CN106160339A - Motor and the household electrical appliance with this motor - Google Patents

Abstract

The present invention proposes a motor and a household appliance with a modified motor. The motor includes a motor casing, a stator and a rotor are arranged in the motor casing; a motor shaft passes through the rotor and is arranged in the motor casing; a bearing is used for Carrying the shaft of the motor; the heat dissipation fan is sleeved on the shaft of the motor and driven to rotate by the shaft of the motor; the heat dissipation fan includes a first heat dissipation fan and a second heat dissipation fan, and the two are arranged in such a way that when the motor is working, the rotation of the first heat dissipation fan drives The air flows parallel to the axial direction of the motor shaft along the first circulation space formed by the stator and the motor casing, and the second cooling fan rotates to drive the air along the second circulation space formed by the stator and the rotor The axial flow is parallel to the motor shaft; the direction of the axial flow driven by the first heat dissipation fan and the second heat dissipation fan is opposite. In this way, the heat inside the motor is transferred to the motor casing and dissipated to the outside of the motor, achieving a good effect of reducing the internal temperature of the motor.

Description

Motor and household appliances with the same

technical field

The invention relates to a motor, in particular to a cooling fan of the motor.

The invention also relates to a domestic appliance, in particular a cooker hood, a dishwasher or a washing machine, having an electric motor as described above.

Background technique

The main structure of a general motor is a motor casing, a stator and a rotor arranged in the motor casing. The rotating shaft driven by the motor passes through the rotor, is carried by the bearing and installed in the motor housing. When the motor is running, losses are generated due to the alternating electromagnetic field inside the machine or air friction, and these losses are converted into heat, resulting in an increase in the temperature inside the motor casing. In order to ensure the normal operation of the motor within the specified temperature limit, certain measures must be taken during the design of the motor to try to dissipate the heat to the outside of the motor and dissipate it, such as water cooling or full air cooling. The full air-cooling method is to use the function of the rotation of the motor, and add some flow guide components to the structure, such as a cooling fan, so that the air inside the motor casing flows in the motor casing according to the specified path, and the heat generated in the motor casing is continuously dissipated. Conducted to the outside of the motor housing. Concrete motor structure can refer to the Chinese utility model patent that publication number is CN2694602Y, and its tool motor housing is provided with air inlet and exhaust port. However, how to dissipate heat more effectively is a problem that needs to be solved for a motor whose housing is a closed type.

Contents of the invention

The purpose of the present invention is to provide a motor with an improved structure, thereby effectively improving the heat dissipation performance of the motor.

In order to achieve the above object, the present invention proposes a motor, including a motor casing, a stator and a rotor are arranged in the motor casing; a motor shaft passes through the rotor and is arranged in the motor casing; a bearing, Used to carry the motor shaft; the heat dissipation fan is sleeved on the motor shaft and driven to rotate by the motor shaft, agitating the air flow inside the motor casing; the heat dissipation fan includes a first heat dissipation fan and a second heat dissipation fan , and the first heat dissipation fan and the second heat dissipation fan are arranged in such a way that when the motor is working, the rotation of the first heat dissipation fan drives the air parallel to the motor along the first circulation space formed by the stator and the motor casing. The rotating shaft flows axially, and the rotation of the second heat dissipation fan drives the air to flow along the second circulation space formed by the stator and the rotor parallel to the axial direction of the motor shaft; the first heat dissipation fan and the second heat dissipation fan drive Air flows axially in the opposite direction.

The so-called first circulation space refers to the first axial space including the space between the inner ring surface of the stator close to the rotor and the motor casing.

The so-called second circulation space refers to the second axial space including the space between the stator inner ring surface close to the rotor and the rotor inner ring surface close to the rotating shaft.

When the motor is working, its central part, namely the second circulation space, has the highest temperature, especially the rotor magnetic pole display and the stator core. In the closed structure of the motor casing, two cooling fans that drive the axial flow of air in the opposite direction are set, so that The air in the motor casing circulates between the first circulation space and the second circulation space, so that the heat in the central part of the motor is brought to the first circulation space by the circulating gas and dissipated to the outside of the motor through the motor casing. In order to prevent the internal temperature of the motor from being too high and affecting the normal performance of the motor.

As a further improvement of the present invention, the second circulation space surrounds and is close to the motor shaft, and the first circulation space surrounds the second circulation space and is away from the motor shaft.

As a further improvement of the present invention, the blades of the first heat dissipation fan are radially extended in the first circulation space, and the blades of the second heat dissipation fan are radially extended in the second circulation space.

The blades of the first cooling fan are only arranged radially in the first circulation space to better encourage the air in the first circulation space to flow axially. Similarly, the blades of the second cooling fan are only radially arranged in the second circulation space. The axial flow of air in the second circulation space is better encouraged. In this way, the circulation of air between the first and second circulation spaces can be better promoted.

As a further improvement of the present invention, the blades of the first cooling fan are arranged on the outer periphery of the second cooling fan.

The first heat dissipation fan and the second heat dissipation fan are integrally formed, which can greatly reduce the volume for accommodating the first and second heat dissipation fans, thereby reducing the volume of the motor and saving material costs.

As a further improvement of the present invention, the first and second cooling fans are both axial flow fans.

As a further improvement of the present invention, the first and second cooling fans are installed on the same axial side of the motor rotor.

As a further improvement of the present invention, the first and second cooling fans are respectively installed on both axial sides of the motor rotor.

In addition, the present invention also proposes a household appliance with the motor described in any one of the above items.

General household appliances all need motors as their important parts, such as washing machines, dishwashers, range hoods, vacuum cleaners or refrigerators, etc. The specific structures of similar household appliances are familiar to those skilled in the art, and will not To repeat it again, however, the motor as its component parts can adopt any one of the above-mentioned motor structure schemes to better exert the performance of the motor.

Next, the present invention will be described in detail by taking the household appliance implemented as a dishwasher as a preferred embodiment. But this does not mean that the protection scope of the present invention is only limited to the dishwasher.

Description of drawings

Fig. 1 is a schematic structural view of a household dishwasher in a preferred embodiment of the present invention;

Fig. 2 is the longitudinal plan figure of motor in the preferred embodiment of the present invention;

Fig. 3 is the structural representation of motor cooling fan in the preferred embodiment of the present invention;

Reference signs: 100-motor; 1-motor casing; 2-motor shaft; 4-stator; 5-rotor; 6-bearing; 7-cooling fan; 71-first cooling fan; 711-first cooling fan blade ; 72-the second cooling fan; 721-the second cooling fan blade; 722-the outer periphery of the second cooling fan; A-the first circulation space; B-the second circulation space; GS-dishwasher; BO-bottom assembly; IR-inner space; GK-cutlery basket; SA-spray arm; PS-pump pool; WZ-water heating system; UP-circulation pump; LP-discharge liquid pump; EL-water discharge line; ZL-supply line .

detailed description

The dishwasher GS shown in Figure 1 comprises an interior IR serving as a washing container, which can be opened and closed by means of a door (not shown) which can be pivotally connected to the dishwasher GS for Loading and unloading purposes. A cutlery basket GK for receiving items to be cleaned is provided in the interior space IR of the dishwasher GS, and the items to be cleaned are removable from the interior space IR of the dishwasher GS for loading and unloading.

In order to clean the items to be cleaned stored in the cutlery basket GK, a spray device embodied as a spray arm SA for applying a fluid to the items to be cleaned is arranged in the interior IR of the dishwasher GS, wherein the fluid It can be water to which, for example, a cleaning agent or a rinse base has been applied, in order thereby to achieve a cleaning action and/or a spot-free drying of the items to be cleaned. Fluid dripping from the items to be cleaned collects in a pump sump PS which is arranged in the bottom region of the interior IR of the dishwasher GS. A filter device (not shown) is also provided in the pump sump PS, by means of which dirt or particles can be separated from the circulating fluid.

The spray arm SA is fluidically connected by means of a supply line ZL to a circulation pump UP which is arranged adjacent to other dishwasher components in the base unit BO below the interior IR of the dishwasher GS. During operation, ie while the circulation pump UP is running, the circulation pump UP sucks in the fluid collected in the pump sump PS and delivers it to the spray arm SA via the supply line ZL. In this exemplary embodiment, in order to heat the fluid passing through the circulation pump UP, the circulation pump UP comprises an integrated water heating system WZ for heating the fluid. Optionally, a separate continuous water heater or other water heating system can also be provided to heat the fluid. Furthermore, a liquid discharge pump LP is provided in the dishwasher GS for the liquid discharge of the interior space IR of the dishwasher GS, which liquid discharge pump LP can be fluidically connected to the pump sump PS and possibly also to the To the water discharge line EL in the domestic wastewater discharge network.

Both the discharge liquid pump LP and the circulation pump UP of the above-mentioned dishwasher GS can be provided with the motor of the present invention, which is used to discharge the water in the dishwasher and circulate the water or air in the dishwasher.

As shown in FIG. 2 , the motor 100 has a motor housing 1 in which a rotor 5 and a stator 4 surrounding the rotor 5 are arranged. A motor shaft 2 passes through the rotor 5 , and the front and rear ends of the motor shaft 2 inside the motor housing 1 are respectively carried by bearings 6 and arranged in the motor housing 1 . The rotor 5 rotates under the drive of the motor 100 , and then drives the motor shaft 2 to rotate to realize the corresponding functions of the motor 100 in different functional modules. A cooling fan 7 is provided at the front end inside the motor housing 1 , which is sheathed on the motor shaft 2 between the bearing 6 and the rotor 5 . When the motor is working, the heat dissipation fan 7 rotates inside the motor housing 1 under the rotation of the motor shaft 2 to agitate the air flow inside the motor housing 1 . The interior of the motor casing 1 includes a first circulation space A constructed by the stator 4 and the motor casing 1 and a second circulation space B constructed by the stator 4 and the rotor 5. The first circulation space A specifically refers to The first axial space includes the space between the inner ring surface of the stator 4 close to the rotor 5 and the space between the motor casing 1, and the second flow space B specifically refers to the space between the inner ring surface of the stator 4 close to the rotor 5 and the space close to the rotating shaft 2. The second axial space is the space between the inner ring surfaces of the rotor 5 . The second circulation space B surrounds and is close to the motor shaft 2 , and the first circulation space A surrounds the second circulation space B and is away from the motor shaft 2 . The first circulation space A and the second circulation space B communicate with each other, and the air inside the motor housing 1 can circulate between the first circulation space A and the second circulation space B under the rotation and agitation of the cooling fan 7 .

The heat dissipation fan 7 includes a first heat dissipation fan 71 and a second heat dissipation fan 72, and the first heat dissipation fan 71 and the second heat dissipation fan 72 are arranged in such a way that when the motor works, the first heat dissipation fan 71 rotates to drive the air along the first flow path. The space A flows axially parallel to the motor shaft 2, and the rotation of the second cooling fan 72 drives the air to flow along the second circulation space B parallel to the axial direction of the motor shaft 2; the first cooling fan 71 and the second cooling fan 72 drive the air axially The direction of flow is opposite, so that the air can circulate between the first circulation space A and the second circulation space B.

When the motor is working, its central part, that is, the second circulation space B has the highest temperature, especially the temperature of the magnetic pole surface of the rotor 5 and the iron core of the stator 4 is relatively high. In the closed structure of the motor case 1, the first cooling fan 71 and the second cooling fan 72 that drive the axial flow direction of the air in the opposite direction are arranged so that the air in the motor case 1 can flow through the first circulation space A and the second circulation space A. The space B is circulated, so that the heat in the center of the motor, that is, the second circulation space B is brought to the first circulation space A by the circulating gas and dissipated to the outside of the motor through the motor casing 1, thereby preventing the internal temperature of the motor from being too high. High and affect the normal performance of the motor.

As shown in FIG. 3 , the first cooling fan 71 and the second cooling fan 72 are integrally formed, and the first cooling fan blades 711 are arranged on the outer periphery 722 of the second cooling fan 72, so that the accommodation of the first cooling fan 72 can be greatly reduced. Second, the volume of the heat dissipation fan can reduce the volume of the motor and save the material cost. The first heat dissipation fan blade 711 is radially extended in the first circulation space A, and the second heat dissipation fan blade 721 is radially extended in the second circulation space B. The first cooling fan blades 711 are only radially arranged in the first circulation space A, which can better encourage the air in the first circulation space A to flow axially. Similarly, the second cooling fan blades 721 are only radially arranged in the second circulation space. B can better encourage the axial flow of air in the second circulation space B, which can better promote the circulation of air between the first and second circulation spaces, thereby transferring the heat inside the motor to the motor casing and dissipating it. To the outside of the motor, to achieve a good effect of reducing the internal temperature of the motor.

In this embodiment, both the first cooling fan 71 and the second cooling fan 72 are axial flow fans, and they are installed on the same axial side of the motor rotor 5, that is, on the front axial side of the rotor 5. Of course, in another In an embodiment, the first cooling fan 71 and the second cooling fan 72 may also be installed on the rear axial side of the rotor 5 .

In this embodiment, the first heat dissipation fan 71 and the second heat dissipation fan 72 are integrally formed, but those skilled in the art can easily imagine that in another embodiment, the first heat dissipation fan 71 and the second heat dissipation fan 72 can be set independently And separately installed on the motor rotating shaft 2, and can be respectively installed on the front and rear axial sides of the rotor 5.

The series of detailed descriptions listed above are only specific descriptions for feasible implementation modes of the present invention, and they are not intended to limit the protection scope of the present invention. Therefore, all equivalent implementations or changes made without departing from the technical spirit of the present invention shall be included in the protection scope of the present invention.

Claims (9)

1. A motor, comprising a motor casing (1), A stator (4) and a rotor (5) are arranged in the motor housing (1); a motor shaft (2), which passes through the rotor (5) and is arranged in the motor housing (1); A bearing (6), used to carry the motor shaft (2); The cooling fan (7) is sleeved on the motor shaft (2) and driven to rotate by the motor shaft (2), agitating the air flow inside the motor housing (1); It is characterized in that the cooling fan (7) includes a first cooling fan (71) and a second cooling fan (72), and the first cooling fan (71) and the second cooling fan (72) are arranged in such a way that the motor When working, the first cooling fan (71) rotates to drive the air along the first circulation space (A) formed by the stator (4) and the motor casing (1) and is parallel to the axis of the motor shaft (2). The second cooling fan (72) rotates to drive the air to flow along the second circulation space (B) formed by the stator (4) and rotor (5) parallel to the axial direction of the motor shaft (2) ; The directions in which the first cooling fan (71) and the second cooling fan (72) drive the axial flow of air are opposite. 2. The motor according to claim 1, characterized in that, the second circulation space (B) surrounds and is close to the motor shaft (2), and the first circulation space (A) surrounds the second circulation space (B) , and away from the motor shaft (2). 3. The motor according to claim 1 or 2, characterized in that, the first cooling fan blade (711) extends radially in the first circulation space (A), and the second cooling fan blade ( 721) is radially extended and arranged in the second circulation space (B). 4. The motor according to claim 1 or 2, characterized in that, the first cooling fan blades (711) are arranged on the outer periphery (722) of the second cooling fan (72). 5. The motor according to claim 1 or 2, characterized in that, the first and second cooling fans (71, 72) are both axial flow fans. 6. The motor according to claim 1 or 2, characterized in that, the first and second cooling fans (71, 72) are installed on the same axial side of the motor rotor (5). 7. The motor according to claim 1 or 2, characterized in that, the first and second cooling fans (71, 72) are installed on both axial sides of the rotor (5) of the motor respectively. 8. A household appliance, characterized by comprising the motor (100) described in any one of the above items. 9. The household appliance according to claim 8, characterized in that the household appliance comprises a range hood, a dishwasher or a washing machine.