Oil-cooled motor with pressure relief device and high-pressure brushless angle grinder using same
By introducing a pressure relief valve structure into the oil-cooled motor, the oil leakage problem caused by thermal expansion and contraction is solved, effective cooling and oil leakage prevention effect is achieved, and the reliability and durability of the motor are improved.
Patent Information
- Application Number
- CN202422427583.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-10-09
AI Technical Summary
Traditional oil-cooled motors cause oil leakage when they are running, and the prior art has failed to effectively solve the oil leakage problem caused by internal bloating of the motor.
A pressure relief valve is set up in the oil-cooled motor, including the valve body and the valve core, and the parallel relationship between the valve core and the valve body is maintained by springs. Combined with the design of the insulated end cap and aluminum shell, the internal pressure balance and pressure relief are achieved to prevent oil leakage.
It effectively avoids oil leakage caused by thermal expansion and contraction, improves the cooling effect and reliability of the motor, and ensures the safety and durability of the motor in harsh environments.
Smart Images
Figure CN223231029U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of angle grinders, in particular to an oil-cooling motor with a pressure relief device and a high-pressure brushless angle grinder using the oil-cooling motor. Background Art
[0002] Traditional oil-cooled motors generate heat during operation, and when the motor heats up, it can cause oil leakage. Summary of the Invention
[0003] The purpose of the utility model is to provide an oil-cooling motor structure to solve the problems existing in the prior art, so as to relieve the pressure inside the motor and avoid oil leakage caused by internal inflation of the motor.
[0004] In order to achieve the above objectives, the basic technical solution of the oil-cooled motor of the present invention is:
[0005] An oil-cooled motor with a pressure relief device includes a head shell at the front end and an insulating end cover at the rear end. An insulating upper cover and an aluminum shell are arranged between the head shell and the insulating end cover. An oil-containing space is formed between the insulating upper cover, the aluminum shell, the head shell, and the insulating end cover. The motor and liquid cooling oil are arranged in the oil-containing space; a pressure relief valve is embedded in the insulating end cover.
[0006] Furthermore, the pressure relief valve includes a valve body and a valve core, wherein the valve body is fixed on the insulating end cover, the valve core is inserted into the valve body, a spring is arranged between the valve core and the valve body, and the extension direction of the valve core is parallel to the length direction of the aluminum shell.
[0007] Furthermore, an oil seal is provided at the insulating end cover, and a sealing ring is provided at the insulating upper cover.
[0008] Furthermore, heat dissipation ribs are provided on the outside of the aluminum shell.
[0009] Furthermore, the motor includes a stator and a rotor. The rotor has a main shaft. The main shaft extends from the side of the insulating upper cover to the outside of the insulating end cover. The main shaft is provided with fan blades.
[0010] A high-voltage brushless angle grinder using an oil-cooled motor includes: a head shell, a head shell supporting shield, an output shaft is arranged in the shield, an insulating end cover is provided at the rear end, an insulating upper cover and an aluminum shell are provided between the head shell and the insulating end cover, an oil containing space is formed between the insulating upper cover, the aluminum shell, the head shell, and the insulating end cover, a motor and liquid cooling oil are provided in the oil containing space, the motor has a main shaft, and the main shaft is vertically meshed with the output shaft; a pressure relief valve is embedded in the insulating end cover.
[0011] Furthermore, the pressure relief valve includes a valve body and a valve core, wherein the valve body is fixed on the insulating end cover, the valve core is inserted into the valve body, a spring is arranged between the valve core and the valve body, and the length extension direction of the valve core is parallel to the extension direction of the main shaft.
[0012] Furthermore, the motor includes a stator and a rotor. The rotor has a main shaft. A motor fixing sleeve is provided on the main shaft. The stator is fixed on the motor fixing sleeve. A front bearing is provided at the front end of the main shaft. The front bearing supports the head shell.
[0013] Furthermore, the main shaft extends from the insulating upper cover side to the outer side of the insulating end cover, and fan blades are provided on the main shaft.
[0014] Furthermore, a rear bearing is provided at the rear end of the main shaft, an oil seal is provided at the insulating end cover, the oil seal is located between the rear bearing and the insulating end cover, a sealing ring is provided at the insulating end cover, and the sealing ring is provided between the head shell and the insulating upper cover.
[0015] The beneficial effects of the utility model are: 1. The temperature will rise after high-speed operation. Due to thermal expansion and contraction, when the running motor heats up, the internal part will produce flatulence due to the heat. The insulating end cover is provided with a pressure relief device to avoid the increase of internal pressure of the motor and prevent oil leakage.
[0016] 2. During operation, cooling oil is introduced from the inlet and fills the entire oil-containing space within the housing. This allows the cooling oil to be stirred during the operation of the motor's rotor, fully absorbing heat from the motor's internals and exchanging heat with the housing. The heat is then dissipated into the air through the aluminum heat dissipation ribs, achieving an ideal cooling effect. This shows that the present invention not only prevents dust and other particles from entering the motor in harsh environments prone to metal dust, but also provides effective cooling, is safe and reliable, and is cost-effective, ensuring the life of the motor and improving the durability of the high-voltage brushless angle grinder. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the oil-cooled motor in the high-pressure brushless angle grinder of the present utility model.
[0018] Figure 2 A side view of the structure of an oil-cooled motor.
[0019] Figure 3 for Figure 2 Cross-section at AA.
[0020] Figure 4 This is a structural diagram of a high-pressure brushless angle grinder of the utility model.
[0021] Figure 5 It is a structural diagram of the pressure relief valve.
[0022] Explanation of the reference numerals: head shell 10; insulating end cover 11; oil seal 111; pressure relief valve 112; valve body 113; valve core 114; spring 115; insulating upper cover 12; sealing ring 121; aluminum shell 13; heat dissipation rib 131; motor 14; stator 141; motor fixing sleeve 142; rotor 143; main shaft 15; front bearing 151; rear bearing 152; fan blade 153; shield 16; output shaft 161. DETAILED DESCRIPTION Example
[0023] The oil-cooled motor of this embodiment is as follows Figure 1 As shown, the oil-cooled motor has a front end and a rear end, with a head shell 10 at the front end and an insulating end cap 11 at the rear end. An insulating upper cover 12 and an aluminum shell 13 are disposed between the head shell 10 and the insulating end cap 11. The insulating upper cover 12, aluminum shell 13, head shell 10, and insulating end cap 11 form an oil-containing space within which the motor and liquid cooling oil are contained. The aluminum shell 13 facilitates heat transfer from the liquid cooling oil to the outer surface of the aluminum shell 13 through heat transfer. The cooling airflow then removes heat from the outer surface of the aluminum shell 13, thereby reducing the motor's temperature and improving its efficiency and lifespan.
[0024] like Figure 2 and Figure 3 As shown, in order to prevent the cooling oil inside the aluminum shell 13 from leaking, an oil seal 111 is provided at the insulating end cover 11 , and a sealing ring 121 is provided at the insulating end cover 11 .
[0025] To prevent oil leakage, a pressure relief valve 112 is embedded in the insulating end cap 11. The pressure relief valve 112 includes a valve body 113 and a valve core 114. The valve body 113 is fixed to the insulating end cap 11, and the valve core 114 is inserted into the valve body 113. A spring 115 is provided between the valve core 114 and the valve body 113. The extension direction of the valve core 114 is parallel to the length direction of the aluminum shell 13. The valve core 114 connects the interior of the oil-cooled motor with the exterior of the oil-cooled motor. When the internal pressure of the oil-cooled motor reaches the set pressure, the pressure inside the oil-cooled motor is relieved to prevent oil leakage.
[0026] like Figure 4 As shown, a high-voltage brushless angle grinder using an oil-cooled motor includes: a head shell 10, a head shell 10 supporting a shield 16, an output shaft 161 is arranged in the shield 16, an insulating end cover 11 is provided at the rear end, an insulating upper cover 12 and an aluminum shell 13 are provided between the head shell 10 and the insulating end cover 11, a groove is provided at the end of the head shell 10, the insulating upper cover 12 is inserted into the groove, an oil-containing space is formed between the insulating upper cover 12, the aluminum shell 13, the head shell 10, and the insulating end cover 11, a motor and liquid cooling oil are arranged in the oil-containing space, and the motor has a main shaft 15, which is vertically meshed with the output shaft 161.
[0027] Heat dissipation ribs 131 are provided on the outside of the aluminum shell 13 . The heat dissipation ribs 131 are evenly distributed along the circumference of the aluminum shell 13 and extend axially, thereby further increasing the heat dissipation area of the aluminum shell 13 and improving the heat dissipation efficiency.
[0028] The oil-cooled motor includes a stator 141 and a rotor 143 . The rotor 143 has a main shaft 15 . A motor fixing sleeve 142 is provided on the main shaft 15 . The stator 141 is fixed on the motor fixing sleeve 142 . A front bearing 151 is provided at the front end of the main shaft 15 . The front bearing 151 supports the head shell 10 .
[0029] like Figure 5 As shown, a pressure relief valve 112 is provided on the insulating end cover 11. The pressure relief valve 112 includes a valve body 113 and a valve core 114, wherein the valve body 113 is fixed to the insulating end cover 11, the valve core 114 is inserted into the valve body 113, and a spring 115 is provided between the valve core 114 and the valve body 113. The extension direction of the valve core 114 is parallel to the length direction of the aluminum shell 13.
[0030] The main shaft 15 extends from the insulating upper cover 12 to the outside of the insulating end cover 11. It is equipped with fan blades 153. When the internal pressure of the oil-cooled motor reaches a set pressure, the motor is decompressed. Rotating fan blades 153 generate negative pressure, drawing heat from the heat dissipating ribs 131 outside the aluminum shell 13 and decompressed gas from the oil-cooled motor out of the housing, thereby lowering the temperature of the oil-cooled motor and minimizing its temperature rise.
[0031] A rear bearing 152 is provided at the rear end of the main shaft 15. An oil seal 111 is provided on the insulating end cover 11. The oil seal 111 is located between the rear bearing 152 and the insulating end cover 11. A sealing ring 121 is provided on the insulating end cover 11. The sealing ring 121 is provided between the head shell 10 and the insulating upper cover 12. This forms a sealed space to prevent cooling oil from leaking from the oil containing space.
[0032] The working principle of this utility model is that when an oil-cooled motor runs at high speed, its temperature rises. Due to thermal expansion and contraction, the internal part of the oil-cooled motor expands due to the heat, which causes oil leakage. The oil-cooled motor is equipped with a pressure relief valve. When the pressure reaches the set pressure, the pressure inside the oil-cooled motor is relieved, preventing oil leakage.
[0033] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.
Claims
1. An oil-cooled motor with a pressure relief device, characterized in that: The oil-cooled motor has a front end and a rear end, the front end has a head shell, and the rear end has an insulating end cover. An insulating upper cover and an aluminum shell are arranged between the head shell and the insulating end cover. An oil-containing space is formed between the insulating upper cover, the aluminum shell, the head shell, and the insulating end cover. The motor and liquid cooling oil are arranged in the oil-containing space; a pressure relief valve is embedded in the insulating end cover.
2. The oil-cooled motor according to claim 1, characterized in that: The pressure relief valve includes a valve body and a valve core, wherein the valve body is fixed on the insulating end cover, the valve core is inserted into the valve body, a spring is arranged between the valve core and the valve body, and the extension direction of the valve core is parallel to the length direction of the aluminum shell.
3. The oil-cooled motor according to claim 2, characterized in that: An oil seal is provided at the insulating end cover, and a sealing ring is provided at the insulating upper cover.
4. The oil-cooled motor according to claim 3, characterized in that: Heat dissipation ribs are provided on the outside of the aluminum shell.
5. The oil-cooled motor according to claim 4, characterized in that: The motor comprises a stator and a rotor. The rotor has a main shaft. The main shaft extends from the side of the insulating upper cover to the outside of the insulating end cover. The main shaft is provided with fan blades.
6. A high-pressure brushless angle grinder using an oil-cooled motor, characterized in that: include: The head shell supports the protective cover, the output shaft is arranged in the protective cover, the rear end is provided with an insulating end cover, an insulating upper cover and an aluminum shell are arranged between the head shell and the insulating end cover, an oil containing space is formed between the insulating upper cover, the aluminum shell, the head shell and the insulating end cover, a motor and liquid cooling oil are arranged in the oil containing space, the motor has a main shaft, and the main shaft is vertically meshed with the output shaft; a pressure relief valve is embedded in the insulating end cover.
7. The high-pressure brushless angle grinder according to claim 6, characterized in that: The pressure relief valve includes a valve body and a valve core, wherein the valve body is fixed on the insulating end cover, the valve core is inserted into the valve body, a spring is arranged between the valve core and the valve body, and the length extension direction of the valve core is parallel to the extension direction of the main shaft.
8. The high-pressure brushless angle grinder according to claim 7, characterized in that: The motor includes a stator and a rotor. The rotor has a main shaft. A motor fixing sleeve is provided on the main shaft. The stator is fixed on the motor fixing sleeve. A front bearing is provided at the front end of the main shaft. The front bearing supports the head shell.
9. The high-pressure brushless angle grinder according to claim 8, characterized in that: The main shaft extends from the side of the insulating upper cover to the outside of the insulating end cover, and the main shaft is provided with fan blades.
10. The high-pressure brushless angle grinder according to claim 9, characterized in that: A rear bearing is provided at the rear end of the main shaft, an oil seal is provided at the insulating end cover, the oil seal is located between the rear bearing and the insulating end cover, a sealing ring is provided at the insulating end cover, and the sealing ring is provided between the head shell and the insulating upper cover.