Motor with good heat dissipation effect and vertical water pump applied by motor

Abstract

The invention relates to a motor with a good heat dissipation effect and a vertical water pump applying the motor, the motor comprises a motor shell, a front end cover and a rear end cover, the front end cover and the rear end cover are arranged on the motor shell, a rotating shaft is arranged in the motor shell, a rotor is arranged on the rotating shaft, a stator winding matched with the rotor is arranged in the motor shell, and the front end cover and the rear end cover are arranged on the motor shell. The interior of the motor shell is hollowed out to form a liquid cooling cavity, the liquid cooling cavity is filled with a cooling medium, the motor shell is arranged and installed in the vertical direction, the motor shell is sequentially divided into a heat absorption section, an evaporation section and a condensation section from bottom to top in the vertical direction, and the stator winding is only in contact with the heat absorption section of the motor shell. Efficient heat dissipation of the motor is achieved through gas-liquid phase change circulation of the cooling medium, a continuously-circulating motor heat dissipation system is formed, the heat dissipation mode is convenient and portable, the heat dissipation effect is good, the working efficiency of the motor can be effectively improved, the service life of the motor can be effectively prolonged, and the later maintenance cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of electric motors, and in particular to an electric motor with good heat dissipation effect and a vertical water pump using the same. Background Art

[0002] At present, electric motors generate heat during operation. This heat mainly comes from resistance heat loss, eddy current loss in the magnetic field, hysteresis loss and mechanical loss. In order to maintain the performance and life of the motor, this heat must be dissipated to the surrounding environment through effective heat dissipation methods. Common heat dissipation methods for electric motors are as follows: 1. Natural heat dissipation, which relies on natural convection or radiation to achieve heat dissipation. After the motor casing forms a temperature difference, the heat is dissipated to the surrounding environment through air conduction, convection, etc. The advantages of natural heat dissipation are simple structure, easy maintenance and low cost. However, as the power of the motor increases, the effect of natural heat dissipation is not ideal, and the cooling efficiency is low. It is usually suitable for small power motors or applications with relatively light heat loads.

[0003] 2. Forced cooling, which uses fans or other mechanical devices to increase air flow and enhance heat exchange, is a cooling method suitable for motors with higher power. The disadvantage of forced cooling is that it increases the design complexity and cost of the motor, and may also cause additional noise and power consumption.

[0004] 3. Liquid cooling: In some high-power motors and electric vehicles, the use of coolant cooling is becoming a gradually popular choice. The coolant is usually water or a solution mixed with antifreeze and water. It circulates in a specific area of ​​the motor to take away the heat. The disadvantage is that it has high requirements for the operating environment, and the manufacturing cost and subsequent maintenance cost are both high.

[0005] In view of the above-mentioned related technologies, a heat dissipation method with good heat dissipation effect and low manufacturing cost is needed. Summary of the invention

[0006] In order to achieve the effect of low subsequent maintenance costs, the present application provides an electric motor with good heat dissipation effect and a vertical water pump used therein.

[0007] The present application provides a motor with good heat dissipation effect, which adopts the following technical solution: A motor with good heat dissipation effect comprises a motor casing, and a front end cover and a rear end cover arranged on the motor casing, a rotating shaft is arranged in the motor casing, a rotor is arranged on the rotating shaft, a stator winding matched with the rotor is arranged in the motor casing, the motor casing is hollowed out to form a liquid cooling cavity, the liquid cooling cavity is filled with a cooling medium, the motor casing is arranged and installed in a vertical direction, and the motor casing is divided into a heat absorption section, an evaporation section and a condensation section from bottom to top in the vertical direction, and the stator winding is only in contact with the heat absorption section of the motor casing.

[0008] Preferably, the motor housing comprises an outer shell and an inner shell, the outer shell is covered on the outside of the inner shell, the liquid cooling cavity is formed between the outer shell and the inner shell, and sealing rings for sealing the liquid cooling cavity are provided at both ends of the outer shell and the inner shell.

[0009] Preferably, the outer ring edge of the sealing ring is connected to the outer shell by welding, and the inner ring edge of the sealing ring is connected to the inner shell by welding.

[0010] Preferably, a plurality of reinforcing ribs are arranged at intervals along the circumferential direction in the liquid cooling cavity, a flow cavity is formed between adjacent reinforcing ribs, and a flow port is arranged at the lower end of each reinforcing rib, through which adjacent flow cavities are connected.

[0011] Preferably, an injection hole is provided on the sealing ring at the upper end of the motor housing, and a one-way check valve is detachably mounted on the injection hole, and negative pressure is pumped into the liquid cooling chamber through the one-way check valve to keep the liquid cooling chamber in a negative pressure state.

[0012] Preferably, the negative pressure value of the liquid cooling chamber is maintained at 0.04±0.002Mpa.

[0013] Preferably, the one-way check valve is connected to the injection hole via threads, and the end surface of the one-way check valve is flush with the surface of the sealing ring.

[0014] Preferably, a plurality of heat dissipation ribs are arranged at intervals along the circumferential direction on the shell, and a heat dissipation cavity is hollowed out along the axial direction of the heat dissipation ribs, and the heat dissipation cavity is communicated with the liquid cooling cavity.

[0015] Preferably, a cooling fan is installed at the end of the rotating shaft, and the cooling fan is located on one side of the condensation section of the motor housing.

[0016] A vertical water pump provided in this application adopts the following technical solution: A vertical water pump comprises a pump body and an electric motor with good heat dissipation effect arranged on the pump body in a vertical direction as described in the above technical solution.

[0017] In summary, the present application includes at least one of the following beneficial technical effects: In the present application, the motor is arranged and installed in a vertical direction. For example, when the motor is used in a vertical water pump, when the stator winding of the motor generates heat due to resistance heat loss and eddy current loss in the magnetic field, the cooling medium is heated and vaporized. The vaporized cooling medium rises in the liquid cooling chamber. Due to the temperature difference between the condensation section and the heat absorption section, the cooling medium recondenses into liquid after being cooled, and flows back to the heat absorption section under the action of gravity. The present application realizes efficient heat dissipation of the motor through the gas-liquid phase change cycle of the cooling medium, and forms a continuously circulating motor heat dissipation system. This heat dissipation method is convenient and portable, has good heat dissipation effect, can effectively improve the working efficiency and service life of the motor, and has low subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the electric motor.

[0019] Figure 2 It is an exploded diagram of an electric motor.

[0020] Figure 3 It is a structural diagram of the motor casing.

[0021] Figure 4 It is a schematic diagram of the structure of the liquid cooling chamber in the motor casing.

[0022] Figure 5 It is a schematic diagram of the structure of the reinforcing ribs inside the motor casing.

[0023] Figure 6 It is a schematic diagram of the cooling medium injection state in the liquid cooling chamber.

[0024] Figure 7 It is a schematic diagram of the vacuum state in the liquid cooling chamber.

[0025] Explanation of the reference numerals: 1. Motor casing; 101. Outer casing; 102. Inner casing; 103. Sealing ring; 104. Reinforcing ribs; 105. Flow port; 106. Heat dissipation ribs; 107. Heat dissipation cavity; 2. Front cover; 3. Rear cover; 4. Mounting edge; 5. Mounting ear; 6. Screw-nut assembly; 7. Rotating shaft; 8. Rotor; 9. Stator winding; 10. Liquid cooling cavity; 11. Cooling medium; 12. Cooling fan; 13. Protective cover; 14. Injection hole; 15. One-way check valve. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-7 This application is described in further detail.

[0027] Embodiment 1 A motor with good heat dissipation effect, referring to Figure 1and Figure 2 As shown, it includes a motor housing 1, and a front end cover 2 and a rear end cover 3 arranged on the motor housing 1, and the end faces of the motor housing 1 are provided with mounting edges 4, and the front end cover 2 and the rear end cover 3 are embedded in the mounting edge 4 of the motor housing 1, wherein the edges of the front end cover 2 and the rear end cover 3 are provided with multiple mounting ears 5, and the mounting ears 5 are provided with screw and nut assemblies 6, and the front end cover 2 and the rear end cover 3 are tightened and fixed by the screw and nut assemblies 6.

[0028] The front end cover 2 and the rear end cover 3 are provided with mounting positions at the center positions, and bearings are provided in the mounting positions. A rotating shaft 7 is provided in the motor housing 1, and the rotating shaft 7 is arranged along the axial direction of the motor housing 1. The two ends of the rotating shaft 7 pass through the front end cover 2 and the rear end cover 3 respectively, and the two ends of the rotating shaft 7 are rotatably installed through bearings. A rotor 8 is provided on the rotating shaft 7, and a stator winding 9 is provided in the motor housing 1. The stator winding 9 is used to cooperate with the rotor 8. By passing current through the stator winding 9, the rotating shaft 7 is driven to rotate under the action of the magnetic field.

[0029] Reference Figure 2 , Figure 3 and Figure 4 As shown, the interior of the motor casing 1 is hollowed out to form a liquid cooling chamber 10, which is filled with a cooling medium 11. The motor casing 1 is arranged and installed in a vertical direction. The motor casing 1 is divided into a heat absorption section, an evaporation section and a condensation section from bottom to top in the vertical direction, and the stator winding 9 is only in contact with the heat absorption section of the motor casing 1.

[0030] When the stator winding 9 of the motor generates heat due to resistance heat loss and eddy current loss in the magnetic field, the cooling medium 11 is heated and vaporized. The vaporized cooling medium 11 rises in the liquid cooling chamber 10. Due to the temperature difference between the condensation section and the heat absorption section, the cooling medium 11 re-condenses into liquid after being cooled, and flows back to the heat absorption section under the action of gravity. The present application realizes efficient heat dissipation of the motor through the gas-liquid phase change cycle of the cooling medium 11, and forms a continuously circulating motor heat dissipation system. This heat dissipation method is convenient and portable, has good heat dissipation effect, can effectively improve the working efficiency and service life of the motor, and has low later maintenance costs.

[0031] Specifically, refer to Figure 4 and Figure 5 As shown, the motor housing 1 includes an outer shell 101 and an inner shell 102, the outer shell 101 is covered on the outside of the inner shell 102, the outer shell 101 and the inner shell 102 are coaxially installed, the above-mentioned liquid cooling cavity 10 is formed between the outer shell 101 and the inner shell 102, and both ends of the outer shell 101 and the inner shell 102 are provided with sealing rings 103 for sealing the liquid cooling cavity 10, and the above-mentioned installation edge 4 for installing the front cover 2 and the rear cover 3 is integrally formed on the inner shell 102.

[0032] The outer edge of the sealing ring 103 is connected to the outer shell 101 by welding, and the inner edge of the sealing ring 103 is connected to the inner shell 102 by welding. The sealing ring 103 forms a completely sealed liquid cooling chamber 10 between the outer shell 101 and the inner shell 102. Among them, a number of reinforcing ribs 104 are arranged at intervals along the circumferential direction in the liquid cooling chamber 10, and adjacent reinforcing ribs 104 divide the liquid cooling chamber 10 into flow chambers. The lower end of each reinforcing rib 104 is provided with a flow port 105, and the flow port 105 is used to connect adjacent flow chambers. The lower end of the reinforcing rib 104 here refers to the reference direction of the vertical arrangement and installation of the motor.

[0033] It is worth mentioning that the reinforcing ribs 104 are pre-welded on the inner wall of the outer shell 101 or the outer wall of the inner shell 102. By sleeve-fitting the outer shell 101 onto the outside of the inner shell 102, the reinforcing ribs 104 can respectively abut against the inner wall of the outer shell 101 or the outer wall of the inner shell 102. The reinforcing ribs 104 play a role in ensuring the structural strength of the motor housing 1.

[0034] A plurality of heat dissipation ribs 106 are arranged at intervals along the circumferential direction on the housing 101, and the heat dissipation ribs 106 are hollowed out with heat dissipation cavities 107 along the axial direction, and the heat dissipation cavities 107 are communicated with the liquid cooling cavity 10. In one embodiment, the heat dissipation cavities 107 do not penetrate the two ends of the heat dissipation ribs 106, so that the two ends of the heat dissipation ribs 106 remain closed. In another embodiment, the heat dissipation cavities 107 penetrate the two ends of the heat dissipation ribs 106, and a sealing strip that matches the edge of each heat dissipation cavity 107 is circumferentially arranged on the outer edge of the sealing ring 103, and the sealing of the two ends of the motor housing 1 is achieved by the action of the sealing ring 103 and the sealing strip.

[0035] A cooling fan 12 is installed at the end of the rotating shaft 7. The cooling fan 12 is located at one side of the condensation section of the motor housing 1. After the rotating shaft 7 rotates, the cooling fan 12 can rotate, so that an axial air flow is formed outside the motor housing 1. A protective cover 13 covering the cooling fan 12 is also installed at the upper end of the motor housing 1.

[0036] Reference Figure 6 and Figure 7 As shown, an injection hole 14 is provided on the sealing ring 103 at the upper end of the motor housing 1, and the injection hole 14 is communicated with the liquid cooling chamber 10, wherein the injection hole 14 can also be provided on the sealing strip of the sealing ring 103, so that the injection hole 14 is communicated with the heat dissipation chamber 107, and the opening position of the injection hole 14 can be selected according to actual conditions, and this embodiment does not make a specific limitation, and the sealing ring 103 or the sealing strip on the sealing ring 103 is collectively referred to as the sealing ring 103.

[0037] A one-way check valve 15 is detachably mounted on the injection hole 14. In one embodiment, the one-way check valve 15 is threadedly connected to the injection hole 14, and the end surface of the one-way check valve 15 is flush with the surface of the sealing ring 103. Negative pressure is drawn into the liquid cooling chamber 10 through the one-way check valve 15 to keep the liquid cooling chamber 10 in a negative pressure state. In one embodiment, the negative pressure value of the liquid cooling chamber 10 is maintained at 0.04±0.002Mpa.

[0038] Next, the filling of the cooling medium 11 will be described.

[0039] Reference Figure 6 and Figure 7 As shown, the motor housing 1 is placed in a vertical direction, and the one-way check valve 15 is not installed on the injection hole 14. The cooling medium 11 is injected into the liquid cooling chamber 10 through the injection hole 14. The cooling medium 11 is injected at a low temperature. The cooling medium 11 is in liquid state when injected. The cooling medium 11 is a mixture of ammonia, freon, propane, and carbon dioxide. In order to ensure the cooling effect of the cooling medium 11 on the motor housing 1, the height of the cooling medium 11 injected into the liquid cooling chamber 10 reaches the heat absorption section, but not to the evaporation section.

[0040] After the cooling medium 11 is injected, a one-way check valve 15 is threadedly installed on the injection hole 14. The one-way check valve 15 is made of corrosion-resistant, high-temperature-resistant and wear-resistant materials. The flow direction of the one-way check valve 15 is from the liquid cooling chamber 10 to the outside. Through the external vacuum pump on the one-way check valve 15, the liquid cooling chamber 10 is evacuated with negative pressure through the vacuum pump. Since the cooling medium 11 is located in the heat absorption section, only the liquid cooling chamber 10 in the evaporation section and the condensation section is evacuated with negative pressure. Since the air pressure in the liquid cooling chamber 10 is lower than that in the outside, the negative pressure state in the liquid cooling chamber 10 can be maintained under the action of the one-way check valve 15. Through the liquid cooling chamber 10 in a negative pressure state, the cooling medium 11 in the liquid cooling chamber 10 can have a lower melting point.

[0041] Therefore, when the stator winding 9 of the motor generates heat due to resistance heat loss and eddy current loss in the magnetic field, the cooling medium 11 is heated and vaporized. The vaporized cooling medium 11 can absorb the heat transferred from the stator winding 9 to the motor housing 1. The vaporized cooling medium 11 rises in the liquid cooling chamber 10. Due to the temperature difference between the condensation section and the heat absorption section, the cooling medium 11 re-condenses into liquid in the condensation section and flows back to the heat absorption section under the action of gravity.

[0042] The present application realizes efficient heat dissipation of the motor through the gas-liquid phase change cycle of the cooling medium 11, and forms a continuously circulating motor heat dissipation system. This heat dissipation method is convenient and portable, has good heat dissipation effect, and can effectively improve the working efficiency and service life of the motor.

[0043] During later maintenance, the cooling medium 11 in the liquid cooling chamber 10 becomes less, and it is only necessary to rotate the one-way check valve 15 to add the cooling medium 11 back into the liquid cooling chamber 10 and then evacuate the liquid cooling chamber 10, thereby reducing the later maintenance cost.

[0044] Embodiment 2 A vertical water pump provided in this application adopts the following technical solution: A vertical water pump comprises a pump body and an electric motor with good heat dissipation effect arranged on the pump body in a vertical direction as described in the above technical solution.

[0045] The motor in the present application is used in a vertical water pump. The present application realizes efficient heat dissipation of the motor through the gas-liquid phase change cycle of the cooling medium 11, and forms a continuously circulating motor heat dissipation system. This heat dissipation method is convenient and portable, has good heat dissipation effect, can effectively improve the working efficiency and service life of the vertical water pump, and has low later maintenance costs.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electric motor with good heat dissipation effect, comprising a motor housing (1), and a front cover (2) and a rear cover (3) arranged on the motor housing (1), a rotating shaft (7) being arranged in the motor housing (1), a rotor (8) being arranged on the rotating shaft (7), and a stator winding (9) cooperating with the rotor (8) being arranged in the motor housing (1), characterized in that: The motor housing (1) is hollowed out to form a liquid cooling chamber (10), the liquid cooling chamber (10) is filled with a cooling medium (11), the motor housing (1) is arranged and installed in a vertical direction, and the motor housing (1) is divided into a heat absorption section, an evaporation section and a condensation section from bottom to top in the vertical direction, and the stator winding (9) is only in contact with the heat absorption section of the motor housing (1).

2. The motor with good heat dissipation effect according to claim 1, characterized in that: The motor housing (1) comprises an outer shell (101) and an inner shell (102); the outer shell (101) is covered on the outside of the inner shell (102); the liquid cooling cavity (100) is formed between the outer shell (101) and the inner shell (102); and sealing rings (103) for sealing the liquid cooling cavity (100) are provided at both ends of the outer shell (101) and the inner shell (102).

3. The motor with good heat dissipation effect according to claim 2, characterized in that: The outer ring edge of the sealing ring (103) is connected to the outer shell (101) by welding, and the inner ring edge of the sealing ring (103) is connected to the inner shell (102) by welding.

4. The motor with good heat dissipation effect according to claim 2, characterized in that: A plurality of reinforcing ribs (104) are arranged in the liquid cooling cavity (10) at intervals along the circumferential direction, a flow cavity is formed between adjacent reinforcing ribs (104), and a flow port (105) is arranged at the lower end of each reinforcing rib (104), and adjacent flow cavities are connected through the flow port (105).

5. The motor with good heat dissipation effect according to claim 2, characterized in that: An injection hole (14) is provided on the sealing ring (103) at the upper end of the motor housing (1), and a one-way check valve (15) is detachably mounted on the injection hole (14). Negative pressure is drawn into the liquid cooling chamber (10) through the one-way check valve (15) to keep the liquid cooling chamber (10) in a negative pressure state.

6. The motor with good heat dissipation effect according to claim 5, characterized in that: The negative pressure value of the liquid cooling chamber (10) is maintained at 0.04±0.002Mpa.

7. The motor with good heat dissipation effect according to claim 5, characterized in that: The one-way check valve (15) is connected to the injection hole (14) via threads, and the end surface of the one-way check valve (15) is flush with the surface of the sealing ring (103).

8. The motor with good heat dissipation effect according to claim 1, characterized in that: A plurality of heat dissipation ribs (106) are arranged at intervals along the circumferential direction on the shell (101); a heat dissipation cavity (107) is hollowed out in the axial direction of the heat dissipation ribs (106); and the heat dissipation cavity (107) is communicated with the liquid cooling cavity (10).

9. The motor with good heat dissipation effect according to claim 1, characterized in that: A cooling fan (12) is installed at the end of the rotating shaft (7), and the cooling fan (12) is located on one side of the condensation section of the motor housing (1).

10. A vertical water pump, characterized in that: The invention comprises a pump body, and an electric motor with good heat dissipation effect as claimed in any one of claims 1 to 9 which is arranged on the pump body in a vertical direction.

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