A compensator made by adding glue and pressing

Abstract

A compensator made of glue and pressed together includes an outer sleeve, an inner conduit and an elastic telescopic tube, and is also provided with a first ring piece and a second ring piece. The first ring piece, one end of the elastic telescopic tube and the outer sleeve form a three-layer structure, and the second ring piece, the other end of the elastic telescopic tube and the inner conduit form a three-layer structure. Both ends of the elastic telescopic tube are provided with anaerobic adhesive layers inside and outside, and the three-layer structure is configured to be fixed by pressing together. It adopts the pressing together method to realize the fixed installation of both ends of the elastic telescopic tube, avoid welding defects, avoid heat treatment of the elastic telescopic tube, thereby ensuring the service life of the elastic telescopic tube, and pressing together is simpler than welding, convenient for processing, and avoids the problem that the elastic telescopic tube is thin and easy to weld through, and the corrugated tube is separately processed from the outer sleeve and the inner conduit before pressing together, which improves the defect of the original welding error leading to overall scrapping, improves the yield rate, and reduces costs.

Description

Technical Field

[0001] The invention relates to the technical field of gas pipelines, and in particular to a compensator made by adding glue and pressing. Background Art

[0002] Gas transmission usually uses stainless steel pipelines. In order to prevent the pipeline from thermal expansion due to temperature changes or deformation or damage caused by temperature stress, it is often necessary to install compensators on the pipeline to compensate for the thermal expansion of the pipeline and reduce the stress on the pipe wall. At present, most compensators have the disadvantages of small compensation amount and short service life.

[0003] CN210319013U discloses a gas pipeline compensator, including an outer sleeve, an inner conduit and an elastic telescopic tube, which achieves the effect of compensating for thermal expansion and contraction through the cooperation of the three tubes, wherein one end of the elastic telescopic tube is welded to the end of the outer sleeve and the other end is welded to the wall of the inner conduit, and the elastic telescopic tube adopts a metal bellows. Due to the unique wave-like design of the metal bellows, a certain compressibility or stretchability is maintained by relying on the elastic deformation of the corrugated side wall. In the existing situation, the welding method is generally accompanied by corresponding heat treatment, and the heat treatment of the welding point will have an adverse effect on the telescopic properties of the bellows, that is, its service life. Summary of the invention

[0004] The purpose of the present invention includes providing a compensator made of glue and pressed together, which adopts pressing to realize the fixed installation of the two ends of the elastic telescopic tube, avoids welding defects, avoids heat treatment of the elastic telescopic tube, thereby ensuring the service life of the elastic telescopic tube, and pressing is simpler than welding, convenient for processing, and avoids the problem that the elastic telescopic tube is thin and easy to be welded through, and the corrugated tube is separately processed from the outer sleeve and the inner conduit and then pressed together, thereby improving the defect that the original welding error will lead to the overall scrapping, improving the yield rate and reducing costs.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A compensator made of glue and pressed together comprises an outer sleeve, an inner guide tube and an elastic telescopic tube. One end of the inner guide tube extends into the outer sleeve, the outer sleeve is sleeved on one end of the inner guide tube, the inner guide tube and the outer sleeve are slidably matched and connected through the elastic telescopic tube, the elastic telescopic tube is sleeved on the other end of the inner guide tube, the two ends of the elastic telescopic tube are respectively fixedly connected to the outer sleeve and the inner guide tube, and a first ring piece and a second ring piece are also provided. The first ring piece, one end of the elastic telescopic tube and the outer sleeve form a three-layer structure, and the second ring piece, the other end of the elastic telescopic tube and the inner guide tube form a three-layer structure. Anaerobic glue layers are provided on the inner and outer sides of both ends of the elastic telescopic tube, and the three-layer structure is configured to be fixed by pressing together.

[0007] Furthermore, the three-layer structure is provided with at least three compression rings in sequence along the axial direction of the outer sleeve, wherein a compression ring is provided at both ends of the three-layer structure.

[0008] Furthermore, the first ring piece and the second ring piece are both made of metal material.

[0009] Furthermore, the elastic telescopic tube includes a metal bellows.

[0010] Furthermore, an arc portion is provided at one end of the first ring sheet close to the corrugated section of the metal bellows and at one end of the second ring sheet close to the corrugated section of the metal bellows, and the arc portion is closely connected to the trough arc portion of the corrugated section.

[0011] Furthermore, both ends of the glue-pressed compensator are connected to the gas pipe through clamps.

[0012] Furthermore, a protective sleeve is provided, which is arranged around the elastic telescopic tube, one end of the protective sleeve is fixedly connected to the inner catheter, and the other end of the protective sleeve is arranged at a relative interval to the outer sleeve.

[0013] Furthermore, the protective cover is made of stainless steel or plastic.

[0014] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0015] 1. It adopts the pressing method to realize the fixed installation of both ends of the elastic telescopic tube, avoiding welding defects and heat treatment of the elastic telescopic tube, thereby ensuring the service life of the elastic telescopic tube;

[0016] 2. Pressing is simpler than welding, and is convenient for processing, avoiding the problem of thin elastic expansion tubes being easily welded through;

[0017] 3. The bellows is processed separately from the outer sleeve and the inner conduit and then pressed together to improve the defect of the original welding error leading to overall scrapping, improve the yield rate, reduce the scrap rate of the bellows, and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 An overall structural schematic diagram of a compensator made of glue and pressed is provided for an embodiment of the present invention;

[0020] Figure 2 A cross-sectional view of a compensator made by glue pressing is provided for an embodiment of the present invention;

[0021] Figure 3A schematic diagram of a three-layer structure is provided for an embodiment of the present invention.

[0022] Icons: 100 - outer sleeve, 200 - inner catheter, 300 - elastic telescopic tube, 400 - first ring piece, 410 - arc-shaped portion, 500 - second ring piece, 600 - compression ring line, 700 - protective sleeve. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present invention, it should be noted that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Please refer to Figures 1 to 3 A compensator made of glue and pressed together includes an outer sleeve 100, an inner guide tube 200 and an elastic telescopic tube 300. One end of the inner guide tube 200 extends into the outer sleeve 100. The outer sleeve 100 is sleeved on one end of the inner guide tube 200. The inner guide tube 200 and the outer sleeve 100 are slidably matched and connected through the elastic telescopic tube 300. The elastic telescopic tube 300 is sleeved on the other end of the inner guide tube 200. Both ends of the elastic telescopic tube 300 are fixedly connected to the outer sleeve 100 and the inner guide tube 200 respectively. The glue-added pressed compensator is also provided with a first ring piece 400 and a second ring piece 500, both of which are made of metal materials, the first ring piece 400, one end of the elastic telescopic tube 300 and the outer tube 100 form a three-layer structure, the second ring piece 500, the other end of the elastic telescopic tube 300 and the inner conduit 200 form a three-layer structure, both ends of the elastic telescopic tube 300 are provided with anaerobic glue layers inside and outside, and the three-layer structure is configured to be fixed by pressing. The elastic telescopic tube 300 can be a metal bellows.

[0029] The inventor found that in the prior art, the elastic telescopic tube 300 is connected to the outer sleeve 100 and the inner conduit 200 by welding. The elastic telescopic tube 300 has elastic properties that can be stretched and compressed, and is used in gas pipelines to compensate for the thermal expansion and contraction of gas pipelines. Compared with the general method of connecting one tube + corrugated tube + another tube in sequence, the above-mentioned outer sleeve 100 + inner conduit 200 + elastic telescopic tube 300 is simple in structure and easy to process, and the compensation amount is greater than the former. However, due to the elastic setting of the metal bellows, its wall must be thin-walled, and is much smaller than the wall thickness of the outer sleeve 100 and the inner conduit 200. Therefore, during the welding process, there are not only problems such as welding penetration, welding leakage, and uneven circumferential welding, but also the defect that the welding accompanied by heat treatment will affect the actual service life of the metal bellows, affecting the long-term compensation operation of the gas pipeline.

[0030] Therefore, the inventor invented a compensator made of glue and pressed together. By adding a first ring piece 400 and a second ring piece 500, the compensator assists in realizing the pressed connection between the elastic telescopic tube 300 and the outer tube 100, and between the elastic telescopic tube 300 and the inner tube 200, respectively, avoiding welding, thereby avoiding welding defects; the compensator adopts the pressing method to realize the fixed installation of both ends of the elastic telescopic tube 300, avoiding welding defects, avoiding heat treatment of the elastic telescopic tube 300, thereby ensuring the service life of the elastic telescopic tube 300; and pressing is simpler than welding, convenient for processing, and avoids the problem that the elastic telescopic tube 300 is thin and easy to be welded through.

[0031] Since the economic value of the metal bellows is greater than the value of the outer tube 100, the inner tube 200 and other pipes, if there is a mistake in the welding method, the outer tube 100, the inner tube 200 and the metal bellows will all be scrapped. The above-mentioned glue-added press-fit compensator is used to separate the bellows from the outer tube 100 and the inner tube 200 and then press them together. Compared with welding, it can improve the yield rate and improve the defect that the original welding error will result in the entirety being scrapped, thereby reducing the scrap rate of the metal bellows and reducing the overall cost.

[0032] For further information, please refer to Figure 3 The three-layer structure is provided with at least three compression rings 600 in sequence along the axial direction of the outer sleeve 100, wherein a compression ring 600 is provided at both ends of the three-layer structure. Figure 3 The figure shows a three-layer structure of an outer sleeve 100, one end of a metal threaded tube, and a first ring piece 400, wherein four pressing ring lines 600 are provided in sequence, and pressing is performed at the pressing ring lines 600, and a hydraulic mechanism can be used for ring pressing. In this embodiment, the first ring piece 400 and the second ring piece 500 adopt an annular structure instead of a planar structure, which reduces the requirements for pressing machinery and equipment.

[0033] For further information, please refer to Figure 3 The first ring piece 400 and the second ring piece 500 are both provided with an arc portion 410 at one end of the corrugated section of the metal bellows and at one end of the corrugated section of the metal bellows. The arc portion 410 is closely connected with the trough arc portion of the corrugated section.

[0034] When the arc portion 410 is not provided, when the metal bellows undergoes elastic deformation and compensates for the thermal expansion and contraction of the gas pipeline, the corrugated section of the metal bellows deforms, and the deformation pressure is transmitted to one end of the bellows, specifically the position where the flat end is connected to the ring piece, the outer sleeve 100 or the inner conduit 200, wherein the stress at the ring piece close to one end of the bellows is the greatest. If the metal bellows fails, it often breaks at the point where the stress is the greatest.

[0035] In the technical solution of this embodiment, by adding an arc portion 410, after the compensator is installed as a whole, the arc surface of the arc portion 410 is in close contact with the troughs on both sides of the corrugated section of the metal bellows. Combined with the deformation action of the bellows and the deformation action of the bending portion while the straight portion remains unchanged, the addition of the arc portion 410 is beneficial to increasing the stress-bearing area at the original maximum stress point, thereby reducing the maximum pressure, protecting the long-term compensation operation of the bellows, and increasing the service life of the metal bellows.

[0036] Furthermore, the two ends of the glue-pressed compensator are connected to the gas pipe through clamps, replacing the commonly used flange connection method in the prior art. The clamps facilitate the connection and disassembly of the compensator and the gas pipe, and facilitate the subsequent replacement and maintenance. The clamps are in the form of clamps in the segmented exhaust pipe interface connection device disclosed in CN204457976U, etc.

[0037] Furthermore, the glue-added pressed compensator is also provided with a protective sleeve 700, which is arranged around the elastic telescopic tube 300, one end of the protective sleeve 700 is fixedly connected to the inner conduit 200, and the other end is arranged relatively spaced from the outer sleeve 100, and the protective sleeve 700 is made of stainless steel or plastic material. The protective sleeve 700 ensures the running ring of the metal bellows and the service life of the bellows.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compensator made of glue and pressed together, comprising an outer sleeve, an inner conduit and an elastic telescopic tube, wherein one end of the inner conduit extends into the outer sleeve, the outer sleeve is sleeved on one end of the inner conduit, the inner conduit and the outer sleeve are slidably matched and connected through an elastic telescopic tube, the elastic telescopic tube is sleeved on the other end of the inner conduit, and the two ends of the elastic telescopic tube are respectively fixedly connected to the outer sleeve and the inner conduit, characterized in that: A first ring piece and a second ring piece are also provided, wherein the first ring piece, one end of the elastic telescopic tube and the outer tube form a three-layer structure, and the second ring piece, the other end of the elastic telescopic tube and the inner tube form a three-layer structure, and both ends of the elastic telescopic tube are provided with anaerobic adhesive layers on the inner and outer sides, and the three-layer structure is configured to be fixed by pressing; The three-layer structure is provided with at least three pressing rings in sequence along the axial direction of the outer sleeve, wherein a pressing ring is provided at each end of the three-layer structure; The elastic telescopic tube comprises a metal bellows; An end of the first ring piece close to the corrugated section of the metal bellows and an end of the second ring piece close to the corrugated section of the metal bellows are both provided with an arc portion, and the arc portion is closely connected to the trough arc portion of the corrugated section.

2. The compensator made of glue and pressed according to claim 1 is characterized in that: The first ring piece and the second ring piece are both made of metal material.

3. The compensator made of glue and pressed according to claim 1 is characterized in that: The two ends of the glue-added pressed compensator are connected to the gas pipe through clamps.

4. The compensator made of glue and pressed according to claim 1 is characterized in that: A protective sleeve is also provided, which is arranged around the elastic telescopic tube. One end of the protective sleeve is fixedly connected to the inner conduit, and the other end is arranged relatively spaced from the outer sleeve.

5. The compensator made of glue and pressed according to claim 4 is characterized in that: The protective cover is made of stainless steel or plastic.

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