Tube expanding and welding positioning device for heat exchanger

Abstract

The application discloses a tube expanding and welding positioning device of a heat exchanger and belongs to the technical field of tube expanding of heat exchangers. The tube expanding and welding positioning device of the heat exchanger comprises a positioning device main body and a push rod; one end of the positioning device main body is provided with a slot for inserting the push rod; the positioning device main body is sleeved with the push rod; the push rod is provided with a smooth section and a threaded section; and the end, away from the slot, of the positioning device main body is provided with a positioning assembly for fixing the position of a heat exchange tube. The slot is arranged on the positioning device main body, the push rod enters the inside of the positioning device main body through the slot, and the positioning assembly is pushed to fix the heat exchange tube, so that the welding precision is not substandard or welding fails due to manual holding of the pipe fitting, and the pipe fitting is wasted.

Description

Technical Field

[0001] This application relates to a tube expansion welding positioning device for a heat exchanger, belonging to the field of heat exchanger tube expansion. Background Technology

[0002] In the fields of oil refining, chemical engineering, metallurgy, and food processing, heat exchangers are widely used to recover waste heat for reuse or to heat materials. The heat exchanger tubes and tube sheets of most heat exchangers employ a welded structure with high connection strength and good sealing performance.

[0003] When performing deep-hole welding of heat exchanger tubes, the heat exchanger tube needs to be manually aligned with the countersunk plate of the tube joint, and then held by hand, keeping the hand in the same position to keep the tube relatively stable for outer diameter welding. During this process, the position of the heat exchanger tube and the welding table must remain unchanged, and the operator needs to hold the tube tightly for a long time, which leads to fatigue. In actual operation, the tube is prone to shifting, resulting in welding failure or failure to meet the welding accuracy requirements. Moreover, the failed tubes cannot be reused because their length has already been cut, and they can only be scrapped, resulting in a lot of waste. Summary of the Invention

[0004] To address the aforementioned issues, this application proposes a tube expansion welding positioning device for heat exchangers. By providing a slot on the main body of the positioning device, a push rod can pass through the slot and enter the interior of the positioning device, thereby pushing the positioning component to fix the heat exchange tube. This avoids the waste of tubes caused by manual holding of the tubes, which could result in substandard welding accuracy or welding failure.

[0005] According to one aspect of this application, a tube expansion welding positioning device for a heat exchanger is provided. The device includes a positioning device body and a push rod. One end of the positioning device body is provided with a slot for inserting the push rod. The positioning device body is sleeved with the push rod. The push rod is provided with a smooth section and a threaded section. The end of the positioning device body away from the slot is provided with a positioning component to fix the position of the heat exchange tube.

[0006] Optionally, the positioning component includes a plurality of positioning pieces and a plurality of positioning piece supports, wherein the positioning pieces and the positioning piece supports are connected in a one-to-one correspondence; the positioning pieces are distributed circumferentially along the main body of the positioning device.

[0007] Optionally, the positioning piece has a groove in the middle.

[0008] Optionally, the slot has an internal thread that matches the threaded section of the push rod.

[0009] Optionally, the positioning device body is provided with a forward push rod, a hydraulic oil storage chamber and a positioning column inside, and the hydraulic oil storage chamber is located between the forward push rod and the positioning column.

[0010] Optionally, the positioning post is hollow inside and has several through holes arranged around its circumference.

[0011] Optionally, the positioning plate support post is provided with a first sealing ring at one end near the positioning post; the end of the positioning plate support post with the sealing ring is located in the through hole.

[0012] Optionally, the push rod has a tightening rod at one end near the threaded section; the push rod has a push rod head at one end near the smooth section, and the push rod head is spherical.

[0013] Optionally, a second sealing ring is provided at the end of the forward push rod near the hydraulic oil storage chamber.

[0014] Another aspect of this application provides the application of the above-mentioned tube expansion welding positioning device in heat exchanger tube welding.

[0015] The beneficial effects that this application may produce include, but are not limited to:

[0016] 1. The heat exchanger expansion and welding positioning device provided in this application has a slot on the main body of the positioning device, so that the push rod enters the interior of the main body of the positioning device through the slot, thereby pushing the positioning component to fix the heat exchange tube, avoiding the waste of tubes caused by manual holding of the tubes to fix them, which may result in substandard welding accuracy or welding failure.

[0017] 2. The heat exchanger expansion welding positioning device provided in this application has a plurality of positioning plates and a plurality of positioning plate supports arranged circumferentially along the main body of the positioning device. The positioning plates and the positioning plate supports are fixedly connected. The positioning plates move with the movement of the positioning plate supports. When the positioning plate supports are subjected to an outward force, the positioning plate supports move in all directions, thereby driving the positioning plates to move away from the main body of the positioning device. Thus, the positioning plates fit tightly against the inner wall of the heat exchange tube, thereby fixing the heat exchange tube.

[0018] 3. The expansion tube welding positioning device for the heat exchanger provided in this application has an internal thread inside the slot, which matches the threaded section of the push rod. On the one hand, the push rod can be rotated to move in and out of the slot; on the other hand, the push rod can be fixed to prevent it from slipping out of the slot.

[0019] 4. The heat exchanger tube expansion welding positioning device provided in this application has a forward push rod, a hydraulic oil storage chamber and a positioning column inside the main body of the positioning device. The hydraulic oil storage chamber is located between the forward push rod and the positioning column. The push rod pushes the forward push rod into the hydraulic oil storage chamber. After the hydraulic oil is squeezed, it applies pressure to the positioning column, thereby causing the positioning plate support to move with the positioning plate in the surrounding direction, so that the heat exchange tube to be welded remains in a squeezed state and remains unchanged in a fixed position, which is convenient for welding personnel to operate.

[0020] 5. The expansion tube welding positioning device for the heat exchanger provided in this application has a screwing rod at one end of the push rod near the threaded section, which allows the worker to rotate the push rod by rotating the screwing rod, thereby making the push rod move in the slot and saving manpower; the push rod has a push rod head at one end of the push rod near the smooth section, and the push rod head is spherical, so as to push the forward push rod to move. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a front view schematic diagram of the main body of the positioning device of the tube expansion welding positioning device of the heat exchanger involved in the embodiments of this application;

[0023] Figure 2 This is a front cross-sectional view of the main body of the positioning device of the tube expansion welding positioning device of the heat exchanger involved in the embodiments of this application;

[0024] Figure 3 This is a front view schematic diagram of the push rod of the tube expansion welding positioning device for the heat exchanger involved in the embodiments of this application;

[0025] Figure 4 This is a schematic left-side cross-sectional view of the main body of the positioning device of the tube expansion welding positioning device of the heat exchanger involved in the embodiments of this application.

[0026] List of components and reference numerals:

[0027] 1. Positioning device body; 2. Push rod head; 3. Smooth section; 4. Threaded section; 5. Positioning plate; 6. Positioning plate support; 7. Groove; 8. Slot; 9. Forward push rod; 10. Hydraulic oil storage chamber; 11. Positioning pin; 12. Through hole; 13. First sealing ring; 14. Tightening rod; 15. Second sealing ring. Detailed Implementation

[0028] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0029] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0031] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0035] refer to Figures 1-4The present application discloses an expansion tube welding positioning device for a heat exchanger. The device includes a positioning device body 1 and a push rod. One end of the positioning device body 1 is provided with a slot 8 for inserting the push rod. The positioning device body 1 is sleeved with the push rod. The push rod is provided with a smooth section 3 and a threaded section 4. The end of the positioning device body 1 away from the slot 8 is provided with a positioning component to fix the position of the heat exchange tube.

[0036] Specifically, by providing a slot 8 on the main body 1 of the positioning device, the push rod enters the interior of the main body 1 of the positioning device through the slot 8, thereby pushing the positioning component to fix the heat exchange tube, avoiding the waste of tubes caused by manual holding of the tubes to fix them, which would result in substandard welding accuracy or welding failure.

[0037] In one implementation, the positioning component includes a plurality of positioning pieces 5 and a plurality of positioning piece supports 6, with the positioning pieces 5 and the positioning piece supports 6 connected in a one-to-one correspondence; the positioning pieces 5 are distributed circumferentially along the main body 1 of the positioning device.

[0038] Specifically, the positioning piece 5 and the positioning piece support 6 are fixedly connected. The positioning piece 5 moves with the movement of the positioning piece support 6. When the positioning piece support 6 is subjected to an outward force, the positioning piece support 6 moves in all directions, thereby driving the positioning piece 5 to move away from the main body 1 of the positioning device. As a result, the positioning piece 5 fits tightly against the inner wall of the heat exchange tube, thus fixing the heat exchange tube.

[0039] Specifically, this application does not limit the number of positioning pieces 5 and positioning piece supports 6, and those skilled in the art can choose according to the actual situation.

[0040] Specifically, this application does not limit the connection method between the positioning piece 5 and the positioning piece support 6, and those skilled in the art can make the selection according to the actual situation.

[0041] Specifically, this application does not limit the size and shape of the positioning piece 5, and those skilled in the art can make the selection according to the actual situation.

[0042] Specifically, the positioning piece 5 and the positioning piece support 6 are welded together.

[0043] As one implementation method, the positioning piece 5 has a groove 7 in the middle.

[0044] Specifically, this application does not impose specific limitations on the shape of the groove 7, and those skilled in the art can choose according to the actual situation.

[0045] Specifically, by setting the groove 7, it is possible to prevent the outer circle of the heat exchange tube from being integrated with the device after welding, making it easier to remove the device from the heat exchange tube after operation.

[0046] In one implementation, the slot 8 has an internal thread that matches the threaded section 4 of the push rod.

[0047] Specifically, the slot 8 has an internal thread that matches the threaded section of the push rod. On the one hand, the push rod can be rotated to move in and out of the slot 8; on the other hand, the push rod can be fixed to prevent it from slipping out of the slot 8.

[0048] In one embodiment, the main body 1 of the positioning device is provided with a forward push rod 9, a hydraulic oil storage cavity 10 and a positioning column 11, with the hydraulic oil storage cavity 10 located between the forward push rod 9 and the positioning column 11.

[0049] Specifically, the push rod pushes the forward push rod 9 into the hydraulic oil storage chamber 10. After the hydraulic oil is squeezed, it applies pressure to the positioning column 11, thereby causing the positioning plate support column 6 to move with the positioning plate 5 in the surrounding direction, so that the heat exchange tube to be welded remains in a squeezed state in a fixed position, which is convenient for welding personnel to operate.

[0050] Specifically, those skilled in the art do not impose specific limitations on the shape of the positioning post 11; they may choose according to the actual situation.

[0051] In one embodiment, the positioning post 11 is hollow inside, and a number of through holes 12 are provided on the positioning post 11, with the through holes 12 arranged around the circumference of the positioning post 11.

[0052] Specifically, the hydraulic oil is squeezed and enters the interior of the positioning column 11. Since the positioning plate support column 6 passes through the through hole 12, the hydraulic oil squeezes the positioning plate support column 6 to move in all directions, thereby driving the positioning plate 5 to move in all directions and closely adhere to the inner wall of the heat exchange tube.

[0053] In one embodiment, the positioning support column 6 is provided with a first sealing ring 13 at one end near the positioning post 11; the end of the positioning support column 6 with the sealing ring is located in the through hole 12.

[0054] Specifically, the first sealing ring 13 is set close to the inner wall of the positioning post 11. On the one hand, it can improve the sealing between the positioning plate support 6 and the positioning post 11; on the other hand, the setting of the first sealing ring 13 can reduce the friction between the positioning plate support 6 and the positioning post 11, making the movement of the positioning plate support 6 smoother.

[0055] Specifically, the first sealing ring 13 is made of rubber.

[0056] In one embodiment, a screwing rod 14 is provided at one end of the push rod near the threaded section 4; a push rod head 2 is provided at one end of the push rod near the smooth section 3, and the push rod head 2 is spherical.

[0057] Specifically, this application does not impose specific limitations on the connection method between the torque lever 14 and the push rod; those skilled in the art can choose according to the actual situation.

[0058] Specifically, a screw rod 14 is provided at one end of the push rod near the threaded section 4, which allows the worker to rotate the push rod by rotating the screw rod 14, thereby making the push rod move in the slot 8 and saving manpower; a push rod head 2 is provided at one end of the push rod near the smooth section 3, and the push rod head 2 is spherical, so as to push the forward push rod 9 to move.

[0059] In one embodiment, a second sealing ring 15 is provided at the end of the forward push rod 9 near the hydraulic oil storage chamber 10.

[0060] Specifically, the second sealing ring 15 ensures a good seal between the forward push rod 9 and the main body 1 of the positioning device, preventing the hydraulic oil in the hydraulic oil storage cavity 10 from leaking out towards the threaded section 4, so that when the forward push rod 9 moves forward, the hydraulic oil is squeezed and can apply pressure to the positioning column 11.

[0061] The workflow of this application is as follows: When using this device, first rotate the push rod out of the slot 8, causing the positioning piece 5 to retract to its lowest position. Place the main body 1 of the positioning device into the welded heat exchange tube, so that the positioning piece 5 is positioned at the joint of the heat exchange tube. Insert the push rod into the slot 8, rotate the torque rod 14 to make the push rod enter the slot 8. The push rod head 2 pushes the forward push rod 9 towards the positioning assembly end. The forward push rod 9 squeezes the hydraulic oil in the hydraulic oil storage chamber 10. The squeezed hydraulic oil gives a certain pressure to the positioning column 11, thereby causing the positioning piece support column 6 to be subjected to pressure in all directions, thus fixing the positioning piece. The positioning support 6 has a certain displacement from the center outwards, which causes the positioning piece 5 to move and fit tightly against the inner wall of the heat exchange tube. This keeps the heat exchange tube to be welded in a compressed state and in a fixed position, making it convenient for welding personnel to operate. After welding is completed, the tightening rod 14 is rotated, causing the tightening rod 14 to exit the slot 8, the forward push rod 9 to retract, and the hydraulic oil to exit the positioning column 11. The positioning support 6 is no longer under the pressure of the hydraulic oil, and the positioning piece 5 retracts with the positioning support 6 to the lowest position. Then, the positioning device body 1 is removed from the heat exchange tube, and the operation of the next heat exchange tube is carried out.

[0062] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0063] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A tube expansion welding positioning device for a heat exchanger, characterized in that, The device includes a positioning device body and a push rod; one end of the positioning device body is provided with a slot for inserting the push rod; the positioning device body is sleeved with the push rod; the push rod is provided with a smooth section and a threaded section; the end of the positioning device body away from the slot is provided with a positioning component to fix the position of the heat exchange tube. The positioning device has a forward push rod, a hydraulic oil storage chamber and a positioning column inside its main body, and the hydraulic oil storage chamber is located between the forward push rod and the positioning column. The push rod pushes the forward push rod; The positioning post is hollow inside and has several through holes arranged around the circumference of the positioning post. The through hole connects to the positioning component; The slot has internal threads that match the threaded section of the push rod.

2. The tube expansion welding positioning device for a heat exchanger according to claim 1, characterized in that, The positioning component includes several positioning pieces and several positioning piece supports, with each positioning piece and each positioning piece support being connected in a one-to-one correspondence; the positioning pieces are distributed circumferentially along the main body of the positioning device.

3. The tube expansion welding positioning device for a heat exchanger according to claim 2, characterized in that, The positioning piece has a groove in the middle.

4. The tube expansion welding positioning device for a heat exchanger according to claim 2, characterized in that, The positioning plate support is provided with a first sealing ring at one end near the positioning post; the end of the positioning plate support with the sealing ring is located in the through hole.

5. The tube expansion welding positioning device for a heat exchanger according to claim 1, characterized in that, The push rod has a tightening rod at one end near the threaded section; the push rod has a push rod head at one end near the smooth section, and the push rod head is spherical.

6. The tube expansion welding positioning device for a heat exchanger according to claim 1, characterized in that, The end of the forward push rod near the hydraulic oil storage chamber is provided with a second sealing ring.

7. The application of the tube expansion welding positioning device of any one of claims 1 to 6 in the welding of heat exchange tubes.

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