Electric two-stage air compressor for vehicles

Abstract

The utility model relates to an air compressor, especially an electric two-stage air compressor for automobile, including motor, still include: crankshaft is connected with the motor, first compression part is located one side of crankshaft, and the inside activity is equipped with first piston, first connecting rod is rotatively connected with crankshaft and first piston respectively, second compression part is located the other side of crankshaft, and the inside activity is equipped with second piston, and second connecting rod is rotatively connected with crankshaft and second piston respectively, wherein, first piston and second piston work while moving to the direction of far away from crankshaft or moving to the direction of close to crankshaft simultaneously, the utility model provides an electric two-stage air compressor for automobile's two compression parts are located the both sides of crankshaft respectively, make the unbalance of piston operation mutual offset, greatly reduce vibration and noise, improve the service life.

Description

Technical Field

[0001] This utility model relates to an air compressor, and more particularly to an electric two-stage air compressor for automobiles. Background Technology

[0002] Automotive air compressors are mainly used for air suspension systems, seat adjustments, and tire inflation. Because each component has different requirements for air pressure and airflow, different air compressors are needed to supply air. Furthermore, the overall vehicle design needs to reduce the number of parts and the complexity of piping. Therefore, two-stage air compressors have emerged. For example, Chinese Patent 2024117941491 discloses a two-stage oil-lubricated piston electric air compressor, which includes a motor, cylinder, end cover, and housing. The end cover is fixed to the top of the cylinder, and the cylinder is fixed to the upper end of the housing. A crankshaft is housed inside the housing, and a coupling is connected to the right end of the crankshaft. The motor output end is connected to the other end of the coupling. The cylinder has a primary compression chamber and a secondary compression chamber. Each of the primary and secondary compression chambers is equipped with a piston that can move up and down. The bottom end of the piston is connected to the crankshaft. An interstage cooler is also fixed between the housing and the motor. An air guide shroud is also installed on the upper end of the interstage cooler. A centrifugal fan is also fixed on the coupling. The centrifugal fan is located inside the interstage cooler. An interstage cooling pipe is also connected to the cylinder at the primary compression chamber. The interstage cooling pipe extends between the centrifugal fan and the interstage cooler, and its other end is connected to the secondary compression chamber on the cylinder.

[0003] Since the primary and secondary compression chambers of the compressor are located on the same side of the crankshaft, the piston is subjected to unbalanced forces, which in turn generates strong vibrations. These vibrations cause significant noise and shorten the service life of the air compressor. Utility Model Content

[0004] To address the issues of excessive vibration, noise, and short service life in air compressors, this utility model provides an electric two-stage air compressor for automobiles. The specific technical solution is as follows: An electric two-stage air compressor for automobiles includes a motor, and further includes: a crankshaft connected to the motor; a first compression unit disposed on one side of the crankshaft, and having a first piston movably disposed therein; a first connecting rod rotatably connected to both the crankshaft and the first piston; a second compression unit disposed on the other side of the crankshaft, and having a second piston movably disposed therein; and a second connecting rod rotatably connected to both the crankshaft and the second piston; wherein, when the first piston and the second piston are operating, they simultaneously move away from the crankshaft or simultaneously move towards the crankshaft.

[0005] Preferably, the first piston and the second piston have the same or different diameters.

[0006] Preferably, the first compression section and the second compression section are arranged approximately symmetrically.

[0007] Preferably, the motor is provided with a cooling air passage, which is connected to the air inlets of the first compression section and the second compression section.

[0008] Preferably, it further includes: a drive housing, which is connected to the first compression unit and the second compression unit respectively, and both ends of the crankshaft are rotatably disposed in the drive housing.

[0009] Preferably, the first compression section and the second compression section have the same structure; the first piston is provided with a first piston ring and a first piston rod connected to the first piston ring, the first piston ring is movably disposed in the first piston chamber, the first piston ring divides the first piston chamber into a primary compression chamber and a secondary compression chamber, the first piston rod is movably disposed in the first communicating chamber, and the first piston rod and the first piston ring are provided with a primary air passage communicating with the primary compression chamber and a secondary air passage communicating with the secondary compression chamber; the first compression section further includes: a first cylinder body, the first cylinder body is provided with a first piston chamber and a first communicating chamber communicating with the first piston chamber, the first communicating chamber... The diameter of the piston ring is smaller than the diameter of the first piston chamber; an exhaust check valve is located on the first cylinder and communicates with the first piston chamber; a first check valve is located on the first-stage air path and within the first-stage compression chamber; a second check valve is located on the second-stage air path and within the second-stage compression chamber; wherein, when the first piston ring moves toward the second-stage compression chamber, air enters the first-stage compression chamber through the first-stage air path and the first check valve, and air in the second-stage compression chamber is discharged through the exhaust check valve; when the first piston ring moves toward the first-stage compression chamber, air in the first-stage compression chamber enters the second-stage compression chamber through the second-stage air path and the second check valve.

[0010] Furthermore, it also includes: a third check valve, which is located at one end of the secondary air passage and on the first piston ring, and a second check valve is located at the other end of the secondary air passage and on the first piston rod.

[0011] Furthermore, it also includes: a first sealing ring, disposed on the first piston ring and movably inserted into the first piston cavity; The second sealing ring is disposed on the first piston rod and is movably inserted into the first communicating cavity.

[0012] Furthermore, it also includes: a first guide ring disposed on the first piston ring and movably inserted into the first piston cavity; and a second guide ring disposed on the first piston rod and movably inserted into the first communicating cavity.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an electric two-stage air compressor for automobiles, in which the two compression sections are located on both sides of the crankshaft, so that the imbalance during piston operation cancels each other out, greatly reducing vibration and noise and improving service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a schematic diagram showing the simultaneous primary compression of the first and second pistons in this application; Figure 3 This is a schematic diagram showing the simultaneous two-stage compression of the first and second pistons in this application; Figure 4 This is a schematic diagram of the structure of the first piston and the first cylinder. Figure 5 This is a schematic diagram of the first piston. Figure 6 This is a schematic diagram of the first piston ring moving towards the secondary compression chamber; Figure 7 This is a schematic diagram of the first piston ring moving towards the first-stage compression chamber; Figure 8 This is a partial sectional view of this application. Detailed Implementation

[0015] The present invention will now be further described with reference to the accompanying drawings.

[0016] like Figures 1 to 8 As shown, an electric two-stage air compressor for automobiles includes a motor 7, a crankshaft 81, a first compression section 61, a first connecting rod 83, a second compression section 62, and a second connecting rod 84. The crankshaft 81 is fixedly connected to the motor 7 and rotatably connected to the first connecting rod 83 and the second connecting rod 84. The first compression section 61 and the second compression section 62 are located on opposite sides of the crankshaft 81. A first piston 2 is movably mounted inside the first compression section 61 and rotatably connected to the first connecting rod 83. A second piston 5 is movably mounted inside the second compression section 62 and rotatably connected to the second connecting rod 84. When the first piston 2 and the second piston 5 are working, they move simultaneously away from the crankshaft 81 or simultaneously towards the crankshaft 81.

[0017] By arranging the pistons in this way, the imbalances in the first and second stages cancel each other out, thus achieving almost vibration-free operation.

[0018] The first piston 2 and the second piston 5 may have the same or different diameters. When the first piston 2 and the second piston 5 have the same diameter, they provide the same air pressure. When the first piston 2 and the second piston 5 have different diameters, they provide different air pressures, thus meeting different air pressure requirements.

[0019] To further reduce vibration, the first compression section 61 and the second compression section 62 are arranged nearly symmetrically. The first compression section 61 and the second compression section 62 are arranged along the length of the crankshaft 81, but the distance between them is small and nearly symmetrical, which makes the effect of counteracting imbalance better.

[0020] To cool the motor 7, a cooling air passage 71 is provided on the motor 7, which is connected to the air inlets of the first compression section 61 and the second compression section 62. The air entering the cooling air passage 71 of the motor 7 needs to be filtered first using a filter.

[0021] The automotive electric two-stage air compressor also includes a drive housing 82, which is connected to the first compression section 61 and the second compression section 62, respectively. Both ends of the crankshaft 81 are rotatably mounted within the drive housing 82. Bearings are provided at both ends of the crankshaft 81, and both ends of the crankshaft 81 are fixed to the drive housing 82 via the bearings, improving the strength of the crankshaft 81 and reducing vibration. The motor 7 is fixed to one end of the drive housing 82.

[0022] The first compression section 61 and the second compression section 62 have the same structure. If the provided air pressure is the same, the first compression section 61 and the second compression section 62 also have the same dimensions. If the provided air pressure is different, the first compression section 61 and the second compression section 62 only have the same structure but different dimensions. Specifically, the first compression section 61 includes a first cylinder 1, a first piston 2, an exhaust check valve 34, a first check valve 31, and a second check valve 32. The first cylinder 1 has a first piston chamber and a first connecting chamber 15 communicating with the first piston chamber. The diameter of the first connecting chamber 15 is smaller than the diameter of the first piston chamber. The exhaust check valve 34 is installed on the first cylinder 1 and communicates with the first piston chamber to discharge compressed gas. The first piston 2 includes a first piston ring 21 and a first piston rod 22 fixed together. The first piston ring 21 and the first piston rod 22 are arranged coaxially. The center of the first piston rod 22 has an air inlet chamber. The first piston ring 21 is movably inserted into the first piston chamber. The first piston ring 21 compresses the first piston chamber. The system is divided into a primary compression chamber 11 and a secondary compression chamber 12. The first piston rod 22 is movably inserted into the first connecting chamber 15. The first piston rod 22 and the first piston ring 21 are provided with a primary air passage 23 communicating with the primary compression chamber 11 and a secondary air passage 24 communicating with the secondary compression chamber 12. One end of the primary air passage 23 is located on the first piston ring 21 and communicates with the primary compression chamber 11, while the other end of the primary air passage 23 communicates with the air inlet chamber of the first piston rod 22. One end of the secondary air passage 24 is located on the first piston ring 21 and communicates with the primary compression chamber 11, while the other end of the secondary air passage 24 is located on one side of the first piston rod 22 and communicates with the secondary compression chamber 12. The secondary air passage 24 passes through the first piston ring 21 and the first piston rod 22. The first check valve 31 is fixed at one end of the primary air passage 23 and is located inside the primary compression chamber 11, allowing air to enter only the primary compression chamber 11. The second check valve 32 is installed on the secondary air passage 24 and is located inside the secondary compression chamber 12, allowing air to enter the secondary compression chamber 12 only from the primary compression chamber 11. When the first piston ring 21 moves toward the secondary compression chamber 12, air enters the primary compression chamber 11 through the primary air passage 23 and the first check valve 31, and the air in the secondary compression chamber 12 is discharged through the exhaust check valve 34. When the first piston ring 21 moves toward the primary compression chamber 11, the air in the primary compression chamber 11 enters the secondary compression chamber 12 through the secondary air passage 24 and the second check valve 32.

[0023] To further improve sealing and prevent compressed gas backflow, a third check valve 33 is also included. The third check valve 33 is located at one end of the secondary gas passage 24 and on the first piston ring 21. The third check valve 33 is located between the first piston ring 21 and the first piston rod 22. The second check valve 32 is located at the other end of the secondary gas passage 24 and on the first piston rod 22.

[0024] To improve the sealing between the first piston ring 21 and the first piston chamber, and between the first piston rod 22 and the first connecting cavity 15, a first sealing ring 41 and a second sealing ring 42 are also included. The first sealing ring 41 is fixed on the first piston ring 21 and is movably inserted into the first piston chamber; the second sealing ring 42 is fixed on the first piston rod 22 and is movably inserted into the first connecting cavity 15.

[0025] The two-stage piston assembly also includes a first guide ring 43 and a second guide ring 44. The first guide ring 43 is fixed on the first piston ring 21 and is movably inserted into the first piston cavity; the second guide ring 44 is fixed on the first piston rod 22 and is movably inserted into the first connecting cavity 15.

[0026] The check valve is a diaphragm type.

[0027] When the secondary compression chamber 12 compresses air, the primary compression chamber 11 receives air, and when the primary compression chamber 11 compresses air, the secondary compression chamber 12 receives air. This ensures that the air is first compressed in the primary compression chamber 11 before entering the secondary compression chamber 12, increasing the gas pressure and flow rate. One rotation of the crankshaft 81 drives the piston to reciprocate once, achieving two compressions and greatly improving compression efficiency.

[0028] This two-stage piston assembly has a very compact structure, which can greatly reduce the size; at the same time, this two-stage piston assembly can achieve a high air delivery rate and a high final pressure.

[0029] Furthermore, compressors equipped with two-stage piston assemblies can be easily scaled up by adding two-stage piston assemblies of the same structure.

[0030] The electric two-stage air compressor for this car features very low vibration and noise.

[0031] Because any number of additional pistons can be installed, the size adjustment of horizontally opposed compressors is relatively easy.

[0032] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. An electric two-stage air compressor for automobiles, comprising a motor (7), characterized in that, Also includes: A crankshaft (81) is connected to the motor (7); The first compression section (61) is located on one side of the crankshaft (81) and a first piston (2) is movably disposed inside it. The first connecting rod (83) is rotatably connected to the crankshaft (81) and the first piston (2), respectively; A second compression section (62) is located on the other side of the crankshaft (81), and a second piston (5) is movably mounted inside it; and The second connecting rod (84) is rotatably connected to the crankshaft (81) and the second piston (5), respectively; When the first piston (2) and the second piston (5) are working, they move simultaneously away from the crankshaft (81) or simultaneously toward the crankshaft (81).

2. The two-stage electric air compressor for automobiles according to claim 1, characterized in that, The diameter of the first piston (2) may be the same as or different from that of the second piston (5).

3. The two-stage electric air compressor for automobiles according to claim 1, characterized in that, The first compression section (61) and the second compression section (62) are arranged in a nearly symmetrical manner.

4. The two-stage electric air compressor for automobiles according to claim 1, characterized in that, The motor (7) is provided with a cooling air passage (71), which is connected to the air inlets of the first compression section (61) and the second compression section (62).

5. The two-stage electric air compressor for automobiles according to claim 1, characterized in that, Also includes: The drive housing (82) is connected to the first compression unit (61) and the second compression unit (62) respectively, and the two ends of the crankshaft (81) are rotatably disposed in the drive housing (82).

6. A two-stage electric air compressor for automobiles according to any one of claims 1 to 5, characterized in that, The first compression section (61) and the second compression section (62) have the same structure; The first compression unit (61) further includes: The first cylinder (1) is provided with a first piston chamber and a first connecting chamber (15) communicating with the first piston chamber. The diameter of the first connecting chamber (15) is smaller than the diameter of the first piston chamber. The first piston (2) is provided with a first piston ring (21) and a first piston rod (22) connected to the first piston ring (21). The first piston ring (21) is movably disposed in the first piston chamber. The first piston ring (21) divides the first piston chamber into a primary compression chamber (11) and a secondary compression chamber (12). The first piston rod (22) is movably disposed in the first communicating chamber (15). The first piston rod (22) and the first piston ring (21) are provided with a primary air passage (23) communicating with the primary compression chamber (11) and a secondary air passage (24) communicating with the secondary compression chamber (12). An exhaust check valve (34) is provided on the first cylinder (1) and communicates with the first piston chamber; The first check valve (31) is provided on the first-stage air passage (23) and located in the first-stage compression chamber (11); The second check valve (32) is provided on the secondary air passage (24) and located in the secondary compression chamber (12); When the first piston ring (21) moves toward the secondary compression chamber (12), air enters the primary compression chamber (11) through the primary air passage (23) and the first check valve (31), and the air in the secondary compression chamber (12) is discharged through the exhaust check valve (34). When the first piston ring (21) moves toward the first-stage compression chamber (11), the air in the first-stage compression chamber (11) enters the second-stage compression chamber (12) through the second-stage air passage (24) and the second check valve (32).

7. A two-stage electric air compressor for automobiles according to claim 6, characterized in that, Also includes: The third check valve (33) is located at one end of the secondary air passage (24) and on the first piston ring (21). The second check valve (32) is located at the other end of the secondary air passage (24) and on the first piston rod (22).

8. A two-stage electric air compressor for automobiles according to claim 6, characterized in that, Also includes: The first sealing ring (41) is disposed on the first piston ring (21) and is movably inserted into the first piston cavity; The second sealing ring (42) is disposed on the first piston rod (22) and is movably inserted into the first communicating cavity (15).

9. A two-stage electric air compressor for automobiles according to claim 6, characterized in that, Also includes: The first guide ring (43) is disposed on the first piston ring (21) and is movably inserted into the first piston cavity; The second guide ring (44) is disposed on the first piston rod (22) and is movably inserted into the first communicating cavity (15).

Images