tube 2 between the two axial telescopic devices 5 is pushed to move in the direction away from the axis of the source gas pipeline, thereby reducing the pressure in the entire pipeline and reducing the axial influence of the pressure. At the same time, the multi-stage structure of the annular magnet 51 and the rubber tube 52 can further increase the overall capacity of the axial telescopic device 5 and increase the axial compensation ability of the axial telescopic device 5; at the same time, the cooperation between the blades 53 and the annular magnet 51 is multiple and even, and the two adjacent blades 53 rotate in opposite directions, which can balance the circumferential force generated by the rotation of the blades 53, thereby maintaining the overall balance of the axial telescopic device 5.

[0042] As an embodiment of the present invention, the rubber tube 52 is made of EPDM.

[0043] The EPDM rubber has good high temperature resistance, and is also acid and alkali resistant and corrosion resistant, which can effectively increase the service life of the rubber tube 52 and reduce maintenance costs.

[0044] As an embodiment of the present invention, the axial expansion joint further includes:

[0045] A support frame 6, the support frame 6 is located between the two vertical tubes 1;

[0046] The connecting frame 7 includes: a connecting ring 71, a connecting rod 72 and a connecting sleeve 73, wherein the connecting ring 71 and the connecting sleeve 73 are fixedly connected through the connecting rod 72;

[0047] The connecting ring 71 is fixedly connected to the outer ring of the annular magnet 51 at the end of the axial telescopic device 5 at one end of the air inlet 3, and the connecting sleeve 73 is fixedly connected to the outer wall of the vertical pipe 1 at one end of the air outlet 4;

[0048] As an embodiment of the present invention, the connecting rod 72 is installed horizontally;

[0049] Through the setting of the connecting frame 7, when the axial telescopic device 5 at one end of the air inlet 3 is stretched by the impact force, under the action of the connecting frame 7, the thrust caused by the stretching tendency of the axial telescopic device 5 at the air inlet 3 acts on the transverse tube 2 at the same time, thereby driving the transverse tube 2 to move away from the axis of the source gas pipeline at the same time, and then driving the axial telescopic device 5 at one end of the air outlet 4 to extend, further increasing the overall volume of the axial telescopic device 5, thereby reducing the axial impact; the connecting rod 72 is horizontally arranged, which can maintain the horizontality of the transverse tube 2, thereby ensuring that the two axial telescopic devices 5 have the same degree of stretching, thereby avoiding any axial telescopic device 5 from being subjected to additional impact force, resulting in excessive wear. When the two axial telescopic devices are subjected to the same degree of wear, they can be maintained and replaced together, thereby reducing the frequency of downtime maintenance and improving work efficiency.

[0050] As an embodiment of the present invention, the connecting frame 7 further includes a sliding rod 74, the number of the sliding rod 74 is greater than one, the sliding rods 74 are arranged horizontally and parallel to each other, one end of the sliding rod 74 is fixed to the connecting rod 72, and the other end is located in the sliding groove 61 on the upper surface of the supporting frame 6 that cooperates with the sliding rod 74;

[0051] As an embodiment of the present invention, the slide bar 74 is made of die steel.

[0052] The slide bar 74 serves to position the connecting rod 72 and maintain the connecting rod 72 horizontally. The slide bar 74 is made of mold steel. On the one hand, the mold steel has good mechanical properties and can reduce friction loss. At the same time, reducing the wear of the slide bar 74 can also improve the surface quality of the slide bar 74 to a certain extent, thereby reducing the friction coefficient of the contact part between the slide bar 74 and the support frame 6, making the movement of the slide bar 74 relative to the support frame 6 smoother, thereby improving the response ability of the axial telescopic device 5.

[0053] Working principle: when the gas passes through the axial telescopic device 5, the impact of the gas on the blade 53 will cause the blade 53 to rotate, and the power of the gas is converted into the power of the blade 53, thereby reducing the impact pressure of the gas on the vertical pipe 1. At the same time, under the impact force of the gas, the annular magnets 51 at each level are opened, so that the axial telescopic device 5 is extended, and the transverse tube 2 between the two axial telescopic devices 5 is pushed away from the axis of the source gas pipeline, thereby reducing the pressure in the entire pipeline and reducing the axial influence of the pressure; at the same time, the blade 53 and the annular magnet 51 are matched in multiple groups and in even numbers, which can balance the circumferential force generated by the rotation of the blade 53, thereby maintaining the overall balance of the axial telescopic device 5; the connecting rod 72 is horizontally arranged, which can maintain the horizontal level of the transverse tube 2, thereby ensuring that the two axial telescopic devices 5 have the same extension degree, thereby avoiding any axial telescopic device 5 from being subjected to additional impact force, resulting in excessive wear. When the two axial telescopic devices are worn to the same degree, they can be maintained and replaced together, thereby reducing the frequency of downtime maintenance and improving work efficiency.

[0054] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not exist, the above embodiments only express several implementation methods of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several variations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An axial expansion joint, comprising a main pipe, characterized in that The main pipe is configured as a U-shape as a whole, comprising two vertical pipes (1) and a horizontal pipe (2), one end of which is configured as an air inlet (3) and the other end of which is configured as an air outlet (4); an axial telescopic device (5) is installed on each of the two vertical pipes (1) to provide axial compensation for the main pipe; The axial telescopic device (5) comprises an annular magnet (51), a rubber tube (52), a paddle (53) and a bracket (54); the number of the annular magnet (51), the paddle (53) and the bracket (54) is greater than one; the paddle (53) is fixed to the inner ring of the annular magnet (51) through the bracket (54); and the annular magnets (51) are fixed in pairs through the rubber tube (52); The number of the annular magnets (51), the blades (53) and the brackets (54) is even, and the rotation directions of two adjacent blades (53) are opposite.

2. An axial expansion joint according to claim 1, characterized in that: The axial expansion and contraction device (5) is connected to the vertical pipe (1) by means of a flange.

3. An axial expansion joint according to claim 1, characterized in that: The transverse tube (2) and the two vertical tubes (1) are all made of stainless steel.

4. An axial expansion joint according to claim 1, characterized in that: The rubber tube (52) is made of EPDM.

5. An axial expansion joint according to claim 1, characterized in that: The axial expansion joint further comprises: a support frame (6), the support frame (6) being located between the two vertical tubes (1); a connecting frame (7), the connecting frame (7) comprising: a connecting ring (71), a connecting rod (72) and a connecting sleeve (73), the connecting ring (71) and the connecting sleeve (73) being fixedly connected via the connecting rod (72); the connecting ring (71) being fixedly connected to the outer ring of the annular magnet (51) at the end of the axial telescopic device (5) at one end of the air inlet (3), and the connecting sleeve (73) being fixedly connected to the outer wall of the vertical tube (1) at one end of the air outlet (4).

6. An axial expansion joint according to claim 5, characterized in that: The connecting rod (72) is installed horizontally.

7. An axial expansion joint according to claim 5, characterized in that: The connecting frame (7) further comprises a sliding rod (74), the number of the sliding rods (74) being greater than one, the sliding rods (74) being arranged horizontally and parallel to each other, one end of the sliding rod (74) being fixedly connected to the connecting rod (72), and the other end being located in a sliding groove (61) on the upper surface of the supporting frame (6) and cooperating with the sliding rod (74).

8. An axial expansion joint according to claim 7, characterized in that: The slide bar (74) is made of die steel.

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