A heat exchanger tube cutting tool
By designing a cutting tool for heat exchange pipes, using the combination of concave and convex edges and inclined chip discharge grooves, the problems of low repair efficiency and low rework qualification rate in the prior art are solved, and an efficient and simple repair process is achieved.
Patent Information
- Application Number
- CN202421351513.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-13
AI Technical Summary
The prior art repair methods for defective heat exchange pipes are inefficient, have many operating steps, are prone to damage fins, require multiple tools to cooperate, and have a low pass rate for rework.
An exchanger heat exchange tube cutting tool is designed, including a blade that extends along the axis of the tool body. The outer edge of the blade forms a concave and convex edge, combined with an inclined chip discharge groove, and the cutting is rotated until the entire defective copper tube is drilled.
The heat exchanger tube is efficiently removed, which simplifies the operation steps, avoids damage to the fins, reduces the required tools, and improves the efficiency and pass rate of rework.
Smart Images
Figure CN222725543U_ABST
Abstract
Description
Technical Field
[0001] The utility model is used in the field of heat exchanger maintenance, in particular to a heat exchange tube cutting tool for the exchanger. Background Art
[0002] The existing method for repairing defective heat exchange tubes is to use a knife bar to cut the copper tube axially into multiple parts, and then pull out the copper skin. The specific method is to place the knife bar at the mouth of the defective copper tube, use an air hammer to hit the knife bar into the copper tube and push through the copper tube, and cut off a copper skin connected to the copper tube from the copper tube wall of the copper tube; use needle-nosed pliers to expand the gap pushed out by the knife bar; use needle-nosed pliers to remove the part of the copper tube that exceeds the fin on the copper tube, and keep the copper skin; use a pulling fixture to pass the iron wire through the copper tube, and use the iron wire to cover the copper skin and pull it back; use needle-nosed pliers to shrink the copper tube; use vise-jaw pliers to clamp the copper skin and pull it back until the copper tube and the copper skin are pulled out together.
[0003] The existing methods for repairing defective heat exchange tubes have the following disadvantages: 1. Low efficiency (many operation steps); 2. The repair method of breaking the copper tube is easy to damage the fins; 3. Multiple tools are required. 4. Because the bullhead knife cannot completely break the copper tube, the repair fails and the workpiece is scrapped. 5. The repair qualification rate is low. Utility Model Content
[0004] The utility model aims to solve at least one of the technical problems existing in the prior art and provides a heat exchange tube cutting tool for an exchanger.
[0005] The technical solution adopted by the utility model to solve its technical problems is:
[0006] A heat exchanger tube cutting tool for an exchanger comprises a tool body, wherein the tool body extends from a first end to a second end along an axis, a tool handle is provided at the first end of the tool body, a conical slope surface inclined toward the axis direction is provided at the second end of the tool body, the tool body has a plurality of blades extending away from the axis direction, the outer edges of the blades form a cutting edge, the blades comprise an inclined blade extending to the conical slope surface, the outer edges of the inclined blades form a concave-convex cutting edge, and the tool body is provided with an inclined chip removal groove on the front side of the inclined blade along the rotational cutting direction.
[0007] In combination with the above implementations, in certain implementations, the concave-convex cutting edge is wavy.
[0008] In combination with the above implementations, in some implementations, the blade includes a straight blade parallel to the axial direction, the outer edge of the straight blade forms a straight cutting edge, and the tool body is provided with a straight chip groove on the front side of the straight blade along the rotational cutting direction.
[0009] In combination with the above implementations, in certain implementations, the straight blade is connected to the inclined blade, and the straight chip groove is connected to the inclined chip groove.
[0010] In combination with the above implementations, in certain implementations, the blade body extends from a first surface to a second surface along a thickness direction, the first surface and the second surface are parallel to the axis, and the blade body is defined as a flat blade body by the first surface and the second surface.
[0011] In combination with the above implementations, in some implementations, the blade includes a first blade and a second blade that are centrally symmetrically distributed, the first blade extends along a first surface away from the axis, and the second blade extends along a second surface away from the axis.
[0012] In combination with the above implementations, in some implementations, the first surface transitions toward the second blade through an arc on a side away from the first blade, and the second surface transitions toward the first blade through an arc on a side away from the second blade.
[0013] In combination with the above implementations, in certain implementations, the bottom cross-section of the straight chip groove is in an arc shape.
[0014] In combination with the above implementations, in certain implementations, the bottom cross-section of the inclined chip removal groove is in an arc shape.
[0015] In combination with the above implementations, in some implementations, the knife handle and the knife body are made in one piece.
[0016] One of the above technical solutions has at least one of the following advantages or beneficial effects: the technical solution of the utility model can be used to disassemble the heat exchange tube of the heat exchanger. When working, the defective copper tube is detected, the tool is placed at the mouth of the defective copper tube, and the rotating tool is driven to drill the defective copper tube until the entire defective copper tube is drilled. During the cutting process, the concave and convex edges are operated first, and the first section of the convex edge cuts the copper tube to produce copper chips, which fall into the inclined chip removal groove; due to the tensile resistance of the copper material, the chips on some copper tubes are not cut off, and enter the second concave edge position temporarily and transition. As the tool moves forward and rotates, the second convex edge further cuts, that is, the position difference and different cutting edges of the second convex edge are used to cut off the copper tube that is not cut off by the first section of the convex edge, and this is repeated until the chip is completely cut. The technical solution of the utility model has a simple tool structure; fewer rework tools; high efficiency; simple operation; no damage to the fins; combined with the design of the concave and convex edges, the chip removal capacity can be improved, the conical slope can improve the chip guiding capacity, and the radial and axial scraping is thorough, and the chips are easy to remove.
[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0019] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;
[0020] Figure 2 yes Figure 1 A side view of the structure of an embodiment shown;
[0021] Figure 3 yes Figure 1 An end view of one embodiment is shown;
[0022] Figure 4 yes Figure 1 One embodiment shown uses a state diagram. DETAILED DESCRIPTION
[0023] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.
[0024] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.
[0025] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0026] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.
[0027] An embodiment of the utility model provides a heat exchange tube cutting tool for a heat exchanger, which can be used for disassembling the heat exchange tube of a heat exchanger.
[0028] See also Figure 1-Figure 3 The heat exchanger tube cutting tool for heat exchanger includes a tool body 100, which extends from a first end to a second end along the axis. Along the feeding direction of the tool when in use, the first end is the rear end of the tool body 100, and the second end is the front end of the tool body 100. The first end of the tool body 100 is provided with a tool handle 200, and the tool handle 200 is integrally made or assembled with the tool body 100. The second end of the tool body 100 is provided with a conical slope 101 inclined in the direction of the axis. The tool body 100 has a plurality of blades extending in a direction away from the axis, and the outer edges of the blades form a cutting edge. The blade includes an inclined blade 102 extending to the conical slope 101. In view of the characteristics of copper materials having high tensile strength and easy to generate burrs, the outer edge of the inclined blade 102 forms a concave-convex cutting edge 103, and the concave-convex cutting edge 103 is equivalent to a tool composed of multiple blade heads. The cutter body 100 is provided with an inclined chip removal groove 104 on the front side of the inclined blade 102 along the rotational cutting direction. The inclined chip removal groove 104 provides a temporary storage space for the copper chips generated by scraping, so that the copper chips can quickly escape from the cutting edge of the cutter to avoid the copper chips hindering the rotation and feeding of the cutter. The entire operation process is in a narrow space, so chip removal and temporary storage of chips are very important.
[0029] Combination Figure 4When the embodiment of the utility model is used to disassemble the heat exchange tube of the heat exchanger, the defective copper tube 300 is first detected, and then the tool is placed at the mouth of the defective copper tube 300, and the rotating tool is driven to drill the defective copper tube 300 until the entire defective copper tube 300 is drilled. During the cutting process, the concave and convex cutting edge 103 is operated first, and the first section of the convex cutting edge cuts the copper tube 300 to produce copper chips, which fall into the inclined chip groove 104; due to the tensile strength of the copper material, the chips on some copper tubes 300 are not cut off, and enter the second concave cutting edge position for temporary suspension and transition. As the tool moves forward and rotates, the second convex cutting edge further cuts, that is, the position difference and different cutting edges of the second convex cutting edge are used to cut off the copper tube 300 that is not cut off by the first section of the convex cutting edge, and this process is repeated until the chips are completely cut off and the integrity of the fin 400 is ensured. The technical solution of the utility model has a simple tool structure, fewer repair tools, high efficiency, easy operation, and will not damage the fins. The design of the concave and convex cutting edge 103 can improve the chip crushing capacity, the conical slope 101 can improve the chip guiding capacity, and the radial and axial scraping is thorough, and the chips are easy to remove.
[0030] During the entire operation, the tool performed excellently in the chip breaking process, and the copper chip particles were all below 0.5 mm. Because the entire operation was carried out in a narrow space, the copper chips generated could not be removed from the operation area like machining, but could only be temporarily stored in the narrow fin holes. The tool operation generated tiny particles of copper chips, and due to the vibration generated by the operation, tiny gaps appeared at the joints of the fins. Most of the tiny particles of copper chips were automatically discharged from the channel, and the rest of the copper chips could be blown out by compressed air.
[0031] The concave-convex cutting edge 103 is composed of convex cutting edges and concave cutting edges that are alternately distributed. For example, in some embodiments, see Figure 2 The concave-convex cutting edge 103 is wavy. The wavy concave-convex cutting edge 103 can better meet the characteristics of copper material, which has high tensile strength and is easy to generate burrs.
[0032] In some embodiments, see Figure 1-Figure 3 The blade includes a straight blade parallel to the axial direction, and the outer edge of the straight blade forms a straight cutting edge 105. The blade body 100 is provided with a straight chip groove 109 on the front side of the straight blade along the rotational cutting direction. The straight blade is connected with the inclined blade 102, and the straight chip groove is connected with the inclined chip groove 104. The copper chips generated by the inclined blade 102 can be introduced into the straight chip groove by the inclined chip groove 104, so as to avoid the accumulation of copper chips at the position of the inclined blade 102 and cause the tool to be blocked. Due to the tensile strength of copper and the stress of the copper tube 300 after the expansion, copper skin may be left on the arc wall in the channel after the concave-convex blade 103 is cut. The outer diameter of the straight blade 105 is consistent with the outer diameter of the copper tube 300, so the copper chips can be further cleaned to ensure that the new copper tube 300 is smoothly inserted into the copper tube 300 channel without damaging the fins. The copper chips generated by cutting fall into the straight chip groove 109.
[0033] In some embodiments, see Figure 1 , Figure 3 The blade body 100 extends from the first surface 106 to the second surface 107 along the thickness direction, the first surface 106 and the second surface 107 are parallel to the axis, and the blade body 100 defines a flat blade body 100 through the first surface 106 and the second surface 107. The flat structure of the tool in this embodiment is to reduce its own volume and make sufficient space to temporarily store copper chips; the arc structure of the tool is conducive to the rotation of the tool and the centrifugal slag discharge; at the same time, the fins will not be damaged due to the copper chips squeezing the fins. Compared with ordinary round knives, there is no chip discharge space, and the copper chips generated are long and large, causing the tool to stall.
[0034] For further information, see Figure 1 , Figure 3 The blade includes a first blade and a second blade that are symmetrically distributed in the center, the first blade extends along the first surface 106 along the spiral curved surface away from the axis, and the second blade extends along the second surface 107 along the spiral curved surface away from the axis. The first blade and the second blade that are symmetrically distributed in the center can achieve more stable cutting, while ensuring that the tool has sufficient chip removal space to avoid tool stalling.
[0035] For further information, see Figure 1 , Figure 3 The first surface 106 transitions to the second blade direction through the arc surface 108 on the side away from the first blade, and the second surface 107 transitions to the first blade direction through the arc surface 108 on the side away from the second blade. The arc surface 108 transitions to the straight chip groove 109, and the copper chips cut by the straight cutting edge 105 first gather in the straight chip groove 109. Excess copper chips can pass over the arc surface 108 and gather in the outer space of the first surface 106 and the second surface 107 to avoid tool blocking.
[0036] In some embodiments, see Figure 1 , Figure 3 The straight chip groove has a circular arc-shaped bottom cross section. The inclined chip groove 104 has a circular arc-shaped bottom cross section. The straight chip groove and the inclined chip groove 104 with a circular arc-shaped bottom cross section provide temporary storage space for the copper chips generated by scraping; the copper chips are quickly separated from the tool edge, and the copper chips are prevented from hindering the rotation and feeding of the tool.
[0037] In the description of this specification, the description with reference to the terms "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0038] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A heat exchanger tube cutting tool, characterized in that: The utility model comprises a tool body, which extends from a first end to a second end along an axis, a tool handle is provided at the first end of the tool body, a conical slope surface inclined toward the axis direction is provided at the second end of the tool body, the tool body has a plurality of blades extending away from the axis direction, the outer edges of the blades form a cutting edge, the blades comprise inclined blades extending to the conical slope surface, the outer edges of the inclined blades form a concave-convex cutting edge, and the tool body is provided with an inclined chip removal groove at the front side of the inclined blade along the rotational cutting direction.
2. The heat exchanger tube cutting tool according to claim 1, characterized in that: The concave-convex cutting edge is wavy.
3. The heat exchanger tube cutting tool according to claim 1, characterized in that: The blade comprises a straight blade parallel to the axial direction, the outer edge of the straight blade forms a straight cutting edge, and the blade body is provided with a straight chip removal groove on the front side of the straight blade along the rotation cutting direction.
4. The heat exchanger tube cutting tool according to claim 3, characterized in that: The straight blade is connected with the inclined blade, and the straight chip groove is connected with the inclined chip groove.
5. The heat exchanger tube cutting tool according to claim 3, characterized in that: The blade body extends from a first surface to a second surface along a thickness direction, the first surface and the second surface are parallel to the axis, and the blade body defines a flat blade body through the first surface and the second surface.
6. The heat exchanger tube cutting tool according to claim 5, characterized in that: The blade comprises a first blade and a second blade which are symmetrically distributed along the center. The first blade extends along a first surface in a direction away from the axis, and the second blade extends along a second surface in a direction away from the axis.
7. The heat exchanger tube cutting tool according to claim 6, characterized in that: The first surface transitions to the second blade direction through an arc surface at a side away from the first blade, and the second surface transitions to the first blade direction through an arc surface at a side away from the second blade.
8. The heat exchanger tube cutting tool according to claim 3, characterized in that: The bottom cross section of the straight chip removal groove is in an arc shape.
9. The heat exchanger tube cutting tool according to claim 1, characterized in that: The groove bottom cross section of the inclined chip removal groove is in an arc shape.
10. The heat exchanger tube cutting tool according to claim 1, characterized in that: The knife handle is made integrally with the knife body.