A connecting structure of stainless steel pipe fittings

Abstract

This invention relates to the technical field, and particularly to a connection structure for stainless steel pipe fittings, comprising: a first pipe and a second pipe; an embedded connector, wherein the embedded connector has a spacer flush with the surfaces of the first and second pipes in the middle, and an inset ring connected to both sides of the spacer, the inset ring fitting to the first pipe, and an insert fixedly connected to one side of the inset ring. The embedded connector is formed directly into a groove by stamping, requiring no additional processing steps. Furthermore, the insert, inset ring, and fitting ring are integrally formed, reducing welding steps and avoiding insufficient connector strength due to welding defects, thus reducing processing costs while improving production efficiency. The filler is installed by adhesive bonding, which is simple to process, can be produced separately, and can be flexibly bonded. In case of abnormalities, it can be removed and re-bonded, further improving processing convenience and adapting to the connection needs of stainless steel pipes of different diameters, balancing processing practicality and economy.

Description

Technical Field

[0001] This invention relates to the field of technology, and in particular to a connection structure for stainless steel pipe fittings. Background Technology

[0002] Stainless steel pipe fittings, with their excellent properties such as corrosion resistance, high strength, long service life, and hygiene and environmental friendliness, are widely used in various fields such as building water supply, industrial pipelines, municipal engineering, food and medicine, becoming one of the core components of various fluid transportation systems. The reliability, sealing performance, and ease of installation of the connections between pipe fittings directly determine the operational stability, safety, and service life of the entire pipeline system. Therefore, the design and optimization of stainless steel pipe fitting connection structures has always been a key research focus and technical challenge in the industry.

[0003] Currently, the main connection methods for existing stainless steel pipe fittings include welding, press-fit, ring press, socket press-fit, and threaded connection. However, all of these connection methods have significant technical defects and cannot simultaneously meet the comprehensive requirements of pipeline systems for connection strength, sealing performance, ease of construction, and ease of maintenance.

[0004] Welding, as a traditional and widely used connection method, can guarantee a certain connection strength, but it has many shortcomings: on-site welding operations require a high level of professional skills from construction personnel, the welding quality is unstable, and defects such as incomplete penetration, false welding, porosity, and slag inclusion are prone to occur, leading to sealing failure at the joint, reduced corrosion resistance, and cracking and leakage problems due to corrosion or vibration after long-term use; at the same time, excessively high temperatures during welding can easily cause intergranular corrosion of stainless steel, damaging the structural properties of the material itself, and post-weld slag cleaning and other follow-up treatments are required, making the construction process cumbersome, inefficient, and costly, especially unsuitable for connecting thin-walled stainless steel pipes.

[0005] While mechanical connection methods such as crimping and ring crimping solve the problem of cumbersome welding construction and achieve sealing through sealing rings, making installation convenient, the connection strength is relatively low, only reaching about one-third of the pipe body strength. Moreover, the sealing ring is easily damaged by factors such as burrs at the pipe ends and installation deviations, and there is a risk of aging and detachment after long-term use, leading to seal failure. Especially in high-pressure pipeline systems, its pressure-bearing capacity is limited and cannot meet the high reliability requirements. In addition, ring crimping connections also have the problem of easy pipe rotation, affecting the sealing effect, while crimping connections cannot be disassembled, making later maintenance difficult.

[0006] While socket-type crimp connections offer improvements in tensile strength and sealing performance, and utilize anaerobic adhesive as the sealing material, they suffer from drawbacks such as sealant overflow clogging pipes, failure to solidify upon contact with an oxygen-rich environment leading to loss of sealing performance. Furthermore, the core sleeve only provides support and lacks an independent sealing structure, leaving room for improvement in pressure resistance. Traditional threaded connections, on the other hand, present challenges such as cumbersome installation, high leakage rates, and the potential for sealing materials to contaminate water quality. They are particularly unsuitable for thin-walled stainless steel pipe fittings, and the difficulty in ensuring on-site machining accuracy further reduces connection reliability.

[0007] Furthermore, most existing stainless steel pipe fittings use multi-part welding for their connectors, which involves cumbersome processing steps. This not only increases processing costs but also makes the connectors themselves prone to insufficient strength due to welding defects, affecting the overall connection effect. At the same time, existing connection structures are prone to problems such as misalignment and incomplete welding during the butt joint process, further reducing the sealing and stability of the connection. Moreover, when welding damage or leakage occurs at the connection, traditional repair methods such as secondary welding or adding metal sheet welding are ineffective, have short service life, and cannot achieve convenient and long-term repair. Summary of the Invention

[0008] The purpose of this invention is to provide a connection structure for stainless steel pipe fittings. This stainless steel pipe fitting connection structure is easy to process, efficient to install, has high connection strength and reliable sealing, can reduce processing and construction costs, can avoid existing connection defects, and is convenient to maintain and has a long-lasting repair effect.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a connection structure for stainless steel pipe fittings, comprising: Pipeline 1 and Pipeline 2; An embedded connector has a spacer in the middle that is flush with the surfaces of tube one and tube two, and an inlet embedding ring connected to both sides of the spacer. The inlet embedding ring fits into tube one. An insert is fixedly connected to one side of the inlet embedding ring. An annular gap is reserved between the insert and the inner wall of tube one. A sealing element is fixedly connected to one side of the insert. A filler sleeve that fills the annular gap and has a plurality of fillers embedded in grooves provided on the embedded connector.

[0010] Furthermore, the insert, the inlet embedding ring, and the fitting ring are integrally formed, and the surface of the insert is stamped with grooves that are recessed toward the axis at intervals.

[0011] Embedded connectors are formed directly into grooves by stamping, which is simple, convenient, and has lower processing costs. The one-piece molding process simplifies the processing steps, reduces welding steps, and allows for direct forming, thus ensuring that embedded connectors are easy to produce.

[0012] Furthermore, the sealing element includes a fitting ring, the outer surface of which has an annular groove, and a rubber ring with a surface higher than the outer surface of the fitting ring is fitted inside the annular groove.

[0013] When using the sealing component, the presence of the rubber ring provides a damping effect when inserted into the inner walls of pipes one and two during the connection of pipes one and two. This serves two purposes: firstly, it seals the joint; secondly, after the connection is completed, the rubber ring ensures that the insulating component is in close contact with the circumference of pipe one or pipe two, regardless of its placement. This prevents seam differences and incomplete welding during external welding, and also improves the sealing performance after welding.

[0014] Furthermore, the filling sleeve includes a metal film sleeve, the inner wall of which is adhered to the surface of the insert. The metal film sleeve has multiple strip grooves evenly spaced on it, and a filling element is fitted inside the strip groove. The length of the filling element is greater than the length of the strip groove, and the bottom of the filling element is adhered to the bottom of the inner wall of the groove.

[0015] The filler sleeve is a filler component that fills the reserved annular gap. The filler sleeve can be annular and directly fixed to the groove by welding. During the welding process, it is ensured that each filler component is stably placed in the groove. Alternatively, a strip design can be used. When connecting pipe one and pipe two, the long strip filler sleeve is installed around the groove. After completing one turn, it is cut according to the length and then the end is welded to form the filler layer. This design can be arbitrarily selected according to the stainless steel pipes of different diameters during welding, making the operation more convenient.

[0016] It should also be noted that the advantage of using adhesive to attach the filler to the groove is that it reduces the number of processing steps. After punching the metal film sleeve, the filler is produced separately and can be directly pasted. Moreover, if any abnormality occurs during the connection, the filler can be removed and a new one can be pasted, making it more convenient to use.

[0017] Furthermore, the filler includes a metal sleeve, and an aluminum bubble is fixedly connected to the bottom of the inner wall of the metal sleeve, the aluminum bubble having an expansion cavity.

[0018] Furthermore, an expansion member is fixedly connected to the top of the aluminum bubble, and a solder strip is attached to the top of the expansion member.

[0019] Furthermore, the filler also includes a cover, which is fixedly connected to the open portion of the metal sleeve.

[0020] Furthermore, the cover includes a vulnerable membrane that covers and seals the top of the metal sleeve, and rigid plates fixed to both sides of the vulnerable membrane along its length.

[0021] When the filler is installed, after tube one and tube two are welded to the embedded connector, the weld joint may be damaged or broken during use, and water leakage may occur at the joint. The common method is to use secondary welding or to add a metal sheet to the damaged area for welding. However, this method has a short service life. After welding the joint of tube one and tube two to the embedded connector, the filler is heated with a spray gun. When heated, the filler can form solder liquid and fill the annular gap. In this way, the insert and tube one or tube two can have a large area of ​​solder surface, which improves the connection strength between the stainless steel tubes.

[0022] When heating the surface of tube one or tube two corresponding to the filler position, the surface of the rigid plate will melt when heated. Under the action of heating, the solder bar melts and gradually overflows into the annular gap. As the heating area increases, the annular gap is filled with solder liquid. After cooling, a tight connection layer is formed, which not only increases the overall strength of the weak weld, but also improves the service life. Of course, after the initial welding, the position of the filler can be left unheated. If leakage occurs later, the inside can be dried before the position of the filler is heated. The solder bar can also be filled into the annular gap.

[0023] Of course, the vulnerable film can be made of perforated aluminum foil to reduce impurities during subsequent hot melting; The expansion component is designed so that during heating, the heat generated by the melting of the solder bar is transferred to the expansion component. This allows the paraffin wax inside the air chamber to be heated first, and the melted paraffin wax can be used to keep the expansion component warm, ensuring a uniform temperature. In addition, it can control the temperature and prevent the expansion component from overheating, which could cause leakage of thermal expansion gas. Because the reserved expansion part will generate gas expansion during heating, it ensures that the expansion component can increase in volume after heating. Combined with the increased gas pressure inside the aluminum bubble, this helps the solder bar to quickly overflow from the metal sleeve.

[0024] Furthermore, the rigid plate is adhered to the surface of the metal film sleeve, and both the outer surfaces of the metal film sleeve and the filler are coated with lubricating oil.

[0025] This makes it easier to attach tube one and tube two to the metal membrane sleeve.

[0026] Furthermore, when the first tube and the second tube are fitted onto the metal film sleeve, the ends of the first tube and the second tube need to be heated by water bath or steam.

[0027] During installation, the principle of thermal expansion increases the gap between the tube and the filler sleeve, making insertion easier and resulting in a better seal after cooling.

[0028] The technical effects and advantages of this invention are as follows: 1. This stainless steel pipe fitting connection structure is easy to process and has a low cost, effectively solving the problems of existing connectors that involve multiple parts welding and cumbersome processing steps. The embedded connector directly forms the groove through stamping, eliminating the need for additional processing steps. Furthermore, the insert, the inset ring, and the fitting ring are integrally formed, reducing welding steps and avoiding insufficient connector strength due to welding defects. This lowers processing costs while improving production efficiency. The filler is installed using an adhesive method, which is simple to process, can be produced separately, and can be flexibly attached. In case of abnormalities, it can be removed and reattached, further improving processing convenience. It adapts to the connection needs of stainless steel pipes of different diameters, balancing practicality and economy.

[0029] 2. This structure boasts high connection strength and reliable sealing performance, effectively avoiding the defects of existing connection methods such as sealing failure and weak connections. The rubber ring in the seal has a damping effect, ensuring that the isolator fits tightly against the circumference of the pipe during mating, preventing misalignment and incomplete welding during welding, and further improving the sealing performance after welding. The filler, when heated, forms molten solder that fills the annular gap, creating a large solder joint surface between the insert and the pipe, significantly increasing the connection strength. Simultaneously, the application of lubricating oil and the heating treatment of the pipe ends facilitate installation and provide an even better sealing effect after cooling, effectively preventing leaks and corrosion during pipeline operation and ensuring the long-term stable operation of the pipeline system.

[0030] 3. This structure offers efficient installation and convenient maintenance, balancing construction convenience with long-term safety. During installation, the pipe fitting ends are heated via water bath or steam, utilizing thermal expansion to increase the installation gap, facilitating connection, reducing construction difficulty, and improving efficiency. No highly skilled professional installers are required, making it suitable for various construction scenarios. In case of welding damage or leakage at the connection points, there is no need for inefficient repair methods such as traditional secondary welding or adding metal plates. Simply heating the filler area allows the solder to fill the gap, completing the repair. This convenient and long-lasting repair significantly reduces maintenance costs, extends the overall service life of the pipeline, and meets the high reliability requirements of various pipeline systems. Attached Figure Description

[0031] Figure 1 This is a perspective view of the present invention; Figure 2 This is a partial cross-sectional view of the present invention; Figure 3 This is a partial cross-sectional view of the embedded connector in this invention; Figure 4 This is a schematic diagram of the embedded connector in the present invention; Figure 5 This is a front view of the embedded connector in this invention; Figure 6 This is a cross-sectional view of the filler in this invention; Figure 7 This is a partially enlarged view of the cross-sectional view of the filler in this invention.

[0032] In the picture: 1. Tube 1; 2. Tube 2; 3. Embedded connector; 31. Isolator; 32. Inset ring; 33. Insert; 34. Groove; 35. Fitting ring; 36. Annular groove; 37. Rubber ring; 4. Filler sleeve; 41. Metal film sleeve; 42. Strip groove; 43. Filler; 431. Metal sleeve; 432. Cover; 4321. Vulnerable film; 4322. Rigid board; 433. Bubble aluminum; 434. Expansion part; 4341. Aluminum film; 4342. Heat-resistant sponge; 4343. Air bladder cavity; 4344. Paraffin wax; 4345. Reserved expansion part; 435. Solder bar. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Reference Figure 1 - Figure 5 The present invention provides a connection structure for a stainless steel pipe fitting, comprising: Pipe 1 and pipe 2; embedded connector 3, the embedded connector 3 has a partition 31 in the middle that is flush with the surface of pipe 1 and pipe 2, and an inlet embedding ring 32 connected to both sides of the partition 31. The inlet embedding ring 32 fits into pipe 1. An insert 33 is fixedly connected to one side of the inlet embedding ring 32. An annular gap is reserved between the insert 33 and the inner wall of pipe 1. A sealing element is fixedly connected to one side of the insert 33. The filler sleeve 4 fills the annular gap and has a plurality of filler elements 43 embedded in the grooves 34 provided on the embedded connector 3.

[0035] The insert 33, the inset ring 32, and the fitting ring 35 are integrally formed. The surface of the insert 33 is stamped with recesses 34 at intervals towards the axis. The recesses 34 are formed directly by stamping the embedded connector 3, which is simple, convenient, and has lower processing costs. The advantages of integral forming are that the processing steps are simple, the welding steps are reduced, and it can be formed directly, thus ensuring that the embedded connector 3 is easy to produce.

[0036] The sealing element includes a fitting ring 35, with an annular groove 36 formed on the outer surface of the fitting ring 35. A rubber ring 37, with its surface protruding above the outer surface of the fitting ring 35, is fitted inside the annular groove 36. When the sealing element is in use, the presence of the rubber ring 37 provides a damping effect when inserted into the inner walls of pipes 1 and 2, thus sealing the joint. Furthermore, after the connection is completed, the rubber ring 37 ensures that the isolating element 31 is tightly fitted to the circumference of either pipe 1 or pipe 2, preventing seam differences and incomplete welds during external welding. This also improves the sealing performance after welding.

[0037] The filler sleeve 4 includes a metal film sleeve 41. The inner wall of the metal film sleeve 41 is attached to the surface of the insert 33. Multiple strip grooves 42 are evenly spaced on the metal film sleeve 41. A filler 43 is fitted inside the strip grooves 42. The length of the filler 43 is greater than the length of the strip grooves 42, and the bottom of the filler 43 is attached to the bottom of the inner wall of the groove 34.

[0038] The filler sleeve 4 is a filler that fills the reserved annular gap. The filler sleeve 4 can be annular and can be directly fixed to the groove 34 by welding. During the welding process, it is ensured that each filler 43 is stably placed in the groove 34. Alternatively, a strip design can be adopted. When connecting pipe 1 and pipe 2, the long strip filler sleeve 4 is installed around the groove 34. After completing one circle, it is cut according to the length and then the end is welded to form the filling layer. This design can be arbitrarily selected according to the stainless steel pipes of different diameters during welding, making the operation more convenient.

[0039] It should also be noted that the advantage of using the method of pasting the filler 43 into the strip groove 42 is that it reduces the number of processing steps. After punching the metal film sleeve 41, the filler 43 can be produced separately and pasted directly. Moreover, if any abnormality occurs during the connection, the filler 43 can be removed and re-pasted, making it more convenient to use.

[0040] The filler 43 includes a metal sleeve 431, with a bubble aluminum 433 fixedly connected to the bottom of the inner wall of the metal sleeve 431. The bubble aluminum 433 has an expansion cavity. An expansion member 434 is fixedly connected to the top of the bubble aluminum 433, and a solder strip 435 is attached to the top of the expansion member 434. The filler 43 also includes a cover 432, which is fixedly connected to the open position of the metal sleeve 431. The cover 432 includes a vulnerable membrane 4321 that covers and seals the top of the metal sleeve 431, and rigid plates 4322 fixed to both sides of the vulnerable membrane 4321 along its length.

[0041] The filler 43 is designed so that after tube 1 and tube 2 are welded to the embedded connector 3, the weld joint may be damaged or broken during use, and water leakage may occur at the joint. The common method is to use secondary welding or to add a metal sheet to the damaged area for welding. However, this method does not last long. After welding the joint of tube 1 and tube 2 to the embedded connector 3, the filler 43 is heated with a spray gun. When heated, the filler 43 can form solder liquid and fill the annular gap. In this way, the insert 33 and tube 1 or tube 2 can have a large area of ​​solder surface, which improves the connection strength between the stainless steel tubes.

[0042] When heating the surface of tube 1 or tube 2 at the position corresponding to the filler 43, the surface of the rigid plate 4322 will melt when heated. Under the action of heating, the solder bar 435 melts and gradually overflows into the annular gap. As the heating area increases, the annular gap is filled with solder liquid. After cooling, a tight connection layer is formed, which not only increases the overall strength of the weak weld but also improves the service life. Of course, after the initial welding, the position of the filler 43 can be left unheated. If leakage occurs later, the inside can be dried before the position of the filler 43 is heated. The solder bar 435 can also be filled into the annular gap.

[0043] Of course, the vulnerable film 4321 can be a perforated aluminum foil to reduce impurities during subsequent hot melting; The expansion element 434 is designed so that during heating, the solder bar 435 melts and the heat is transferred to the expansion element 434. In this way, the paraffin wax 4344 in the air chamber 4343 is heated first. The melted paraffin wax 4344 can be kept warm, so that the temperature of the expansion element 434 is uniform. In addition, the temperature can be controlled to avoid the problem of thermal expansion gas leakage caused by the expansion element 434 being too hot. Since the reserved expansion part 4345 will generate gas expansion inside during heating, it ensures that the expansion element 434 can increase in volume after heating. Combined with the increase in gas pressure inside the aluminum bubble 433, it helps the solder bar 435 to quickly overflow from the metal sleeve 431.

[0044] A rigid plate 4322 is adhered to the surface of the metal film sleeve 41, and both the outer surfaces of the metal film sleeve 41 and the filler 43 are coated with lubricating oil. This facilitates the fitting of tube 1 and tube 2 onto the metal film sleeve 41. When tube 1 and tube 2 are fitted onto the metal film sleeve 41, the ends of tube 1 and tube 2 need to be heated by water bath or steam.

[0045] During installation, the principle of thermal expansion increases the gap between tube 1 and filler sleeve 4, making insertion easier and resulting in a better seal after cooling.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A connection structure for stainless steel pipe fittings, characterized in that, include: Pipe 1 (1) and Pipe 2 (2); An embedded connector (3) has a partition (31) in the middle that is flush with the surface of the first tube (1) and the second tube (2), and an inlet embedding ring (32) connected to both sides of the partition (31). The inlet embedding ring (32) fits against the first tube (1). An insert (33) is fixedly connected to one side of the inlet embedding ring (32). An annular gap is reserved between the insert (33) and the inner wall of the first tube (1). A sealing element is fixedly connected to one side of the insert (33). A filler sleeve (4) fills the annular gap and has a plurality of fillers (43) embedded in grooves (34) provided on the embedded connector (3).

2. The connection structure of a stainless steel pipe fitting according to claim 1, characterized in that, The insert (33), the inlet embedding ring (32) and the fitting ring (35) are integrally formed. The surface of the insert (33) is stamped with grooves (34) that are recessed towards the axis. The grooves (34) are formed directly by stamping the embedded connector (3), which is simple and convenient, and the processing cost is lower. The advantages of integral forming are that the processing steps are simple, the welding steps are reduced, and it can be formed directly, thus ensuring that the embedded connector (3) is easy to produce.

3. The connection structure of a stainless steel pipe fitting according to claim 2, characterized in that, The sealing element includes a fitting ring (35), and an annular groove (36) is provided on the outer surface of the fitting ring (35). A rubber ring (37) with a surface higher than the outer surface of the fitting ring (35) is fitted inside the annular groove (36).

4. The connection structure of a stainless steel pipe fitting according to claim 3, characterized in that, The filling sleeve (4) includes a metal film sleeve (41), the inner wall of the metal film sleeve (41) is pasted to the surface of the insert (33), a plurality of strip grooves (42) are provided at equal intervals on the metal film sleeve (41), and a filling element (43) is sleeved inside the strip groove (42). The length of the filling element (43) is greater than the length of the strip groove (42), and the bottom of the filling element (43) is pasted to the bottom of the inner wall of the groove (34).

5. The connection structure of a stainless steel pipe fitting according to claim 4, characterized in that, The filler (43) includes a metal sleeve (431), and a bubble aluminum (433) is fixedly connected to the bottom of the inner wall of the metal sleeve (431). The bubble aluminum (433) has an expansion cavity.

6. The connection structure of a stainless steel pipe fitting according to claim 5, characterized in that, An expansion member (434) is fixedly connected to the top of the aluminum bubble (433), and a solder strip (435) is pasted on the top of the expansion member (434).

7. The connection structure of a stainless steel pipe fitting according to claim 4, characterized in that, The filler (43) also includes a cover (432), which is fixedly connected to the opening of the metal sleeve (431).

8. The connection structure of a stainless steel pipe fitting according to claim 3, characterized in that, The cover (432) includes a vulnerable membrane (4321) that covers and seals the top of the metal sleeve (431), and rigid plates (4322) fixed on both sides of the vulnerable membrane (4321) along its length.

9. The connection structure of a stainless steel pipe fitting according to claim 5, characterized in that, The rigid plate (4322) is attached to the surface of the metal film sleeve (41), and both the outer surfaces of the metal film sleeve (41) and the filler (43) are coated with lubricating oil.

10. The connection structure of a stainless steel pipe fitting according to claim 9, characterized in that, When the tube one (1) and the tube two (2) are fitted onto the metal film sleeve (41), the ends of the tube one (1) and the tube two (2) need to be heated by water bath or steam.

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