Titanium heat exchange tube protective gas conveying device

Abstract

The utility model discloses a titanium heat exchange tube protective gas delivery device, which comprises a gas inlet tube used for being connected with a protective gas source and a gas distribution head connected to the outlet end of the gas inlet tube, the gas distribution head comprises an outer ring and an inner ring concentrically arranged on the inner circle of the outer ring, the inner ring is in sliding connection with the outer ring along the axis direction of the outer ring, and the outer ring is connected with the outer ring. An annular channel used for clamping and positioning the titanium heat exchange tube is formed between the surfaces, close to each other, of the inner ring and the outer ring. The sides, close to the annular channel, of the inner ring and the outer ring are provided with gas conveying channels used for conveying protective gas to the surface of the titanium heat exchange tube. According to the utility model, by adjusting the axial position of the inner ring on the outer ring, the gap of the annular channel formed between the inner ring and the outer ring can be changed, so that the titanium heat exchange tubes with different wall thicknesses can be concentrically clamped and fixed, and air is simultaneously supplied to the inside and the outside of the tube wall through the air supply channels arranged on the sides, close to the titanium heat exchange tubes, of the inner ring and the outer ring; and all-around gas protection in the welding process is achieved, and the welding quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger welding, in particular to a titanium heat exchange tube protective gas conveying device. Background Art

[0002] The heat exchange tubes of titanium heat exchangers generally adopt a heat exchange tube structure with a thinner wall thickness. During welding, it is necessary to maintain the stability of the position of the heat exchange tubes and a good welding environment. The existing shielding gas delivery device only protects the inside of the titanium heat exchange tube, and cannot guarantee the protection effect of the weld molten pool and the heat-affected zone, resulting in welding defects and affecting the welding quality. At the same time, due to the thin wall thickness of the titanium heat exchange tube itself, it is not easy to clamp and fix during welding. The conventional clamping and positioning structure will also affect the delivery of the shielding gas during clamping, and it is impossible to provide all-round protection for the heat exchange tube. Utility Model Content

[0003] Technical purpose: In view of the above-mentioned deficiencies in the existing titanium heat exchange tube welding, the utility model discloses a titanium heat exchange tube protective gas delivery device which can effectively position and fix the heat exchange tube and at the same time deliver protective gas for all-round protection.

[0004] Technical solution: To achieve the above technical objectives, the utility model adopts the following technical solution:

[0005] A protective gas delivery device for a titanium heat exchange tube comprises an air inlet pipe connected to a protective gas source and a gas distribution head connected to the outlet end of the air inlet pipe, the gas distribution head comprising an outer ring and an inner ring concentrically arranged on the inner ring of the outer ring, the inner ring being slidably connected to the outer ring along the axial direction of the outer ring, and an annular channel for clamping and positioning the titanium heat exchange tube is formed between the surfaces of the inner ring and the outer ring close to each other, and an air delivery channel for delivering protective gas to the surface of the titanium heat exchange tube is arranged on one side of the inner ring and the outer ring close to the annular channel.

[0006] Preferably, the outer surface of the inner ring of the utility model adopts a tapered structure with a gradually decreasing diameter, and the spacing of the annular channel formed between the inner ring and the outer ring gradually decreases along the axial direction of the outer ring.

[0007] Preferably, the inner ring and the outer ring of the utility model are provided with air delivery grooves on the surface along the axial direction on the side close to the titanium heat exchange tube, the air delivery grooves of the inner ring and the outer ring correspond to each other, and air holes for connecting with the air inlet pipe are provided at the ends of the air delivery grooves of the outer ring. The number of the air holes corresponds to the number of the air delivery grooves on the outer ring, and a ventilation cavity is provided on the outer ring at the circumferential position where the air holes are located, and the air inlet pipe is connected with the ventilation cavity.

[0008] Preferably, the outer ring of the utility model is provided with an expansion joint at one end close to the titanium heat exchange tube, and the overall length of the outer ring is adjusted through the expansion joint.

[0009] Preferably, the telescopic joint of the utility model includes a sleeve that slides axially with the outer ring, a sliding rod is arranged near the end of the sleeve, the outer ring has a sliding groove that cooperates with the sliding rod, a telescopic spring is sleeved on the sliding rod, one end of the telescopic spring is fixedly connected to the sliding rod, and the other end is fixed in the sliding groove.

[0010] Preferably, the outer ring of the utility model is provided with a limit baffle on the outer surface of the slide groove.

[0011] Preferably, the protective gas source of the utility model uses argon with a purity of 99.99.

[0012] Beneficial effects: The titanium heat exchange tube protective gas delivery device provided by the utility model has the following beneficial effects:

[0013] 1. The inner ring of the utility model is slidably connected with the outer ring along the axial direction, and the inner ring adopts a tapered structure with a gradually decreasing diameter. By adjusting the axial position of the inner ring on the outer ring, the gap of the annular channel formed between the inner ring and the outer ring can be changed, thereby realizing the concentric clamping and fixation of titanium heat exchange tubes with different wall thicknesses, and through the air supply channels arranged on the inner ring and the outer ring on the side close to the titanium heat exchange tube, air is simultaneously supplied to the inside and outside of the tube wall, thereby realizing all-round gas protection during the welding process and ensuring the welding quality.

[0014] 2. The gas supply channel of the utility model adopts gas supply grooves arranged on the surfaces of the inner ring and the outer ring. The gas supply grooves are recessed into the surfaces. Even when the titanium heat exchange tube is positioned by the inner ring, the transmission of the protective gas can still be guaranteed to achieve protection of the inner and outer surfaces of the heat exchange tube. At the same time, the airflow of the protective gas can also be used to cool the welding parts.

[0015] 3. The outer ring end of the utility model is provided with an expansion joint. When the titanium heat exchange tube is clamped and positioned, the length of the heat exchange tube extending out of the tube sheet is limited and is easily affected by the size during assembly. The outer ring structure of the utility model can adjust the overall length of the outer ring structure by expansion when it is close to the tube sheet, thereby ensuring the positioning and fixing effect of the titanium heat exchange tube and broadening the scope of use of the equipment.

[0016] 4. The telescopic joint of the utility model can ensure the accuracy of the sliding direction by cooperating with the sleeve through the sliding rod embedded in the sliding groove, thereby avoiding the influence of deflection on the fixed positioning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 For this utility model Figure 1 A partial enlarged view of the middle A area;

[0020] Figure 3 This is the internal structure diagram of the air distribution head of the utility model;

[0021] Among them, 1-inlet pipe, 2-air distribution head, 3-outer ring, 4-inner ring, 5-titanium heat exchange tube, 6-air delivery groove, 7-ventilation hole, 8-ventilation cavity, 9-expansion joint, 10-sleeve, 11-sliding rod, 12-slide groove, 13-expansion spring, 14-limit baffle. DETAILED DESCRIPTION

[0022] The present invention will be described more clearly and completely below by way of a preferred embodiment in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiment.

[0023] like Figure 1-Figure 3 The figure shows a titanium heat exchange tube protective gas delivery device disclosed in the utility model, including an inlet pipe 1 for connecting to a protective gas source and a gas distribution head 2 connected to the outlet end of the inlet pipe 1. The protective gas source preferably uses argon with a purity of 99.99; the gas distribution head 2 includes an outer ring 3 and an inner ring 4 concentrically arranged on the inner ring of the outer ring 3, the inner ring 4 is slidably connected to the outer ring 3 along the axial direction of the outer ring 3, and an annular channel for clamping and positioning the titanium heat exchange tube 5 is formed between the surfaces of the inner ring 4 and the outer ring 3 that are close to each other, and a gas delivery channel for delivering protective gas to the surface of the titanium heat exchange tube 5 is arranged on the side close to the annular channel between the inner ring 4 and the outer ring 3.

[0024] When the titanium heat exchange tube 5 is welded to the tube sheet, the protective gas can flow on the inner and outer surfaces of the heat exchange tube at the same time, providing all-round protection for the pipeline, thereby ensuring the stability of the welding environment during the welding process and ensuring the welding quality.

[0025] In order to keep the titanium heat exchange tube 5 positioned and fixed during the welding process without affecting the delivery of the protective gas, the outer surface of the inner ring 4 of the present invention adopts a tapered structure with a gradually decreasing diameter. The spacing of the annular channel formed between the inner ring 4 and the outer ring 3 gradually decreases along the axial direction of the outer ring 3. The inner ring 4 and the outer ring 3 are provided with air supply grooves 6 axially on the surface on the side close to the titanium heat exchange tube 5. The air supply grooves 6 of the inner ring 4 and the outer ring 3 correspond to each other. At the end of the air supply groove 6 of the outer ring 3, there are air holes 7 for connecting with the air inlet pipe 1. The number of the air holes 7 corresponds to the number of the air supply grooves 6 on the outer ring 3. The outer ring 3 is provided with a ventilation cavity 8 at the circumferential position of the air hole 7, and the air inlet pipe 1 is connected to the ventilation cavity 8.

[0026] The protective gas enters from the ventilation cavity 8 and enters the air delivery groove 6 through the air vent 7, flows along the direction of the air delivery groove, and at the same time protects the inner and outer surfaces of the titanium heat exchange tube 5. Moreover, since the bottom of the air delivery groove 6 is lower than the surface of the corresponding ring body, even when the inner ring 4 is in contact with the inner wall of the titanium heat exchange tube 5 for concentric positioning and fixing, the protective gas can still enter the interior of the titanium heat exchange tube 5 through the air delivery groove 6 on the surface of the inner ring 4.

[0027] In order to meet different welding requirements of titanium heat exchange tube 5, the outer ring 3 of the present invention is provided with an expansion joint 9 at one end close to the titanium heat exchange tube 5, and the overall length of the outer ring 3 is adjusted through the expansion joint 9, thereby improving the use range of the protective gas delivery device.

[0028] Specifically, the telescopic joint 9 of the present invention includes a sleeve 10 that slides axially with the outer ring, a sliding rod 11 is arranged near the end of the sleeve 10 of the outer ring 3, the outer ring 3 is provided with a sliding groove 12 that cooperates with the sliding rod 11, a telescopic spring 13 is sleeved on the sliding rod 11, one end of the telescopic spring 13 is fixedly connected to the sliding rod 11, and the other end is fixed in the sliding groove 12, and the outer ring 3 is provided with a limit baffle 14 on the outer surface of the sliding groove 12 to maintain the stability of the sliding of the sliding rod 11.

[0029] When in use, the titanium heat exchange tube protective gas delivery device provided by the utility model is assembled in the corresponding tube sheet, and the end of the titanium heat exchange tube 5 extends out of the tube sheet surface for a distance so as to be docked with the protective gas delivery device of the utility model. The inner ring 4 is slid along the circumference of the outer ring 3, and the conical structure at the end of the inner ring 4 fits with the inner wall of the titanium heat exchange tube 5, so that the titanium heat exchange tube 5 is concentrically supported and positioned, and the tube wall of the heat exchange tube is kept between the outer ring 3 and the inner ring 4. During welding, the protective gas is first delivered through the air inlet pipe 1 to form protection around the titanium heat exchange tube welding area, and then welding is carried out. After welding is completed, the gas delivery is continued for 3-5 minutes, so as to effectively protect the welding area and ensure the welding quality.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A titanium heat exchange tube protective gas delivery device, characterized in that: The invention comprises an air inlet pipe (1) for connecting to a protective gas source and an air distribution head (2) connected to the outlet end of the air inlet pipe (1); the air distribution head (2) comprises an outer ring (3) and an inner ring (4) arranged concentrically on the inner ring of the outer ring (3); the inner ring (4) is slidably connected to the outer ring (3) along the axial direction of the outer ring (3); an annular channel for clamping and positioning a titanium heat exchange tube (5) is formed between surfaces of the inner ring (4) and the outer ring (3) that are close to each other; and a gas supply channel for supplying protective gas to the surface of the titanium heat exchange tube (5) is provided on one side of the inner ring (4) and the outer ring (3) close to the annular channel.

2. A titanium heat exchange tube protection gas delivery device according to claim 1, characterized in that: The outer surface of the inner ring (4) adopts a tapered structure with a gradually decreasing diameter, and the spacing of the annular channel formed between the inner ring (4) and the outer ring (3) gradually decreases along the axial direction of the outer ring (3).

3. A titanium heat exchange tube protection gas delivery device according to claim 2, characterized in that: The inner ring (4) and the outer ring (3) are provided with air delivery grooves (6) on the surface along the axial direction on the side close to the titanium heat exchange tube (5); the air delivery grooves (6) of the inner ring (4) and the outer ring (3) correspond to each other; air holes (7) for communicating with the air inlet pipe (1) are provided at the ends of the air delivery grooves (6) of the outer ring (3); the number of the air holes (7) corresponds to the number of the air delivery grooves (6) on the outer ring (3); the outer ring (3) is provided with air vents (8) at the circumferential positions of the air holes (7); the air inlet pipe (1) is connected to the air vents (8).

4. The titanium heat exchange tube protection gas delivery device according to claim 1, characterized in that: The outer ring (3) is provided with an expansion joint (9) at one end close to the titanium heat exchange tube (5), and the overall length of the outer ring (3) is adjusted via the expansion joint (9).

5. A titanium heat exchange tube protection gas delivery device according to claim 4, characterized in that: The telescopic joint (9) comprises a sleeve (10) which is axially slidably matched with the outer ring, a sliding rod (11) is arranged near the end of the sleeve (10) near the outer ring (3), the outer ring (3) is provided with a sliding groove (12) which is matched with the sliding rod (11), and a telescopic spring (13) is sleeved on the sliding rod (11), one end of the telescopic spring (13) is fixedly connected to the sliding rod (11), and the other end is fixed in the sliding groove (12).

6. The titanium heat exchange tube protection gas delivery device according to claim 5, characterized in that: The outer ring (3) is provided with a limit baffle (14) on the outer surface of the slide groove (12).

7. The protective gas delivery device for titanium heat exchange tube according to claim 1, characterized in that: The protective gas source uses argon gas with a purity of 99.99.

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