Electric compressor

Abstract

The utility model discloses an electric compressor, comprising a drive motor, a compressor, a frictional planetary speed-increasing mechanism and a self-circulating lubrication system, wherein the planetary speed-increasing mechanism comprises a planetary outer ring, a planetary roller and a sun wheel which are installed in a compression manner, the planetary outer ring is rigidly connected to the motor output shaft of the drive motor, the sun wheel shaft output end of the sun wheel is rigidly connected to the impeller of the compressor, and the self-circulating lubrication system comprises a traction fluid tank and an oil pump which is installed on the output shaft of the drive motor and is located between the planetary speed-increasing mechanism and the drive motor; the electric compressor of the utility model, under the condition of adopting a low-voltage, low-speed permanent magnet synchronous drive motor, can drive the compressor to obtain a high-speed, large-flow output through the frictional planetary speed-increasing mechanism; through the self-circulating lubrication system and the spiral cooling water channel, effective heat dissipation and temperature reduction are carried out, thereby improving the reliability and service life of the whole machine and matching it well with the vehicle machine working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, in particular to an electric air compressor. Background Art

[0002] Electric compressors have the advantages of increasing the power of the engine at low speeds, reducing fuel consumption, increasing low-speed torque, reducing exhaust pollution, and recovering power at plateaus, while keeping the engine structure unchanged. Ordinary electric compressors use ordinary bearings, which result in low maximum speeds, short service life, and high noise. Electric compressors that use air bearing high-speed motors (motor speeds exceeding 10,000 revolutions per minute, or even as high as tens of thousands to hundreds of thousands of revolutions) have a low utilization rate because they cannot adapt to the vibration conditions of vehicle engines. Most of the electric compressors currently available on the market are higher voltage (above 60V) electric compressors, while most internal combustion engine passenger cars and commercial vehicles can only provide 24V / 48V safe low voltages, which makes matching difficult.

[0003] With increasingly stringent emission regulations, the electric compound supercharging system consisting of an electric compressor and an exhaust gas turbocharger in series is an effective way to solve the lack of low-speed torque of turbocharged diesel engines and improve engine acceleration smoke emissions, and is being studied and applied more and more.

[0004] Therefore, how to develop a new electric compressor that can drive the compressor to obtain high-speed and large-flow output while using a low-voltage, low-speed motor has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In view of this, the technical problem to be solved by the utility model is: to provide an electric compressor that can drive the compressor to obtain high-speed, large-flow output while using a low-voltage, low-speed motor, thereby improving the vehicle-machine working condition matching and service life.

[0006] To solve the above technical problems, the technical solution of the utility model is: an electric compressor, the electric compressor includes a drive motor and a compressor, and also includes a friction-type planetary speed-increasing mechanism and a self-circulating lubrication system; the planetary speed-increasing mechanism includes a planetary outer ring, a planetary roller and a sun gear, the planetary outer ring, the planetary roller and the sun gear are installed in a compression manner, the planetary outer ring is rigidly connected to the motor output shaft of the drive motor, and the sun gear shaft output end of the sun gear is rigidly connected to the impeller of the compressor; the self-circulating lubrication system includes an oil pump and a traction fluid tank, the oil pump is located between the planetary speed-increasing mechanism and the drive motor, and is installed on the motor output shaft of the drive motor, the oil pump absorbs the oil in the traction fluid tank through the oil inlet channel at the bottom of the shell and pumps it to the planetary speed-increasing mechanism, the oil after flowing through the planetary speed-increasing mechanism is absorbed and pumped by the oil pump from the oil channel at the bottom of the planetary speed-increasing mechanism, and flows back to the traction fluid tank through the oil return channel at the upper part of the shell.

[0007] The following are several further improvements to the electric compressor of the utility model:

[0008] Among them, one arrangement of the planetary rollers is that the planetary rollers include three evenly distributed identical planetary rollers, and the sun wheel is coaxial with the planetary outer ring.

[0009] Another arrangement of the planetary rollers is that three planetary rollers are arranged, the outer diameter of one planetary roller is larger than the outer diameters of the other two planetary rollers, and the axis of the sun gear does not coincide with the axis of the planetary outer ring.

[0010] Wherein, the oil pump is a double-acting vane pump, including an oil pump stator, an oil pump rotor and an oil pump vane, having two oil suction areas and two oil discharge areas, and the oil pump rotor is installed at the end of the motor output shaft of the drive motor.

[0011] Among them, further, a hollow axial oil passage is provided at the end of the motor output shaft, a radial oil passage connected to the axial oil passage is opened on the bottom end cover of the oil pump rotor, the bottom oil inlet passage of the shell is connected to one of the oil suction areas, the bottom oil passage of the planetary speed increasing mechanism is connected to another oil suction area, one oil discharge area is connected to the radial oil passage, and the other oil discharge area is connected to the upper oil return passage of the shell.

[0012] Among them, spiral cooling water channels are arranged between the planetary speed increasing mechanism, the driving motor and the outer casing of the electric compressor, and the outer casing is provided with a water inlet and a water outlet respectively connected to the spiral cooling water channel, the water inlet is close to the planetary speed increasing mechanism, and the water outlet is close to the driving motor.

[0013] Wherein, the driving motor adopts a low-voltage, low-speed permanent magnet synchronous motor.

[0014] Wherein, the driving motor is connected to a 24V / 48V power supply.

[0015] Wherein, the traction fluid tank is integrated outside the rear end of the drive motor.

[0016] Preferably, a filter is provided in the traction fluid tank.

[0017] After adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0018] Since the electric compressor of the utility model includes a drive motor and a compressor driven by the drive motor, a friction planetary speed-increasing mechanism and a self-circulating lubrication system, the planetary speed-increasing mechanism includes a planetary outer ring, a planetary roller and a sun wheel installed in a compact manner, the planetary outer ring is rigidly connected to the motor output shaft of the drive motor, and the sun wheel shaft output end of the sun wheel is rigidly connected to the compressor impeller; when the electric compressor is working, the motor output shaft of the drive motor inputs power to the planetary speed-increasing mechanism, and the high speed is output to the compressor impeller through the planetary speed-increasing mechanism with a larger transmission ratio, so that the compressor impeller finally obtains a high speed, and when the air high pressure ratio and large flow output are achieved, a low-voltage and low-speed drive motor can be used to meet the requirements, thereby improving the motor life and meeting the requirements of matching vehicle machine working conditions (24V / 48V power supply). Under the condition of low speed input of the drive motor, the high speed output of the compressor impeller is achieved; the friction planetary speed-increasing mechanism is used to avoid the shortcomings of the traditional meshing planetary mechanism gear transmission, and the rolling friction transmission has low noise, low power consumption and high efficiency.

[0019] Since a self-circulating lubrication system is provided, the self-circulating lubrication system includes a traction fluid tank and an oil pump installed on the motor output shaft of the drive motor and located between the planetary speed increaser mechanism and the drive motor. When the electric compressor is working, the oil pump absorbs the oil in the traction fluid tank through the oil inlet channel at the bottom of the shell and pumps it to the planetary speed increaser mechanism to lubricate and cool it. After the traction fluid flows out of the planetary speed increaser mechanism, it is concentrated in the oil channel at the bottom of the planetary speed increaser mechanism and is absorbed and pumped by the oil pump again, and flows back to the traction fluid tank through the oil return channel on the upper part of the shell, forming a dynamic cycle, ensuring that the planetary speed increaser mechanism can be continuously lubricated and cooled, thereby ensuring its working reliability and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic cross-sectional structural diagram of an electric compressor according to an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 A structural schematic diagram of a planetary speed increasing mechanism;

[0022] Figure 3 yes Figure 1 Another structural diagram of the planetary speed increasing mechanism;

[0023] Figure 4 yes Figure 1 Schematic diagram of the pump core structure principle of the oil pump;

[0024] Figure 5 is a schematic diagram of the flow path of the traction fluid in the oil pump;

[0025] Figure 6 This is a schematic diagram of the self-circulating path of the traction fluid of the electric compressor of the embodiment of the utility model;

[0026] Figure 7 This is a schematic diagram of a water cooling path of an electric compressor according to an embodiment of the utility model;

[0027] In the figure:

[0028] 1. Compressor;

[0029] 2. Planetary speed-increasing mechanism; 21. Planetary outer ring; 22. Planetary roller; 221. Planetary roller 1; 222. Planetary roller 2; 23. Sun gear; 24. Bearing; 25. Oil channel at the bottom of the planetary speed-increasing mechanism; 26. Cooling water channel of the planetary speed-increasing mechanism; 27. Water inlet;

[0030] 3. Oil pump; 31. Oil pump stator; 32. Oil pump rotor; 321. Radial oil passage; 322. Axial oil passage; 33. Oil pump blade; A1. Oil suction area 1; A2. Oil suction area 2; B1. Oil discharge area 1; B2. Oil discharge area 2;

[0031] 4. Driving motor; 41. Oil inlet channel at the bottom of the shell; 42. Oil return channel at the top of the shell; 43. Motor cooling water channel; 44. Transition water channel; 45. Water outlet;

[0032] 5. Traction fluid tank; 51. Filter. DETAILED DESCRIPTION

[0033] It should be noted that in the description of this article, unless otherwise specified or limited, the terms "connected", "connected", "connected", etc. should be understood in a broad sense, and can be a direct connection between two elements or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0034] The following is a non-limiting description of the embodiments of the present invention in further detail with reference to the accompanying drawings.

[0035] like Figures 1 to 7As shown together, the electric compressor of the embodiment of the utility model includes a drive motor 4 and a compressor 1 driven by the drive motor 4, a friction planetary speed increasing mechanism 2 and a self-circulating lubrication system, and the self-circulating lubrication system includes an oil pump 3 and a traction fluid tank 5.

[0036] Among them, the drive motor 4 is preferably a low-voltage, low-speed permanent magnet synchronous motor as a power source. For example, the drive motor 4 is connected to a 24V / 48V power supply under vehicle-machine conditions, and the rated speed is 5000-8000rpm. The motor is small in size, low in noise, and has a large output power. The low-voltage (24VDC / 48VDC) input can be applied to the power output of most internal combustion engine commercial vehicles and passenger cars, with a wide matching coverage and flexible matching.

[0037] like Figure 2 As shown, the planetary speed increasing mechanism 2 includes a planetary outer ring 21, a planetary roller 22 and a sun gear 23, the planetary outer ring 21, the planetary roller 22 and the sun gear 23 are installed together in a press fit (interference fit), and rolling friction transmission is used between the planetary outer ring 21, the planetary roller 22 and the sun gear 23. Both ends of the planetary wheel shaft of each planetary roller 22 are respectively installed on the planetary wheel carrier (not shown in the figure) through bearings 24, the planetary outer ring 21 is rigidly connected to the motor output shaft of the drive motor 4 (for example, connected through a connecting rod or a spoke plate or a shift fork), and the sun wheel shaft output end of the sun wheel 23 is rigidly connected to the impeller of the compressor 1 (for example, press-fit connection). Figure 2 In the embodiment, three identical planetary rollers 22 are evenly distributed, and the sun wheel 23 is coaxial with the planetary outer ring 21. The planetary rollers are arranged in this way, which has a simple structure, low production cost and is easy to assemble. Figure 2 As shown by the middle arrow, the planetary outer ring 21, the planetary roller 22 and the motor output shaft rotate in the same direction, and the sun gear 23 rotates in the opposite direction to the planetary roller 22. When working, the motor output shaft transmits power to the planetary outer ring 21 rigidly connected thereto, and finally outputs the power to the compressor impeller through the sun gear 23 through rolling friction transmission among the planetary outer ring 21, the planetary roller 22 and the sun gear 23.

[0038] The friction type planetary speed increasing mechanism is not only small in size, low in noise, high in transmission ratio (1:5-1:15, or even higher), high in efficiency, but also low in power consumption. It enables the compressor 1 to achieve high speed output of the compressor impeller under the condition of low voltage and low speed input of the driving motor 4, and meets the requirements of high speed and large flow output of the compressor. Moreover, compared with the planetary speed increasing mechanism of the traditional gear meshing transmission mode, the friction type planetary speed increasing mechanism overcomes the shortcomings of gear transmission, adopts rolling friction transmission, has low noise, low power consumption and high efficiency.

[0039] like Figure 3As shown, another friction planetary speed increasing mechanism of setting mode is illustrated, which is also provided with a planetary outer ring 21, three planetary rollers and a sun gear 23 which are installed together by pressing. Among them, the outer diameter of one planetary roller (planetary roller 222) is larger than the outer diameter of the other two planetary rollers (planetary roller 1 221), and the axis of the sun gear 23 does not coincide with the planetary outer ring 21. The friction planetary speed increasing mechanism of this mode has a safe activity gap for the planetary rollers, strong stability, and low requirements for the cleanliness of the traction fluid.

[0040] like Figure 4 , Figure 5 and Figure 6 As shown, the self-circulating lubrication system includes an oil pump 3 and a traction fluid tank 5. The traction fluid tank 5 is integrated outside the rear end of the drive motor 4, and a filter 51 is arranged in the traction fluid tank 5. The oil pump 3 is located between the planetary speed increasing mechanism 2 and the drive motor 4, and is installed on the motor output shaft of the drive motor 4. The oil pump 3 absorbs the oil in the traction fluid tank 5 through the oil inlet channel 41 at the bottom of the shell and pumps it to the planetary speed increasing mechanism 2. The oil after flowing through the planetary speed increasing mechanism 2 is sucked and pumped by the oil pump 3 from the oil channel 25 at the bottom of the planetary speed increasing mechanism, and flows back to the traction fluid tank 5 through the filter 51 through the oil return channel 42 at the upper part of the shell, forming a self-circulating lubrication system. The arrow in the figure shows the flow path of the traction fluid.

[0041] like Figure 4 As shown, the oil pump 3 is preferably a double-acting vane pump, and the pump core part of the double-acting vane pump mainly includes an oil pump stator 31, an oil pump rotor 32 and a plurality of oil pump blades 33, and has two oil suction areas (respectively recorded as oil suction area 1 A1 and oil suction area 2 A2) and two oil discharge areas (respectively recorded as oil discharge area 1 B1 and oil discharge area 2 B2), and the oil pump rotor 32 is installed at the end of the motor output shaft of the drive motor 4.

[0042] like Figure 4 , Figure 5 and Figure 6 As shown, a hollow axial oil passage 322 is provided at the end of the motor output shaft, a radial oil passage 321 connected to the axial oil passage 322 is opened on the bottom end cover of the oil pump rotor 32, the bottom oil inlet passage 41 of the shell is connected to an oil suction area (for example, oil suction area A1), the bottom oil passage 25 of the planetary speed increasing mechanism is connected to another oil suction area (for example, oil suction area A2), an oil discharge area (for example, oil discharge area B1) is connected to the radial oil passage 321, and another oil discharge area (for example, oil discharge area B2) is connected to the upper oil return passage 42 of the shell.

[0043] When working, the oil pump 3 rotates with the motor output shaft, driving the traction fluid to flow from the designated oil path to meet the lubrication and cooling requirements of the planetary speed increasing mechanism 2. The oil pump rotor 32 and the oil pump blades 33 move in coordination to achieve volume changes at two locations in the oil pump cavity, meeting the two-in and two-out flow requirements of the traction fluid. When the oil pump works, the traction fluid in the traction fluid tank 5 is pumped into the oil pump 3 from the oil inlet channel 41 at the bottom of the shell, and is pumped into the planetary speed increasing mechanism 2 by the oil pump 3 through the radial oil channel 321 and the axial oil channel 322. After the flowing traction fluid flows out of the planetary speed increasing mechanism 2, it is concentrated to the bottom under the action of gravity, and enters the oil pump 3 again through the oil channel 25 at the bottom of the planetary speed increasing mechanism. The oil pump performs secondary work on the traction fluid, pumping the traction fluid into the upper oil return channel 42 of the shell, and the traction fluid enters the filter 51 along the flow channel, and the filtered traction fluid returns to the traction fluid tank 5. Since the planetary speed increaser mechanism is equipped with a self-circulating lubrication system in the whole machine, the circulating traction fluid lubricates and cools the planetary speed increaser mechanism when it is running. The entire lubrication system integrates power input, circulation, storage, filtration and heat dissipation, which minimizes space occupancy and further improves product flexibility.

[0044] like Figure 7 As shown, a water cooling system is provided inside the whole electric compressor, and the water cooling system includes a spiral cooling water circulation channel to effectively dissipate heat and reduce temperature, thereby improving the reliability and service life of the whole machine. A spiral cooling water channel is provided between the outer casing of the electric compressor and the planetary speed increasing mechanism 2 and the drive motor 4. The spiral cooling water channel includes a planetary speed increasing mechanism cooling water channel 26 and a motor cooling water channel 43 connected through a transition water channel 44. A water inlet 27 and a water outlet 45 respectively connected to the spiral cooling water channel are provided on the outer casing. The water inlet 27 is close to the planetary speed increasing mechanism 2, and the water outlet 45 is close to the drive motor 4. The cooling water flows in from the water inlet 27, passes through the planetary speed increasing mechanism cooling water channel 26, passes through the transition water channel 44, enters the motor cooling water channel 43 on the outside of the motor stator, and finally flows out from the water outlet 45. Figure 7 The arrow in the middle shows the cooling water flow path. The cooling water channel has a large heat dissipation area, small flow resistance, and good cooling effect.

[0045] In summary, the electric compressor of the embodiment of the utility model, when adopting a low-voltage, low-speed drive motor as a power source, can drive the compressor to obtain high-speed, large-flow output through a friction-type planetary speed increaser mechanism; through a self-circulating lubrication system and a spiral cooling water channel, effective heat dissipation and temperature reduction are performed, thereby improving the reliability and service life of the whole machine.

[0046] The above description is an example of a preferred embodiment of the present invention, and the parts not described in detail are all known technologies in the art. The protection scope of the present invention is based on the content of the claims, and any equivalent changes based on the technical inspiration of the present invention are within the protection scope of the present invention.

Claims

1. An electric compressor, comprising a drive motor and a compressor, characterized in that: Also includes: A friction-type planetary speed-increasing mechanism, the planetary speed-increasing mechanism comprises a planetary outer ring, a planetary roller and a sun wheel, the planetary outer ring, the planetary roller and the sun wheel are installed in a compression manner, the planetary outer ring is rigidly connected to the motor output shaft of the drive motor, and the sun wheel shaft output end of the sun wheel is rigidly connected to the impeller of the compressor; A self-circulating lubrication system, the self-circulating lubrication system includes an oil pump and a traction fluid tank. The oil pump is located between the planetary speed increasing mechanism and the drive motor and is installed on the motor output shaft of the drive motor. The oil pump absorbs the oil in the traction fluid tank through the oil inlet channel at the bottom of the shell and pumps it to the planetary speed increasing mechanism. The oil after flowing through the planetary speed increasing mechanism is absorbed and pumped by the oil pump from the oil channel at the bottom of the planetary speed increasing mechanism, and flows back to the traction fluid tank through the oil return channel at the top of the shell.

2. The electric compressor according to claim 1, characterized in that: The planetary rollers include three evenly distributed identical planetary rollers, and the sun wheel is coaxial with the planetary outer ring.

3. The electric compressor according to claim 1, characterized in that: There are three planetary rollers, one of which has an outer diameter greater than the outer diameters of the other two planetary rollers, and the axis of the sun gear does not coincide with the axis of the planetary outer ring.

4. The electric compressor according to claim 1, characterized in that: The oil pump is a double-acting vane pump, including an oil pump stator, an oil pump rotor and oil pump vanes, and has two oil suction areas and two oil discharge areas. The oil pump rotor is installed at the end of the motor output shaft of the drive motor.

5. The electric compressor according to claim 4, characterized in that: A hollow axial oil passage is provided at the end of the motor output shaft, a radial oil passage connected to the axial oil passage is provided on the bottom end cover of the oil pump rotor, the bottom oil inlet passage of the casing is connected to one of the oil suction areas, the bottom oil passage of the planetary speed increasing mechanism is connected to another oil suction area, one of the oil discharge areas is connected to the radial oil passage, and the other oil discharge area is connected to the upper oil return passage of the casing.

6. The electric compressor according to claim 1, characterized in that: A spiral cooling water channel is arranged between the planetary speed increasing mechanism, the drive motor and the outer shell of the electric compressor. The outer shell is provided with a water inlet and a water outlet respectively connected to the spiral cooling water channel. The water inlet is close to the planetary speed increasing mechanism, and the water outlet is close to the drive motor.

7. The electric compressor according to claim 1, characterized in that: The driving motor adopts a low-voltage, low-speed permanent magnet synchronous motor.

8. The electric compressor according to claim 7, characterized in that: The driving motor is connected to a 24V / 48V power supply.

9. The electric compressor according to claim 1, characterized in that: The traction fluid tank is integrated outside the rear end of the drive motor.

10. The electric compressor according to claim 1, characterized in that: A filter is arranged in the traction fluid tank.

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