Handheld high-pressure cleaner

Abstract

The present application relates to a kind of hand-held high-pressure cleaner, including pump unit, motor assembly, transmission assembly and plunger, transmission assembly has box shell, plunger is at least partially located in box shell and extends to pump unit, transmission assembly drives plunger to do reciprocating motion in pump unit, to carry out water pumping operation;Transmission assembly includes the pressure-increasing mechanism that abuts at plunger, pressure-increasing mechanism is located in box shell, pump unit has the pressure chamber that plunger is received, pressure-increasing mechanism and pressure chamber are located at both ends of plunger, pressure-increasing mechanism has the first stage of energy storage and the second stage of energy release, in the first stage, transmission assembly drives plunger to carry out energy storage to pressure-increasing mechanism;In the second stage, transmission assembly drives plunger to pressurize pressure chamber, and pressure-increasing mechanism exerts force to plunger towards the direction of pressure chamber direction.The present application can greatly improve the work efficiency of hand-held high-pressure cleaner.

Description

[Technical Field]

[0001] This invention relates to the field of power tools, and in particular to a handheld high-pressure washer for cleaning vehicles, yards, floors, etc. [Background Technology]

[0002] Cleaning machines are widely used for cleaning vehicles, yards, and floors. Their working principle is generally that the motor assembly drives the plunger to reciprocate, forming high-pressure water in the pump assembly and spraying it outward through the nozzle to achieve the purpose of rinsing items. The single-cylinder pump in the cleaning machine is favored by users because of its simple structure and low cost.

[0003] The working principle of a cleaning machine using a single-cylinder pump is as follows: Under the power supply of the power source, the motor assembly drives the plunger to reciprocate within the pressure chamber of the single-cylinder pump; 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, it does work in the pressure chamber for half of the cycle and does not do work for the other half of the cycle, which results in the low overall efficiency of the single-cylinder pump.

[0004] In addition, the output pressure and flow rate of the cleaning machine are directly affected by the motor assembly. If higher output pressure and flow rate are desired, the performance requirements of the motor assembly will be higher, which will undoubtedly increase the cost of the motor assembly and thus increase the overall cost of the machine.

[0005] Therefore, it is indeed necessary to provide an improved handheld high-pressure washer to overcome the shortcomings of the existing technology. [Summary of the Invention]

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a handheld high-pressure washer that is both efficient and low-cost.

[0007] The present invention solves the problems of the prior art by adopting the following technical solution: A handheld high-pressure washer includes 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. The transmission assembly has a housing, and the plunger is at least partially located in the housing and extends into the pump unit. The transmission assembly drives the plunger to reciprocate within the pump unit to perform pumping operations. The transmission assembly includes a pressurizing mechanism abutting against the plunger. The pressurizing mechanism is located within the housing. The pump unit has a pressure chamber that houses the plunger. The pressurizing mechanism and the pressure chamber are located at both ends of the plunger. The pressurizing mechanism has a first stage of storing energy and a second stage of releasing energy. In the first stage, the transmission assembly drives the plunger to store energy in the pressurizing mechanism. In the second stage, the transmission assembly drives the plunger to pressurize the pressure chamber, and the pressurizing mechanism applies a force to the plunger toward the pressure chamber.

[0008] A further improvement is as follows: the plunger includes a guide rod protruding from its end toward the pressurizing mechanism; the transmission assembly includes a insert mounted on the housing; the pressurizing mechanism is a spring; one end of the pressurizing mechanism is sleeved on the guide rod, and the other end abuts against the insert.

[0009] A further improvement is as follows: the insert includes a substrate, a clamping arm connected to the substrate, and a stepped surface provided at the connection between the substrate and the clamping arm. The stepped surface abuts against the housing, one end face of the clamping arm abuts against the pressurizing mechanism, and the other end face abuts against the inner wall of the housing.

[0010] A further improvement is that the insert includes a slot that penetrates the substrate, and the slot is at least partially exposed on the outside of the housing.

[0011] A further improvement is as follows: the clamping arm is U-shaped, and the two arms of the clamping arm abut against the pressurizing mechanism.

[0012] A further improvement is as follows: the housing includes a movable cavity extending along the first axis, a mounting opening extending perpendicular to the first axis, and a stop portion disposed within the mounting opening, wherein the stepped surface abuts against the stop portion.

[0013] A further improvement is as follows: the housing includes reinforcing ribs on its outer periphery, the mounting opening is located at the end of the housing, and the reinforcing ribs cover the outside of the mounting opening.

[0014] A further improvement is as follows: the transmission assembly includes a reduction mechanism connected to the motor assembly and an output component connected to the reduction mechanism, the output component driving the plunger to reciprocate; the reduction mechanism includes planetary gears connected to the motor shaft of the motor assembly and a gear ring meshing with the planetary gears, and fasteners passing through the housing and the gear ring to lock the housing and the gear ring.

[0015] A further improvement is as follows: the gear ring includes a gear ring body that meshes with the planetary gear, a lip that extends axially from the end face of the gear ring body, and a snap-fit ​​post that extends radially from the outer periphery of the gear ring body. The lip abuts against the inner side of the housing, and fasteners pass through the housing and the snap-fit ​​post to fix the housing and the gear ring.

[0016] A further improvement is as follows: 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 is open and the water outlet is closed, and the plunger moves away from the pressure chamber; in the second stage, the water inlet is closed and the water outlet is open, and the plunger moves closer to the pressure chamber.

[0017] Compared with the prior art, the present invention has the following beneficial effects: by setting a pressurizing mechanism at the end of the plunger away from the pump unit, the plunger stores energy in the pressurizing mechanism during the half-cycle when it does no work, and the stored energy is released to the plunger during the half-cycle when it does work, which greatly improves the working efficiency of the handheld high-pressure washer; in addition, the pressurizing mechanism can compensate for the torque of the plunger, so that even when the performance of the motor assembly is not high, a higher output pressure and flow rate can be obtained, effectively reducing the overall cost of the machine. [Attached Image Description]

[0018] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the handheld high-pressure washer of the present invention;

[0020] Figure 2 This is a structural schematic diagram of the drive module and pump unit in a handheld high-pressure washer from the first angle.

[0021] Figure 3 This is a structural schematic diagram of the drive module and pump unit in a handheld high-pressure washer from a second angle.

[0022] Figure 4 This is a structural diagram of the drive module and pump unit in a handheld high-pressure washer from the third angle.

[0023] Figure 5This is a structural diagram of the drive module and pump unit in a handheld high-pressure washer from the fourth angle.

[0024] Figure 6 This is a structural diagram of the drive module and pump unit in a handheld high-pressure washer from the fifth angle.

[0025] Figure 7 yes Figure 6 The diagram shows the connection between the insert and the housing in the drive module.

[0026] Figure 8 This is a cross-sectional view of the drive module and pump unit, with the booster mechanism in its first stage.

[0027] Figure 9 This is a cross-sectional view of the drive module and pump unit, with the booster mechanism in its second stage.

[0028] Figure 10 This is a cross-sectional view of the drive module and pump unit from another angle;

[0029] Figure 11 This is a structural diagram of the motor assembly in the drive module;

[0030] Figure 12 This is a structural schematic diagram of the motor assembly from another angle;

[0031] Figure 13 yes Figure 12 A cross-sectional view of the motor assembly shown;

[0032] Figure 14 This is a schematic diagram of the rotor assembly in the motor assembly;

[0033] Figure 15 This is a schematic diagram of the rotor assembly from another angle;

[0034] Figure 16 This is a cross-sectional view of the rotor assembly;

[0035] Figure 17 yes Figure 15 Enlarged view of center circle B2;

[0036] Figure 18 This is a schematic diagram of the end cover structure in the rotor assembly;

[0037] Figure 19 This is a structural diagram of the end cap from another angle;

[0038] Figure 20 This is a schematic diagram of the magnet frame in the rotor assembly;

[0039] Figure 21 This is an enlarged view of the glue overflow port in the magnetic steel frame;

[0040] Figure 22 This is a schematic diagram of the stator core in the stator assembly;

[0041] Figure 23 It is a cross-sectional view of the stator teeth in the stator core;

[0042] Figure 24 yes Figure 23 Enlarged view of center circle B3;

[0043] Figure 25 yes Figure 23 Enlarged view of center circle B4;

[0044] Figure 26 yes Figure 9 Enlarged view of center circle B1;

[0045] Figure 27 This is a schematic diagram of the gear ring structure;

[0046] Figure 28 This is a structural diagram of the gear ring from another angle;

[0047] Figure 29 This is a structural diagram of the output component;

[0048] Figure 30 This is a schematic diagram of the insert structure;

[0049] Figure 31 This is a structural diagram of the insert from another angle;

[0050] Figure 32 This is a structural diagram of the inlet valve assembly, which is currently in its first state.

[0051] Figure 33 This is a structural diagram of the inlet valve assembly, which is currently in the second state.

[0052] Figure 34 This is a structural diagram of the inlet valve assembly, which is currently in the third state.

[0053] Figure 35 This is a structural diagram of a one-way valve assembly, with the valve core in the first position at this time.

[0054] Figure 36 This is a structural diagram of a one-way valve assembly, with the valve core in the second position at this time.

[0055] Figure 37 yes Figure 35 Enlarged view of center circle B5;

[0056] Figure 38 This is a schematic diagram of the valve core structure;

[0057] Figure 39This is a structural diagram of the valve core from another angle;

[0058] Figure 40 This is a structural diagram of the valve core from another angle;

[0059] Figure 41 This is a schematic diagram of the support structure;

[0060] Figure 42 This is a structural diagram of the support structure from another angle;

[0061] Figure 43 This is a structural diagram of the support frame from another angle.

[0062] Meaning of the reference numerals in the diagram:

[0063] Handheld high-pressure washer 100, battery pack 200

[0064] Motor assembly 1, Transmission assembly 2

[0065] Fan assembly 3 Pump unit 4

[0066] 5. Housing; 6. One-way valve assembly; 7. Inlet valve assembly; 80. Pressurization mechanism; 10. Inlet end; 20. Outlet end; 101. Inlet channel; 102. Outlet channel; 103. First sealing ring; 104. Second sealing ring; 88. Plunger; 11. Motor shaft; 12. Motor housing; 13. Stator assembly; 14. Rotor assembly; 15. Motor gear; 16. First bearing; 17. Second bearing; 18. Stator core; 131. Winding; 132. Sleeve; 1311. Stator gear; 1312. Core body; 1313. Core shell; 1314. First side; 1315. Second side; 1316. First curvature arc portion; 1317. Second curvature arc portion; 1318. First end point; 13171. Second end point; 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. Magnet frame; 143. 144 Magnet, 1431 Ring-shaped body, 1432 End face, 1432 Support column, 1433 Glue overflow port, 1434 Chamfer, 1435 Groove, 1436 Air guide surface, 1438 Heat dissipation space, 145 First bearing chamber, 121 Second bearing chamber, 122 Elastic retaining ring, 18 Housing, 21 Reduction mechanism, 22 Output component, 23 Planetary gear, 221 Gear ring, 222 Pin, 34 Fastener, 223 Gear ring body, 2221 Lip, 2222 Snap-fit ​​post, 2223 First housing, 211 Second housing, 212 Connecting post, 213 First axis A1, Second axis A2, Third axis A3, Middle part, 233 First part, 231 Second part, 232

[0067] Third bearing 224 Fourth bearing 225 First wall 2331 Second wall 2332 Through hole 2333 Groove 2334 Connecting hole 2335 Frame 234 Eccentric part 235 Frame 2341 First protrusion 2342 Second protrusion 2343 Vent hole 2344 Eccentric shaft 2351 Ring part 2352 Slot 2353 Guide rod 881 Mounting slot 882 Fifth bearing 885 Pump body 41 Pressure chamber 42 Insert 44 Tensioner 45 U-shaped body 451 Mounting arm 452 Positioning port 453 Fastening bolt 46 Mounting seat 214 Valve seat 71 Cavity 72 First elastic element 73 Valve ball 74 Valve stem 75 Support seat 76 Inlet side 781 Outlet side 782 Water flow direction 783 Direction 731 Guide post 711 Support 712 Inner cavity 721 Base 761 First protrusion 762 First seal 763, Second seal 764, Gasket 765, Valve body 61, Inlet 62, Outlet 63, Water flow channel 64, Support 65, Valve core 66, Second elastic element 67, Head 661, Stem portion 662, Helical feature 663, Third sealing ring 664, Receiving cavity 665

[0068] Guide head 6631, spiral section 6632

[0069] Proximal 6633 Distal 6634

[0070] Fourth axis A4 contact surface 6611

[0071] First wall 6651 Second wall 6652

[0072] Third wall surface 6653 Buffer cavity 6654

[0073] Support body 651, base 652

[0074] Waterway 653 Second protrusion 654

[0075] Support arm 655, hole 6521

[0076] 6522 support column, 666 cavity

[0077] Base plate 441 Clamp arm 442

[0078] Step surface 443 Opening 444

[0079] Movable cavity 215 Mounting port 216

[0080] Stop 217 Reinforcing rib 218

Detailed Implementation Methods

[0081] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0082] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," "left," and "right" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0083] Please see Figure 1 , Figure 2 and Figure 8 As shown, the embodiments of the present invention relate to a handheld high-pressure washer 100, which is suitable for pressurizing external water flow and spraying it outward to clean vehicles, yards, ground, 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 that supplies power to the motor assembly 1, and a pump unit 4 having a water inlet 10 and a water outlet 20. The water inlet 10 and the water outlet 20 are interconnected. The plunger 88 extends into the pump unit 4. The motor assembly 1 drives the plunger 88 to reciprocate within the pump unit 4 via the transmission assembly 2, so as to pressurize the external water flow entering from the water inlet 10 and spray it outward from the water outlet 20. Furthermore, the motor assembly 1, the transmission assembly 2, and the plunger 88 constitute the drive module of the handheld high-pressure washer 100. This drive module is connected to the pump unit 4. After the external water source enters from the water inlet 10, it is pressurized by the drive module and discharged from the water outlet 20.

[0084] In this embodiment, the pump unit 4 is a single-cylinder pump driven by a plunger 88, and the pump unit 4 is disposed at one end of the plunger 88.

[0085] Please see Figure 1 As shown, the housing 5 includes a main body portion that houses the motor assembly 1, the transmission assembly 2, and the pump unit 4, and a grip portion extending from the end of the main body portion. The main body portion and the grip portion are formed as a whole, and the battery pack 200 is detachably mounted on the grip portion.

[0086] Optionally, the nominal voltage of the 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.

[0087] Optionally, the number of battery cells in a single battery cell group in the battery pack 200 can be greater than or equal to 3 and less than or equal to 5. For example, the number of battery cells in a single battery cell group can be 3, 4, or 5. Optionally, the number of battery cells in a single battery cell group in the battery pack 200 can be greater than or equal to 6 and less than or equal to 25. For example, the number of battery cells in a single battery cell group can be 6, 10, 14, 20, etc.

[0088] Please see Figures 11 to 13 As shown, the motor assembly 1 includes a motor housing 12, a stator assembly 13 mounted 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 mounted on the motor shaft 11, a bearing assembly supporting the motor shaft 11, and a fan assembly 3 mounted on the motor shaft 11. The motor assembly 1 is an external 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 mounted on 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, it drives the rotor assembly 14 and the fan assembly 3 to rotate simultaneously.

[0089] 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 them. Even further, the rotor assembly 14 includes an end cover 141 connected to the motor shaft 11 and a cooling hole 142 penetrating the end cover 141. The cooling hole 142 is located between the stator assembly 13 and the fan assembly 3, allowing the airflow generated by the rotation of the fan assembly 3 to flow through the interior of the rotor assembly 14 and effectively cool the area where the stator assembly 13 is located.

[0090] In this embodiment, the bearing assembly is located between the rotor assembly 14 and the motor teeth 15, and the bearing assembly includes a first bearing 16 near the rotor assembly 14 and a second bearing 17 near the motor teeth 15. Correspondingly, the motor housing 12 includes a first bearing chamber 121 for mounting the first bearing 16 and a second bearing chamber 122 for mounting the second bearing 17, and the first bearing chamber 121 and the second bearing chamber 122 are integrally formed on the motor housing 12.

[0091] Please see Figure 13As shown, the bearing assembly and motor shaft 11 have a loose fit, while the rotor assembly 14, motor gear 15, and motor shaft 11 have a tight fit. The motor assembly 1 includes an elastic retaining ring 18 disposed between the bearing assembly and the motor gear 15, filling the gap between them. By fitting the elastic retaining ring 18 on the outside of the motor shaft 11, the elastic retaining ring 18 compensates for tolerances during the assembly process of the motor assembly 1, preventing axial movement of the motor shaft 11. Furthermore, the elastic retaining ring 18 has a certain degree of elasticity, making it less likely to damage the bearing assembly during press-fitting.

[0092] Furthermore, the rotor assembly 14 abuts against the inner ring of the first bearing 16, the motor teeth 15 abut against the elastic retaining ring 18, and the elastic retaining ring 18 abuts against the inner ring of the second bearing 17.

[0093] Alternatively, the aforementioned elastic retaining ring 18 may also be disposed between the bearing assembly and the rotor assembly 14, and the elastic retaining ring 18 fills the gap between the bearing assembly and the rotor assembly 14.

[0094] Please see Figures 14 to 16 As shown, the 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 magnet frame 143 disposed 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 magnet frame 143 disposed on the inner side of the end cover 141, and magnets 144 mounted on the magnet frame 143. The magnet frame 143 is located between the end cover 141 and the stator assembly 13. The magnets 144 are fixedly mounted on the magnet frame 143 with glue, and the magnet frame 143 and the magnets 144 are in contact with the inner wall of the end cover 141.

[0095] Please combine Figure 18 and Figure 19 As shown, the end cap 141 includes an end plate 1411, a cover plate 1412 protruding from the periphery of the end plate 1411, and a hole shaft 1413 connected to the end plate 1411. The hole shaft 1413 is located in the middle of the end plate 1411, the motor shaft 11 passes through the hole shaft 1413, and the end cap 141 is fixed to the motor shaft 11 via the hole shaft 1413.

[0096] In this embodiment, the cooling holes 142 are formed on the end plate 1411, and the cooling holes 142 are distributed around the shaft 1413.

[0097] Please combine Figure 20As shown, the aforementioned magnet frame 143 includes an annular body 1431, a plurality of support columns 1433 protruding outward from the end face 1432 of the annular body 1431, and an air guide surface 1438 disposed on the inner side of the annular body 1431. The plurality of support columns 1433 are spaced apart, and a slot 1436 is formed between adjacent support columns 1433. Magnets 144 are placed within the slots 1436, and the magnets 144 extend beyond the ends of the support columns 1433. The air guide surface 1438 is used to direct the airflow generated by the rotation of the fan assembly 3 towards the stator assembly 13. By providing the air guide surface 1438 on the inner side of the annular body 1431 of the magnet frame 143, cooling airflow is directed towards the stator assembly 13 via the air guide surface 1438, thereby cooling the stator assembly 13 and significantly improving the heat dissipation effect of the motor assembly 1.

[0098] In this embodiment, the air guide surface 1438 is an arc-shaped surface extending from the support column 1433 toward the cooling hole 142, and the air guide surface 1438 extends at least partially between the cooling hole 142 and the stator assembly 13.

[0099] 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, which provides cooling airflow to improve the heat dissipation effect of the motor assembly 1.

[0100] Furthermore, the aforementioned heat dissipation space 145 extends through the stator assembly 13.

[0101] Please see Figure 19 As shown, the cooling hole 142 includes a first segment 1421 and a second segment 1422 that extend along the outer periphery of the hole shaft 1413 and are spaced apart from each other, and an intermediate segment 1423 that connects the first segment 1421 and the second segment 1422. The first segment 1421, the second segment 1422 and the intermediate segment 1423 are arranged to surround each other to form the cooling hole 142.

[0102] In this embodiment, there are multiple cooling holes 142, which are spaced apart around the hole axis 1413. Furthermore, the projections of the cooling holes 142 and the stator assembly 13 onto the end plate 1411 at least partially overlap, allowing cooling airflow to pass through the stator assembly 13 to improve heat dissipation. Even further, the projections of the cooling holes 142 and the stator assembly 13 onto the end plate 1411 overlap by at least 60%, further enhancing the overall heat dissipation effect.

[0103] In this embodiment, the first segment 1421 is arranged adjacent to the shaft 1413 so that the cooling hole 142 covers the stator assembly 13 as much as possible to improve the heat dissipation effect.

[0104] Please see Figure 20and Figure 21 As shown, the aforementioned magnet frame 143 also includes an overflow port 1434 recessed inward from the end face 1432 of the annular body 1431. The overflow port 1434 is located at the end of the magnet 144 and is an arc-shaped recess. The overflow port 1434 is used to collect adhesive. During the installation of the magnet 144 onto the magnet frame 143, the overflow port 1434 can store excess adhesive, ensuring the consistency of the magnet 144's installation and adhesion, making the height and magnetic field distribution of the magnet 144 more uniform. In addition, after the stored adhesive cures, it will be evenly distributed around the end cap 141 and the magnet frame 143. The cured adhesive can also play a buffering and vibration-absorbing role during the operation of the motor assembly 1, extending the service life of the motor assembly 1.

[0105] In this embodiment, the overflow port 1434 is located at the connection between the support column 1433 and the end face 1432, that is, the overflow port 1434 is located at the corner of the groove 1436. Furthermore, the overflow port 1434 is connected to the groove 1436.

[0106] Please combine Figure 17 As shown, the end of the aforementioned support column 1433 is provided with a chamfer 1435 so that a gap is left between the end cap 141, the magnet frame 143 and the magnet 144.

[0107] Please see Figure 13 , Figure 22 and Figure 23 As shown, 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 that protrude radially outward from the outer periphery of the sleeve 1311. The winding 132 is wound around the stator teeth 1312.

[0108] In this embodiment, the stator tooth 1312 includes a core body 1313 and a core shell 1314 covering the core body 1313. The core shell 1314 has a pair of first sides 1315 arranged parallel to each other, a pair of second sides 1316 arranged parallel to each other, and curved portions 1317 and 1318 connecting the first sides 1315 and the second sides 1316. The winding 132 abuts against the curved portions 1317 and 1318. The curved portions can effectively reduce the problem of wire damage caused by stress concentration at the corners of the stator tooth 1312, and at the same time make the winding 132 and the stator tooth 1312 fit more closely to improve the consistency in height. In addition, the curved portions reduce the overall height and space of the wound winding 132 after winding, which helps to save the length of enameled wire used in the winding 132 and reduce the manufacturing cost of the motor assembly 1.

[0109] Please see Figure 24 and Figure 25 As shown, the above-mentioned curvature arc portions 1317 and 1318 include a first curvature arc portion 1317 and a second curvature arc portion 1318 respectively disposed on both sides of the first side 1315. The first side 1315, the second side 1316, the first curvature arc portion 1317 and the second curvature arc portion 1318 are all disposed on the outer periphery of the iron core shell 1314.

[0110] Furthermore, there are two of each of the above-mentioned first curvature arc portion 1317 and second curvature arc portion 1318, which are distributed at the four corners of the iron core shell 1314.

[0111] Furthermore, two identical curved portions are provided at both ends of the second side 1316, namely, two first curved portions 1317 are provided at both ends of the upper second side 1316, and two second curved portions 1318 are provided at both ends of the lower second side 1316.

[0112] Furthermore, both the first curvature arc portion 1317 and the second curvature arc portion 1318 are elliptical in shape.

[0113] Please see Figure 24 As shown, the first curvature arc portion 1317 has a first endpoint 13171, a second endpoint 13172, and a center C1. A first length L1 exists between the center C1 and the first endpoint 13171, and a second length L2 exists between the center C1 and the second endpoint 13172. The first length L1 is different from the second length L2. Correspondingly, the second curvature arc portion 1318 also has two endpoints 13181 and 13182 and a center C2. The length between the center C2 and the endpoint 13181 is L3, and the length between the center C2 and the endpoint 13182 is L4. The length L3 is also different from the length L4.

[0114] Furthermore, the second length L2 is also different from the length L4, that is, the first curvature arc portion 1317 and the second curvature arc portion 1318 have different shapes.

[0115] In this embodiment, the airflow generated by the rotation of the fan assembly 3 passes through the cooling hole 142 and cools the winding 132.

[0116] Please see Figure 2 , Figure 8 and Figure 13As shown, the transmission assembly 2 includes a housing 21, a reduction mechanism 22 connected to the motor assembly 1, and an output component 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 mesh with the reduction mechanism 22. The output component 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.

[0117] Please combine Figure 9 As shown, the housing 21 and the motor housing 12 are integrally constructed, and the motor housing 12 extends between the stator assembly 13 and the motor shaft 11.

[0118] In this embodiment, the aforementioned speed reduction mechanism 22 includes planetary gears 221 meshing with motor gears 15 of motor assembly 1, a gear ring 222 meshing with planetary gears 221, and a bearing supporting output member 23. Output member 23 is connected to planetary gears 221 via pin 34.

[0119] Please see Figure 10 As shown, a fastener 223 passes through the housing 21 and the toothed ring 222 to lock the housing 21 and the toothed ring 222.

[0120] Please combine Figure 27 and Figure 28 As shown, the aforementioned gear ring 222 includes a gear ring body 2221 that meshes with the planetary gear 221, a lip 2222 that protrudes axially from the end face of the gear ring body 2221, and a snap-fit ​​post 2223 that protrudes radially from the outer periphery of the gear ring body 2221. The lip 2222 abuts against and is tightly attached to the inner side of the housing 21. Fasteners 223 pass through the housing 21 and the snap-fit ​​post 2223 to fix the housing 21 and the gear ring 222.

[0121] Furthermore, the aforementioned housing 21 includes a separated first housing 211 and a second housing 212, with a gear ring 222 clamped between the first housing 211 and the second housing 212. Fasteners 223 pass through the second housing 212, the gear ring 222, and the first housing 211 to lock the housing 21 and the gear ring 222. By exposing at least part of the gear ring 222 outside the housing 21, the heat generated during the meshing operation of the planetary gears 221 and the gear ring 222 can be effectively dissipated outward through the gear ring 222, improving the heat dissipation efficiency of the transmission assembly 2.

[0122] In this embodiment, there are two lips 2222, which respectively abut against the inner walls of the first housing 211 and the second housing 212; the housing 21 also includes a connecting post 213 protruding from the outer periphery, and a fastener 223 passes through the connecting post 213 and the snap-fit ​​post 2223 to fix the housing 21 and the gear ring 222 together. Furthermore, the output member 23 is an eccentric member, and the force of the motor assembly 1 is transmitted to the output member 23 via the reduction mechanism 22, and the output member 23 then drives the plunger 88 to reciprocate; and the plunger 88 has a first axis A1, which is perpendicular to the second axis A2. During the high-speed reciprocating motion of the plunger 88, the gear ring 222 will be subjected to a large load and impact. The gear ring 222 is clamped between the first housing 211 and the second housing 212, and the two lips 2222 respectively abut against the inner walls of the first housing 211 and the second housing 212. The surface of the snap-fit ​​post 2223 and the surface of the connecting post 213 are tightly attached together. Then, the second housing 212, the gear ring 222 and the first housing 211 are locked by a fastener 223. The gear ring 222 is effectively fixed and is not easy to loosen.

[0123] Please see Figure 26 As shown, the output component 23 includes a middle portion 233 for receiving planetary gears 221, a first portion 231 and a second portion 232 respectively connected to the two sides of the middle portion 233, and a pin 34 for mounting the planetary gears 221 to the middle portion 233. The bearings include 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 bearing 224 and the fourth bearing 225. The middle portion 233 includes a first wall 2331 connected to the first portion 231, a second wall 2332 connected to the second portion 232, a through hole 2333 penetrating the second wall 2332, a groove 2334 recessed from the wall surface of the first wall 231, and a connecting hole 2335 communicating with the groove 2334. One end of the pin 34 passes through the through hole 2333 and abuts against the inner ring of the fourth bearing 225, and the other end of the pin 34 extends into the groove 2334. By limiting one end of the pin 34 with the inner ring of the bearing 225 and the other end with the slot 2334 of the middle part 233, the entire pin 34 can be positioned without the need for additional stop shims. The structure is ingenious and effectively prevents the pin 34 from moving axially. In addition, during the movement of the planetary gear 221, the pin 34, the output part 23 and the bearing 225 are driven to move simultaneously, resulting in low friction loss and high transmission efficiency.

[0124] In this embodiment, the inner diameter of the slot 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 diameter of the slot 2334 and the pin 34.

[0125] 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.

[0126] In this embodiment, the planetary teeth 221 are multiple and located between the first wall 2331 and the second wall 2332, and the pins 34 are also multiple and are respectively inserted into the corresponding planetary teeth 221.

[0127] Please see Figure 29 As shown, the output component 23 is a split component, including a frame 234 connected to the deceleration mechanism 22 and an eccentric part 235 connected to the plunger 88. The eccentric part 235 is fixed to the frame 234, and the frame 234 and the eccentric part 235 are split structures, and the two are made of different materials.

[0128] Specifically, the eccentric part 235 needs to withstand greater forces than the frame 234, and its rigidity requirement is higher. Therefore, the material of the eccentric part 235 must be superior to that of the frame 234, and correspondingly, its manufacturing cost is also higher. Thus, while meeting transmission requirements, the eccentric part 235 is made of a better and more expensive material, while the frame 234 can be made of a slightly inferior and less expensive material, thereby reducing the overall manufacturing cost of the output component 23.

[0129] Please see Figure 10 As shown, the third bearing 224 is supported on the frame 234, and the fourth bearing 225 is supported on the eccentric part 235.

[0130] Please combine Figure 29 As shown, the frame 234 includes a frame 2341 for housing the planetary gear 221, a first protrusion 2342 protruding from one end face of the frame 2341 toward the motor assembly 1, and a second protrusion 2343 protruding from the other end face of the frame 2341 toward the eccentric portion 235. 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. The second protrusion 2343 is fixed to the ring portion 2352.

[0131] Furthermore, the aforementioned eccentric portion 235 also includes a slot 2353 recessed from the end face of the ring portion 2352, and the second protrusion 2343 is fixed within the slot 2353.

[0132] In this embodiment, the third bearing 224 supports the first protrusion 2342, and the fourth bearing 225 supports the ring portion 2352.

[0133] 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.

[0134] Please see Figure 10 and Figure 29 As shown, the frame 234 also has a vent 2344 penetrating the second protrusion 2343. One side of the vent 2344 is connected to the interior of the slot 2353, and the other side is connected to the interior of the frame 2341. Since the eccentric portion 235 and the frame 234 are tightly fitted, during the process of installing the second protrusion 2343 to the ring portion 2352, the gas in the slot 2353 can be discharged outward through the vent 2344, making the assembly of the eccentric portion 235 and the frame 234 more convenient and effective.

[0135] In this embodiment, in the direction of the second axis A2, the second protrusion 2343, the fourth bearing 225 and the ring 2352 at least partially overlap; and in the direction of the second axis A2, the length of the second protrusion 2343 is less than the length of the fourth bearing 225, and the length of the fourth bearing 225 is less than the length of the ring 2352, so that the assembly effect between the eccentric portion 235 and the frame 234 is better.

[0136] In this embodiment, the plunger 88 has a recessed mounting groove 882 and a fifth bearing 885 disposed in the mounting groove 882. The eccentric shaft 2351 of the eccentric part 235 protrudes into the mounting groove 882 and is mounted on the fifth bearing 885 to drive the plunger 88 to move and perform water pumping operation.

[0137] Furthermore, the eccentric shaft 2351 of the aforementioned eccentric portion 235 has a third axis A3, and the third axis A3 and the second axis A2 are not collinear.

[0138] Alternatively, the aforementioned output component 23 can also be a one-piece component.

[0139] Please refer to the following: Figure 8 and Figure 9As shown, the transmission assembly 2 also includes a pressurizing mechanism 80 that abuts against the plunger 88. The pressurizing mechanism 80 is located inside the housing 21. The pump unit 4 has a pressure chamber 42 that houses the plunger 88. The pressurizing mechanism 80 and the pressure chamber 42 are located at both ends of the plunger 88, respectively. The pressurizing 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 pressurizing mechanism 80. In the second stage, the transmission assembly 2 drives the plunger 88 to pressurize the water in the pressure chamber 42, while the pressurizing mechanism 80 applies a force to the plunger 88 in the direction of the pressure chamber 42. Pump unit 4 is a single-cylinder pump, and the characteristics of a single-cylinder pump mean that the plunger 88 only performs work (i.e., pressurizes the water in the pressure chamber 42) for half of the cycle, resulting in low efficiency. In this embodiment, a booster mechanism 80 is provided at the end of the plunger 88 away from the pump unit 4, so that the plunger 88 stores energy in the booster mechanism 80 during the half-cycle when it does no work, and the stored energy is released back to the plunger 88 during the half-cycle when it does work, which greatly improves the working efficiency of the handheld high-pressure washer 100. In addition, the booster mechanism 80 can compensate for the torque of the plunger 88, so that even with the low performance of the motor assembly 1, a higher output pressure and flow rate can be obtained, effectively reducing the overall cost of the machine.

[0140] In this embodiment, the plunger 88 includes a guide rod 881 protruding from the end toward the pressurizing mechanism 80, the transmission assembly 2 includes a insert 44 mounted on the housing 21, the pressurizing mechanism 80 is a spring, one end of the pressurizing mechanism 80 is sleeved on the guide rod 881, and the other end abuts against the insert 44.

[0141] Please refer to the following: Figure 30 and Figure 31 As shown, the insert 44 includes a substrate 441, a retaining arm 442 connected to the substrate 441, a stepped surface 443 provided at the connection between the substrate 441 and the retaining arm 442, and an opening 444 penetrating the substrate 441. The retaining arm 442 is U-shaped, and the two arms of the retaining arm 442 abut against the pressurizing mechanism 80. The insert 44 is an integral structure.

[0142] Please combine Figure 6 As shown, the opening 444 is at least partially exposed on the outside of the housing 21 to facilitate the installation and removal of the insert 44.

[0143] Please combine Figure 3 and Figure 7 As shown, the stepped surface 443 abuts against the housing 21, one end of the clamping arm 442 abuts against the pressurizing mechanism 80, and the other end abuts against the inner wall of the housing 21.

[0144] Furthermore, the aforementioned housing 21 includes a movable cavity 215 extending along the first axis A1, an installation port 216 extending perpendicular to the first axis A1, and a stop portion 217 disposed within the installation port 216. The stepped surface 443 abuts against the stop portion 217 to limit the installation of the insert 44.

[0145] In this embodiment, the housing 21 includes a reinforcing rib 218 on its outer peripheral surface, and the mounting opening 216 is located at the end of the housing 21. The reinforcing rib 218 covers the outside of the mounting opening 216 so that the area where the insert 44 is located has higher strength and is less prone to damage.

[0146] In this embodiment, the plunger 88 reciprocates linearly along the first axis A1, and the pressurizing mechanism 80 also extends along the first axis A1 and applies a force to the plunger 88 along the first axis A1.

[0147] Please see Figure 8 and Figure 9 As shown, the pump unit 4 includes a pump body 41, an inlet valve assembly 7 disposed at the inlet end 10, a first check valve assembly located between the inlet valve assembly 7 and the pressure chamber 42, and a second check valve assembly located between the pressure chamber 42 and the outlet end 20. The pressure chamber 42 is formed inside the pump body 41. The first check valve assembly and the second check valve assembly are two identical check valve assemblies 6. An inlet channel 101 is formed between the inlet end 10 and the first check valve assembly 6, and an outlet channel 102 is formed between the second check valve assembly 6 and the outlet end 20.

[0148] The working principle of the handheld high-pressure washer 100 in this embodiment is as follows: an external water source is connected to the water inlet 10, and 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 the water in the pressure chamber 42 is pressurized under the action of the motor assembly 1 and the transmission assembly 2. The pressurized water flows through the water outlet channel 102 and is then sprayed outward from the water outlet 20.

[0149] Specifically, in the first stage, the plunger 88 moves away from the pressure chamber 42, the inlet end 10 opens, the inlet valve assembly 7 and the first one-way valve assembly open, the second one-way valve assembly closes, and the outlet end 20 closes, and water flows into the pressure chamber 42 from the inlet channel 101; in the second stage, the plunger 88 moves closer to the pressure chamber 42 and pressurizes the water in the pressure chamber 42, at which time the first one-way valve assembly closes while the second one-way valve assembly and the outlet end 20 open, and water flows out from the pressure chamber 42 through the outlet channel 102.

[0150] 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.

[0151] In this embodiment, the water outlet direction of the above-mentioned water outlet 20 is consistent with the extension direction of the first axis A1.

[0152] 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.

[0153] Please see Figure 8 As shown, a first sealing ring 103 is provided inside the pump body 41, and a second sealing ring 104 is provided inside the housing 21. Both the first sealing ring 103 and the second sealing ring 104 are sleeved on the outer periphery of the plunger 88 and are tightly fitted to the outer periphery of the plunger 88 to form a highly efficient sealing effect.

[0154] Please see Figures 3 to 5 As shown, the pump unit 4 also includes a tensioning member 45 that fixes the pump body 41 to the housing 21. The plunger 88 is located inside the housing 21 and extends to the pump body 41. The pump body 41 is made of plastic, the tensioning member 45 is made of metal, and the housing 21 can be made of either metal or plastic. By installing the pump body 41 to the housing 21 via the tensioning member 45, the pump body 41 can be effectively protected from damage even under high pressure and impact, while also meeting the user's demand for higher output pressure and flow rate.

[0155] In this embodiment, the tensioning member 45 includes a U-shaped body 451 covering the outside of the pump body 41, a pair of mounting arms 452 extending outward from both ends of the U-shaped body 451, and a positioning port 453 penetrating the bottom wall of the U-shaped body 451. The tensioning member 45 is fixed to the housing 21 via the pair of mounting arms 452.

[0156] Furthermore, the aforementioned housing 21 includes a mounting base 214 corresponding to the mounting arm 452, and a fastening bolt 46 passes through the mounting arm 452 and the mounting base 214 to fix the tensioner 45 to the housing 21.

[0157] In this embodiment, the water outlet 20 extends through the positioning port 453.

[0158] In this embodiment, the U-shaped body 451 is arranged symmetrically about the first axis A1, and the first axis A1 extends through the positioning port 453.

[0159] Please see Figures 32 to 34As shown, 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 disposed 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 passes through the valve seat 71, and the water inlet channel 101 includes an inlet side 781 for water to flow in, an outlet side 782 for water to flow out, and a water flow direction 783 from the inlet side 781 toward the outlet side 782. The water flow direction 783 extends approximately along a direction parallel to the second axis A2.

[0160] In this embodiment, the cavity 72 is located between the inlet side 781 and the 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 approximately 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 within the cavity 72.

[0161] In this embodiment, the aforementioned water inlet valve assembly 7 has a first state where water is not flowing and the water inlet channel 101 is open, a second state where water is flowing and the water inlet channel 101 is closed, and a third state where water is flowing and the water inlet channel 101 is open. Specifically, the first state is a state where no external water source is connected or an external water source without pressure is connected, at which time the valve ball 74 is not under force and does not block the water inlet channel 101; the second state is a state where an external water source is connected, at which time the valve ball 74 moves under the action of water pressure and blocks the water inlet channel 101; the third state is a state where the valve ball 74 is under force and moves, thereby opening the water inlet channel 101.

[0162] In this embodiment, the user can switch the water inlet valve assembly 7 from the second state to the third state by pressing the valve stem 75, which causes the valve ball 74 to move along the direction 731 perpendicular to the water flow direction 783. In the third state, the valve stem 75 causes the valve ball 74 to compress the first elastic element 73 so that the valve ball 74 does not block the water inlet channel 101.

[0163] By designing a novel inlet valve assembly 7, when an external pressurized water source is connected, the water pressure will push the valve ball 74 to automatically block the inlet channel 101. With a simple and low-cost structure, the water intake becomes controllable. When the handheld high-pressure washer 100 needs to be operated, pressing the valve stem 75 will open the inlet channel 101. The valve ball 74 has little impact on the water flow, resulting in less pressure loss and a larger instantaneous flow rate, effectively improving the overall performance of the machine. During the opening process, the user only needs to move the valve ball 74 with a slightly larger force at the beginning. As the inlet channel 101 is opened, the valve ball 74 is squeezed towards the first elastic element 73 under the action of water pressure. The user will then be able to press the valve stem 75 very easily. At the same time, the valve stem 75 is subjected to less force and is less likely to break, thus meeting the user's needs for larger water intake. In addition, the valve ball 74 rolls under the action of water flow. During the contact process with the valve seat 71, the wear of the valve ball 74 is more uniform, with good self-adaptability and high fault tolerance, and the service life is also improved.

[0164] Please see Figure 32 As shown, the valve seat 71 includes a guide post 711 protruding from the inner wall and a support 712 adjacent to the water inlet side 781. The guide post 711 extends into the cavity 72, and one end of the first elastic member 73 is sleeved on the guide post 711, and the other end abuts against the valve ball 74.

[0165] Please combine Figure 34 As shown, the cavity 72 has an inner cavity 721 that accommodates the first elastic member 73, and 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.

[0166] In the first state, the valve ball 74 is supported on the support 712; during the process of switching from the first state to the second state, the valve ball 74 is disengaged 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.

[0167] Please see Figure 33 As shown, the support 76 includes a base 761 mounted on the valve seat 71, a first protrusion 762 protruding outward from the outer periphery of the base 761, a first sealing member 763 disposed between the outer periphery of the base 761 and the valve seat 71, a second sealing member 764 disposed between the inner periphery of the base 761 and the valve stem 75, and a gasket 765 disposed 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 engaged with 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.

[0168] Please see Figure 35 and Figure 36As shown, the aforementioned one-way valve assembly 6 includes a valve body 61 with an inlet 62 and an outlet 63, a water flow channel 64 connecting the inlet 62 and the outlet 63, a bracket 65 mounted on the valve body 61, a valve core 66 disposed within the valve body 61, and a second elastic element 67 for the bias valve core 66. The valve core 66 has a first position that blocks the water flow channel 64 and a second position that does not block the water flow channel 64. In the first position, the valve core 66 abuts against the valve body 61 to perform a seal.

[0169] In this embodiment, the valve core 66 includes a head 661 abutting against the valve body 61, a rod 662 connected to the head 661, and a helical feature 663 disposed on the head 661. The helical feature 663 is disposed on the end face of the head 661 near the inlet 62, and the helical feature 663 and the rod 662 are located on opposite sides of the head 661. By providing the helical feature 663 on the head 661 of the valve core 66, the water source entering from the inlet 62 flows through the helical feature 663, which can drive the valve core 66 to rotate. This allows the head 661 to pivot adaptively during the contact between the valve core 66 and the valve body 61, resulting in high uniformity and more even wear on the entire surface of the head 661, and a significantly improved service life. In addition, the helical feature 663 is integrally formed on the head 661, resulting in a simple structure and low cost.

[0170] Please see Figures 38 to 40 As shown, the spiral feature 663 includes a guide head 6631 located at the center of the head 661 and a spiral portion 6632 extending spirally 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 inlet 62, and the top of the guide head 6631 is rounded. There are multiple spiral portions 6632, which are distributed at intervals around the guide head 6631.

[0171] In this embodiment, the spiral portion 6632 includes a proximal end 6633 near 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 a point.

[0172] Furthermore, the valve core 66 has a fourth axis A4, which extends through the guide head 6631, and the guide head 6631 is symmetrically distributed about the fourth axis A4.

[0173] Furthermore, in the direction of the fourth axis A4, the aforementioned guide head 6631 is closer to the water inlet 62 than the spiral part 6632, so that the water source entering from the water inlet 62 flows sequentially through the guide head 6631 and the spiral part 6632, thereby driving the entire valve core 66 to rotate, so that the wear of the valve core 66 is more uniform.

[0174] In this embodiment, the head 661 includes a contact surface 6611 that abuts against the valve body 61, and a spiral feature 663 is disposed 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.

[0175] In this embodiment, the second elastic element 67 is a spring. One end of the second elastic element 67 abuts against the head 661 and the other end abuts against the bracket 65. The rotation direction of the valve core 66 is the same as that of the second elastic element 67, and both are left-handed. Therefore, during the rotation of the valve core 66, the wear between the end of the second elastic element 67 and the surface of the head 661 is smaller, which is beneficial to improving the service life of the valve core 66.

[0176] Please see Figures 35 to 37 As shown, the valve core 66 also includes a third sealing ring 664 mounted on the head 661. In a first position, the third sealing ring 664 abuts against the surface of the valve body 61. By providing the third sealing ring 664 at the head 661 of the valve core 66, the third sealing ring 664 contacts the surface of the valve body 61 and forms a seal, further improving the sealing effect of the one-way valve assembly 6.

[0177] In this embodiment, the head 661 includes a receiving cavity 665 recessed from the contact surface 6611, and a third sealing ring 664 is disposed in the receiving cavity 665. The receiving cavity 665 includes a first wall surface 6651 away from the contact surface 6611, a second wall surface 6652 adjacent to the contact surface 6611, and a third wall surface 6653 connected between the first wall surface 6651 and the second wall surface 6652. The first wall surface 6651, the second wall surface 6652 and the third wall surface 6653 together form the receiving cavity 665.

[0178] In this embodiment, the second wall surface 6652 is a curved surface, and the second wall surface 6652 is in contact with the outer peripheral surface of the third sealing ring 664.

[0179] 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 improve the sealing effect of the third sealing ring 664.

[0180] Please see Figures 40 to 43As shown, the valve core 66 is connected to the bracket 65. The bracket 65 includes a bracket body 651, a seat 652 located inside the bracket body 651, a water channel 653 provided between the seat 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 652 and the bracket body 651. The seat 652 has a through hole 6521, and the rod 662 is supported in the hole 6521 and moves along the hole 6521.

[0181] Furthermore, the aforementioned seat 652 includes a support column 6522 extending from the end face toward the head 661, and the valve core 66 includes a cavity 666 recessed from the end face of the head 661 near the support 65. One end of the second elastic member 67 is sleeved on the outer periphery of the support column 6522, and the other end is received in the cavity 666.

[0182] Furthermore, the ends of the aforementioned hole 6521 and the ends of the aforementioned cavity 666 are respectively provided with chamfers 6523 and 6661.

[0183] Please combine Figure 36 As shown, the second protrusion 654 abuts against the valve body 61. There are multiple support arms 655 and multiple second protrusions 654, and the positions of the multiple second protrusions 654 correspond to the positions of the multiple support arms 655.

[0184] This invention improves the working efficiency of handheld high-pressure cleaners by setting a booster mechanism at the end of the plunger away from the pump unit. This allows the plunger to store energy in the booster mechanism during the half-cycle when it is not working, and release the stored energy back to the plunger during the half-cycle when it is working. In addition, the booster mechanism can compensate for the torque of the plunger, so that even with low performance of the motor components, a high output pressure and flow rate can be obtained, effectively reducing the overall cost of the machine.

[0185] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many other alternatives to the handheld high-pressure washer of this invention can be found without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. A handheld high-pressure washer, comprising a pump unit having an inlet and an outlet, a motor assembly, a transmission assembly connected to the motor assembly, and a plunger driven by the transmission assembly, the transmission assembly having a housing, the plunger being at least partially located within the housing and extending to the pump unit, the motor assembly driving the transmission assembly to cause the plunger to reciprocate within the pump unit; characterized in that: The transmission assembly includes a pressurizing mechanism abutting against the plunger. The pressurizing mechanism is located inside the housing. The pump unit has a pressure chamber that houses the plunger. The pressurizing mechanism and the pressure chamber are located at both ends of the plunger. The pressurizing mechanism is a spring. The pressurizing mechanism has a first stage of storing energy and a second stage of releasing energy. In the first stage, the transmission assembly drives the plunger to store energy in the pressurizing mechanism. In the second stage, the transmission assembly drives the plunger to pressurize the pressure chamber, and the pressurizing mechanism applies a force to the plunger toward the pressure chamber.

2. The handheld high-pressure washer according to claim 1, characterized in that: The plunger includes a guide rod extending from its end toward the pressurizing mechanism, the transmission assembly includes a insert mounted on the housing, one end of the spring is sleeved on the guide rod, and the other end abuts against the insert.

3. The handheld high-pressure washer according to claim 2, characterized in that: The insert includes a base plate, a locking arm connected to the base plate, and a stepped surface at the connection between the base plate and the locking arm. The stepped surface abuts against the housing. One end face of the locking arm abuts against the pressurizing mechanism, and the other end face abuts against the inner wall surface of the housing.

4. The handheld high-pressure washer according to claim 3, characterized in that: The insert includes a slot that extends through the substrate, and the slot is at least partially exposed on the outside of the housing.

5. The handheld high-pressure washer according to claim 3, characterized in that: The clamping arm is U-shaped and has two parallel arms, and the pressurizing mechanism abuts against the two arms of the clamping arm.

6. The handheld high-pressure washer according to claim 3, characterized in that: The housing includes a movable cavity extending through the housing along a first axis, a mounting port extending through the housing perpendicular to the first axis, and a stop portion disposed within the mounting port. The pressurizing mechanism is housed within the movable cavity, and the stepped surface passes through the mounting port and abuts against the stop portion.

7. The handheld high-pressure washer according to claim 6, characterized in that: The housing includes reinforcing ribs on its outer periphery, and the mounting opening is located at the end of the housing, with the reinforcing ribs covering the outside of the mounting opening.

8. The handheld high-pressure washer according to claim 1, characterized in that: The transmission assembly includes a reduction mechanism connected to the motor assembly and an output component connected to the reduction mechanism. The output component drives the plunger to reciprocate. The reduction mechanism includes planetary gears connected to the motor assembly and a gear ring meshing with the planetary gears. Fasteners pass through the housing and the gear ring to lock the housing and the gear ring.

9. The handheld high-pressure washer according to claim 8, characterized in that: The gear ring includes a gear ring body that meshes with the planetary gear, a lip that extends axially from the end face of the gear ring body, and a snap-fit ​​post that extends radially outward from the outer periphery of the gear ring body. The lip abuts against the inner side of the housing, and fasteners pass through the housing and the snap-fit ​​post to fix the housing and the gear ring.

10. The handheld high-pressure washer according to claim 1, characterized in that: The plunger has a first axis, and the motor assembly has a second axis, the first axis being perpendicular to the second axis. In the first stage, the inlet is open and the outlet is closed, and the plunger moves away from the pressure chamber. In the second stage, the inlet is closed and the outlet is open, and the plunger moves closer to the pressure chamber.

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