A portable pump with adjustable length

Abstract

This invention discloses a portable pump with adjustable length, comprising a front rod, a tail rod, and at least one intermediate rod. The front rod has a pump head assembly, and the tail rod has a handle assembly connected to its tail end. The tail end of the front rod has a first connecting piece, one end of the intermediate rod has a first connecting piece, the other end has a second connecting piece, and the front end of the tail rod has a second connecting piece. The first and second connecting pieces are detachably connected. The pump head assembly includes a motor mounting base, a motor, an impeller, and a filter. The motor mounting base is fixedly connected to the front rod, and the motor is fixed within the motor mounting base. The impeller is detachably mounted on the motor's output shaft, and the filter is detachably mounted on the motor mounting base. This invention allows for flexible adjustment of the overall pump length to adapt to different usage scenarios by selecting different numbers of intermediate rods for splicing. Simultaneously, both the impeller and filter adopt a tool-free, detachable structure, facilitating daily cleaning and maintenance for users, significantly improving operational convenience and equipment reliability.

Description

Technical Field

[0001] This invention relates to the field of fluid transport equipment technology, and more specifically, to a portable pump with adjustable length. Background Technology

[0002] Portable pumps, especially handheld or portable liquid transfer pumps, are widely used in various scenarios such as home use, gardening, aquaculture, and emergency drainage. These applications place high demands on the pump's portability, operational flexibility, and ease of maintenance.

[0003] To adapt to water sources of varying depths or different usage environments, some portable pumps with adjustable lengths have emerged in the prior art. For example, patent application CN117413125A discloses a "Portable Pump with Telescopic Tube," whose rod assembly employs a telescopic tube structure, achieving length adjustment through the sliding of the inner tube within the outer tube. In this design, the cable assembly has a spring-shaped section to accommodate length changes, but its length adjustment relies on the telescopic tube structure, which typically requires a complex locking mechanism. Furthermore, the multiple tube sections are nested, requiring the user to overcome both the friction of the multiple tube sections and the resistance of the locking mechanism during adjustment, making operation inconvenient. Additionally, in the pump head assembly of this design, the coarse filter is fixedly mounted to the pump housing, and the impeller is also fixed to the motor's output shaft, making daily cleaning and maintenance inconvenient for users.

[0004] For example, the invention patent with authorization announcement number CN220204115U discloses "A Handheld Water Pump Device with Adjustable Length," which connects the water supply and drainage pipes via a folding connector, and adjusts the length by folding and unfolding the connector. While this solution has a relatively simple structure, its length adjustment is limited to only two states of the folding connector itself, failing to achieve multi-level or continuous fine adjustment. Furthermore, the folding connector has poor stability in the unfolded state and is prone to loosening after prolonged use. Simultaneously, this solution also fails to address the issue of the pump head assembly being inconvenient for users to clean and maintain daily.

[0005] In summary, the existing adjustable-length portable pumps have the following technical problems: First, the length adjustment mechanism either uses a complex telescopic tube structure, which is inconvenient to operate and the locking reliability needs to be improved; or it uses a folding joint structure, which has a limited adjustment range and insufficient stability.

[0006] Secondly, the maintenance convenience of pump head assemblies is generally insufficient. During use, the impeller of portable pumps is prone to entanglement with debris, and the filter also requires regular cleaning or replacement. In existing products, the impeller cannot be disassembled, and the filter is usually fixed to the pump head body in a complicated manner, making it difficult for users to quickly clean and maintain it in daily use, affecting user experience and service life.

[0007] Therefore, providing a portable pump with adjustable length that is compact in structure, easy and reliable in length adjustment, and convenient for daily maintenance is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to provide a portable pump with adjustable length, which can effectively solve the problems of existing portable pumps having fixed length adjustment and difficult pump head assembly cleaning and maintenance.

[0009] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A portable pump with adjustable length includes a front rod, a tail rod, and at least one intermediate rod. The front rod is provided with a pump head assembly, the tail end of the tail rod is connected to a handle assembly, the tail end of the front rod is provided with a first docking member, one end of the intermediate rod is provided with the first docking member and the other end is provided with a second docking member, the front end of the tail rod is provided with the second docking member, and the first docking member and the second docking member are detachably connected. The pump head assembly includes a motor mount, a motor, an impeller, and a filter. The motor mount is fixedly connected to the front rod, the motor is fixed inside the motor mount, the impeller is detachably mounted on the output shaft of the motor, and the filter is detachably mounted on the motor mount.

[0010] In the aforementioned portable pump with adjustable length, the first docking member includes a first threaded sleeve, which is fixed to the ends of the corresponding front rod and the middle rod; the second docking member includes a second threaded sleeve, which is rotatably fitted onto the ends of the corresponding middle rod and the tail rod; the first threaded sleeve and the second threaded sleeve are engaged by threads.

[0011] In the aforementioned portable pump with adjustable length, the first docking member further includes a first support body, which is fixed to the inner wall of the corresponding front rod or middle rod. The first support body includes a first plug and a first water channel through which water flows. The second docking component also includes a second support body, which is fixed to the inner wall of the corresponding intermediate rod or tail rod. The second support body includes a second plug and a second water channel through which water flows. After the first threaded sleeve and the second threaded sleeve are screwed together, the first bracket body and the second bracket body abut and seal, the first water channel and the second water channel are connected, and the first plug and the second plug are connected.

[0012] In the aforementioned portable pump with adjustable length, a sealing element is provided on the end face of the first support body relative to the second support body; or, a sealing element is provided on the end face of the second support body relative to the first support body.

[0013] In the aforementioned portable pump with adjustable length, the seal is integrally molded with the corresponding bracket body through secondary injection molding.

[0014] In the aforementioned portable pump with adjustable length, one of the first plug and the second plug is provided with a positioning rod, and the other is provided with a positioning hole that mates with the positioning rod, wherein the positioning rod is offset from the axis of the corresponding plug.

[0015] In the aforementioned portable pump with adjustable length, the front rod contains a wire electrically connecting the motor and the first plug; the middle rod contains a wire electrically connecting the first plug and the second plug; and the tail rod contains a wire electrically connecting the second plug and electrical components within the handle assembly; the wires are used to transmit power and / or control signals.

[0016] In the aforementioned portable pump with adjustable length, a liquid flow shield is detachably connected to the front end of the motor mounting base.

[0017] In the aforementioned portable pump with adjustable length, the filter includes a flow element and a filter screen. The flow element is snapped onto the inlet of the liquid flow shroud, and the filter screen is snapped onto the liquid flow shroud downstream of the flow element along the liquid flow direction; or, the filter is snapped onto the inlet of the liquid flow shroud.

[0018] In the aforementioned portable pump with adjustable length, the impeller is fixed to the output shaft by a nut, and the output shaft is provided with an external thread that mates with the nut; or, the impeller is fixed to the output shaft by a snap ring, and the output shaft is provided with a slot for the snap ring to engage.

[0019] Compared with the prior art, the advantages of the present invention are: By selecting different numbers of intermediate rods for splicing, users can flexibly adjust the overall length of the pump to adapt to different depths or usage scenarios, overcoming the limitations of traditional fixed-length pumps. The motor is rigidly connected to the front rod via a mounting base, ensuring motor stability during operation and reducing vibration and noise. The motor mounting base, as the core support structure of the pump head assembly, provides a stable mounting foundation for the impeller and filter, facilitating overall assembly and maintenance. The impeller is prone to entanglement with debris during use; its detachable design allows users to easily remove it for cleaning or replacement, significantly reducing maintenance difficulty. The filter intercepts larger impurities in the water, preventing them from entering the impeller or pump body and causing blockage or damage. Its detachable design allows users to easily remove the filter for cleaning or replacement, maintaining continuous and efficient pump operation and avoiding flow reduction or increased motor load due to filter clogging.

[0020] The overall length of the pump can be flexibly adjusted according to needs through the modular design of the intermediate rod; at the same time, the impeller and filter in the pump head assembly adopt a tool-free detachable structure, which allows users to easily perform daily cleaning and maintenance regardless of the length configuration.

[0021] The detachable impeller and filter design allows users to promptly clear blockages, preventing motor overload caused by foreign objects obstructing the pump; while the modular rod structure ensures the pump can accurately reach the working position. This structure improves both operational convenience and equipment reliability.

[0022] Furthermore, the first connecting component includes a first threaded sleeve, which is fixed to the ends of the corresponding front rod and intermediate rod; the second connecting component includes a second threaded sleeve, which is rotatably fitted onto the ends of the corresponding intermediate rod and tail rod; the first threaded sleeve and the second threaded sleeve are engaged by threads. When assembling or disassembling the rods, the user only needs to rotate the second threaded sleeve to lock or loosen them, without the need for tools, making the operation intuitive and effortless. At the same time, the threaded connection has good self-locking properties and tensile strength, which can effectively prevent loosening during use. Compared with the telescopic tube locking mechanism or folding joint in the prior art, the structure is simpler and the stability is higher.

[0023] Furthermore, the first docking component also includes a first support body, which is fixed to the inner wall of the corresponding front rod or middle rod. The first support body includes a first plug and a first water channel through which water flows. The second docking component also includes a second support body, which is fixed to the inner wall of the corresponding middle rod or tail rod. The second support body includes a second plug and a second water channel through which water flows. After the first threaded sleeve and the second threaded sleeve are screwed together, the first support body and the second support body abut and seal, the first water channel and the second water channel are connected, and the first plug and the second plug are docked. When the external threaded sleeve is screwed on, the two support bodies are pressed together, simultaneously completing mechanical fixing, water circuit sealing and connection, and electrical conduction. This design avoids the need for additional external water pipes or wires, making the overall pump structure simple, assembly efficient, and significantly improving the product's integration and reliability. The main body of the bracket is fixed to the inner wall of the rod. Its contact surface is pressed during the thread engagement process, forming a stable axial sealing force. Compared with the method of simply relying on external thread sealing, this structure has a clear sealing surface, controllable pressing force, and better waterproof performance. Moreover, the plug connection is completed in a sealed environment, avoiding poor contact due to water or debris. It is suitable for repeated disassembly and assembly scenarios and can still maintain the connection stability of water and electrical circuits after long-term use.

[0024] Furthermore, a sealing element is provided on the end face of the first support body relative to the second support body; or, a sealing element is provided on the end face of the second support body relative to the first support body. By providing independent sealing elements on the end faces of the first or second support body, when the two support bodies abut against each other under threaded engagement, the sealing elements are compressed and deformed, filling any microscopic unevenness or assembly gaps that may exist between the end faces of the support bodies, forming a reliable axial static seal. This sealing method has a mature structure and controllable sealing pressure, effectively preventing water leakage from the joint and avoiding water loss due to leakage.

[0025] Furthermore, the seal is integrally molded with the corresponding bracket body using a secondary injection molding process. In traditional sealing structures, the seal typically exists as a separate part, requiring manual insertion into the sealing groove during assembly. In applications like portable pumps where users frequently disassemble and assemble the pump body, independent seals are highly susceptible to accidental detachment, displacement, or even loss during disassembly and assembly. By permanently integrating the seal with the bracket body through secondary injection molding, the seal becomes an integral part of the bracket body. Users no longer need to touch or separately install the seal during any operation, completely preventing leakage caused by lost or incorrectly installed seals.

[0026] Furthermore, one of the first plug and the second plug is equipped with a positioning rod, and the other has a positioning hole that mates with the positioning rod. The positioning rod is offset from the axis of the corresponding plug. In the modular rod splicing structure, the first plug and the second plug usually need to be mated in a specific relative orientation to ensure that the internal wires correspond one-to-one. If the user rotates and plugs them in arbitrarily, it may lead to incorrect circuit connection, which may result in the device not working or even short circuits that burn out the motor or control circuit. By setting a positioning rod on one plug and a positioning hole on the other, and by positioning the positioning rod off the plug axis, the two plugs can only be fully inserted in a single angular orientation. This foolproof design fundamentally eliminates the possibility of user misinsertion, eliminating the need for instructions or external markings, and greatly improving the safety and convenience of use.

[0027] Furthermore, the front rod contains wires electrically connecting the motor and the first plug; the middle rod contains wires electrically connecting the first plug and the second plug; and the tail rod contains wires electrically connecting the second plug and electrical components within the handle assembly. These wires are used to transmit power and / or control signals. All wires are arranged inside the rod body, achieving physical isolation from the water flowing through the internal water channels. Compared to external wiring or wiring wrapped around the outside of the rod body, this internal wiring method avoids the risk of electric leakage caused by contact between the wires and water, and prevents the wires from being cut by sharp objects or entangled by debris in the water during operation.

[0028] Furthermore, a flow shield is detachably connected to the front end of the motor mounting base. The flow shield, installed at the front end of the motor mounting base, encloses the impeller and filter within it, preventing large debris from directly impacting the impeller and reducing the risk of impeller damage. The flow shield is typically designed with an inlet and a flow guide structure, allowing water to enter the impeller area via an optimal path, improving the pump's hydraulic efficiency. Additionally, the inlet holes or grilles on the shield can initially intercept excessively large debris, preventing it from directly entangled in the impeller, thus forming a two-stage filtration protection system with the filter.

[0029] Furthermore, the filter includes a flow-through component and a filter screen. The flow-through component is snapped into the inlet of the flow shroud, and the filter screen is snapped into the flow shroud downstream of the flow-through component, along the direction of liquid flow; alternatively, the filter is snapped into the inlet of the flow shroud. The filters in the above solutions are respectively a split-type filter and an integral-type filter. The filtration function is divided into two stages: the flow-through component and the filter screen. The flow-through component performs pre-filtration, mainly intercepting large particles, aquatic plants, leaves, and other coarse debris, protecting the downstream filter screen from rapid clogging. The filter screen performs fine filtration, intercepting smaller particles to ensure the cleanliness of the water entering the impeller. This staged design ensures that most coarse debris is intercepted by the flow-through component, and the filter screen only needs to handle fine particles. The clogging rate of both is significantly reduced, eliminating the need for frequent disassembly and cleaning, and significantly extending the maintenance cycle after a single use. The filter is an integral structure snapped into the inlet of the flow shroud, allowing for cleaning of the entire filter with only one disassembly. Both designs integrate the filter at the inlet of the flow shield, without taking up additional external space in the pump head, thus maintaining the compactness of the pump head assembly. Compared to designs that place the filter inside the rod or have an external filter box, this integrated design reduces the overall size and weight of the pump, avoids additional connecting pipes, reduces the risk of leakage, and makes the pump head assembly more concise and aesthetically pleasing.

[0030] Furthermore, the impeller is fixed to the output shaft by a nut, and the output shaft has an external thread that mates with the nut; alternatively, the impeller is fixed to the output shaft by a snap ring, and the output shaft has a slot for the snap ring to engage. Two specific, reliable, and easy-to-operate impeller fixing methods are provided: nut fixing or snap ring fixing, enabling the impeller to achieve a stable, concentric, rigid connection on the motor's output shaft, while also allowing for quick assembly and disassembly without tools or with simple tools. This design allows users to directly clean or replace the impeller after removing the flow shield and filter, completely solving the problems of non-removable impellers and difficulty in cleaning after debris becomes entangled in existing technologies. Attached Figure Description

[0031] Figure 1 This is an exploded view of a portable pump with adjustable length according to the present invention. Figure 2This is a schematic diagram of the structure of a portable pump assembly with adjustable length according to the present invention; Figure 3 This is a cross-sectional view of the first threaded sleeve and the second threaded sleeve after they are screwed together in this invention; Figure 4 This is a perspective view of the first plug in this invention; Figure 5 This is a perspective view of the second plug in this invention; Figure 6 This is a schematic diagram of the front rod and pump head assembly in this invention; Figure 7 This is an exploded view of the combination of the motor and impeller in the pump head assembly of the present invention; Figure 8 This is a cross-sectional view of the pump head assembly employing the first filter structure in this invention; Figure 9 This is a cross-sectional view of the pump head assembly employing the second type of filter structure in this invention; Figure 10 This is a schematic diagram of the impeller and motor assembly in the present invention. Figure 1 ; Figure 11 This is a schematic diagram of the impeller and motor assembly in the present invention. Figure 2 . Detailed Implementation

[0032] A portable pump with adjustable length includes a front rod 100, a tail rod 200, and at least one intermediate rod 300. The front rod 100 is provided with a pump head assembly 400. The tail end of the tail rod 200 is connected to a handle assembly 500. The tail end of the front rod 100 is provided with a first docking member 600. One end of the intermediate rod 300 is provided with the first docking member 600 and the other end is provided with a second docking member 700. The front end of the tail rod 200 is provided with the second docking member 700. The first docking member 600 and the second docking member 700 are detachably connected. The pump head assembly 400 includes a motor mounting base 410, a motor 420, an impeller 430, and a filter 440. The motor mounting base 410 is fixedly connected to the front rod 100. The motor 420 is fixed inside the motor mounting base 410. The impeller 430 is detachably mounted on the output shaft 421 of the motor 420. The filter 440 is detachably mounted on the motor mounting base 410.

[0033] By selecting different numbers of intermediate rods 300 for splicing, users can flexibly adjust the overall length of the pump to adapt to different depths or usage scenarios, overcoming the limitations of traditional fixed-length pumps. The motor 420 is rigidly connected to the front rod 100 via a mounting base, ensuring the stability of the motor 420 during operation and reducing vibration and noise. The motor mounting base 410, as the core support structure of the pump head assembly 400, provides a stable mounting foundation for the impeller 430 and filter 440, facilitating overall assembly and maintenance. The impeller 430 is prone to entanglement with debris during use; its detachable design allows users to easily remove it for cleaning or replacement, significantly reducing maintenance difficulty. The filter 440 intercepts larger impurities in the water, preventing them from entering the impeller 430 or the pump body and causing blockage or damage. Its detachable design allows users to easily remove the filter 440 for cleaning or replacement, maintaining continuous and efficient pump operation and avoiding flow reduction or increased load on the motor 420 due to filter clogging.

[0034] Thanks to the modular design of the intermediate rod 300, the overall length of the pump can be flexibly adjusted according to needs. Meanwhile, the impeller 430 and filter 440 in the pump head assembly 400 both adopt a tool-free detachable structure, which allows users to easily perform daily cleaning and maintenance regardless of the length configuration.

[0035] The detachable impeller 430 and filter 440 design allows users to promptly clear blockages, preventing motor 420 overload due to foreign object obstruction; while the modular rod structure ensures the pump can accurately reach the working position. This structure improves both operational convenience and equipment reliability.

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] See Figures 1 to 11 This invention provides an embodiment of a portable pump with adjustable length. The portable pump includes: a front rod 100; a tail rod 200; at least one intermediate rod 300; a pump head assembly 400 mounted on the front rod 100; a handle assembly 500 connected to the tail end of the tail rod 200; a first connecting member 600 at the tail end of the front rod 100; a first connecting member 600 at one end of the intermediate rod 300 and a second connecting member 700 at the other end; a second connecting member 700 at the front end of the tail rod 200; the first connecting member 600 and the second connecting member 700 are detachably connected; the pump head assembly 400 includes a motor mounting base 410, a motor 420, an impeller 430, and a filter 440; the motor mounting base 410 is fixedly connected to the front rod 100; the motor 420 is fixed within the motor mounting base 410; the impeller 430 is detachably mounted on the output shaft 421 of the motor 420; and the filter 440 is detachably mounted on the motor mounting base 410.

[0041] The front rod 100 can be a hollow cylindrical tubular structure, made of reinforced polypropylene, glass fiber reinforced polycarbonate or aluminum alloy, and its outer diameter can be set according to actual load-bearing and gripping requirements. The front rod 100 is used to support the pump head assembly 400 and serves as the main support for the front of the whole machine. In this application, the front rod 100 is positioned as the pump head mounting reference and the first-stage water flow inlet channel. The front end of the front rod 100 is connected to the motor mounting base 410 by threaded engagement or snap-fit ​​limiting cooperation, and the rear end is connected to the intermediate rod 300 or the tail rod 200 by the first docking part 600 to establish a detachable mechanical connection and fluid passage.

[0042] The tail rod 200 can be a hollow tubular structure, made of the same engineering plastic or lightweight metal as the front rod 100, with an outer diameter that is the same as or slightly larger than that of the front rod 100. It is used to house the electrical components and power supply lines of the handle assembly 500. The tail end of the tail rod 200 is provided with a standard quick-release interface for axial plug-in connection with the handle assembly 500, or the handle assembly 500 can be directly fixed to the tail end of the tail rod 200. In this application, the tail rod 200 is positioned as the rear support of the whole machine, the human-machine interface support, and the power / signal transmission terminal node. The front end of the tail rod 200 is connected to the intermediate rod 300 or the front rod 100 (when there is no intermediate rod 300) through the second docking part 700 to achieve mechanical connection, water passage and electrical connection. The connection relationship between the tail rod 200 and the handle assembly 500 does not change the cooperation logic between the first docking part 600 and the second docking part 700, but only expands the operation dimension of the whole machine.

[0043] The intermediate rod 300 consists of at least one section, each section having a heterogeneous design at both ends: one end has a first connecting piece 600, and the other end has a second connecting piece 700. The intermediate rod 300 can be a straight pipe section or a pipe section with a preset curvature. Its length can be set according to the application scenario or customized to other sizes according to user needs. This application embodiment does not impose any special limitations on this. In this application scheme, the intermediate rod 300 is positioned as a basic metering unit for length adjustment. Its introduction does not change the functional coupling relationship between the pump head assembly 400 and the handle assembly 500, but only linearly extends the effective working length of the whole machine. When the user needs to adapt to deeper water sources, the number of intermediate rods 300 can be increased sequentially. When used for shallow water intake or storage and carrying, only the front rod 100 and the tail rod 200 can be directly connected, thereby achieving an N-level adjustable adjustment paradigm instead of a two-level or continuously stepless adjustment paradigm. Each intermediate rod 300 is connected in series through the corresponding matching of the first connecting piece 600 and the second connecting piece 700, ensuring that the connection direction is unique and the assembly sequence is clear.

[0044] The first mating part 600 can refer to a mechanical connection structure disposed at the tail end of the front rod 100 or the front end of the intermediate rod 300. Its specific form can be an embedded threaded sleeve, a claw-type boss, a magnetic ring, or an elastic pin hole structure. In this embodiment, it can be a first threaded sleeve 610, which is fixed to the inner wall of the corresponding rod end by injection molding or hot-melt embedding. In this application, the function of the first mating part 600 is to provide an axial positioning reference and a circumferential rotation constraint surface. When it mates with the second mating part 700, it bears the main tensile and bending loads. During the connection with the second mating part 700, the first mating part 600 remains stationary and only participates in the locking action as the object being screwed in, thereby reducing the complexity of user operation. In this application, the first threaded sleeve 610 is provided with external threads.

[0045] The second mating component 700 can refer to a mechanical connection structure disposed at the tail end of the intermediate rod 300 or the front end of the tail rod 200. Its specific form can be a rotatable threaded sleeve, an elastic clamp, a rotary buckle, or an electromagnetic adsorption ring. In this embodiment, it can be a second threaded sleeve 710, which is rotatably fitted around the outer side of the corresponding rod end via a bearing structure or a low-friction bushing. In this application, the second mating component 700 functions as both the operation execution end and the sealing force application end. Its rotational movement synchronously drives the two mating end faces to press together, thereby establishing a dual passageway for water and electricity while completing the mechanical connection. In this application, the second threaded sleeve 710 has an internal thread that engages with the external thread of the first threaded sleeve 610. To achieve the rotational connection between the second docking member 700 and the corresponding rod, an annular groove can be provided along the circumferential direction on the inner wall of the second docking member 700 and an annular groove can also be provided along the circumferential direction on the outer circumferential surface of the rod. Then, an elastic clamp is inserted into the two annular grooves, so that the second docking member 700 can rotate circumferentially relative to the rod without axial movement. Of course, other structures can also be used to achieve the rotational connection between the second threaded sleeve 710 and the rod.

[0046] In the above scheme, the structures of the first docking component 600 and the second docking component 700 can be interchanged.

[0047] The pump head assembly 400 can refer to a fluid drive and primary filtration functional unit integrated at the front end of the front rod 100, which includes a motor mount 410, a motor 420, an impeller 430, and a filter 440. In this application, the pump head assembly 400 is positioned as the core of the whole machine's energy conversion and a fluid inlet protection barrier. All its components are assembled in a detachable manner, and all maintenance actions can be completed without relying on special tools. The pump head assembly 400 and the front rod 100 are rigidly connected to ensure that the vibration transmission path is short and the structural resonance frequency is high during operation, which is beneficial to suppressing low-frequency noise and mechanical fatigue.

[0048] The motor mounting base 410 can be an injection-molded cylindrical bracket, made of materials such as high-temperature resistant and flame-retardant ABS or aluminum alloy. One end of the motor mounting base 410 is threadedly connected and screwed into the head thread of the front rod 100. The other end of the motor mounting base 410 is provided with a motor 420 mounting cavity and an impeller 430 shaft hole. In this application, the motor mounting base 410 is positioned as the mechanical reference and functional integration platform of the pump head assembly 400. It not only bears the radial and axial constraints of the motor 420, but also provides a unified interface for the installation of the impeller 430, the positioning of the filter 440, and the connection of the liquid flow cover 450. The connection interface between the motor mounting base 410 and the front rod 100 is provided with a silicone sealing ring to prevent external moisture from seeping into the interior of the front rod 100 along the thread gap.

[0049] The motor 420 can be a DC brushless motor 420 or a permanent magnet synchronous motor 420. Its housing is fixed to the mounting cavity of the motor mounting base 410 by interference fit or countersunk screws. The output shaft 421 of the motor 420 extends along the axis of the front rod 100 and directly drives the impeller 430 to rotate to generate negative pressure to draw in liquid and pressurize and discharge it. A vibration damping rubber pad is provided between the motor 420 and the motor mounting base 410 to isolate high-frequency vibration from propagating to the rod body. Its power supply line is led to the first docking part 600 through the pre-embedded wire 900 inside the front rod 100, forming an electrical connection path with the wire 900 inside the intermediate rod 300.

[0050] Impeller 430 can be an open or semi-open centrifugal impeller 430, and the material can be modified polypropylene or carbon fiber, etc. The blades are detachably mounted on the output shaft 421 of motor 420. When impeller 430 rotates, it forms a low-pressure zone on the inlet side to draw in liquid and a high-pressure zone on the outlet side to push the liquid to flow along the water channel in the rod body. The detachable connection between impeller 430 and output shaft 421 can be achieved by: locking the back of impeller 430 by engaging the external thread of output shaft 421 with locking nut 460; or by using elastic retaining spring 470 embedded in the annular groove 422 on output shaft 421 to achieve axial limiting. Both methods can be disassembled and assembled by hand or with the help of simple tools without disassembling motor 420 body.

[0051] The filter 440 can be an integral filter element or a split filter assembly. Its installation position is located at the front end of the motor mounting base 410, that is, the last physical interception unit before the liquid flow enters the impeller 430. The filter 440 is positioned as a pre-impurity barrier layer in this application, used to intercept solid impurities such as aquatic plants, silt, and plastic fragments that may damage the impeller 430 or block the flow channel. Its detachable installation method can be: through radial snap-fit ​​with the slot 422 at the front end of the motor mounting base 410; or through axial screw-in thread connection; or through magnetic positioning + elastic clamping structure to achieve quick disassembly. All installation methods ensure that there is a reliable sealing contact surface between the filter 440 and the motor mounting base 410 to prevent unfiltered liquid from bypassing into the impeller 430 cavity.

[0052] By setting a modular rod structure in which the front rod 100, at least one intermediate rod 300 and the tail rod 200 are detachably connected by the first docking part 600 and the second docking part 700, the pump body length can be adjusted in multiple stages, without tools, and with high reliability. This overcomes the technical defects of existing telescopic pipe structures, such as laborious operation, limited adjustment levels of folding joints and poor stability.

[0053] By setting the motor 420 to be rigidly connected to the front rod 100 through the motor mounting bracket 410, the overall structural rigidity and operational stability of the pump head assembly 400 are improved, vibration transmission and noise radiation are reduced, and handheld operation comfort is improved.

[0054] By setting both the impeller 430 and the filter 440 to be detachably mounted on the motor mounting base 410, users can quickly clean the impeller 430 and the filter 440 without the need for professional tools or damage to the overall machine seal. This significantly extends the single-use cycle and overall service life of the equipment, solving the problems of inconvenient maintenance leading to rapid performance degradation and high failure rate in existing products.

[0055] The aforementioned technical solution integrates the front rod 100, middle rod 300, tail rod 200, pump head assembly 400, and handle assembly 500 into a modular rod system. On one hand, the standardized first docking part 600 and second docking part 700 enable physical splicing of any number of sections, transforming length adjustment from a dynamic process of resisting friction to an assembly action of confirming orientation, completely avoiding the risk of jamming in the telescopic structure and the rigidity reduction of the folding structure. On the other hand, through the rigid intermediary of the motor mounting base 410, the motor 420, impeller 430, filter 440, and fluid flow cover 450 are unified into a functional chain that can be disassembled in stages, reducing maintenance operations from professional repairs to user-initiated operations, significantly improving the product's availability throughout its entire lifecycle.

[0056] Based on the above embodiments, the first mating member 600 used in this embodiment includes a first threaded sleeve 610, which is fixed to the ends of the corresponding front rod 100 and intermediate rod 300; the second mating member 700 includes a second threaded sleeve 710, which is rotatably sleeved on the ends of the corresponding intermediate rod 300 and tail rod 200; the first threaded sleeve 610 and the second threaded sleeve 710 are engaged by threads.

[0057] The first threaded sleeve 610 has a cylindrical structure, and its outer wall is provided with an external thread that matches the second threaded sleeve 710. The outer wall is provided with an anti-slip texture or a raised structure to facilitate manual rotation by the user. The first threaded sleeve 610 is used to provide a rigid threaded interface that meshes with the second threaded sleeve 710, and serves as an axial positioning reference when splicing the rods. Its axis coincides with the central axis of the corresponding rod to ensure the coaxial alignment of the water flow channel and the electrical conduction path after splicing. During the splicing process, the first threaded sleeve 610 does not rotate relative to the second threaded sleeve 710, and only bears the axial clamping force and torsional load from the second threaded sleeve 710.

[0058] The second threaded sleeve 710 is a ring-shaped structure made of metal or engineering plastic, with internal threads on its inner wall. The tail of the second threaded sleeve 710 is fixed to the outer circumferential surface of the end of the tail rod 200, the front rod 100, or the intermediate rod 300 by interference fit, adhesive bonding, or embedded injection molding. The second threaded sleeve 710 can be rotatably fitted onto the outer circumferential surface of the end of the intermediate rod 300 or the tail rod 200 through bearings, bushings, or low-friction bushings. Its axial position is constrained by the step or retaining ring structure at the end of the rod body. The second threaded sleeve 710 is used to convert the rotational force applied by the user into an axial locking force, driving itself to screw along the thread of the first threaded sleeve 610, thereby causing the connected rods to move closer to each other and press the seal 800. Its rotational freedom avoids the operational burden of synchronously rotating the entire rod body during splicing.

[0059] The first threaded sleeve 610 and the second threaded sleeve 710 are engaged by screwing in a threaded connection. This thread is a metric fine thread, a trapezoidal thread, or a self-locking thread. The pitch and thread angle are adapted according to the axial locking force, vibration resistance, and manual screwing torque required for the rod connection. After engagement, a mechanical self-locking state is formed between the two threaded sleeves, which will not spontaneously loosen due to vibration or tension under normal operating loads. This thread engagement relationship only acts on the mechanical connection between the rods and does not participate in the water circuit connection or electrical conduction. The functions of the two are decoupled, which is conducive to the independent optimization of the sealing and conductive structures.

[0060] Since the first threaded sleeve 610 is fixed to the end of the rod and the second threaded sleeve 710 is rotatably fitted onto the end of another rod, the user only needs to rotate the second threaded sleeve 710 to complete the connection, avoiding the operational difficulties of simultaneously overcoming the friction and locking resistance of multiple sections in the telescopic tube structure. Because the first threaded sleeve 610 and the second threaded sleeve 710 are connected by a threaded engagement method, they possess inherent self-locking characteristics and high tensile strength. Compared to the ease of loosening in folding joints or the easy failure of telescopic tube locking mechanisms, this significantly improves the long-term stability and reliability of the rod connection. Due to the simple structure of the threaded sleeve, the small number of parts, and the absence of fatigue-prone components such as springs or clips, manufacturing costs and assembly complexity are reduced, improving product yield and after-sales maintenance convenience.

[0061] Based on the above embodiments, the first docking component 600 used in this embodiment further includes a first support body 620, which is fixed to the inner wall of the corresponding front rod 100 or middle rod 300. The first support body 620 includes a first plug 621 and a first water channel 622 through which water flows. The second docking component 700 further includes a second support body 720, which is fixed to the inner wall of the corresponding middle rod 300 or tail rod 200. The second support body 720 includes a second plug 721 and a second water channel 722 through which water flows. After the first threaded sleeve 610 and the second threaded sleeve 710 are screwed together, the first support body 620 and the second support body 720 abut and seal, the first water channel 622 and the second water channel 722 are connected, and the first plug 621 and the second plug 721 are docked.

[0062] The first support body 620 can refer to an annular or disc-shaped support structure fixed to the inner wall of the front rod 100 or the intermediate rod 300. One end of its axial direction is provided with a first plug 621, and the other end is provided with a mounting surface that matches the contour of the inner cavity of the rod. It can be fixed by means of buckles, screws or interference fit. The first support body 620 is used to support the first plug 621 and guide water flow through the first water channel 622. Its material is engineering plastic or lightweight metal, which has corrosion resistance, insulation and a certain rigidity. The first plug 621 is a hole-shaped or sleeve-shaped structure, with elastic contact pieces or spring pins inside, which are used to form reliable electrical contact with the second plug 721 when plugged in. The first water channel 622 is an eccentrically positioned through-hole penetrating the first support body 620. Its cross-sectional shape is circular, elliptical, or polygonal, and its size is set according to the pump's rated flow requirements. The first water channel 622 and the first plug 621 are arranged coaxially or parallel, and they share the same installation reference plane. When the first support body 620 and the second support body 720 abut, the outlet end of the first water channel 622 is aligned with the inlet end of the second water channel 722, forming a continuous flow channel. Water flows from the front rod 100 side through the first water channel 622, and then flows through the second water channel 722 to the middle rod 300 or the tail rod 200 side, realizing cross-segment water passage.

[0063] The second support body 720 can refer to a corresponding annular or disc-shaped support structure fixed to the inner wall of the intermediate rod 300 or the tail rod 200. Its structural form, material, and installation method are adapted to the first support body 620, and it can be fixed by snap-fit, screw, or interference fit. The second support body 720 is used to support the second plug 721 and receive water flow from the first water channel 622. The second plug 721 is a columnar or needle-shaped structure with conductive contacts that matches the first plug 621, used to form reliable electrical contact with the first plug 621 when plugged in. The second water channel 722 is a corresponding through hole penetrating the second support body 720, and its position and size are the same as the first support body 620. Water channels 622 are precisely aligned to ensure that the axes of the two water channels coincide and the end faces fit together without misalignment after screwing them in place. When the first threaded sleeve 610 and the second threaded sleeve 710 are screwed together, the axial clamping force applied by the external threads is transmitted between the first support body 620 and the second support body 720, causing their end faces to fit tightly together, thereby forming a static sealing interface at the connection between the first water channel 622 and the second water channel 722. This sealing interface does not rely on an additional sealing ring, but is achieved by the combined effect of the machining accuracy of the end faces of the two support bodies and the material compression deformation. The mechanical locking action synchronously drives the water circuit connection and the electrical circuit conduction, avoiding the risks of leakage, entanglement and insulation caused by external water pipes and flying wires.

[0064] Since the first support body 620 and the second support body 720 are respectively fixed to the inner walls of adjacent rods and are axially pressed together by the screwing action of the first threaded sleeve 610 and the second threaded sleeve 710, the first water channel 622 and the second water channel 722 are automatically connected and the first plug 621 and the second plug 721 are automatically docked while completing the mechanical connection. This solves the technical problem that relying solely on external threaded connections cannot simultaneously ensure the continuity of water and electricity. Because both the water channels and plugs are built into the rod body and the docking process occurs within a closed cavity, the overall waterproof rating and electrical safety are improved. Since both plug docking and water channel connection are driven by the same screwing action, assembly errors and connection failure risks caused by multi-step operations are avoided.

[0065] Based on the above embodiments, in this embodiment, the first support body 620 is provided with a sealing element 800 on the end face of the second support body 720 relative to the second support body 720; or, the second support body 720 is provided with a sealing element 800 on the end face of the first support body 620 relative to the first support body 620.

[0066] The seal 800 can be an elastomeric seal, such as an O-ring, silicone seal, or fluororubber seal, which has good resilience, water resistance, and aging resistance. The cross-sectional shape of the seal 800 can be circular, rectangular, or D-shaped, which can be set according to the installation space and compression requirements.

[0067] When the sealing element 800 is disposed on the end face of the first bracket body 620 relative to the second bracket body 720, during the engagement of the first threaded sleeve 610 and the second threaded sleeve 710, the first bracket body 620 is axially advanced with the front rod 100 or the intermediate rod 300, and the end face of the first bracket body 620 presses against the end face of the second bracket body 720, causing the sealing element 800 to be axially compressed and elastically deformed, thereby filling the microscopic unevenness, processing error or assembly gap between the end faces of the two bracket bodies, forming a continuous and closed axial static sealing path; the sealing element 800 is fixed to the end face of the first bracket body 620 by interference fit or adhesive bonding to ensure that it does not shift or fall off during assembly and use.

[0068] When the seal 800 is disposed on the end face of the second bracket body 720 relative to the first bracket body 620, under the action of threaded engagement, the second bracket body 720 moves axially with the intermediate rod 300 or the tail rod 200, and its end face presses against the end face of the first bracket body 620, which also causes the seal 800 to be deformed under pressure and achieve end face sealing; at this time, the seal 800 and the end face of the second bracket body 720 are also fixed by interference fit or secondary injection molding to ensure structural integrity and assembly reliability.

[0069] The sealing element 800 and the corresponding bracket body are in the following relationship: the sealing element 800 is arranged circumferentially in the annular groove on the end face of the bracket body, or embedded in the annular protrusion on the edge of the end face; when the two bracket bodies abut, the sealing element 800 is located in the outer area of ​​the communication path between the first water channel 622 and the second water channel 722, completely surrounding the water channel opening, thereby blocking the leakage path radially outward along the end face while the water path is connected; this arrangement ensures that the sealing element 800 does not obstruct the flow of water through the communication between the first water channel 622 and the second water channel 722, and can effectively isolate the water cavity from the external environment, preventing liquid from seeping out from the joint, thereby avoiding the risk of short circuit of motor 420, corrosion of wire 900 or electric shock to user caused by water leakage.

[0070] Because an elastic seal 800 is provided on the mating end face of the first support body 620 or the second support body 720, the seal 800 undergoes controllable deformation and fills the end face gap under the axial clamping force generated by the thread engagement, thereby improving the axial static sealing reliability between the first support body 620 and the second support body 720. Since the seal 800 is located outside the water channel connection path and does not interfere with the flow channel cross-section, it effectively prevents radial leakage of liquid along the end face while ensuring unobstructed water flow. Because the seal 800 only needs to be provided on one side of the support body, the structural complexity and number of assembly steps are reduced, improving mass production consistency and maintenance convenience.

[0071] Based on the above embodiments, the sealing element 800 used in this embodiment is integrated with the corresponding bracket body through secondary injection molding.

[0072] The seal 800 is integrally molded with the corresponding bracket body through secondary injection molding. This can refer to the process where the bracket body substrate is first formed during manufacturing, and then the pre-placed elastic seal 800 (such as silicone, EPDM rubber, or TPE thermoplastic elastomer) is placed in the mold cavity. Through secondary injection molding, the molten plastic is coated and firmly embedded in the outer periphery and bottom surface of the seal 800, forming an inseparable integrated structure. This structure precisely constrains the axial position, radial positioning, and compression deformation space of the seal 800 on the bracket body, ensuring both guidance and self-centering ability during assembly. It also ensures that the seal 800 is subjected to uniform force and its deformation is controllable during the abutment and compression process between the first bracket body 620 and the second bracket body 720, thereby stably achieving the axial static sealing function. This integrated structure does not change the material elasticity and resilience characteristics of the seal 800 itself, and can still adapt to minor gap fluctuations caused by processing tolerances, cumulative assembly errors, or temperature changes.

[0073] The main body of the support can be an injection-molded plastic part, and its material can be polypropylene (PP), polycarbonate (PC), polyoxymethylene (POM) or glass fiber reinforced polyamide (PA6-GF30). Its structure is provided with an annular groove or stepped surface for accommodating and positioning the seal 800. The groove or stepped surface serves as the embedding reference surface and limiting boundary of the seal 800 during the secondary injection molding process. The coating material used for secondary injection molding has good interfacial compatibility with the substrate of the main body of the support or achieves molecular-level bonding by adding compatibilizer, so as to avoid delamination, cracking or peeling.

[0074] Because the seal 800 and the bracket body are integrated through secondary injection molding, the risk of the seal 800 falling off, becoming misaligned, or being lost due to user error during disassembly and assembly is eliminated. Since the position and orientation of the seal 800 on the bracket body are precisely constrained by the mold, its compression path and contact state are highly consistent each time it is connected, improving sealing repeatability and long-term reliability. Because there is no need to assemble the seal 800 separately, the rod connection process is simplified, lowering the threshold for on-site maintenance. This makes it particularly suitable for non-professional users to quickly assemble the pump body outdoors, in humid, or low-light environments.

[0075] In addition, in this embodiment, one of the first plug 621 and the second plug 721 is provided with a positioning rod 623, and the other is provided with a positioning hole 723. The positioning rod 623 is offset from the axis of the corresponding plug.

[0076] The positioning rod 623 can refer to a cylindrical, prismatic, or frustum-shaped protrusion on the end face of the first plug 621 or the second plug 721, whose axis does not coincide with the central axis of the corresponding plug; the positioning hole 723 can refer to a groove or through hole structure on the end face of another plug that matches the shape of the positioning rod 623, used to accommodate and guide the positioning rod 623 into place.

[0077] The positioning rod 623 and the positioning hole 723 cooperate to form a mechanical angle limiting structure. Through an asymmetrical spatial constraint relationship, it restricts the two plugs to be able to complete the insertion only under a defined relative rotational orientation. It works together with the first bracket body 620, the second bracket body 720, the first water channel 622, the second water channel 722, and the threaded connection method. As the user tightens the first threaded sleeve 610 and the second threaded sleeve 710, when the first bracket body 620 and the second bracket body 720 are about to abut, the positioning rod 623 first enters the positioning hole 723 to form a pre-guide and guides the two plugs to the correct mating angle. Then, under the axial pressure applied by the continued threading, the first plug 621 and the second plug 721 complete the rigid insertion along the axial direction. At the same time, the first water channel 622 and the second water channel 722 are precisely connected, and the wire 900 contacts make accurate contact. This linkage ensures that the electrical connection, water channel connection, and mechanical seal are completed synchronously, in the same direction, and in the same position, avoiding contact misalignment, water channel displacement, or partial suspension of the sealing surface due to angle deviation.

[0078] The positioning rod 623 is located on the end face of the first plug 621, and correspondingly, the positioning hole 723 is located on the end face of the second plug 721; or, the positioning rod 623 is located on the end face of the second plug 721, and correspondingly, the positioning hole 723 is located on the end face of the first plug 621; both arrangements can achieve the same foolproof function, and can be selected according to the convenience of mold processing, the consistency of injection molding, or the need to optimize the lead-out path of the wire 900. This application embodiment does not limit this.

[0079] One of the first plug 621 and the second plug 721 is provided with a positioning rod 623 that is off-axis, and the other is provided with a matching positioning hole 723. Therefore, there is only a certain relative rotation angle during the insertion process, which avoids wire misconnection 90°, water channel offset or seal failure caused by misrotation. This improves the safety, fault tolerance and reliability of the rod splicing operation and solves the core problem of preventing misconnection of electrical connection.

[0080] Based on the above embodiments, in this embodiment, the front rod 100 is provided with a wire 900 that electrically connects the motor 420 and the first plug 621; the middle rod 300 is provided with a wire 900 that electrically connects the first plug 621 and the second plug 721; and the tail rod 200 is provided with a wire 900 that electrically connects the second plug 721 and the electrical components in the handle assembly 500. The wires 900 are used to transmit power and / or control signals.

[0081] The wire 900 inside the front rod 100 can be a multi-core insulated copper wire 900, one end of which is electrically connected to the terminal of the motor 420, and the other end is electrically connected to the electrode pin of the first plug 621. The wire 900 is laid along the axial cavity of the front rod 100 and can be fixed by snap-fit ​​limiting, adhesive fixing or embedded in a wire groove preset in the inner wall of the rod. Its cross-sectional area can be set according to the rated power of the motor 420 and the transmission distance. The function of the wire 900 is to transmit the driving power or control command provided by the handle assembly 500 to the motor 420, and at the same time support the return of the operating status feedback signal of the motor 420.

[0082] One end of the wire 900 provided inside the intermediate rod 300 is electrically connected to the electrode pin of the first plug 621, and the other end is electrically connected to the electrode pin of the second plug 721. The wire 900 extends along the axial cavity of the intermediate rod 300, and both ends are connected to the corresponding plug pins by crimping terminals or welding. The function of the wire 900 is to achieve continuous electrical signal conduction between the first plug 621 and the second plug 721 after adjacent rods are spliced, so that current or control signals can be stably transmitted across segments.

[0083] One end of the wire 900 inside the tail rod 200 is electrically connected to the electrode pin of the second plug 721, and the other end is electrically connected to the input / output interface of the battery, switch, control circuit board or wireless communication module inside the handle assembly 500. The function of the wire 900 is to transmit power energy and human-machine operation commands from the handle assembly 500 to the pump head side, and to support the reverse uploading of feedback information such as sensor data and fault alarms.

[0084] The conductor 900 is used to transmit power and / or control signals, where power can refer to low-voltage DC drive power, which is compatible with a built-in lithium battery or an external power adapter; control signals can refer to PWM speed control signals, start / stop commands, direction switching signals, temperature / current sampling signals, or Bluetooth / WiFi communication protocol data frames.

[0085] Because the wires 900 are embedded inside the front rod 100, middle rod 300, and tail rod 200, respectively, and connect the motor 420 to the first plug 621, the first and second plugs 721, and the second plug 721 to the electrical components inside the handle assembly 500, the risks of leakage, cuts, and entanglement associated with external wires are avoided. Since the wires 900 are physically isolated from the water channels within each rod, the electrical insulation reliability and the overall waterproof rating are improved. Because the plug connection and mechanical locking are completed simultaneously, circuit continuity is ensured regardless of the length configuration, enhancing the system's modular adaptability and operational flexibility.

[0086] For the pump head assembly 400, the specific structure is as follows: the front end of the motor mounting base 410 used in this embodiment is detachably connected to the liquid flow cover 450.

[0087] The fluid flow cover 450 is an annular cylindrical structure with a connection interface at its rear end that matches the front end of the motor mounting base 410. This connection interface can be a snap-fit ​​structure, a threaded structure, or a magnetic structure. For example, the snap-fit ​​structure includes elastic protrusions and corresponding grooves evenly distributed along the circumference. The protrusions undergo elastic deformation during assembly and snap into the grooves to achieve axial limiting and radial positioning. The threaded structure includes an internal thread on the inner wall of the fluid flow cover 450 and an external thread on the outer circumference of the motor mounting base 410. The two threads are screwed together to form a tight connection. The magnetic structure includes an array of permanent magnets embedded in the connecting end face of the fluid flow cover 450 and the front end face of the motor mounting base 410. Quick alignment and connection are achieved through the attraction of opposite magnetic poles. This application embodiment does not impose any special limitation on the specific connection form between the fluid flow cover 450 and the motor mounting base 410.

[0088] The liquid flow shield 450 is used to enclose the impeller 430 and the filter 440, serving as an external protective cover for the pump head assembly 400. It provides the first-level physical interception and flow guidance constraint in the liquid suction path. Its front end is provided with a water inlet, which is a ring-shaped grid, a multi-hole array, or a strip slit structure. It is used to initially intercept large debris such as aquatic plants, leaves, and gravel, preventing them from directly impacting the impeller 430 and causing entanglement, scratches, or mechanical jamming.

[0089] The flow shield 450 and the motor mounting base 410 form a detachable connection, which is compatible with the detachable installation method of the impeller 430: when the flow shield 450 is removed, the impeller 430 is exposed to the operating view, and the user can clean the filter 440 and clean or replace the impeller 430 without disassembling the internal structure of the pump head; this linkage disassembly path makes maintenance actions concentrated on a single operating interface, significantly shortening maintenance time and lowering the operating threshold; the flow shield 450 itself does not participate in the fluid pressurization process, but only undertakes the functions of protection, flow guidance and support, so its material is engineering plastic, lightweight aluminum alloy or composite material.

[0090] Because the flow shield 450 is detachably connected to the front end of the motor mount 410, it provides an independent and convenient access channel for the impeller 430 and the filter 440 without compromising the overall structure of the pump head. Since the flow shield 450 has an inlet grille and an inner wall guide structure at its front end, coarse filtration and water flow rectification are simultaneously achieved during suction. Because the flow shield 450 and the motor mount 410 use a non-permanent connection, it supports high-frequency, low-tool-dependent daily maintenance, solving the technical problems of difficult maintenance, easy clogging, and difficult cleaning of the pump head assembly 400 in the prior art.

[0091] Based on the above embodiments, the filter 440 used in this embodiment includes a flow passage 441 and a filter screen 442. The flow passage 441 is snapped into the inlet of the liquid flow cover 450, and the filter screen 442 is snapped into the liquid flow cover 450 downstream of the flow passage 441 along the liquid flow direction; or, the filter 440 is snapped into the inlet of the liquid flow cover 450.

[0092] The filter 440 is used to intercept impurities in the liquid and prevent them from entering the pump body and causing the impeller 430 to become entangled or the channel to become blocked; its structure can be configured as either a split type or an integral type.

[0093] When the filter 440 is a split structure, the flow-through component 441 is a plastic or metal ring-shaped or cylindrical component with a through-hole array or grid structure. Its outer contour matches the shape of the inner wall of the inlet of the liquid flow cover 450. It can be detachably snapped on by elastic buckles, ribs and grooves, or interference fit. The flow-through component 441 is used for primary filtration before the liquid enters the pump head, intercepting large particles such as water plants, leaves, and plastic fragments, reducing the load on the subsequent fine filtration unit. The snap-on relationship between the flow-through component 441 and the inlet of the liquid flow cover 450 allows it to be quickly removed along with the liquid flow cover 450, making it convenient for users to clean or replace it separately.

[0094] Filter screen 442 is a metal wire mesh, nylon mesh, or non-woven filter material with a microporous structure. Filter screen 442 is positioned on the inner wall of the liquid flow hood 450 downstream of the flow passage component 441 along the liquid flow direction, and is detachably snapped in place via a slot 422, a spring clip 470, or a heat-fused protrusion. Filter screen 442 is used for secondary fine filtration of the liquid after passing through the flow passage component 441, intercepting tiny particles such as sediment, algae spores, and fine fibers. The flow passage component 441 and filter screen 442 work together to form a staged filtration path: the flow passage component 441 performs the coarse filtration task. The filter screen 442 is protected from rapid clogging, and the two components have a clear division of labor, extending the maintenance cycle after a single use. This hierarchical cooperation ensures that the liquid passes through physical interception stages before entering the impeller 430, forming a stable, low-resistance, and high-pollution-holding filtration process. The filter screen 442 is installed downstream of the flow-through component 441, ensuring that the liquid immediately enters the fine filtration section after completing the primary interception, preventing unfiltered liquid from bypassing. The snap-fit ​​method of the filter screen 442 is compatible with the structure of the flow hood 450, supporting tool-free quick installation and removal, improving user maintenance efficiency.

[0095] The filter 440 is integrated into the inlet of the flow hood 450 by snapping it into the flow element 441 and the filter screen 442 into a single structure. It adopts a double-layer composite filter screen, a nested filter cartridge, or a composite cover with a coarse filter grid and a fine filter screen that is injection molded in one piece. The integrated filter 440 is connected to the inlet of the flow hood 450 in one go through a unified snap-fit ​​structure. Its function is to provide an integrated solution that combines coarse and fine filtration, which simplifies the assembly structure and user operation steps while ensuring filtration effect. This solution is suitable for application scenarios with relatively simple impurity types and low maintenance frequency requirements. Its snap-fit ​​relationship with the flow hood 450 also allows for quick removal and cleaning of the whole machine without disassembling other pump head components 400. Its outer contour is consistent with the inlet of the flow hood 450, without increasing the external size of the pump head, and maintaining the compactness and consistency of the overall pump.

[0096] Because the filter 440 adopts a split structure, with the flow-through component 441 and the filter screen 442 respectively undertaking the tasks of coarse filtration and fine filtration, the clogging rate of a single filter element is reduced, extending the maintenance cycle after each use. Since the filter 440, whether as a whole or in parts, is installed at the inlet of the flow shroud 450 via a snap-fit ​​method, users can disassemble and assemble it without tools, improving the convenience and safety of maintenance operations. Because the filter 440 is integrated into the water inlet path inside the flow shroud 450, without the need for additional external filter boxes or piping connections, leakage risks and increased overall pump size are avoided, maintaining the compactness and portability of the pump head.

[0097] Based on the above embodiments, in this embodiment, the impeller 430 is fixed to the output shaft 421 by a nut 460, and the output shaft 421 is provided with an external thread that mates with the nut 460; or, the impeller 430 is fixed to the output shaft 421 by a snap ring 470, and the output shaft 421 is provided with a slot 422 for the snap ring 470 to engage.

[0098] The impeller 430 is fixed to the output shaft 421 by a nut 460. This can be achieved by the impeller 430 having a through hole at its center, which is fitted onto the output shaft 421 of the motor 420. The outer circumferential surface of the output shaft 421 has an axially extending external thread section. The nut 460 is screwed onto this external thread section and presses against the end face of the impeller 430, thereby achieving axial positioning and circumferential synchronous transmission of the impeller 430 on the output shaft 421. The nut 460 can be a hexagonal nut 460 or an internal hexagonal head nut 460. The locking nut 460 or a locking nut with an anti-loosening structure can be made of stainless steel, brass, or engineering plastic, depending on the pump's working pressure, speed, and corrosion resistance requirements. A flat washer or elastic washer can be placed between the nut 460 and the impeller 430 end face to enhance pre-tightening stability. Alternatively, the washer can be omitted, and the fixing can be achieved solely by the thread self-locking. This fixing method ensures high concentricity and torsional stiffness while allowing users to complete the assembly and disassembly using only a regular wrench or an Allen wrench, without the need for special tools.

[0099] The impeller 430 is fixed to the output shaft 421 by a retaining ring 470. This can mean that after the impeller 430's central through-hole is fitted onto the output shaft 421, the elastic retaining ring 470 is embedded into a pre-set annular groove 422 on the output shaft 421. The outer diameter of the retaining ring 470 is larger than the inner diameter of the through-hole of the impeller 430, thus providing axial protection for the impeller 430. The retaining ring 470 can be a standard E-type retaining ring, a C-type open retaining ring, or a wave-shaped elastic retaining ring, and its material can be spring steel, stainless steel, or high-temperature resistant engineering plastic. The groove 422... The axial width and depth must match the selected snap ring 470 specification, and the chamfer of the slot should facilitate the insertion of the snap ring 470. This fixing method does not require thread engagement, has high assembly efficiency, and is suitable for maintenance scenarios where the impeller 430 needs to be frequently replaced. The fit between the snap ring 470 and the slot 422 is an interference constraint, which does not rely on friction to transmit torque. The impeller 430 can still achieve circumferential positioning on the output shaft 421 through a key connection or spline structure, or achieve synchronous rotation by relying on the slight interference fit between the inner hole of the impeller 430 and the output shaft 421.

[0100] Because the impeller 430 and output shaft 421 are connected by two reversible, non-destructive, mechanical methods—a nut 460 + external thread or a snap ring 470 + slot 422—the impeller 430 can be quickly, reliably, and repeatedly disassembled and assembled without disassembling the motor 420 body. Since both methods are based on an extension of the output shaft 421 body structure, without introducing additional brackets, flanges, or quick-release interfaces, the axial dimensions and weight of the pump head are not increased, maintaining the compact and portable structure defined in this application. The nut 460 solution provides higher axial locking force, and the snap ring 470 solution provides faster assembly response; together, they cover different operating conditions and user needs, thus comprehensively solving the maintenance difficulties caused by the non-removable impeller 430 in the prior art.

[0101] The working process and principle of this application are as follows: the user selects the required number of intermediate rods 300 according to the target water source depth: when only short-distance water retrieval is required, the first connecting piece 600 at the tail end of the front rod 100 is directly screwed into the second connecting piece 700 at the front end of the tail rod 200 to form the shortest configuration; when the working distance needs to be extended, the first connecting piece 600 at the front end of the first section of intermediate rod 300 is first connected to the tail end of the front rod 100, then the second connecting piece 700 at its tail end is connected to the first connecting piece 600 at the front end of the second section of intermediate rod 300, and so on, until finally the second connecting piece 700 at the tail end of the last section of intermediate rod 300 is connected to the front end of the tail rod 200; The docking process is completed by rotating the second docking piece 700, while the first docking piece 600 remains stationary. After docking, the end faces of the two docking pieces are pressed together to form a mechanical locking state. At this time, the front rod 100, the middle rod 300, and the tail rod 200 together form a continuous hollow channel. Liquid enters from the filter 440, passes through the inner cavity of the motor mounting base 410 and the water channels of each rod segment, and is finally discharged through the outlet controlled by the handle assembly 500. After the motor 420 is powered on, it drives the impeller 430 to rotate, generating a fluid pressure difference to achieve continuous water pumping. Both the impeller 430 and the filter 440 can be removed for cleaning or replacement without disassembling the motor mounting base 410.

[0102] For example, in a garden irrigation scenario, a user needs to draw water from a 1.2 m deep water tank. The recommended configuration is a three-section structure: a front rod 100 + a 300 mm middle rod 300 + a tail rod 200. First, align the first connecting piece 600 at the front end of the middle rod 300 with the tail end of the front rod 100. Manually rotate the second connecting piece 700 at the tail end of the middle rod 300. When the second connecting piece 700 cannot be turned, confirm the connection is in place. Then, align the second connecting piece 700 at the tail end of the middle rod 300 with the front end of the tail rod 200 and rotate it to lock it in place. Next, insert the handle assembly 500 into the tail end of the tail rod 200 and fasten it. Turn on the power; the motor 420 starts, the impeller 430 rotates, and the water... After being initially intercepted by filter 440, large particles of impurities enter the impeller 430 flow channel. Under the action of centrifugal force, the impeller accelerates and pressurizes, and is transported to the outlet along the continuous inner cavity of front rod 100 → middle rod 300 → tail rod 200. After use, the user loosens the second connecting piece 700 in sequence, separates each rod section, and stacks them for storage. If the pumping flow rate is found to decrease, the liquid flow cover 450 is removed, the filter 440 is taken off to rinse the filter screen, the locking nut 460 of impeller 430 is loosened, and impeller 430 is removed to remove tangled aquatic plants. The whole process does not require special tools.

[0103] Through the above technical solution, this application adopts a modular rod structure in which the front rod 100, at least one intermediate rod 300, and the tail rod 200 are detachably connected via the first connecting piece 600 and the second connecting piece 700. This achieves multi-stage, tool-free, and highly reliable adjustment of the pump body length, overcoming the technical defects of existing telescopic pipe structures, such as laborious operation, limited adjustment levels of folding joints, and poor stability. Since the motor 420 is rigidly connected to the front rod 100 via the motor mounting base 410, the overall structural rigidity and operational stability of the pump head assembly 400 are improved, vibration transmission and noise radiation are reduced, and handheld operation comfort is enhanced. Because the impeller 430 and filter 440 are both detachably mounted on the motor mounting base 410, users can quickly clean the impeller 430 and filter 440 without the aid of professional tools or damage to the overall machine seal. This significantly extends the single-use cycle and overall service life of the equipment, solving the problems of inconvenient maintenance leading to rapid performance degradation and high failure rates in existing products.

[0104] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A portable pump with adjustable length, characterized in that, It includes a front rod, a tail rod, and at least one intermediate rod. The front rod is provided with a pump head assembly. The tail end of the tail rod is connected to a handle assembly. The tail end of the front rod is provided with a first docking member. One end of the intermediate rod is also provided with a first docking member and the other end is provided with a second docking member. The front end of the tail rod is also provided with a second docking member. The first docking member and the second docking member are detachably connected. The pump head assembly includes a motor mount, a motor, an impeller, and a filter. The motor mount is fixedly connected to the front rod, the motor is fixed inside the motor mount, the impeller is detachably mounted on the output shaft of the motor, and the filter is detachably mounted on the motor mount.

2. The portable pump with adjustable length according to claim 1, characterized in that, The first mating component includes a first threaded sleeve, which is fixed to the ends of the corresponding front rod and the middle rod; the second mating component includes a second threaded sleeve, which is rotatably fitted onto the ends of the corresponding middle rod and the tail rod; the first threaded sleeve and the second threaded sleeve are engaged by threads.

3. A portable pump with adjustable length according to claim 2, characterized in that, The first docking component further includes a first support body, which is fixed to the inner wall of the corresponding front rod or middle rod. The first support body includes a first plug and a first water channel through which water flows. The second docking component also includes a second support body, which is fixed to the inner wall of the corresponding intermediate rod or tail rod. The second support body includes a second plug and a second water channel through which water flows. After the first threaded sleeve and the second threaded sleeve are screwed together, the first bracket body and the second bracket body abut and seal, the first water channel and the second water channel are connected, and the first plug and the second plug are connected.

4. A portable pump with adjustable length according to claim 3, characterized in that, The first support body has a sealing element on its end face relative to the second support body; or, the second support body has a sealing element on its end face relative to the first support body.

5. A portable pump with adjustable length according to claim 4, characterized in that, The sealing element is integrally molded with the corresponding bracket body through secondary injection molding.

6. A portable pump with adjustable length according to claim 3, characterized in that, One of the first plug and the second plug is provided with a positioning rod, and the other is provided with a positioning hole that cooperates with the positioning rod. The positioning rod is offset from the axis of the corresponding plug.

7. A portable pump with adjustable length according to claim 3, characterized in that, The front rod contains a wire electrically connecting the motor and the first plug; the middle rod contains a wire electrically connecting the first plug and the second plug; the tail rod contains a wire electrically connecting the second plug and the electrical components in the handle assembly; the wires are used to transmit power and / or control signals.

8. A portable pump with adjustable length according to claim 1, characterized in that, The front end of the motor mounting base is detachably connected to a liquid flow cover.

9. A portable pump with adjustable length according to claim 8, characterized in that, The filter includes a flow element and a filter screen. The flow element is snapped into the inlet of the liquid flow hood, and the filter screen is snapped into the liquid flow hood downstream of the flow element along the liquid flow direction; or, the filter is snapped into the inlet of the liquid flow hood.

10. A portable pump with adjustable length according to claim 1, characterized in that, The impeller is fixed to the output shaft by a nut, and the output shaft has an external thread that mates with the nut; or, the impeller is fixed to the output shaft by a snap ring, and the output shaft has a slot for the snap ring to engage.

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