Handheld high-pressure cleaning machine

Abstract

A handheld high-pressure cleaning machine, comprising a pump unit (4), an electric motor assembly (1), a transmission assembly (2) and a plunger (88), wherein the transmission assembly (2) is provided with a box housing (21), the plunger (88) is at least partially located in the box housing (21) and extends into the pump unit (4), and the transmission assembly (2) drives the plunger (88) to reciprocate in the pump unit (4) so as to pump water; the transmission assembly (2) comprises a pressurizing mechanism (80) abutting against the plunger (88), wherein the pressurizing mechanism (80) is located in the box housing (21), the pump unit (4) is provided with a pressure chamber (42) for accommodating the plunger (88), and the pressurizing mechanism (80) and the pressure chamber (42) are located at two ends of the plunger (88). The pressurizing mechanism (80) has a first stage for storing energy and a second stage for releasing energy, and in the first stage, the transmission assembly (2) drives the plunger (88) to store energy for the pressurizing mechanism (80); and in the second stage, the transmission assembly (2) drives the plunger (88) to pressurize the pressure chamber (42), and the pressurizing mechanism (80) applies, to the plunger (88), an acting force towards the pressure chamber (42). The handheld high-pressure cleaning machine has an extremely high working efficiency.

Description

Handheld high-pressure cleaner

Technical field

[0001] The present invention relates to the field of electric tools, and in particular to a handheld high-pressure cleaning machine used for cleaning vehicles, courtyards, floors, etc. [Background Technology]

[0002] Washing machines are widely used for cleaning vehicles, courtyards, floors, etc. Their working principle is generally to use a motor assembly to drive the plunger to reciprocate, forming high-pressure water in the pump assembly and spraying it outward through the nozzle to achieve the purpose of flushing items; the single-cylinder pump in the washing machine has the characteristics of simple structure and low cost, which makes it very popular among users.

[0003] The working principle of a cleaning machine using a single-cylinder pump is as follows: the motor assembly drives the plunger to reciprocate in the pressure chamber of the single-cylinder pump under the energy supply of the power source; the plunger has a first stage of squeezing the pressure chamber and a second stage of moving away from the pressure chamber, and only in the first stage does the plunger pressurize the water in the pressure chamber, that is, during the reciprocating motion of the plunger, half of the cycle does work in the pressure chamber, while the other half of the cycle does not do work, resulting in the overall low efficiency of the single-cylinder pump.

[0004] In addition, the output pressure and flow of the cleaning machine are directly affected by the motor components. If you want to obtain higher output pressure and flow, the performance requirements for the motor components will also be higher, but this will undoubtedly increase the cost of the motor components, thereby increasing the cost of the entire machine.

[0005] In view of this, it is indeed necessary to provide an improved handheld high-pressure cleaning machine to overcome the defects of the prior art.

[0006] [Summary of the invention]

[0007] In view of the shortcomings of the prior art, an object of the present invention is to provide a handheld high-pressure cleaning machine with high efficiency and low cost.

[0008] The present invention solves the problems of the prior art by adopting the following technical solutions: A handheld high-pressure cleaning machine comprises a pump unit having a water inlet and a water outlet, a motor assembly, a transmission assembly connected to the motor assembly, and a plunger driven by the transmission assembly, wherein the transmission assembly has a housing, the plunger is at least partially located in the housing and extends into the pump unit, and the transmission assembly drives the plunger to reciprocate in the pump unit to perform water pumping operation; the transmission assembly includes a booster mechanism abutting against the plunger, the booster mechanism is located in the housing, the pump unit has a pressure chamber for accommodating the plunger, the booster mechanism and the pressure chamber are located at both ends of the plunger, and the booster mechanism has a first stage for storing energy and a second stage for releasing energy. In the first stage, the transmission assembly drives the plunger to store energy in the booster mechanism; in the second stage, the transmission assembly drives the plunger to pressurize the pressure chamber, and the booster mechanism applies a force on the plunger toward the pressure chamber.

[0009] A further improvement is as follows: the plunger includes a guide rod protruding from the end toward the boosting mechanism, the transmission assembly includes an insert installed on the box shell, the boosting mechanism is a spring, one end of the boosting mechanism is sleeved on the guide rod, and the other end is pressed against the insert.

[0010] A further improved solution is: the insert includes a base plate, a clamping arm connected to the base plate, and a step surface provided at the connection between the base plate and the clamping arm, the step surface abuts against the box shell, one end surface of the clamping arm abuts against the boosting mechanism, and the other end surface abuts against the inner wall of the box shell.

[0011] A further improved solution is: the insert includes a notch that passes through the base plate, and the notch is at least partially exposed to the outside of the box shell.

[0012] A further improved solution is: the clamping arm is arranged in a U shape, and the two arms of the clamping arm abut against the boosting mechanism.

[0013] A further improved solution is: the box shell includes a movable cavity penetrating along the first axial direction, a mounting opening penetrating along a direction perpendicular to the first axial direction, and a stop portion arranged in the mounting opening, and the step surface abuts against the stop portion.

[0014] A further improved solution is: the box shell includes reinforcing ribs arranged on the outer peripheral surface, the installation opening is located at the end of the box shell, and the reinforcing ribs are covered on the outside of the installation opening.

[0015] A further improvement is as follows: the transmission assembly includes a reduction mechanism connected to the motor assembly and an output member connected to the reduction mechanism, and the output member drives the plunger to reciprocate; the reduction mechanism includes planetary gears connected to the motor shaft of the motor assembly and a ring gear engaged with the planetary gears, and fasteners are passed through the box shell and the ring gear to lock the box shell and the ring gear.

[0016] A further improvement is as follows: the ring gear includes a ring gear body meshing with the planetary gear, a lip protruding axially from the end face of the ring gear body, and a clamping column protruding radially from the outer periphery of the ring gear body, the lip abuts against the inner side of the casing, and fasteners are passed through the casing and the clamping column to fix the casing and the ring gear.

[0017] A further improved solution is: the plunger has a first axis, the motor assembly has a second axis, the first axis is perpendicular to the second axis, in the first stage, the water inlet end is opened and the water outlet end is closed, and the plunger moves away from the pressure chamber; in the second stage, the water inlet end is closed and the water outlet end is opened, and the plunger moves close to the pressure chamber.

[0018] Compared with the prior art, the present invention has the following beneficial effects: by arranging a boosting mechanism at the end of the plunger away from the pump unit, the plunger can store energy in the boosting mechanism during the half-cycle when it is not working, and the stored energy is released to the plunger during the half-cycle when it is working, thereby greatly improving the working efficiency of the handheld high-pressure cleaner; in addition, the boosting mechanism can compensate for the torque of the plunger, so that even if the performance of the motor component is not high, a higher output pressure and flow can be obtained, thereby effectively reducing the cost of the entire machine.

Brief Description of the Drawings

[0019] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0020] FIG1 is a schematic diagram of a handheld high-pressure cleaning machine of the present invention;

[0021] FIG2 is a schematic structural diagram of a driving module and a pump unit in a handheld high-pressure cleaning machine from a first angle;

[0022] FIG3 is a schematic structural diagram of a driving module and a pump unit in a handheld high-pressure cleaning machine from a second angle;

[0023] FIG4 is a schematic structural diagram of the driving module and the pump unit in the handheld high-pressure cleaning machine from a third angle;

[0024] FIG5 is a schematic structural diagram of the drive module and the pump unit of the handheld high-pressure cleaning machine from a fourth angle;

[0025] FIG6 is a schematic structural diagram of the drive module and the pump unit in the handheld high-pressure cleaning machine from a fifth angle;

[0026] FIG7 is a schematic diagram showing the connection between the insert and the housing in the drive module shown in FIG6 ;

[0027] FIG8 is a cross-sectional view of the drive module and the pump unit, when the boost mechanism is in the first stage;

[0028] FIG9 is a cross-sectional view of the drive module and the pump unit, when the boost mechanism is in the second stage;

[0029] FIG10 is a cross-sectional view of the drive module and the pump unit from another angle;

[0030] FIG11 is a schematic structural diagram of a motor assembly in a drive module;

[0031] FIG12 is a schematic structural diagram of the motor assembly from another angle;

[0032] FIG13 is a cross-sectional view of the motor assembly shown in FIG12;

[0033] FIG14 is a schematic structural diagram of a rotor assembly in a motor assembly;

[0034] FIG15 is a schematic structural diagram of the rotor assembly from another angle;

[0035] FIG16 is a cross-sectional view of the rotor assembly;

[0036] FIG17 is an enlarged view of circle B2 in FIG15 ;

[0037] Figure 18 is a schematic structural diagram of the end cover of the rotor assembly;

[0038] Figure 19 is a schematic structural diagram of the end cover from another angle;

[0039] FIG20 is a schematic diagram of the structure of the magnetic steel frame in the rotor assembly;

[0040] FIG21 is an enlarged view of the glue overflow port in the magnetic steel frame;

[0041] FIG22 is a schematic structural diagram of the stator core in the stator assembly;

[0042] FIG23 is a cross-sectional view of a stator tooth in a stator core;

[0043] FIG24 is an enlarged view of circle B3 in FIG23;

[0044] FIG25 is an enlarged view of circle B4 in FIG23;

[0045] FIG26 is an enlarged view of circle B1 in FIG9 ;

[0046] Figure 27 is a schematic structural diagram of the ring gear;

[0047] FIG28 is a schematic structural diagram of the ring gear from another angle;

[0048] FIG29 is a schematic structural diagram of an output member;

[0049] Figure 30 is a schematic structural diagram of the insert;

[0050] FIG31 is a schematic structural diagram of the insert from another angle;

[0051] FIG32 is a schematic structural diagram of the water inlet valve assembly, when the water inlet valve assembly is in the first state;

[0052] FIG33 is a schematic structural diagram of the water inlet valve assembly, when the water inlet valve assembly is in the second state;

[0053] FIG34 is a schematic structural diagram of the water inlet valve assembly, when the water inlet valve assembly is in the third state;

[0054] Figure 35 is a schematic structural diagram of the one-way valve assembly, when the valve core is in the first position;

[0055] FIG36 is a schematic structural diagram of the one-way valve assembly, when the valve core is in the second position;

[0056] FIG37 is an enlarged view of circle B5 in FIG35 ;

[0057] Figure 38 is a schematic structural diagram of the valve core;

[0058] FIG39 is a schematic structural diagram of the valve core from another angle;

[0059] FIG40 is a schematic structural diagram of the valve core from another angle;

[0060] Figure 41 is a schematic structural diagram of the bracket;

[0061] FIG42 is a schematic structural diagram of the bracket at another angle;

[0062] FIG43 is a schematic structural diagram of the bracket from another angle.

[0063] Meanings of the reference numerals in the figures: Handheld high-pressure cleaner 100 Battery pack 200 Motor assembly 1 Transmission assembly 2 Fan assembly 3 Pump unit 4 Housing 5 One-way valve assembly 6 Water inlet valve assembly 7 Booster mechanism 80 Water inlet end 10 Water outlet end 20 Water inlet channel 101 Water outlet channel 102 First sealing ring 103 Second sealing ring 104 Plunger 88 Motor shaft 11 Motor housing 12 Stator assembly 13 Rotor assembly 14 Motor teeth 15 First bearing 16 Second bearing 17 Stator core 131 Winding 132 Sleeve 1311 Stator teeth 1312 Core body 1313 Core shell 1314 First side 1315 Second side 1316 First arc-shaped portion with a curvature 1317 Second arc-shaped portion with a curvature 1318 First endpoint 13171 Second endpoint 13172 First length L1 Second length L2 End cover 141 End plate 1411 Cover plate 1412 Hole shaft 1413 Cooling hole 142 First section 1421 Second section 1422 Middle section 1423 Magnetic steel frame 143 Magnetic steel 144 Ring body 1431 End surface1432 Pillar 1433 Glue overflow port 1434 Chamfer 1435 Slot 1436 Air guide surface 1438 Heat dissipation space 145 First bearing chamber 121 Second bearing chamber 122 Circlip 18 Housing 21 Speed ​​reduction mechanism 22 Output member 23 Planetary gear 221 Ring gear 222 Pin 34 Fastener 223 Ring gear body 2221 Lip 2222 Clamping post 2223 First housing 211 Second housing 212 Connecting post 213 First axis A1 Second axis A2 Third axis A3 Middle portion 233 First portion 231 Second portion 232 Third bearing 224 Fourth bearing 225 First wall 2331 Second wall 2332 Through hole 2333 Notch 2334 Connecting hole 2335 Frame 234 Eccentric portion 235 Frame 2341 First protrusion 2342 Second protrusion 2343 Air hole 2344 Eccentric shaft 2351 Ring 2352 Slot 2353 Guide rod 881 Mounting groove 882 Fifth bearing 885 Pump body 41 Pressure chamber 42Insert 44, tensioning member 45, U-shaped body 451, mounting arm 452, positioning hole 453, fastening bolt 46, mounting seat 214, valve seat 71, cavity 72, first elastic member 73, valve ball 74, valve stem 75, support seat 76, water inlet side 781, water outlet side 782, water flow direction 783, direction 731, guide post 711, support 712, inner cavity 721, base 761, first protrusion 762, first sealing member 763, second sealing member 764, gasket 765, valve body 61, water inlet 62, water outlet 63, water flow channel 64, bracket 65, valve core 66, second elastic member 67, head 661, stem 662, spiral feature 663, third sealing ring 664, receiving cavity 665, guide head 6631, spiral portion 6632, proximal end 6633, distal end 6634, fourth axis A4 Contact surface 6611 First wall 6651 Second wall 6652 Third wall 6653 Buffer cavity 6654 Bracket body 651 Seat 652 Water channel 653Second protrusion 654 Support arm 655 Hole 6521 Support column 6522 Cavity 666 Base plate 441 Clamping arm 442 Step surface 443 Opening 444 Active cavity 215 Mounting opening 216 Stopper 217 Reinforcement rib 218 [Specific implementation method]

[0064] The present invention will be described in further detail below with reference to the accompanying drawings and implementation examples.

[0065] The terms used in this utility model are for the purpose of describing specific embodiments only and are not intended to limit the utility model. For example, the terms "upper," "lower," "front," "back," "left," "right," and the like, which indicate directions or positional relationships, are based solely on the directions or positional relationships shown in the accompanying drawings and are provided solely for the purpose of facilitating and simplifying the description of the utility model. They do not indicate or imply that the devices or components referred to must have a specific direction or be constructed or operated in a specific direction. Therefore, they should not be construed as limiting the utility model.

[0066] Please refer to Figures 1, 2 and 8. An embodiment of the present invention relates to a handheld high-pressure washer 100, which is suitable for pressurizing an external water flow and then spraying it outward to clean vehicles, courtyards, floors, etc.; the handheld high-pressure washer 100 includes a housing 5, a motor assembly 1 installed in the housing 5, a transmission assembly 2 connected to the motor assembly 1, a plunger 88 driven by the transmission assembly 2, a battery pack 200 for supplying energy to the motor assembly 1, and a pump unit 4 having a water inlet end 10 and a water outlet end 20. The water inlet end 10 and the water outlet end 20 are connected to each other, and the plunger 88 extends into the pump unit 4. The motor assembly 1 drives the plunger 88 to reciprocate in the pump unit 4 via the transmission assembly 2 to pressurize the external water flow entering from the water inlet end 10 and spray it outward from the water outlet end 20. Furthermore, the motor assembly 1, the transmission assembly 2 and the plunger 88 constitute a drive module of the handheld high-pressure cleaner 100, which is connected to the pump unit 4. After the external water source enters from the water inlet end 10, it is pressurized by the drive module and discharged from the water outlet end 20.

[0067] In this embodiment, the pump unit 4 is a single-cylinder pump driven by a plunger 88 , and the pump unit 4 is provided at one end of the plunger 88 .

[0068] Please refer to Figure 1, the above-mentioned housing 5 includes a main body portion that accommodates the motor assembly 1, the transmission assembly 2 and the pump unit 4, and a gripping portion extending from the end of the main body portion. The main body portion and the gripping portion are formed as a whole, and the battery pack 200 is detachably installed on the gripping portion.

[0069] Optionally, the nominal voltage of the above-mentioned battery pack 200 can be greater than or equal to 10V and less than or equal to 20V. For example, the nominal voltage of the battery pack 200 can be 12V, 18V, 20V, etc.; optionally, the nominal voltage of the battery pack 200 can be greater than or equal to 20V and less than or equal to 100V. For example, the nominal voltage of the battery pack 200 can be 24V, 40V, 56V, 80V, etc.

[0070] Optionally, the number of battery cells included in a battery cell group in the battery pack 200 may be greater than or equal to 3 and less than or equal to 5. For example, the number of battery cells included in a battery cell group may be 3, 4, or 5. Optionally, the number of battery cells included in a battery cell group in the battery pack 200 may be greater than or equal to 6 and less than or equal to 25. For example, the number of battery cells included in a battery cell group may be 6, 10, 14, 20, etc.

[0071] Please refer to Figures 11 to 13. The above-mentioned motor assembly 1 includes a motor housing 12, a stator assembly 13 installed on the motor housing 12, a motor shaft 11 movably connected to the motor housing 12, a rotor assembly 14 fixed to the motor shaft 11, motor teeth 15 installed on the motor shaft 11, a bearing assembly supporting the motor shaft 11 and a fan assembly 3 installed on the motor shaft 11. The motor assembly 1 is an outer rotor brushless motor. The rotor assembly 14 is sleeved on the outside of the stator assembly 13. The rotor assembly 14 and the motor teeth 15 are respectively installed at both ends of the motor shaft 11, and the fan assembly 3 is arranged adjacent to the rotor assembly 14. When the motor shaft 11 rotates, the rotor assembly 14 and the fan assembly 3 are driven to rotate simultaneously.

[0072] Furthermore, the airflow generated by the rotation of the fan assembly 3 flows through the rotor assembly 14 and the stator assembly 13 to cool the rotor assembly 14 and the stator assembly 13. Furthermore, the rotor assembly 14 includes an end cover 141 connected to the motor shaft 11 and a cooling hole 142 extending through the end cover 141. The cooling hole 142 is provided between the stator assembly 13 and the fan assembly 3, so that the airflow generated by the rotation of the fan assembly 3 flows through the interior of the rotor assembly 14 and effectively cools the area where the stator assembly 13 is located.

[0073] In this embodiment, the above-mentioned bearing assembly is located between the rotor assembly 14 and the motor teeth 15, and the bearing assembly includes a first bearing 16 close to the rotor assembly 14 and a second bearing 17 close to the motor teeth 15. Correspondingly, the motor housing 12 includes a first bearing chamber 121 for installing the first bearing 16 and a second bearing chamber 122 for installing the second bearing 17, and the first bearing chamber 121 and the second bearing chamber 122 are integrally formed on the motor housing 12.

[0074] As shown in FIG13 , the bearing assembly and motor shaft 11 are loosely fitted, while the rotor assembly 14, motor teeth 15, and motor shaft 11 are tightly fitted. The motor assembly 1 includes a circlip 18 disposed between the bearing assembly and motor teeth 15 to fill the gap between the bearing assembly and motor teeth 15. By sleeved around the outer side of the motor shaft 11, the circlip 18 is utilized to compensate for tolerances during assembly of the motor assembly 1 and prevent axial movement of the motor shaft 11. Furthermore, the circlip 18 has a certain degree of elasticity, which makes it less likely to damage the bearing assembly during press-fitting.

[0075] Furthermore, the rotor assembly 14 abuts against the inner ring of the first bearing 16 , the motor teeth 15 abut against the circlip 18 , and the circlip 18 abuts against the inner ring of the second bearing 17 .

[0076] Alternatively, the circlip 18 may also be disposed between the bearing assembly and the rotor assembly 14 , and the circlip 18 fills the gap between the bearing assembly and the rotor assembly 14 .

[0077] Please refer to Figures 14 to 16. The above-mentioned rotor assembly 14 includes an end cover 141 fixed to the motor shaft 11, a cooling hole 142 penetrating the end cover 141, and a magnetic frame 143 arranged on the inner side of the end cover 141. The rotor assembly 14 includes an end cover 141 fixed to the motor shaft 11, a magnetic frame 143 arranged on the inner side of the end cover 141, and a magnet 144 installed on the magnetic frame 143. The magnetic frame 143 is located between the end cover 141 and the stator assembly 13. The magnet 144 is fixed to the magnetic frame 143 by glue, and the magnetic frame 143 and the magnet 144 are abutted against the inner wall of the end cover 141.

[0078] Please refer to Figures 18 and 19, the above-mentioned end cover 141 includes an end plate 1411, a cover plate 1412 protruding from the peripheral side of the end plate 1411, and a hole shaft 1413 connected to the end plate 1411. The hole shaft 1413 is arranged in the middle of the end plate 1411, the motor shaft 11 is passed through the hole shaft 1413, and the end cover 141 is fixed to the motor shaft 11 via the hole shaft 1413.

[0079] In this embodiment, the cooling holes 142 are opened in the end plate 1411 , and the cooling holes 142 are distributed around the circumference of the hole axis 1413 .

[0080] As shown in FIG. 20 , the magnetic frame 143 comprises an annular body 1431, a plurality of struts 1433 extending outward from an end surface 1432 of the annular body 1431, and an air guide surface 1438 disposed inside the annular body 1431. The struts 1433 are spaced apart, with slots 1436 formed between adjacent struts 1433. The magnets 144 are positioned within the slots 1436, extending beyond the ends of the struts 1433. The air guide surface 1438 is configured to direct the airflow generated by the rotation of the fan assembly 3 toward the stator assembly 13 via the air guide surface 1438. By providing the air guide surface 1438 inside the annular body 1431 of the magnetic frame 143, cooling airflow is directed toward the stator assembly 13 via the air guide surface 1438, thereby cooling the stator assembly 13 and significantly improving the heat dissipation efficiency of the motor assembly 1.

[0081] In this embodiment, the air guiding surface 1438 is an arcuate surface extending from the support 1433 toward the cooling hole 142 , and the air guiding surface 1438 at least partially extends between the cooling hole 142 and the stator assembly 13 .

[0082] Furthermore, the motor assembly 1 has a second axis A2. In the direction of the second axis A2, the end plate 1411 and the stator assembly 13 are spaced apart to form a heat dissipation space 145. The heat dissipation space 145 allows cooling air to flow to enhance the heat dissipation effect of the motor assembly 1.

[0083] Furthermore, the heat dissipation space 145 extends through the stator assembly 13 .

[0084] Please refer to Figure 19, the above-mentioned cooling hole 142 includes a first section 1421 and a second section 1422 extending along the outer periphery of the hole axis 1413 and spaced apart from each other, and a middle section 1423 connected between the first section 1421 and the second section 1422. The first section 1421, the second section 1422 and the middle section 1423 are arranged together to form the cooling hole 142.

[0085] In this embodiment, there are multiple cooling holes 142, spaced apart around the hole axis 1413. Furthermore, the cooling holes 142 and the projections of the stator assembly 13 on the end plate 1411 at least partially overlap, allowing cooling airflow to flow through the stator assembly 13 and improving heat dissipation. Furthermore, the cooling holes 142 and the projections of the stator assembly 13 on the end plate 1411 overlap by at least 60%, further improving overall heat dissipation.

[0086] In this embodiment, the first section 1421 is disposed adjacent to the hole axis 1413 so that the cooling hole 142 covers the stator assembly 13 as much as possible to improve the heat dissipation effect.

[0087] Referring to Figures 20 and 21 , the magnetic frame 143 further includes a glue overflow port 1434 recessed inwardly from the end surface 1432 of the annular body 1431. The glue overflow port 1434 is located at the end of the magnetic steel 144 and is an arc-shaped recessed portion for receiving glue. During the installation of the magnetic steel 144 to the magnetic frame 143, the glue overflow port 1434 can store excess glue, ensuring the consistency of the installation and fit of the magnetic steel 144, and making the height and magnetic field distribution of the magnetic steel 144 more uniform. Furthermore, after curing, the stored glue is evenly distributed around the end cap 141 and the magnetic frame 143. The cured glue can also act as a buffer and vibration absorber during the operation of the motor assembly 1, thereby extending the service life of the motor assembly 1.

[0088] In this embodiment, the glue overflow port 1434 is provided at the connection position between the pillar 1433 and the end surface 1432 , that is, the glue overflow port 1434 is provided at the corner of the slot 1436 . Furthermore, the glue overflow port 1434 is connected to the slot 1436 .

[0089] As shown in FIG. 17 , the end of the support 1433 is provided with a chamfer 1435 so that a gap is left between the end cover 141 , the magnetic frame 143 and the magnetic steel 144 .

[0090] 13 , 22 and 23 , the stator assembly 13 includes a stator core 131 and a winding 132 wound around the stator core 131 . The stator core 131 includes a sleeve 1311 connected to the motor housing 12 and stator teeth 1312 protruding radially outward from the outer periphery of the sleeve 1311 . The winding 132 is wound around the stator teeth 1312 .

[0091] In this embodiment, the stator teeth 1312 include an iron core body 1313 and an iron core shell 1314 covering the iron core body 1313. The iron core shell 1314 has a pair of mutually parallel first sides 1315, a pair of mutually parallel second sides 1316, and curved portions 1317 and 1318 connecting the first and second sides 1315 and 1316. The windings 132 are abutted against the curved portions 1317 and 1318. The curved portions effectively reduce stress concentration at the corners of the stator teeth 1312, which can cause wire damage. They also provide a closer fit between the windings 132 and the stator teeth 1312, improving height consistency. Furthermore, the curved portions reduce the overall height and space of the wound windings 132, saving the length of the enameled wire used in the windings 132 and reducing the manufacturing cost of the motor assembly 1.

[0092] Please refer to Figures 24 and 25, the above-mentioned curvature arc portions 1317 and 1318 include a first curvature arc portion 1317 and a second curvature arc portion 1318 respectively arranged on both sides of the first edge 1315, and the first edge 1315, the second edge 1316, the first curvature arc portion 1317 and the second curvature arc portion 1318 are all arranged on the outer periphery of the core shell 1314.

[0093] Furthermore, there are two first curved portions 1317 and two second curved portions 1318 , and the first curved portions 1317 and the second curved portions 1318 are distributed at four corners of the core shell 1314 .

[0094] Furthermore, two identical arc-shaped portions of curvature are provided at both ends of the second side 1316 , that is, two first arc-shaped portions of curvature 1317 are provided at both ends of the upper second side 1316 , and two second arc-shaped portions of curvature 1318 are provided at both ends of the lower second side 1316 .

[0095] Furthermore, the first curvature arc portion 1317 and the second curvature arc portion 1318 are both elliptical in shape.

[0096] As shown in FIG. 24 , the first curved portion 1317 has a first endpoint 13171, a second endpoint 13172, and a center C1. A first length L1 is defined between center C1 and first endpoint 13171, and a second length L2 is defined between center C1 and second endpoint 13172. First length L1 is different from second length L2. Correspondingly, second curved portion 1318 has two endpoints 13181 and 13182, and a center C2. A length L3 is defined between center C2 and endpoint 13181, and a length L4 is defined between center C2 and endpoint 13182. Length L3 is also different from length L4.

[0097] Furthermore, the second length L2 is also different from the length L4, that is, the shapes of the first curved portion 1317 and the second curved portion 1318 are different.

[0098] In this embodiment, the airflow generated by the rotation of the fan assembly 3 passes through the cooling holes 142 and cools the winding 132 .

[0099] Please refer to Figures 2, 8 and 13. The above-mentioned transmission assembly 2 includes a housing 21, a reduction mechanism 22 connected to the motor assembly 1 and an output member 23 connected to the reduction mechanism 22. The motor shaft 11 of the motor assembly 1 extends into the housing 21, and the motor teeth 15 on the motor shaft 11 engage with the reduction mechanism 22. The output member 23 is connected to the plunger 88 and drives the plunger 88 to reciprocate. Furthermore, the plunger 88 is at least partially located in the housing 21 and extends into the pump unit 4 to pressurize the water in the pump unit 4.

[0100] As shown in FIG. 9 , the housing 21 and the motor housing 12 are integrally formed, and the motor housing 12 extends between the stator assembly 13 and the motor shaft 11 .

[0101] In this embodiment, the reduction mechanism 22 includes planetary gears 221 meshed with the motor teeth 15 of the motor assembly 1 , a ring gear 222 meshed with the planetary gears 221 , and bearings supporting the output member 23 . The output member 23 is connected to the planetary gears 221 via a pin 34 .

[0102] Please refer to FIG. 10 , a fastener 223 is passed through the housing 21 and the gear ring 222 to lock the housing 21 and the gear ring 222 .

[0103] Please refer to Figures 27 and 28, the above-mentioned ring gear 222 includes a ring gear body 2221 engaged with the planetary gear 221, a lip 2222 axially protruding from the end face of the ring gear body 2221, and a clamping column 2223 radially protruding from the outer periphery of the ring gear body 2221, the lip 2222 abuts and fits tightly against the inner side of the box shell 21, and the fastener 223 is penetrated through the box shell 21 and the clamping column 2223 to fix the box shell 21 and the ring gear 222.

[0104] Furthermore, the housing 21 includes a first housing 211 and a second housing 212, which are separated. The ring gear 222 is clamped between the first housing 211 and the second housing 212. Fasteners 223 are provided through the second housing 212, the ring gear 222, and the first housing 211 to lock the housing 21 and the ring gear 222. By exposing the ring gear 222 at least partially to the outside of the housing 21, the heat generated during the meshing operation of the planetary gears 221 and the ring gear 222 can be effectively dissipated outward through the ring gear 222, thereby improving the heat dissipation efficiency of the transmission assembly 2.

[0105] In this embodiment, there are two lips 2222, which respectively abut against the inner walls of the first and second housings 211, 212. The housing 21 also includes a connecting post 213 protruding from its outer periphery. Fasteners 223 are disposed through the connecting post 213 and the engaging post 2223 to secure the housing 21 and the ring gear 222 together. Furthermore, the output member 23 is an eccentric member. The force of the motor assembly 1 is transmitted to the output member 23 via the reduction mechanism 22. The output member 23 then drives the plunger 88 to reciprocate. The plunger 88 has a first axis A1 that is perpendicular to the second axis A2. During the high-speed reciprocating motion of the plunger 88, the ring gear 222 will be subjected to a large load and impact, and the ring gear 222 will be clamped between the first box shell 211 and the second box shell 212, and the two lips 2222 respectively abut against the inner walls of the first box shell 211 and the second box shell 212, and the surface of the clamping column 2223 and the surface of the connecting column 213 are tightly attached together, and then the second box shell 212, the ring gear 222 and the first box shell 211 are locked by a fastener 223, so that the ring gear 222 is effectively fixed and not easy to loosen.

[0106] As shown in Figure 26, the output member 23 comprises a central portion 233 that houses the planetary gears 221, a first portion 231 and a second portion 232 connected to either side of the central portion 233, and a pin 34 that secures the planetary gears 221 to the central portion 233. The bearings comprise a third bearing 224 supporting the first portion 231 and a fourth bearing 225 supporting the second portion 232. The pin 34 is located between the third and fourth bearings 224, 225. The central portion 233 comprises a first wall 2331 connected to the first portion 231, a second wall 2332 connected to the second portion 232, a through-hole 2333 extending through the second wall 2332, a notch 2334 recessed from the first wall 331, and a connecting hole 2335 connected to the notch 2334. One end of the pin 34 passes through the through-hole 2333 and abuts the inner race of the fourth bearing 225. The other end of the pin 34 extends into the notch 2334. By limiting one end of the pin 34 by the inner ring of the bearing 225 and the other end by the notch 2334 of the middle part 233, the entire pin 34 can be positioned without providing an additional stop washer. The structure is ingenious and effectively prevents the pin 34 from axial movement. In addition, during the movement of the planetary gear 221, the pin 34, the output member 23 and the bearing 225 are driven to move at the same time, resulting in low friction loss and high transmission efficiency.

[0107] In this embodiment, the inner diameter of the notch 2334 is the same as the inner diameter of the through hole 2333 , and the diameter of the connecting hole 2335 is smaller than the diameters of the notch 2334 and the pin 34 .

[0108] In this embodiment, the third bearing 224 is mounted on the first housing 211 , and the fourth bearing 225 is mounted on the second housing 212 .

[0109] In this embodiment, there are a plurality of planetary teeth 221 located between the first wall 2331 and the second wall 2332 , and there are a plurality of pins 34 respectively passing through corresponding planetary teeth 221 .

[0110] Please refer to Figure 29. The above-mentioned output member 23 is a split component, and includes a frame 234 connected to the reduction mechanism 22 and an eccentric portion 235 connected to the plunger 88. The eccentric portion 235 is fixed to the frame 234, and the frame 234 and the eccentric portion 235 are split structures, and the two are made of different materials.

[0111] Specifically, the eccentric portion 235 needs to withstand greater forces than the frame 234, and the rigidity requirement of the eccentric portion 235 is higher than that of the frame 234. Therefore, the material of the eccentric portion 235 must be superior to that of the frame 234. Correspondingly, the manufacturing cost of the eccentric portion 235 is also higher than that of the frame 234. Thus, while meeting transmission requirements, the eccentric portion 235 can be manufactured from a superior and more expensive material, while the frame 234 can be manufactured from a less superior and less expensive material, thereby reducing the manufacturing cost of the entire output member 23.

[0112] Referring to FIG. 10 , the third bearing 224 is supported by the frame 234 , and the fourth bearing 225 is supported by the eccentric portion 235 .

[0113] Please refer to Figure 29, the above-mentioned frame 234 includes a frame 2341 for accommodating the planetary gear 221, a first protrusion 2342 protruding from one end surface of the frame 2341 toward the motor assembly 1, and a second protrusion 2343 protruding from the other end surface of the frame 2341 toward the eccentric portion 235, and the eccentric portion 235 includes an eccentric shaft 2351 connected to the plunger 88 and a ring portion 2352 fixed to the eccentric shaft 2351, and the second protrusion 2343 is fixed to the ring portion 2352.

[0114] Furthermore, the eccentric portion 235 further includes a slot 2353 that is recessed from the end surface of the ring portion 2352 , and the second protrusion 2343 is retained in the slot 2353 .

[0115] In this embodiment, the third bearing 224 supports the first protrusion 2342 , and the fourth bearing 225 supports the ring portion 2352 .

[0116] In this embodiment, the frame 2341 forms the middle portion 233 , the first protrusion 2342 forms the first portion 231 , and the second protrusion 2343 and the ring portion 2352 together form the second portion 232 .

[0117] 10 and 29 , the frame 234 further includes a vent hole 2344 extending through the second protrusion 2343. One side of the vent hole 2344 communicates with the interior of the slot 2353, and the other side communicates with the interior of the frame 2341. Because the eccentric portion 235 and the frame 234 are tightly fitted, gas within the slot 2353 can be discharged through the vent hole 2344 during the assembly of the second protrusion 2343 to the ring portion 2352. This makes assembly of the eccentric portion 235 and the frame 234 more convenient and effective.

[0118] In this embodiment, in the direction of the second axis A2, the above-mentioned second protrusion 2343, the fourth bearing 225 and the ring portion 2352 at least partially overlap; and, in the direction of the second axis A2, the extended length of the second protrusion 2343 is less than the extended length of the fourth bearing 225, and the extended length of the fourth bearing 225 is less than the extended length of the ring portion 2352, so that the assembly effect between the eccentric portion 235 and the frame 234 is better.

[0119] In this embodiment, the above-mentioned plunger 88 has an inwardly concave mounting groove 882 and a fifth bearing 885 arranged in the mounting groove 882. The eccentric shaft 2351 of the eccentric portion 235 protrudes into the mounting groove 882 and is installed on the fifth bearing 885 to drive the plunger 88 to move to perform water pumping operations.

[0120] Furthermore, the eccentric shaft 2351 of the eccentric portion 235 has a third axis A3, and the third axis A3 and the second axis A2 are not collinear.

[0121] Alternatively, the output member 23 may also be an integrated component.

[0122] Please refer to Figures 8 and 9 again. The above-mentioned transmission assembly 2 also includes a boosting mechanism 80 abutting against the plunger 88. The boosting mechanism 80 is located in the box shell 21. The pump unit 4 has a pressure chamber 42 for accommodating the plunger 88. The boosting mechanism 80 and the pressure chamber 42 are respectively located at both ends of the plunger 88. The boosting mechanism 80 has a first stage of storing energy and a second stage of releasing energy. In the first stage, the transmission assembly 2 drives the plunger 88 to store energy in the boosting mechanism 80; in the second stage, the transmission assembly 2 drives the plunger 88 to pressurize the water in the pressure chamber 42, and at the same time, the boosting mechanism 80 applies a force on the plunger 88 toward the pressure chamber 42. The pump unit 4 is a single-cylinder pump, and the characteristics of a single-cylinder pump determine that the plunger 88 is only working in half of the cycle (i.e., pressurizing the water in the pressure chamber 42), so the efficiency is low; this embodiment sets a boosting mechanism 80 at the end of the plunger 88 away from the pump unit 4, so that the plunger 88 stores energy in the boosting mechanism 80 in the half cycle when it is not working, and the stored energy is released to the plunger 88 in the half cycle when it is working, thereby greatly improving the working efficiency of the handheld high-pressure cleaner 100; in addition, the boosting mechanism 80 can compensate for the torque of the plunger 88, so that even if the performance of the motor assembly 1 is not high, a higher output pressure and flow can be obtained, effectively reducing the cost of the entire machine.

[0123] In this embodiment, the above-mentioned plunger 88 includes a guide rod 881 protruding from the end toward the boosting mechanism 80, the transmission assembly 2 includes an insert 44 installed on the box shell 21, and the boosting mechanism 80 is a spring. One end of the boosting mechanism 80 is sleeved on the guide rod 881, and the other end is pressed against the insert 44.

[0124] Please refer to Figures 30 and 31 again. The above-mentioned insert 44 includes a base plate 441, a clamping arm 442 connected to the base plate 441, a step surface 443 provided at the connection between the base plate 441 and the clamping arm 442, and an opening 444 passing through the base plate 441. The clamping arm 442 is arranged in a U shape, and the two arms of the clamping arm 442 abut against the boosting mechanism 80. The insert 44 is an integrated structure.

[0125] As shown in FIG. 6 , the opening 444 is at least partially exposed to the outside of the box shell 21 to facilitate installation and removal of the insert 44 .

[0126] 3 and 7 , the step surface 443 abuts against the box shell 21 , one end surface of the clamping arm 442 abuts against the pressurizing mechanism 80 , and the other end surface abuts against the inner wall of the box shell 21 .

[0127] Furthermore, the box shell 21 includes an active cavity 215 extending along the first axis A1, an installation opening 216 extending perpendicular to the first axis A1, and a stopper 217 disposed in the installation opening 216. The step surface 443 abuts against the stopper 217 to limit the installation of the insert 44.

[0128] In this embodiment, the box shell 21 includes reinforcing ribs 218 provided on the outer peripheral surface, and the mounting opening 216 is located at the end of the box shell 21. The reinforcing ribs 218 are wrapped around the outside of the mounting opening 216 to make the area where the insert 44 is located stronger and less prone to damage.

[0129] In this embodiment, the plunger 88 performs reciprocating linear motion along the first axis A1 , and the boosting mechanism 80 also extends along the first axis A1 and applies a force along the first axis A1 to the plunger 88 .

[0130] Please refer to Figures 8 and 9. The above-mentioned pump unit 4 includes a pump body 41, an inlet valve assembly 7 arranged at the water inlet end 10, a first one-way valve assembly located between the inlet valve assembly 7 and the pressure chamber 42, and a second one-way valve assembly located between the pressure chamber 42 and the water outlet end 20. The pressure chamber 42 is formed in the pump body 41. The first one-way valve assembly and the second one-way valve assembly are two identical one-way valve assemblies 6. An inlet channel 101 is formed between the water inlet end 10 and the first one-way valve assembly 6, and a water outlet channel 102 is formed between the second one-way valve assembly 6 and the water outlet end 20.

[0131] The working principle of the handheld high-pressure cleaner 100 in this embodiment is as follows: an external water source is connected to the water inlet end 10, the water flows into the pressure chamber 42 after passing through the water inlet channel 101, the plunger 88 extends into the pressure chamber 42, and under the action of the motor assembly 1 and the transmission assembly 2, the water in the pressure chamber 42 is pressurized, the pressurized water flows through the water outlet channel 102, and then is sprayed outward from the water outlet end 20.

[0132] Specifically, in the first stage, the plunger 88 moves away from the pressure chamber 42, the water inlet end 10 is opened, the water inlet valve assembly 7 and the first one-way valve assembly are opened, and the second one-way valve assembly is closed, and the water outlet end 20 is closed, and water flows from the water inlet channel 101 into the pressure chamber 42; in the second stage, the plunger 88 moves closer to the pressure chamber 42 and pressurizes the water in the pressure chamber 42. At this time, the first one-way valve assembly is closed and the second one-way valve assembly and the water outlet end 20 are opened, and water flows out from the pressure chamber 42 through the water outlet channel 102.

[0133] In this embodiment, the water inlet channel 101 extends along the second axis A2 , the water outlet channel 102 extends along the first axis A1 , and the pressure chamber 42 extends along the first axis A1 .

[0134] In this embodiment, the water outlet direction of the water outlet 20 is consistent with the extending direction of the first axis A1.

[0135] In this embodiment, the projections of the motor assembly 1 and the pump unit 4 in the direction of the first axis A1 do not overlap.

[0136] Please refer to Figure 8. A first sealing ring 103 is provided in the pump body 41, and a second sealing ring 104 is provided in the box shell 21. The first sealing ring 103 and the second sealing ring 104 are both sleeved on the outer periphery of the plunger 88 and fit tightly with the outer periphery of the plunger 88 to form an efficient sealing effect.

[0137] As shown in Figures 3 to 5 , the pump unit 4 also includes a tensioning member 45 that secures the pump body 41 to the housing 21. A plunger 88 is located within the housing 21 and extends into the pump body 41. The pump body 41 is made of plastic, while the tensioning member 45 is made of metal. The housing 21 can be made of either metal or plastic. By attaching the pump body 41 to the housing 21 via the tensioning member 45, the pump body 41 is effectively protected from damage even under high pressure and impact, while also meeting user demands for higher output pressures and flows.

[0138] In this embodiment, the above-mentioned tensioning member 45 includes a U-shaped main body 451 that is covered on the outside of the pump body 41, a pair of mounting arms 452 extending outward from the two ends of the U-shaped main body 451, and a positioning port 453 that passes through the bottom wall of the U-shaped main body 451. The tensioning member 45 is fixed to the box shell 21 via a pair of mounting arms 452.

[0139] Furthermore, the housing 21 includes a mounting seat 214 corresponding to the mounting arm 452 , and a fastening bolt 46 passes through the mounting arm 452 and the mounting seat 214 to fix the tensioning member 45 to the housing 21 .

[0140] In this embodiment, the water outlet 20 extends through the positioning opening 453 .

[0141] In this embodiment, the U-shaped body 451 is symmetrically arranged about the first axis A1 , and the first axis A1 extends through the positioning opening 453 .

[0142] Please refer to Figures 32 to 34, the above-mentioned water inlet valve assembly 7 includes a valve seat 71, a cavity 72 opened in the valve seat 71, a first elastic member 73 placed in the cavity 72, a valve ball 74 abutting against the first elastic member 73, a valve stem 75 abutting against the valve ball 74, and a support seat 76 supporting the valve stem 75. The water inlet channel 101 is penetrated by the valve seat 71, and the water inlet channel 101 includes a water inlet side 781 for water to flow in, a water outlet side 782 for water to flow out, and a water flow direction 783 from the water inlet side 781 toward the water outlet side 782, and the water flow direction 783 extends roughly along a direction parallel to the second axis A2.

[0143] In this embodiment, the above-mentioned cavity 72 is located between the water inlet side 781 and the water outlet side 782; the first elastic member 73 extends along a direction 731 perpendicular to the water flow direction 783, and the direction 731 extends roughly along a direction parallel to the first axis A1. The first elastic member 73 and the valve stem 75 are located on both sides of the valve ball 74, and the valve ball 74 moves in the cavity 72.

[0144] In this embodiment, the water inlet valve assembly 7 has a first state in which water is not flowing and the water inlet channel 101 is open, a second state in which water is flowing and the water inlet channel 101 is closed, and a third state in which water is flowing and the water inlet channel 101 is open. Specifically, the first state is when no external water source is connected or when an external water source without pressure is connected, in which case the valve ball 74 is not subjected to force and does not block the water inlet channel 101; the second state is when an external water source with pressure is connected, in which case the valve ball 74 moves under the action of the water pressure and blocks the water inlet channel 101; and the third state is when the valve ball 74 is subjected to force and moves, thereby opening the water inlet channel 101.

[0145] In this embodiment, the user presses the valve stem 75 to drive the valve ball 74 to move along the direction 731 perpendicular to the water flow direction 783, thereby switching the water inlet valve assembly 7 from the second state to the third state. In the third state, the valve stem 75 drives the valve ball 74 to compress the first elastic member 73 so that the valve ball 74 does not block the water inlet channel 101.

[0146] By designing a novel water inlet valve assembly 7, when a pressurized water source is connected, the water pressure pushes the valve ball 74 to automatically block the water inlet channel 101, making water inlet controllable with a simple and low-cost structure. When the handheld high-pressure cleaner 100 needs to be operated, the water inlet channel 101 can be opened by pressing the valve stem 75. The valve ball 74 has little effect on the flow of water, resulting in a small pressure drop and a large instantaneous flow rate, thereby effectively improving the performance of the entire machine. During the opening process, the user only needs to use a slightly greater force to move the valve ball 74 at the beginning. As the water inlet channel 101 is opened, the valve ball 74 is squeezed toward the first elastic member 73 under the action of the water pressure, making it very easy for the user to subsequently press the valve stem 75. At the same time, the valve stem 75 is subjected to less force and is less likely to break, thereby meeting the user's operating requirements for a larger water inlet volume. In addition, the valve ball 74 rolls under the action of the water flow, and the valve ball 74 wears more evenly during contact with the valve seat 71, thereby improving self-adaptability and fault tolerance, and improving the service life.

[0147] Please refer to Figure 32, the above-mentioned valve seat 71 includes a guide column 711 protruding from the inner wall and a support 712 adjacent to the water inlet side 781. The guide column 711 extends into the cavity 72, and one end of the first elastic member 73 is sleeved on the guide column 711, and the other end abuts against the valve ball 74.

[0148] 34 , the cavity 72 has an inner cavity 721 for accommodating the first elastic member 73 . The guide post 711 is located in the inner cavity 721 . In the third state, the valve ball 74 abuts against the guide post 711 .

[0149] In the first state, the valve ball 74 is supported on the support 712 . During the switching process from the first state to the second state, the valve ball 74 is separated from the support 712 under the action of water pressure and moves along the water flow direction 783 , thereby closing the water inlet channel 101 .

[0150] Please refer to Figure 33, the above-mentioned support seat 76 includes a base 761 installed on the valve seat 71, a first protrusion 762 protruding outward from the outer periphery of the base 761, a first sealing member 763 arranged between the outer periphery of the base 761 and the valve seat 71, a second sealing member 764 arranged between the inner periphery of the base 761 and the valve stem 75, and a gasket 765 arranged between the base 761 and the valve ball 74. The valve stem 75 passes through the base 761 along a direction 731 perpendicular to the water flow direction 783, the first protrusion 762 is clamped on the valve seat 71, and the first sealing member 763 and the second sealing member 764 are located between the gasket 765 and the first protrusion 762.

[0151] Please refer to Figures 35 and 36. The above-mentioned one-way valve assembly 6 includes a valve body 61 provided with a water inlet 62 and a water outlet 63, a water flow channel 64 connected between the water inlet 62 and the water outlet 63, a bracket 65 installed on the valve body 61, a valve core 66 provided in the valve body 61 and a second elastic member 67 for biasing the valve core 66. The valve core 66 has a first position for blocking the water flow channel 64 and a second position for not blocking the water flow channel 64. In the first position, the valve core 66 abuts against the valve body 61 for sealing.

[0152] In this embodiment, the valve core 66 includes a head portion 661 that abuts against the valve body 61, a rod portion 662 connected to the head portion 661, and a spiral feature 663 provided on the head portion 661. The spiral feature 663 is provided on the end surface of the head portion 661 near the water inlet 62, and the spiral feature 663 and the rod portion 662 are located on opposite sides of the head portion 661. By providing the spiral feature 663 on the head portion 661 of the valve core 66, water entering from the water inlet 62 flows through the spiral feature 663, which can drive the valve core 66 to rotate. When the valve core 66 is in contact with the valve body 61, the head portion 661 adaptively pivots. This results in a highly consistent surface of the entire head portion 661, more even wear, and a significantly improved service life. In addition, the spiral feature 663 is integrally formed on the head portion 661, resulting in a simple structure and low cost.

[0153] Please refer to Figures 38 to 40, the above-mentioned spiral feature 663 includes a guide head 6631 located in the center of the head 661 and a spiral portion 6632 spirally extending from the guide head 6631 toward the edge of the head 661. The guide head 6631 protrudes from the end face of the head 661 toward the water inlet 62, and the top of the guide head 6631 is round-headed; and there are multiple spiral portions 6632, and the multiple spiral portions 6632 are distributed at intervals around the guide head 6631.

[0154] In this embodiment, the spiral portion 6632 includes a proximal end 6633 close to the guide head 6631 and a distal end 6634 away from the guide head 6631 . The proximal end 6633 gradually narrows toward the distal end 6634 , and the ends of the distal end 6634 converge at one point.

[0155] Furthermore, the valve core 66 has a fourth axis A4, the fourth axis A4 extends through the guide head 6631, and the guide head 6631 is symmetrically distributed about the fourth axis A4.

[0156] Furthermore, in the direction of the fourth axis A4, the guide head 6631 is closer to the water inlet 62 than the spiral portion 6632, so that the water source entering from the water inlet 62 flows through the guide head 6631 and the spiral portion 6632 in sequence to drive the entire valve core 66 to rotate, so that the wear of the valve core 66 is more uniform.

[0157] In this embodiment, the head portion 661 includes a contact surface 6611 that abuts against the valve body 61 , and the spiral feature 663 is provided on the inner side of the contact surface 6611 . The projections of the spiral feature 663 and the contact surface 6611 in the direction of the fourth axis A4 do not overlap.

[0158] In this embodiment, the above-mentioned second elastic member 67 is a spring, one end of the second elastic member 67 abuts against the head 661, and the other end abuts against the bracket 65, and the rotation direction of the valve core 66 is the same as the rotation direction of the second elastic member 67, and both are left-handed. Therefore, during the rotation of the valve core 66, the surface contact wear between the end of the second elastic member 67 and the head 661 is smaller, which is beneficial to improving the service life of the valve core 66.

[0159] 35 to 37 , the valve core 66 further includes a third sealing ring 664 mounted on the head portion 661. In the first position, the third sealing ring 664 abuts against the surface of the valve body 61. By providing the third sealing ring 664 on the head portion 661 of the valve core 66, the third sealing ring 664 contacts the surface of the valve body 61 and forms a seal, further enhancing the sealing effect of the one-way valve assembly 6.

[0160] In this embodiment, the above-mentioned head 661 includes a receiving cavity 665 recessed from the contact surface 6611, and the third sealing ring 664 is placed in the receiving cavity 665. The receiving cavity 665 includes a first wall 6651 away from the contact surface 6611, a second wall 6652 adjacent to the contact surface 6611, and a third wall 6653 connected between the first wall 6651 and the second wall 6652. The first wall 6651, the second wall 6652 and the third wall 6653 together form the receiving cavity 665.

[0161] In this embodiment, the second wall surface 6652 is a curved surface, and the second wall surface 6652 is in contact with the outer circumference of the third sealing ring 664 .

[0162] In the second position, the third sealing ring 664 is spaced apart from the third wall surface 6653 to form a buffer cavity 6654 ; in the first position, the third sealing ring 664 squeezes the valve body 61 and deforms, and the third sealing ring 664 extends into the buffer cavity 6654 to enhance the sealing effect of the third sealing ring 664 .

[0163] Please refer to Figures 40 to 43. The above-mentioned valve core 66 is connected to the bracket 65. The bracket 65 includes a bracket body 651, a seat body 652 located on the inner side of the bracket body 651, a water channel 653 provided between the seat body 652 and the bracket body 651, a second protrusion 654 extending from the end face of the bracket body 651 toward the head 661, and a bracket arm 655 connecting the seat body 652 and the bracket body 651. The seat body 652 has a through hole 6521, and the rod 662 is supported in the hole 6521 and moves along the hole 6521.

[0164] Furthermore, the seat body 652 includes a support column 6522 extending from the end face toward the head 661, and the valve core 66 includes a cavity 666 concave from the end face of the head 661 close to the support 65, and one end of the second elastic member 67 is sleeved on the outer periphery of the support column 6522, and the other end is accommodated in the cavity 666.

[0165] Furthermore, the end of the hole portion 6521 and the end of the cavity portion 666 are respectively provided with chamfers 6523 and 6661.

[0166] As shown in FIG. 36 , the second protrusion 654 abuts against the valve body 61 . There are multiple support arms 655 and multiple second protrusions 654 . Positions of the multiple second protrusions 654 correspond to positions of the multiple support arms 655 .

[0167] The present invention provides a boosting mechanism at the end of the plunger away from the pump unit, so that the plunger stores energy in the boosting mechanism during the half-cycle when it is not working, and releases the stored energy to the plunger during the half-cycle when it is working, thereby greatly improving the working efficiency of the handheld high-pressure cleaner; in addition, the boosting mechanism can compensate for the torque of the plunger, so that even if the performance of the motor component is not high, a higher output pressure and flow can be obtained, effectively reducing the cost of the entire machine.

[0168] The present invention is not limited to the specific embodiments described above. Those skilled in the art will readily appreciate that numerous alternatives to the handheld high-pressure cleaner of the present invention exist without departing from the principles and scope of the present invention. The scope of protection of the present invention shall be determined by the claims.

Claims

1. A handheld high-pressure cleaning machine, comprising a pump unit having a water inlet and a water outlet, a motor assembly, a transmission assembly connected to the motor assembly, and a plunger driven by the transmission assembly, wherein the transmission assembly has a housing, the plunger is at least partially located in the housing and extends to the pump unit, and the motor assembly drives the transmission assembly to drive the plunger to reciprocate in the pump unit; characterized in that: The transmission assembly includes a boosting mechanism abutting against the plunger, the boosting mechanism is located in the housing, the pump unit has a pressure chamber for accommodating the plunger, the boosting mechanism and the pressure chamber are located at both ends of the plunger, the boosting mechanism has a first stage for storing energy and a second stage for releasing energy, in the first stage, the transmission assembly drives the plunger to store energy in the boosting mechanism; in the second stage, the transmission assembly drives the plunger to pressurize the pressure chamber, and the boosting mechanism applies a force on the plunger toward the pressure chamber.

2. The handheld high-pressure cleaning machine according to claim 1, characterized in that: The plunger includes a guide rod protruding from the end toward the booster mechanism, the transmission assembly includes an insert installed on the box shell, and the booster mechanism is a spring, one end of the spring is sleeved on the guide rod, and the other end presses against the insert.

3. The handheld high-pressure cleaning machine according to claim 2, characterized in that: The insert includes a base plate, a clamping arm connected to the base plate, and a step surface provided at the connection between the base plate and the clamping arm, the step surface abuts against the box shell, one end surface of the clamping arm abuts against the boosting mechanism, and the other end surface abuts against the inner wall surface of the box shell.

4. The handheld high-pressure cleaning machine according to claim 3, characterized in that: The inserting piece includes a slot penetrating through the base plate, and the slot is at least partially exposed to the outside of the box shell.

5. The handheld high-pressure cleaning machine according to claim 3, characterized in that: The clamping arm is arranged in a U shape and has two arms parallel to each other, and the boosting mechanism abuts against the two arms of the clamping arm.

6. The handheld high-pressure cleaning machine according to claim 3, characterized in that: The box shell includes an active cavity penetrating the box shell along a first axial direction, an installation opening penetrating along a direction perpendicular to the first axial direction, and a stop portion arranged in the installation opening; the boosting mechanism is accommodated in the active cavity, and the step surface passes through the installation opening and abuts against the stop portion.

7. The handheld high-pressure cleaning machine according to claim 6, characterized in that: The box shell includes reinforcing ribs arranged on the outer peripheral surface, the installation opening is located at the end of the box shell, and the reinforcing ribs are covered on the outer side of the installation opening.

8. The handheld high-pressure cleaning machine according to claim 1, characterized in that: The transmission assembly includes a reduction mechanism connected to the motor assembly and an output member connected to the reduction mechanism, and the output member drives the plunger to reciprocate; the reduction mechanism includes planetary gears connected to the motor assembly and a ring gear engaged with the planetary gears, and fasteners are passed through the housing and the ring gear to lock the housing and the ring gear.

9. The handheld high-pressure cleaning machine according to claim 8, characterized in that: The ring gear includes a ring gear body meshed with the planetary gear, a lip protruding axially from the end face of the ring gear body, and a clamping column protruding radially outward from the outer periphery of the ring gear body, the lip abuts against the inner side of the case shell, and fasteners are passed through the case shell and the clamping column to fix the case shell and the ring gear.

10. The handheld high pressure cleaning machine according to claim 1, characterized in that: The plunger has a first axis, and the motor assembly has a second axis, the first axis is perpendicular to the second axis, and in the first stage, the water inlet end is opened and the water outlet end is closed, and the plunger moves away from the pressure chamber; in the second stage, the water inlet end is closed and the water outlet end is opened, and the plunger moves closer to the pressure chamber.

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