A gas protection device

Abstract

The present invention discloses a gas protection device for a pipe butt welding structure, the gas protection device comprises a gas outlet structure for sleeved on one end of the rod body, the gas outlet structure is used to form a first gap with the outer wall surface of the rod body, the first gap is connected with the air inlet gap; the gas outlet structure is also provided with an air inlet channel for connecting with the first gap. When the gas protection device is in use, the inert gas can be passed into the first gap through the air inlet channel, and the inert gas can achieve a basically stable flow direction after contacting the outer wall surface of the rod body in the first gap, that is, the inert gas can flow along the outer wall surface of the rod body as a whole; the gas protection device can make the inert gas reach the pipe butt welding structure to be welded along the air inlet gap, forming back gas protection of the inert gas.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a gas protection device for welding. Background Art

[0002] In the pipe butt welding structure, such as the welding process of the pipe butt single-sided welding and double-sided forming structure (such as the welding of the electric heating element of the voltage regulator of nuclear power equipment), it has high requirements for the gas protection environment of the inner wall of the pipe. Insufficient gas purity or excessive gas flow makes it difficult to ensure the quality of the final weld, which brings great troubles to the welding process of the product. In addition, the installation structure of the electric heating element of the voltage regulator of the nuclear power equipment includes a butt pipe and a sleeve of the electric heating element arranged inside the butt pipe. The sleeve of the electric heating element is rod-shaped as a whole, and there is a gap between the sleeve of the electric heating element and the inner wall surface of the butt pipe. The welding of this type of structure is also difficult. In view of the above problems, the main method currently used is to form an inert gas protection area on the back of the structure to be welded in a short time by pre-passing inert gas on the front, but the protection effect is not good.

[0003] Front pre-ventilation can only form a gas protection area in the back for a short time, and the purity of the gas in this area will be reduced due to mixing with air, resulting in poor protection effect. At the same time, front ventilation cannot detect the composition of the gas in the welding area, and cannot quantify whether the gas protection state can meet the welding needs, and can only be estimated through experience. Summary of the invention

[0004] In order to solve the above problems, the present invention aims to provide a back gas protection device applied to a pipe butt welding structure to solve the gas protection problem of the pipe butt welding structure.

[0005] To achieve the above object, the present invention is implemented according to the following technical solutions:

[0006] A gas protection device is used for a pipe butt welding structure, the pipe butt welding structure includes a butt tube and a rod body arranged in the butt tube, an air intake gap is provided between the outer wall surface of the rod body and the inner wall surface of the butt tube, the gas protection device includes an air outlet structure for being sleeved on one end of the rod body, the air outlet structure is used to form a first gap between the outer wall surface of the rod body, and the first gap is connected with the air intake gap; the air outlet structure is also provided with an air intake channel for connecting to the first gap.

[0007] Preferably, the air outlet structure includes a first sleeve for being sleeved on the rod body and a second sleeve for being sleeved on the first sleeve, the inner wall surface of the first sleeve is used to form the first gap with the outer wall surface of the rod body, and a second gap is provided between the outer wall surface of the first sleeve and the inner wall surface of the second sleeve, and the air outlet structure also includes a blocking structure for blocking both ends of the second gap; a connecting channel is provided on the tube wall of the first sleeve, one end of the connecting channel is used to communicate with the first gap, and the other end of the connecting channel is communicated with the second gap; the air inlet channel includes the second gap and the connecting channel, and the air inlet channel also includes an air inlet connected to the second gap.

[0008] Preferably, the sealing structure includes a first end plate sleeved on the rod body, the first end plate being fixedly connected to the end faces of the first sleeve and the second sleeve respectively; a first connecting through hole is provided on the first end plate, the inner wall surface of the first connecting through hole is used to abut against the outer wall surface of the rod body; the air inlet is arranged on the first end plate.

[0009] Preferably, the sealing structure also includes a second end plate for being sleeved on the rod body, the second end plate being fixedly connected to the end surface of the first sleeve away from the first end plate and the end surface of the second sleeve away from the first end plate respectively; a second connecting through hole is provided on the second end plate, and the inner wall surface of the second connecting through hole is used to abut against the outer wall surface of the rod body; at least one through groove is provided on the inner wall surface of the second connecting through hole, one end of the through groove is used to communicate with the first gap, and the other end of the through groove extends to the end surface of the second end plate away from the first sleeve.

[0010] Preferably, at least two through grooves are provided on the inner wall surface of the second connecting through hole, and the at least two through grooves are evenly distributed along the circumference of the second connecting through hole.

[0011] Preferably, the air outlet structure is provided with a snap-fitting surface, and the air outlet structure is divided into two parts that snap together by the snap-fitting surface. The first sleeve, the second sleeve, the first end plate, and the second end plate are all divided into two parts that extend as a whole along the axial direction of the first sleeve by the snap-fitting surface.

[0012] Preferably, the gas protection device also includes a fixing device for keeping the two parts of the gas outlet structure locked together, the fixing device includes a pivot structure for pivotally connecting the two parts of the gas outlet structure that are locked together, and the fixing device also includes a snap structure for snapping the two parts of the gas outlet structure that are locked together.

[0013] Preferably, the fixing device includes a pivot pin and a snap-fit ​​pin arranged on the second sleeve; the fixing device also includes a connecting arm, one end of the connecting arm is pivotally connected to the pivot pin, the other end of the connecting arm is snap-fitted to the snap-fit ​​pin, and the inner side of the connecting arm abuts against the outer wall surface of the second sleeve.

[0014] Preferably, the connecting channel comprises at least two groups of connecting hole rows arranged along the circumference of the first sleeve, and the connecting hole rows comprise connecting through holes arranged along the axial direction of the first sleeve.

[0015] Preferably, the distances from all the connecting through holes in the two adjacent connecting hole columns to the first end plate have a difference.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] When the gas protection device is in use, the inert gas can be introduced into the first gap through the air inlet passage, and the inert gas can achieve a basically stable flow direction after contacting the outer wall surface of the rod body in the first gap, that is, the inert gas can flow along the outer wall surface of the rod body as a whole; the gas protection device can make the inert gas reach the pipe butt welding structure to be welded along the air inlet gap, forming back gas protection of the inert gas; the inert gas flows out from the back of the pipe butt welding structure to the groove to be welded, so that the inert gas can be more easily detected, and it is easier to determine whether the welding conditions are met during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 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 any creative work.

[0019] Figure 1 It is a schematic structural diagram of an embodiment of a gas protection device of the present invention.

[0020] Figure 2 Schematic diagram of the structure of the gas outlet structure in the embodiment of the gas protection device of the present invention.

[0021] in:

[0022] 11-air inlet gap, 12-first gap, 2-first sleeve, 21-second gap, 22-connecting through hole, 3-second sleeve, 5-first end plate, 51-air inlet, 52-first connecting through hole, 6-second end plate, 61-second connecting through hole, 62-through groove, 7-fastening surface, 71-pivot pin, 72-fastening pin, 73-connecting arm. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] Example 1

[0026] like Figure 1 , Figure 2 As shown, a gas protection device is used for a pipe butt welding structure, the pipe butt welding structure includes a butt pipe and a rod body arranged in the butt pipe, and an air inlet gap 11 is provided between the outer wall surface of the rod body and the inner wall surface of the butt pipe. The gas protection device includes an air outlet structure for sleeved on one end of the rod body, the air outlet structure is used to form a first gap 12 between the outer wall surface of the rod body, and the first gap 12 is connected with the air inlet gap 11; the air outlet structure is also provided with an air inlet channel for connecting with the first gap 12. Sleeve refers to sleeved on an object, including direct contact and gap. The rod body includes a solid rod or a hollow rod.

[0027] Example 2

[0028] Different from the embodiment 1, the gas outlet structure includes a first sleeve 2 for sleeved on the rod body and a second sleeve 3 sleeved on the first sleeve 2, the inner wall surface of the first sleeve 2 is used to form a first gap 12 with the outer wall surface of the rod body, a second gap 21 is provided between the outer wall surface of the first sleeve 2 and the inner wall surface of the second sleeve 3, and the gas outlet structure also includes a blocking structure for blocking both ends of the second gap 21; a connecting channel is provided on the tube wall of the first sleeve 2, one end of the connecting channel is used to communicate with the first gap 12, and the other end of the connecting channel is connected to the second gap 21; the air inlet channel includes the second gap 21 and the connecting channel, and the air inlet channel also includes an air inlet 51 connected to the second gap 21. The blocking structure blocks both ends of the second gap 21, that is, avoids the inert gas from overflowing along the two ends of the second gap 21, and reduces the waste of inert gas. At this time, the inert gas enters the second gap 21 from the air inlet 51, then enters the first gap 12 through the connecting channel, and then flows along the outer wall of the rod body to the pipe butt welding structure. The second gap 21 can provide a preliminary buffer for the inert gas when it flows in from a gas source such as a compressed gas cylinder, thereby reducing the turbulence of the gas flow in the gas protection device.

[0029] The blocking structure includes a first end plate 5 sleeved on the rod body, and the first end plate 5 is fixedly connected to the end surface of the first sleeve 2 and the end surface of the second sleeve 3 respectively. The fixed connection can be achieved by welding, or by wedging, integral molding, etc. The first end plate 5 is provided with a first connecting through hole 52, and the inner wall surface of the first connecting through hole 52 is used to abut against the outer wall surface of the rod body; the air inlet 51 is provided on the first end plate 5. The abutment can effectively fix the first end plate 5 and the structure fixedly connected thereto, and can also block one end of the first gap 12 and the second gap 21, such as Figure 1 As shown, the inert gas is prevented from being wasted due to overflow from the first gap 12 and the second gap 21. The air inlet 51 can be provided on the first end plate 5 by means of an air inlet nozzle or the like.

[0030] The blocking structure also includes a second end plate 6 for being sleeved on the rod body, and the second end plate 6 is fixedly connected to the end surface of the first sleeve 2 away from the first end plate 5 and the end surface of the second sleeve 3 away from the first end plate 5 respectively. The fixed connection can be achieved by welding, and can also be achieved by wedging, integral molding, etc.; a second connecting through hole 61 is provided on the second end plate 6, and the inner wall surface of the second connecting through hole 61 is used to abut against the outer wall surface of the rod body; at least one through groove 62 is provided on the inner wall surface of the second connecting through hole 61, and one end of the through groove 62 is used to communicate with the first gap 12, and the other end of the through groove 62 extends to the end surface of the second end plate 6 away from the first sleeve 2. This abutment not only effectively fixes the second end plate 6 and the structure fixedly connected thereto, but also blocks one end of the second gap 21. Figure 1As shown, the inert gas is prevented from being wasted by overflowing from this end of the second gap 21. The through groove 62 enables the inert gas to enter the air inlet gap 11 from the first gap 12.

[0031] Example 3

[0032] Different from the second embodiment, at least two through grooves 62 are provided on the inner wall surface of the second connecting through hole 61, and the at least two through grooves 62 are evenly distributed along the circumference of the second connecting through hole 61. At least two through grooves 62 ensure the circumferential uniformity of the inert gas on the outer wall surface of the rod body, so that the pipe butt welding structure can obtain circumferentially uniform back gas protection.

[0033] Example 4

[0034] The difference from the second embodiment is that the air outlet structure is provided with a buckle surface 7, and the air outlet structure is divided into two buckled parts by the buckle surface 7. The first sleeve 2, the second sleeve 3, the first end plate 5, and the second end plate 6 are all divided into two parts extending along the axis direction of the first sleeve 2 by the buckle surface 7. The buckle surface 7 makes the air outlet structure form two detachable halves, such as Figure 2 As shown, the air outlet structure can be detachably mounted on the rod body along the buckling surface, making it easier to install the air outlet structure on the rod body. In this embodiment, the buckling surface 7 is a plane passing through the axis of the first sleeve 2, and the buckling surface 7 divides the first sleeve 2, the second sleeve 3, the first end plate 5, and the second end plate 6 into two halves, and each half of the first sleeve 2, the second sleeve 3, the first end plate 5, and the second end plate 6 maintains a fixed connection relationship, so that the air outlet structure can be detachably buckled on the rod body.

[0035] It also includes a fixing device for keeping the two parts of the air outlet structure buckled together, the fixing device includes a pivoting structure for pivotally connecting the two parts of the air outlet structure buckled together, and the fixing device also includes a snap structure for snapping the two parts of the air outlet structure buckled together.

[0036] The fixing device includes a pivot pin 71 and a locking pin 72 provided on the second sleeve 3; the fixing device also includes a connecting arm 73, one end of the connecting arm 73 is pivotally connected to the pivot pin 71, the other end of the connecting arm 73 is locked on the locking pin 72, and the inner side of the connecting arm 73 abuts against the outer wall of the second sleeve 3. Figure 2 As shown, one half of the second sleeve 3 is fixedly connected to the seat body having the pivot pin 71 and the buckle pin 72, and the other half of the second sleeve 3 is arranged on the inner side of the overall U-shaped connecting arm 73. When the other half of the second sleeve 3 approaches the rod body, it is simultaneously subjected to the force of the overall U-shaped connecting arm 73 in the direction of approaching the rod body and the reaction force of the rod body in the direction of moving away from the rod body, thereby achieving relative fixation with the connecting arm 73. The pivot structure is the cooperation between the connecting arm 73 and the pivot pin 71, and the buckle structure is the cooperation between the buckle pin 72 and the connecting arm 73.

[0037] Example 5

[0038] Different from Example 1, the connecting channel includes at least two groups of connecting hole rows arranged along the circumference of the first sleeve 2, and the connecting hole rows include connecting through holes 22 arranged along the axial direction of the first sleeve 2. The circumferentially arranged connecting hole rows make the inert gas more evenly distributed on the circumference of the rod body when entering the first gap 12 from the second gap 21, so that the pipe butt welding structure can obtain circumferentially uniform back gas protection.

[0039] The distances from all the connecting through holes 22 of two adjacent connecting hole rows to the first end plate 5 have a difference. The difference is as follows: Figure 1 As shown in H, this difference makes the inert gas more evenly distributed in the axial direction of the rod body when entering the first gap 12 from the second gap 21, avoiding the connection holes 22 of the connection hole row being too aligned in the axial direction of the rod body to form a strong uniform gas circulation, thereby making the inert gas flow more smoothly to the pipe butt welding structure.

[0040] Example 6

[0041] like Figure 1 , Figure 2As shown, a gas protection device is used for a pipe butt welding structure, the pipe butt welding structure includes a butt pipe and a rod body arranged in the butt pipe, an air inlet gap 11 is arranged between the outer wall surface of the rod body and the inner wall surface of the butt pipe, the gas protection device includes an air outlet structure for being sleeved on one end of the rod body, the air outlet structure is used to form a first gap 12 with the outer wall surface of the rod body, and the first gap 12 is connected to the air inlet gap 11; the air outlet structure includes a first sleeve 2 for being sleeved on the rod body and a second sleeve 3 sleeved on the first sleeve 2, the inner wall surface of the first sleeve 2 is used to be in contact with the rod body A first gap 12 is formed between the outer wall of the first sleeve 2 and the inner wall of the second sleeve 3, a second gap 21 is provided between the outer wall of the first sleeve 2 and the inner wall of the second sleeve 3, and the air outlet structure also includes a blocking structure for blocking both ends of the second gap 21; a connecting channel is provided on the tube wall of the first sleeve 2, one end of the connecting channel is used to communicate with the first gap 12, and the other end of the connecting channel is used to communicate with the second gap 21; the air outlet structure is also provided with an inlet channel for communicating with the first gap 12, the inlet channel includes the second gap 21 and the connecting channel, and the inlet channel also includes an inlet port 51 communicated with the second gap 21. The blocking structure includes a first end plate 5 sleeved on the rod body, the first end plate 5 is fixedly connected to the end face of the first sleeve 2 and the end face of the second sleeve 3 respectively, and the fixed connection is achieved by welding in this embodiment. A first connecting through hole 52 is provided on the first end plate 5, and the inner wall surface of the first connecting through hole 52 is used to abut against the outer wall surface of the rod body; the inlet port 51 is provided on the first end plate 5, and the inlet port 51 is provided on the inlet nozzle. The blocking structure also includes a second end plate 6 for sleeved on the rod body. The second end plate 6 is fixedly connected to the end surface of the first sleeve 2 away from the first end plate 5 and the end surface of the second sleeve 3 away from the first end plate 5, respectively. In this embodiment, the fixed connection is achieved by welding. A second connecting through hole 61 is provided on the second end plate 6. The inner wall surface of the second connecting through hole 61 is used to abut against the outer wall surface of the rod body. At least one through groove 62 is provided on the inner wall surface of the second connecting through hole 61. One end of the through groove 62 is used to communicate with the first gap 12, and the other end of the through groove 62 extends to the end surface of the second end plate 6 away from the first sleeve 2. Eight through grooves 62 are provided on the inner wall surface of the second connecting through hole 61. The eight through grooves 62 are evenly distributed along the circumference of the second connecting through hole 61. The air outlet structure is provided with a snap-fit ​​surface 7, which is divided into two parts that snap together. The first sleeve 2, the second sleeve 3, the first end plate 5, and the second end plate 6 are all divided into two parts that extend along the axial direction of the first sleeve 2 as a whole by the snap-fit ​​surface 7.

[0042] The gas protection device also includes a fixing device for keeping the two parts of the gas outlet structure locked together, the fixing device includes a pivoting structure for pivotally connecting the two parts of the gas outlet structure, and the fixing device also includes a snap-fit ​​structure for snap-fitting the two parts of the gas outlet structure. The fixing device includes a pivot pin 71 and a snap-fit ​​pin 72 provided on the second sleeve 3; the fixing device also includes a connecting arm 73, one end of the connecting arm 73 is pivotally connected to the pivot pin 71, the other end of the connecting arm 73 is snap-fitted to the snap-fit ​​pin 72, and the inner side of the connecting arm 73 abuts against the outer wall of the second sleeve 3. Figure 2 As shown, half of the second sleeve 3 is fixedly connected to a seat body having a pivot pin 71 and a snap-fit ​​pin 72, and the other half of the second sleeve 3 is arranged on the inner side of a connecting arm 73 which is generally U-shaped. When the other half of the second sleeve 3 approaches the rod body, it is simultaneously subjected to the force of the connecting arm 73 which is generally U-shaped in the direction of approaching the rod body and the reaction force of the rod body in the direction of moving away from the rod body, thereby achieving relative fixation with the connecting arm 73. The pivot structure is the cooperation between the connecting arm 73 and the pivot pin 71, and the snap-fit ​​structure is the cooperation between the snap-fit ​​pin 72 and the connecting arm 73. The connecting channel includes at least two groups of connecting hole columns arranged along the circumference of the first sleeve 2, and the connecting hole columns include connecting through holes 22 arranged along the axial direction of the first sleeve 2. The distances of all the connecting through holes 22 of two adjacent connecting hole columns to the first end plate 5 have a difference, and the difference is as shown in FIG. Figure 1 As shown in H.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A gas protection device for a pipe butt welding structure, the pipe butt welding structure comprising a butt pipe and a rod body arranged in the butt pipe, an air intake gap is provided between the outer wall surface of the rod body and the inner wall surface of the butt pipe, characterized in that: It comprises an air outlet structure for being sleeved on one end of the rod body, the air outlet structure is used to form a first gap with the outer wall surface of the rod body, the first gap is connected with the air inlet gap; the air outlet structure is also provided with an air inlet channel for connecting with the first gap.

2. The gas protection device according to claim 1, characterized in that: The air outlet structure includes a first sleeve for being sleeved on the rod body and a second sleeve for being sleeved on the first sleeve, the inner wall surface of the first sleeve is used to form the first gap with the outer wall surface of the rod body, and a second gap is provided between the outer wall surface of the first sleeve and the inner wall surface of the second sleeve, and the air outlet structure also includes a blocking structure for blocking both ends of the second gap; a connecting channel is provided on the tube wall of the first sleeve, one end of the connecting channel is used to communicate with the first gap, and the other end of the connecting channel is communicated with the second gap; the air inlet channel includes the second gap and the connecting channel, and the air inlet channel also includes an air inlet connected to the second gap.

3. The gas protection device according to claim 2, characterized in that: The blocking structure includes a first end plate sleeved on the rod body, the first end plate being fixedly connected to the end faces of the first sleeve and the second sleeve respectively; a first connecting through hole is provided on the first end plate, the inner wall surface of the first connecting through hole is used to abut against the outer wall surface of the rod body; the air inlet is provided on the first end plate.

4. The gas protection device according to claim 3, characterized in that: The sealing structure also includes a second end plate for being sleeved on the rod body, the second end plate being fixedly connected to the end surface of the first sleeve away from the first end plate and the end surface of the second sleeve away from the first end plate respectively; a second connecting through hole is provided on the second end plate, the inner wall surface of the second connecting through hole is used to abut against the outer wall surface of the rod body; at least one through groove is provided on the inner wall surface of the second connecting through hole, one end of the through groove is used to communicate with the first gap, and the other end of the through groove extends to the end surface of the second end plate away from the first sleeve.

5. The gas protection device according to claim 4, characterized in that: At least two through grooves are provided on the inner wall surface of the second connecting through hole, and the at least two through grooves are evenly distributed along the circumference of the second connecting through hole.

6. The gas protection device according to claim 4, characterized in that: The air outlet structure is provided with a snap-fit ​​surface, and the air outlet structure is divided into two parts that snap together by the snap-fit ​​surface. The first sleeve, the second sleeve, the first end plate, and the second end plate are all divided into two parts that extend along the axial direction of the first sleeve as a whole by the snap-fit ​​surface.

7. The gas protection device according to claim 6, characterized in that: It also includes a fixing device for keeping the two parts of the air outlet structure buckled together, the fixing device includes a pivoting structure for pivotally connecting the two parts of the air outlet structure buckled together, and the fixing device also includes a snap structure for snapping the two parts of the air outlet structure buckled together.

8. The gas protection device according to claim 7, characterized in that: The fixing device includes a pivot pin and a snap-fit ​​pin arranged on the second sleeve; the fixing device also includes a connecting arm, one end of the connecting arm is pivotally connected to the pivot pin, the other end of the connecting arm is snap-fitted to the snap-fit ​​pin, and the inner side of the connecting arm abuts against the outer wall surface of the second sleeve.

9. The gas protection device according to claim 3, characterized in that: The connection channel includes at least two groups of connection hole rows arranged along the circumference of the first sleeve, and the connection hole rows include connection through holes arranged along the axial direction of the first sleeve.

10. The gas protection device according to claim 9, characterized in that: The distances between all the connecting through holes in the two adjacent connecting hole columns and the first end plate have a difference.

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