A DC brushless motor heat dissipation device for vacuum cleaner

Abstract

The present invention relates to the field of brushless DC motors, and in particular to a brushless DC motor heat dissipation device for a vacuum cleaner. The device includes a bottom shell, an upper cover shell, an air outlet filter, a suction nozzle, etc.; the top of the bottom shell is clamped with an upper cover shell, the top of the upper cover shell is fixedly connected to an air outlet filter, and one side of the bottom shell is fixedly connected to a suction nozzle. The output shaft of the brushless DC motor of the present invention drives the rotating impeller assembly to rotate, and the vacuum cleaner sucks air, dust and debris into a sealed bag through the suction nozzle, filters through multiple layers of filter columns and leaves dust and debris in the sealed bag, and the air in the sealed bag is quickly drawn into the motor support ring to form an airflow, which blows away the heat on the surface of the brushless DC motor and discharges it from the air outlet filter.

Description

Technical Field

[0001] The invention relates to the field of brushless DC motors, and in particular to a brushless DC motor heat dissipation device for a vacuum cleaner. Background Art

[0002] A vacuum cleaner usually refers to a vacuum cleaner, which is a device that uses gas to create a partial vacuum, generate suction and suck up dust from the floor or other locations. The function of a vacuum cleaner is to suck up dust and small dry objects such as paper scraps, hair, and dust. Vacuum cleaners are generally driven by a brushless DC motor, which consists of a motor body and a driver. It is a common type of motor on the market.

[0003] Nowadays, most vacuum cleaners use the high-speed operation of the motor to suck in external air, dust and debris from the suction port. The dust will remain in the filter, and the filtered air will enter the motor to dissipate the heat of the motor. When the airflow passes through the vacuum cleaner, a large space will be reserved at the motor installation location, so that the gas circulation is buffered and the gas flow rate decreases, which will reduce the heat dissipation efficiency of the motor. If there is too much dust and debris in the room, the debris will stick to the filter under the suction, the filter will be blocked, and the air circulation will be reduced, making it impossible for the motor to fully dissipate heat, resulting in heat accumulation inside the motor, reducing the working efficiency and life of the DC brushless motor.

[0004] Therefore, we urgently need to develop a DC brushless motor heat dissipation device for a vacuum cleaner, which can dissipate heat for the DC brushless motor more quickly and fully, and improve the heat dissipation efficiency of the DC brushless motor. Summary of the invention

[0005] In order to overcome the above shortcomings, the present invention provides a DC brushless motor heat dissipation device for a vacuum cleaner, which can dissipate heat for the DC brushless motor more quickly and fully, thereby improving the heat dissipation efficiency of the DC brushless motor.

[0006] A brushless DC motor heat dissipation device for a vacuum cleaner comprises a bottom shell, an upper cover shell, an air outlet filter, a suction nozzle, a sealing bag, an exhaust mechanism and a flow guiding mechanism, wherein the top of the bottom shell is clamped with the upper cover shell, the top of the upper cover shell is fixedly connected with the air outlet filter, one side of the bottom shell is fixedly connected with the suction nozzle, a sealing bag is placed on the upper inner side of the bottom shell, the suction nozzle is connected to the sealing bag through the bottom shell, the sealing bag is provided with an exhaust mechanism, and the exhaust mechanism is provided with a flow guiding mechanism.

[0007] Optionally, the exhaust mechanism includes a partition plate, a motor support ring, a DC brushless motor, a rotating impeller group, a sealing ring and a multi-layer filter column. The partition plate is placed on the sealing bag, and the partition plate is in contact with the bottom end of the upper cover shell. The top of the partition plate is fixedly connected to the motor support ring, the inner side of the motor support ring is fixedly connected to the DC brushless motor, the output shaft of the DC brushless motor is fixedly connected to the rotating impeller group, the inner side of the partition plate is fixedly connected to the sealing ring, the rotating impeller group is located in the sealing ring, the bottom of the partition plate is fixedly connected to the multi-layer filter column, and the multi-layer filter column is located in the sealing bag.

[0008] Optionally, the sealing ring is a hollow structure.

[0009] Optionally, the flow guide mechanism includes a sliding ring, a compression spring, a connecting pipe and a speed regulating valve. Two sliding rings are slidingly connected to the partition plate, and long through holes are provided on the two sliding rings. Two compression springs are connected between each sliding ring and the partition plate. Two connecting pipes are slidingly connected to the motor support ring, and the long through holes of the two sliding rings are connected to one end of the connecting pipe, and the other ends of the two connecting pipes are connected to the speed regulating valve.

[0010] Optionally, a moving mechanism is also included, and the exhaust mechanism is provided with a moving mechanism, and the moving mechanism includes an inclined push rod, a pushing block, an arc plate, a connector, and a small spring. The upper parts of the two connecting tubes are fixedly connected with the inclined push rods, and the upper part of the motor support ring is slidably connected with two pushing blocks, and the pushing blocks are slidably connected to the inclined push rods. The two pushing blocks are fixedly connected with arc plates, and the ends of the two connecting tubes away from the sliding rings are connected with connectors, and the two connectors are also slidably connected with arc plates, and the motor support ring is slidably connected to the four arc plates, and two small springs are respectively connected between the two arc plates and the connectors.

[0011] Optionally, both of the two inclined push rods are provided with inclined grooves.

[0012] Optionally, the arc plate is an arc-shaped structure.

[0013] Optionally, a stirring mechanism is also included. The motor support ring is provided with a stirring mechanism, and the stirring mechanism includes a sliding rod, a fixed long rod, rotating blades and a long spring. Four sliding rods are slidably connected to the motor support ring, each of the sliding rods is fixedly connected to two fixed long rods, each of the fixed long rods is rotatably connected to a number of rotating blades, and a long spring is connected between the arc plate and the sliding rod.

[0014] Optionally, a main guide plate and a secondary guide plate are also included, wherein the top ends of the two arc plates are fixedly connected to the two main guide plates, the two main guide plates are provided with through holes, the through holes of the main guide plates are located above the connector, and the top ends of the other two arc plates are fixedly connected to the secondary guide plates.

[0015] Optionally, a heat sink is also included, and a plurality of heat sinks are fixedly connected to the outside of the brushless DC motor.

[0016] Beneficial effects:

[0017] 1. When the vacuum cleaner is started, it will drive the brushless DC motor to start, causing the impeller group to rotate, and the air, dust and debris near the ground will be sucked into the sealed bag through the suction nozzle. The multi-layer filter column will filter out the dust and debris in the sealed bag, leaving the dust and debris in the sealed bag, and quickly draw the air in the sealed bag into the motor support ring, forming an airflow in the motor support ring to blow away the heat on the surface of the brushless DC motor, thereby dissipating the heat of the brushless DC motor.

[0018] 2. When the vacuum cleaner sucks in larger debris, the debris blocks a part of the multi-layer filter column, making it impossible for the DC brushless motor to dissipate heat normally. At this time, the two sliding rings move, so that the long through holes of the two sliding rings are connected to the inside of the motor support ring, allowing the rotating impeller group to draw in air through the sealing bag and the two sliding rings, and then further dissipate the heat for the DC brushless motor by increasing the air intake channel, so that the blocked vacuum cleaner can still ensure the heat dissipation efficiency, avoiding the DC brushless motor from accumulating heat due to the multi-layer filter column being blocked by debris. At the same time, the pressure in the sealing bag will be restored, so that the debris will no longer block the multi-layer filter column, and the multi-layer filter column will resume normal ventilation, thereby avoiding the multi-layer filter column being blocked by debris, and allowing the DC brushless motor to fully dissipate heat, thereby improving the heat dissipation efficiency of the DC brushless motor.

[0019] 3. When the vacuum cleaner sucks in too much large debris, more parts of the multi-layer filter column are blocked, and the movement of the two connecting pipes will drive the four arc plates to move closer to each other and contact each other. The air in the sealed bag will be quickly drawn into the cylinder surrounded by the four arc plates, which will speed up the gas circulation in the cylinder. This will allow the air to take away the heat from the surface of the brushless DC motor more quickly, thereby dissipating the heat of the brushless DC motor more quickly, reducing the internal heat accumulation of the brushless DC motor and extending the working efficiency and life of the vacuum cleaner.

[0020] 4. The air circulating in the motor support ring will drive several rotating blades to rotate. The rotation of several rotating blades will stir the air around the DC brushless motor, mix the air with higher temperature with the air with lower temperature, and then reduce the air temperature around the DC brushless motor, so as to reduce the temperature of the hot air more quickly, so that the DC brushless motor can further dissipate heat more effectively, reduce the internal heat accumulation of the DC brushless motor, and extend the working efficiency and life of the DC brushless motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 It is a schematic diagram of a first partial cross-sectional three-dimensional structure of the exhaust mechanism, the flow guiding mechanism and the moving mechanism of the present invention.

[0023] Figure 3 It is a schematic diagram of a partially cutaway three-dimensional structure of the exhaust mechanism of the present invention.

[0024] Figure 4 It is a schematic diagram of the partial three-dimensional structure of the exhaust mechanism of the present invention.

[0025] Figure 5 It is a partial three-dimensional structural schematic diagram of the air exhaust mechanism and the flow guide mechanism of the present invention.

[0026] Figure 6 It is a partial cross-sectional three-dimensional structural schematic diagram of the exhaust mechanism and the flow guide mechanism of the present invention.

[0027] Figure 7 It is a schematic diagram of the partially disassembled three-dimensional structure of the exhaust mechanism and the flow guide mechanism of the present invention.

[0028] Figure 8 It is a partial three-dimensional structural schematic diagram of the exhaust mechanism, the flow guiding mechanism and the moving mechanism of the present invention.

[0029] Fig. 9 It is a second partial cross-sectional three-dimensional structural schematic diagram of the exhaust mechanism, the flow guiding mechanism and the moving mechanism of the present invention.

[0030] Fig.10 It is a schematic diagram of a partially disassembled three-dimensional structure of the moving mechanism of the present invention.

[0031] Fig.11 It is a schematic diagram of the partial three-dimensional structure of the moving mechanism and the stirring mechanism of the present invention.

[0032] Fig.12 It is a partial cross-sectional three-dimensional structural schematic diagram of the moving mechanism and the stirring mechanism of the present invention.

[0033] Fig.13It is a schematic diagram of the split three-dimensional structure of the arc plate, connector, main guide plate and auxiliary guide plate of the present invention.

[0034] Fig.14 It is a three-dimensional structural schematic diagram of the arc plate, the main guide plate and the auxiliary guide plate of the present invention.

[0035] Fig.15 It is a schematic diagram of the cross-sectional three-dimensional structure of the arc plate, the connector and the main guide plate of the present invention.

[0036] The meanings of the reference numerals in the figure are as follows: 1: bottom shell, 2: upper cover shell, 3: air outlet filter, 4: suction nozzle, 5: sealing bag, 61: partition plate, 62: motor support ring, 63: DC brushless motor, 64: rotating impeller group, 65: sealing ring, 66: multi-layer filter column, 71: sliding ring, 72: compression spring, 73: connecting pipe, 74: speed control valve, 81: inclined push rod, 82: pushing block, 83: arc plate, 84: connector, 85: small spring, 91: sliding rod, 92: fixed long rod, 93: rotating blade, 94: long spring, 101: main guide plate, 102: auxiliary guide plate, 11: heat dissipation plate. DETAILED DESCRIPTION

[0037] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, and bonding in the prior art, which will not be described in detail here.

[0038] Example 1

[0039] A brushless DC motor heat dissipation device for a vacuum cleaner, such as Figure 1-Figure 10 As shown, it includes a bottom shell 1, an upper cover shell 2, an air outlet filter 3, a suction nozzle 4, a sealing bag 5, an exhaust mechanism and a flow guide mechanism. The upper cover shell 2 is clamped on the top of the bottom shell 1, and the air outlet filter 3 is connected to the top of the upper cover shell 2 by bolts. A suction nozzle 4 is connected to one side of the bottom shell 1 by bolts. A sealing bag 5 is placed on the upper inner side of the bottom shell 1, and the suction nozzle 4 is connected to the sealing bag 5 through the bottom shell 1. An exhaust mechanism is provided on the sealing bag 5, and a flow guide mechanism is provided on the exhaust mechanism.

[0040] The exhaust mechanism includes a partition plate 61, a motor support ring 62, a DC brushless motor 63, a rotating impeller group 64, a sealing ring 65 and a multi-layer filter column 66. The partition plate 61 is placed on the sealing bag 5, and the partition plate 61 is in contact with the bottom end of the upper cover shell 2. The top of the partition plate 61 is connected to the motor support ring 62 by rivets, and the inner side of the motor support ring 62 is connected to the DC brushless motor 63 by bolts. The output shaft of the DC brushless motor 63 is connected to the rotating impeller group 64 by rivets. The inner side of the partition plate 61 is connected to the sealing ring 65 by bolts, and the rotating impeller group 64 is located in the sealing ring 65. The bottom of the partition plate 61 is connected to the multi-layer filter column 66 by bolts, and the multi-layer filter column 66 is located in the sealing bag 5.

[0041] The sealing ring 65 is a hollow structure.

[0042] The flow guide mechanism includes a sliding ring 71, a compression spring 72, a connecting pipe 73 and a speed regulating valve 74. Two sliding rings 71 are slidably connected to the partition plate 61. Long through holes are provided on the two sliding rings 71. Two compression springs 72 are connected to each of the sliding rings 71 and the partition plate 61 through hooks. Two connecting pipes 73 are slidably connected to the motor support ring 62. The long through holes of the two sliding rings 71 are connected to one end of the connecting pipe 73. The other ends of the two connecting pipes 73 are connected to the speed regulating valve 74.

[0043] Initially, the partition plate 61 blocks the long through holes of the two sliding rings 71. When the user starts the vacuum cleaner, the start of the vacuum cleaner will drive the DC brushless motor 63 to start. The rotation of the output shaft of the DC brushless motor 63 will drive the rotating impeller group 64 to rotate. The rotating impeller group 64 will suck the air, dust and debris near the ground into the sealing bag 5 through the suction nozzle 4. The multi-layer filter column 66 will filter out the dust and debris in the sealing bag 5, leaving the dust and debris in the sealing bag 5. The rotation of the rotating impeller group 64 will suck the air, dust and debris near the ground into the sealing bag 5 through the suction nozzle 4. The air is quickly drawn into the motor support ring 62, and an airflow is formed in the motor support ring 62 to blow away the heat on the surface of the DC brushless motor 63 and discharge it from the air outlet filter 3. If the vacuum cleaner sucks in larger debris, the debris will cling to the multi-layer filter column 66 under the suction of the rotating impeller group 64. When a part of the multi-layer filter column 66 is blocked, the air flow area of ​​the multi-layer filter column 66 will be reduced, making the negative pressure in the sealing bag 5 too large. The two sliding rings 71 will move towards each other under the action of pressure, and the two pressure The compression spring 72 is compressed, and the partition plate 61 will no longer block the long through holes of the two sliding rings 71. The movement of the two sliding rings 71 will drive the two connecting pipes 73 to move in a direction close to each other. The movement of the two connecting pipes 73 will drive the two speed regulating valves 74 to move in a direction close to each other. The two speed regulating valves 74 will adjust the flow rate of the gas, so that the air flows into the motor support ring 62 through the speed regulating valves 74, the connecting pipes 73 and the sliding rings 71, dissipating the heat of the DC brushless motor 63 and restoring the pressure in the sealing bag 5. When the debris clinging to the multi-layer filter column 66 falls into the sealing bag 5, the multi-layer filter column 66 will be ventilated normally, and the DC brushless motor 63 can be ventilated and dissipated normally, while preventing the debris from blocking the multi-layer filter column 66, so that the vacuum cleaner can restore normal suction and ensure normal vacuuming effect. When the negative pressure inside the sealing bag 5 returns to its initial state, the reset of the compression spring 72 will drive the reset of the sliding ring 71, the reset of the sliding ring 71 will drive the reset of the connecting pipe 73, and the reset of the connecting pipe 73 will drive the reset of the speed regulating valve 74.

[0044] Example 2

[0045] On the basis of Example 1, Figure 2-Figure 15As shown, a moving mechanism is also included. The exhaust mechanism is provided with a moving mechanism, and the moving mechanism includes an inclined push rod 81, a pushing block 82, an arc plate 83, a connector 84, and a small spring 85. The upper parts of the two connecting pipes 73 are connected to the inclined push rod 81 by bolts, and the upper part of the motor support ring 62 is slidably connected to two pushing blocks 82, and the pushing blocks 82 are slidably connected to the inclined push rod 81. The two pushing blocks 82 are connected to the arc plate 83 by rivets, and the ends of the two connecting pipes 73 away from the sliding ring 71 are connected to the connector 84, and the two connectors 84 are also slidably connected to the arc plate 83. The motor support ring 62 is slidably connected to the four arc plates 83, and two small springs 85 are connected to the two arc plates 83 and the connector 84 respectively through hooks.

[0046] The two inclined push rods 81 are both provided with inclined grooves.

[0047] The arc plate 83 is an arc-shaped structure.

[0048] When the vacuum cleaner sucks in too much large debris, more parts of the multi-layer filter column 66 will be blocked by the debris, and the two connecting tubes 73 will drive the two inclined push rods 81 to move in a direction close to each other, and the movement of the two inclined push rods 81 will drive the two push blocks 82 to move in a direction close to each other through the inclined groove, and the movement of the two push blocks 82 will drive two of the arc plates 83 to move in a direction close to each other, and the movement of the two connecting tubes 73 will drive the two connectors 84 to move in a direction close to each other, and the movement of the two connectors 84 will drive the other two arc plates 83 to move in a direction close to each other through the small spring 85, so that the four arc plates 83 move in a direction close to each other and contact, and then the four arc plates 83 stop moving and form a cylinder, and the air in the sealing bag 5 will be quickly drawn into the cylinder composed of the four arc plates 83. The amount is the same, and the cylinder composed of four arc plates 83 reduces the flow diameter of the airflow, so that the gas circulation speed in the cylinder composed of four arc plates 83 is accelerated, so that the heat on the surface of the DC brushless motor 63 can be taken away more quickly, the DC brushless motor 63 can be cooled more quickly, the internal heat accumulation of the DC brushless motor 63 can be reduced, and the working efficiency and life of the vacuum cleaner can be extended. When the debris no longer blocks the multi-layer filter column 66, the negative pressure inside the sealing bag 5 returns to its initial state, and the reset of the connecting pipe 73 will drive the reset of the inclined push rod 81, and the reset of the inclined push rod 81 will drive the reset of the push block 82, and the reset of the push block 82 will drive the reset of two of the arc plates 83, and the reset of the connecting pipe 73 will also drive the reset of the speed regulating valve 74, and the reset of the small spring 85 will drive the reset of the other two arc plates 83, so that the rotating impeller group 64 will draw air into the motor support ring 62 again to continue to dissipate heat from the DC brushless motor 63.

[0049] Example 3

[0050] On the basis of Example 2, Figure 6-Figure 12 As shown, a stirring mechanism is also included. The motor support ring 62 is provided with a stirring mechanism, and the stirring mechanism includes a sliding rod 91, a fixed long rod 92, a rotating blade 93 and a long spring 94. Four sliding rods 91 are slidably connected to the motor support ring 62, and each of the sliding rods 91 is connected to two fixed long rods 92 by bolts. Each of the fixed long rods 92 is rotatably connected to a plurality of rotating blades 93, and a long spring 94 is connected between the arc plate 83 and the sliding rod 91 by a hook.

[0051] The air circulating in the motor support ring 62 will drive the plurality of rotating blades 93 to rotate. Since the temperature of the air near the motor support ring 62 is slightly lower than the temperature of the air near the DC brushless motor 63, the plurality of rotating blades 93 can stir the relatively low-temperature air near the motor support ring 62 to the vicinity of the DC brushless motor 63, so that the relatively low-temperature air contacts the hot air, thereby reducing the temperature of the hot air, and allowing the circulating air to take away more heat from the surface of the DC brushless motor 63, thereby dissipating the heat of the DC brushless motor 63 more effectively. When the negative pressure in the sealing bag 5 is too large, the four arc plates 83 move and contact in a direction approaching each other, so that the four sliding rods 91 move in a direction approaching each other under the elastic force of the long springs 94. Each movement of the sliding rod 91 will drive the two fixed long rods 92 to move. If the four sliding rods 91 continue to move, they will be blocked by the motor support ring 62, causing the four sliding rods 91 to stop moving. The four long springs 94 are compressed, and each fixed long rod The movement of 92 will drive the movement of several rotating blades 93. The air circulating in the cylinder composed of four arc plates 83 will drive the several rotating blades 93 to rotate more quickly, and stir the air near the motor support ring 62 to the vicinity of the DC brushless motor 63 more quickly, thereby reducing the temperature of the hot air more quickly, allowing the DC brushless motor 63 to further dissipate heat more effectively, reduce the internal heat accumulation of the DC brushless motor 63, extend the working efficiency and life of the DC brushless motor 63, and make the vacuum cleaner work better. When the negative pressure in the sealing bag 5 is restored, the reset of the arc plate 83 will drive the sliding rod 91 to reset under the elastic force of the long spring 94. Each reset of the sliding rod 91 will drive the reset of the two fixed long rods 92. Each reset of the fixed long rod 92 will drive the reset of several rotating blades 93, so that the several rotating blades 93 resume their original rotation speed and continue to transport lower temperature air to the DC brushless motor 63 to continuously dissipate heat for the DC brushless motor 63.

[0052] Example 4

[0053] On the basis of Example 3, Figure 3-Figure 15As shown, it also includes a main guide plate 101 and an auxiliary guide plate 102, wherein the top ends of the two arc plates 83 are fixedly connected to the two main guide plates 101, and the two main guide plates 101 are both provided with through holes, and the through holes of the main guide plates 101 are located above the connector 84, and the top ends of the other two arc plates 83 are fixedly connected to the auxiliary guide plates 102.

[0054] The push block 82 moves to communicate with the bottom of the main air guide plate 101. Since the air temperature outside the vacuum cleaner is slightly lower than the air inside the vacuum cleaner, the rotating impeller group 64 can inhale the normal temperature air outside the DC brushless motor 63 when it rotates to dissipate the heat of the DC brushless motor 63. The movement of the two push blocks 82 will drive two of the arc plates 83 to move toward each other. The movement of the two arc plates 83 will drive the two main air guide plates 101 to move toward each other. The movement of the other two arc plates 83 will drive the two auxiliary air guide plates 102 to move toward each other, so that the air between the two main air guide plates 101 and the two auxiliary air guide plates 102 is They are in contact with each other to form a circle. The circle formed by the main guide plate 101 and the auxiliary guide plate 102 can retain the relatively low temperature air near the motor support ring 62, discharge the hot air near the DC brushless motor 63, reduce the average temperature of the air in the motor support ring 62, and further dissipate the heat of the DC brushless motor 63. When the negative pressure in the sealing bag 5 is restored, the resetting of two of the arc plates 83 will drive the resetting of the two main guide plates 101, and the resetting of the other two arc plates 83 will drive the resetting of the two auxiliary guide plates 102, so that the DC brushless motor 63 can dissipate heat more effectively, ensure normal working efficiency, and extend the working time of the DC brushless motor 63.

[0055] Example 5

[0056] On the basis of Example 4, Figure 6 As shown, a heat sink 11 is also included, and a plurality of heat sinks 11 are fixedly connected to the outside of the brushless DC motor 63 .

[0057] The plurality of heat sinks 11 can transfer the heat on the surface of the brushless DC motor 63 , thereby reducing the surface temperature of the brushless DC motor 63 and allowing the brushless DC motor 63 to dissipate heat more effectively.

[0058] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A brushless DC motor heat dissipation device for a vacuum cleaner, characterized in that: The invention comprises a bottom shell (1), an upper cover shell (2), an air outlet filter (3), a suction nozzle (4), a sealing bag (5), an air extraction mechanism and a flow guiding mechanism, wherein the top of the bottom shell (1) is clamped with the upper cover shell (2), the top of the upper cover shell (2) is fixedly connected with the air outlet filter (3), one side of the bottom shell (1) is fixedly connected with the suction nozzle (4), a sealing bag (5) is placed on the upper inner side of the bottom shell (1), the suction nozzle (4) is connected with the sealing bag (5) through the bottom shell (1), an air extraction mechanism is provided on the sealing bag (5), and a flow guiding mechanism is provided on the air extraction mechanism; The exhaust mechanism comprises a partition plate (61), a motor support ring (62), a DC brushless motor (63), a rotating impeller group (64), a sealing ring (65) and a multi-layer filter column (66); the partition plate (61) is placed on the sealing bag (5), and the partition plate (61) is in contact with the bottom end of the upper cover shell (2); the top of the partition plate (61) is fixedly connected to the motor support ring (62); the inner side of the motor support ring (62) is fixedly connected to the DC brushless motor (63); the output shaft of the DC brushless motor (63) is fixedly connected to the rotating impeller group (64); the inner side of the partition plate (61) is fixedly connected to the sealing ring (65); the rotating impeller group (64) is located in the sealing ring (65); the bottom of the partition plate (61) is fixedly connected to the multi-layer filter column (66); the multi-layer filter column (66) is located in the sealing bag (5); The sealing ring (65) is a hollow structure; The flow guide mechanism comprises a sliding ring (71), a compression spring (72), a connecting pipe (73) and a speed regulating valve (74); two sliding rings (71) are slidably connected to the partition plate (61); long through holes are provided on the two sliding rings (71); two compression springs (72) are connected between each sliding ring (71) and the partition plate (61); two connecting pipes (73) are slidably connected to the motor support ring (62); the long through holes of the two sliding rings (71) are communicated with one end of the connecting pipe (73); and the other ends of the two connecting pipes (73) are communicated with the speed regulating valve (74) on their inner sides.

2. A brushless DC motor heat dissipation device for a vacuum cleaner according to claim 1, characterized in that: The invention also comprises a moving mechanism, wherein the air extraction mechanism is provided with the moving mechanism, wherein the moving mechanism comprises an inclined push rod (81), a pushing block (82), an arc plate (83), a connector (84), and a small spring (85); the upper parts of the two connecting tubes (73) are fixedly connected with the inclined push rods (81); the upper part of the motor support ring (62) is slidably connected with two pushing blocks (82); the pushing blocks (82) are slidably connected with the inclined push rods (81); the two pushing blocks (82) are fixedly connected with the arc plate (83); the ends of the two connecting tubes (73) away from the sliding ring (71) are connected with the connector (84); the two connectors (84) are also slidably connected with the arc plate (83); the motor support ring (62) is slidably connected with the four arc plates (83); wherein two small springs (85) are respectively connected between the two arc plates (83) and the connector (84).

3. A brushless DC motor heat dissipation device for a vacuum cleaner according to claim 2, characterized in that: The two inclined surface push rods (81) are both provided with inclined grooves.

4. A brushless DC motor heat dissipation device for a vacuum cleaner according to claim 2, characterized in that: The arc plate (83) is an arc-shaped structure.

5. A brushless DC motor heat dissipation device for a vacuum cleaner according to claim 2, characterized in that: The invention also comprises a stirring mechanism, wherein the stirring mechanism is arranged on the motor support ring (62), and the stirring mechanism comprises a sliding rod (91), a fixed long rod (92), a rotating blade (93) and a long spring (94); four sliding rods (91) are slidably connected to the motor support ring (62); two fixed long rods (92) are fixedly connected to each of the sliding rods (91); a plurality of rotating blades (93) are rotatably connected to each of the fixed long rods (92); and a long spring (94) is connected between the arc plate (83) and the sliding rod (91).

6. A brushless DC motor heat dissipation device for a vacuum cleaner according to claim 5, characterized in that: It also includes a main deflector plate (101) and a secondary deflector plate (102), wherein the top ends of the two arc-shaped plates (83) are fixedly connected to the two main deflector plates (101), the two main deflector plates (101) are provided with through holes, the through holes of the main deflector plates (101) are located above the connector (84), and the top ends of the other two arc-shaped plates (83) are fixedly connected to the secondary deflector plates (102).

7. A brushless DC motor heat dissipation device for a vacuum cleaner according to claim 6, characterized in that: It also includes a heat sink (11), and a plurality of heat sinks (11) are fixedly connected to the outside of the DC brushless motor (63).

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