Energy-saving motor with overload protection function

Abstract

The present application relates to overload protection technical field, specifically to a kind of energy-saving motor with overload protection function, including shell, stator and rotor being located in shell, zigzag-shaped heat dissipation flow passage is opened in shell interior around stator, the device box with baffle is fixed on the outside of shell, baffle separates into element chamber and flow-through chamber in box, element chamber is equipped with power-off element in series with motor power supply circuit, heat dissipation flow passage and flow-through chamber are communicated through extension section between shell and device box, centrifugal wheel driven by rotor is equipped in power pipe, cooperate with the temperature bag type flow direction switch in tee pipe, the adaptive switching of small cycle and large cycle can be realized;While tail cover is equipped with dust cleaning assembly driven by temperature sensing strip, can automatically switch cleaning mode to air exchange groove or circulating pipe with temperature change, the present application does not need additional electronic water pump, cooling system energy consumption is low, with efficient heat dissipation, adaptive overload protection and anti-blocking function, adapt to the low auxiliary energy consumption demand of high-efficiency energy-saving industry.

Description

Technical Field

[0001] This invention relates to the field of overload protection technology, specifically to an energy-saving motor with overload protection function. Background Technology

[0002] Electric motors are the core power components that account for the largest share of electricity consumption in energy-efficient industries. Promoting energy-saving electric motors is a key approach to reducing carbon emissions and electricity consumption in the industrial sector.

[0003] While current energy-saving motor reviews focus on IE3 / IE4 energy efficiency ratings, shortcomings remain in auxiliary energy consumption: First, liquid-cooled energy-saving motors generally use external electric water pumps to drive the coolant, with the electric water pumps consuming 5% to 10% of the motor's total power consumption, violating the energy-saving principle of "low auxiliary energy consumption"; Second, conventional overload protection relies on current-sampling thermal relays, which have a delayed response and cannot dynamically adjust the heat dissipation intensity based on liquid temperature, easily triggering shutdown due to insufficient heat dissipation in the early stages of overload, thus shortening the high-efficiency operating range of energy-saving motors. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving motor with overload protection function to solve the problem that the existing technology cannot dynamically adjust the heat dissipation intensity according to the liquid temperature, and is prone to triggering shutdown due to insufficient heat dissipation in the early stage of overload, thus shortening the high-efficiency operating range of the energy-saving motor.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An energy-saving motor with overload protection includes a housing, a stator and a rotor disposed within the housing. A heat dissipation channel is provided inside the housing. A device box is fixedly installed on the housing, and a partition is fixedly installed inside the device box, dividing the interior of the device box into a component chamber and a circulation chamber. A power-off element is installed in the component chamber and is electrically connected to the motor's terminals. An extension section and a power pipe are connected between the housing and the device box. The extension section connects the outlet of the heat dissipation channel to the interior of the circulation chamber. One end of the power pipe is connected to the interior of the circulation chamber, and the other end is connected to a return pipe and a circulation pipe via a T-junction. A flow direction switching component is installed inside the T-junction, and the flow direction switching component has a first opening and a second opening, which are respectively connected to the circulation pipe and the return pipe.

[0007] Preferably, the inner cavity of the power pipe extending to one side of the rotor is vortex-shaped to form a centrifugal pump chamber. A fan is installed on the rotor, and the fan has a hub. The hub is fixed to the outer circle of the rotor shaft by a key connection. A centrifugal wheel is coaxially arranged inside the centrifugal pump chamber. The inner hole of the centrifugal wheel is fixed to the outer circle of the rotor shaft by a key connection. The centrifugal wheel rotates synchronously with the rotor. A mouth ring seal is provided between the centrifugal wheel and the inner wall of the centrifugal pump chamber.

[0008] Preferably, the heat dissipation channel includes multiple longitudinal channels arranged at intervals along the axial direction of the housing and a transverse connecting channel connecting two adjacent longitudinal channels. The multiple longitudinal channels are distributed in a circumferential array within the housing and surround the stator. The ends of two adjacent longitudinal channels are connected end to end through the transverse connecting channel, so that the heat dissipation channel extends in a continuous zigzag shape.

[0009] Preferably, the flow direction switching component includes a first fixing plate and a second fixing plate fixedly installed inside the tee pipe. The first fixing plate and the second fixing plate are coaxially arranged. A first retainer is fixedly installed on the side of the first fixing plate near the second fixing plate. A temperature bulb is slidably installed in the first retainer. A first baffle is fixedly installed on the temperature bulb. The first baffle is used to block the first fixing plate. A second baffle is also fitted on the temperature bulb. The second baffle is used to block the second fixing plate.

[0010] Preferably, the temperature sensor includes a circular shell, the open end of which is sealed with an end cap. A phase change material, a rubber tube, and a piston are sequentially arranged inside the circular shell. The piston passes through the end cap. A second mounting bracket is fixedly installed on the side of the first fixing plate opposite to the first mounting bracket. One end of the piston outside the circular shell abuts against the second mounting bracket. A first spring is fitted onto the circular shell, with both ends abutting against a first baffle and the first mounting bracket, respectively. The end of the circular shell opposite to the end cap has an extension portion. A second baffle is installed on the extension portion, and a second spring is fitted onto the extension portion. Both ends of the second spring abut against the circular shell and the second baffle, respectively.

[0011] Preferably, a limiting plate is fixedly installed at the end of the extension away from the circular shell, and a sealing sheet is fixedly connected between the outer circumference of the limiting plate and the inner ring of the second baffle.

[0012] Preferably, a tail cover is bolted to the housing, and a ventilation groove is provided on the tail cover. A dust removal assembly is slidably mounted radially on the inner wall of the tail cover. The dust removal assembly includes a slide rod and a brush rod mounted on the slide rod. The connection between the tail cover and the slide rod forms an outwardly extending enclosure structure. The slide rod is mounted in the enclosure structure by an elastic element. The end of the slide rod near the rotor is coaxially mounted in the hub and connected to the hub by a key.

[0013] Preferably, a temperature sensing plate is fixedly installed on one end face of the rotor output shaft located inside the hub. The temperature sensing plate has a bendable metal tongue, which is fixedly connected to the slide rod.

[0014] Preferably, the elastic element includes a rotating ring rotatably mounted within the enclosure structure, and a tension spring is fixedly connected between the rotating ring and the slide rod.

[0015] Preferably, the partition includes a substrate and a metal heat-conducting plate attached to the side of the substrate facing the flow chamber, with an assembly gap reserved between the metal heat-conducting plate and the substrate; the power-off element includes a rating unit and a power-off piece, the rating unit is installed in the element chamber, the rating unit and the power-off piece are electrically connected through a contactor, the power-off piece is connected in series in the power supply circuit of the motor, the power-off piece is embedded in the assembly gap between the metal heat-conducting plate and the substrate, and the temperature-sensing surface of the power-off piece is thermally bonded to the metal heat-conducting plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The cooling cycle is completed by the direct-drive centrifugal wheel and fan connected by the rotor shaft via a key. The energy-saving motor does not require an external electric water pump, eliminating 5% to 10% of the pumping self-consumption. The closed-loop zigzag flow channel extends the residence time and reduces the conveying resistance, further reducing auxiliary energy consumption and directly responding to the low auxiliary energy consumption index of the high-efficiency energy-saving industry.

[0018] 2. The phase change drive flow direction switching component of the temperature bulb adaptively switches between the small circulation of the return pipe and the large circulation of the circulation pipe: under normal operating conditions, it runs in the small circulation to save power, and during the overload temperature rise period, it runs in the large circulation to enhance heat dissipation, so that the energy-saving motor can maintain efficient operation in a wide load range, avoid premature shutdown or overheating and burnout, and expand the high-efficiency zone bandwidth of the IE energy efficiency curve.

[0019] 3. The power-off plate is thermally bonded to the metal heat-conducting plate. When the temperature rise exceeds the limit, the bimetallic circuit is tripped and the rated device is electrically cut off by the contactor, forming a double protection. The metal tongue of the tail cover temperature sensor pushes and pulls the dust removal component with the shaft temperature. The small circulation sweeps the air exchange groove and the large circulation scrapes the outer wall of the circulation pipe, ensuring the heat exchange efficiency of the energy-saving motor throughout its entire life cycle and reducing the hidden energy loss caused by downtime maintenance. Overall, it meets the requirements of the high-efficiency mechanical energy-saving industry for highly reliable energy-saving power. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the tail cap-less structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the tail cap-less and fan-shaped structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the housing and stator structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of the casing of the present invention;

[0025] Figure 6 This is a schematic diagram of the power pipe structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the internal structure of the device box of the present invention;

[0027] Figure 8 This is a schematic diagram of the flow direction switching component structure of the present invention;

[0028] Figure 9 This is a schematic diagram of the temperature-controlled bulb structure of the present invention;

[0029] Figure 10 This is a schematic diagram of the internal structure of the thermometer of the present invention;

[0030] Figure 11 This is a schematic diagram of the dust removal component structure of the present invention.

[0031] In the attached diagram, the components represented by each number are as follows:

[0032] 10. Housing; 11. Heat dissipation channel; 111. Longitudinal channel; 112. Transverse connecting channel; 12. Extension section; 13. Power pipe; 131. Centrifugal pump chamber; 132. Centrifugal impeller; 133. O-ring seal; 14. T-pipe; 15. Return pipe; 16. Circulation pipe; 17. Tail cover; 171. Ventilation slot; 172. Enclosure structure;

[0033] 20. Stator;

[0034] 30. Rotor; 31. Temperature sensing element; 311. Metal tongue;

[0035] 40. Device box; 41. Partition; 401. Component chamber; 402. Flow chamber; 411. Substrate; 412. Metal heat-conducting plate;

[0036] 50. Power-off element; 51. Rating device; 52. Power-off switch; 53. Contactor;

[0037] 60. Flow direction switching component; 61. First opening; 62. Second opening; 63. First fixing plate; 64. Second fixing plate; 65. First retaining seat; 66. Temperature bulb; 661. Round shell; 662. End cap; 663. First spring; 601. Phase change material; 602. Rubber tube; 603. Piston; 604. Extension; 605. Second spring; 606. Limiting plate; 607. Sealing plate; 67. First baffle; 68. Second baffle; 69. Second retaining seat;

[0038] 70. Fan; 71. Wheel hub;

[0039] 80. Dust removal assembly; 81. Slide rod; 82. Brush rod; 83. Elastic element; 831. Rotary ring; 832. Tension spring. Detailed Implementation

[0040] 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.

[0041] Example 1: The present invention provides a technical solution: such as Figure 1 - Figure 11 The energy-saving motor with overload protection function shown includes a housing 10, a stator 20 and a rotor 30 disposed inside the housing 10. A heat dissipation channel 11 is provided inside the housing 10. A device box 40 is fixedly installed on the housing 10. A partition 41 is fixedly installed inside the device box 40. The partition 41 divides the inside of the device box 40 into a component chamber 401 and a circulation chamber 402. A power-off element 50 is installed in the component chamber 401. The power-off element 50 is electrically connected to the motor's wiring terminals and is used to perform overload protection.

[0042] The partition 41 adopts a composite structure, including a substrate 411 and a metal heat-conducting plate 412 attached to the side of the substrate 411 facing the flow chamber 402. An assembly gap is reserved between the metal heat-conducting plate 412 and the substrate 411.

[0043] The power-off element 50 includes a rating unit 51 and a power-off element 52. The rating unit 51 is a current relay installed in the element chamber 401 and is used to set the action threshold. The rating unit 51 and the power-off element 52 are electrically connected through a contactor 53, which is used to control the start and stop of the motor. It is worth noting that the power-off element 52 is connected in series in the power supply circuit of the motor. The power-off element 52 is embedded in the assembly gap between the metal heat-conducting plate 412 and the substrate 411, and the temperature-sensing surface of the power-off element 52 is thermally bonded to the metal heat-conducting plate 412, so that the power-off element 52 can directly sense the temperature change of the cooling medium in the circulation chamber 402 and respond quickly.

[0044] In this embodiment, the power-off piece 52 is a bimetallic sheet structure. Specifically, the power-off piece 52 is made of two alloy layers with different coefficients of thermal expansion, which are rolled together. The layer with the higher coefficient of thermal expansion is the active layer, and the layer with the lower coefficient of thermal expansion is the passive layer. The power-off piece 52 is cantilevered and embedded in the assembly gap between the metal heat-conducting plate 412 and the substrate 411. Its fixed end is pressed against the substrate 411 by a thermally conductive insulating pad, and its free end is provided with a moving contact. A stationary contact is provided at a corresponding position on the substrate 411. The moving contact and the stationary contact are connected in series in the power supply circuit of the motor.

[0045] An extension section 12 and a power pipe 13 are connected between the housing 10 and the device box 40, respectively. The extension section 12 connects the outlet of the heat dissipation channel 11 to the inside of the circulation chamber 402. One end of the power pipe 13 is connected to the inside of the circulation chamber 402, and the other end is connected to the return pipe 15 and the circulation pipe 16 through a three-way pipe 14. A flow direction switching component 60 is installed in the three-way pipe 14. The flow direction switching component 60 has a first opening 61 and a second opening 62. The first opening 61 and the second opening 62 are connected to the circulation pipe 16 and the return pipe 15, respectively, forming a closed cooling circuit.

[0046] When the energy-saving motor is running, the coolant absorbs heat in the heat dissipation channel 11 and then flows into the circulation chamber 402 of the device box 40 through the extension section 12. At this time, the heat of the coolant is quickly conducted to the power cut-off piece 52 embedded in the assembly gap through the metal heat conduction plate 412.

[0047] The assembly gap and the flow chamber 402 are completely sealed and isolated by a metal heat-conducting plate 412. The power-off piece 52 and the contact assembly are located in a dry, sealed cavity and exchange heat with the coolant only through the metal heat-conducting plate 412.

[0048] When the motor is in normal operating condition, the flow switching component 60 keeps the first opening 61 closed and the second opening 62 open. The cooled liquid after heat dissipation flows directly back to the inlet of the heat dissipation channel 11 through the return pipe 15, forming a small circulation with low resistance to reduce the energy consumption of the cooling system.

[0049] When the motor is overloaded and the temperature rises abnormally, but has not yet reached the action threshold of the power-off plate 52, the flow direction switching component 60 is activated according to the coolant temperature, causing the first opening 61 to open and the second opening 62 to close. At this time, the high-temperature coolant flowing out of the heat dissipation channel 11 is forced to change its path and enter the circulation pipe 16 through the three-way pipe 14. After the coolant fully releases heat in the circulation pipe 16, it flows back to the inlet of the heat dissipation channel 11, forming a larger circulation with stronger heat dissipation capacity.

[0050] If the large-circuit heat dissipation still cannot suppress the temperature rise, the thermal stress accumulated in the power-off plate 52 exceeds its elastic stability critical value, and a sudden elastic deformation is generated instantaneously, causing the moving contact to separate from the stationary contact, directly physically cutting off the main power supply circuit; at the same time, the rated device 51 triggers the contactor 53 to cut off the circuit, forming a dual protection of hardware and electronic control, which effectively improves the operating efficiency of the motor under non-rated conditions, in line with the core orientation of reducing auxiliary energy consumption in the high-efficiency energy-saving industry.

[0051] Reference Figure 6 The power pipe 13 extends into the inner cavity of one side of the rotor 30 in a vortex shape to form a centrifugal pump chamber 131. A fan 70 is installed on the rotor 30. The fan 70 has a hub 71, which is fixed to the outer circle of the rotor 30 shaft by a key connection and is directly driven to rotate by the rotor 30.

[0052] A centrifugal wheel 132 is coaxially arranged inside the centrifugal pump chamber 131. The inner hole of the centrifugal wheel 132 is fixed to the outer circle of the rotor 30 shaft by a key connection. The centrifugal wheel 132 rotates synchronously with the rotor 30. Thus, the centrifugal wheel 132 and the fan 70 are fixedly connected to the same shaft section of the rotor 30 and maintain synchronous rotation. A mouth ring seal 133 is provided between the centrifugal wheel 132 and the inner wall of the centrifugal pump chamber 131 to effectively prevent coolant from leaking into the motor and ensure a dry environment for the rotor 30 and stator 20.

[0053] Reference Figure 5 The heat dissipation channel 11 includes multiple longitudinal channels 111 arranged at intervals along the axial direction of the housing 10 and a transverse connecting channel 112 connecting two adjacent longitudinal channels 111. The multiple longitudinal channels 111 are distributed in a circumferential array within the housing 10 and surround the stator 20 to maximize the heat exchange area. The ends of two adjacent longitudinal channels 111 are connected end to end through the transverse connecting channel 112, so that the heat dissipation channel 11 extends in a continuous zigzag shape.

[0054] After the energy-saving motor is powered on, the rotor 30 rotates, which synchronously drives the fan 70 and the centrifugal wheel 132 in the centrifugal pump chamber 131 to rotate. The rotation of the centrifugal wheel 132 generates centrifugal pressure, which draws the coolant from one end of the centrifugal pump chamber 131 and throws it radially to the outer edge of the pump chamber. Under the pressure drive, the coolant first enters the heat dissipation channel 11 in the housing 10. Since the heat dissipation channel 11 is distributed in a "zigzag" shape, the coolant is forced to flow back and forth along multiple longitudinal channels 111, which greatly prolongs the residence time of the coolant in the housing 10 and ensures that the coolant can flow through the entire circumferential surface of the stator 20, thereby efficiently removing the Joule heat and iron loss heat generated by the stator 20 core and winding.

[0055] After absorbing heat and heating up, the coolant flows into the flow chamber 402 of the device box 40 through the extension section 12. At the same time, the flow direction switching component 60 selects the return path according to the working conditions. If it is in the small circulation, the coolant returns directly to the inlet of the centrifugal pump chamber 131 through the return pipe 15. If it is in the large circulation, the coolant dissipates heat through the circulation pipe 16 and then returns. The fan 70 rotates with the shaft, and the forced airflow generated by it continuously blows the circulation pipe 16, accelerating the heat dissipation of the coolant.

[0056] The entire cooling cycle is driven by the mechanical rotation of the rotor 30, eliminating the need for an additional electric water pump and reducing the overall energy consumption of the motor. At the same time, the zigzag heat dissipation channel 11 combined with the high-efficiency centrifugal pump chamber 131 further reduces fluid transport resistance while ensuring heat dissipation efficiency, meeting the dual requirements of low auxiliary energy consumption and high heat dissipation efficiency for energy-saving motors in the high-efficiency energy-saving industry.

[0057] Reference Figure 8 , Figure 9 and Figure 10 The flow direction switching component 60 includes a first fixing plate 63 and a second fixing plate 64 fixedly installed inside the tee pipe 14. The first fixing plate 63 and the second fixing plate 64 are coaxially spaced apart. A first retainer 65 is fixedly installed on the side of the first fixing plate 63 near the second fixing plate 64. A temperature bulb 66 is slidably installed in the first retainer 65. A first baffle 67 is fixedly installed on the temperature bulb 66. The first baffle 67 is used to block the first fixing plate 63. A second baffle 68 is also fitted on the temperature bulb 66. The second baffle 68 is used to block the second fixing plate 64.

[0058] Specifically, the temperature bulb 66 includes a circular shell 661, with an end cap 662 sealing the open end of the circular shell 661. A phase change material 601, a rubber tube 602, and a piston 603 are sequentially arranged inside the circular shell 661. The piston 603 passes through the end cap 662 and can slide axially. A second retainer 69 is fixedly installed on the side of the first fixing plate 63 opposite to the first retainer 65. One end of the piston 603 located outside the circular shell 661 abuts against the second retainer 69, thereby limiting the axial displacement limit of the piston 603. A first spring 663 is sleeved on the circular shell 661. The two ends of the first spring 663 abut against the first baffle 67 and the first retainer 65, respectively. The first spring 663 provides a preload force, causing the first baffle 67 to press against the first fixing plate 63 to achieve a seal.

[0059] The circular shell 661 has an extension 604 at one end away from the end cover 662. A second baffle 68 is mounted on the extension 604. A second spring 605 is sleeved on the extension 604. The two ends of the second spring 605 abut against the circular shell 661 and the second baffle 68 respectively. The second spring 605 provides a preload force to cause the second baffle 68 to press against the second fixing plate 64 to achieve a seal.

[0060] Furthermore, a limiting plate 606 is fixedly installed at the end of the extension 604 away from the circular shell 661. A sealing sheet 607 is fixedly connected between the outer circumference of the limiting plate 606 and the inner ring of the second baffle 68. The sealing sheet 607 wrinkles and deforms as the temperature bulb 66 moves axially, which is used to close the annular gap between the second baffle 68 and the extension 604, and plays an adaptive floating effect, reducing the hard contact between the second baffle 68 and the second fixed plate 64.

[0061] In the small circulation mode, the coolant temperature is within the normal operating range, the phase change material 601 inside the temperature bulb 66 shrinks in volume, and the piston 603 remains in place under the limit of the second retainer 69. At this time, the first spring 663 is in a stretched state, the first baffle 67 tightly seals the first opening 61 on the first fixed plate 63, the first flow hole connects to the path of the return pipe 15, while the second spring 605 is in a compressed state, and the second opening 62 is in a conductive state, forming a small circulation with less resistance.

[0062] When the motor is overloaded, causing the coolant temperature to rise and exceed the set threshold, the phase change material 601 inside the temperature bulb 66 expands rapidly due to heat, increasing its volume. The expanded phase change material 601 squeezes the rubber tube 602, pushing the piston 603 outward along the axial direction. Since the outer end of the piston 603 is limited and blocked by the second retainer 69, the reaction force pushes the entire round shell 661 to move towards the second fixed plate 64. At this time, the second spring 605 is in a stretched state, the second baffle 68 presses the second fixed plate 64 to achieve a seal, and the first flow hole is in a conductive state, opening the path to the return pipe 15.

[0063] When the motor load decreases and the coolant temperature drops below the threshold, the phase change material 601 inside the temperature bulb 66 contracts upon cooling, reducing its volume. The piston 603 loses its support and moves axially back under the restoring force of the first spring 663 and the second spring 605, causing the first baffle 67 and the second baffle 68 to reset, cutting off the large circulation path and restoring the small circulation mode.

[0064] It should be noted that the pipe flowing from the circulation pipe 16 towards the motor eventually merges with the return pipe 15, and a one-way valve is installed at the merging point.

[0065] Example 2:

[0066] A tail cover 17 is bolted to the housing 10. A ventilation slot 171 is provided on the tail cover 17. A dust removal assembly 80 is slidably installed on the inner wall of the tail cover 17 along the radial direction.

[0067] Specifically, refer to Figure 11 The dust removal assembly 80 includes a slide rod 81 and a brush rod 82 mounted on the slide rod 81. The connection between the tail cap 17 and the slide rod 81 forms an outwardly extending enclosure structure 172. The slide rod 81 is mounted in the enclosure structure 172 by an elastic member 83. The end of the slide rod 81 near the rotor 30 is coaxially mounted in the hub 71 and connected to the hub 71 by a key.

[0068] A temperature sensing plate 31 is fixedly installed on one end face of the output shaft of the rotor 30 inside the hub 71. The temperature sensing plate 31 is made of two alloys with significantly different coefficients of thermal expansion. Its free end extends to form a bendable metal tongue 311. The metal tongue 311 is fixedly connected to the slide rod 81, thereby transmitting the deformation displacement of the temperature sensing plate 31 to the slide rod 81.

[0069] The elastic element 83 includes a rotating ring 831 rotatably mounted within the enclosure structure 172. A tension spring 832 is fixedly connected between the rotating ring 831 and the slide rod 81. The tension spring 832 always applies a retraction force toward the center of the enclosure structure 172 to the slide rod 81.

[0070] When the motor is in a small circulation state, the ambient temperature of the temperature sensing plate 31 is low and no thermal deformation occurs. Its metal tongue 311 remains in its initial bent state. At this time, under the action of the retraction force of the tension spring 832, the slide rod 81 is pulled to the radially inner position, which drives the brush rod 82 to approach the inner wall of the tail cover 17. As the rotor 30 rotates, the slide rod 81 rotates synchronously with the hub 71, thereby driving the brush rod 82 to move circumferentially along the inner wall of the tail cover 17, continuously cleaning the ventilation groove 171 opened on the tail cover 17, preventing lint or dust from accumulating in the ventilation groove 171 and blocking the air duct, and ensuring smooth ventilation under small circulation conditions.

[0071] When the motor enters the large circulation mode, the temperature of the rotor 30 shaft system rises significantly. The heat is rapidly conducted through the rotor 30 shaft end to the temperature sensing plate 31 fixedly installed on the shaft. After being heated, the temperature sensing plate 31 undergoes bending deformation towards the passive layer due to the difference in thermal expansion coefficients between the two metal layers. The metal tongue 311 at its free end pulls the slide rod 81 to overcome the preload of the tension spring 832 and slides radially outward. The slide rod 81 drives the brush rod 82 to move outward synchronously until the brush rod 82 is tightly attached to the outer wall of the circulation tube 16. At this time, as the brush rod 82 rotates with the rotor 30, it generates continuous circumferential relative motion with respect to the stationary outer wall of the circulation tube 16, thereby effectively scraping off the accumulated dust, oil stains, or flocculent matter attached to the tube wall, avoiding the increase in thermal resistance caused by dirt on the heat exchange surface, and ensuring the forced convection heat dissipation efficiency in the large circulation mode.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these 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.

[0073] 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. An energy-saving motor with overload protection function, comprising a housing (10), a stator (20) disposed within the housing (10), and a rotor (30), characterized in that: The housing (10) has a heat dissipation channel (11) inside. A device box (40) is fixedly installed on the housing (10). A partition (41) is fixedly installed inside the device box (40). The partition (41) divides the inside of the device box (40) into a component chamber (401) and a circulation chamber (402). A power-off element (50) is installed in the component chamber (401). The power-off element (50) is electrically connected to the wiring terminal of the motor. The housing (10) and the device box (40) are respectively connected by an extension section (12) and a power pipe (13). The extension section (12) connects the outlet of the heat dissipation channel (11) to the inside of the circulation chamber (402). One end of the power pipe (13) is connected to the inside of the circulation chamber (402), and the other end is connected to the return pipe (15) and the circulation pipe (16) respectively through a three-way pipe (14). A flow direction switching component (60) is installed in the three-way pipe (14). The flow direction switching component (60) has a first opening (61) and a second opening (62). The first opening (61) and the second opening (62) are respectively connected to the circulation pipe (16) and the return pipe (15).

2. An energy-saving motor with overload protection function according to claim 1, characterized in that: The power pipe (13) extends into the inner cavity of the rotor (30) in a vortex shape to form a centrifugal pump chamber (131). A fan (70) is installed on the rotor (30). The fan (70) has a hub (71). The hub (71) is fixed to the outer circle of the rotor (30) shaft by a key connection. A centrifugal wheel (132) is coaxially arranged in the centrifugal pump chamber (131). The inner hole of the centrifugal wheel (132) is fixed to the outer circle of the rotor (30) shaft by a key connection. The centrifugal wheel (132) rotates synchronously with the rotor (30). A mouth ring seal (133) is provided between the centrifugal wheel (132) and the inner wall of the centrifugal pump chamber (131).

3. An energy-saving motor with overload protection function according to claim 1, characterized in that: The heat dissipation channel (11) includes multiple longitudinal channels (111) arranged at intervals along the axial direction of the housing (10) and a transverse connecting channel (112) connecting two adjacent longitudinal channels (111). The multiple longitudinal channels (111) are arranged in a circular array within the housing (10) and surround the stator (20). The ends of two adjacent longitudinal channels (111) are connected end to end through the transverse connecting channel (112), so that the heat dissipation channel (11) extends in a continuous zigzag shape.

4. An energy-saving motor with overload protection function according to claim 1, characterized in that: The flow direction switching component (60) includes a first fixing plate (63) and a second fixing plate (64) fixedly installed inside the three-way pipe (14). The first fixing plate (63) and the second fixing plate (64) are coaxially arranged. A first card seat (65) is fixedly installed on the side of the first fixing plate (63) close to the second fixing plate (64). A temperature bulb (66) is slidably installed inside the first card seat (65). A first baffle (67) is fixedly installed on the temperature bulb (66). The first baffle (67) is used to block the first fixing plate (63). The temperature pack (66) is also fitted with a second baffle (68), which is used to block the second fixing plate (64).

5. An energy-saving motor with overload protection function according to claim 4, characterized in that: The temperature sensor (66) includes a cylindrical shell (661), the open end of which is sealed with an end cap (662). A phase change material (601), a rubber tube (602), and a piston (603) are sequentially arranged inside the cylindrical shell (661). The piston (603) passes through the end cap (662). A second card seat (69) is fixedly installed on the side of the first fixing plate (63) away from the first card seat (65). The end of the piston (603) located outside the cylindrical shell (661) abuts against the second card seat (69). A first spring (663) is fitted on the round shell (661), and the two ends of the first spring (663) abut against the first baffle (67) and the first card seat (65) respectively. The round shell (661) has an extension (604) at one end away from the end cap (662). The second baffle (68) is mounted on the extension (604). A second spring (605) is sleeved on the extension (604). The two ends of the second spring (605) abut against the round shell (661) and the second baffle (68) respectively.

6. An energy-saving motor with overload protection function according to claim 5, characterized in that: A limiting plate (606) is fixedly installed at one end of the extension (604) away from the round shell (661), and a sealing plate (607) is fixedly connected between the outer circumference of the limiting plate (606) and the inner ring of the second baffle (68).

7. An energy-saving motor with overload protection function according to claim 2, characterized in that: A tail cover (17) is bolted to the housing (10). A ventilation groove (171) is provided on the tail cover (17). A dust removal assembly (80) is slidably installed on the inner wall of the tail cover (17) along the radial direction. The dust removal assembly (80) includes a slide rod (81) and a brush rod (82) mounted on the slide rod (81). The connection between the tail cap (17) and the slide rod (81) forms an outwardly extending enclosure structure (172). The slide rod (81) is mounted in the enclosure structure (172) by an elastic element (83). The end of the slide rod (81) near the rotor (30) is coaxially mounted in the hub (71) and connected to the hub (71) by a key.

8. An energy-saving motor with overload protection function according to claim 7, characterized in that: A temperature sensing plate (31) is fixedly installed on one end face of the rotor (30) output shaft inside the hub (71). The temperature sensing plate (31) has a bendable metal tongue (311), which is fixedly connected to the slide rod (81).

9. An energy-saving motor with overload protection function according to claim 7, characterized in that: The elastic element (83) includes a rotating ring (831) rotatably mounted within the enclosure structure (172), and a tension spring (832) is fixedly connected between the rotating ring (831) and the slide rod (81).

10. An energy-saving motor with overload protection function according to claim 1, characterized in that: The partition (41) includes a substrate (411) and a metal heat-conducting plate (412) attached to the side of the substrate (411) facing the flow chamber (402), and an assembly gap is reserved between the metal heat-conducting plate (412) and the substrate (411). The power-off element (50) includes a rating unit (51) and a power-off piece (52). The rating unit (51) is installed in the element chamber (401). The rating unit (51) and the power-off piece (52) are electrically connected through a contactor (53). The power-off piece (52) is connected in series in the power supply circuit of the motor. The power-off piece (52) is embedded in the assembly gap between the metal heat-conducting plate (412) and the substrate (411), and the temperature-sensing surface of the power-off piece (52) is thermally bonded to the metal heat-conducting plate (412).

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