Motor with active heat dissipation adjustment function

Abstract

The utility model relates to a motor with active heat dissipation adjustment function belongs to motor field, to solve the problem that the outside oil mist, dust impurity can through the instantaneous gap generated by vibration and continue to infiltrate the inside of protective sleeve, gradually adhere and accumulate on the temperature measuring contact surface at the bottom of inductor, simultaneously, the low -speed motor has no high -speed centrifugal self -cleaning ability, aggravate the problem of temperature measuring invalidation, a motor with active heat dissipation adjustment function, including motor shell, the bearing of setting in the inside of motor shell, the rotating shaft of setting in the inside of bearing, the base of fixed connection in the lower end of motor shell, through rotating shaft drive rotating plate and guide groove rotation, utilize the opposite circular arc groove of first and last intercommunication periodicity push pull rod and pull plate up and down movement, form the negative pressure above pull plate, the impurity that accumulated on the temperature measuring contact surface at the bottom of external sensor is sucked away, thereby reached the effect that reduce the influence of impurity to sensor, make sensor can more accurately provide data to control board, and further control fan carries out more reasonable cooling effect.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and in particular to an electric motor with active heat dissipation regulation function. Background Technology

[0002] Currently, in industrial sectors, especially in textiles, metal products, and papermaking, low-speed, high-torque equipment such as torque motors and cycloidal geared motors commonly use external temperature sensors mounted on the motor bearing housing to achieve real-time monitoring and automatic cooling control of the bearing temperature. In existing installation structures, welding is strictly prohibited between the temperature sensor and the motor bearing housing. This is partly to preserve the sensor's detachable and replaceable maintenance characteristics, facilitating later equipment maintenance, sensor replacement due to aging, and troubleshooting; and partly because the high temperatures of welding can easily damage the motor bearing housing structure, cause the bearing grease to deteriorate and carbonize, and alter the housing's thermal conductivity, resulting in inaccurate temperature measurement. Therefore, the industry uniformly adopts a bonding assembly structure.

[0003] These types of motors are often used in complex applications such as metal cutting, wire winding, textile winding, and paper rewinding. During operation, both air and water cooling are required to ensure stable motor operation. However, the airflow in these applications often contains a large amount of emulsified oil mist, cutting oil, fiber debris, and metal powder. These impurities continuously diffuse and accumulate at the contact surface between the sensor and the bearing housing. This accumulation forms a heat-insulating layer, hindering the normal conduction of heat from the bearing to the sensor. This results in problems such as low temperature readings, delayed response, and data drift, directly causing inaccurate control of the automatic cooling system and leading to hidden overheating of the motor bearings and abnormal heat dissipation.

[0004] To delay the direct accumulation of impurities and contamination of the temperature sensing contact surface, existing technologies generally add a protective sleeve structure to the outside of the sensor. A high-temperature resistant rubber pad at the bottom of the protective sleeve adheres to the outer side of the bearing housing, forming a physical isolation barrier to prevent large particles of impurities and oil from directly contacting the temperature sensing area. However, in actual industrial conditions, these low-speed, high-torque motors inherently exhibit severe vibration. Combined with factors such as the vibration of surrounding equipment, load tension fluctuations, and eccentric winding impacts, the entire equipment is continuously in a state of high-frequency vibration. Long-term vibration repeatedly stretches and opens the contact surface between the rubber pad and the bearing housing, leading to rubber pad seal failure, edge peeling, and the formation of tiny leakage gaps.

[0005] External oil mist and dust impurities can continuously seep into the protective sleeve through the instantaneous gaps created by vibration, gradually adhering and accumulating on the temperature-sensing contact surface at the bottom of the sensor. Simultaneously, the lack of high-speed centrifugal self-cleaning capability in the low-speed motor exacerbates the temperature measurement failure problem. Furthermore, existing external sensors are mostly located in concealed positions inside the motor, in confined spaces, making disassembly and assembly cumbersome. Once the contact area becomes contaminated, manual cleaning and maintenance are difficult and costly, and frequent maintenance severely impacts the continuous production efficiency of the equipment. The existing protective structure cannot fully adapt to the harsh industrial conditions of low-speed, high-vibration, high oil content, and high dust levels. Summary of the Invention

[0006] The purpose of this invention is to provide a motor with active heat dissipation and regulation function, which solves the problem that external oil mist, dust and impurities can continuously seep into the protective sleeve through the instantaneous gaps generated by vibration, and gradually adhere and accumulate on the temperature measuring contact surface at the bottom of the sensor; at the same time, the low-speed motor lacks high-speed centrifugal self-cleaning ability, which aggravates the temperature measurement failure.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a motor with active heat dissipation adjustment function, comprising a motor housing, a bearing disposed inside the motor housing, a rotating shaft disposed inside the bearing, a base fixedly connected to the lower end of the motor housing, a fan fixedly connected to one side of the base, a control board fixedly connected to one side of the fan, and an external sensor electrically connected to the control board, characterized in that a pulling mechanism is provided inside the motor housing; The pulling mechanism includes a protective sleeve disposed inside a first hole inside the motor housing, a first connecting pipe connected to the upper end of the protective sleeve, and a pull plate disposed on the inner side of the upper end of the protective sleeve; The pulling mechanism is used to drive the pull plate to move up and down when the shaft rotates, creating a negative pressure above the pull plate to suck away impurities accumulated on the temperature measuring contact surface at the bottom of the external sensor.

[0008] Preferably, the protective sleeve is bolted to the motor housing, and the lower end of the protective sleeve is a rubber sleeve, which is used to maintain a sealed fit with the temperature measuring contact surface during vibration; the outer side of the pull plate fits against the inner side of the upper end of the protective sleeve.

[0009] Preferably, the pulling mechanism further includes a rotating plate fixedly connected to the outside of the rotating shaft, a guide groove disposed on the inside of the rotating plate, a second hole disposed inside the upper end of the protective sleeve, a pull rod disposed on the inside of the second hole and fixedly connected to the pull plate, and a guide rod disposed on the inside of the guide groove and fixedly connected to the pull rod.

[0010] Preferably, the guide groove is composed of two arc grooves facing opposite directions connected end to end, and is in clearance fit with the guide rod, used to drive the guide rod and the pull rod to reciprocate up and down when the shaft rotates.

[0011] Preferably, a pushing mechanism is provided on the inner side of the pulling mechanism. The pushing mechanism includes a cover plate that is vertically slidably connected to the upper surface of the pulling plate, a third hole provided on the inner side of the pulling plate, a first baffle that is fixedly connected to the inner side of the upper end of the protective sleeve, and a second air pipe that is connected to the outer side of the upper end of the protective sleeve and communicates with the inner side of the first baffle. The cover plate is wider than the third hole, and is used to close the third hole to create negative pressure when the pull plate moves upward, and is pushed open by the gas when the pull plate moves downward to allow the gas to pass through.

[0012] Preferably, a filter screen is provided at the upper inlet of the first connecting pipe and fixedly connected to the first baffle, which is used to filter impurities and exchange heat with the air outside the protective sleeve when the gas flows through, so that the gas reaching the top of the protective sleeve is clean and the temperature is reduced.

[0013] Preferably, the pushing mechanism further includes a second baffle rotatably connected to the inner side of the lower part of the protective sleeve; an external sensor is nested inside the second baffle, and the interior of the second baffle is provided with a vent hole; The second baffle is used to rotate as airflow passes through, causing the vent to generate a rotating airflow.

[0014] Preferably, the vent holes are circumferentially distributed on the inner side of the second baffle, and the central axis of the vent holes is inclined to the central axis of the external sensor, so as to generate a rotational shear force to strip away impurities from the flowing gas and to form a circumferential pressure difference around the external sensor to generate a correction and reset force.

[0015] Preferably, the external sensor is bolted to the protective sleeve, so that when replacement is needed, the entire protective sleeve can be removed first, and then the external sensor can be disassembled, thus achieving convenient disassembly and assembly.

[0016] Preferably, the frequency of the up-and-down movement of the pull plate is determined by the rotation frequency of the rotating shaft, so as to adaptively match the cleaning frequency with the impurity accumulation speed.

[0017] 1. Compared with the prior art, the beneficial effects of the present invention are as follows: The rotating shaft drives the rotating plate and guide groove to rotate, and the opposing circular arc grooves connected end-to-end periodically push the pull rod and pull plate to move up and down, creating a negative pressure above the pull plate, which draws away impurities accumulated on the temperature-sensing contact surface at the bottom of the external sensor. This achieves the effect of reducing the influence of impurities on the sensor, enabling the sensor to provide more accurate data to the control board, and thus controlling the fan for more efficient cooling.

[0018] 2. In this invention, when the pull plate moves downwards, the gas exchanges heat with the air outside the protective sleeve through the first connecting pipe and filter screen. This lowers the temperature and cleans the gas reaching the top of the protective sleeve. This low-temperature clean gas is then directed to the bottom of the sensor during the next negative pressure cleaning cycle. The difference in thermal expansion and contraction causes the solidified dirt to crack and fall off, while simultaneously preventing high-temperature damage to the temperature sensing element. This achieves the effects of reducing sensor damage, improving cleaning efficiency, and protecting temperature sensing performance.

[0019] 3. In this invention, when the clean, low-temperature gas moves downwards, it forms a rotating airflow through the circumferentially distributed inclined vents on the second baffle. The rotating shear force makes it easier for impurities to fall off and be adsorbed and carried away. At the same time, the swirling airflow surrounds the sensor, generating a circumferential pressure difference, which creates a restoring thrust on the warped edge. Combined with the slight negative pressure inside the protective sleeve, this applies a uniform downward adsorption force to the sensor. The coupling of these two forces dynamically corrects the wedge-shaped gap and reduces instantaneous opening caused by vibration, ensuring that the rubber pad is subjected to uniform force throughout its circumference. This achieves the effect of making the data transmitted by the external sensor more accurate.

[0020] 4. During the negative pressure cleaning process, this invention re-filters and cools the gas inside the protective sleeve, reducing damage to the external sensor from high-temperature gas. When the sensor needs to be replaced, first remove the bolts securing the protective sleeve to remove it as a whole, and then remove the bolts securing the sensor. This achieves the effect of convenient disassembly and assembly.

[0021] 5. The frequency of the up-and-down movement of the pull plate in this invention is determined by the rotational frequency of the motor. The faster the motor speed and the faster the impurities accumulate, the faster the cleaning frequency also increases. This achieves the effect of adaptive adjustment of the cleaning speed. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the left-side cross-sectional structure of the motor housing of the present invention; Figure 3 This is a schematic diagram of the left cross-sectional structure of the protective sleeve of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle; Figure 5 This is a top view of the pull plate structure of the present invention; Figure 6 This is a top view of the second baffle structure of the present invention; Figure 7 This is a three-dimensional schematic diagram of the second baffle of the present invention; Figure 8 This is a schematic diagram of the external structure of the guide groove of the present invention.

[0023] In the diagram: 1. Motor housing; 2. Bearing; 3. Shaft; 4. Base; 5. Fan; 6. Control board; 7. External sensor; 8. Pulling mechanism; 9. First hole; 10. Pushing mechanism; 11. Filter screen; 81. Protective sleeve; 82. Rubber sleeve; 84. First connecting pipe; 85. Pull plate; 86. Rotating plate; 87. Guide groove; 88. Second hole; 89. Pull rod; 810. Guide rod; 101. Cover plate; 102. Third hole; 104. First baffle; 105. Second air pipe; 106. Second baffle; 107. Vent. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1-8 This invention provides a motor with active heat dissipation adjustment function, including a motor housing 1, a bearing 2 disposed inside the motor housing 1, a rotating shaft 3 disposed inside the bearing 2, a base 4 fixedly connected to the lower end of the motor housing 1, a fan 5 fixedly connected to one side of the base 4, a control board 6 fixedly connected to one side of the fan 5, and an external sensor 7 electrically connected to the control board 6. When the motor is working normally, the power is turned on, and the control board 6 and the fan 5 are simultaneously powered on, which electrically drives the rotating shaft 3 to rotate, so that the bearing 2 heats up and the temperature parameter is captured by the external sensor 7. The temperature is transmitted to the control board 6 for analysis, and the wind speed of the fan 5 is adjusted to avoid the motor overheating. A pulling mechanism 8 is provided inside the motor housing 1.

[0026] This device is primarily used in low-speed, high-torque applications of torque motors, such as unwinding iron coils, winding wire, rewinding paper, and textile winding. In these applications, the torque motor typically operates at speeds of a few to tens of revolutions per minute, representing extremely low-speed operation. Correspondingly, the rotating plate 86 and guide groove 87, fixedly connected to the outside of the rotating shaft 3, also operate at speeds of a few to tens of revolutions per minute. At these extremely low speeds, the impact force on the guide rod 810 at the inflection point of the connecting arc groove in the guide groove 87 is minimal (inertial force is proportional to the square of the rotational speed; a reduction of one order of magnitude in rotational speed results in a reduction of two orders of magnitude in impact force), and the wear rate is far lower than under conventional high-speed conditions. Therefore, the structural design of this device is perfectly suited for the aforementioned low-speed applications, and it meets the requirements for the entire lifespan of the motor without requiring additional reinforcement.

[0027] The lower end of the protective sleeve 81 is configured as a rubber sleeve 82, which directly contacts the temperature-sensing contact surface on the outside of the bearing 2. There are three reasons for using a rubber sleeve 82 instead of a rigid metal contact: First, the rubber material is soft and will not scratch or indent the metal housing of the bearing 2 during vibration, thus avoiding damage to the bearing structure; second, the rubber sleeve 82 and the bearing 2 housing are in close contact, with an extremely small contact gap (approximately 0.01-0.05 mm). When external oil mist, dust, or impurities seep in through this tiny gap during vibration, because the first connecting pipe 84 is continuously under negative pressure, the seeping impurities will be immediately absorbed by the airflow upon entry. The impurities will not linger or accumulate at the contact surface between the rubber sleeve 82 and the bearing 2, thus preventing the formation of a crust. Thirdly, the inner diameter of the first connecting pipe 84 is relatively small (8-12mm). According to Bernoulli's principle, under the same flow rate, the smaller the pipe cross-sectional area, the higher the flow velocity and the greater the pressure. This small-diameter pipe design ensures that the negative pressure cleaning airflow has sufficient velocity and pressure to quickly remove the impurities that have just seeped in, achieving an active protection effect of seeping in and removing impurities at the same time, thereby preventing impurities from accumulating on the temperature measuring contact surface for a long time and forming a heat insulation layer.

[0028] The pulling mechanism 8 includes a protective sleeve 81 disposed inside the first hole 9 inside the motor housing 1, a first connecting pipe 84 communicating with the upper end of the protective sleeve 81, and a pull plate 85 disposed on the inner side of the upper end of the protective sleeve 81.

[0029] The pulling mechanism 8 is used to drive the pull plate 85 to move up and down when the rotating shaft 3 rotates, forming a negative pressure above the pull plate 85 to suck away the impurities accumulated on the temperature measuring contact surface at the bottom of the external sensor 7.

[0030] The protective sleeve 81 is bolted to the motor housing 1. The lower end of the protective sleeve 81 is a rubber sleeve 82, which is used to keep the temperature measuring contact surface sealed during vibration. The outer side of the pull plate 85 is in contact with the inner side of the upper end of the protective sleeve 81.

[0031] The pulling mechanism 8 also includes a rotating plate 86 fixedly connected to the outside of the rotating shaft 3, a guide groove 87 disposed on the inside of the rotating plate 86, a second hole 88 disposed inside the upper end of the protective sleeve 81, a pull rod 89 disposed on the inside of the second hole 88 and fixedly connected to the pull plate 85, and a guide rod 810 disposed on the inside of the guide groove 87 and fixedly connected to the pull rod 89.

[0032] The guide groove 87 is composed of two arc grooves facing opposite directions connected end to end, and is in clearance fit with the guide rod 810. It is used to drive the guide rod 810 and the pull rod 89 to reciprocate up and down when the rotating shaft 3 rotates.

[0033] The external sensor 7 typically uses a thermocouple or resistance temperature detector (RTD) (such as Pt100) as the temperature sensing element. Its working principle is based on the thermoelectric effect or the characteristic of resistance changing with temperature, converting the temperature signal into an electrical signal and transmitting it to the control board 6. This temperature measurement method requires a good thermal conduction path between the temperature sensing contact surface of the sensor 7 and the bearing 2 housing; that is, heat needs to be transferred from the bearing 2 housing through the contact surface, the sensor housing, and the internal thermal grease to the temperature sensing element. When dust, oil, or other impurities accumulate on the temperature sensing contact surface, a low thermal conductivity insulation layer is formed (thermal conductivity approximately 0.1-0.5 W / (m·K), far lower than the 40-60 W / (m·K) of steel). This insulation layer hinders the normal conduction of heat from the bearing. In this case, the temperature measured by the sensor 7 is not the actual temperature of the bearing 2, but rather the lower temperature outside the insulation layer, resulting in an underestimation of the temperature (the deviation can reach 5-15℃). When control board 6 receives a low temperature signal, it determines that the motor has not reached the temperature threshold requiring enhanced cooling. Consequently, it either does not increase the fan speed of 5 or delays increasing it, resulting in bearing 2 actually being overheated but not receiving the corresponding cooling airflow. This can lead to hidden overheating of the motor bearing, accelerated deterioration of the lubricating grease, and even bearing burnout, among other equipment hazards. Therefore, removing impurities from the temperature sensing contact surface is a crucial prerequisite for ensuring accurate temperature measurement and proper cooling control of fan 5.

[0034] The core function of this device is to remove loose dust and floating particles accumulated on the temperature-sensing contact surface at the bottom of the sensor, rather than removing firmly attached oil stains and scale. Loose dust has weak adhesion and can be peeled off with slight negative pressure. To reduce flow resistance and improve negative pressure transmission efficiency, the first connecting pipe 84 is made of stainless steel with a smooth inner wall, designed with an inner diameter of 8-12 mm, much larger than the annular gap (approximately 0.5-1 mm) at the bottom of the sensor, and the pipe length is controlled within 80-150 mm, with a total flow volume of approximately 5-10 mL. The pull plate 85 has a stroke designed of 5-10 mm. When the pull plate reciprocates at a frequency of several hundred times per minute, the volume change rate of the cavity above the pull plate can reach 50-200 mL / s, sufficient to generate an instantaneous negative pressure peak of approximately 500-2000 Pa at the bottom of the sensor. This negative pressure is sufficient to overcome the gravity and van der Waals adhesion of the loose dust.

[0035] Furthermore, the space between the upper surface of the pull plate 85 and the first baffle 104 is much larger than the space between the first connecting pipe 84 and the bottom of the sensor, forming a large cavity suction effect on the small cavity, ensuring that the negative pressure attenuation is within a controllable range. For solidified oil stains and scale, this device can be used in conjunction with chemical cleaning agents during shutdown maintenance, with negative pressure cleaning as an auxiliary method.

[0036] When the torque motor or cycloidal geared motor operates at speeds of several hundred to over a thousand revolutions per minute, the guide groove 87 rotates at high speed accordingly. However, as mentioned earlier, in low-speed scenarios such as unwinding iron coils, the rotational speed is only a few to tens of revolutions per minute, and wear issues here do not pose a practical engineering obstacle. To reduce the impact force on the guide rod 810 at the inflection point of the connecting arc groove, the profile of the guide groove 87 is optimized: the inflection point between the two arc grooves facing opposite directions is provided with a rounded transition with a radius R≥2mm, rather than a sharp inflection point, so that the velocity direction change of the guide rod 810 at the inflection point is gradual, and the instantaneous acceleration is reduced. The guide rod 810 and the guide groove 87 are fitted with a clearance (0.05-0.1mm) and are made of bearing steel with surface carburizing hardening treatment (hardness ≥HRC58) to enhance wear resistance. At the same time, the end of the guide rod 810 is set as a hemispherical shape to further reduce the frictional contact stress with the groove wall. Under normal lubrication conditions, it meets the long-term operating requirements of the motor. If the working conditions are extremely harsh, the service life can be further extended by replacing it with a high-toughness alloy material (such as 18Ni maraging steel).

[0037] In actual industrial conditions, low-speed, high-torque motors inherently vibrate violently. Combined with the vibrations of surrounding equipment, load tension fluctuations, and eccentric winding impacts, the entire equipment is continuously in a high-frequency vibration state. Long-term vibration causes repeated stretching, leading to rubber gasket seal failure, edge opening and warping, forming tiny leakage gaps. This allows external oil mist and dust impurities to continuously seep into the protective sleeve through these momentary gaps, gradually adhering and accumulating on the temperature-sensing contact surface at the bottom of the sensor. When the rotating shaft 3 rotates, it drives the rotating plate 86 and guide groove 87 to rotate. Because the guide groove 87 is composed of two arc grooves facing opposite directions connected end-to-end, and the guide groove 87 and guide rod 810 are in a clearance fit, when the large arc of the guide groove 87 contacts the guide rod 810, the guide rod 810 will not move up and down. When the small arc of the guide groove 87 contacts the guide rod 810... The guide rod 810 can drive the pull rod 89 to move upward along the trajectory of the second hole 88. Because the width of the cover plate 101 is greater than the width of the third hole 102, the cover plate 101 can block the third hole 102. The upper surface of the pull plate 85 is in a sealed state, which makes the space between the pull plate 85 and the first baffle 104 larger. At this time, the space between the pull plate 85 and the first baffle 104 becomes negative pressure, which pushes the gas connected to the lower end of the first connecting pipe 84 to the upper end of the first connecting pipe 84. Because the lower end of the first connecting pipe 84 is connected to the lower end of the protective sleeve 81, it sucks away the loose floating dust accumulated on the temperature measuring contact surface at the bottom of the external sensor 7, reduces the influence of impurities on the external sensor 7, and allows the external sensor 7 to provide more accurate data to the control board 6, provide more accurate speed to the fan 5, and perform more reasonable cooling.

[0038] The negative pressure cleaning function of this device primarily targets loose dust rather than firmly deposited oil stains. For solidified oil stains, the cleaning effect of this device is limited, but it can be used in conjunction with chemical cleaning agents. The degree of improvement in temperature measurement accuracy depends on the initial accumulation of contaminants at the bottom of the sensor. For motors that have not been cleaned for a long time, the contaminant accumulation layer can reach 0.1-0.5mm thick, forming a significant heat insulation layer and causing a temperature measurement deviation of 5-15℃. This device, through periodic negative pressure cleaning, can reduce the temperature measurement deviation to within ±1-2℃. Although this improvement does not significantly change the fan's on / off control logic, for continuous control systems such as PID speed regulation, the improved temperature measurement accuracy directly affects the tuning accuracy of control parameters and system stability.

[0039] A pushing mechanism 10 is provided inside the pulling mechanism 8. The pushing mechanism 10 includes a cover plate 101 vertically slidably connected to the upper surface of the pull plate 85, a third hole 102 provided inside the pull plate 85, a first baffle 104 fixedly connected to the inner side of the upper end of the protective sleeve 81, and a second air pipe 105 connected to the outer side of the upper end of the protective sleeve 81 and connected to the inner side of the first baffle 104. When the pull plate 85 moves upward, it pushes the gas above the pull plate 85 to move to the inner side of the second air pipe 105. Since the second air pipe 105 is connected to the inner side of the first baffle 104 at the other end of the upper outer side of the protective sleeve 81, the gas in the second air pipe 105 moves to the bottom of the first baffle 104.

[0040] The width of the cover plate 101 is greater than the width of the third hole 102. It is used to close the third hole 102 to form a negative pressure when the pull plate 85 moves upward, and to be pushed open by the gas when the pull plate 85 moves downward to allow the gas to pass through.

[0041] Both the first connecting pipe 84 and the filter screen 11 are located inside the motor housing 1, where the conditions for direct natural convection heat exchange with the outside air are limited. The first connecting pipe 84 is made of copper tube with good thermal conductivity (thermal conductivity of about 400W / (m·K)). A section of it close to the inner wall of the motor housing 1 (about 50-100mm in length) is tightly bonded to the inner wall of the motor housing 1 with thermally conductive silicone grease. The large surface area of ​​the motor housing 1 itself dissipates heat to the outside environment, thereby reducing the temperature of the gas flowing through the pipe.

[0042] The filter screen 11 is also a metal mesh structure, which can partially transfer heat to the metal wall of the protective sleeve 81 for heat dissipation through thermal conduction.

[0043] An air gap is reserved between the outer wall of the protective sleeve 81 and the inner wall of the motor housing 1 to form a heat insulation layer, reducing the direct heat radiation from the high temperature of the bearing 2 to the inside of the protective sleeve 81.

[0044] The heat exchange in this device mainly refers to the transfer of heat from the gas to the motor housing 1 and the external environment through the metal wall as the gas flows through the pipes and filter, rather than forced convection heat exchange with the outside air. Therefore, the cooling effect is auxiliary, and the reduction in gas temperature is limited, but sufficient to prevent high-temperature gas from directly damaging the sensor's temperature measuring element. Those skilled in the art can choose whether to add an external heat dissipation structure (such as extending the filter to the outside of the motor) to enhance the cooling effect based on the actual operating conditions.

[0045] A filter screen 11, fixedly connected to the first baffle 104, is installed at the upper inlet of the first connecting pipe 84. This filter screen 11 filters impurities and exchanges heat with the air outside the protective sleeve 81 as the gas flows through, ensuring the gas reaching the top of the protective sleeve 81 is clean and cooler. When the large circle of the guide groove 87 re-engages with the guide rod 810, the guide groove 87 pushes the guide rod 810 downwards, causing the pull rod 89 and pull plate 85 to move downwards. Since the gas cannot be compressed at this time, it pushes open the cover plate 101 and moves upwards to above the pull plate 85. The gas below the pull plate 85 passes through the first connecting pipe 84 and the filter screen 11, causing heat exchange between the gas and the pipe wall as it flows through the pipe. The pipe wall then conducts the heat to the motor housing, from which heat is dissipated to the external environment. Furthermore, during heat exchange, the gas moves away from the bearing 2, thus... The gas reaching the top of the protective sleeve 81 is at a lower temperature than the inner side of the lower end of the protective sleeve 81, and the gas has passed through the filter screen 11, making the gas low-temperature and with fewer impurities. Due to the above process, this gas will move to the bottom of the external sensor 7 when cleaning some of the impurities accumulated on the temperature measuring contact surface at the bottom of the external sensor 7 next time. Clean low-temperature gas is selected when cleaning impurities at the bottom of the external sensor 7 under negative pressure. On the one hand, clean gas can avoid the introduction of new dust and oil during the blowing process, which will cause secondary dirt accumulation, and can also prevent hard particles from scratching the temperature measuring contact surface. On the other hand, the low-temperature gas will cause the solidified dirt to crack and fall off due to the difference in thermal expansion and contraction between the probe, the housing and the scale layer, while avoiding high temperature damage to the temperature measuring element and the intermediate thermal grease, ensuring the descaling effect and the stable temperature measuring performance of the external sensor 7, reducing damage to the external sensor 7 and making the cleaning effect better.

[0046] Meanwhile, during the negative pressure cleaning process, the gas inside the protective sleeve 81 is re-filtered and cooled, reducing the damage of high-temperature gas to the external sensor 7.

[0047] The pushing mechanism 10 also includes a second baffle 106 rotatably connected to the inner side of the lower part of the protective sleeve 81; the external sensor 7 is nested inside the second baffle 106, and the interior of the second baffle 106 is provided with a vent hole 107.

[0048] The second baffle 106 rotates when airflow passes through, causing the vent 107 to generate a rotating airflow. When the clean, low-temperature gas moves downward, it will move through the vent 107. Since the vent 107 is equidistantly distributed on the inner side of the second baffle 106, and the central axis of the vent 107 is inclined to the central axis of the external sensor 7, when the gas enters the vent 107, the airflow drills into the inclined hole, and the airflow is forced to change direction and bend. The reaction force pushes the turntable to rotate, so that when the clean, low-temperature gas comes into contact with the temperature measuring contact surface at the bottom of the external sensor 7, it is rotating gas, which can generate a rotating shearing force, making it easier for impurities to fall off and be adsorbed and carried away.

[0049] Vent holes 107 are equidistantly distributed around the inner side of the second baffle 106, and the central axis of the vent holes 107 is inclined to the central axis of the external sensor 7. Due to the low-frequency strong vibration of the torque motor, even with the external sensor 7 connected by threads, the small reciprocating vibration of the bearing housing will cause the external sensor 7 to tilt and compact on one side, forming a wedge-shaped gap. Because the rotating airflow flows around the external sensor 7 in a 360° circle, the static pressure of the gas around the outer circumference of the external sensor 7 is basically equal. The gap on the tilted side is larger, the airflow cross-sectional area is larger, the local flow velocity is higher, and the static pressure is lower; the gap on the compacted side is narrower, the flow velocity is slower, and the static pressure is higher. The circumferential pressure difference spontaneously forms a resetting thrust pointing towards the center, continuously pushing the tilted part of the external sensor 7 back to the mating surface.

[0050] During negative pressure cleaning, the protective sleeve 81 maintains a constant micro-negative pressure, and a uniform micro-negative pressure is formed in the inner cavity of the protective sleeve 81. This applies a downward and uniform adsorption pull to the external sensor 7 as a whole. The raised edge, which was originally lifted by local air pressure, is slowly pushed back down by the downward negative pressure combined with the reset side thrust of the circumferential swirling flow. The compacted side will not be excessively pulled and sunken by the negative pressure.

[0051] The two are coupled to form a dynamic self-balancing system. The swirling flow is responsible for circumferential lateral correction and alignment, while the negative pressure is responsible for uniform downward pressure and limiting. The continuous dynamic correction through one surrounding and one pulling allows the external sensor 7 to better contact the outside of the bearing 2.

[0052] The external sensor 7 is bolted to the protective sleeve 81. When replacement is needed, the protective sleeve 81 can be removed as a whole before the external sensor 7 can be disassembled, making disassembly and assembly convenient. When the external sensor 7 needs to be replaced, the bolts fixing the protective sleeve 81 are removed, the protective sleeve 81 is taken out as a whole, and then the bolts fixing the external sensor 7 are removed from the protective sleeve 81. The disassembly and assembly process is convenient.

[0053] The frequency of the up-and-down movement of the pull plate 85 is determined by the rotation frequency of the rotating shaft 3. The frequency of the up-and-down movement of the pull plate 85 determines the cleaning frequency of the temperature measuring contact surface at the bottom of the external sensor 7. The rotation frequency of the motor determines the speed of impurity accumulation, which also determines the frequency of the up-and-down movement of the pull plate. This allows the faster the accumulation speed, the faster the cleaning speed, and it can automatically adapt and adjust.

[0054] The term "comprising" is used to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between those entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A motor with active heat dissipation regulation function, comprising a motor housing (1), a bearing (2) disposed inside the motor housing (1), a rotating shaft (3) disposed inside the bearing (2), a base (4) fixedly connected to the lower end of the motor housing (1), a fan (5) fixedly connected to one side of the base (4), a control board (6) fixedly connected to one side of the fan (5), and an external sensor (7) electrically connected to the control board (6), characterized in that, The motor housing (1) is provided with a pulling mechanism (8); The pulling mechanism (8) includes a protective sleeve (81) disposed in the first hole (9) inside the motor housing (1), a first connecting pipe (84) connected to the upper end of the protective sleeve (81), and a pull plate (85) disposed on the inner side of the upper end of the protective sleeve (81). The pulling mechanism (8) is used to drive the pull plate (85) to move up and down when the rotating shaft (3) rotates, forming a negative pressure above the pull plate (85) to suck away the impurities accumulated on the temperature measuring contact surface at the bottom of the external sensor (7).

2. The motor with active heat dissipation regulation function according to claim 1, characterized in that, The protective sleeve (81) is bolted to the motor housing (1). The lower end of the protective sleeve (81) is a rubber sleeve (82) used to keep the temperature measuring contact surface sealed during vibration. The outer side of the pull plate (85) is in contact with the inner side of the upper end of the protective sleeve (81).

3. A motor with active heat dissipation regulation function according to claim 1, characterized in that, The pulling mechanism (8) further includes a rotating plate (86) fixedly connected to the outside of the rotating shaft (3), a guide groove (87) provided on the inside of the rotating plate (86), a second hole (88) provided inside the upper end of the protective sleeve (81), a pull rod (89) provided on the inside of the second hole (88) and fixedly connected to the pull plate (85), and a guide rod (810) provided on the inside of the guide groove (87) and fixedly connected to the pull rod (89).

4. A motor with active heat dissipation regulation function according to claim 3, characterized in that, The guide groove (87) is composed of two arc grooves facing opposite directions connected end to end, and is in clearance fit with the guide rod (810) to drive the guide rod (810) and the pull rod (89) to move up and down reciprocally when the rotating shaft (3) rotates.

5. A motor with active heat dissipation regulation function according to claim 1, characterized in that, The inner side of the pulling mechanism (8) is provided with a pushing mechanism (10). The pushing mechanism (10) includes a cover plate (101) vertically slidably connected to the upper surface of the pull plate (85), a third hole (102) provided on the inner side of the pull plate (85), a first baffle (104) fixedly connected to the inner side of the upper end of the protective sleeve (81), and a second air pipe (105) connected to the outer side of the upper end of the protective sleeve (81) and connected to the inner side of the first baffle (104). The width of the cover plate (101) is greater than the width of the third hole (102), and is used to close the third hole (102) to form a negative pressure when the pull plate (85) moves upward, and is pushed open by the gas when the pull plate (85) moves downward to allow the gas to pass through.

6. A motor with active heat dissipation regulation function according to claim 5, characterized in that, A filter screen (11) is fixedly connected to the first baffle (104) at the upper inlet of the first connecting pipe (84) to filter impurities and exchange heat with the air outside the protective sleeve (81) when the gas flows through, so that the gas reaching the top of the protective sleeve (81) is clean and the temperature is reduced.

7. A motor with active heat dissipation regulation function according to claim 5, characterized in that, The pushing mechanism (10) also includes a second baffle (106) rotatably connected to the inner side below the protective sleeve (81); the external sensor (7) is nested inside the second baffle (106), and the interior of the second baffle (106) is provided with a vent hole (107). The second baffle (106) is used to rotate when the airflow passes through, thereby driving the vent (107) to generate a rotating airflow.

8. A motor with active heat dissipation regulation function according to claim 7, characterized in that, The vents (107) are circumferentially distributed on the inner side of the second baffle (106), and the central axis of the vents (107) is inclined to the central axis of the external sensor (7). This is used to generate a rotational shear force to strip away impurities from the flowing gas and to form a circumferential pressure difference around the external sensor (7) to generate a correction and reset force.

9. A motor with active heat dissipation regulation function according to claim 7, characterized in that, The external sensor (7) is bolted to the protective sleeve (81), so that when replacement is needed, the protective sleeve (81) can be taken out as a whole and then the external sensor (7) can be disassembled to achieve convenient disassembly and assembly.

10. A motor with active heat dissipation regulation function according to claim 1, characterized in that, The frequency of the up-and-down movement of the pull plate (85) is determined by the rotation frequency of the rotating shaft (3), which is used to make the cleaning frequency adaptively match the impurity accumulation speed.

Images