Motor pump assembly and cleaning machine

Abstract

The invention provides a motor pump assembly and a cleaning machine, the motor pump assembly comprises a brushless motor, the brushless motor comprises a shell, a stator assembly and a rotor assembly, the stator assembly and the rotor assembly are arranged in the shell, the shell is arranged in a sealed mode, a containing space is formed in the shell, and insulating liquid is contained in the containing space; the pump head assembly is connected with the brushless motor, one end of the pump head assembly is provided with a water inlet pipeline, and the water inlet pipeline is used for providing clean water for the pump head assembly and outputting the clean water after the clean water is pressurized by the pump head assembly; and the driving assembly comprises cooling fins, a first cooling channel is formed between the cooling fins and the shell, and the first cooling channel communicates with the water inlet pipeline. Compared with the prior art, the heat dissipation problem of the brushless motor in the working process can be solved, and the power of the motor pump assembly can be further improved.

Description

Technical Field

[0001] The invention relates to a motor pump component and a cleaning machine, belonging to the technical field of cleaning equipment. Background Art

[0002] Existing water-cooled cleaning machines generally use induction motors, and cover the motor housing with another shell, and design some flow channel partitions and water inlet and outlet interfaces in the annular cavity between the two shells. The motor is cooled by connecting an external water source to the water inlet, and then leading it from the water outlet to the pump inlet through the annular cavity.

[0003] Due to the low efficiency and heavy weight of induction motors, their product performance cannot meet the needs of users, so other motors are needed to meet higher performance requirements.

[0004] The size of brushless motors is generally small, but the solution of making water-cooling channels on the housing of the brushless motor will reduce the contact area between the stator core and the housing. Coupled with the heat insulation effect of the coil, the heat dissipation effect of the coil is not sufficient and the water cooling effect is not good.

[0005] In view of this, it is necessary to propose a new motor pump assembly and a cleaning machine to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a motor pump assembly and a cleaning machine, which can not only improve the heat dissipation effect but also improve the working efficiency.

[0007] To achieve the above object, the present invention provides a motor pump assembly, comprising:

[0008] A brushless motor comprises a housing and a stator assembly and a rotor assembly arranged in the housing, wherein the housing is sealed and an accommodation space is formed in the housing, and an insulating liquid is contained in the accommodation space for absorbing heat generated by the brushless motor and transferring the heat to the outer surface of the housing;

[0009] A pump head assembly is connected to the brushless motor, and a water inlet pipeline is provided at one end of the pump head assembly, and the water inlet pipeline is used to provide clean water to the pump head assembly and output after being pressurized by the pump head assembly;

[0010] The drive assembly comprises a heat sink, a first cooling channel is formed between the heat sink and the shell, and the first cooling channel is communicated with the water inlet pipeline.

[0011] As a further improvement of the present invention, the volume of the insulating liquid accounts for 95% or more of the volume of the accommodating space.

[0012] As a further improvement of the present invention, the brushless motor further comprises an exhaust valve, which is arranged on the housing and communicated with the accommodating space, and a valve port for the exhaust valve is provided on the housing.

[0013] As a further improvement of the present invention, the exhaust valve includes a valve body, a first sealing ring, a second sealing ring, a steel ball and an elastic member. The valve body is embedded in the valve port. The first sealing ring is sleeved on the outside of the valve body to seal the valve body and the outer shell. The steel ball is arranged inside the valve body. The second sealing ring is located between the steel ball and the valve body to seal the internal space of the valve body. The elastic member abuts against the steel ball along the exhaust direction of the exhaust valve.

[0014] As a further improvement of the present invention, the brushless motor also includes a front end cover and a motor shaft, the front end cover is arranged between the housing and the pump head assembly, and the front end cover is sealed and connected to the housing, the motor shaft passes through the front end cover and a rotary oil seal is provided between the motor shaft and the front end cover, a closed cavity is formed between the motor shaft, the rotary oil seal and the front end cover, and a drain hole connected to the closed cavity is opened on the outer wall of the front end cover, and the drain hole extends radially along the motor shaft.

[0015] As a further improvement of the present invention, the water inlet pipeline is parallel to the axial extension direction of the rotor assembly, the first cooling channel has a water inlet and a water outlet, the water outlet of the first cooling channel is connected to the water inlet pipeline, and the water inlet of the first cooling channel is used to receive an external water source.

[0016] As a further improvement of the present invention, the first cooling channel is arranged on the axial side of the shell, and the first cooling channel is arranged in a spiral shape.

[0017] As a further improvement of the present invention, the pump head assembly includes a pump head and a gun shut-off switch, and the pump head is used to receive the clean water flowing in from the water inlet pipeline and increase the pressure.

[0018] As a further improvement of the present invention, the drive assembly further includes a water-cooled driver, and the water-cooled driver is arranged on the heat sink.

[0019] To achieve the above object, the present invention also provides a cleaning machine, including a motor pump assembly, the motor pump assembly includes

[0020] A brushless motor comprises a housing and a stator assembly and a rotor assembly arranged in the housing, wherein the housing is sealed and an accommodation space is formed in the housing, and an insulating liquid is contained in the accommodation space for absorbing heat generated by the brushless motor and transferring the heat to the outer surface of the housing;

[0021] A pump head assembly is connected to the brushless motor, and a water inlet pipeline is provided at one end of the pump head assembly, and the water inlet pipeline is used to provide clean water to the pump head assembly and output after being pressurized by the pump head assembly;

[0022] The drive assembly comprises a heat sink, a first cooling channel is formed between the heat sink and the shell, and the first cooling channel is communicated with the water inlet pipeline.

[0023] The beneficial effects of the present invention are as follows: by arranging insulating liquid in the accommodating space and arranging a first cooling channel between the heat sink and the shell, the insulating liquid can be used to absorb the heat generated by the brushless motor and transfer it to the outer surface of the shell, and then an external water source is introduced into the first cooling channel to take away the heat from the outer surface of the shell, thereby solving the heat dissipation problem of the brushless motor during operation and further improving the power of the motor pump assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the motor pump assembly of the present invention.

[0025] Figure 2 for Figure 1 The schematic diagram of the structure of the motor pump assembly is shown with the drive assembly removed.

[0026] Figure 3 for Figure 1 A cross-sectional view of the motor pump assembly is shown.

[0027] Figure 4 for Figure 1 A cross-sectional view from another perspective of the motor pump assembly is shown.

[0028] Figure 5 for Figure 4 A magnified view of the structure at center.

[0029] Figure 6 for Figure 1 A partial cross-sectional view of the motor pump assembly is shown.

[0030] Figure 7 for Figure 2 Cross-sectional view of the first cooling channel. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] It should be noted here that in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0033] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0034] like Figures 1 to 7 As shown, the present invention discloses a cleaning machine, which includes a motor pump assembly 22. After an external water source is provided to the motor pump assembly 22, the motor pump assembly 22 can pressurize the input water source and output it to perform high-pressure cleaning on the scene to be cleaned. The cleaning machine of the present invention can be applied to the field of household cleaning, and can be used for cleaning courtyards, fences, vehicles, etc., and can also be used in outdoor use scenarios without power supply, such as high-pressure cleaning of tableware after a picnic, docks, ships, yachts, etc.

[0035] like Figure 1 As shown, the motor pump assembly 22 includes a brushless motor 221, a pump head assembly 222 and a drive assembly 24, the brushless motor 221 is arranged between the pump head assembly 222 and the drive assembly 24 and respectively connects the pump head assembly 222 and the drive assembly 24, the pump head assembly 222 is used to receive input from an external water source, the brushless motor 221 is used to provide power to the pump head assembly 222 and to increase the pressure of the pump head assembly 222 by doing work, and the drive assembly 24 is used to drive the brushless motor 221 to work.

[0036] Combination Figure 2 and Figure 3 As shown, specifically, the brushless motor 221 includes a housing 2211, a front end cover 22111, a stator assembly 22112, a rotor assembly 22113 and a motor shaft 22114, wherein the stator assembly 22112, the rotor assembly 22113 and the motor shaft 22114 are all contained inside the housing 2211. The housing 2211 is connected to the drive assembly 24, the front end cover 22111 is connected to the pump head assembly 222, and the housing 2211 and the front end cover 22111 are sealed. The motor shaft 22114 passes through the rotation centers of the housing 2211 and the front end cover 22111 respectively, the stator assembly 22112 is fixedly arranged on the inner wall of the housing 2211, and the rotor assembly 22113 is sleeved on the outer periphery of the motor shaft 22114.

[0037] Preferably, the housing 2211 is sealed, and a containing space is formed between the housing 2211 and the front cover 22111, and the stator assembly 22112, the rotor assembly 22113 and the motor shaft 22114 are all contained in the containing space. An insulating liquid 22115 is also provided in the containing space, and the insulating liquid 22115 is preferably oil, and the volume of the insulating liquid 22115 accounts for 95% or more of the volume of the containing space, so that the insulating liquid 22115 can quickly take away the heat generated by the coil.

[0038] When the motor pump assembly 22 is running, since the coils of the stator assembly 22112 are all immersed in the insulating liquid 22115, the heat generated by the coils can be fully taken away by the insulating liquid 22115. At the same time, the insulating liquid 22115 is in full contact with the motor casing 2211, and the heat of the insulating liquid 22115 is also fully conducted to the surface of the casing 2211. The heat conducted to the casing 2211 is then taken away by the external water source of the first cooling channel 244 that forms a seal with it, thereby effectively reducing the temperature of the coils.

[0039] As a preferred embodiment of the present invention, the motor shaft 22114 is disposed through the front end cover 22111, and a rotary oil seal 22116 is disposed between the motor shaft 22114 and the front end cover 22111. Preferably, two rotary oil seals 22116 are provided, one of which is disposed close to the housing 2211, and the other is disposed close to the pump head assembly 222. A closed cavity is formed between the motor shaft 22114, the rotary oil seal 22116, and the front end cover 22111. A drain hole 22117 communicating with the closed cavity is formed on the outer wall of the front end cover 22111, and the drain hole 22117 extends radially along the motor shaft 22114.

[0040] When the motor pump assembly 22 is running, the lubricating oil in the front oil cylinder of the front cover 22111 may penetrate into the closed cavity, and the insulating liquid 22115 in the accommodating space may also penetrate into the closed cavity. When the oil that penetrates from the front and rear ends cannot be removed in time, the pressure in the closed cavity will increase, causing the oil that enters the closed cavity to enter the accommodating space, causing contamination of the insulating liquid 22115, causing the brushless motor 221 to fail or cause other faults. The setting of the drain hole 22117 can effectively discharge the oil that penetrates into the sealed cavity.

[0041] like Figure 6As shown, a sealing block 22119 is provided on the outer wall of the front end cover 22111, and the wire 22118 of the stator assembly 22112 forms a seal with the sealing block 22119 after passing through the threading hole on the sealing block 22119. The sealing block 22119 also forms a seal with the front end cover 22111, so that the internal space of the brushless motor 221 can be completely sealed.

[0042] For the wire output and sealing method of the brushless motor 221, other structures can also be used. For example: design a plastic junction box, design multiple terminal posts with double-threaded structure inside the junction box, and inject flame-retardant polyurethane potting glue into the junction box to achieve complete sealing on both sides of the junction box; put a sealing ring on the outer periphery of the junction box and mechanically seal it with the outer shell; the wires led out from the coil are connected to the terminal posts with screws on the inside of the junction box; the terminal posts on the outside of the junction box are connected to other structures with connecting wires. This connection method is easy to operate, and the connection and sealing methods are more reliable. Such a design can effectively prevent the insulating liquid 22115 from leaking outward between the core wires of the connecting wires led out from the coil.

[0043] Combination Figure 1 , Figure 4 and Figure 5 As shown, the brushless motor 221 further includes an exhaust valve 2213, which is disposed on the housing 2211 and has a valve port for installing the exhaust valve 2213, and the exhaust valve 2213 is communicated with the accommodating space.

[0044] The exhaust valve 2213 includes a valve body 22131, a first sealing ring 22132, a second sealing ring 22133, a steel ball 22134 and an elastic member 22135. The valve body 22131 is embedded in the valve port. An exhaust hole 22136 is provided on the top of the valve body 22131, and the exhaust hole 22136 is communicated with the outside air. The first sealing ring 22132 is sleeved on the outer side of the valve body 22131 to seal and connect the valve body 22131 and the housing 2211. The steel ball 22134 is arranged inside the valve body 22131, and the second sealing ring 22133 is located between the steel ball 22134 and the valve body 22131 to seal the internal space of the valve body 22131. The elastic member 22135 abuts against the steel ball 22134 along the exhaust direction of the exhaust valve 2213, and the elastic member 22135 is preferably a spring. During exhaust, the gas pushes the steel ball 22134 to move toward the exhaust hole 22136 in the valve body 22131, so that the elastic member 22135 is compressed; after the exhaust is completed, the elastic member 22135 pushes the steel ball 22134 to return to its original position under the action of its own elastic force, thereby closing the exhaust valve 2213.

[0045] More specifically, during the operation of the motor pump assembly 22, the air in the accommodating space expands due to heat, and the air pressure will increase. When the gas pressure reaches the sum of the preload force of the elastic member 22135 and the weight of the steel ball 22134, the pressurized air will push the steel ball 22134 open and overflow from the exhaust hole 22136 on the valve body 22131, thereby reducing the pressure in the accommodating space to ensure sealing safety.

[0046] like Figure 2 , Figure 3 and Figure 7 As shown, the driving assembly 24 includes a heat sink 2411 and a water-cooled driver 241, the side of the brushless motor 221 facing the motor pump assembly 22 is the output end, the other axial end of the brushless motor 221 is the rear end, the heat sink 2411 is fixedly arranged in contact with the housing 2211, and the water-cooled driver 241 is arranged on the heat sink 2411.

[0047] Preferably, a first cooling channel 244 is formed between the heat sink 2411 and the shell 2211, the first cooling channel 244 is arranged on the axial side of the shell 2211, and the first cooling channel 244 is arranged in a spiral shape, the first cooling channel 244 is surrounded to form a planar structure, and the planar structure is perpendicular to the extension direction of the motor shaft 22114, the first cooling channel 244 has a water inlet 2441 and a water outlet 2442, and the water inlet 2441 of the first cooling channel 244 and the water outlet 2442 of the first cooling channel 244 are both arranged along the radial direction of the planar structure.

[0048] Of course, in order to avoid the possible impact of vibration during operation of the motor pump assembly 22 on the water-cooled driver 241, the drive assembly 24 can also be separated from the housing 2211 of the brushless motor 221 and set separately, and the first cooling channel 244 of the housing 2211 and the heat sink 2411 are respectively covered with cover plates to form two independent water channels, and then the two water channels are connected in series by means of connecting pipes to cool the housing 2211 and the heat sink 2411 respectively.

[0049] When the external water source flows in from the water inlet 2441 of the first cooling channel 244, the external water source will fill the first cooling channel 244. It can be understood that, since the first cooling channel 244 is surrounded by the heat sink 2411 and the housing 2211, during the operation of the motor pump assembly 22, the heat generated by the water-cooled driver 241 and the brushless motor 221 is respectively transferred to the heat sink 2411 and the housing 2211, so when the external water source flows through the first cooling channel 244, the heat on the heat sink 2411 and the housing 2211 will continue to be transferred to the water source in the first cooling channel 244, and discharged from the water outlet 2442 of the first cooling channel 244 as the external water source continues to flow, thereby taking away the heat generated by the water-cooled driver 241 and the brushless motor 221 during the operation, which plays a role in heat dissipation. In addition, the water source output from the water outlet 2442 of the first cooling channel 244 can be input into the pump head assembly 222 and reused.

[0050] like Figure 1 As shown, the pump head assembly 222 includes a pump head and a gun shut-off switch 2222 , and the pump head is used to receive clean water flowing in from the water inlet pipe 225 and increase the pressure.

[0051] When the user does not start the cleaning machine, the overflow valve stem (not shown) on the pump head will press against the gun-off shutdown switch 2222 to close it; when the user starts the cleaning machine to work normally, the overflow valve stem is always in a closed state, and when the user stops working and releases the trigger, the overflow valve stem will lose contact with the gun-off shutdown switch 2222 and the power will be cut off and the machine will be shut down.

[0052] A water inlet pipeline 225 is also provided on the outside of the pump head, and the water inlet pipeline 225 is used to provide clean water to the pump head assembly 222 and output it after being pressurized by the pump head assembly 222. Specifically, the water inlet pipeline 225 is parallel to the axial extension direction of the rotor assembly 22113, and the water inlet pipeline 225 is respectively connected to the pump head and the first cooling channel 244, that is, the water inlet of the water inlet pipeline 225 is connected to the water outlet 2442 of the first cooling channel 244, and the water outlet of the water inlet pipeline 225 is connected to the pump head assembly 222.

[0053] In summary, the motor pump assembly 22 of the present invention can produce a better cooling effect by adding insulating liquid 22115 inside the brushless motor 221 to cool the coil and designing a spiral first cooling channel 244 on the outer shell 2211 of the brushless motor 221 to cool the outer shell 2211, so that the brushless motor 221 can output greater power.

[0054] Since the present invention adopts an oil-water co-cooling system to effectively cool the heating elements of the brushless motor 221 and the water-cooled driver 241, the temperature of the brushless motor 221 and the water-cooled driver 241 can be maintained at a relatively low level, so that the performance of the brushless motor 221 and the water-cooled driver 241 can be stably and efficiently exerted, avoiding the problem of performance degradation of the air-cooled motor due to excessive temperature rise, and effectively improving the load output performance of the motor pump.

[0055] In addition, the present invention adopts a water cooling system to solve the heating problem of the motor, so motor blades are no longer required during the design, and the power loss caused by the motor blades is avoided. Therefore, the power of the motor can be further improved, the performance parameters of the motor pump can be increased, and the user experience is improved.

[0056] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A motor pump assembly, characterized in that: include: A brushless motor comprises a housing and a stator assembly and a rotor assembly arranged in the housing, wherein the housing is sealed and an accommodation space is formed in the housing, and an insulating liquid is contained in the accommodation space for absorbing heat generated by the brushless motor and transferring the heat to the outer surface of the housing; A pump head assembly is connected to the brushless motor, and a water inlet pipeline is provided at one end of the pump head assembly, and the water inlet pipeline is used to provide clean water to the pump head assembly and output after being pressurized by the pump head assembly; The drive assembly comprises a heat sink, a first cooling channel is formed between the heat sink and the shell, and the first cooling channel is communicated with the water inlet pipeline.

2. The motor pump assembly according to claim 1, characterized in that: The volume of the insulating liquid accounts for 95% or more of the volume of the accommodating space.

3. The motor pump assembly according to claim 1, characterized in that: The brushless motor further comprises an exhaust valve, which is arranged on the housing and communicated with the accommodating space, and a valve port for the exhaust valve is provided on the housing.

4. The motor pump assembly according to claim 3, characterized in that: The exhaust valve includes a valve body, a first sealing ring, a second sealing ring, a steel ball and an elastic member. The valve body is embedded in the valve port. The first sealing ring is sleeved on the outside of the valve body to seal the valve body and the outer shell. The steel ball is arranged inside the valve body. The second sealing ring is located between the steel ball and the valve body to seal the internal space of the valve body. The elastic member abuts against the steel ball along the exhaust direction of the exhaust valve.

5. The motor pump assembly according to claim 1, characterized in that: The brushless motor also includes a front end cover and a motor shaft, wherein the front end cover is arranged between the housing and the pump head assembly, and the front end cover is sealed and connected to the housing, the motor shaft passes through the front end cover, and a rotating oil seal is provided between the motor shaft and the front end cover, a closed cavity is formed between the motor shaft, the rotating oil seal and the front end cover, and a drain hole connected to the closed cavity is opened on the outer wall of the front end cover, and the drain hole extends radially along the motor shaft.

6. The motor pump assembly according to claim 1, characterized in that: The water inlet pipeline is parallel to the axial extension direction of the rotor assembly. The first cooling channel has a water inlet and a water outlet. The water outlet of the first cooling channel is connected to the water inlet pipeline. The water inlet of the first cooling channel is used to receive external water source.

7. The motor pump assembly according to claim 6, characterized in that: The first cooling channel is arranged on an axial side of the shell, and the first cooling channel is arranged in a spiral shape.

8. The motor pump assembly according to claim 1, characterized in that: The pump head assembly comprises a pump head and a gun-closing and stopping switch, and the pump head is used for receiving clean water flowing in from the water inlet pipeline and increasing the pressure.

9. The motor pump assembly according to claim 1, characterized in that: The drive assembly also includes a water-cooled driver, and the water-cooled driver is arranged on the heat sink.

10. A cleaning machine, characterized in that: A motor pump assembly is included, the motor pump assembly comprising: A brushless motor comprises a housing and a stator assembly and a rotor assembly arranged in the housing, wherein the housing is sealed and an accommodation space is formed in the housing, and an insulating liquid is contained in the accommodation space for absorbing heat generated by the brushless motor and transferring the heat to the outer surface of the housing; A pump head assembly is connected to the brushless motor, and a water inlet pipeline is provided at one end of the pump head assembly, and the water inlet pipeline is used to provide clean water to the pump head assembly and output after being pressurized by the pump head assembly; The drive assembly comprises a heat sink, a first cooling channel is formed between the heat sink and the shell, and the first cooling channel is communicated with the water inlet pipeline.

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