Electric tool

Abstract

The utility model discloses an electric tool which comprises a shell, a working element and a pipe fitting, the shell is provided with a dust collecting opening and a fixed end portion, the fixed end portion defines a first channel communicated with the dust collecting opening, and the pipe fitting comprises a connecting end portion connected to the fixed end portion and a pipe fitting body connected to the connecting end portion. The pipe fitting body is communicated with the first channel through the connecting end part; a second channel communicated with the first channel is formed in the connecting end part; the connecting end comprises an outer pipe arranged on the periphery of the fixed end, a notch extending in the axial direction of the outer pipe is formed in the outer pipe, and the notch is configured to allow the outer pipe to elastically deform in the radial direction so as to achieve interference fit with the fixed end. According to the electric tool, the notch extending in the axial direction is formed in the connecting end, so that the outer pipe has the elastic deformation capacity, interference fit between the outer pipe and the fixed end is achieved, multi-directional constraint is formed, stress can be evenly dispersed, the assembling process is simplified, the sealing performance is enhanced, and the fastening performance, the reliability and the manufacturability are all considered.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and specifically to a connection structure for a tube for collecting debris in power tools. Background Technology

[0002] Power tools, such as circular saws, help users precisely and quickly cut steel, wood, and other target objects. They are widely used in manufacturing and are an important production tool. However, circular saws generate a large amount of debris when cutting. This debris can cause a dirty working environment, and if it enters other equipment, it can damage it. Furthermore, debris entering the eyes or body can pose health risks to operators. Currently, circular saws typically have through holes in their housings, with corresponding dust collection pipes fixed to these holes. The debris generated during cutting passes through these holes and is collected in the dust collection pipes, preventing it from flying out.

[0003] However, the structure used to fix the dust collection pipe in the relevant technology has low fixing strength to the hose, which easily leads to failure of the dust collection pipe, causing the dust collection pipe to detach from the shell and fail to collect debris normally. Utility Model Content

[0004] The purpose of this utility model is to provide an electric tool that can improve the fastening strength of pipe fittings, so that the pipe fittings are firmly connected to the electric tool.

[0005] To solve the above-mentioned technical problems, this utility model provides an electric tool, including a housing forming a receiving space, a working element rotatably connected to the housing, and a tube connected to the housing. The housing has a dust collection port communicating with the receiving space and a fixed end corresponding to the dust collection port. The fixed end forms a first channel communicating with the dust collection port. The tube includes a connecting end connected to the fixed end and a tube body connected to the connecting end. The tube body communicates with the first channel through the connecting end. The connecting end forms a second channel communicating with the first channel. The connecting end includes an outer tube disposed on the outer periphery of the fixed end. The outer tube has a notch extending axially along the outer tube. The notch is configured to allow radial elastic deformation of the outer tube to achieve an interference fit with the fixed end.

[0006] By providing an axially extending notch at the connection end, the outer tube can be radially elastically deformed and pressurized to fit the fixed end. This structure utilizes the radial clamping force generated by elastic deformation to form multi-directional constraints, significantly improving circumferential torsional and axial tensile strength, effectively resisting connection loosening caused by high-frequency vibration, while simplifying the assembly process, reducing machining accuracy requirements, and adapting to the rapid assembly needs of automated production lines.

[0007] Optionally, the connecting end further includes an inner tube surrounding the inner periphery of the outer tube, with an assembly cavity formed between the inner tube and the outer tube, and the fixed end extending into the assembly cavity to connect with the connecting end.

[0008] An assembly cavity is constructed between the inner and outer tubes, and a double-sided tight fit connection is formed after the fixed end is inserted. The axially extending cavity provides precise positioning and guidance, avoiding assembly misalignment. The circumferentially evenly distributed gap structure can disperse alternating stress and suppress fatigue failure caused by local stress concentration. Compared with traditional single-interface connections, it significantly enhances the connection stability and reliability under complex working conditions.

[0009] Optionally, the connecting end includes a first connecting pipe section and a second connecting pipe section connected to each other. The first connecting pipe section is composed of the inner pipe and the outer pipe. The first connecting pipe section is connected to the fixed end, and the second connecting pipe section is connected to the pipe body. The fixed end is provided with a first limiting part, and the first connecting pipe section is provided with a second limiting part. The first limiting part and the second limiting part are mutually engaged to fix the connecting end circumferentially relative to the fixed end.

[0010] The fixed end and the first connecting pipe section are circumferentially fixed by the limiting part. This mechanical limiting structure effectively blocks the torque transmission path and prevents the pipe from loosening due to the reverse torque generated by the rotation of the working element. It is especially suitable for high-frequency torsion operation scenarios such as angle grinders and electric drills. While improving the reliability of the connection, it avoids the use of additional anti-loosening parts and reduces the complexity of the structure.

[0011] Optionally, the outer periphery of the fixed end is provided with the first limiting part, and the outer tube is provided with the second limiting part; there are two of each of the first limiting part and the second limiting part. In the circumferential direction of the outer tube, the first limiting part is respectively provided on the opposite sides of the fixed end, and the second limiting part is respectively provided on the opposite sides of the outer tube, and they are locked in a one-to-one correspondence.

[0012] The symmetrically arranged double-limiting design ensures uniform stress distribution at the connection interface, preventing eccentric deformation caused by unilateral force. The opposing clamping structure balances circumferential torque, reduces localized wear, and extends component lifespan. It is particularly suitable for power tools that need to withstand cyclic or impact loads, ensuring that connection strength does not decrease during long-term use.

[0013] Optionally, the first limiting portion is a protrusion extending radially along the outer tube, and the second limiting portion is formed by the inner wall of a notch in the outer tube. The protrusion is at least partially located in the notch and abuts against the inner wall of the notch. In the circumferential direction of the outer tube, the size of the protrusion is larger than the size of the notch. At least one inner wall of the notch is provided with a limiting groove, and the protrusion is partially embedded in the limiting groove and abuts against its inner wall to achieve axial fixation.

[0014] The embedded fit between the protrusion and the limiting groove achieves dual locking in both the circumferential and axial directions. After the protrusion is embedded in the limiting groove, the clamping force generated by the elastic deformation recovery of the outer tube and the limiting force of the groove wall work together to form a composite constraint of "anti-rotation + anti-detachment". It can resist axial tension without the need for an additional axial positioning structure, which significantly improves the connection convenience and reliability of detachable pipe fittings.

[0015] Optionally, the fixed end has a first limiting part on the side wall facing the inner tube, and the outer wall of the inner tube has a second limiting part; there are multiple first limiting parts and multiple second limiting parts, with multiple first limiting parts spaced apart circumferentially along the fixed end and multiple second limiting parts spaced apart circumferentially along the inner tube, and each corresponding to the other for locking.

[0016] Multiple sets of circumferentially spaced limiting parts form multi-point contact constraints, which can significantly improve torsional stiffness compared to single-point clamping, evenly distribute circumferential loads, and effectively suppress micro-slippage and wear at the connection interface. It is suitable for power tools that require high-precision positioning, such as precision engraving machines and cutting machines, ensuring that the position of the pipe is stable and without deviation during operation.

[0017] Optionally, the first limiting portion is one of a rib and a groove extending axially along the fixed end, and the second limiting portion is the other of a rib and a groove extending axially along the inner tube, wherein the rib is at least partially embedded in the groove and abuts against its inner wall; the extending directions of the rib, the groove and the notch are parallel to each other.

[0018] The combination of the ribs and grooves not only provides circumferential restraint, but its axial extension structure can also guide the assembly path and reduce the difficulty of centering. Combined with the radial pressing of the constraint parts, a three-dimensional fastening system of "circumferential clamping + radial clamping" is formed, which significantly enhances the sealing of the connection interface, prevents dust from entering the housing from the gap, and improves the dustproof performance and service life of the power tool.

[0019] Optionally, the power tool further includes a restraint member surrounding the outer periphery of the outer tube and pressing the outer tube against the fixed end.

[0020] The restraint component strengthens the radial clamping of the outer tube to the fixed end by applying pressure to the outer periphery, effectively compensating for the problem of increased fit clearance caused by vibration during long-term use, maintaining a continuous and stable clamping force. It is especially suitable for equipment with strong vibration such as concrete drilling machines, avoiding the risk of reduced dust collection efficiency or pipe detachment caused by loose connection, and reducing maintenance frequency.

[0021] Optionally, the outer tube includes a third limiting portion disposed on the outer peripheral wall of the outer tube, the third limiting portion being an annular groove extending circumferentially along the outer tube, and the constraint member being disposed in the annular groove; or, the third limiting portion is two annular ribs spaced apart axially along the outer tube and extending in the circumferential direction of the outer tube, and the constraint member being disposed between the two annular ribs axially along the outer tube.

[0022] The third limiting part, which is composed of annular grooves or convex ribs, provides precise installation positioning for the constraint component, preventing circumferential slippage or axial movement, ensuring that the constraint component is evenly pressed on the outer tube, and avoiding deformation failure caused by local overpressure. This structural design improves the impact resistance of the connection system and is suitable for reliable connection requirements under harsh working conditions.

[0023] Optionally, along the axial direction of the first connecting pipe section, the radial width of the assembly cavity gradually increases from the end closer to the second connecting pipe section to the end farther away from the second connecting pipe section; the outer peripheral wall of the fixed end has a frustum-shaped structure, and its radial dimension is adapted to the changing trend of the assembly cavity along the axial direction.

[0024] The frustum-shaped adapter structure utilizes a gradually widening gap to achieve the dual effects of "easy insertion + self-tightening fastening": the wide gap at the initial insertion stage reduces assembly resistance, and the narrow gap after insertion forms an interference fit, generating a clamping force that increases with the increase of axial load. It combines assembly convenience with connection sealing, effectively preventing dust leakage from the interface during dust collection and improving environmental performance. Attached Figure Description

[0025] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0026] Figure 1 This is a front view of a power tool according to an embodiment of this application;

[0027] Figure 2 yes Figure 1 The diagram shows the assembly of the housing and fittings of the power tool.

[0028] Figure 3 yes Figure 1 A cross-sectional view along the A-A' direction;

[0029] Figure 4 yes Figure 1 A schematic diagram of a portion of the housing structure of the power tool shown;

[0030] Figure 5This is a schematic diagram of a connection end in an embodiment of this application;

[0031] Figure 6 This is another structural schematic diagram of the connecting end in an embodiment of this application;

[0032] Figure 7 yes Figure 5 Enlarged view of region C in the middle;

[0033] Figure 8 yes Figure 5 A side view of the pipe fitting shown;

[0034] Figure 9 yes Figure 8 The diagram shows a cross-sectional view of the pipe fitting along the B-B' direction;

[0035] Figure 10 yes Figure 2 Enlarged view of region A in the middle;

[0036] Figure 11 yes Figure 3 Enlarged schematic diagram of region B in the middle.

[0037] Explanation of reference numerals in the attached figures

[0038] 1. Power tool; 11. Housing; 11a. Accommodation space; 11b. Dust collection port; 111. Fixed end; 111a. First channel; 13. Pipe fitting; 131. Connecting end; 131a. Second channel; 131b. Assembly cavity; 132. First connecting pipe section; 1321. Inner pipe; 1321a. Rib; 1321b. Groove; 1322. Outer pipe; 1322a. Protrusion; 1322b. Notch; 1322c. Limiting groove; 1322d. Annular rib; 133. Second connecting pipe section; 15. Protective cover. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0040] In this embodiment of the invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0041] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0042] Furthermore, the terms "installation," "setting," "equipped with," "opening," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0043] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0044] Power tools used for cutting or grinding objects (such as circular saws) are equipped with tubes, such as dust collection tubes, to collect debris generated during the cutting process. In use, the dust collection tube needs to be fixed to the housing of the power tool. However, in current designs, the fixing effect of the dust collection tube is poor, mainly due to insufficient fastening strength. It is easily loosened by the vibration generated during the operation of the power tool, causing the dust collection tube to detach from the housing of the power tool and rendering its dust collection function ineffective.

[0045] To address the aforementioned technical issues, screws are typically used for fastening. However, this makes disassembly of the dust collection pipe and the power tool's housing inconvenient, hindering power tool maintenance. Furthermore, since dust collection pipes are usually made of plastic, the tightening force of screws can cause stress concentration, leading to deformation or cracking of the pipe. Additionally, screws may strip, causing tightening failure. Besides screws, quick-lock fasteners are also used. While quick-locks facilitate disassembly and assembly, this method results in even greater stress concentration. Prolonged concentrated force on the fixed position of the dust collection pipe accelerates aging and fatigue at the connection points, potentially leading to deformation or breakage.

[0046] One embodiment of this utility model provides an electric tool. By providing an assembly cavity arranged around the first connecting pipe section at the connecting end of the fitting, and extending the assembly cavity along the axial direction of the first connecting pipe section, the fixed end of the housing can be inserted into the assembly cavity. In this way, the first connecting pipe section can be fixed to the fixed end on both the inner and outer surfaces, achieving a double-sided tight fit. This ensures a fixed connection between the fixed end and the fitting, improves the fixing strength of the fitting, and maintains a stable connection between the fitting and the electric tool. This allows the debris generated by the electric tool cutting the target object to continuously enter the fitting body, preventing debris from flying out and polluting the working environment, damaging equipment, and affecting the health of the operator.

[0047] It should be noted that power tools can be circular saws, jigsaws, electric drills, cutting machines, angle grinders or other cutting tools. This application uses a circular saw as an example for illustration, but it is not intended to imply that the following content applies only to this example.

[0048] The following is a detailed description of the implementation details of the connection mechanism in this embodiment. The following content is only for the convenience of understanding and is not necessary for implementing this solution.

[0049] Please see also Figures 1 to 5 , Figure 1 This is a front view of a power tool 1 according to an embodiment of this application. Figure 2 yes Figure 1 The diagram shows the assembly of the housing 11 and the fitting 13 of the power tool 1. Figure 3 yes Figure 1 A cross-sectional view along the A-A' direction. Figure 4 yes Figure 1 The diagram shows a partial structure of the housing 11 of the power tool 1. Figure 5 This is a schematic diagram of a connection end 131 in an embodiment of this application.

[0050] In some embodiments, the power tool 1 includes a housing 11 that forms a receiving space 11a. The housing 11 can be a groove-shaped structure cut axially into a semi-cylindrical or fan-shaped column, or it can be a concave structure extending in an arc. The opening of the groove structure is set as a side plane. Taking the semi-cylindrical groove structure as an example, the upper and lower cylindrical bottom surfaces and the side curved surfaces are retained, and at least part of the side planes connected to the upper and lower bottom surfaces are removed to form a groove-shaped structure.

[0051] In some embodiments, the power tool 1 further includes a working element (not shown) rotatably disposed in the housing 11, with the working element partially housed in a receiving space 11a and partially exposed outside the receiving space 11a, so that the working element can cut or grind a target object while rotating relative to the housing 11. For example, the working element may be a circular saw blade.

[0052] In some embodiments, a dust collection port 11b is provided on the side wall of the housing 11. The dust collection port 11b can be located on the side wall of the housing 11 in the axial direction, or it can be located on a curved wall, or the dust collection port 11b can extend from the circumferential side wall of the housing 11 to the curved wall. The dust collection port 11b can be formed by cutting, and the shape of the dust collection port 11b can be selected according to actual design requirements. This application does not make specific limitations in this regard.

[0053] In some embodiments, the housing 11 has a fixed end 111 corresponding to the dust collection port 11b, and the fixed end 111 forms a first channel 111a. The first channel 111a is interconnected with the dust collection port 11b, and the debris generated by the power tool 1 during operation can enter the first channel 111a through the dust collection port 11b. For example, the fixed end 111 may protrude from the axial sidewall of the housing 11, and may also extend along the axial direction of the housing 11.

[0054] In some embodiments, the working element and the housing 11 can be coaxially arranged. For example, taking an arc-shaped groove housing 11 as an example, the radius of the housing 11 is larger than the radius of the working element. In this way, when the working element rotates relative to the housing 11, there will be no interference between the working element and the housing 11. Since the debris is the part of the target object removed by the working element when it cuts or grinds the target object, the debris will fly out in a direction perpendicular to the rotation of the working element, that is, the debris will fly out in a direction tangential to the working element, and then enter the dust collection port 11b.

[0055] In some embodiments, the power tool 1 further includes a fitting 13, which includes a connecting end 131 and a fitting body (not shown) arranged sequentially. The connecting end 131 is used to detachably connect to the fixed end 111 and communicate with the first channel 111a. The fitting body communicates with the first channel 111a through the connecting end 131. Debris entering the first channel 111a can be collected and stored in the fitting body.

[0056] In some embodiments, the connecting end 131 includes a first connecting pipe section 132 and a second connecting pipe section 133 arranged sequentially. The first connecting pipe section 132 and the second connecting pipe section 133 together form a second channel 131a, which communicates with the first channel 111a. The first connecting pipe section 132 is provided with an assembly cavity 131b arranged along its own circumferential direction and extending axially. The fixed end 111 extends into the assembly cavity 131b to be detachably connected to the first connecting pipe section 132. The second connecting pipe section 133 is connected to the pipe body.

[0057] With this configuration, the first connecting pipe section 132 can be fixed to the fixed end 111 on both the inner and outer surfaces, achieving a double-sided tight fit. This ensures a fixed connection between the fixed end 111 and the pipe fitting 13, improving the fixing strength of the pipe fitting 13 and maintaining a stable connection between the pipe fitting 13 and the power tool 1. This allows the debris generated by the power tool 1 cutting the target object to continuously enter the pipe fitting body, preventing debris from flying out and polluting the working environment, damaging equipment, and affecting the health of the operators.

[0058] Optionally, the first connecting pipe section 132 and the second connecting pipe section 133 can be independently configured, that is, the first connecting pipe section 132 and the second connecting pipe section 133 are separate components, and are fixed by means of welding, screw connection, threaded connection, snap-fit, bonding, heat fusion connection, etc. Alternatively, the first connecting pipe section 132 and the second connecting pipe section 133 can be integrally formed components, such as by injection molding, casting, etc., and this application does not make specific limitations in this regard.

[0059] In some embodiments, the fixed end 111 is provided with a first limiting portion, and the first connecting pipe section 132 is provided with a second limiting portion. When the fixed end 111 is inserted into the assembly cavity 131b, the first limiting portion and the second limiting portion engage with each other, preventing the connecting end 131 from rotating circumferentially relative to the fixed end 111. In other words, by utilizing the cooperation of the first limiting portion and the second limiting portion, the connecting end 131 and the fixed end 111 can be circumferentially fixed to each other. This further improves the fastening strength between the connecting end 131 and the fixed end 111.

[0060] See you again Figure 5In some embodiments, the first connecting pipe section 132 has an inner pipe 1321 and an outer pipe 1322 surrounding the outer periphery of the inner pipe 1321. Both the inner pipe 1321 and the outer pipe 1322 are connected to the second connecting pipe section 133, and the aforementioned assembly cavity 131b is constructed between the inner pipe 1321 and the outer pipe 1322.

[0061] It is understandable that the first limiting part is provided on the fixed end 111, while the second limiting part can be provided more flexibly. For example, the second limiting part can be provided on the inner tube 1321, or on the outer tube 1322, or both the inner tube 1321 and the outer tube 1322 can be provided with the second limiting part. Among them, when both the inner tube 1321 and the outer tube 1322 are provided with the second limiting part, the second limiting part on the inner tube 1321 and the second limiting part on the outer tube 1322 can be the same or different.

[0062] The following will explain the different ways of setting the second limiting part with reference to the accompanying drawings. It should be noted that the different embodiments can be combined arbitrarily without conflict, and the combined embodiments are also within the scope of protection claimed in this application.

[0063] In some embodiments, the fixed end 111 is provided with the aforementioned first limiting portion, and the inner tube 1321 is provided with the aforementioned second limiting portion. It is understood that when the fixed end 111 and the connecting end 131 are assembled and connected, both the fixed end 111 and the inner tube 1321 are located inside the outer tube 1322. By providing the first limiting portion on the fixed end 111 and the second limiting portion on the connecting end 131, when the first and second limiting portions cooperate, both are located inside the outer tube 1322. This makes the appearance of the power tool 1 housing 11 smoother, simpler, and more consistent, improving the overall appearance consistency of the power tool 1. It should be understood that the inner tube 1321 and the second connecting tube segment 133 together construct the aforementioned second channel 13a.

[0064] Optionally, the inner tube 1321 and the outer tube 1322 are independently configured, meaning they are two independent components that are fixedly connected to each other. For example, when the inner tube 1321 and the outer tube 1322 are made of plastic, they can be connected using methods such as bonding, snap-fitting, ultrasonic welding, or hot-melt joining. When the inner tube 1321 and the outer tube 1322 are made of metal, they can be fixed using methods such as welding, snap-fitting, or screwing. In some cases, the inner tube 1321 and the outer tube 1322 can also be integrally formed components, resulting in better structural strength and sealing performance of the first connecting pipe section 132.

[0065] See also Figure 6This is another structural schematic diagram of the connecting end in an embodiment of this application.

[0066] In some embodiments, there are multiple first limiting portions and multiple second limiting portions. The multiple first limiting portions are spaced apart along the circumferential direction of the fixed end 111, while the multiple second limiting portions are spaced apart along the circumferential direction of the inner tube 1321. The first limiting portions and the second limiting portions are mutually engaged in a one-to-one correspondence. In this way, when the fixed end 111 and the connecting end 131 are connected to each other, the mechanical stress can be more evenly distributed, which can improve the fastening effect of the connecting end 131 and prevent stress concentration, thus avoiding deformation or breakage of the fixed end 111 and / or the connecting end 131.

[0067] For example, there can be two first limiting parts, which are arranged on opposite sides of the fixed end 111 in a direction perpendicular to the axial direction of the first connecting pipe section 132. There are also two second limiting parts, which are similarly arranged on opposite sides of the fixed end 111 in a direction perpendicular to the axial direction of the inner tube 1321. When the fixed end 111 is inserted into the assembly cavity 131b, the two first limiting parts and the two second limiting parts are mutually engaged and fixed, at least in the circumferential direction of the inner tube 1321.

[0068] It is understandable that the circumferential direction of the fixed end 111 is the same as the circumferential direction of the first connecting pipe section 132, which is also the circumferential direction of the first connecting pipe section 132.

[0069] In some embodiments, the first limiting part and the second limiting part may each be provided as one. In this way, the structure of the fixed end 111 and the connecting end 131 can be simplified, thereby reducing the manufacturing cost of the power tool 1.

[0070] In some embodiments, the first limiting portion is one of a rib 1321a and a groove 1321b extending axially along the first connecting pipe section 132, and the second limiting portion is the other of the rib 1321a and the groove 1321b extending axially along the first connecting pipe section 132. The rib 1321a is at least partially embedded in the groove 1321b and abuts against the inner wall of the groove 1321b, so that the fixed end 111 is locked and fixed with the inner tube 1321. In this way, the rib 1321a and the groove 1321b can prevent the connecting end 131 from rotating relative to the fixed end 111, and the cooperation of the rib 1321a and the groove 1321b can also achieve a guiding function.

[0071] For example, such as Figure 4 and Figure 6As shown, a rib 1321a is provided on the fixed end 111, and a groove 1321b is provided on the inner tube 1321. When the fixed end 111 is inserted into the assembly cavity 131b, the rib 1321a is at least partially embedded in the groove 1321b. It can be understood that since the fixed end 111 is located between the inner tube 1321 and the outer tube 1322 when the housing 11 and the fitting 13 are connected, the rib 1321a can be provided on the inner wall of the fixed end 111, and the groove 1321b can be provided on the outer wall of the inner tube 1321. Alternatively, the groove 1321b can be provided on the fixed end 111, and the rib 1321a can be provided on the inner tube 1321.

[0072] In some embodiments, when multiple ribs 1321a are provided, the aforementioned groove 1321b can be constructed between any two adjacent ribs 1321a. Similarly, when multiple grooves 1321b are provided, the aforementioned rib 1321a can also be constructed between any two adjacent grooves 1321b at the portion protruding relative to the bottom of the groove 1321b. That is, at this time, multiple ribs 1321a and multiple grooves 1321b are provided on the fixed end 111, and the inner tube 1321 is also provided with multiple ribs 1321a and multiple grooves 1321b. The multiple ribs 1321a on the fixed end 111 and the multiple grooves 1321b on the inner tube 1321 are matched one-to-one, and the multiple grooves 1321b on the fixed end 111 and the multiple ribs 1321a on the inner tube 1321 are matched one-to-one.

[0073] In some embodiments, the first limiting portion may be a protrusion or protrusion (not shown) that protrudes from the fixed end 111 and extends radially along the first connecting pipe section 132, and the second limiting portion may be a first through hole (not shown) that penetrates the inner tube 1321 radially in the first connecting pipe section 132. When the fixed end 111 is inserted into the assembly cavity 131b to connect the housing 11 and the pipe fitting 13, the aforementioned protrusion or protrusion extends into the aforementioned first through hole, causing the protrusion or protrusion to engage with the inner wall of the first through hole. In this way, the connecting end 131 cannot rotate relative to the fixed end 111, nor can it move axially relative to the fixed end 111. That is to say, the above design can both eliminate the rotation of the connecting end 131 relative to the fixed end 111 and fix the connecting end 131 axially.

[0074] It is understood that the aforementioned protrusions or protrusions can be configured as multiple, and the multiple protrusions or protrusions are arranged at intervals along the circumference of the first connecting pipe section 132 and the inner wall of the fixed end 111. The first through holes are correspondingly configured as multiple, and the multiple first through holes are arranged at intervals along the circumference of the first connecting pipe section 132 on the outer wall of the inner pipe 1321.

[0075] See also Figures 7 to 11 , Figure 7 yes Figure 5 Enlarged diagram of region C in the middle. Figure 8 yes Figure 5 The side view of pipe fitting 13 shown is shown. Figure 9 yes Figure 7 The diagram shows a cross-sectional view of pipe fitting 13 along the B-B' direction. Figure 10 yes Figure 2 Enlarged diagram of region A in the middle. Figure 11 yes Figure 3 Enlarged schematic diagram of region B in the middle.

[0076] In some embodiments, a first limiting part is disposed on the outer periphery of the fixed end 111, and a second limiting part is disposed on the outer tube 1322. When the fixed end 111 and the connecting end 131 are connected, the first limiting part located on the outer periphery of the fixed end 111 and the second limiting part located on the outer tube 1322 engage with each other to achieve circumferential fixation of the fixed end 111 and the connecting end 131. Since the first limiting part is disposed on the outer periphery of the fixed end 111 and the second limiting part is disposed on the outer tube 1322, it facilitates visual positioning for the user, allowing for quick positioning and assembly based on the positions of the first and second limiting parts.

[0077] In some embodiments, the first limiting portion is a protrusion 1322a extending radially along the outer tube 1322, which is disposed on the outer wall of the fixed end 111. The second limiting portion is a notch 1322b extending axially along the outer tube 1322. When the fixed end 111 and the connecting end 131 are connected, the protrusion 1322a at least partially extends into the notch 1322b and abuts against the inner wall of the notch 1322b to achieve circumferential fixation between the fixed end 111 and the connecting end 131. The notch 1322b extends axially along the outer tube 1322 and can serve as a guide. Furthermore, by setting the first limiting portion and the second limiting portion as a structurally simple protrusion 1322a and a notch 1322b capable of accommodating the protrusion 1322a, respectively, the structural design difficulty can be reduced, the manufacturing cost of the power tool 1 can be reduced, and sufficient mating strength of the first limiting portion and the second limiting portion can be ensured.

[0078] In some embodiments, multiple protrusions 1322a and notches 1322b can be provided. Multiple protrusions 1322a are spaced apart circumferentially along the fixed end 111, and multiple notches 1322b are spaced apart circumferentially along the outer tube 1322, with each protrusion 1322a and notch 1322b corresponding to the other. Thus, when the fixed end 111 and the connecting end 131 are connected, the relatively arranged and correspondingly fitted limiting portions ensure a more balanced distribution of mechanical stress, improving the fastening strength and preventing stress concentration that could lead to deformation or breakage of the fixed end 111 and / or the connecting end 131.

[0079] For example, in a specific example, both protrusions 1322a and notches 1322b can be provided in pairs. On the radial direction of the outer tube 1322, the two protrusions 1322a are respectively disposed on opposite sides of the fixed end 111, and the two notches 1322b are respectively disposed on opposite sides of the outer tube 1322. The two protrusions 1322a and the two notches 1322b are engaged one-to-one to achieve fixation.

[0080] In some embodiments, the notch 1322b extends axially along the outer tube 1322 and at least partially extends circumferentially along the outer tube 1322. Thus, when the protrusion 1322a enters the notch 1322b axially, the protrusion 1322a can be rotated into the circumferentially extending portion of the notch 1322b by rotating the connecting end 131. The inner wall of the circumferentially extending portion of the notch 1322b limits the protrusion 1322a axially. That is, the circumferentially extending portion of the notch 1322b can be used to axially fix the protrusion 1322a. This allows the notch 1322b to simultaneously fix the protrusion 1322a both axially and circumferentially.

[0081] In some embodiments, the dimension of the notch 1322b in the circumferential direction of the outer tube 1322 is smaller than the dimension of the protrusion 1322a in the circumferential direction of the outer tube 1322. Furthermore, a limiting groove 1322c is formed on at least one inner wall of the notch 1322b, the protrusion 1322a enters the notch 1322b, and at least a portion of the protrusion 1322a can be embedded in the limiting groove 1322c and abut against the inner wall of the limiting groove 1322c. Thus, when the protrusion 1322a enters the notch 1322b, the portion of the outer tube 1322 forming the notch 1322b is opened by the protrusion 1322a. When the protrusion 1322a moves along the extension direction of the notch 1322b to the position of the limiting groove 1322c, the protrusion 1322a is embedded in the limiting groove 1322c, and the portion of the outer tube 1322 forming the notch 1322b returns to its original state, so that the protrusion 1322a is restricted in the limiting groove 1322c. This prevents the protrusion 1322a from continuing to move axially along the first connecting pipe section 132 in the notch 1322b in its natural state. That is, by limiting the protrusion 1322a through the limiting groove 1322c, the first limiting part and the second limiting part can simultaneously achieve circumferential and axial fixation of the fixed end 111 and the connecting end 131.

[0082] For example, the outer tube 1322 has two corresponding inner walls with limiting grooves 1322c forming the notch 1322b, and the two limiting grooves 1322c correspond to each other in the axial direction of the outer tube 1322. When the protrusion 1322a just enters the notch 1322b, the protrusion 1322a opens up the two inner walls of the notch 1322b. When the protrusion 1322a moves to the position corresponding to the two limiting grooves 1322c, since the accommodating space at the limiting grooves 1322c is large, the protrusion 1322a can be accommodated at this position, and the two inner walls forming the notch 1322b are no longer affected by the protrusion 1322a, thus restoring their original shape and allowing the notch 1322b to return to its original size. In this way, the inner walls of the two limiting grooves 1322c can limit the protrusion 1322a, so that the axial position of the protrusion 1322a is fixed.

[0083] In some embodiments, the inner wall of the notch 1322b may be provided with a plurality of limiting grooves 1322c at intervals in the axial direction. In this way, the axial position of the connecting end 131 and the fixed end 111 when they are connected can be changed by inserting the protrusion 1322a into the limiting grooves 1322c at different positions.

[0084] In some embodiments, the second limiting portion on the outer tube 1322 can be configured as a second through hole (not shown) that penetrates the outer tube 1322 radially, and the protrusion 1322a is fixed circumferentially and axially to the outer tube 1322 by passing through the second through hole.

[0085] In some embodiments, the inner wall of the outer tube 1322 may also be provided with a guide groove (not shown) corresponding to the second through hole. The guide groove extends along the axial direction of the outer tube 1322 and communicates with the second through hole. The protrusion 1322a can first enter the guide groove, and under the constraint of the guide groove, move toward the second through hole and extend into the through hole.

[0086] It is understood that the protrusion 1322a and the second through hole can both be set to multiple, with multiple protrusions 1322a being spaced apart circumferentially along the fixed end 111, and multiple second through holes being spaced apart circumferentially along the outer tube 1322, and the protrusions 1322a and the second through holes being set in a one-to-one correspondence.

[0087] In some embodiments, when the fixed end 111 is provided with one of the ribs 1321a or the grooves 1321b, and the inner tube 1321 is provided with the other of the ribs 1321a or the grooves 1321b, the fixed end 111 may also be provided with the aforementioned protrusions 1322a, and the outer tube 1322 may also be provided with corresponding notches 1322b. In this way, the above structures can be used simultaneously to achieve fastening between the fixed end 111 and the connecting end 131, further improving the fastening strength.

[0088] In some embodiments, the engagement between the protrusion 1322a and the notch 1322b can serve as a foolproof, guiding, or positioning structure between the rib 1321a and the groove 1321b. For example, in the circumferential direction of the fixed end 111, the rib 1321a can form a fixed central angle with the protrusion 1322a, such as 0°, 45°, 90°, 180°, or any other arbitrary angle, while the groove 1321b is provided corresponding to the rib 1321a. In this way, when the protrusion 1322a and the notch 1322b are aligned, the rib 1321a and the groove 1321b are also aligned with each other, allowing for smooth assembly between the fixed end 111 and the connecting end 131.

[0089] In some embodiments, the power tool 1 further includes a constraint member (not shown) surrounding the outer periphery of the outer tube 1322, causing the outer tube 1322 to press against the fixed end 111, thereby fixing the fixed end 111 to the connecting end 131. It is understood that the constraint member applies a radial force to the outer tube 1322 on its outer periphery, causing the outer tube 1322 to exert a radial force on the fixed end 111, thereby enabling the inner tube 1321 to clamp the fixed end 111, achieving a fixed connection between the fixed end 111 and the connecting end 131. Optionally, the constraint member may be a cable tie, an elastic ring, or other component capable of being fixed to the outer periphery of the outer tube 1322 and applying a radial force to the outer tube 1322.

[0090] See you again Figures 8 to 11 In some embodiments, the outer tube 1322 may be provided with a third limiting part on the side wall away from the inner tube 1321. The third limiting part is used to fix the position of the constraint member in the axial direction of the outer tube 1322, so that the constraint member can stably apply force to the outer tube 1322 and prevent the constraint member from loosening due to accident.

[0091] For example, the third limiting part can be arranged along the circumference of the outer tube 1322, thereby limiting and fixing the entire constraint member in the circumference of the outer tube 1322.

[0092] In some embodiments, the third limiting part may be an annular groove (not shown) provided along the circumferential direction (i.e., the surrounding direction) of the outer tube 1322, and the constraint member is located in the annular groove when it is fixed on the outer tube 1322.

[0093] In other embodiments, the third limiting part may be two annular ribs 1322d that are spaced apart axially on the outer tube 1322 and extend circumferentially on the outer tube 1322. When the constraint member is fixed to the outer tube 1322, it is located between the two annular ribs 1322d.

[0094] It is understandable that setting the third limiting part as an annular groove or annular rib 1322d and using the annular groove or annular rib 1322d for limiting can reduce the structural design difficulty of the connecting end 131, thereby reducing the manufacturing cost of the power tool 1.

[0095] In some embodiments, in the direction from the first connecting pipe section 132 toward the second connecting pipe section 133, the size of the assembly cavity 131b in the radial direction of the first connecting pipe section 132 gradually decreases, and the size of the fixed end 111 in the radial direction of the first connecting pipe section 132 also gradually decreases. That is, in the direction away from the fixed end 111, the size of the assembly cavity 131b gradually decreases, and the radial thickness of the portion of the fixed end 111 extending into the assembly cavity 131b also gradually decreases. Thus, when connecting the fixed end 111 and the connecting end 131, the size of the portion of the fixed end 111 that initially enters the assembly cavity 131b is smaller than the assembly cavity 131b, thereby reducing the difficulty of inserting the fixed end 111 into the assembly cavity 131b and making the fixed end 111 and the connecting end 131 easier to assemble.

[0096] For example, the inner and / or outer walls of the fixed end 111 can be set as inclined walls, as long as the wall thickness of the fixed end 111 gradually decreases in the direction from the first connecting pipe section 132 to the second connecting pipe section 133. Conversely, the outer wall of the inner pipe 1321 and / or the inner wall of the outer pipe 1322 can be set as inclined walls, as long as the size of the assembly cavity 131b gradually decreases in the direction from the first connecting pipe section 132 to the second connecting pipe section 133.

[0097] In some embodiments, the axial dimension of the assembly cavity 131b is larger than the portion of the fixed end 111 that initially extends into the assembly cavity 131b and fixes the fixed end 111 and the connecting end 131 to each other. In other words, the assembly cavity 131b has a certain axial space allowance relative to the fixed end 111. Thus, even if the outer tube 1322 deforms, reducing the tightening effect on the fixed end 111, the tightening effect on the fixed end 111 can be improved again by continuing to insert the fixed end 111 into the assembly cavity 131b.

[0098] In some embodiments, the fastening strength of the fixed end 111 and the first connecting pipe section 132 can be further improved by interference fit, so as to improve the fastening effect of the housing 11 on the pipe 13.

[0099] In some embodiments, the power tool 1 further includes a protective cover 15, which is rotatably disposed on the housing 11 and partially exposed outside the housing 11. The protective cover 15 can be rotated to be partially received in the receiving space 11a, while the working element portion is located within the protective cover 15. The protective cover 15 is used to cover the portion of the working element to prevent the operator from accidentally putting their hand into the opening of the housing 11 and being cut by the working element while using the power tool 1.

[0100] The electric tools provided by the embodiments of this utility model have been described in detail above. Specific examples have been used in this article to illustrate the principle and implementation of this utility model. The above description of the embodiments is only for the purpose of helping to understand the idea of ​​this utility model. There may be changes in the specific implementation and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An electric tool, comprising a housing forming a receiving space, a working element rotatably connected to the housing, and a tubular component connected to the housing, wherein the housing has a dust collection port communicating with the receiving space and a fixed end corresponding to the dust collection port, the fixed end forming a first channel communicating with the dust collection port, and the tubular component comprising a connecting end connected to the fixed end and a tubular component body connected to the connecting end, the tubular component body communicating with the first channel through the connecting end; characterized in that: The connecting end has a second channel that communicates with the first channel; the connecting end includes an outer tube disposed on the outer periphery of the fixed end, the outer tube having a notch extending axially along the outer tube, the notch being configured to allow radial elastic deformation of the outer tube to achieve an interference fit with the fixed end.

2. The power tool according to claim 1, characterized in that: The connecting end also includes an inner tube surrounding the inner circumference of the outer tube, and an assembly cavity is formed between the inner tube and the outer tube. The fixed end extends into the assembly cavity to connect with the connecting end.

3. The power tool according to claim 2, characterized in that: The connecting end includes a first connecting pipe section and a second connecting pipe section that are connected to each other. The first connecting pipe section is composed of the inner pipe and the outer pipe. The first connecting pipe section is connected to the fixed end, and the second connecting pipe section is connected to the pipe body. The fixed end is provided with a first limiting part, and the first connecting pipe section is provided with a second limiting part. The first limiting part and the second limiting part are mutually engaged to fix the connecting end circumferentially relative to the fixed end.

4. The power tool according to claim 3, characterized in that: The fixed end is provided with a first limiting part on its outer periphery, and the outer tube is provided with a second limiting part; there are two first limiting parts and two second limiting parts. In the circumferential direction of the outer tube, the first limiting parts are respectively provided on opposite sides of the fixed end, and the second limiting parts are respectively provided on opposite sides of the outer tube, and they are locked in a one-to-one correspondence.

5. The power tool according to claim 4, characterized in that: The first limiting part is a protrusion extending radially along the outer tube, and the second limiting part is formed by the inner wall of the notch of the outer tube. The protrusion is at least partially located in the notch and abuts against the inner wall of the notch. In the circumferential direction of the outer tube, the size of the protrusion is larger than the size of the notch. At least one inner wall of the notch is provided with a limiting groove. The protrusion is partially embedded in the limiting groove and abuts against its inner wall to achieve axial fixation.

6. The power tool according to claim 3, characterized in that: The fixed end has a first limiting part on its side wall facing the inner tube, and the outer wall of the inner tube has a second limiting part; there are multiple first limiting parts and multiple second limiting parts, with multiple first limiting parts spaced apart circumferentially along the fixed end and multiple second limiting parts spaced apart circumferentially along the inner tube, and each corresponding to the other for locking.

7. The power tool according to claim 6, characterized in that: The first limiting part is one of a rib and a groove extending axially along the fixed end, and the second limiting part is the other of a rib and a groove extending axially along the inner tube. The rib is at least partially embedded in the groove and abuts against its inner wall. The extending directions of the rib, the groove and the notch are parallel to each other.

8. The power tool according to any one of claims 2-7, characterized in that: The power tool also includes a restraint member surrounding the outer periphery of the outer tube and pressing the outer tube against the fixed end.

9. The power tool according to claim 8, characterized in that: The outer tube includes a third limiting portion disposed on the outer peripheral wall of the outer tube. The third limiting portion is an annular groove extending circumferentially along the outer tube, and the constraint member is disposed in the annular groove; or, the third limiting portion is two annular ribs spaced apart along the axial direction of the outer tube and extending in the circumferential direction of the outer tube, and the constraint member is disposed between the two annular ribs in the axial direction of the outer tube.

10. The power tool according to any one of claims 3-7, characterized in that: Along the axial direction of the first connecting pipe section, the radial width of the assembly cavity gradually increases from the end closer to the second connecting pipe section to the end farther away from the second connecting pipe section; the outer peripheral wall of the fixed end has a frustoconical structure, and its radial dimension is adapted to the changing trend of the assembly cavity along the axial direction.

Images