CN110145447B

CN110145447B - Motor pump unit for handheld high-pressure cleaning machine and handheld high-pressure cleaning machine

Info

Publication number: CN110145447B
Application number: CN201910353066.1A
Authority: CN
Inventors: 林有余; 刘楷; 蔡济波; 吴玉华; 汪洋
Original assignee: Jiangsu Sumec Hardware and Tools Co Ltd
Current assignee: Jiangsu Sumec Hardware and Tools Co Ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-04-14
Anticipated expiration: 2039-04-29
Also published as: CN110145447A; WO2020220504A1

Abstract

The invention discloses a hand-held high-pressure cleaning machine, a motor pump unit comprises: the motor comprises a motor shell, a motor shaft, a rotor and a stator core, wherein the rotor is arranged on the motor shaft, the stator core is positioned outside the rotor, and the rotor and the stator core are arranged in the motor shell; the mini pump comprises a pump shell, a pump water inlet and a high-pressure water outlet which are arranged on the pump shell; the motor shell is provided with a sealing cavity I and an inner shell positioned at the inner ring of the sealing cavity I, and the stator core is tightly attached to the inner shell to form a heat conduction channel; the motor shell is provided with at least one cooling channel I, a water inlet I and a water outlet I; the water inlet I is connected with an external water source, and the water outlet I is communicated with the water inlet of the pump; the pump shell is provided with at least one cooling channel II, a water inlet II and a water outlet II; the water inlet II is connected with an external water source or the water outlet I, and the water outlet II is connected with the water inlet of the pump. The invention has the following beneficial effects: the waterproof grade of the motor and the whole machine can reach IPX7 and is even higher, and the machine is safer and more reliable.

Description

Motor pump unit for handheld high-pressure cleaning machine and handheld high-pressure cleaning machine

Technical Field

The invention belongs to the technical field of handheld cleaning machines, and particularly relates to a motor pump unit for a handheld high-pressure cleaning machine and the handheld high-pressure cleaning machine.

Background

The high-pressure cleaning machine is a device which uses water or mixed liquid added with a cleaning agent as a cleaning medium and utilizes high-pressure water flow to clean the surface of an object, the high-pressure cleaning machine can be used for cleaning automobiles, courtyards, the ground, railings, doors and windows and the like, the use is more efficient and convenient, the high-pressure cleaning machine mainly comprises a spray gun and a host, the host comprises a motor, a pump, a battery or an external power line, the spray gun is connected with the host through a water pipe, the spray gun is used for forming water flows with different shapes according to actual needs, the host is used for converting the water into the high-pressure water flow from municipal tap water or a water bucket and conveying the high-pressure water flow to the spray gun, the host is usually fixedly placed or movably placed on the ground, the host has larger volume and heavier weight, the use process.

Patent US20090045271a1 discloses a hand-held electric pressure washer, including pump 16, motor 14, casing 20, and handle 62 and side handle 68 that link to each other with casing 20, nozzle 58 is connected to casing 20 through rifle bar 54, this patent actually discloses a low pressure cleaning machine, its pressure can't reach the high pressure cleaning machine requirement, because the international standard definitely defines the high pressure cleaning machine as operating pressure more than or equal to 2.5MPa, the operating pressure can reach the high pressure cleaning purpose only when in actual use exceeding 2.5MPa, because the high pressure cleaning machine directly contacts with water, the requirement of the corresponding hand-held high pressure cleaning machine waterproof grade in the standard is not less than IPX7, require the machine to be put under water and can work for a short time. According to the technical scheme disclosed by the patent US20090045271A1, the tail of the motor 14 is provided with the cooling fan blade 18, the corresponding position of the casing 20 is provided with the plurality of ventilation openings 22, the waterproof grade of the handheld electric pressure cleaning machine can not meet the requirement of the handheld high-pressure cleaning machine due to the ventilation openings 22, and the temperature rise and the noise can not be effectively controlled. The market really needs a handheld high-pressure cleaning machine, and the contradiction between motor cooling and water prevention is an industry difficult problem which cannot be solved all the time.

Patent CN205570600U also discloses a hand-held cleaning machine, which aims to improve the portability of the cleaning machine and solve the problem of moving convenience. The technical solution is different from the patent US20090045271a1 in that US20090045271a1 is connected to an external power source through a power cord 30, the external power source supplies power to the motor 14, and the CN205570600U machine includes a battery 170, the battery supplies power, and the battery replaces the external power source. The patent CN205570600U discloses is also only a low pressure cleaner, not handheld high pressure cleaner, its operating pressure can't reach and exceed the required 2.5MPa pressure of high pressure cleaner, CN205570600U does not disclose any motor cooling and waterproof sealed solution, it is not handheld high pressure cleaner that it provides, can see the existence of motor afterbody cooling wind gap from CN205570600U description attached drawing, the corresponding position must leave the vent on the casing, its waterproof grade can't reach the waterproof grade requirement of handheld high pressure cleaner, and there are noise pitch, defect and not waterproof etc. and not enough.

As a handheld cleaning machine, the high-speed operation of a motor and a pump can bring about the sharp rise of temperature, the temperature is transmitted to a user through a shell, the comfort in use is seriously affected by the high-temperature hand scalding, and the operation efficiency and the service life of the machine are affected. Meanwhile, the noise generated by the operation of the open type casing and the motor and the rotation of the fan blade also directly influences the operation comfort of the user.

Therefore, it is particularly necessary to design a handheld high-pressure cleaning machine which is convenient to move, can be directly connected to an external water source through a water pipe, has pressure meeting the requirements of the high-pressure cleaning machine, has a waterproof grade meeting the requirements of the handheld high-pressure cleaning machine, and has high cleaning capability, high operation efficiency, low temperature and silence.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a handheld high-pressure cleaning machine which has the characteristics of good cooling effect, low operation noise, high cleaning pressure and strong waterproof capability.

In order to solve the problems of the prior art, the invention discloses a motor pump unit for a handheld high-pressure cleaning machine, which comprises: the miniature motor with the outer diameter not exceeding 90mm comprises a motor shell, a motor shaft, a rotor and a stator core, wherein the rotor is arranged on the motor shaft, the stator core is positioned outside the rotor, and the rotor and the stator core are arranged in the motor shell;

the mini pump comprises a pump shell, a pump water inlet and a high-pressure water outlet;

the motor shell is provided with a sealing cavity I and an inner shell, and the inner surface of the inner shell is tightly attached to the stator core to form a heat conduction channel; the motor shell is provided with at least one cooling channel I passing through the inner shell, a water inlet I communicated with one end of the cooling channel I and a water outlet I communicated with the other end of the cooling channel I; the water inlet I is connected with an external water source, and the water outlet I is communicated with the water inlet of the pump;

the pump shell is provided with at least one cooling channel II, a water inlet II communicated with one end of the cooling channel II and a water outlet II communicated with the other end of the cooling channel II; the water inlet II is connected with an external water source or the water outlet I, and the water outlet II is connected with the water inlet of the pump.

Furthermore, when the number of the cooling channels I is more than two, the motor shell is also provided with a flow dividing channel communicated with the water inlet end of the cooling channel I and a flow converging channel communicated with the water outlet end of the cooling channel I.

Further, the cooling passage I extends in a direction parallel to the axis of the motor case, the flow dividing passage extends in a direction parallel to the diameter of the motor case, and the flow converging passage extends in the circumferential direction of the motor case.

Furthermore, the motor shell comprises an end cover and a shell which are axially connected in a sealing manner, the shell is a tank-shaped body with one end open and the other end closed, the end cover is arranged at the opening of the shell in a sealing manner, and the end cover is connected with the mini pump; the water inlet I, the cooling channel, the flow dividing channel and the flow converging channel are all arranged on the machine shell, and the water outlet I is arranged on the end cover.

Furthermore, an annular groove formed by extending along the circumferential direction is formed at the opening of the shell, and the end cover is connected with the annular groove in a sealing manner to form a confluence channel.

Furthermore, a bearing II is arranged in a center hole of the end cover, a bearing I is arranged in a center hole of the shell, and two ends of the motor shaft are respectively arranged in the bearing I and the bearing II; the bypass passage passes from near the outside of the housing where the bearing I is mounted.

Further, the casing is a structure integrally formed.

Further, the outer surface of the cooling channel I is provided with a plurality of heat conducting ribs I extending towards the outer surface of the motor shell.

Furthermore, a leading-out hole for leading out a motor wire is formed in the motor shell, and the motor wire is arranged at the leading-out hole in a sealing mode.

Furthermore, the micro motor is a rare earth permanent magnet brushless motor, the waterproof grade of the micro motor is not lower than IPX7, and the minimum working pressure of the mini pump is not lower than 2.5 Mpa.

Furthermore, the water inlet II is positioned at the position which is far away from the near end of the micro motor, and the water outlet II is positioned at the position which is far away from the far end of the micro motor;

when the cooling channel II extends along the direction parallel to the axis of the pump shell, the outer surface of the cooling channel II is provided with a plurality of heat conducting ribs II extending to the outer surface of the pump shell; when the cooling channel II extends along the circumferential direction of the pump housing, the outer surface of the cooling channel II is provided with a plurality of heat conducting ribs III extending to the outer surface of the pump housing.

Further, the pump casing is including connecting pump head and the pump casing in order to form seal chamber II around, and cooling channel II, delivery port II and water inlet II all locate on the pump casing.

Furthermore, an end cover is arranged at one end of the pump shell close to the micro motor and connected with the micro motor.

Furthermore, the mini pump is a plunger pump, and the mini pump further comprises at least one plunger and a swash plate, wherein the plunger and the swash plate are both arranged in a sealing cavity II of the pump shell, and the swash plate is driven by the micro motor to drive the plunger to move along a straight line.

Further, the mini-pump is connected coaxially or at an angle to the micro-motor.

Further, the pump housing of the mini-pump is connected with the motor housing of the micro-motor through a snap.

Furthermore, a speed reducing mechanism is arranged between the mini pump and the micro motor, and the speed reducing mechanism is a planetary gear speed reducing mechanism and is arranged in an end cover connected between the mini pump and the micro motor.

The invention also discloses a hand-held high pressure cleaner, comprising: a housing and a spray gun;

still include foretell hand-held type motor pump unit for high pressure cleaner, the motor pump unit is wrapped up in the shell seal, and the high pressure delivery port is connected to the spray gun.

Furthermore, the shell is provided with an accommodating part and a handheld part which are integrally connected, the motor pump unit is arranged in the accommodating part, the handheld part extends obliquely along the direction deviating from the accommodating part, and the handheld part is provided with a power switch.

Furthermore, the handheld high-pressure cleaning machine also comprises a battery pack, and the rated voltage of the battery pack is 18-60V; the battery package is located in handheld portion or the detachable waterproof storehouse of locating handheld portion tip, and waterproof storehouse is equipped with waterproof storehouse lid, and waterproof storehouse lid passes through the sealing strip and forms sealedly with waterproof storehouse.

Furthermore, the handheld high-pressure cleaning machine also comprises a battery pack, and the rated voltage of the battery pack is 18-60V; the battery pack is connected with the end part of the handheld part in a sealing and plugging manner.

Further, the weight of the handheld high-pressure cleaning machine is not more than 4.2kg, and the waterproof grade of the handheld high-pressure cleaning machine is not lower than IPX 7.

The invention has the following beneficial effects:

1. in the invention, the micro motor adopts water cooling to replace the existing air cooling, so that the waterproof grade of the motor and the whole machine can reach IPX7 or even higher through a sealing design (namely no air port is arranged on the shell), the machine is safer and more reliable, the waterproof requirement of the handheld high-pressure cleaning machine is met, the water cooling is carried out on the pump body while the water cooling is carried out on the motor, the temperature of the pump is further reduced, the whole temperature rise is reduced, and the service life of the whole machine is synchronously prolonged.

2. According to the invention, the motor is cooled by non-circulating water, the cooling effect is greatly improved, the temperature of the motor is obviously reduced, the heating problem of the motor is effectively solved, the efficiency of the motor is improved, the output pressure and flow are improved under the condition of consuming the same power, the water outlet pressure can reach or even exceed 2.5MPa, the cleaning capacity is obviously improved, and the application range is widened on the basis of being more convenient.

3. According to the invention, after the water cooling scheme is adopted for the permanent magnet motor or the rare earth permanent magnet brushless motor, the temperature of the permanent magnet material of the motor is well controlled, the problem of high-temperature demagnetization of the permanent magnet or the rare earth permanent magnet material is effectively solved, the motor failure caused by irreversible demagnetization is effectively prevented, and the reliability of the motor is greatly improved.

4. In the invention, after the motor is cooled by water, the noise of the fan blades is avoided, and as the motor shell is closed and the shell is not provided with any air inlet and air outlet, the motor becomes more silent, the volume is more compact, and the noise is effectively prevented from damaging people.

Drawings

FIG. 1 is a schematic structural view of a preferred embodiment of the present invention;

FIG. 2 is a perspective view of the motor pump unit of the embodiment of FIG. 1;

FIG. 3 is a front view of the motor pump unit of the embodiment shown in FIG. 1 (with the motor separated from the mini pump);

FIG. 4 is a front view of the motor pump unit of the embodiment shown in FIG. 1 (with the motor connected to the mini pump);

FIG. 5 is a right side elevational view of the motor pump unit of the embodiment of FIG. 1;

FIG. 6 is a cross-sectional view of the motor pump unit of the embodiment of FIG. 1;

FIG. 7 is a cross-sectional view taken along section line AA in FIG. 6;

FIG. 8 is a cross-sectional view taken along section line BB in FIG. 6;

FIG. 9 is a perspective view of the construction of the pump casing of the embodiment of FIG. 1;

FIG. 10 is a perspective cross-sectional view of the motor of the embodiment of FIG. 1;

fig. 11 is a partial enlarged view at C in fig. 10.

Reference numerals:

1, plunger piston; 2, sealing the cavity II; 3 pump casing; 4, a speed reducing mechanism; 5, end cover; 6, a machine shell; 7 a stator core; 8, a rotor; 9 motor shaft; 10 connecting pipes; 11 bearing I; 12 bearing II; 13 pump water inlet; 14 high-pressure water outlet; 15 a flow dividing channel; 16 heat conducting ribs III; 17 cooling channel I; 18 a sink channel; 19 a water inlet I; 20 a motor pump unit; 21 a mini pump; 22 a micro-motor; 23 water outlet I; 24 cooling channel II; 25 water inlet II; 26 water outlet II; 27 a water outlet joint; 28 connecting the pipe joints; 29 a motor housing; 30 sealing the cavity I; 31 heat conducting ribs I; 32 heat conducting ribs II; 33 a swash plate; 34, buckling; 35 a hand-held high pressure cleaner; 36 a housing; 37 a hand-held portion; 38 a spray gun; 39 a battery pack; 40 waterproof bin; 41 waterproof bin cover; 42 a sealing strip; 43 a pump head; 44 a power switch; 45 water inlet joint sealing rings; 46 water inlet joint; 47 water inlet pipe connector; 48 water inlet pipes; 49 a first seal ring; 50 a second seal ring; 51 motor leads; 52 an inner shell; 53 inner wall of end cap; 54 an outer wall of the end cap; 56 shell outer wall; 57 a water outlet joint sealing ring; 58 pump housing; 59 an annular groove; 60 a housing part; the direction indicated by the arrow in the figure is the water flow direction.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 11, a hand-held high pressure cleaner 35 includes: the spray gun 38, the motor pump unit 20 and the casing 36, the casing 36 is sealed and wrapped around the motor pump unit 20.

The motor pump unit 20 comprises a mini-pump 21 and a micro-motor 22 with an outer diameter not exceeding 90mm, wherein the micro-motor 22 is connected with the mini-pump 21 so as to drive the mini-pump 21 to work, and the connection here means that the micro-motor 22 and the mini-pump 21 are structurally connected to realize the fixation in the shell 36 on one hand, and the micro-motor 22 and the mini-pump 21 are connected to realize the transmission of torque on the other hand.

The mini-pump 21 has a pump inlet 13 and a high pressure outlet 14. The high-pressure water outlet 14 is connected with the spray gun 38 so as to spray high-pressure water flow in a certain form, thereby realizing the adjustment of the cleaning range.

The micro-motor 22 includes a motor housing 29; the motor shell 29 is internally provided with a motor shaft 9, a rotor 8 and a stator core 7; both ends of the motor shaft 9 are rotatably installed in the motor housing 29 by a bearing I11 and a bearing II12, respectively, the rotor 8 is installed on the motor shaft 9 to transmit torque, the stator core 7 is located outside the rotor 8, and torque is generated by an electromagnetic principle to rotate the rotor 8. The motor housing 29 has a sealed chamber I30 and an inner housing 52, the inner housing 52 surrounds the outer periphery of the stator core 7 and holds the stator core 7 against the inner housing 52 to form a heat conduction path, and heat generated by the stator core 7 is thus conducted to the inner housing 52 for subsequent heat dissipation.

For the purpose of water-cooling heat dissipation, the motor housing 29 is provided with at least one cooling channel I17 passing through the inner housing 52, especially the outer surface thereof, a water inlet I19 communicating with one end of the cooling channel I17, and a water outlet I23 communicating with the other end of the cooling channel I17, a water inlet joint 46 is hermetically mounted at the water inlet I19 through a water inlet joint sealing ring 45, and the connection with a water inlet pipe connector 47 of a water inlet pipe 48 can be realized through the water inlet joint 46.

The other end of the water inlet pipe 48 is connected with an external water source, a water outlet joint 27 is arranged at the water outlet I23 through a water outlet joint sealing ring 57, and the water outlet joint 27 can be directly communicated with the pump water inlet 13 through a connecting pipe 10. When not pressurized, the washing water from the external water source is first used as cooling water in the cooling channel I17 to absorb heat from the stator core 7 conducted to the inner casing 52, and then enters the mini-pump 21 to be pressurized to form a high-pressure water flow for washing. Because the water cooling mode is adopted, the whole shell 36 has no air cooling opening, can be completely sealed to reach a higher waterproof grade IPX7, and meets the standard of a handheld high-pressure cleaning machine. In addition, because the cooling capacity of the water cooling mode is improved, the power of the micro motor 22 can also be improved, so that the water outlet pressure of the mini pump 21 reaches the high pressure standard, namely not lower than 2.5MPa, and the cleaning capacity is greatly improved.

In order to further improve the cooling capacity, the number of the cooling channels I17 may be two or more, and in this case, for the convenience of water inlet and outlet, the motor housing 29 is further provided with a branch channel 15 communicating with the water inlet end of the cooling channel I17 and a confluence channel 18 communicating with the water outlet end of the cooling channel I17. The cooling water enters the diversion channel 15 through the water inlet I19, then is diverted into each cooling channel I17 to cool the motor housing 29, and then is discharged to the mini pump 21 from the water outlet I23 after being collected by the confluence channel 18.

In order to ensure the cooling effect and facilitate the manufacturing, the motor housing 29 includes an end cover 5 and a housing 6 which are axially and hermetically connected to form a sealed cavity I30, the housing 6 is a can body which is open at one end and closed at the other end, the end cover 5 is hermetically installed at the opening of the housing 6, and the end cover 5 is connected with the mini pump 21 to realize the connection and fixation of the motor 29 and the mini pump 21. The end cap 5 is close to the mini pump 21, and the casing 6 is far away from the mini pump 21; the water inlet I19, the cooling channel 17, the flow dividing channel 15 and the flow converging channel 18 are all arranged on the machine shell 6, and the water outlet I23 is arranged on the end cover 5. As a typical configuration, the cooling passage I17 extends in a direction parallel to the axis of the casing 6, the flow dividing passage 15 extends in a direction parallel to the diameter of the casing 6, and the flow converging passage 18 extends in the circumferential direction of the casing 6.

Since the motor housing 29 is of an axially split structure, the collecting flow channel 18 can be provided, as shown in fig. 10 and 11, an annular groove 59 is formed at the opening of the housing 6 and extends along the circumferential direction of the housing, the inner side of the annular groove 59 is the inner housing 52, the outer side of the annular groove is formed into a ring of housing outer wall 56, similarly, the end cover 5 is also provided with a ring of end cover inner wall 53 and a ring of end cover outer wall 54, the end cover inner wall 53 is in sealing connection with the inner housing 52 through the first sealing ring 49, the end cover outer wall 54 is in sealing connection with the housing outer wall 56 through the second sealing ring 50, and the annular groove 59 forms the collecting flow channel.

In order to realize the installation of the motor shaft 9, a bearing II12 is installed in the central hole of the end cover 5, a bearing I11 is installed in the central hole of the machine shell 6, and two ends of the motor shaft 9 are respectively installed in the bearing I11 and the bearing II 12.

Since there are locations on the motor housing 29 where the cooling channel I17 is not located, in order to achieve heat dissipation at these locations, the outer surface of the cooling channel I17 is provided with a plurality of heat conducting ribs I31 extending toward the outer surface of the motor housing 29, and the heat conducting ribs I31 may extend to the housing 6 or the end cap 5, thereby achieving further improvement in cooling capacity.

In order to increase the pressurizing capacity of the mini pump 21, a speed reduction mechanism 4 is provided between the mini pump 21 and the micro motor 22. The end cap 5 has a cylindrical structure and thus has a receiving cavity, and the speed reducing mechanism 4 is disposed in the receiving cavity of the end cap 5. The reduction mechanism 4 is a planetary gear reduction mechanism. The micro motor 22 is a rare earth permanent magnet brushless motor.

In order to further improve the cooling capacity of the motor pump unit 20, the mini pump 21 also performs heat dissipation by a water cooling method. In particular, the mini-pump 21 is a plunger pump comprising at least one plunger 1, a swash plate 33 and a pump housing 58, preferably three plungers 1. The pump housing 58 has a sealed chamber II2, the sealed chamber II2 contains the plunger 1, the swash plate 33 and the lubricant coolant, the plunger 1 reciprocates in the plunger chamber, one end of the plunger in the sealed chamber II2 is in sliding contact with the disc surface of the swash plate 33, and the swash plate 33 is driven by the micro motor 22 to drive the plunger 1 to move linearly.

The pump housing 58 is provided with at least one cooling channel II24, a water inlet II25 communicated with one end of the cooling channel II24 and a water outlet II26 communicated with the other end of the cooling channel II24, the water inlet II25 can be directly connected with an external water source through a water inlet pipe 48, and can also be connected with the water outlet I23 through a water outlet connector 27, and when the latter mode is adopted for connection, the water outlet I23 is not required to be connected with the pump water inlet 13 through a connecting pipe 10. The water outlet II26 is connected to the connector 18 of the connector pipe 10 so that the cooling water enters the pump water inlet 11 through the connector pipe 10. The water flow enters the cooling channel II24 through the water inlet pipe 48, and the heat generated by the operation of the internal mechanical components during the operation of the mini-pump 21 is conducted to the pump housing 58 through the lubricating coolant, then conducted to the cooling channel II24, and finally taken away by the cooling water flowing in the cooling channel II24, so that the heat dissipation with higher efficiency is realized.

When the micro motor 22 and the mini pump 21 both adopt a water cooling mode for heat dissipation, cooling water can independently enter the cooling channel I17 and the cooling channel II24 for heat dissipation of the micro motor and the mini pump, and can also enter the cooling channel I17 and the cooling channel II24 for heat dissipation of the micro motor and the mini pump in sequence.

The pump housing 58 comprises a pump head 43 and a pump housing 3 which are connected in a front-back manner to form a sealed cavity II2, and a cooling channel II24, a water inlet II25 and a water outlet II26 are arranged on the pump housing 3. Various valves and plungers 13 are installed in the pump head 43, and a swash plate 14 is installed in the pump housing 3.

The water inlet II25 is located at a proximal position from the micro-motor 22 and the water outlet II26 is located at a distal position from the micro-motor 22. As shown in fig. 9, when the cooling passage II24 extends in a direction parallel to the axis of the pump casing 3, in order to better conduct the heat of the pump casing 3 to the cooling passage II24, the outer surface of the cooling passage II24 is provided with a plurality of heat conductive ribs II32 extending circumferentially to the outer surface of the pump casing 3. When the cooling channel II24 extends in the circumferential direction of the pump casing 3, the outer surface of the cooling channel II24 is provided with a plurality of heat conducting ribs III16 extending axially to the outer surface of the pump casing 3. The pump housing 3 may also have two extending cooling passages II24, and the circumferentially extending cooling passage II24 is provided at an end of the pump housing 3 close to the micro-motor 22, and is substantially an annular groove provided at an end face of the end, which is sealed by the end cap 5 when the end is connected to the end cap 5 to form a cooling passage II24 for the cooling water to flow therein. The axially extending cooling passage II24 may communicate with the circumferentially extending cooling passage II24 and the water outlet II 26.

The mini-pump 21 and the micro-motor 22 may be connected coaxially to reduce the radial dimension, and may be connected at an angle, preferably perpendicularly, to reduce the axial dimension. The mini-pump 21 and the micro-motor 22 can be connected by a snap 34, thereby further reducing the overall size.

As shown in fig. 1, the housing 36 has an accommodating portion 60 and a hand-held portion 37 integrally connected, the mini pump 21 and the micro motor 22 are disposed in the accommodating portion 60, the hand-held portion 37 extends obliquely in a direction away from the accommodating portion 60, and the hand-held portion 37 is provided with a power switch 44. The power switch 44 is connected in the power supply circuit to realize the start-stop control of the whole machine.

In order to improve the application range of the cleaning machine and reduce external cables, the cleaning machine can adopt a self-powered mode, specifically, the handheld high-pressure cleaning machine 35 further comprises a battery pack 39, and the rated voltage of the battery pack 39 is 18-60V; the battery pack 39 is arranged in the hand-held part 37 or detachably arranged in a waterproof bin 40 at the end part of the hand-held part 37, and the waterproof bin 40 is provided with a waterproof bin cover 41. The waterproof bin cover 41 can be opened and closed by adopting a sliding mode and the waterproof bin 40 can be opened and closed by adopting a pivoting mode, so that the battery pack 39 can be taken and placed conveniently. The waterproof bin cover 41 forms a seal with the waterproof bin 40 through a sealing strip 42. As an alternative, the battery pack 39 is connected with the end of the handheld portion 37 in a sealed plug-in manner, specifically, the handheld portion 37 is provided with a contact, a contact is also arranged at a position corresponding to the battery pack 39, and after the battery pack 39 is inserted in place, the contacts of the battery pack 39 and the handheld portion are connected to form a complete power supply loop, and meanwhile, the waterproof requirement is met.

The casing 6 is provided with a lead-out hole for leading out the motor lead 51, and the motor lead 51 is arranged at the lead-out hole in a sealing way, so that the inside of the motor is ensured to be in a sealing state, and the electrical safety is ensured.

In order to improve the hand-holding experience, the size of the accommodating portion 60 of the housing 36 should not be too large, so the outer diameter of the stator core 7 does not exceed 90mm, and further, the outer diameter of the stator core 7 is 38-58 mm. Likewise, to reduce the fatigue associated with hand-held use, the hand-held high pressure cleaner 35 weighs no more than 4.2 kilograms.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A motor pump unit (20) for a hand-held high pressure cleaner, comprising:

the miniature motor (22) with the outer diameter not exceeding 90mm, wherein the miniature motor (22) comprises a motor shell (29), a motor shaft (9), a rotor (8) and a stator core (7), the rotor (8) is installed on the motor shaft (9), and the stator core (7) is positioned outside the rotor (8);

a mini-pump (21), the mini-pump (21) comprising a pump housing (58), a pump water inlet (13) and a high pressure water outlet (14);

the method is characterized in that:

the motor shell (29) is provided with a sealed cavity I (30) and an inner shell (52), the rotor (8) and the stator core (7) are arranged in the sealed cavity I (30), and the inner surface of the inner shell (52) is tightly attached to the stator core (7) to form a heat conduction channel; the motor shell (29) is provided with at least one cooling channel I (17) passing through the inner shell (52), a water inlet I (19) communicated with one end of the cooling channel I (17) and a water outlet I (23) communicated with the other end of the cooling channel I (17); the water inlet I (19) is connected with an external water source, and the water outlet I (23) is communicated with the water inlet (13) of the pump;

the pump shell (58) is provided with at least one cooling channel II (24), a water inlet II (25) communicated with one end of the cooling channel II (24) and a water outlet II (26) communicated with the other end of the cooling channel II (24); the water inlet II (25) is connected with an external water source or the water outlet I (23), and the water outlet II (26) is connected with the water inlet (13) of the pump.

2. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 1, characterized in that: when the number of the cooling channels I (17) is more than two, the motor shell (29) is also provided with a flow dividing channel (15) communicated with the water inlet end of the cooling channel I (17) and a flow converging channel (18) communicated with the water outlet end of the cooling channel I (17).

3. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 2, characterized in that: the cooling channel I (17) extends in a direction parallel to the axis of the motor housing (29), the flow dividing channel (15) extends in a direction parallel to the diameter of the motor housing (29), and the flow converging channel (18) extends in the circumferential direction of the motor housing (29).

4. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 2, characterized in that: the motor shell (29) comprises an end cover (5) and a shell (6) which are axially connected in a sealing way to form the sealing cavity I (30), the shell (6) is a pot-shaped body with one open end and the other closed end, the end cover (5) is mounted at the opening of the shell (6) in a sealing way, and the end cover (5) is connected with the mini pump (21); the water inlet I (19), the cooling channel (17), the flow dividing channel (15) and the flow converging channel (18) are all arranged on the machine shell (6), and the water outlet I (23) is arranged on the end cover (5).

5. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 4, characterized in that: an annular groove (59) formed by extending along the circumferential direction of the opening of the machine shell (6) is formed in the opening of the machine shell, and the end cover (5) is connected with the annular groove (59) in a sealing mode to form the confluence channel (18).

6. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 4, characterized in that: a bearing II (12) is arranged in a center hole of the end cover (5), a bearing I (11) is arranged in a center hole of the machine shell (6), and two ends of the motor shaft (9) are respectively arranged in the bearing I (11) and the bearing II (12); the flow dividing passage (15) passes through the vicinity of the outside of the housing (6) where the bearing I (11) is installed.

7. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 4, characterized in that: the shell (6) is an integrally formed structural body.

8. Motor pump unit (20) for a hand-held high-pressure washer, according to any of claims 1 to 7, characterized in that: the outer surface of the cooling channel I (17) is provided with a plurality of heat conducting ribs I (31) extending towards the outer surface of the motor shell (29).

9. Motor pump unit (20) for a hand-held high-pressure washer, according to any of claims 1 to 7, characterized in that: the motor shell (29) is provided with a lead-out hole for leading out a motor lead (51), and the motor lead (51) is arranged at the lead-out hole in a sealing mode.

10. Motor pump unit (20) for a hand-held high-pressure washer, according to any of claims 1 to 7, characterized in that: the miniature motor (22) is a rare earth permanent magnet brushless motor, the waterproof grade of the miniature motor (22) is not lower than IPX7, and the minimum working pressure of the mini pump (21) is not lower than 2.5 Mpa.

11. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 1, characterized in that: the water inlet II (25) is positioned at a near end position away from the micro motor (22), and the water outlet II (26) is positioned at a far end position away from the micro motor (22);

when the cooling channel II (24) extends along the direction parallel to the axis of the pump shell (58), the outer surface of the cooling channel II (24) is provided with a plurality of heat conducting ribs II (32) extending to the outer surface of the pump shell (58); when the cooling channel II (24) extends in the circumferential direction of the pump housing (58), the outer surface of the cooling channel II (24) is provided with a plurality of heat conducting ribs III (16) extending to the outer surface of the pump housing (58).

12. Motor pump unit (20) for a hand-held high-pressure washer according to claim 11, characterized in that: the pump casing (58) comprises a pump head (43) and a pump casing (3) which are connected in a front-back mode to form a sealed cavity II (2), and the cooling channel II (24), the water outlet II (26) and the water inlet II (25) are all arranged on the pump casing (3).

13. Motor pump unit (20) for a hand-held high-pressure washer according to claim 11, characterized in that: an end cover (4) is arranged at one end, close to the micro motor (22), of the pump shell (3), and the end cover (4) is connected with the micro motor (22).

14. Motor pump unit (20) for a hand-held high-pressure washer, according to any of claims 1, 11-13, characterized in that: the mini pump (21) is a plunger pump, and further comprises at least one plunger (1) and a swash plate (33), wherein the plunger (1) and the swash plate (33) are arranged in a sealing cavity II (2) of the pump shell (58), and the swash plate (33) is driven by the micro motor (22) to drive the plunger (1) to move along a straight line.

15. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 1, characterized in that: the mini pump (21) is coaxially connected with the micro motor (22) or connected with a certain angle.

16. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 1, characterized in that: the pump shell (58) of the mini pump (21) is connected with the motor shell (29) of the micro motor (22) through a buckle (34).

17. Motor pump unit (20) for a hand-held high-pressure washer, according to claim 1, characterized in that: still be equipped with reduction gears (4) between mini pump (21) and micro motor (22), reduction gears (4) are planetary gear reduction gears and locate to be connected mini pump (21) with in end cover (5) between micro motor (22).

18. A hand-held high pressure cleaner (35) comprising:

a housing (36) and a lance (38);

the method is characterized in that: the motor pump unit (20) for the hand-held high-pressure washer of claim 1, the housing (36) hermetically enclosing the motor pump unit (20) for the hand-held high-pressure washer, the spray gun (38) being connected to the high-pressure water outlet (14).

19. A hand-held high-pressure cleaning machine (35) according to claim 18, characterized in that: the shell (36) is provided with an integrally connected accommodating part (60) and a handheld part (37), the motor pump unit (20) for the handheld high-pressure cleaning machine is arranged in the accommodating part (60), the handheld part (37) extends along the direction inclined away from the accommodating part (60), and the handheld part (37) is provided with a power switch (44).

20. A hand-held high-pressure cleaning machine (35) according to claim 19, characterized in that: the handheld high-pressure cleaning machine (39) further comprises a battery pack (39), and the rated voltage of the battery pack (39) is 18-60V; battery package (39) are located in handheld portion (37) or detachable locate in waterproof storehouse (40) of handheld portion (37) tip, waterproof storehouse (40) are equipped with waterproof cang gai (41), waterproof cang gai (41) pass through sealing strip (42) with waterproof storehouse (40) form sealedly.

21. A hand-held high-pressure cleaning machine (35) according to claim 19, characterized in that: the handheld high-pressure cleaning machine (39) further comprises a battery pack (39), and the rated voltage of the battery pack (39) is 18-60V; the battery pack (39) is connected with the end part of the handheld part (37) in a sealing and plugging mode.

22. A hand-held high-pressure cleaning machine (35) according to any one of claims 18 to 21, characterized in that: the weight of the handheld high-pressure cleaning machine (35) is not more than 4.2kg, and the waterproof grade of the handheld high-pressure cleaning machine is not lower than IPX 7.