A spiral scraping device for cleaning the inner wall of a copper tube

Abstract

The utility model provides a kind of copper pipe inner wall cleaning's spiral scraping brush device, belong to copper pipe cleaning technical field, the spiral scraping brush device of this copper pipe inner wall cleaning, including brush body, transmission shaft and shaving piece, brush body is the brush bundle structure of spiral distribution along axial direction, the spiral center line of brush body coincides with the axis of transmission shaft, transmission shaft is through the geometric center of brush body and is fixedly connected with brush body, shaving piece is evenly distributed and is set along the circumferential direction of transmission shaft, the root of shaving piece is fixedly connected with the outer circumferential surface of transmission shaft by welding mode, the free end of shaving piece extends outward along the direction of being away from transmission shaft axis, the shaving edge of shaving piece is arc structure and the curvature radius of arc structure is adapted to the curvature radius of the copper pipe inner wall to be cleaned, the spiral direction of brush body is matched with the rotation direction of transmission shaft for generating the propelling force along axial direction in the rotating process, the radial spacing is formed between the shaving edge of shaving piece and the outer edge spiral track of brush body.

Description

Technical Field

[0001] This utility model belongs to the field of copper pipe cleaning technology, specifically, it relates to a spiral scraper device for cleaning the inner wall of copper pipes. Background Technology

[0002] Copper tubes, as commonly used heat exchange and fluid transport pipes, are widely used in air conditioning systems, refrigeration equipment, water heaters, chemical plants, and various fluid transport systems. During rolling, annealing, internal blowing, and stacking processes, rolling oil residue, annealing oxide layers, environmental oil stains, and metal dust impurities gradually accumulate on the inner wall of the copper tubes. These contaminants not only reduce the thermal conductivity of the copper tube itself but also increase the fluid transport resistance of the customer's system. In severe cases, they can even cause blockage at the entire machine's ports, affecting the normal operation of downstream equipment and the product's lifespan. Therefore, regularly cleaning the inner wall of the copper tubes is an important measure to maintain equipment performance. Current technologies for cleaning the inner wall of copper tubes mainly employ two categories of methods: chemical cleaning and mechanical cleaning. Chemical cleaning uses acid or alkaline solutions or special cleaning agents to soak or circulate and rinse the copper tubes. While this can dissolve some of the contaminants, it suffers from problems such as cleaning agent residue, corrosion of the copper tube material, and difficulties in waste liquid treatment. Furthermore, its effectiveness is limited for hard, firmly adhering contaminants. Mechanical cleaning methods primarily use brushes or scrapers to rotate and clean the inside of copper pipes. Existing mechanical cleaning tools are mostly single-brush or single-scraper structures. While a single brush structure can scrub the inner wall, it is ineffective at removing stubborn oxide layers and hard scale, often leaving residue after cleaning. A single scraper structure, although possessing strong scraping force, easily leaves blind spots on the inner wall and causes significant damage. Furthermore, existing mechanical cleaning tools rely mainly on the operator applying continuous pushing force when advancing through the copper pipe, which is laborious, difficult to maintain uniform cleaning pressure, and inefficient. Utility Model Content

[0003] In view of this, the present invention provides a spiral scraping device for cleaning the inner wall of copper pipes, which can solve the technical problem of incomplete cleaning in the existing copper pipe inner wall cleaning devices. In particular, for oxide layers, scale and other stubborn dirt that have accumulated on the inner wall of copper pipes over a long period of time, simple brushing is difficult to remove effectively, while simple scraping is easy to miss dirt dead corners, resulting in dirt remaining on the inner wall of the copper pipe after cleaning, which affects the thermal conductivity and service life of the copper pipe. At the same time, the existing cleaning devices require continuous manual pushing force when advancing inside the copper pipe, which is laborious and difficult to maintain the uniformity and continuity of cleaning.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a spiral scraping device for cleaning the inner wall of a copper pipe, including a brush body, a drive shaft, and scraping blades. The brush body has a bristle bundle structure distributed spirally along the axial direction. The spiral center line of the brush body coincides with the axis of the drive shaft. The drive shaft passes through the geometric center of the brush body and is fixedly connected to the brush body. The scraping blades are evenly distributed along the circumference of the drive shaft. The root of the scraping blade is fixedly connected to the outer circumferential surface of the drive shaft by welding. The free end of the scraping blade extends outward in a direction away from the axis of the drive shaft. The scraping edge of the scraping blade has an arc-shaped structure, and the radius of curvature of the arc-shaped structure is adapted to the radius of curvature of the inner wall of the copper pipe to be cleaned. The spiral direction of the brush body matches the rotation direction of the drive shaft to generate an axial propulsive force during rotation. A radial distance is formed between the scraping edge of the scraping blade and the spiral trajectory of the outer edge of the brush body.

[0006] The technical advantages of the spiral scraper device for cleaning the inner wall of copper pipes provided by this utility model are as follows: The spiral distribution of the brush body along the axial direction enables the device to generate axial self-propulsion during rotation. Combined with the arc-shaped scraping edge of the scraper blade adhering to the inner wall of the copper pipe, continuous scraping and cleaning of dirt is achieved. The synergistic effect of the brush body and the scraper blade allows for simultaneous coarse and fine cleaning. The welding and fixing method between the root of the scraper blade and the drive shaft ensures structural stability during high-speed rotation. The radial spacing design between the scraping edge and the outer edge of the brush body allows the scraper blade to contact stubborn dirt layers that the brush bristles cannot reach, thereby improving the thoroughness and efficiency of cleaning.

[0007] Based on the above technical solution, the spiral scraper device for cleaning the inner wall of copper pipes of this utility model can be further improved as follows:

[0008] The helix angle of the brush body is 30° to 50°, and the helix angle is the angle between the helix of the brush body and the plane perpendicular to the axis of the drive shaft.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the helix angle is controlled within the range of 30° to 50°, so that the axial thrust and radial cleaning force generated by the device during rotation can reach the best balance. Too small a helix angle will result in insufficient axial thrust, making it difficult for the device to move forward automatically inside the copper tube. Too large a helix angle will weaken the radial cleaning force and affect the cleaning effect. The setting of this angle range ensures that the device can move steadily inside the copper tube while maintaining sufficient radial cleaning pressure, making the cleaning process smooth and efficient.

[0010] Furthermore, the number of scraper blades is 3 to 6, and the interval angle between each scraper blade along the circumferential direction of the drive shaft is equal.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: setting the number of scraper blades to 3 to 6 and distributing them evenly along the circumference ensures comprehensive cleaning of the inner wall of the copper tube, avoiding the generation of blind spots in cleaning. The evenly distributed scraper blades make the drive shaft subjected to balanced forces during rotation, reducing vibration and wear caused by eccentric loads. The number setting of 3 to 6 blades can provide sufficient scraping contact points without increasing rotational resistance due to too many scraper blades, thus achieving a reasonable balance between cleaning effect and energy consumption.

[0012] Furthermore, the thickness of the scraper gradually decreases from the root to the free end, and the thickness of the free end of the scraper is 1 / 2 to 1 / 3 of the thickness of the root.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the tapered structure design with the thickness of the scraper gradually decreasing from the root to the free end gives the scraper appropriate elastic deformation ability during operation, which can better fit the small uneven surface of the inner wall of the copper tube. The thinner design at the free end gives the scraping edge a certain degree of flexibility, which can produce slight deformation when encountering hard dirt without breaking. At the same time, the thicker design at the root ensures the overall strength and rigidity of the scraper, enabling it to withstand repeated impact and torsional forces during the cleaning process.

[0014] Furthermore, the angle between the brush bristles and the axis of the drive shaft is 20° to 40°, and the root of the bristles is fixed on the outer circumferential surface of the drive shaft.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the bristle bundle maintains an angle of 20° to 40° with the axis of the drive shaft, so that the bristles can contact the inner wall of the copper tube at an appropriate angle of attack during rotation. This angle range ensures that the bristles can effectively scrub the inner wall surface without losing their cleaning ability due to excessive bending caused by an excessively large angle. The way in which the root of the bristle bundle is fixed to the outer circumferential surface of the drive shaft makes the bristles evenly distributed, ensuring that the contact pressure distribution of the entire brush body on the inner wall of the copper tube is consistent, thereby achieving a uniform cleaning effect.

[0016] Furthermore, the maximum radial distance between the scraping edge of the scraper and the axis of the drive shaft is greater than the maximum radial distance between the outer edge of the brush body and the axis of the drive shaft.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The design that the maximum radial distance between the scraping edge of the scraper and the axis of the drive shaft is greater than the maximum radial distance between the outer edge of the brush body and the axis of the drive shaft allows the scraper to penetrate into the dirt layer that remains after the brush bristles have cleaned it for secondary scraping. This differentiated design of radial distance forms a layered cleaning mechanism. The brush body first softens and initially removes the dirt, and then the scraper thoroughly removes the remaining hard dirt. The synergistic effect of the two greatly improves the thoroughness of cleaning, especially for stubborn dirt that has accumulated over a long period of time.

[0018] Furthermore, the scraper blade has a fan-shaped structure on a cross section perpendicular to the drive shaft axis, and the central angle of the fan-shaped structure is 15° to 30°.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The design of the scraper blade having a fan-shaped structure on the cross section perpendicular to the transmission shaft axis with a central angle of 15° to 30° ensures that the scraper blade has an appropriate contact area, which can provide sufficient scraping force without increasing excessive rotational resistance due to excessive contact area. The fan-shaped structure makes the scraper blade more evenly stressed during operation, avoiding the stress concentration phenomenon that is easily caused by sharp corner structures. The setting of this central angle range is the optimal parameter determined after optimization between scraping efficiency and structural strength.

[0020] Furthermore, one end of the drive shaft is provided with a connecting part, the cross-section of which is hexagonal or square for connecting with a drive tool.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the design of setting a connecting part at one end of the drive shaft with a hexagonal or square cross-section allows the device to be easily connected to an electric drill, hand-held rotary tool or special drive equipment. The non-circular cross-section structure of the hexagonal or square can effectively transmit torque and prevent slippage when rotating at high speed or encountering great resistance. The standardized design of the connecting part improves the versatility and practicality of the device. Users can select the appropriate drive tool according to actual needs, thereby adapting to different cleaning scenarios and working conditions.

[0022] Furthermore, the brush body is made of nylon fiber or steel wire, and the scraper blade is made of stainless steel or high-carbon steel.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the combination design of using nylon fiber or steel wire for the brush body and stainless steel or high carbon steel for the scraper blade gives the device both flexible cleaning and rigid scraping capabilities. The nylon fiber brush body is suitable for softer dirt and routine maintenance cleaning, while the steel wire brush body is suitable for stubborn oxide layers and hard deposits. The stainless steel or high carbon steel scraper blade has excellent hardness and wear resistance, and can maintain a sharp scraping edge for a long time. The reasonable selection of materials makes the device widely applicable and has a long service life.

[0024] Furthermore, the part of the root of the scraper blade that contacts the drive shaft is provided with an arc transition surface, the radius of which is 1 to 2 times the thickness of the scraper blade. The surface of the drive shaft is provided with a positioning groove along the axial direction corresponding to the number of scraper blades. The root of the scraper blade is embedded in the positioning groove and fixed by welding.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the arc transition surface at the root of the scraper blade with a radius of 1 to 2 times the thickness of the scraper blade effectively eliminates the stress concentration that may be caused by the right-angle connection at the root, significantly improving the fatigue strength of the scraper blade under high-speed rotation and repeated stress conditions. The positioning grooves set along the axial direction on the surface of the drive shaft correspond to the number of scraper blades, making the scraper blades accurately positioned during installation. The embedded structure increases the contact area between the scraper blade and the drive shaft, and the welding fixing method forms a firm connection, preventing the scraper blades from loosening or falling off during operation. The combined design of the arc transition surface and the positioning groove greatly extends the service life of the device and improves the safety of operation.

[0026] Compared with existing technologies, the beneficial effects of the spiral scraper device for cleaning the inner wall of copper pipes provided by this utility model are as follows: This utility model achieves layered and progressive cleaning of dirt on the inner wall of copper pipes through the synergistic cooperation of the spiral distribution structure of the brush body and the arc-shaped scraping edge of the scraper blade. The brush body first softens and initially removes the dirt, and then the scraper blade deeply scrapes away the remaining dirt. The two form a cleaning mechanism that combines coarse and fine cleaning, significantly improving the thoroughness of the cleaning. The spiral structure design allows the device to automatically generate axial propulsion force when rotating, realizing automatic propulsion of the device inside the copper pipe, reducing the labor intensity of the operator and improving cleaning efficiency. The design of the scraper blades being evenly distributed along the circumference eliminates cleaning blind spots and ensures all-round cleaning of the inner wall of the copper pipe. The differentiated radial spacing design between the scraper blades and the brush body makes the cleaning layers distinct, removing both surface dirt and deep, stubborn dirt. The welded and fixed connection between the drive shaft and the scraper blades, as well as the arc transition surface design at the root of the scraper blades, ensures the structural stability and operational safety of the device during high-speed rotation. The appropriate selection of brush and scraper materials makes the device suitable for different types of dirt and varying cleaning intensities, giving it wide applicability. The overall structure is simple and compact, with few parts, low manufacturing cost, and easy maintenance and replacement, resulting in good economic efficiency and practicality. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a spiral scraper device for cleaning the inner wall of a copper pipe;

[0029] Figure 2 A front view of a spiral scraper device for cleaning the inner wall of a copper pipe;

[0030] Figure 3 A schematic diagram of the use of a spiral scraper device for cleaning the inner wall of a copper pipe;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Brush body; 2. Drive shaft; 3. Scraper blade. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figures 1-3 The image shows a first embodiment of a spiral scraping device for cleaning the inner wall of a copper pipe provided by this utility model. In this embodiment, it includes a brush body, a drive shaft, and scraping blades. The brush body is a structure of bristles arranged in a spiral along the axial direction. The spiral center line of the brush body coincides with the axis of the drive shaft. The drive shaft passes through the geometric center of the brush body and is fixedly connected to the brush body. The scraping blades are evenly distributed along the circumference of the drive shaft. The root of the scraping blade is fixedly connected to the outer circumferential surface of the drive shaft by welding. The free end of the scraping blade extends outward in a direction away from the axis of the drive shaft. The scraping edge of the scraping blade has an arc-shaped structure, and the radius of curvature of the arc-shaped structure is adapted to the radius of curvature of the inner wall of the copper pipe to be cleaned. The spiral direction of the brush body matches the rotation direction of the drive shaft to generate an axial propulsive force during rotation. A radial distance is formed between the scraping edge of the scraping blade and the spiral trajectory of the outer edge of the brush body.

[0035] In the above technical solution, the helix angle of the brush body is 30° to 50°, and the helix angle is the angle between the helix of the brush body and the plane perpendicular to the axis of the transmission shaft.

[0036] Furthermore, in the above technical solution, the number of scraper blades is 3 to 6, and the interval angle between each scraper blade along the circumferential direction of the drive shaft is equal.

[0037] Furthermore, in the above technical solution, the thickness of the scraper gradually decreases from the root to the free end, and the thickness of the free end of the scraper is 1 / 2 to 1 / 3 of the thickness of the root.

[0038] Furthermore, in the above technical solution, the angle between the brush bristles and the axis of the drive shaft is 20° to 40°, and the root of the bristles is fixed on the outer circumferential surface of the drive shaft.

[0039] Furthermore, in the above technical solution, the maximum radial distance between the scraping edge of the scraper blade and the axis of the drive shaft is greater than the maximum radial distance between the outer edge of the brush body and the axis of the drive shaft.

[0040] Furthermore, in the above technical solution, the scraper blade has a fan-shaped structure on the cross section perpendicular to the transmission shaft axis, and the central angle of the fan-shaped structure is 15° to 30°.

[0041] Furthermore, in the above technical solution, one end of the drive shaft is provided with a connecting part, the cross-section of which is hexagonal or square for connecting with the drive tool.

[0042] Furthermore, in the above technical solution, the brush body is made of nylon fiber or steel wire, and the scraper blade is made of stainless steel or high carbon steel.

[0043] Furthermore, in the above technical solution, the part where the root of the scraper blade contacts the drive shaft is provided with an arc transition surface. The radius of the arc transition surface is 1 to 2 times the thickness of the scraper blade. The surface of the drive shaft is provided with a positioning groove along the axial direction corresponding to the number of scraper blades. The root of the scraper blade is embedded in the positioning groove and fixed by welding.

[0044] The following is a specific embodiment 1 of this utility model. The spiral scraper device provided in this embodiment is used to clean the inner wall of a copper pipe with an inner diameter of 15mm to 20mm. The drive shaft is made of stainless steel round bar with a diameter of 8mm and a length of 600mm. One end of the drive shaft is machined into a hexagonal connecting part with a side-to-side distance of 10mm and a length of 50mm, for connection with a standard electric drill chuck. The brush body is made of nylon fiber material with bristles of 0.3mm in diameter and 12mm in length. The bristle bundles are arranged spirally on the outer circumferential surface of the drive shaft with a spiral helix angle of 40° and an angle of 30° between the bristle bundles and the axis of the drive shaft. The roots of the bristle bundles are fixed to the surface of the drive shaft with adhesive. The spiral distribution of the brush body results in an axial spacing of 25mm between two adjacent turns of bristle bundles. The brush body extends 500mm outward from the drive shaft connecting part. Four positioning grooves are evenly opened axially on the surface of the drive shaft. The positioning grooves are 2mm deep and 3mm wide, and the four positioning grooves are evenly distributed at 90-degree intervals along the circumferential direction. The scraper blades are made of 1.5mm thick 304 stainless steel sheet. Each scraper blade is 35mm long and 20mm wide. The root of the scraper blade is embedded in a positioning groove to a depth of 2mm and is fixed to the drive shaft by argon arc welding. The free end of the scraper blade extends outward and bends away from the axis of the drive shaft to form an arc-shaped structure. The radius of curvature of the arc-shaped scraping edge is 8.5mm, which matches the radius of curvature of the inner wall of the 17mm inner diameter copper tube. The thickness of the scraper blade gradually decreases from 1.5mm at the root to 0.6mm at the free end, forming a conical structure. A rounded transition surface with a radius of 2mm is provided at the contact point between the root of the scraper blade and the drive shaft. The scraper blades are fan-shaped on a section perpendicular to the drive shaft axis, with a central angle of 22°. Four scraper blades are arranged in groups of 80mm along the length of the drive shaft, with each group of four blades evenly distributed circumferentially. The maximum radial distance between the scraping edge of the scraper blade and the drive shaft axis is 9.5mm, which is greater than the maximum radial distance of 8mm between the outer edge of the brush body and the drive shaft axis. In use, the connecting part is inserted into the drill chuck for fixation, and the device is inserted into the copper tube. The drill is started, causing the drive shaft to rotate at 800r / min to 1200r / min. The device automatically advances into the copper tube using the thrust generated by the spiral structure. The bristles first contact the inner wall to scrub and soften the surface dirt, and the scraper blades then scrape away the remaining hard dirt, achieving layered cleaning. The cleaning speed is approximately 300mm to 500mm per minute. After cleaning, the inner wall of the copper tube is smooth and free of residual dirt, and its thermal conductivity is significantly restored.

[0045] The following is another specific embodiment 2 of this utility model. Embodiment 2 is based on Embodiment 1, but the brush body material is changed to stainless steel wire with a diameter of 0.25mm. The wire bristles are 10mm long, the spiral angle of the bristle bundles is adjusted to 35°, and the angle between the bristle bundles and the drive shaft axis is adjusted to 25°. The wire brush body has stronger rigidity and cleaning power, making it particularly suitable for cleaning stubborn oxide layers and hard scale deposits on the inner wall of copper pipes. The scraper blade material is changed to high-carbon steel with higher hardness. The scraper blade surface is quenched to achieve a hardness of HRC55~HRC60, further improving the sharpness and wear resistance of the scraping edge. The number of scraper blades is increased to 6 per group, evenly distributed at 60° intervals along the circumference. The axial spacing between each group of scraper blades is shortened to 60mm, increasing the total number of scraper blades and the cleaning coverage density. Six positioning grooves are correspondingly opened on the drive shaft surface for installing the six scraper blades, with the positioning grooves distributed at 60° intervals along the circumference. This embodiment is suitable for cleaning heavily contaminated copper pipes, especially those that have not been cleaned for a long time, resulting in the formation of a thick layer of oxide scale and hard deposits on the inner wall. The rotation speed can be increased to 1000r / min~1500r / min, which provides stronger cleaning power and a more thorough removal of stubborn dirt. The cleaned inner wall of the copper pipe can be restored to a smoothness close to that of a new pipe.

[0046] The following is another specific embodiment 3 of this utility model. Embodiment 3 is based on Embodiment 1, but adds a flexible cleaning layer to the spiral structure of the brush body. Specifically, a flexible scraping ring made of natural rubber is inserted every two turns of the nylon fiber bristles. The flexible scraping ring has a ring structure, is fitted onto the drive shaft and fixed by adhesive. The outer diameter of the flexible scraping ring is 16mm, and the thickness is 3mm. The outer edge of the flexible scraping ring forms a slight interference fit with the inner wall of the copper tube. When the device rotates and advances, the flexible scraping ring can gently scrape the inner wall, playing an auxiliary cleaning and sealing role, preventing the cleaned dirt from re-adhering to the cleaned area. At the same time, the flexible scraping ring can also polish the inner wall after cleaning by the bristles and scraper blade, improving the smoothness of the inner wall. The arc-shaped scraping edge of the scraper blade is finely ground, and the roughness of the scraping edge is controlled below Ra0.8um, making the scraping edge sharper and causing less damage to the inner wall of the copper tube, resulting in a smoother scraping process and reducing vibration and noise during scraping. This embodiment is suitable for applications requiring high-quality cleaning, such as copper tubes for precision instruments and medical equipment. The cleaned inner wall is not only free of dirt residue, but also has a high degree of surface smoothness, which can restore the original performance of the copper tube to the greatest extent.

[0047] Specifically, the principle of this invention is as follows: This device establishes a layered, progressive cleaning mechanism by combining the spiral distribution structure of the brush body with the arc-shaped scraping edge of the scraper blade. The brush body is spirally distributed along the drive shaft, with the spiral angle set between 30 and 50 degrees. When the drive shaft drives the brush body to rotate, the spiral structure converts part of the rotational torque into axial thrust, allowing the device to automatically advance inside the copper tube without the need for continuous manual application of thrust. This principle is similar to that of a propeller moving forward in a fluid. The bristles of the brush body are inclined at an angle of 20 to 40 degrees to the axis of the drive shaft, so that the bristles contact the inner wall of the copper tube at an appropriate angle of attack when rotating, producing an effective scrubbing effect that softens and initially removes dirt. The scraper blade is fixed to the drive shaft, and the radial distance of its scraping edge is greater than the radial distance of the brush body's outer edge. This radial difference creates a layered cleaning effect during the cleaning process, first soft then hard, and first coarse then fine. The brush body first contacts the inner wall to scrub, softening and removing surface dirt, while the scraper blade then contacts the inner wall to deeply scrape away the remaining hard dirt. The arc-shaped scraping edge design of the scraper blade ensures that its radius of curvature matches the radius of curvature of the copper tube's inner wall, guaranteeing good contact between the scraper blade and the inner wall, maximizing the scraping contact area, and improving scraping efficiency. The even distribution of the scraper blade along the circumference ensures comprehensive cleaning coverage without dead corners, while also balancing the force on the drive shaft and reducing vibration. The scraper blade adopts a gradually changing thickness design, being thicker at the root to ensure strength and thinner at the free end to provide elasticity, allowing the scraper blade to adapt to minor unevenness of the inner wall during operation and maintain continuous and effective scraping pressure. The working principle of the entire device embodies the organic combination of multiple technical concepts, including spiral propulsion, layered cleaning, elastic bonding, and force balance.

[0048] The specific operation or use method of this utility model is as follows: Before use, first select a suitable spiral scraper device according to the inner diameter of the copper pipe to be cleaned, ensuring that the outer diameter of the brush body and the radial extension dimension of the scraping edge of the scraper blade match the inner diameter of the copper pipe. Insert the connecting part of the drive shaft into the chuck of the electric drill or handheld rotary tool and clamp it firmly to ensure a secure connection without looseness. Align the brush body end of the device with the copper pipe inlet, start the drive tool to start rotating the drive shaft. The initial speed should be controlled within a moderate range to observe the device's entry into the copper pipe. Once the brush body enters the copper pipe, the operator only needs to keep the device axis aligned with the copper pipe axis. The device will automatically advance deeper into the copper pipe using the axial thrust generated by the spiral structure. The operator can apply a slight auxiliary thrust as needed to speed up the cleaning process. During the cleaning process, the drive tool speed should be kept stable to avoid frequent acceleration and deceleration, which can lead to uneven cleaning results. When the device has advanced to the other end of the copper pipe, the drive shaft can be rotated in the opposite direction to remove the device, or the forward rotation can be continued to allow the device to pass completely through the copper pipe. For longer copper pipes or thicker dirt, it is recommended to perform multiple reciprocating cleaning operations to ensure thorough cleaning. After cleaning, turn off the drive tool, remove the device from the copper tube, and rinse the brush body and scraper blade with clean water to remove any remaining dirt. Check the scraper blade for wear or deformation and replace it if necessary. Different brush materials can be selected for different types of dirt. Nylon fiber brushes are suitable for general dirt and daily maintenance, while steel wire brushes are suitable for stubborn oxide layers and hard deposits.

Claims

1. A spiral scraping device for cleaning the inner wall of a copper pipe, comprising a brush body, a drive shaft, and scraping blades. The brush body is a structure of bristles arranged spirally along the axial direction. The spiral centerline of the brush body coincides with the axis of the drive shaft. The drive shaft passes through the geometric center of the brush body and is fixedly connected to the brush body. The scraping blades are evenly distributed along the circumference of the drive shaft. The root of the scraping blade is fixedly connected to the outer circumferential surface of the drive shaft by welding. The free end of the scraping blade extends outward in a direction away from the axis of the drive shaft. The scraping edge of the scraping blade has an arc-shaped structure, and the radius of curvature of the arc-shaped structure is adapted to the radius of curvature of the inner wall of the copper pipe to be cleaned. The spiral direction of the brush body matches the rotation direction of the drive shaft to generate an axial propulsive force during rotation. A radial distance is formed between the scraping edge of the scraping blade and the spiral trajectory of the outer edge of the brush body.

2. The spiral scraper device for cleaning the inner wall of a copper pipe according to claim 1, characterized in that, The helix angle of the brush body is 30° to 50°, and the helix angle is the angle between the helix of the brush body and the plane perpendicular to the axis of the drive shaft.

3. The spiral scraper device for cleaning the inner wall of a copper pipe according to claim 2, characterized in that, The number of scraper blades is 3 to 6, and the interval angle between each scraper blade along the circumferential direction of the drive shaft is equal.

4. The spiral scraper device for cleaning the inner wall of a copper pipe according to claim 3, characterized in that, The thickness of the scraper gradually decreases from the root to the free end, and the thickness of the free end of the scraper is 1 / 2 to 1 / 3 of the thickness of the root.

5. The spiral scraper device for cleaning the inner wall of a copper pipe according to claim 4, characterized in that, The angle between the brush bristles and the axis of the drive shaft is 20° to 40°, and the root of the bristles is fixed to the outer circumferential surface of the drive shaft.

6. The spiral scraper device for cleaning the inner wall of a copper pipe according to claim 5, characterized in that, The maximum radial distance between the scraping edge of the scraper and the axis of the drive shaft is greater than the maximum radial distance between the outer edge of the brush body and the axis of the drive shaft.

7. A spiral scraper device for cleaning the inner wall of a copper pipe according to claim 6, characterized in that, The scraper blade has a fan-shaped structure on a cross section perpendicular to the axis of the drive shaft, and the central angle of the fan-shaped structure is 15° to 30°.

8. The spiral scraper device for cleaning the inner wall of a copper pipe according to claim 7, characterized in that, One end of the drive shaft is provided with a connecting part, the cross-section of which is hexagonal or square for connecting with a drive tool.

9. A spiral scraper device for cleaning the inner wall of a copper pipe according to claim 8, characterized in that, The brush body is made of nylon fiber or steel wire, and the scraper blade is made of stainless steel or high carbon steel.

10. A spiral scraper device for cleaning the inner wall of a copper pipe according to claim 9, characterized in that, The root of the scraper blade is provided with an arc transition surface at the contact point with the drive shaft. The radius of the arc transition surface is 1 to 2 times the thickness of the scraper blade. The surface of the drive shaft is provided with positioning grooves along the axial direction corresponding to the number of scraper blades. The root of the scraper blade is embedded in the positioning groove and fixed by welding.

Images