A welding auxiliary device for stainless steel fin tubes

Abstract

The invention relates to the technical field of finned tubes, in particular to a welding auxiliary device for stainless steel finned tubes. When in use, one end of a tube is fixed on the auxiliary device, and the fin is sleeved into the tube by a sleeve manufacturing process. A gap is left between the fin and the tube after the operation is completed. The fin and the tube are fixed by a vacuum brazing process. Vacuum brazing requires that the solder is melted and then filled into the gap between the fin and the tube by the surface tension of the liquid. In this process, the contact surface between the tube and the fin can be approximated as a filling flow process of a fluid in a parallel plate under the action of surface tension. The invention adopts 304 stainless steel finned tubes to replace traditional carbon steel finned tubes, so that the heat exchange tube has good corrosion resistance inside and outside at the same time. The vacuum brazing technology is used to replace traditional welding or mechanical connection technology to produce finned tubes, thereby improving the production efficiency and connection quality of stainless steel finned tubes.

Description

Technical Field

[0001] The invention relates to the technical field of fin tubes, in particular to a welding auxiliary device for stainless steel fin tubes. Background Art

[0002] As the core heat exchange element of the heat exchanger, improving the heat transfer performance of the heat exchanger and controlling the volume and mass are of great significance to improving the efficiency of the heat exchanger and reducing the production cost. Since the convective heat transfer coefficient of the air side outside the tube is much lower than the convective heat transfer coefficient of the two-phase flow inside the tube, in the production of the heat exchanger tube, fins are added to the surface of the heat exchanger tube to increase the heat transfer area outside the heat exchanger tube to improve the heat transfer capacity of the heat exchanger tube. The finned heat exchanger tube not only increases the heat transfer area outside the tube, but also effectively enhances the airflow disturbance effect and improves the heat transfer performance by changing the shape of the fin surface. In addition, since the fins replace the heat transfer area of ​​the bare tube, the use of the heat exchanger tube can be effectively reduced, reducing the production cost of the heat exchanger. According to the production and manufacturing method of the finned tube, it can be mainly divided into integral finned tubes, electric welded finned tubes, high-frequency finned tube radiators and mechanically connected finned tube radiators. Fin tubes produced by traditional carbon steel hot-dip galvanizing technology use hot-dip galvanizing technology to give the outer surface of the fin tubes good corrosion resistance. However, the carbon steel inner wall on the water side of the fin tube is prone to corrosion due to direct contact with water and air, which reduces the service life of the heat exchange tube. At the same time, the overall hot-dip galvanizing layer on the surface of the heat exchange tube thickens the heat transfer resistance and reduces the heat transfer efficiency. Therefore, we choose stainless steel tubes for replacement.

[0003] There is a gap of a certain length and height on the contact surface between the stainless steel tube body and the fin. In order to eliminate the contact thermal resistance between the fin and the tube caused by the gap, we designed a welding method for stainless steel fin tubes.

[0004] When splicing the pipe fittings and fins, one end of the pipe fitting needs to be lifted first and the fins need to be put on the pipe fittings. Therefore, we design an auxiliary device to fix one end of the pipe fitting, so as to facilitate the initial fixation of the fins and subsequent welding work. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above or existing problems in the prior art in order to eliminate the contact thermal resistance between the fin and the tube caused by the gap, the present invention is proposed.

[0007] Therefore, an object of the present invention is to provide a welding auxiliary device for stainless steel fin tubes.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a welding auxiliary device for a stainless steel finned tube, wherein one end of the tube is fixed on the auxiliary device when in use, and the fin is inserted into the tube by a sleeve manufacturing process, and a gap will be left between the fin and the tube after the operation is completed, and the fin and the tube are fixed by a vacuum brazing process.

[0009] As a welding auxiliary device for the stainless steel fin tube of the present invention, vacuum brazing requires that the solder is melted and then filled into the gap between the fin and the tube by the surface tension of the liquid. In this process, the contact surface between the tube and the fin can be approximated as a filling flow process of the fluid in a parallel plate under the action of surface tension.

[0010] As a welding auxiliary device for stainless steel fin tubes of the present invention, when calculating the laminar flow of an incompressible steady-state non-Newtonian fluid, the Washburn equation is used to determine the interval of the gap between the fin and the tube filled by the molten welding liquid to avoid affecting the connection effect due to excessive interval.

[0011] The beneficial effects of the welding auxiliary device of the stainless steel fin tube of the present invention are as follows: the present invention adopts 304 stainless steel fin tubes to replace traditional carbon steel fin tubes, so that the inside and outside of the heat exchange tube have good corrosion resistance at the same time, and utilizes vacuum brazing technology to replace traditional welding or mechanical connection technology to produce the fin tube, thereby improving the production efficiency and connection quality of the stainless steel fin tube.

[0012] In order to solve the above technical problems, the present invention provides the following technical solutions: a welding auxiliary device for stainless steel finned tubes, comprising an auxiliary device. The auxiliary device comprises a accommodating mechanism, a driving mechanism arranged on the accommodating mechanism, and a fixing mechanism arranged on the driving mechanism. The accommodating mechanism comprises a base, a accommodating box arranged on the base, and a through hole and a clamping arc arranged on the accommodating box; the driving mechanism comprises a accommodating component arranged on the accommodating box, and a movable component arranged on the accommodating component; the fixing mechanism comprises a connecting component arranged on the movable component, and an outward expansion component arranged on the connecting component.

[0013] As a preferred solution of the welding auxiliary device of the stainless steel finned tube of the present invention, the accommodating assembly includes an oil storage tank arranged inside the accommodating box, hole bodies arranged on both sides of the oil storage tank, an isolation plate arranged at the center of the oil storage tank, a driven piston arranged inside the oil storage tank, and a first spring arranged on the driven piston.

[0014] As a preferred solution of the welding auxiliary device of the stainless steel finned tube of the present invention, the movable component includes a limit rod arranged on the driven piston, a lifting plate arranged on the limit rod, a limit frame arranged on the lifting plate, a side rod arranged on the limit frame, and a driving piston arranged at the bottom of the side rod, and the lifting plate is slidably connected to the limit frame.

[0015] As a preferred solution of the welding auxiliary device of the stainless steel finned tube of the present invention, wherein: the side rod and the limit rod are both slidably connected to the limit frame, the oil storage tank is slidably connected to the limit rod, an oil storage cavity is provided between the accommodating box and the oil storage tank, the driving piston is provided inside the oil storage cavity, and the driving piston is adapted to the oil storage cavity, and the outer wall of the driving piston is in contact with the inner wall of the accommodating box.

[0016] As a preferred solution of the welding auxiliary device of the stainless steel fin tube of the present invention, wherein: the connecting assembly includes an external part arranged inside the accommodating box, and an extrusion part arranged on the external part; the external part includes a movable block arranged on the side rod, a bottom cavity arranged at the bottom of the movable block, a second spring arranged in the bottom cavity, and a push plate arranged on the second spring; the extrusion part includes a through hole arranged on one side of the bottom cavity, and a side piston arranged on the through hole.

[0017] As a preferred solution of the welding auxiliary device of the stainless steel fin tube of the present invention, the outward expansion component includes a fixing part and a lifting part arranged on the connecting component, and the fixing part includes a connecting ring arranged on the movable block, a connecting tube arranged on the connecting ring, a bottom groove arranged on the connecting tube, a side hole arranged on the bottom groove, and a terminal cavity arranged on the connecting tube.

[0018] As a preferred solution of the welding auxiliary device of the stainless steel finned tube of the present invention, the lifting member includes a translation rod arranged on the side piston, a cone arranged on the translation rod, an outer wall of the cone abuts against an inclined column, a fixed arc plate is provided at one end of the inclined column away from the cone, a third spring is provided between the fixed arc plate and the bottom groove, a reset plate is fixedly connected to one end of the translation rod away from the side piston, and a reset spring is provided between the reset plate and the end cavity.

[0019] The welding auxiliary device for stainless steel finned tubes of the present invention has beneficial effects: the setting of the fixing mechanism can effectively limit the position of the external pipe fittings. During installation, it is only necessary to insert the pipe fittings into the fixing mechanism and press the fixing mechanism downward. After the fixing mechanism descends, the driving mechanism is driven to descend, so that the driving mechanism can fix the external pipe fittings. The setting of the connecting ring and the clamping arc can effectively fix the fixing mechanism at the bottom position of the through hole, thereby ensuring the limiting of the external pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0021] Figure 1 It is a partial cross-sectional view of the contact surface between the tube and the fin in the welding auxiliary device of the stainless steel fin tube.

[0022] Figure 2 Schematic diagram of the filling movement between parallel plates under the action of surface tension in the welding auxiliary device of stainless steel fin tubes.

[0023] Figure 3 It is a schematic diagram of the overall structure of the welding auxiliary device for stainless steel fin tubes.

[0024] Figure 4 It is a cross-sectional view of the overall structure of the welding auxiliary device of the stainless steel fin tube.

[0025] Figure 5 The present invention is a cross-sectional view of a receiving mechanism of a welding auxiliary device for stainless steel fin tubes.

[0026] Figure 6 This is a schematic diagram of the internal structure of the containing box of the welding auxiliary device for stainless steel fin tubes.

[0027] Figure 7 This is a schematic diagram of the structure of the external expansion component of the welding auxiliary device for stainless steel fin tubes.

[0028] Figure 8 This is a schematic diagram of the internal structure of the external expansion component of the welding auxiliary device for stainless steel fin tubes.

[0029] Fig. 9 for Figure 8 Enlarged view of the circular dotted frame.

[0030] Fig.10 This is a schematic diagram of the lifting component structure of the welding auxiliary device for stainless steel fin tubes. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Example 1, reference Figure 1 to Figure 2 , which is the first embodiment of the present invention, provides a welding auxiliary device for a stainless steel finned tube. When in use, one end of the tube is fixed on the auxiliary device, and the fin is inserted into the tube using a sleeve manufacturing process. A gap will be left between the fin and the tube after the operation is completed, and the fin and the tube are fixed using a vacuum brazing process.

[0035] Vacuum brazing requires that the solder melts and then fills into the gap between the fins and the tubes through the surface tension of the liquid. In this process, the contact surface between the tubes and the fins can be approximated as the filling flow process of the fluid in a parallel plate under the action of surface tension.

[0036] Reference Figure 2 , when calculating the laminar flow of incompressible, steady-state non-Newtonian fluids, the Washburn equation is used.

[0037] The following formula can be derived:

[0038]

[0039] t——time;

[0040] xf——the position of the fluid flow front at time t;

[0041] σ——surface tension coefficient;

[0042] h is the distance between parallel plates;

[0043] θ——wetting angle;

[0044] η——Viscosity coefficient of fluid.

[0045] Assume that the total length of the gap between the fin and the tube is L. Since the time tf required for the fluid to fill the gap L between the parallel plates under tension can be regarded as an unlimited length, the maximum distance between the fin and the tube can be deduced from the above equation as:

[0046]

[0047] h——the distance between the fin and the tube;

[0048] tf——The time required for the solder liquid to fill the gap L between the fin and the tube;

[0049] σ——surface tension coefficient of soldering liquid;

[0050] θ——wetting angle;

[0051] η——Viscosity coefficient of soldering liquid;

[0052] L is the gap length between the fin and the tube.

[0053] Reference Figure 1 and Figure 2 Under the condition that the length of the gap between the fin and the tube is known, the parameter h in the above equation can be solved to determine the maximum height of the gap between the fin and the tube that the molten solder can fill. This value is the key data for controlling the quality of the brazing weld between the fin and the tube.

[0054] In summary, the vacuum brazing technology is used to replace the traditional welding or mechanical connection technology to produce fin tubes, thereby improving the production efficiency and connection quality of stainless steel fin tubes.

[0055] Example 2, reference Figures 3 to 6 A welding auxiliary device for a stainless steel fin tube includes an auxiliary device, wherein the auxiliary device includes a accommodating mechanism 100, a driving mechanism 200 arranged on the accommodating mechanism 100, and a fixing mechanism 300 arranged on the driving mechanism 200. The accommodating mechanism 100 includes a base 101, a accommodating box 102 arranged on the base 101, and a through hole 103 and a clamping arc 104 arranged on the accommodating box 102; the driving mechanism 200 includes a accommodating component 201 arranged on the accommodating box 102, and a movable component 202 arranged on the accommodating component 201; the fixing mechanism 300 includes a connecting component 301 arranged on the movable component 202, and an outward expansion component 302 arranged on the connecting component 301.

[0056] Specifically, during use, the setting of the accommodating mechanism 100 can effectively limit the driving mechanism 200 and the fixing mechanism 300, ensuring that the driving mechanism 200 and the fixing mechanism 300 can operate stably. The cross-section of the accommodating box 102 is rectangular, and the top of the accommodating box 102 is arc-shaped. The accommodating box 102 is made of stainless steel. The bottom of the accommodating box 102 is fixedly connected to the base 101. The cross-section of the base 101 is circular. The setting of the base 101 can effectively fix the accommodating box 102. The clamping arc 104 is compatible with the connecting ring 302a-1. The setting of the connecting ring 302a-1 and the clamping arc 104 can effectively fix the fixing mechanism 300 at the bottom position of the through hole 103, thereby ensuring the limiting of the external pipe fittings. When the limiting needs to be cancelled, the connecting ring 302a-1 is lifted upward with force, and the connecting ring 302a-1 is separated from the clamping arc 104 to cancel the limiting of the external pipe fittings.

[0057] The accommodating assembly 201 includes an oil storage tank 201a disposed inside the accommodating box 102, holes 201b disposed on both sides of the oil storage tank 201a, an isolation plate 201c disposed at the center of the oil storage tank 201a, a slave piston 201d disposed inside the oil storage tank 201a, and a first spring 201e disposed on the slave piston 201d. The movable assembly 202 includes a limit rod 202a disposed on the slave piston 201d, a lifting plate 202b disposed on the limit rod 202a, a limit frame 202c disposed on the lifting plate 202b, a side rod 202d disposed on the limit frame 202c, and a driving piston 202e disposed at the bottom of the side rod 202d, and the lifting plate 202b is slidably connected to the limit frame 202c. The side rod 202d and the limit rod 202a are both slidably connected to the limit frame 202c, the oil storage tank 201a is slidably connected to the limit rod 202a, an oil storage cavity is provided between the accommodating box 102 and the oil storage tank 201a, the driving piston 202e is provided inside the oil storage cavity, and the driving piston 202e is adapted to the oil storage cavity, and the outer wall of the driving piston 202e is in contact with the inner wall of the accommodating box 102.

[0058] Furthermore, the cross-section of the oil storage tank 201a is rectangular, the bottom of the oil storage tank 201a is fixedly connected to the bottom of the accommodating box 102, oil is provided inside the oil storage tank 201a, the cross-section of the hole body 201b is rectangular, and the setting of the hole body 201b can effectively guide the oil inside the oil storage tank 201a to the oil storage cavity, so that the oil storage cavity is connected to the oil inside the oil storage tank 201a, and the setting of the first spring 201e can effectively drive the driven piston 201d to reset, the cross-section of the driven piston 201d is rectangular, the driven piston 201d is made of rubber, and the driven piston 201d is slidably connected to the inner wall of the oil storage tank 201a, and the driven piston 201d can effectively squeeze the oil storage tank 201a during its movement. 1a, when the oil pressure inside the oil storage tank 201a increases, it can effectively drive the driven piston 201d to move upward. When the bottom of the driven piston 201d is under negative pressure, the driven piston 201d descends. The cross-section of the limit rod 202a is circular. The number of the limit rods 202a is four, and the four limit rods 202a are arranged in a strip array. The outer wall of the limit rod 202a is in contact with the inner wall of the first spring 201e. The setting of the limit rod 202a can effectively limit the first spring 201e to prevent the first spring 201e from being damaged when it is excessively bent. The number of the side rods 202d is two, and the side rods 202d are located on both sides of the inner wall of the accommodating box 102. The cross-section of the side rods 202d is rectangular.

[0059] When in use, the pipe fitting is inserted into the outer expansion component 302 in the fixing mechanism 300, and the pipe fitting is inserted into the outer expansion component 302 and pressed down. During the process of the outer expansion component 302 descending, the connecting component 301 is driven to descend, and the side rod 202d in the connecting component 301 descends. The descending of the side rod 202d drives the driving piston 202e to descend. The descending of the driving piston 202e drives the oil inside it to enter the oil storage tank 201a through the hole body 201b, so that the oil inside the oil storage tank 201a squeezes the driven piston 201d to rise, and the driven piston 201d rises and squeezes the first spring 201e, forcing the first spring 20 1e contracts and accumulates elastic potential energy. During the rising process of the driven piston 201d, the limit rod 202a is driven to rise. The rising of the limit rod 202a drives the lifting plate 202b to rise. The rising of the lifting plate 202b squeezes the connecting component 301, thereby forcing the external expansion component 302 to start. The external expansion component 302 can be started to fix the external pipe fittings. When the fixation is completed, the external expansion component 302 is moved upward. At this time, the side rod 202d loses power. The kinetic energy brought by the upward moving external expansion component 302 and the extension of the first spring 201e drives the oil in the oil storage tank 201a to flow back and forces the driving piston 202e to reset. At this time, the device is reset.

[0060] In summary, the setting of the base 101 can effectively fix the containing box 102, and the clamping arc 104 is compatible with the connecting ring 302a-1. The setting of the connecting ring 302a-1 and the clamping arc 104 can effectively fix the fixing mechanism 300 at the bottom position of the through hole 103, thereby ensuring the limitation of the external pipe fittings.

[0061] Example 3, reference Figures 3 to 10 , which is the third embodiment of the present invention. Different from the previous embodiment, the fixing mechanism 300 includes a connecting component 301 arranged on the movable component 202, an external expansion component 302 arranged on the connecting component 301, the connecting component 301 includes an external component 301a arranged inside the accommodating box 102, and an extrusion component 301b arranged on the external component 301a; the external component 301a includes a movable block 301a-1 arranged on the side rod 202d, a bottom cavity 301a-2 arranged at the bottom of the movable block 301a-1, a second spring 301a-3 arranged in the bottom cavity 301a-2, and a push plate 301a-4 arranged on the second spring 301a-3; the extrusion component 301b includes a through hole 301b-1 arranged on one side of the bottom cavity 301a-2, and a side piston 301b-2 arranged on the through hole 301b-1.

[0062] Specifically, the setting of the fixing mechanism 300 can effectively limit the pipe fitting, so that the setting of the connecting component 301 can effectively connect the driving mechanism 200 at the bottom with the extrusion member 301b, the cross-section of the movable block 301a-1 is rectangular, the movable block 301a-1 is slidingly connected to the containing box 102, the wall thickness of the containing box 102 is not less than one millimeter, the cross-section of the bottom cavity 301a-2 is rectangular, and oil is provided inside the bottom cavity 301a-2, the bottom box is adapted to the through hole 301b-1, and the through hole 301b-1 is adapted to the side piston 301b-2.

[0063] The outward expansion component 302 includes a fixing part 302a and a lifting part 302b arranged on the connecting component 301, and the fixing part 302a includes a connecting ring 302a-1 arranged on the movable block 301a-1, a connecting tube 302a-2 arranged on the connecting ring 302a-1, a bottom groove 302a-3 arranged on the connecting tube 302a-2, a side hole 302a-4 arranged on the bottom groove 302a-3, and an end cavity 302a-5 arranged on the connecting tube 302a-2. The lifting member 302b includes a translation rod 302b-1 arranged on the side piston 301b-2, and a cone 302b-2 arranged on the translation rod 302b-1. The outer wall of the cone 302b-2 is in contact with an inclined column 302b-3, and the end of the inclined column 302b-3 away from the cone 302b-2 is provided with a fixed arc plate 302b-4, and a third spring 302b-5 is provided between the fixed arc plate 302b-4 and the bottom groove 302a-3. The end of the translation rod 302b-1 away from the side piston 301b-2 is fixedly connected to a reset plate 302b-6, and a reset spring 302b-7 is provided between the reset plate 302b-6 and the end chamber 302a-5.

[0064] Furthermore, the cross section of the connecting ring 302a-1 is circular, and a slot is provided at the bottom of the connecting ring 302a-1, which is adapted to the arc 104. When docking is required, the slot and the arc 104 only need to be pressed, and the slot limits the arc 104 under the action of elastic force to prevent it from moving. When removal is required, the slot can be pulled up. The cross section of the end cavity 302a-5 is circular, and the reset plate 302b-6 is located in the end cavity 30 In 2a-5, the cross-sections of the reset plate 302b-6 and the end chamber 302a-5 are both circular, the reset plate 302b-6 and the end chamber 302a-5 are slidably connected, the two ends of the reset spring 302b-7 are fixedly connected to the reset plate 302b-6 and the end chamber 302a-5 respectively, oil is provided between the bottom chamber 301a-2 and the push plate 301a-4 and the side piston 301b-2, and the inclined column 302b-3 is made of rubber.

[0065] The rest of the structure is the same as that of Example 2.

[0066] When in use, when the connecting assembly 301 is located at the bottom of the through hole 103, the connecting ring 302a-1 is engaged with the clamping arc 104, and the lifting plate 202b rises to squeeze the push plate 301a-4. During the rising process of the push plate 301a-4, the oil inside it is squeezed, so that the push plate 301a-4 drives the oil to squeeze the side piston 301b-2. During the movement of the side piston 301b-2, the translation rod 302b-1 and the cone 302b-2 are moved. During the movement of the translation rod 302b-1, the reset plate 302b-6 is driven to move. During the movement of the reset plate 302b-6, the reset spring 30 2b-7 contracts, thereby accumulating elastic potential energy, and can be reset without the action of the side piston 301b-2. The cone 302b-2 drives the inclined column 302b-3 and the fixed arc plate 302b-4 to move. During the movement of the fixed arc plate 302b-4, the third spring 302b-5 is extended, thereby accumulating elastic potential energy. During the movement of the fixed arc plate 302b-4, the pipe fitting can be fixed. After the fixation is completed, when it needs to be disassembled, the connecting assembly 301 is moved upward. At this time, the arc 104 is disengaged from the connecting ring 302a-1, and the side piston 301b-2 loses thrust, and the pipe fitting can be removed.

[0067] In summary, the setting of the fixing mechanism 300 can effectively limit the position of the pipe, so that the setting of the connecting component 301 can effectively connect the driving mechanism 200 at the bottom with the extrusion component 301b.

[0068] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0069] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0070] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A welding auxiliary device for stainless steel finned tubes, characterized in that: When in use, one end of the pipe is fixed on the auxiliary device, and the fin is inserted into the pipe by using the sleeve manufacturing process. There will be a gap between the fin and the pipe after the operation is completed. The fin and the pipe are fixed by using the vacuum brazing process; Vacuum brazing requires the solder to melt and then fill into the gap between the fin and the tube through the surface tension of the liquid. In this process, the contact surface between the tube and the fin can be approximated as the filling flow process of the fluid in a parallel plate under the action of surface tension. When calculating the laminar flow of incompressible, steady-state non-Newtonian fluids, the Washburn equation is used to determine the interval between the fin and the pipe that the molten solder fills to avoid the interval being too large and affecting the connection effect; The auxiliary device comprises a containing mechanism (100), a driving mechanism (200) arranged on the containing mechanism (100), a fixing mechanism (300) arranged on the driving mechanism (200), The accommodating mechanism (100) comprises a base (101), a accommodating box (102) arranged on the base (101), and a through hole (103) and a clamping arc (104) arranged on the accommodating box (102); The driving mechanism (200) comprises a containing component (201) arranged on the containing box (102), and a movable component (202) arranged on the containing component (201); The fixing mechanism (300) comprises a connecting component (301) arranged on the movable component (202), and an outward expansion component (302) arranged on the connecting component (301); The accommodating assembly (201) comprises an oil storage tank (201a) arranged inside the accommodating box (102), hole bodies (201b) arranged on both sides of the oil storage tank (201a), an isolation plate (201c) arranged at the center of the oil storage tank (201a), a driven piston (201d) arranged inside the oil storage tank (201a), and a first spring (201e) arranged on the driven piston (201d); The movable component (202) comprises a limiting rod (202a) arranged on the driven piston (201d), a lifting plate (202b) arranged on the limiting rod (202a), a limiting frame (202c) arranged on the lifting plate (202b), a side rod (202d) arranged on the limiting frame (202c), and a driving piston (202e) arranged at the bottom of the side rod (202d), and the lifting plate (202b) is slidably connected to the limiting frame (202c); The side rod (202d) and the limiting rod (202a) are both slidably connected to the limiting frame (202c); the oil storage box (201a) is slidably connected to the limiting rod (202a); an oil storage cavity is provided between the containing box (102) and the oil storage box (201a); the driving piston (202e) is provided inside the oil storage cavity, and the driving piston (202e) is adapted to the oil storage cavity; the outer wall of the driving piston (202e) is in contact with the inner wall of the containing box (102); The connection assembly (301) comprises an external component (301a) arranged inside the accommodating box (102), and an extrusion component (301b) arranged on the external component (301a); The external component (301a) comprises a movable block (301a-1) arranged on the side rod (202d), a bottom cavity (301a-2) arranged at the bottom of the movable block (301a-1), a second spring (301a-3) arranged in the bottom cavity (301a-2), and a push plate (301a-4) arranged on the second spring (301a-3); the extrusion component (301b) comprises a through hole (301b-1) arranged on one side of the bottom cavity (301a-2), and a side piston (301b-2) arranged on the through hole (301b-1); The outward expansion component (302) comprises a fixing member (302a) and a lifting member (302b) arranged on the connecting component (301); the fixing member (302a) comprises a connecting ring (302a-1) arranged on the movable block (301a-1), a connecting tube (302a-2) arranged on the connecting ring (302a-1), a bottom groove (302a-3) arranged on the connecting tube (302a-2), a side hole (302a-4) arranged on the bottom groove (302a-3), and a terminal cavity (302a-5) arranged on the connecting tube (302a-2); The lifting member (302b) comprises a translation rod (302b-1) arranged on the side piston (301b-2), a cone (302b-2) arranged on the translation rod (302b-1), an outer wall of the cone (302b-2) abutting against an inclined column (302b-3), an end of the inclined column (302b-3) away from the cone (302b-2) is provided with a fixed arc plate (302b-4), a third spring (302b-5) is provided between the fixed arc plate (302b-4) and the bottom groove (302a-3), and a reset plate (302b-6) is fixedly connected to the end of the translation rod (302b-1) away from the side piston (301b-2), and a reset spring (302b-7) is provided between the reset plate (302b-6) and the end chamber (302a-5).

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