Heat exchanger pipe fitting clamping device

Abstract

The invention discloses a heat exchanger pipe fitting clamping device which comprises an expansion pipe capable of being provided with a plurality of heat exchanger units to be welded in a penetrating mode, a mandrel capable of moving in the axial direction is arranged in the expansion pipe, a movable limiting assembly is correspondingly arranged at the position, at each heat exchanger unit, of the expansion pipe, and the limiting assemblies partially inwards penetrate through the pipe wall of the expansion pipe. The mandrel is provided with a plurality of conical parts matched with the limiting assemblies, and when the mandrel moves, the conical parts gradually extrude and push the limiting assemblies to move towards the outer portion of the pipe wall so as to abut against the inner wall of the heat exchanger unit. The device has the advantages of simple structure, good welding quality, high welding efficiency, wide adaptability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of clamps, and in particular to a heat exchanger pipe clamping device. Background Art

[0002] With the increase of industrial demand and the advancement of technology, the heat exchanger industry has developed various types of pipe fixtures to clamp various heat exchangers for docking, welding and other processes. The current heat exchanger fixtures mostly clamp the outer surface of the heat exchanger to restrain the heat exchanger. The heat exchanger fixtures currently used in the market have the following shortcomings:

[0003] 1. When the heat exchanger fixture clamps the outer surface of the heat exchanger pipe, interference will occur during the butt welding of the heat exchanger unit, greatly reducing the welding efficiency.

[0004] 2. When the heat exchanger fixture clamps the outer surface of the heat exchanger pipe, the alignment accuracy is not high, and when the clamping force is too large, it is easy to cause damage to the heat exchanger body.

[0005] 3. The heat exchanger clamp has poor adaptability. The same clamp cannot be used for heat exchangers with different pipe diameters, resulting in increased production costs and low work efficiency. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a heat exchanger pipe clamping device with simple structure, good welding quality, high welding efficiency and wide adaptability.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A heat exchanger pipe clamping device includes an expansion tube that can be penetrated by multiple heat exchanger units to be welded, a core shaft that can move axially is provided in the expansion tube, a movable limit assembly is correspondingly provided on the expansion tube at the position of each heat exchanger unit, the limit assembly partially passes through the tube wall of the expansion tube inwardly, and the core shaft is provided with multiple tapered parts that cooperate with the limit assembly, so that when the core shaft moves, the tapered parts are gradually squeezed and push the limit assembly to move outward from the tube wall to press against the inner wall of the heat exchanger unit.

[0009] As a further improvement of the above technical solution:

[0010] Each of the limiter assemblies comprises a plurality of sliders spaced apart along the circumference of the expansion tube, wherein the sliders are movably arranged on the tube wall of the expansion tube, and when the core shaft drives the conical portion to move, the conical portion and the bottom of the slider abut against each other, so as to gradually push the slider outward to abut against the inner wall of the heat exchanger unit.

[0011] A detachable expansion block is provided on the top of the sliding block to adapt to heat exchanger units with different pipe diameters.

[0012] The bottom surface of the sliding block is an inclined surface, which is used to match the conical surface of the conical part.

[0013] Each of the limiting components comprises an elastic limiting member, and a plurality of the sliding blocks are limitedly mounted on the expansion tube by the elastic limiting member and are used to reset the sliding blocks under the elastic action when the core shaft is reset.

[0014] The elastic limiting member is a circle of annular spring, and each of the sliders is provided with a limiting groove for embedding the annular spring, which is used to limit the positioning of the multiple sliders on the expansion tube.

[0015] A plurality of cone sleeves are sleeved on the core shaft to form a plurality of cone-shaped parts, and a spacer sleeve is sleeved between two adjacent cone sleeves.

[0016] A stopper is provided at one end of the expansion tube, and a detachably mounted tightening sleeve is provided at the other end, which is used to tighten a plurality of heat exchanger units after installation to achieve axial positioning.

[0017] A bushing assembly is provided at the end of the expansion tube. The bushing assembly comprises an inner bushing and an oil-free bushing which are sleeved and matched. The oil-free bushing is fixed at the port of the expansion tube, and the inner bushing is passed through the core shaft.

[0018] The heat exchanger pipe clamping device is also provided with a driving member for driving the core shaft to move axially, and the driving member is connected with the core shaft extending out of the expansion tube through a joint.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] 1. A heat exchanger pipe clamping device disclosed in the present invention, by setting special matching expansion tubes, core shafts and limit components, multiple heat exchanger units to be welded are subjected to a clamping force from the inside to the outside, thereby achieving radial limit fixation, facilitating the welding robot to weld the outer walls of multiple heat exchanger units, avoiding interference caused by fixture butt welding, and greatly improving welding accuracy and welding work efficiency.

[0021] 2. The present invention discloses a heat exchanger pipe clamping device, which has a core shaft that moves inside the expansion tube and a tapered portion on the core shaft to push the limiting component to press against the heat exchanger unit from the inner wall. This pressing and limiting method can effectively avoid excessive clamping force and greatly reduce damage to the heat exchanger unit.

[0022] 3. A heat exchanger pipe clamping device disclosed in the present invention realizes stepless adjustment by setting a tapered portion to gradually push the limit assembly to move, so that the heat exchanger pipe clamping device can be applied to heat exchanger units with various pipe diameters, with strong versatility and wide adaptability.

[0023] 4. A heat exchanger pipe clamping device disclosed in the present invention provides sliding blocks at circumferential intervals on the expansion tube, so as to provide uniform thrust to the inner wall of the heat exchanger unit for tightening, thereby avoiding applying force to only a single part to cause damage to the heat exchanger unit.

[0024] 5. A heat exchanger pipe clamping device disclosed in the present invention can be applied to heat exchanger units with various pipe diameters by installing an expansion block with a certain height on the top of a sliding block, and has strong versatility and wide adaptability.

[0025] 6. A heat exchanger pipe clamping device disclosed in the present invention has a matching design of an inclined surface and a conical surface, so that the movement of the slider pushed by the conical part is smoother and faster, and the stability of the device is greatly improved.

[0026] VII. A heat exchanger pipe clamping device disclosed in the present invention is provided with an elastic limiter. On the one hand, when the mandrel moves to the initial position, the elastic force of the elastic limiter drives the slider to move toward the mandrel and restore to the initial position, thereby releasing the radial limit of the heat exchanger unit. On the other hand, the elastic limiter limits the slider to be installed on the expansion tube to prevent the slider from falling.

[0027] 8. A heat exchanger pipe clamping device disclosed in the present invention sets a circle of annular spring embedded in the limit groove of the slider to limit the position of multiple sliders on the expansion tube, so that the multiple sliders of the limit assembly move synchronously, improve the reliability of the device, and make installation and maintenance more convenient.

[0028] 9. A heat exchanger pipe clamping device disclosed in the present invention forms a tapered portion by setting a tapered sleeve on the core shaft, which is convenient for processing the core shaft and for later maintenance and replacement of the device. The tapered sleeve and the limit assembly are set correspondingly by setting a spacer sleeve, so that a single limit assembly abuts against a single heat exchanger unit to adapt to the width of the heat exchanger unit.

[0029] 10. A heat exchanger pipe clamping device disclosed in the present invention has a stopper at one end of the expansion tube, which cooperates with a tightening sleeve at the other end to tighten multiple heat exchanger units to be welded, thereby axially positioning the heat exchanger units and preventing axial movement of the heat exchanger units from affecting welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a three-dimensional principle schematic diagram of a heat exchanger pipe clamping device.

[0031] Figure 2 The present invention is a schematic diagram of the structural principle of a heat exchanger pipe clamping device.

[0032] Figure 3 for Figure 2 Schematic diagram of the structural cross-section at AA.

[0033] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at B.

[0034] Figure 5 The present invention is a schematic diagram of the structural principle of a heat exchanger pipe clamping device and a heat exchanger unit.

[0035] Figure 6 for Figure 5 Schematic diagram of the structural cross-section at CC.

[0036] The numbers in the figure represent: 1. heat exchanger unit; 2. expansion tube; 21. stopper; 22. tightening sleeve; 3. core shaft; 31. tapered portion; 32. joint; 33. spacer; 4. limit assembly; 41. slider; 42. expansion block; 43. elastic limit member; 5. bushing assembly; 51. inner bushing; 52. oil-free bushing; 6. driving member. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] like Figures 1 to 6As shown, the heat exchanger pipe clamping device of this embodiment includes an expansion tube 2 that can be penetrated by multiple heat exchanger units 1 to be welded, and a core shaft 3 that can move in the axial direction is provided in the expansion tube 2. A movable stopper assembly 4 is correspondingly provided at the position of each heat exchanger unit 1 on the expansion tube 2, and the stopper assembly 4 partially passes through the tube wall of the expansion tube 2 inwardly, that is: a plurality of through-hole portions are opened on the expansion tube 2, and each stopper assembly 4 is correspondingly provided at each through-hole portion, and one end of the stopper assembly 4 extends into the expansion tube 2 for matching with the tapered portion 31; the other end extends outward from the expansion tube 2 for pressing against the heat exchanger unit 1. The core shaft 3 is provided with a plurality of tapered portions 31 that match with the stopper assembly 4, so that when the core shaft 3 moves, the tapered portions 31 are gradually squeezed and push the stopper assembly 4 to move outward from the tube wall to press against the inner wall of the heat exchanger unit 1.

[0042] The specific implementation principles are as follows:

[0043] When the heat exchanger pipe clamping device is used, first, a plurality of heat exchanger units 1 to be welded are sleeved on the outer wall of the expansion tube 2. Then, the core shaft 3 in the expansion tube 2 is pulled to move axially. Since a portion of each movable limiting component 4 passes through the tube wall of the expansion tube 2 inward, the tapered portion 31 on the movable core shaft 3 will inevitably gradually squeeze and push the limiting component 4 to move outward from the tube wall. And finally, each limiting component 4 is pressed against the corresponding heat exchanger unit 1. That is, the plurality of heat exchanger units 1 to be welded are subjected to a pressing force from the inside to the outside, and radial limiting fixation is achieved, which facilitates the welding robot to perform welding operations on the outer walls of the plurality of heat exchanger units 1, avoids interference caused by the butt welding of the fixture, and greatly improves the welding accuracy and welding work efficiency. At the same time, by setting the core shaft 3 to move axially in the expansion tube 2, the tapered portion 31 on the core shaft 3 gradually pushes the limiting component 4 to move outward to press against the inner wall of the heat exchanger unit 1. The driving method is simple and reliable, and radial limiting of the heat exchanger unit 1 can be achieved by only moving the core shaft 3. The conical portion 31 is provided to gradually push the limiting assembly 4 to move to achieve stepless adjustment, so that the heat exchanger pipe clamping device can be applied to heat exchanger units 1 of various sizes, and has strong versatility.

[0044] Through the above special scientific design, the heat exchanger pipe clamping device has the following advantages:

[0045] 1. The heat exchanger pipe clamping device of the present invention completely subverts the design of clamping the outside of the heat exchanger from the outside in the prior art. Instead, by setting special matching expansion tubes 2, core shafts 3 and limit components 4, multiple heat exchanger units 1 to be welded are subjected to a clamping force from the inside to the outside, achieving radial limit fixation, facilitating the welding robot to weld the outer walls of multiple heat exchanger units 1, avoiding interference caused by fixture butt welding, and greatly improving welding accuracy and welding work efficiency.

[0046] 2. The heat exchanger pipe clamping device of the present invention is provided with a core shaft 3 that moves in the expansion tube 2, and a tapered portion 31 is provided on the core shaft 3 to push the limiting component 4 to press against the heat exchanger unit 1 from the inner wall. This pressing and limiting method can effectively avoid excessive clamping force and greatly reduce damage to the heat exchanger unit 1.

[0047] 3. The heat exchanger pipe clamping device of the present invention realizes stepless adjustment by setting the tapered portion 31 to gradually push the limit assembly 4 to move, so that the heat exchanger pipe clamping device can be applied to heat exchanger units 1 with various pipe diameters, and has strong versatility and wide adaptability.

[0048] like Figures 1 to 6 As shown, in this embodiment, each stopper assembly 4 includes a plurality of sliders 41 arranged at intervals along the circumference of the expansion tube 2, and the sliders 41 are movably arranged on the tube wall of the expansion tube 2. When the core shaft 3 drives the tapered portion 31 to move, the tapered portion 31 and the bottom of the slider 41 abut against each other, and are used to gradually push the slider 41 outward to press against the inner wall of the heat exchanger unit 1. Preferably, the sliders 41 are evenly spaced along the circumference of the expansion tube 2, so that thrust can be evenly provided to the inner wall of the heat exchanger unit 1 to press against it, so as to avoid applying force to only a single part to cause damage to the heat exchanger unit 1.

[0049] like Figures 1 to 6 As shown, in this embodiment, a detachable expansion block 42 is provided on the top of the slider 41 to adapt to heat exchanger units 1 of different pipe diameters. For example, when the pipe diameter of the next batch of heat exchanger units 1 is larger, an expansion block 42 with a certain height can be installed on the top of the slider 41, so that it can still press against the inner wall of the heat exchanger unit 1 with a larger pipe diameter. This makes the heat exchanger pipe clamping device of the present invention applicable to a variety of heat exchanger units 1 with different pipe diameters, with strong versatility and wide adaptability.

[0050] like Figure 3 and Figure 4 As shown, in this embodiment, the bottom surface of the slider 41 is an inclined surface, which is used to cooperate with the conical surface of the conical portion 31. The matching design of the inclined surface and the conical surface makes the conical portion 31 push the slider 41 to move more smoothly and quickly, and also greatly improves the stability of the device.

[0051] like Figures 1 to 6As shown, in this embodiment, each limiting assembly 4 includes an elastic limiting member 43 (such as a spring, a spring, etc.), and a plurality of sliders 41 are limitedly installed on the expansion tube 2 through the elastic limiting member 43 and are used to reset the sliders 41 under the elastic action when the core shaft 3 is reset. By setting the elastic limiting member 43, on the one hand, when the core shaft 3 moves to the initial position, the elastic force of the elastic limiting member 43 drives the slider 41 to move toward the core shaft 3 and return to the initial position, thereby releasing the radial limit of the heat exchanger unit 1. On the other hand, the elastic limiting member 43 limits the slider 41 to be installed on the expansion tube 2 to prevent the slider 41 from falling.

[0052] like Figures 1 to 6 As shown, in this embodiment, the elastic limiting member 43 is a ring spring, and each slider 41 is provided with a limiting groove for embedding the ring spring, which is used to limit the plurality of sliders 41 around the expansion tube 2. By arranging a ring spring embedded in the limiting groove of the slider 41 to limit the plurality of sliders 41 around the expansion tube 2, the plurality of sliders 41 of the limiting assembly 4 move synchronously, thereby improving the reliability of the device and making installation and maintenance more convenient.

[0053] like Figures 3 to 6 As shown, in this embodiment, a plurality of tapered sleeves are sleeved on the core shaft 3 to form a plurality of tapered portions 31, and a spacer sleeve 33 is sleeved between two adjacent tapered sleeves. By arranging the tapered sleeve to be sleeved on the core shaft 3 to form the tapered portion 31, it is convenient to process the core shaft 3, and it is also convenient to overhaul and replace the device later. By arranging the spacer sleeve 33, the tapered sleeve and the limit assembly 4 are arranged correspondingly, so that a single limit assembly 4 corresponds to a single heat exchanger unit 1 to adapt to the width of the heat exchanger unit 1. It should be particularly noted that in other embodiments, the shape of the tapered portion 31 can also be a tapered sleeve integrally formed with the core shaft 3, a tapered block fixed to the core shaft 3 by gluing or welding, etc., and various simple deformations of the tapered portion 31 should all fall within the protection scope of the present invention.

[0054] like Figures 1 to 6 As shown, in this embodiment, a stopper 21 is provided at one end of the expansion tube 2, and a detachably mounted tightening sleeve 22 is provided at the other end, which is used to tighten the multiple heat exchanger units 1 after installation to achieve axial positioning. The stopper 21 provided at one end of the expansion tube 2 cooperates with the tightening sleeve 22 at the other end to tighten the multiple heat exchanger units 1 to be welded, and the heat exchanger units 1 are axially positioned to prevent the axial movement of the heat exchanger units 1 from affecting the welding quality.

[0055] like Figure 6As shown, in this embodiment, a bushing assembly 5 is provided at the end of the expansion tube 2, and the bushing assembly 5 includes an inner bushing 51 and an oil-free bushing 52 that are sleeved together. The oil-free bushing 52 is fixed at the end of the expansion tube 2, and the inner bushing 51 is passed through the core shaft 3. By arranging the bushing assembly 5 between the expansion tube 2 and the core shaft 3, the friction between the expansion tube 2 and the core shaft 3 is reduced, and the service life of the device is extended.

[0056] like Figures 1 to 6 As shown, in this embodiment, the heat exchanger pipe clamping device is further provided with a driving member 6 (such as a motor, a cylinder, etc.) for driving the core shaft 3 to move axially, and the driving member 6 is connected to the core shaft 3 extending out of the expansion tube 2 through a joint 32. By providing a mobile driving member 6 to drive the core shaft 3 to move axially, the automation degree of the device is improved and the labor cost is reduced.

[0057] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A heat exchanger pipe clamping device, characterized in that: The invention comprises an expansion tube (2) through which a plurality of heat exchanger units (1) to be welded can be inserted, a core shaft (3) which can be moved axially is arranged inside the expansion tube (2), a movable stopper assembly (4) is arranged on the expansion tube (2) at the position of each heat exchanger unit (1), the stopper assembly (4) partially passes through the tube wall of the expansion tube (2) inwardly, and a plurality of conical portions (31) which cooperate with the stopper assembly (4) are arranged on the core shaft (3), so that when the core shaft (3) moves, the conical portions (31) gradually squeeze and push the stopper assembly (4) to move outwardly of the tube wall so as to press against the inner wall of the heat exchanger unit (1).

2. The heat exchanger pipe clamping device according to claim 1, characterized in that: Each of the limiter assemblies (4) comprises a plurality of sliders (41) arranged at intervals along the circumference of the expansion tube (2); the sliders (41) are movably arranged on the tube wall of the expansion tube (2); when the core shaft (3) drives the conical portion (31) to move, the bottom of the conical portion (31) and the slider (41) abut against each other, so as to gradually push the slider (41) outward to abut against the inner wall of the heat exchanger unit (1).

3. The heat exchanger pipe clamping device according to claim 2, characterized in that: A detachable expansion block (42) is provided on the top of the sliding block (41) to adapt to heat exchanger units (1) with different pipe diameters.

4. The heat exchanger pipe clamping device according to claim 2, characterized in that: The bottom surface of the sliding block (41) is an inclined surface, which is used to match the conical surface of the conical portion (31).

5. The heat exchanger pipe clamping device according to claim 2, characterized in that: Each of the limiting components (4) comprises an elastic limiting member (43), and the plurality of sliders (41) are installed on the expansion tube (2) by means of the elastic limiting member (43) and are used to reset the sliders (41) under elastic action when the core shaft (3) is reset.

6. The heat exchanger pipe clamping device according to claim 5, characterized in that: The elastic limiting member (43) is a ring spring, and each of the sliders (41) is provided with a limiting groove for embedding the ring spring, which is used to limit the positioning of the multiple sliders (41) on the expansion tube (2).

7. The heat exchanger pipe clamping device according to any one of claims 1 to 6, characterized in that: The core shaft (3) is sleeved with a plurality of tapered sleeves for forming a plurality of tapered portions (31), and a spacer sleeve (33) is sleeved between two adjacent tapered sleeves.

8. The heat exchanger pipe clamping device according to any one of claims 1 to 6, characterized in that: The expansion tube (2) is provided with a stopper (21) at one end and a detachably mounted tightening sleeve (22) at the other end, which is used to tighten the multiple heat exchanger units (1) after installation to achieve axial positioning.

9. The heat exchanger pipe clamping device according to any one of claims 1 to 6, characterized in that: A bushing assembly (5) is provided at the end of the expansion tube (2), and the bushing assembly (5) comprises an inner bushing (51) and an oil-free bushing (52) which are sleeved together. The oil-free bushing (52) is fixed at the end of the expansion tube (2), and the inner bushing (51) is passed through the core shaft (3).

10. The heat exchanger pipe clamping device according to any one of claims 1 to 6, characterized in that: A driving member (6) for driving the core shaft (3) to move axially is also provided. The driving member (6) is connected to the core shaft (3) extending out of the expansion tube (2) through a joint (32).

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