CN111009984B - A protective cover that can automatically cool down the motor at high temperatures - Google Patents

Abstract

The invention discloses a protective cover that can automatically cool down a motor at high temperature. It includes a base, and a motor can be placed on the upper end face of the base. The front and rear ends of the upper end face of the base are symmetrically provided with openings facing away from the A flipping cavity on one side of the symmetrical center of the base, a flipping plate for protecting the front and rear sides and the upper side of the motor is rotatably provided between the left and right walls of the flipping cavity, and the left and right end surfaces of the flipping board are respectively fixed with a left stopper plate and right baffle, the present invention seals the front, back, left and right and upper side of the motor through the symmetrically arranged turning plate, left baffle and right baffle, thereby protecting the motor, and at the same time passing between the clamping block and the motor output shaft Press it tightly to output part of the power of the output shaft. When the temperature of the motor rises, the installed temperature sensing device transmits this part of the power to the fan device, thereby realizing air circulation and cooling the motor.

Description

A protective cover that can automatically cool down the motor at high temperatures

technical field

The invention relates to the technical field of motor protection, in particular to a protection cover that can automatically cool down the motor at high temperature.

Background technique

Motors can be seen everywhere in daily life. In some places, when using motors, due to the harsh environment, the motors are easily damaged when they are directly placed in the outside world, causing losses. At the same time, they will also affect the work of the motor and affect the work. For sealing protection, the motor will generate a lot of heat during operation. The continuous accumulation of heat in the sealed space will cause high temperature, which will also cause damage to the motor. Although some protective covers can achieve cooling protection for the motor, an additional motor is required. It provides power and keeps cooling down all the time. It cannot start or stop automatically according to the motor temperature, and needs to be started manually. The present invention sets forth a device capable of solving the above-mentioned problems.

SUMMARY OF THE INVENTION

technical problem:

The existing motor protective cover needs an additional motor to cool down the motor, and cannot be automatically activated or closed according to the motor temperature, which is inconvenient to use.

In order to solve the above problems, a protective cover that can automatically cool the motor at high temperature is designed in this example. In this example, a protective cover that can automatically cool the motor at high temperature includes a base, and the motor can be placed in the On the upper end surface of the base, the front and rear ends of the upper end face of the base are symmetrically provided with a turning cavity with an opening facing away from the symmetrical center of the base. A turning plate for protecting the side and upper side, the left and right end surfaces of the turning plate are respectively fixed with a left baffle and a right baffle, the left baffle and the right baffle on the front and rear sides can be in contact with each other and the motor The left and right sides are protected, the right baffle is provided with a power device, and the power device is provided with a semi-circular through shaft hole which is located on the end face of the right baffle near the symmetrical center and penetrates left and right. The circular wall of the shaft hole is slidably provided with a clamping block that can be abutted against the output shaft of the motor. An arc cavity, a semi-circular rotating plate is slidably arranged in the arc cavity, the arc cavity on the front and rear sides is spliced into a circular ring, and the rotating plates on the front and rear sides are also spliced into a circular ring It can rotate in the circular arc cavity, a sliding magnet is fixed on the right end of the inner circular surface of the rotating plate, a fixed magnet is fixed on the inner right end of the circular wall of the circular arc cavity, and the left side of the base is provided with a fixed magnet. A fan device, a fan is arranged in the fan device, a temperature sensing device is arranged on the right side of the base, a lower pressing plate is arranged in the temperature sensing device, and the upper end surface of the base is fixedly arranged on the upper side of the lower pressing plate The heat conduction block can transfer the heat of the motor into the temperature sensing device and press down the lower pressure plate, thereby connecting the rotating plate with the fan power, and transferring the kinetic energy of the motor to the fan .

Preferably, the magnetic force between the sliding magnet and the fixed magnet is smaller than the friction force generated when the clamping block and the motor output shaft are pressed against each other.

Wherein, the fan device includes a fan cavity arranged on the left side of the base with an upward opening, the center of the lower wall of the fan cavity is rotatably provided with a fan shaft, and the fan is fixed on the upper end of the fan shaft, so The lower side of the fan cavity is provided with a bevel gear cavity, the lower end of the fan shaft extends into the bevel gear cavity and is fixedly provided with a driven bevel gear, and the right wall of the bevel gear cavity is rotatable with a gear meshing with the driven bevel gear. For the driving bevel gear of the bevel gear, a ventilation baffle is fixed at the opening of the fan cavity, and the lower wall of the fan cavity is symmetrical in front and back and communicates with an exhaust port with a downward opening.

Preferably, a ventilation cavity is provided in the turning plate, the inner wall of the ventilation cavity close to the symmetrical center is connected with a blower outlet, and the ventilation cavity is provided with a ventilation hole opening to the left near the rotation center of the turning plate. , a cooler is fixed in the left wall of the fan cavity, the front and rear sides of the cooler are symmetrical and connected with an air pipeline connected to the opening of the ventilation hole, and the left side of the cooler is connected with an opening to the left the air intake.

Wherein, the power device includes a semi-circular arc-shaped guide chute communicated between the through-shaft hole and the left half of the arc cavity. The connecting rod is fixedly connected between the clamping block and the rotating plate, a semi-circular-shaped rack is fixed in the outer circular surface of the rotating plate, and the circular arc cavity on the rear side communicates with A spur gear cavity with an opening downward, and a driving spur gear meshing with the rack is rotatably provided between the left and right walls of the spur gear cavity.

Preferably, a transmission cavity with an upward opening and communicating with the spur gear cavity is provided on the right side of the base and opposite to the lower side of the spur gear cavity. The drive spur gear meshes with the lower end of the drive spur gear, and the left wall of the drive cavity and facing the right side of the temperature sensing device is rotatably provided with a driven spur gear meshed with the front and bottom of the drive spur gear.

Wherein, the temperature sensing device includes an air pressure cavity provided in the base with an upward opening and located on the lower side of the heat conduction block. The heat conduction block can seal the opening of the air pressure cavity, and the lower pressure plate can slide up and down. It is arranged in the air pressure chamber, there is a certain gap between the lower pressure plate and the heat conduction block, the lower end of the lower pressure plate is fixed with a lower pressure rod, the lower side of the air pressure chamber is provided with a connection cavity, and the connection cavity There is a connecting plate which can be slid left and right, and a groove is arranged in the upper surface of the connecting plate, and the lower end of the pressing rod can extend into the groove and push the connecting plate to move to the right. There are sleeves running through the left and right sides, and a spline shaft is rotatably arranged in the left wall of the connection cavity. The left end of the spline shaft is fixedly connected to the shaft center of the driving bevel gear and the right end extends into the sleeve and splines The right wall of the connection cavity is rotatably provided with a transmission shaft, the right end of the transmission shaft is fixedly connected to the shaft center of the driven spur gear, and the left end can extend into the sleeve and be splined.

Preferably, a compression spring is fixedly connected between the lower end of the lower pressure plate and the lower wall of the air pressure chamber, and the compression spring can limit the air pressure required for the lower pressure plate to move downward, and is the Shift reset provides power.

Preferably, a tension spring is fixedly connected between the left end of the connecting plate and the left wall of the connecting cavity, and the tension spring can pull the connecting plate to move left and reset.

Preferably, a locking block is fixed at the upper end of the flipping plate, the locking blocks on the front and rear sides are symmetrically arranged, and the locking blocks on the front and rear sides can be clamped by screws and nuts, and the flipping board can be clamped. clamped.

The beneficial effects of the present invention are: the present invention seals the front, rear, left, right and upper sides of the motor through the symmetrically arranged turning plates, left baffles and right baffles, thereby protecting the motor, and at the same time, through the connection between the clamping block and the motor output shaft When the temperature of the motor rises, the installed temperature sensing device transmits this part of the power to the fan device, thereby realizing air circulation and cooling the motor.

Description of drawings

For ease of description, the present invention is described in detail by the following specific embodiments and accompanying drawings.

FIG. 1 is a schematic diagram of the overall structure of a protective cover that can automatically cool down a motor at a high temperature according to the present invention;

Fig. 2 is the structural representation of "A-A" direction in Fig. 1;

Fig. 3 is the structural representation of "B-B" direction in Fig. 1;

Fig. 4 is the structural representation of " C-C " direction in Fig. 1;

Fig. 5 is the structural representation of " D-D " direction in Fig. 1;

FIG. 6 is a schematic view of the structure in the “E-E” direction in FIG. 1 .

Detailed ways

Below in conjunction with Fig. 1-Fig. 6, the present invention will be described in detail, for the convenience of description, the azimuth mentioned below is now specified as follows: the up-down, left-right, front-rear directions mentioned below are consistent with the up-down, left-right, front-rear directions of the projection relationship of Fig. 1 itself.

The present invention relates to a protective cover that can automatically cool down the motor at high temperature, and is mainly applied to the protection of the motor. The present invention will be further described below with reference to the accompanying drawings of the present invention:

A protective cover that can automatically cool down a motor at high temperature according to the present invention includes a base 11, the motor can be placed on the upper end surface of the base 11, and the front and rear ends of the upper end surface of the base 11 are symmetrically provided with openings Facing the turning chamber 12 on the side away from the symmetrical center of the base 11, a turning plate 13 is rotatably provided between the left and right walls of the turning chamber 12 for protecting the front and rear sides and the upper side of the motor. The turning plate 13 The left and right end surfaces are respectively fixed with a left baffle 14 and a right baffle 15. The left baffle 14 and the right baffle 15 on the front and rear sides can be in contact with each other and protect the left and right sides of the motor. The plate 15 is provided with a power device 101, and the power device 101 is provided with a semi-circular through-shaft hole 16 which is located on the end face of the right baffle 15 near the symmetrical center and penetrates left and right. The through-shaft hole 16 has a circular wall. A clamping block 17 is slidably provided on the upper part, which can abut against the output shaft of the motor. The clamping blocks 17 on the front and rear sides are symmetrically arranged in the front and rear, and the through-shaft hole 16 is provided with a semi-circular arc on the side away from the symmetrical center. Cavity 18, the circular arc cavity 18 is slidably provided with a semi-circular ring-shaped rotating plate 19, the circular arc cavity 18 on the front and rear sides is spliced into a circular ring, and the rotating plates 19 on the front and rear sides are also spliced A sliding magnet 20 is fixed at the right end of the inner circular surface of the rotating plate 19, and a fixed magnet 21 is fixed at the right end of the inner circular wall of the circular arc cavity 18. , the left side of the base 11 is provided with a fan device 102, the fan device 102 is provided with a fan 22, the right side of the base 11 is provided with a temperature sensing device 103, and the temperature sensing device 103 is provided with a lower pressure plate 23. A heat-conducting block 24 located on the upper side of the lower pressing plate 23 is fixed on the upper end surface of the base 11 . The heat-conducting block 24 can transfer the heat of the motor to the temperature sensing device 103 and press down the lower pressing plate 23 , and further connect the rotating plate 19 with the fan 22 to transmit the kinetic energy of the motor to the fan 22 .

Advantageously, the magnetic force between the sliding magnet 20 and the fixed magnet 21 is smaller than the friction force generated when the clamping block 17 and the motor output shaft are pressed against each other.

According to an embodiment, the fan device 102 will be described in detail below. The fan device 102 includes a fan cavity 25 located on the left side of the base 11 and opening upward, and a fan is rotatably provided in the center of the lower wall of the fan cavity 25 Shaft 26, the fan 22 is fixed on the upper end of the fan shaft 26, a bevel gear cavity 27 is arranged on the lower side of the fan cavity 25, and the lower end of the fan shaft 26 extends into the bevel gear cavity 27 and is fixed with a bevel gear cavity 27. Driven bevel gear 28, the right wall of the bevel gear cavity 27 is rotatably provided with a drive bevel gear 29 that meshes with the driven bevel gear 28, and a ventilation baffle 30 is fixed at the opening of the fan cavity 25. The lower wall of the fan cavity 25 is symmetrical in front and rear and communicates with an exhaust port 37 which opens downward.

Beneficially, a ventilation cavity 31 is provided in the turning plate 13 , an inner wall of the ventilation cavity 31 close to the center of symmetry is communicated with an air outlet 32 , and an opening is formed in the ventilation cavity 31 near the rotation center of the turning plate 13 . To the left vent hole 33, a cooler 34 is fixed in the left wall of the fan cavity 25. The front and rear sides of the cooler 34 are symmetrical and communicated with an air pipeline 35 that communicates with the opening of the vent hole 33. The left side of the cooler 34 is communicated with an air inlet 36 which opens to the left.

According to an embodiment, the power device 101 will be described in detail below. The power device 101 includes a semi-circular arc guide chute 40 that communicates with the left half between the through-shaft hole 16 and the arc cavity 18 , Connecting rods 41 fixedly connected between the clamping block 17 and the rotating plate 19 are respectively slidable in the guide grooves 40 on the front and rear sides. For the semi-circular-shaped rack 42, a spur gear cavity 43 with a downward opening is connected to the lower and rear of the circular arc cavity 18 on the rear side. Drive spur gear 44 of rack 42 .

Beneficially, on the right side of the base 11 and facing the lower side of the spur gear cavity 43 is a transmission cavity 45 which opens upward and communicates with the spur gear cavity 43 . There is a transmission spur gear 46 that can be engaged with the lower end of the driving spur gear 44 . The left wall of the transmission cavity 45 and facing the right side of the temperature sensing device 103 is rotatable and engages in front of the transmission spur gear 46 . The driven spur gear 47 below.

According to an embodiment, the temperature sensing device 103 will be described in detail below. The temperature sensing device 103 includes an air pressure cavity 48 provided in the base 11 with an upward opening and located on the lower side of the heat conducting block 24. The heat conducting block 24 can be The opening of the air pressure chamber 48 is sealed, and the lower pressure plate 23 can be slid up and down in the air pressure chamber 48. There is a certain gap between the lower pressure plate 23 and the heat conduction block 24, and the lower pressure plate 23 A lower pressure rod 49 is fixed at the lower end, a connecting cavity 50 is arranged on the lower side of the air pressure cavity 48, a connecting plate 51 is slidable in the connecting cavity 50, and a groove is formed in the upper end surface of the connecting plate 51 52. The lower end of the pressing rod 49 can extend into the groove 52 and push the connecting plate 51 to move to the right. The connecting plate 51 is provided with a sleeve 53 left and right, and the left wall of the connecting cavity 50 A spline shaft 54 is rotatably provided, the left end of the spline shaft 54 is fixedly connected to the axis of the drive bevel gear 29 and the right end extends into the sleeve 53 and is splined connected, and the right wall of the connection cavity 50 A drive shaft 55 is rotatably provided inside, the right end of the drive shaft 55 is fixedly connected to the shaft center of the driven spur gear 47 and the left end can extend into the sleeve 53 and be splined.

Beneficially, a compression spring 56 is fixedly connected between the lower end of the lower pressing plate 23 and the lower wall of the air pressure chamber 48 . The lower pressing plate 23 is moved up and reset to provide power.

Beneficially, a tension spring 61 is fixedly connected between the left end of the connecting plate 51 and the left wall of the connecting cavity 50 , and the tension spring 61 can pull the connecting plate 51 to move left and reset.

Beneficially, a locking block 60 is fixed on the upper end of the flip plate 13 , the locking blocks 60 on the front and rear sides are symmetrically arranged, and the locking blocks 60 on the front and rear sides can be clamped and all The flip plate 13 is clamped.

The following describes in detail the steps of using a protective cover that can automatically cool the motor at high temperatures in this paper with reference to FIGS. 1 to 6 :

In the initial state, the turning plate 13, the left baffle 14 and the right baffle 15 are located on the upper side of the base 11, the front and rear rotating plates 19 and the racks 42 are respectively located in the front and rear arc cavities 18, and the front and rear sides are clamped by the blocks. 17 are respectively located in the through-shaft holes 16 on the front and rear sides, the fixed magnet 21 and the sliding magnet 20 attract and align with each other, the driving spur gear 44 meshes with the transmission spur gear 46, and the lower pressing plate 23 is located at the upper limit position under the elastic force of the compression spring 56 , the connecting plate 51 is located at the left limit, and the transmission shaft 55 is not connected with the sleeve 53 .

When in use, manually flip the flip plate 13 to open the front and rear sides. At this time, the left baffle 14 and the right baffle 15 on the front and rear sides are also flipped to the front and rear sides to move away. At this time, the motor is placed on the upper side of the base 11 and the The output faces to the right, and the heat conduction block 24 is in contact with the bottom of the motor. At this time, the turning plate 13, the left baffle 14 and the right baffle 15 are manually turned over and reset, and then the motor is sealed. The hole 16 is assembled into a complete circle, the arc cavity 18 on the front and rear sides is assembled into a complete ring, the rotating plates 19 and the rack 42 on the front and rear sides are also assembled into a complete ring, and the output shaft of the motor passes through the through shaft. The hole 16 protrudes, and the clamping blocks 17 on the front and rear sides are pressed against the output shaft. When the motor starts, since the frictional force between the clamping block 17 and the output shaft is greater than the attractive force between the sliding magnet 20 and the fixed magnet 21, The output shaft drives the clamping block 17 to rotate through friction, and drives the rotating plate 19 to rotate through the connecting rod 41, which in turn drives the rotating plate 19 and the rack 42 to rotate in the arc cavity 18, and then drives the driving spur gear 44 to rotate through gear meshing. The transmission spur gear 46 is driven to rotate and the driven spur gear 47 is driven to rotate through the gear meshing, which in turn drives the transmission shaft 55 to rotate. At the beginning, the transmission shaft 55 is idling, but when the temperature rises with the use of the motor, the temperature is transmitted to the In the air pressure chamber 48, the air on the upper side of the lower pressure plate 23 is heated and expanded to press down the lower pressure plate 23 and compress the compression spring 56, thereby driving the lower end of the lower pressure rod 49 to descend into the groove 52 and driving the connecting plate 51 to move to the right. When the cylinder 53 is moved to the right to connect with the transmission shaft 55, the transmission shaft 55 drives the sleeve 53 to rotate through the spline connection and drives the spline shaft 54 to rotate, and then the electric driving bevel gear 29 rotates, which drives the driven bevel gear 28 to rotate through gear meshing. , the fan 22 is driven to rotate by the fan shaft 26, and then the air in the sealed space formed by the turning plate 13, the left baffle 14 and the right baffle 15 is drawn downward, and the hot air is discharged through the exhaust port 37. A low pressure is generated in the space, and at the same time, the outside air enters the cooler 34 through the air inlet 36 for cooling, and the air after the cold zone enters the ventilation cavity 31 through the air pipeline 35 and the ventilation hole 33, and then blows to the motor through the air outlet 32. The temperature is lowered until the temperature of the motor drops to the point where the sleeve 53 moves to the left and is disconnected from the transmission shaft 55 .

The beneficial effects of the present invention are: the present invention seals the front, rear, left, right and upper sides of the motor through the symmetrically arranged turning plates, left baffles and right baffles, thereby protecting the motor, and at the same time, through the connection between the clamping block and the motor output shaft When the temperature of the motor rises, the installed temperature sensing device transmits this part of the power to the fan device, thereby realizing air circulation and cooling the motor.

In the above manner, those skilled in the art can make various changes according to the working mode within the scope of the present invention.

Claims (10)

1. The utility model provides a can carry out the safety cover of cooling down to the motor automatically when high temperature, includes the base, can place the motor in base up end, its characterized in that: the front end and the rear end in the upper end face of the base are symmetrically provided with turnover cavities with openings facing away from one side of the symmetry center of the base, a turnover plate for protecting the front side, the rear side and the upper side of a motor is rotatably arranged between the left wall and the right wall of the turnover cavity, the left end face and the right end face of the turnover plate are respectively and fixedly provided with a left baffle plate and a right baffle plate, the left baffle plate and the right baffle plate at the front side and the rear side can be abutted against each other and can protect the left side and the right side of the motor, a power device is arranged in the right baffle plate, a semicircular through-hole which is positioned at one side end face of the right baffle plate close to the symmetry center and penetrates left and right is arranged in the power device, a clamping block which can abut against an output shaft of the motor is slidably arranged on the circular wall of the through-hole, the front side, the front side and the rear side of the circular arc cavity are spliced into a circular ring, the front side and the rear side of the rotating plate are spliced into a circular ring and can rotate in the circular arc cavity, a sliding magnet is fixedly arranged at the inner right end of the inner circular surface of the rotating plate, and a fixed magnet is fixedly arranged at the inner right end of the inner circular wall of the circular arc cavity; the fan device is arranged on the left side in the base, a fan is arranged in the fan device, the temperature sensing device is arranged on the right side in the base, a lower pressing plate is arranged in the temperature sensing device, a heat conducting block located on the upper side of the lower pressing plate is fixedly arranged on the upper end face of the base, the heat conducting block can transmit heat of the motor into the temperature sensing device and press the lower pressing plate downwards, and then the rotating plate is connected with the fan in a power mode, and kinetic energy of the motor is transmitted to the fan.

2. The protective cover for an electric motor capable of automatically cooling down at high temperature according to claim 1, wherein: the magnetic force between the sliding magnet and the fixed magnet is smaller than the friction force generated when the clamping block is tightly propped against the output shaft of the motor.

3. The protective cover for an electric motor capable of automatically cooling down at high temperature according to claim 2, wherein: the fan device is including locating the ascending fan chamber of left side and opening in the base, the rotatable fan axle that is equipped with in fan chamber lower wall center, the fan is fixed to be located fan axle upper end, fan chamber downside is equipped with the bevel gear chamber, fan axle lower extreme extends to the bevel gear intracavity is fixed and is equipped with driven bevel gear, the rotatable meshing that is equipped with of bevel gear chamber right side wall is in driven bevel gear's drive bevel gear, the fixed ventilative baffle that is equipped with of fan chamber opening part, symmetry and intercommunication are equipped with the gas vent that the opening is decurrent around the fan chamber lower wall.

4. The protective cover for automatically cooling a motor at a high temperature according to claim 3, wherein: the improved fan is characterized in that a ventilation cavity is arranged in the turnover plate, a blowing opening is formed in the ventilation cavity through communicating the inner wall of one side, close to the symmetric center, of the turnover plate, an air vent with an opening towards the left is formed in the rotation center of the turnover plate, a cooler is fixedly arranged in the left wall of the fan cavity, air transmission pipelines communicated with the air vent are symmetrically arranged on the front side and the rear side of the cooler in a communicating mode, and an air inlet with an opening towards the left is formed in the left side of the cooler in a communicating mode.

5. The protective cover for an electric motor capable of automatically cooling down at high temperature according to claim 4, wherein: the power device is located including the intercommunication lead to the shaft hole with the semicircular arc's of half a left side between the arc chamber spout, both sides around slidable respectively in the spout be equipped with fixed connection in press from both sides tight piece with connecting rod between the rotor plate, rotor plate excircle internal fixation is equipped with the rack of semicircle ring type, the rear side the rear intercommunication is equipped with the decurrent spur gear chamber of opening under the arc chamber, rotatable being equipped with between the wall of the left and right sides of spur gear chamber mesh in the initiative straight-teeth gear of rack.

6. The protective cover for an electric motor capable of automatically cooling down at high temperature according to claim 5, wherein: the temperature sensing device is characterized in that a transmission cavity with an upward opening and communicated with the straight gear cavity is arranged on the right side in the base and right opposite to the lower side of the straight gear cavity, a transmission straight gear capable of being meshed with the lower end of the driving straight gear is rotatably arranged in the transmission cavity, and a driven straight gear meshed with the front lower part of the transmission straight gear is rotatably arranged on the left wall of the transmission cavity and right opposite to the right side of the temperature sensing device.

7. The protective cover for an electric motor capable of automatically cooling down at high temperature according to claim 6, wherein: the temperature sensing device comprises an air pressure cavity which is arranged in the base and has an upward opening and is positioned on the lower side of the heat conducting block, the opening of the air pressure cavity can be sealed by the heat conducting block, the lower pressing plate can be arranged in the air pressure cavity in a vertical sliding manner, a certain gap is formed between the lower pressing plate and the heat conducting block, a lower pressing rod is fixedly arranged at the lower end of the lower pressing plate, a connecting cavity is arranged at the lower side of the air pressure cavity, a connecting plate is arranged in the connecting cavity in a horizontal sliding manner, a groove is arranged in the upper end surface of the connecting plate, the lower end of the lower pressing rod can extend into the groove and push the connecting plate to move right, a sleeve is arranged in the connecting plate in a left-right penetrating manner, a spline shaft is rotatably arranged in the left wall of the connecting cavity, the left end of the spline shaft is fixedly, the right end of the transmission shaft is fixedly connected with the axis of the driven straight gear, and the left end of the transmission shaft can extend into the sleeve and is connected with the sleeve through a spline.

8. The protective cover for an electric motor capable of automatically cooling down at high temperature according to claim 7, wherein: and a compression spring is fixedly connected between the lower end of the lower pressing plate and the lower wall of the air pressure cavity.

9. The protective cover for an electric motor capable of automatically cooling down at high temperature according to claim 8, wherein: and an extension spring is fixedly connected between the left end of the connecting plate and the left wall of the connecting cavity.

10. The protective cover for an electric motor capable of automatically cooling a motor at a high temperature as claimed in claim 9, wherein: the upper end of the turnover plate is fixedly provided with locking blocks, and the locking blocks are symmetrically arranged on the front side and the rear side.

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