Welding nitrogen charge foolproof device

Abstract

The present application relates to copper pipe welding technical field, especially a kind of welding nitrogen-filled foolproof device, including the three-way connecting pipe of external nitrogen gas delivery pipe, external installation frame and welding torch, external installation frame includes first assembly frame and second assembly frame, first assembly frame and second assembly frame inside are equipped with synchronous locking ejector rod, electric control type angle adjusting frame is provided on the side wall of first assembly frame and second assembly frame.The welding nitrogen-filled foolproof device of the present application detects whether the flow of nitrogen gas inside and outside copper pipe conforms to welding specification by external probe, to control the time of nitrogen-filled protection, so that it reaches perfect oxygen removal effect, prevents scale generation;By using external installation frame, welding torch can be fixed outside copper pipe, which is convenient for dismounting and fixing, convenient for assembly and use, and improves the stability during welding process.

Description

Technical Field

[0001] This invention relates to the field of copper pipe welding technology, and in particular to a nitrogen-filling anti-mistake device for welding. Background Technology

[0002] Because copper pipes are highly susceptible to oxidation during brazing, oxide scale forms inside the pipes, which can cause blockages in the refrigerant system, leading to problems with valves, compressors, and other components. To effectively reduce oxide scale formation during copper pipe brazing, current brazing processes require nitrogen protection. This involves using nitrogen to purge oxygen from the copper pipes, creating a protective atmosphere to prevent internal oxidation and reduce the likelihood of oxide scale formation within the refrigerant system.

[0003] However, during operation, operators are prone to making mistakes in two aspects, resulting in poor nitrogen protection: ① The nitrogen pipeline is not in contact with the copper pipe, resulting in insufficient nitrogen filling; ② The nitrogen filling time is not controlled, and copper pipe welding is carried out before the oxygen inside the copper pipe is completely purged; or the nitrogen filling is canceled before the copper pipe has cooled down, so that oxygen can still react with the copper pipe when it enters the pipeline, producing oxide scale. Summary of the Invention

[0004] The technical problem to be solved by this invention is that: the nitrogen pipeline does not come into contact with the copper pipe, resulting in insufficient nitrogen filling effect; the nitrogen filling time is not controlled, and copper pipe welding is carried out before the oxygen inside the copper pipe is completely purged; or the nitrogen filling is canceled before the copper pipe is cooled, resulting in oxygen entering the pipeline and still reacting with the copper pipe to produce oxide scale.

[0005] The technical solution adopted by this invention to solve its technical problem is: a welding nitrogen filling error prevention device, including a three-way connecting pipe for external nitrogen supply pipe, an external mounting frame and a welding torch. The external mounting frame includes a first assembly frame and a second assembly frame. Both the first and second assembly frames are equipped with synchronous locking rods. Electrically controlled angle adjustment frames are provided on the side walls of the first and second assembly frames. An external assembly frame for assembling the welding torch is installed on the outer surface of the electrically controlled angle adjustment frame. An external gas guide connecting pipe for connecting the three-way connecting pipe is fixedly installed on the side walls of the first and second assembly frames. An external assembly nozzle is installed at the outlet of the three-way connecting pipe through an external gas guide hose. An electrically controlled regulating valve for controlling the internal flow rate is installed inside the three-way connecting pipe. An external probe for monitoring oxygen content is connected to the outside of the three-way connecting pipe through a signal transmission line.

[0006] The first assembly frame and the second assembly frame are movably assembled through an assembly pivot inside the connecting end bracket. The non-movable connecting end of the first assembly frame has an outwardly protruding integral structure of an external locking frame, and the non-movable connecting end of the second assembly frame has an external locking block that cooperates with the external locking frame.

[0007] Both the first and second assembly frames have arc-shaped internal assembly grooves with openings on both sides on their inner arc surfaces. The synchronous locking top rod includes an arc-shaped rack that is slidably assembled inside the arc-shaped internal assembly groove, an external guide seat that is fixed at the outer opening of the arc-shaped internal assembly groove, an internal thread adjusting tube that is movably installed inside the external guide seat, an external thread adjusting rod that is threaded into the internal thread adjusting tube, and an internal extrusion head that is axially assembled at one end of the external thread adjusting rod.

[0008] The first and second assembly frames have an arc-shaped external assembly groove on their outer planes that communicates with the external assembly nozzle. The electrically controlled angle adjustment frame includes an external adjustment motor fixed on the outer surface of the first assembly frame, an arc-shaped adjustment seat slidably inserted into the arc-shaped external assembly groove, and an external connection frame fixed on the outer surface of the arc-shaped adjustment seat.

[0009] The external assembly frame includes a flip bracket connected to the outside of the external connection frame by horizontal bolts, an external mounting frame fixed to the outside of the flip bracket, and locking bolts threaded onto the outer wall of the external mounting frame.

[0010] Both the external assembly nozzle and the external probe are equipped with external assembly covers on their outer surfaces, and external fixing bolts are threaded onto the outer arc-shaped surface of the external assembly covers.

[0011] An external adjusting shaft that meshes with an arc-shaped rack is movably inserted into the outer side of the second assembly frame, and an external linkage gear ring that meshes with the arc-shaped rack is present on the outer arc-shaped surface of the internal thread adjusting tube.

[0012] A fan-shaped opening is provided on the outer surface of the external mounting cover of the external probe.

[0013] The arc-shaped external assembly groove is connected to the external air guide pipe, and the arc-shaped adjustment seat has an arc-shaped internal air vent.

[0014] An adjusting gear is axially fixed on the adjusting shaft of the external adjusting motor, and an arc-shaped tooth groove that cooperates with the adjusting gear is opened on the side wall of the arc-shaped adjusting seat.

[0015] The beneficial effects of this invention are:

[0016] (1) The welding nitrogen filling and error prevention device of the present invention detects whether the flow rate of nitrogen inside and outside the copper tube meets the welding specifications by using an external probe, thereby controlling the nitrogen filling protection time so as to achieve a good oxygen removal effect and prevent oxide scale from being generated.

[0017] (2) By using an external mounting frame, the welding gun can be fixed to the outside of the copper pipe, which is convenient for mounting and dismounting, easy for assembly and use, and at the same time improves the stability during the welding process;

[0018] (3) By utilizing the synchronous locking rods inside the first and second assembly frames, the equipment can be adapted to copper pipes of different specifications and sizes, making it more widely applicable.

[0019] (4) An external gas guide pipe for connecting a three-way connecting pipe is fixedly mounted on the side wall of the first and second assembly frames. With the help of an external assembly nozzle installed inside the opening at one end of the copper pipe, nitrogen can be filled into the inside and outside of the copper pipe respectively. An external probe is set at the outlet of the copper pipe to accurately determine the oxygen removal time and effect, and then automatically adjust the nitrogen filling flow to reduce energy consumption and ensure welding effect.

[0020] (5) The entire device is loaded and unloaded by opening and closing, making the loading and unloading operation simple and convenient. Attached Figure Description

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

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is an internal sectional view of the external mounting frame in this invention.

[0024] Figure 3 This is a partial internal view of the externally assembled nozzle and externally assembled probe in the present invention.

[0025] Figure 4 This is a schematic diagram of the nitrogen control principle in this invention. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Figure 1 , Figure 2 and Figure 3 The welding nitrogen filling and error prevention device shown includes a three-way connecting pipe 1 for external nitrogen supply pipe, an external mounting frame and a welding torch 2. The external mounting frame includes a first assembly frame 3 and a second assembly frame 4. Both the first assembly frame 3 and the second assembly frame 4 are equipped with synchronous locking rods 5. Electrically controlled angle adjustment frames 6 are provided on the side walls of the first assembly frame 3 and the second assembly frame 4. An external assembly frame 7 for assembling the welding torch 2 is installed on the outer surface of the electrically controlled angle adjustment frame 6. An external gas guide connecting pipe 8 for connecting the three-way connecting pipe 1 is fixedly installed on the side walls of the first assembly frame 3 and the second assembly frame 4. An external assembly nozzle 10 is installed at the outlet of the three-way connecting pipe 1 through an external gas guide hose 9. An electrically controlled regulating valve 11 for controlling the internal flow is installed inside the three-way connecting pipe 1. An external probe 12 for monitoring oxygen content is connected to the outside of the three-way connecting pipe 1 through a signal transmission line.

[0029] The welding torch 2, the electrically controlled regulating valve 11, and the external probe 12 are all existing technologies. The welding torch 2 is used to weld the joint of the steel pipe, the electrically controlled regulating valve 11 is used to control the flow rate inside the three-way connecting pipe 1, and the external probe 12 is used to monitor the oxygen content at the detection location.

[0030] To facilitate snap-fit ​​fixing, the first assembly frame 3 and the second assembly frame 4 are movably assembled via the assembly pivot inside the connecting end bracket 13. The non-movable connecting end of the first assembly frame 3 has an outwardly protruding integral structure of the external locking frame 14, and the non-movable connecting end of the second assembly frame 4 has an external locking block 15 that cooperates with the external locking frame 14.

[0031] The first assembly frame 3 and the second assembly frame 4 are rotated and adjusted along the assembly pivot inside the connecting end bracket 13. Finally, the second assembly frame 4 inserts the external locking block 15 into the external locking frame 14 to fix and assemble with the first assembly frame 3, forming a ring-shaped assembly frame.

[0032] To facilitate telescopic adjustment and fixation, both the inner arc-shaped surfaces of the first assembly frame 3 and the second assembly frame 4 are provided with arc-shaped internal assembly grooves 16 with openings on both sides. The synchronous locking top rod 5 includes an arc-shaped rack 51 that is slidably assembled inside the arc-shaped internal assembly groove 16, an external guide seat 52 that is fixed at the outer opening of the arc-shaped internal assembly groove 16, an internal thread adjusting tube 53 that is movably installed inside the external guide seat 52, an external thread adjusting rod 54 that is threaded into the internal thread adjusting tube 53, and an internal extrusion head 55 that is axially assembled at one end of the external thread adjusting rod 54.

[0033] The arc-shaped internal assembly grooves 16 on the inner arc-shaped surfaces of the first assembly frame 3 and the second assembly frame 4 are spliced ​​together to form an externally constricted annular internal sliding groove.

[0034] The inner wall of the outer guide seat 52 has an inwardly protruding limiting block. The outer thread side wall of the external thread adjusting rod 54 is provided with a strip-shaped limiting groove that cooperates with the limiting frame. The limiting block can be inserted into the strip-shaped limiting groove to limit the rotation of the external thread adjusting rod 54. When the internal thread adjusting tube 53 rotates, it can control the external thread adjusting rod 54 to extend and retract along the through hole inside the outer guide seat 52. Thus, the internal extrusion head 55 at one end of the external thread adjusting rod 54 can be used to extrude the outer wall of the steel pipe to achieve fixed assembly.

[0035] To facilitate electronic adjustment, an arc-shaped external assembly groove 17 connected to the external assembly nozzle 10 is provided on the outer plane of the first assembly frame 3 and the second assembly frame 4. The electronically controlled angle adjustment frame 6 includes an external adjustment motor 61 fixed on the outer surface of the first assembly frame 3, an arc-shaped adjustment seat 62 slidably inserted into the arc-shaped external assembly groove 17, and an external connection frame 63 fixed on the outer surface of the arc-shaped adjustment seat 62.

[0036] The external adjustment motor 61 is existing technology and is used to drive the arc-shaped adjustment seat 62 to rotate along the arc-shaped external assembly groove 17. The arc-shaped external assembly grooves 17 on the outer plane of the first assembly frame 3 and the second assembly frame 4 are spliced ​​together to form an externally constricted annular external slide groove.

[0037] In order to lock and fix the welding torch 2 at the same angle, the outer assembly frame 7 includes a flip bracket 71 connected to the outside of the outer connecting frame 63 by a horizontal bolt, an outer mounting frame 72 fixed to the outside of the flip bracket 71, and a locking bolt 73 threaded onto the outer wall of the outer mounting frame 72.

[0038] The friction is increased by locking the flip bracket 71 and the outer mounting frame 72 with the locking bolt 73, thereby fixing the angle between the flip bracket 71 and the outer mounting frame 72.

[0039] To facilitate external assembly and fixation, external assembly covers 18 are installed on the outer surfaces of both the external assembly nozzle 10 and the external probe 12, and external fixing bolts 19 are threaded onto the outer arc-shaped surface of the external assembly cover 18.

[0040] The external assembly nozzle 10 is inserted into the air inlet of the copper pipe, and the external assembly cover 18 is fitted over the air inlet of the copper pipe. Then, the external fixing bolt 19 is rotated, and the external fixing bolt 19 is pressed against the outer wall of the copper pipe, thereby fixing the external assembly nozzle 10 and its outer external assembly cover 18 to the outside of the copper pipe. The external assembly cover 18 is used to close and seal the air inlet of the copper pipe. Similarly, the external probe 12 is fixed at the air outlet of the copper pipe. The probe controls the internal electronic control regulating valve 11 of the three-way connecting pipe 1 according to the oxygen content in the air at the air outlet, thereby regulating the nitrogen charging volume. Initially, the nitrogen is charged quickly and at a high flow rate. After the oxygen is purged, the charging volume is reduced, and then the operation is carried out at a constant speed. Alternatively, the tube can be charged at a high flow rate initially, and then the charging volume in the tube can be reduced to the minimum exhaust volume after the oxygen is purged. Then, the gas supply volume from the external to the external air guide connecting pipe 8 can be increased.

[0041] To facilitate external adjustment, an external adjustment shaft 20 that meshes with the arc-shaped rack 51 is movably inserted into the outer side of the second assembly frame 4, and an external linkage gear ring 21 that meshes with the arc-shaped rack 51 is provided on the outer arc-shaped surface of the internal thread adjustment tube 53.

[0042] The inner end of the external adjusting shaft 20 meshes with the inner wall of the transmission groove on the outer arc surface of the arc rack 51. By rotating the external adjusting shaft 20, the arc rack 51 can be driven to rotate. When the arc rack 51 rotates, the external linkage gear ring 21 that meshes with the arc rack 51 will synchronously drive the internal thread adjusting tube 53 to rotate.

[0043] To facilitate lateral exhaust, a fan-shaped opening is provided on the outer surface of the external mounting cover 18 of the external probe 12.

[0044] The purpose of setting a fan-shaped opening at the outlet is to allow the air inside the copper tube to be expelled laterally.

[0045] To facilitate ventilation, the interior of the arc-shaped external mounting groove 17 is connected to the external air guide pipe 8, and the interior of the arc-shaped adjusting seat 62 is provided with an arc-shaped internal air vent 22.

[0046] The purpose of setting the arc-shaped internal vent 22 is to allow the nitrogen gas to be injected into the external gas guide pipe 8 and then sprayed onto the welding end face through the arc-shaped internal vent 22.

[0047] In order to coordinate with the transmission adjustment and thus control the welding torch 2 to rotate and weld along the copper tube, an adjustment gear 23 is axially fixed on the adjustment shaft of the external adjustment motor 61, and an arc-shaped tooth groove 24 that cooperates with the adjustment gear 23 is opened on the side wall of the arc-shaped adjustment seat 62.

[0048] The external adjustment motor 61 drives the adjustment gear 23 to rotate, and then the adjustment gear 23 drives the arc-shaped tooth groove 24 that meshes with it to start moving. The arc-shaped adjustment seats 62 inside the first assembly frame 3 and the second assembly frame 4 are spliced ​​together to form a ring structure inside a closed-loop groove. The two arc-shaped tooth grooves 24 are spliced ​​together to form a ring tooth groove. In this way, the adjustment gear 23 can drive the entire arc-shaped adjustment seat 62 to rotate and adjust along the arc-shaped outer assembly groove 17.

[0049] like Figure 4 The nitrogen pipeline shown is connected to a gas differential pressure gauge in the prior art. When the instrument displays a normal reading, it proves that the nitrogen pipeline is open.

[0050] Nitrogen gas is regulated using existing mechanical or electronic flow meters to achieve the required flow rate for welding specifications. If the flow rate falls below the required level, the mechanical or electronic flow meter will send a signal to the control system to trigger an alarm.

[0051] The control system is based on existing technology and is used to control the entire welding operation process.

[0052] 1) There are existing induction switches on the nitrogen pipeline leading out of the device. They are installed on the connection surface between the outer assembly cover 18 and the steel pipe and the connection surface between the inner extrusion head 55 and the outer wall of the steel pipe, respectively. Check whether the nitrogen pipeline is properly connected to the copper pipe of the product before proceeding with the inflation operation.

[0053] 2) The nitrogen purging sensor switch forms a circuit with the product, which in turn triggers the nitrogen purging timer of the control system. The nitrogen purging time can be set before welding, during welding, and after welding; however, if the purging time does not meet the set requirements, the device will issue an alarm.

[0054] 3) The nitrogen filling device is externally connected to a three-color lamp of existing technology as an indicator light for the nitrogen filling status.

[0055] a. Blue light on: Pre-welding nitrogen purging time meets requirements;

[0056] b. Green light on: Nitrogen purging time during welding meets requirements;

[0057] c. Blue, green, and yellow lights illuminate: The nitrogen purging time after welding meets the requirements.

[0058] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A welding nitrogen-filling error-proof device, comprising a tee connector (1) for an external nitrogen supply pipe, an external mounting frame, and a welding torch (2), characterized in that: The external mounting frame includes a first assembly frame (3) and a second assembly frame (4). Both the first assembly frame (3) and the second assembly frame (4) have arc-shaped internal mounting grooves (16) with openings on both sides on their inner arc surfaces. Both the first assembly frame (3) and the second assembly frame (4) are equipped with synchronous locking rods (5). The synchronous locking rods (5) include an arc-shaped rack (51) that is slidably mounted inside the arc-shaped internal mounting groove (16) and an external guide that is fixed at the opening position on the outside of the arc-shaped internal mounting groove (16). The assembly includes a guide seat (52), an internal threaded adjusting tube (53) movably installed inside the external guide seat (52), an external threaded adjusting rod (54) threaded into the internal threaded adjusting tube (53), and an internal extrusion head (55) axially mounted on one end of the external threaded adjusting rod (54); an external adjusting shaft (20) that meshes with an arc-shaped rack (51) is movably inserted into the outer side of the second assembly frame (4), and an external linkage gear ring (21) that meshes with the arc-shaped rack on the outer arc surface of the internal threaded adjusting tube. The first assembly frame (3) and the second assembly frame (4) are provided with an arc-shaped external assembly groove (17) on their outer planes. The first assembly frame (3) and the second assembly frame (4) are provided with an electrically controlled angle adjustment frame (6) on their side walls. The electrically controlled angle adjustment frame (6) includes an external adjustment motor (61) fixed on the outer side of the first assembly frame (3), an arc-shaped adjustment seat (62) slidably inserted into the arc-shaped external assembly groove (17), and an external connecting frame (63) fixed on the outer side of the arc-shaped adjustment seat (62). An adjustment gear (23) is axially fixed on the adjustment shaft of the external adjustment motor (61). An arc-shaped tooth groove (24) that cooperates with the adjustment gear (23) is provided on the side wall of the arc-shaped adjustment seat (62). An external assembly frame (7) for assembling a welding torch (2) is installed on the outer side of the electrically controlled angle adjustment frame (6). An external gas guide pipe (8) for connecting a three-way connecting pipe (1) is fixedly installed on the side walls of the first assembly frame (3) and the second assembly frame (4). The arc-shaped external assembly groove (17) is connected to the external gas guide pipe (8). An arc-shaped internal vent (22) is opened inside the arc-shaped adjustment seat (62). The outlet of the three-way connecting pipe (1) is equipped with an external assembly nozzle (10) through an external air guide hose (9). An electronically controlled regulating valve (11) for controlling the internal flow is installed inside the three-way connecting pipe (1). An external probe (12) for monitoring oxygen content is connected to the outside of the three-way connecting pipe (1) through a signal transmission line. Both the external assembly nozzle (10) and the external probe (12) are equipped with external assembly covers (18) on their outer surfaces. External fixing bolts (19) are threaded onto the outer arc-shaped surface of the external assembly cover (18). A fan-shaped opening is provided on the outer plane of the external assembly cover (18) of the external probe (12). An induction switch is installed on the nitrogen pipeline of the external nitrogen delivery pipe. The induction switch is installed on the connection surface between the external assembly cover (18) and the copper pipe and the connection surface between the internal extrusion head (55) and the outer wall of the copper pipe, respectively, to detect whether the nitrogen pipeline and the copper pipe are properly connected; the induction switch and the copper pipe form a loop to trigger the nitrogen filling timer of the control system. The control system is set with nitrogen purging time before welding, during welding, and after welding. When the nitrogen purging time does not meet the set requirements, the welding nitrogen purging error prevention device will alarm. The external probe (12) controls the electronically controlled regulating valve (11) according to the oxygen content at the outlet of the copper tube to adjust the nitrogen charging volume. During the oxygen purging stage, the nitrogen is charged at a large flow rate, and the charging volume is reduced after the oxygen purging is completed. The welding nitrogen-filling error-proof device is externally connected to a three-color light for indicating the nitrogen-filling status.

2. The welding nitrogen purging error prevention device according to claim 1, characterized in that: The first assembly frame (3) and the second assembly frame (4) are movably assembled through the assembly pivot inside the connecting end bracket (13). The non-movable connecting end of the first assembly frame (3) has an outwardly protruding integral structure of an external locking frame (14), and the non-movable connecting end of the second assembly frame (4) has an external locking block (15) that cooperates with the external locking frame (14).

3. The welding nitrogen purging error-proof device according to claim 1, characterized in that: The external assembly frame (7) includes a flip bracket (71) connected to the outside of the external connection frame (63) by a horizontal bolt, an external mounting frame (72) fixed to the outside of the flip bracket (71), and a locking bolt (73) threaded onto the outer wall of the external mounting frame (72).

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