Flow channel pipe of heat exchanger

Abstract

The utility model relates to a heat exchanger runner pipe which comprises an inner pipe and an outer pipe, the inner pipe is provided with a runner groove and an inner pipe welding face, the runner groove comprises an inlet cambered surface groove, a runner groove body part and an outlet cambered surface groove which are communicated in sequence, and the inner pipe welding face is used for laser welding of the inner pipe and the outer pipe; the outer pipe is provided with a fluid inlet, a fluid outlet and an outer pipe welding track; the inlet cambered surface groove corresponds to the fluid inlet, the outlet cambered surface groove corresponds to the fluid outlet, the outer diameter of the inner pipe, the projection diameter of the welding face of the inner pipe on the bottom face of the inner pipe and the inner diameter of the outer pipe correspond, and the welding track of the outer pipe surrounds the flow channel groove to form a sealed fluid channel. The inner pipe welding face of the heat exchanger runner pipe is tightly attached to the inner wall of the outer pipe and is in an up-down spiral shape. The structure is simple, laser welding is conveniently achieved, the overall sealing performance is good, materials are saved, the middle portions of two pipes are welded on the side faces, the welding efficiency is high, and energy is saved.

Description

Technical Field

[0001] The present application relates to a heat exchanger flow channel tube, which is mainly suitable for the design and production of heat exchange tubes of various fluid heat exchangers. Background Art

[0002] The traditional heat exchanger includes an inner tube and an outer tube. The ways to connect the inner tube and the outer tube include vacuum brazing, gas shielded welding, plasma welding, mechanical connection, glue bonding, etc. These connection methods have their own disadvantages. For example, vacuum brazing has low welding efficiency, high power consumption, and high production cost of a single product; gas shielded welding has a large heat affected zone, and deformation is easy to occur during the welding process. Precision components often require additional finishing steps after welding, and the welding environment is poor. The arc generated is more harmful to the human body; mechanical connection cannot achieve a sealed connection between the two components; glue adhesion introduces organic matter, cannot be used in food-grade heat exchange vessels, and has poor high temperature resistance. Summary of the invention

[0003] The technical problem solved by the present application is to overcome the above-mentioned deficiencies in the prior art and to provide a heat exchanger flow channel tube with a simple structure and convenient laser welding.

[0004] The technical solution adopted by the present application to solve the above technical problems includes: a heat exchanger flow channel tube, including an inner tube and an outer tube, characterized in that: the inner tube is provided with a flow channel groove and an inner tube welding surface, the flow channel groove includes an inlet arc surface groove, a flow channel groove main body, and an outlet arc surface groove connected in sequence, and the inner tube welding surface is used for laser welding of the inner tube and the outer tube; the outer tube is provided with a fluid inlet, a fluid outlet, and an outer tube welding track; the inlet arc surface groove corresponds to the fluid inlet, the outlet arc surface groove corresponds to the fluid outlet, the inner tube outer diameter, the inner tube welding surface projection diameter on the inner tube bottom surface, and the outer tube inner diameter correspond, and the outer tube welding track surrounds the flow channel groove to form a sealed fluid channel. Through the above design, the present application enables the inner tube and the outer tube to accurately weld the parts that need to be welded by laser, ensuring that the inner side of the inlet arc surface groove, the outlet arc surface groove, and the flow channel main body are not welded, and a sealed and efficient fluid channel is formed through the flow channel groove, and a separate flow channel tube is not required, saving costs and energy and preventing damage to the product.

[0005] The inner tube welding surface of the heat exchanger flow channel tube of the present application is close to the inner wall of the outer tube in an up and down spiral shape to form a good fit. The laser is irradiated on the outer tube portion corresponding to the inner tube welding surface, so that the corresponding part of the outer tube is laser welded with the inner tube welding surface to form a sealed cavity. The laser welding of the present application adopts the method of irradiating the laser light source perpendicular to the welding surface from the outside of the outer tube to the inner tube, so that the present application can realize laser welding of the mating surfaces of the outer tube and the inner tube that are close to each other from the outside of the outer tube, overcoming the defect that the prior art can usually only laser weld the two ends of the two tubes (the laser light source and the interface between the two tubes can only be parallel or inclined), greatly improving the application scenarios of laser welding.

[0006] The outer tube welding track is composed of an upper circle of the outer tube welding track, an upper arc line of the outer tube welding track, a main body of the outer tube welding track, a lower arc line of the outer tube welding track, and a lower circle of the outer tube welding track. The upper circle of the outer tube welding track corresponds to the upper circle of the inner tube welding surface and is located on its upper side. The upper arc line of the outer tube welding track corresponds to the arc line of the inner tube welding surface and is located on its upper side. The main body of the outer tube welding track is located between the arc line of the inner tube welding surface and the lower arc line of the inner tube welding surface. The lower arc line of the outer tube welding track corresponds to the lower arc line of the inner tube welding surface and is located on its lower side. The lower circle of the outer tube welding track corresponds to the lower circle of the inner tube welding surface and is located on its lower side. The upper circle of the outer tube welding track and the upper arc line of the outer tube welding track are used to seal the upper side of the flow channel groove, the lower arc line of the outer tube welding track and the lower circle of the outer tube welding track are used to close the lower side of the flow channel groove, and the main body of the outer tube welding track is used to close the area between two adjacent sections of the flow channel groove.

[0007] The outer tube welding trajectory is composed of an upper circle of the outer tube welding trajectory, an upper arc line of the outer tube welding trajectory, an outer side line of the outer tube welding trajectory outlet arc surface groove, an outer tube welding trajectory main body, an outer side line of the outer tube welding trajectory inlet arc surface groove, a lower arc line of the outer tube welding trajectory, and a lower circle of the outer tube welding trajectory. The upper circle of the outer tube welding trajectory corresponds to the upper circle of the inner tube welding surface and is located on its upper side, the upper arc line of the outer tube welding trajectory corresponds to the arc line of the inner tube welding surface and is located on its upper side, the main body of the outer tube welding trajectory is located between the arc line of the inner tube welding surface and the lower arc line of the inner tube welding surface, the lower arc line of the outer tube welding trajectory corresponds to the lower arc line of the inner tube welding surface and is located on its lower side, the lower circle of the outer tube welding trajectory corresponds to the lower circle of the inner tube welding surface and is located on its lower side, the outer side line of the outlet arc surface groove of the outer tube welding trajectory corresponds to the outer side of the outlet arc surface groove of the inner tube, and the outer side line of the inlet arc surface groove of the outer tube welding trajectory corresponds to the outer side of the inlet arc surface groove of the inner tube.

[0008] Preferably, the clearance between the inner tube welding surface and the inner wall of the outer tube is no more than 0.5 mm.

[0009] The outer tube wall thickness is preferably in the range of 0.1-10 mm.

[0010] The inner tube is provided with an inner tube marking groove, and the outer tube is provided with an outer tube marking groove, and the inner tube marking groove corresponds to the outer tube marking groove. The inner tube and the outer tube are made of any one of copper, copper alloy, steel, aluminum, and titanium.

[0011] When the air tightness test of the fluid channel described in the present application is performed, when the inflation pressure of the fluid channel is not less than 1 MPa, the pressure is maintained for 1 minute without leakage.

[0012] The flow channel tube structure of the heat exchanger in this application is simple, convenient for laser welding, has good overall sealing, does not require welding materials and separate flow channel tubes, retains the inherent characteristics of the parent material to the maximum extent, realizes side welding of the middle part of the two tubes, has high welding efficiency, and saves energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the inner tube in an embodiment of the present application.

[0014] Figure 2 yes Figure 1 AA cross-sectional view of .

[0015] Figure 3 yes Figure 1 Schematic diagram of the top view.

[0016] Figure 4 It is a three-dimensional schematic diagram of the inner tube in the embodiment of the present application.

[0017] Figure 5 It is a schematic diagram of the structure of the outer tube of an embodiment of the present application.

[0018] Figure 6 yes Figure 5 BB cross-sectional view.

[0019] Figure 7 yes Figure 5 Schematic diagram of the top view.

[0020] Figure 8 It is a three-dimensional schematic diagram of the outer tube of the embodiment of the present application.

[0021] Fig. 9 It is a schematic diagram of the welding trajectory of the outer tube of the embodiment of the present application.

[0022] In the figure: inner tube 1, flow channel groove 11, inlet camber groove 111, outlet camber groove 112, flow channel groove main body 113, inner tube welding surface 12, inner tube welding surface upper circle 121, inner tube welding surface arc line 122, inner tube welding surface lower arc line 123, inner tube welding surface lower circle 124, inner tube marking groove 13, inner tube step 14, outer tube 2, fluid inlet 21, fluid outlet 22, outer tube marking groove 23, outer tube welding track 24, outer tube welding track upper circle 241, outer tube welding track upper arc line 242, outer tube welding track outlet camber groove outer side line 243, outer tube welding track main body (corresponding to the inner tube welding surface) 244, outer tube welding track inlet camber groove outer side line 245, outer tube welding track lower arc line 246, outer tube welding track lower circle 247, outer tube centerline 248, flow channel groove main body width H1, inner tube welding surface width H2. DETAILED DESCRIPTION

[0023] The present application is further described in detail below with reference to the accompanying drawings and examples. The following examples are explanations of the present application and the present application is not limited to the following examples. Figure 3 , Figure 7 The upper and lower distance in .

[0024] See also Figures 1 to 9 The embodiment of the present application mainly includes an inner tube 1 and an outer tube 2. The design feature is that the inner tube 1 is provided with a flow channel groove 11, an inner tube welding surface 12, and an inner tube marking groove 13. The flow channel groove 11 includes an inlet arc surface groove 111, a flow channel groove main body 113, and an outlet arc surface groove 112 which are connected in sequence. After the fluid enters the fluid inlet 21 of the outer tube 2, it passes through the inlet arc surface groove 111, the flow channel groove main body 113, and the outlet arc surface groove 112 and then flows out through the fluid outlet 22 for heat exchange. The inner tube welding surface 12 is used for laser welding of the inner tube 1 and the outer tube 2 (where the laser energy converges); the outer tube 2 is provided with a fluid inlet 21, a fluid outlet 22, and an outer tube marking groove 23; the inner tube marking groove 13 corresponds to and matches the outer tube marking groove 23, and the inlet arc surface groove 111 and The fluid inlet 21 corresponds, the outlet cambered groove 112 corresponds to the fluid outlet 22, the outer diameter L1 of the inner tube 1, the projection diameter of the inner tube welding surface 12 on the bottom surface of the inner tube 1, and the inner diameter of the outer tube 2 are equal or corresponding (a slight deviation is allowed, but the inner tube 1 and the outer tube 2 can be assembled and laser welded); the width H1 of any section of the flow channel groove main body 113 is the same, and the width H2 of any section of the inner tube welding surface 12 is the same, so that when the inner tube marking groove 13 of the inner tube 1 corresponds to the outer tube marking groove 23 of the outer tube 2, the outer tube welding track 24 can be drawn according to the positions of the flow channel groove 11, the inlet cambered groove 111, the outlet cambered groove 112, and the inner tube welding surface 12 of the inner tube 1 (wherein the outer tube welding track main body 244 corresponding to the inner tube welding surface 12 is an area, see Fig. 9 ), the outer tube welding track 24 surrounds the flow channel groove 11 and is in close contact with the corresponding part of the inner tube 1 (referring to the projection on the outer wall of the inner tube 1) to facilitate laser welding. Through the above design, the present application allows the inner tube 1 and the outer tube 2 to accurately weld the parts that need to be welded (the periphery of the flow channel groove 11) by laser, ensuring that the inner sides of the inlet arc groove 111, the outlet arc groove 112, and the flow channel main body 113 are not welded to the outer side welding seal, and a sealed and efficient fluid channel is formed through the flow channel groove 11, without the need for a separate flow channel tube, saving costs and energy and preventing damage to the product.

[0025] The laser welding of the present application adopts a method in which the laser light source is perpendicular to the welding surface (the laser light source is perpendicular to the central axis 248 of the outer tube, and after the outer tube and the inner tube are assembled, the central axis of the inner tube coincides with the central axis of the outer tube) and is performed from the outside of the outer tube 2 to the inner tube 1, so that the present application can realize laser welding of the mating surfaces of the outer tube 2 and the inner tube 1 that are tightly attached to each other from the outside of the outer tube 2, overcoming the defect that the prior art can usually only laser weld the two ends of the two tubes (the laser light source and the interface between the two tubes can only be parallel or inclined), greatly improving the application scenarios of laser welding.

[0026] As a special case, the outer tube welding trajectory 24 includes an outer tube welding trajectory upper circle 241 (corresponding to the upper circle 121 of the inner tube welding surface and located on the upper side thereof), an outer tube welding trajectory upper arc line 242 (corresponding to the arc line 122 of the inner tube welding surface and located on the upper side thereof), an outer tube welding trajectory main body 244 (the part with a width H2 located between the arc line 122 of the inner tube welding surface and the lower arc line 123 of the inner tube welding surface), an outer tube welding trajectory lower arc line 246 (corresponding to the lower arc line 123 of the inner tube welding surface and located on the lower side thereof), and an outer tube welding trajectory lower circle 247 (corresponding to the lower circle 124 of the inner tube welding surface and located on the lower side thereof), wherein the outer tube welding trajectory upper circle 241 and the outer tube welding trajectory upper arc line 242 are used to seal the upper side of the flow channel groove 11, the outer tube welding trajectory lower arc line 246 and the outer tube welding trajectory lower circle 247 are used to close the lower side of the flow channel groove 11, and the outer tube welding trajectory main body 244 is used to close the area between two adjacent sections of the flow channel groove.

[0027] As another special case, the outer tube welding track 24 is composed of an outer tube welding track upper circle 241, an outer tube welding track upper arc line 242, an outer tube welding track outlet arc surface groove outer line 243 (corresponding to the outer side of the outlet arc surface groove 112 of the inner tube 1), an outer tube welding track body 244, an outer tube welding track inlet arc surface groove outer line 245 (corresponding to the outer side of the inlet arc surface groove 111 of the inner tube 1), an outer tube welding track lower arc line 246, and an outer tube welding track lower circle 247. In this case, all outer sides of the flow channel groove 11 (including the outer side of the outlet arc surface groove 112 and the outer side of the inlet arc surface groove 111) are welded, and the sealing safety is particularly good.

[0028] The inner tube 1 and the outer tube 2 of the flow channel tube of the heat exchanger of the present application are processed and formed by internal high pressure, laser cutting, machining and other methods. The inner tube 1 passes through the outer tube 2, and the inner tube welding surface 12 and the outer wall of the inner tube 1 and the corresponding parts of the outer tube welding track 24 are tightly attached to the inner wall of the outer tube 2 in an up and down spiral shape to form a good fit. The laser is irradiated on the outer tube welding track 24, so that the inner tube 1 and the outer tube 2 corresponding to the outer tube welding track 24 are laser welded to form a sealed cavity and a fluid channel formed by the flow channel groove 11 and the corresponding outer tube part.

[0029] The preferred width H2 of the inner tube welding surface 12 (i.e., the distance between a certain point of the lower arc line 123 of the inner tube welding surface and the corresponding upper arc line 122 of the inner tube welding surface, see Figure 3 ) is not less than 0.5mm, with a special case of 0.7mm.

[0030] See also Fig. 9The outer tube welding track body 244 is located between the upper arc line 122 and the lower arc line 123 of the inner tube welding surface. The outer tube welding track body 244 can have a certain distance from the inner tube welding surface arc line 122 and the inner tube welding surface lower arc line 123 in the upper and lower directions. For example, the upper edge of the outer tube welding track body 244 is 0.1 mm away from the upper arc line 122 of the inner tube welding surface, and the lower edge of the outer tube welding track body 244 is 0.1 mm away from the lower arc line 123 of the inner tube welding surface, so as to ensure that the laser welding track 24 does not exceed the range framed by the inner tube welding surface arc line 122 and the inner tube welding surface lower arc line 123. The corresponding upper circle 241 of the outer tube welding trajectory, the upper arc line 242 of the outer tube welding trajectory, the outer line 243 of the outer tube welding trajectory outlet arc groove, the outer line 245 of the outer tube welding trajectory inlet arc groove, and the lower arc line 246 of the outer tube welding trajectory can also have a certain outward distance from the upper circle 121 of the inner tube welding surface, the arc line 122 of the inner tube welding surface, the outer side of the outlet arc groove 112, the outer side of the inlet arc groove 111, the lower arc line 123 of the inner tube welding surface, and the lower circle 124 of the inner tube welding surface.

[0031] Preferably, the clearance between the inner tube welding surface 12 and the inner wall of the outer tube 2 is no greater than 0.5 mm.

[0032] A method for manufacturing the flow channel tube of the heat exchanger of the present application is as follows:

[0033] S1: The inner tube 1 and the outer tube 2 are respectively made by machining, high-pressure tube expansion and laser cutting;

[0034] S2: Draw an outer tube welding track 24 on the outer side of the outer tube 2 according to the parameters of the inner tube welding surface 12 of the inner tube 1 (consisting only of an outer tube welding track upper circle 241, an outer tube welding track upper arc line 242, an outer tube welding track body 244, an outer tube welding track lower arc line 246, and an outer tube welding track lower circle 247);

[0035] S3: The inner tube 1 is sleeved inside the outer tube 2, and the inner tube marking groove 13 is aligned with the outer tube marking groove 23;

[0036] S4: The upper part of the inner tube 1 is laser welded to the corresponding part of the upper part of the outer tube 2 (in particular, the upper circle 241 of the outer tube welding track), and the lower part of the inner tube 1 is laser welded to the corresponding part of the lower part of the outer tube 2 (in particular, the lower circle 247 of the outer tube welding track), so that the inner tube 1 and the outer tube 2 form a sealed whole;

[0037] S5: The laser irradiates the upper side of the upper arc line 242 of the outer tube welding track, the main body 244 of the outer tube welding track, and the lower side of the lower arc line 246 of the outer tube welding track to complete the laser welding of the outer tube welding track 24 and the inner tube 1.

[0038] Another method for making the flow channel tube of the heat exchanger of the present application is as follows:

[0039] S1: The inner tube 1 and the outer tube 2 are respectively made by machining, high-pressure tube expansion and laser cutting;

[0040] S2: Draw an outer tube welding track 24 on the outer side of the outer tube 2 according to the parameters of the inner tube welding surface 12 of the inner tube 1 (composed of an outer tube welding track upper circle 241, an outer tube welding track upper arc line 242, an outer tube welding track outlet arc surface groove outer line 243, an outer tube welding track body 244, an outer tube welding track inlet arc surface groove outer line 245, an outer tube welding track lower arc line 246, and an outer tube welding track lower circle 247);

[0041] S3: The inner tube 1 is sleeved inside the outer tube 2, and the inner tube marking groove 13 is aligned with the outer tube marking groove 23;

[0042] S4: The upper part of the inner tube 1 is laser welded to the corresponding part of the upper part of the outer tube 2 (in particular, the upper circle 241 of the outer tube welding track), and the lower part of the inner tube 1 is laser welded to the corresponding part of the lower part of the outer tube 2 (in particular, the lower circle 247 of the outer tube welding track), so that the inner tube 1 and the outer tube 2 form a sealed whole;

[0043] S5: The laser irradiates the upper side of the upper arc line 242 of the outer tube welding track, the outer side of the outer line 243 of the outer tube welding track outlet arc groove, the outer tube welding track body 244, the outer side of the outer line 245 of the outer tube welding track inlet arc groove, and the lower side of the lower arc line 246 of the outer tube welding track to complete the laser welding of the outer tube welding track 24 and the inner tube 1.

[0044] The beneficial effect of the present application is that the inner tube 1 and the outer tube 2 can be sealed and connected to form a sealed flow channel 11 through laser self-melting welding without introducing other media, which retains the inherent characteristics of the parent material to the maximum extent, has high welding efficiency and good sealing effect.

Claims

1. A heat exchanger flow tube, comprising an inner tube and an outer tube, characterized in that: The inner tube is provided with a flow channel groove and an inner tube welding surface. The flow channel groove includes an inlet arc surface groove, a flow channel groove main body, and an outlet arc surface groove which are connected in sequence. The inner tube welding surface is used for laser welding of the inner tube and the outer tube. The outer tube is provided with a fluid inlet, a fluid outlet, and an outer tube welding track. The inlet arc surface groove corresponds to the fluid inlet, the outlet arc surface groove corresponds to the fluid outlet, the inner tube outer diameter, the projection diameter of the inner tube welding surface on the bottom surface of the inner tube, and the outer tube inner diameter correspond, and the outer tube welding track surrounds the flow channel groove to form a sealed fluid channel.

2. The heat exchanger flow channel tube according to claim 1, characterized in that: The inner tube welding surface of the heat exchanger flow channel tube is closely attached to the inner wall of the outer tube and is in an up-and-down spiral shape.

3. The heat exchanger flow channel tube according to claim 1, characterized in that: The outer tube welding trajectory is composed of an upper circle of the outer tube welding trajectory, an upper arc line of the outer tube welding trajectory, a main body of the outer tube welding trajectory, a lower arc line of the outer tube welding trajectory, and a lower circle of the outer tube welding trajectory. The upper circle of the outer tube welding trajectory corresponds to the upper circle of the inner tube welding surface and is located on its upper side, the upper arc line of the outer tube welding trajectory corresponds to the arc line of the inner tube welding surface and is located on its upper side, the main body of the outer tube welding trajectory is located between the arc line of the inner tube welding surface and the lower arc line of the inner tube welding surface, the lower arc line of the outer tube welding trajectory corresponds to the lower arc line of the inner tube welding surface and is located on its lower side, and the lower circle of the outer tube welding trajectory corresponds to the lower circle of the inner tube welding surface and is located on its lower side.

4. The heat exchanger flow channel tube according to claim 1, characterized in that: The outer tube welding trajectory is composed of an upper circle of the outer tube welding trajectory, an upper arc line of the outer tube welding trajectory, an outer side line of the outer tube welding trajectory outlet arc surface groove, an outer tube welding trajectory main body, an outer side line of the outer tube welding trajectory inlet arc surface groove, a lower arc line of the outer tube welding trajectory, and a lower circle of the outer tube welding trajectory. The upper circle of the outer tube welding trajectory corresponds to the upper circle of the inner tube welding surface and is located on its upper side, the upper arc line of the outer tube welding trajectory corresponds to the arc line of the inner tube welding surface and is located on its upper side, the main body of the outer tube welding trajectory is located between the arc line of the inner tube welding surface and the lower arc line of the inner tube welding surface, the lower arc line of the outer tube welding trajectory corresponds to the lower arc line of the inner tube welding surface and is located on its lower side, the lower circle of the outer tube welding trajectory corresponds to the lower circle of the inner tube welding surface and is located on its lower side, the outer side line of the outlet arc surface groove of the outer tube welding trajectory corresponds to the outer side of the outlet arc surface groove of the inner tube, and the outer side line of the inlet arc surface groove of the outer tube welding trajectory corresponds to the outer side of the inlet arc surface groove of the inner tube.

5. The heat exchanger flow channel tube according to claim 1, characterized in that: The width of the inner tube welding surface shall not be less than 0.5 mm.

6. The heat exchanger flow tube according to claim 1, characterized in that: The thickness of the outer tube is between 0.1 mm and 10 mm.

7. The heat exchanger flow channel tube according to claim 1, characterized in that: The inner tube is provided with an inner tube marking groove, and the outer tube is provided with an outer tube marking groove, and the inner tube marking groove corresponds to and cooperates with the outer tube marking groove.

8. The heat exchanger flow channel tube according to any one of claims 1 to 7, characterized in that: When the fluid channel is tested for air tightness, the inflation pressure of the fluid channel is not less than 1 MPa, and the pressure is maintained for 1 minute without leakage.

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