Air compressor

Abstract

The application relates to an air compressor which comprises an air storage tank, a cylinder assembly connected to the air storage tank, a motor assembly accommodated in the cylinder assembly and a transmission assembly connected to the motor assembly, the motor assembly drives the transmission assembly to reciprocate in the cylinder assembly, so that external air is compressed by the cylinder assembly and stored in the air storage tank; the transmission assembly comprises a piston assembly, a connecting rod assembly connected to the piston assembly and an eccentric wheel rotatably installed on the connecting rod assembly, and the eccentric wheel is connected to the motor assembly; the eccentric wheel comprises a first eccentric part and a second eccentric part; a balance slider assembly is arranged in the transmission assembly, the balance slider assembly intermittently provides inertial force for the second eccentric part, balances the air pressure force borne by the piston assembly 31 in the whole cycle, improves the vibration of the air compressor and has a clever structure.

Description

[Technical Field]

[0001] This invention relates to an air compressor, and more particularly to an air compressor used in decoration, construction and other applications. [Background Technology]

[0002] An air compressor is an industrial device used to compress gases. It consists of an air tank, a cylinder assembly connected to the air tank, a motor housed within the cylinder assembly, and a transmission assembly connected to the motor. The motor drives the transmission assembly to reciprocate within the cylinder assembly, compressing outside air and storing it in the air tank. During operation, the reciprocating motion of the piston causes vibration, resulting in a less comfortable grip for the user.

[0003] For improvements to existing technologies, refer to Chinese Invention Patent No. CN105089974B, published on October 17, 2017, which discloses a dual-cylinder air compressor. Balance wheels are installed at both ends of the motor shaft, and the center of the balance flange on the balance wheel is directly opposite the center of the eccentric wheel, located on opposite sides of the motor shaft. This partially counteracts the inertial force of the air compressor when unloaded, thus improving the user's feel. However, for air compressors with a certain capacity air tank, there is no completely unloaded operating condition. As soon as the air compressor is turned on, the air tank begins to store pressurized gas. When the air compressor is working, the cylinder outlet is not connected to the atmosphere. Therefore, the piston mechanism actually experiences a certain amount of air pressure, and the air pressure on the piston increases with the increase of the air pressure inside the tank. If the above-mentioned reverse balancing method is used, the vibration will actually increase.

[0004] Therefore, it is indeed necessary to provide an improved air compressor to overcome the shortcomings of the existing technology. [Summary of the Invention]

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an air compressor with low vibration and good user experience.

[0006] The technical solution adopted by this invention to solve the problems of the prior art is as follows: an air compressor, comprising an air tank, a cylinder assembly connected to the air tank, a motor assembly housed within the cylinder assembly, and a transmission assembly connected to the motor assembly. The motor assembly drives the transmission assembly to reciprocate within the cylinder assembly, thereby compressing and storing external air into the air tank via the cylinder assembly. The transmission assembly includes a piston assembly, a connecting rod assembly connected to the piston assembly, and an eccentric wheel rotatably mounted on the connecting rod assembly. The eccentric wheel is connected to the motor assembly. The eccentric wheel includes a first eccentric portion and a second eccentric portion. The transmission assembly further includes a balance slider assembly movably connected to the eccentric wheel. The first eccentric portion is connected to the connecting rod assembly, and the second eccentric portion is connected to the balance slider assembly. The first eccentric portion drives the connecting rod assembly and the piston assembly to reciprocate, and the second eccentric portion drives the balance slider assembly to move. The balance slider assembly intermittently provides inertial force to the second eccentric portion.

[0007] A further improvement is that the eccentric phase difference between the first eccentric part and the second eccentric part is 0°.

[0008] A further improvement is as follows: the motor assembly includes a motor and an output shaft that outputs power to the motor, and the first eccentric part and the second eccentric part are coaxially disposed on the output shaft.

[0009] A further improvement is as follows: when the piston assembly moves from the top dead center to the bottom dead center, the rotation angle of the eccentric wheel changes from 0° to 180°; when the piston assembly moves from the bottom dead center to the top dead center, the rotation angle of the eccentric wheel changes from 180° to 360°.

[0010] A further improvement is as follows: the balance slider assembly includes a slider movably connected to the second eccentric part, a slider seat accommodating the slider, a counterweight movably connected to the slider seat, a coil that can be switched on and off, and a magnet disposed near the coil. The coil is wound around at least one of the slider and the counterweight, and the magnet is fixed to the other of the slider and the counterweight.

[0011] A further improvement is as follows: the slider and the counterweight move up and down relative to the slider seat, and the slider moves left and right relative to the eccentric wheel.

[0012] A further improvement is as follows: The balance slider assembly includes a position sensor for detecting the eccentric wheel and a controller for controlling the on / off state of the coil current. When the rotation angle of the eccentric wheel is 0° to 90° and 270° to 360°, the coil is energized to generate a magnetic field that attracts the magnet, and the slider and the counterweight are combined, providing inertial force to the second eccentric part. When the rotation angle of the eccentric wheel is 90° to 270°, the coil is de-energized, the magnet is detached from the coil, the slider and the counterweight separate, and only the slider provides inertial force to the second eccentric part.

[0013] A further improvement is as follows: the slider includes a laterally extending connecting hole, the second eccentric portion passes through the connecting hole, and the height of the connecting hole is greater than the height of the second eccentric portion and less than the height of the first eccentric portion.

[0014] A further improvement is as follows: the slider seat includes a first mounting part and a second mounting part, the first mounting part at least partially accommodating the slider, the second mounting part at least partially accommodating the counterweight, the depth of the first mounting part being greater than the height of the slider, and the depth of the second mounting part being greater than the difference between the depth of the first mounting part and the height of the slider.

[0015] A further improvement is as follows: the counterweight includes a downwardly extending protrusion, which is movably disposed within the second mounting portion, and the height of the protrusion is equal to the depth of the second mounting portion.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the piston assembly experiences varying air pressure during its movement cycle. By setting the balance slider assembly on one side of the eccentric wheel, the balance slider assembly intermittently provides inertial force to the second eccentric part. This inertial force cancels out the air pressure, improving the vibration of the air compressor during operation and enhancing the user experience. By setting the eccentric phase difference between the first eccentric part and the second eccentric part to 0°, it is beneficial to balance the downward air pressure experienced by the piston assembly when the air compressor is unloaded. The coil is wound around at least one of the slider and the counterweight, and the magnet is fixed to the other of the slider and the counterweight. By controlling the on / off state of the coil current, the magnet engages or disengages, effectively enabling the balance slider assembly to intermittently provide inertial force to the eccentric wheel to balance the air pressure experienced by the piston assembly throughout the entire cycle, thus improving the vibration of the air compressor. Furthermore, the structure is ingenious. [Image Description]

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1This is a schematic diagram of the overall structure of the air compressor of the present invention;

[0019] Figure 2 yes Figure 1 A partial structural diagram of the air compressor shown.

[0020] Figure 3 yes Figure 1 A partial structural cross-sectional view of the air compressor shown.

[0021] Figure 4 yes Figure 1 An exploded view of the transmission components in the air compressor shown.

[0022] Figure 5 yes Figure 4 The diagram shown is a structural schematic of the transmission assembly in the air compressor in its first state.

[0023] Figure 6 yes Figure 4 The diagram shows the structure of the transmission assembly in the air compressor in the second state.

[0024] Figure 7 yes Figure 4 The diagram shows the structure of the transmission assembly in the air compressor in the third state.

[0025] Figure 8 yes Figure 4 The diagram shows the structure of the transmission assembly in the air compressor in the fourth state.

[0026] Meaning of the reference numerals in the diagram:

[0027] Air compressor 100 cylinder assembly 1

[0028] Cylinder block 11, Housing 12

[0029] Motor assembly 2, Motor 21

[0030] Output shaft 22 Fan 23

[0031] Transmission assembly 3 Piston assembly 31

[0032] Piston head 311, piston ring 312, pressure plate 313, connecting rod assembly 32

[0033] 321 Connecting rod body; 322 Connecting hole; 33 Bearing; 34 Eccentric wheel

[0034] First eccentric part 341 Second eccentric part 342 Balance slider assembly 35 Slider 351 Connecting hole 3511 Slider guide groove 3512 Winding groove 3513 Slider seat 352 First mounting part 3521 Second mounting part 3522 Counterweight 353 Protrusion 3531 Counterweight guide groove 3532 Coil 354

[0035] Magnet 355 Control Component 4

[0036] Gas storage tank 5, rollers 6

[0037] 7 support feet, 8 handles

[0038] Pipeline 9 [Detailed Implementation]

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0040] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0041] Please see Figure 1 and Figure 2 As shown, the present invention relates to an air compressor 100, the air compressor 100 including an air tank 5, a cylinder assembly 1 and a control assembly 4 disposed above the air tank 5, a motor assembly 2 housed in the cylinder assembly 1 and a transmission assembly 3 connected to the motor assembly 2, rollers 6 and support feet 7 installed at the bottom of the air tank 5, a handle 8 fixed to the left side of the air tank 5 near the edge, and a pipe 9 connecting the cylinder assembly 1 and the air tank 5. The cylinder assembly 1 and the control assembly 4 are located at the upper ends of the air tank 5, the rollers 6 and the support feet 7 are also distributed at the lower ends of the air tank 5, and the support feet 7 and the handle 8 are both located on the left side of the air tank 5. In actual operation, the user only needs to pull the handle 8 upward to lift the support foot 7 off the ground, and then the air compressor 100 can be moved in the front and back direction via the roller 6; when the air compressor 100 is stationary on the ground, the support foot 7 can restrict the movement of the roller 6, and the support foot 7 can also play a certain role in vibration reduction.

[0042] Preferably, the bottom of the support foot 7 is provided with a rubber sleeve to further enhance the vibration reduction effect of the air compressor 100 and limit the movement of the roller 6.

[0043] Please see Figure 2 As shown, the motor assembly 2 drives the transmission assembly 3 to reciprocate within the cylinder assembly 1, so as to compress external air through the cylinder assembly 1 and transport it through the pipe 9 to the air storage tank 5.

[0044] Please see Figure 3 As shown, the cylinder assembly 1 includes a cylinder body 11 for compressing gas and a housing 12 housing the motor assembly and transmission assembly. The motor assembly 2 includes a motor 21 providing power, an output shaft 22 extending towards the left and right ends of the motor 21, and fans 23 mounted on the left and right ends of the output shaft 22. The output shaft 22 outputs the power from the motor 21 and is supported within the housing 12 by bearings. The arrangement of the fans 23 helps to improve the heat dissipation efficiency of the air compressor 100 and improve the operating range of the air compressor 100.

[0045] Specifically, the transmission assembly 3 includes a piston assembly 31, a connecting rod assembly 32 connected to the piston assembly 31, and an eccentric wheel 34 rotatably mounted on the connecting rod assembly 32. The eccentric wheel 34 is fixedly connected to the output shaft 22. The piston assembly 31 includes a piston head 311 disposed within the cylinder 11. A piston ring 312 and a pressure plate 313 are connected to the end face of the piston head 311. The sidewall of the piston ring 312 mates with and seals against the inner wall of the cylinder 11. The pressure plate 313 is fixed to the piston head 311 by screws. The connecting rod assembly 32 includes a connecting rod body 321 connecting the piston head 311 and a through connecting hole 322. The eccentric wheel 34 is mounted into the connecting hole 322 via a bearing 33.

[0046] Please see Figure 3 and Figure 4As shown, the eccentric wheel 34 includes a first eccentric part 341 and a second eccentric part 342. The transmission assembly 3 also includes a balance slider assembly 35 movably connected to the eccentric wheel 34. The first eccentric part 341 is connected to the connecting rod assembly 32, and the second eccentric part 342 is connected to the balance slider assembly 35. The first eccentric part 341 drives the connecting rod assembly 32 and the piston assembly 31 to reciprocate. The second eccentric part 342 drives the balance slider assembly 35 to move. The balance slider assembly 35 intermittently provides inertial force to the second eccentric part 342. Since the air pressure on the piston assembly 31 varies during the movement cycle, the inertial force intermittently provided by the balance slider assembly 35 can cancel out the changing air pressure, improving the vibration of the air compressor 100 during operation and enhancing the user experience.

[0047] Furthermore, the eccentric phase difference between the first eccentric part 341 and the second eccentric part 342 is 0°. The first eccentric part 341 and the second eccentric part 342 are coaxially arranged on the output shaft 22, which is beneficial for balancing the downward air pressure on the piston assembly 31 when the air compressor 100 is unloaded, and the structure is simple and ingenious.

[0048] In this embodiment, when the piston assembly 31 moves from top dead center to bottom dead center, it is in the clearance expansion stage and the intake stage, during which the rotation angle of the eccentric wheel 34 changes from 0° to 180°; when the piston assembly 31 moves from bottom dead center to top dead center, it is in the compression stage and the exhaust stage, during which the rotation angle of the eccentric wheel 34 changes from 180° to 360°. The rotation of the eccentric wheel 34 from 0° to 360° constitutes one motion cycle of the piston assembly 31.

[0049] Please see Figure 4 As shown, the balance slider assembly 35 includes a slider 351 movably connected to the second eccentric portion 342, a slider seat 352 accommodating the slider 351, a counterweight 353 movably connected to the slider seat 352, a coil 354 capable of being switched on and off, and a magnet 355 disposed near the coil 354. The coil 354 is wound around at least one of the slider 351 and the counterweight 353, and the magnet 355 is fixed to the other of the slider 351 and the counterweight 353.

[0050] In this embodiment, the coil 354 is wound in the winding groove 3513 of the slider 351, and the magnet 355 is fixed to the counterweight 353. The magnet 355 can increase the weight of the counterweight 353, thereby improving the balance effect and reducing the vibration of the air compressor 100.

[0051] Specifically, the slider 351 is provided with a slider guide groove 3512, and the counterweight 353 is provided with a counterweight guide groove 3532. The slider 351 and the counterweight 353 can move along the slider guide groove 3512 and the counterweight guide groove 3532, respectively. Both guide grooves can be limited by pins fixed to the housing 12. The slider seat 352 is fixedly connected to the housing 12. The slider 351 and the counterweight 353 can move up and down relative to the slider seat 352, and the slider 351 can move left and right relative to the eccentric wheel 34. The structure is ingenious and the connection is reliable.

[0052] Please combine Figure 5 As shown, the slider 351 includes a laterally extending connecting hole 3511. The second eccentric portion 342 passes through the connecting hole 3511. The height of the connecting hole 3511 is greater than the height of the second eccentric portion 342 and less than the height of the first eccentric portion 341. Preferably, the height of the connecting hole 3511 is slightly greater than the height of the second eccentric portion 342, so that the second eccentric portion 342 just matches the connecting hole 3511, and the second eccentric portion 342 can move left and right within the connecting hole 3511.

[0053] Furthermore, the slider seat 352 includes a first mounting portion 3521 and a second mounting portion 3522. The first mounting portion 3521 at least partially accommodates the slider 351, and the second mounting portion 3522 at least partially accommodates the counterweight 353. The depth of the first mounting portion 3521 is greater than the height of the slider 351, and the depth of the second mounting portion 3522 is greater than the difference between the depth of the first mounting portion 3521 and the height of the slider 351, so that there is a certain gap between the slider 351 and the counterweight 353 when they are separated, thereby ensuring that the slider 351 acts on the eccentric wheel 34 alone under a specific state.

[0054] In this embodiment, the counterweight 353 includes a downwardly extending protrusion 3531, which is movably disposed within the second mounting portion 3522. The height of the protrusion 3531 is equal to the depth of the second mounting portion 3522. The second mounting portion 3522 serves as a guide and also supports the counterweight 353 when the slider 351 needs to be separated from the counterweight 353.

[0055] Furthermore, the balance slider assembly 35 includes a position sensor for detecting the eccentric wheel 34 and a controller for controlling the current flow of the coil 354. When the rotation angle of the eccentric wheel is 0° to 90° and 270° to 360°, the coil 354 is energized; when the rotation angle of the eccentric wheel is 90° to 270°, the coil 354 is de-energized.

[0056] Please see Figures 5 to 8 As shown, when the rotation angle of the eccentric wheel increases from 0° to 90°, the piston assembly 31 is in the clearance expansion stage, and the piston assembly 31 is subjected to downward air pressure. As the rotation angle increases, the air pressure gradually decreases until it reaches 0. When the rotation angle of the eccentric wheel increases from 270° to 360°, the piston assembly 31 is in the compression and exhaust stage, and the piston assembly 31 is subjected to downward air pressure. As the rotation angle increases, the air pressure gradually increases. In both states, the controller receives the signal from the position sensor and controls the coil 354 to be energized. The coil 354 generates a magnetic field that attracts the magnet 355. The slider 351 and the counterweight 353 combine, providing inertial force to the second eccentric part 342. Because the counterweight 353 and the magnet 355 have large masses, their inertial force is also large, which can balance the downward air pressure on the piston assembly 31. When the rotation angle of the eccentric wheel increases from 0° to 90°, the upward component of the inertial force decreases as the rotation angle increases, which just balances the gradually decreasing air pressure. When the rotation angle of the eccentric wheel increases from 270° to 360°, the upward component of the inertial force increases as the rotation angle increases, which just balances the gradually increasing air pressure. The balancing effect is better, which enhances the user experience.

[0057] Please see Figures 6 to 8 As shown, when the rotation angle of the eccentric wheel changes from 90° to 180°, the piston assembly 31 is in the intake stage, and the air pressure it receives is 0. When the rotation angle of the eccentric wheel changes from 180° to 270°, the piston assembly 31 is in the initial stage of compression, and the air pressure it receives is relatively small. In both of these states, the controller receives a signal from the position sensor and controls the coil 354 to be de-energized. The magnet 355 disengages from the coil 354, and the slider 351 and the counterweight 353 separate. Only the slider 351 provides inertial force to the second eccentric part 342. The slider 351 is made of lightweight material, so its mass is small, and its inertial force is also small, resulting in a small resultant force of inertial force and air pressure, and a better balance effect. Therefore, throughout the entire motion cycle of the piston assembly 31, the air pressure received by the piston assembly 31 can always be well balanced by the inertial force provided by the balancing slider assembly 35. The vibration and noise of the air compressor 100 are significantly reduced, and it is beneficial to increase the bearing life.

[0058] Furthermore, the motor assembly 2 is provided with two transmission assemblies 3 at both ends. The rotation angle difference between the two eccentric wheels 34 is always 180°. During the reciprocating motion, the transmission assembly 3 will generate an axial vibration force relative to the output shaft 22. The axial vibration forces at both ends are exactly equal in magnitude and opposite in direction. Therefore, during operation, the two vibration forces basically cancel each other out, which makes the air compressor 100 less noisy and less vibrating, and also helps to increase the life of the bearings.

[0059] In this invention, the piston assembly 31 experiences varying air pressures during its movement cycle. By providing a balance slider assembly 35 on one side of the eccentric wheel 34, the balance slider assembly 35 intermittently provides inertial force to the second eccentric part 342. This inertial force cancels out the air pressure, improving the vibration of the air compressor 100 during operation and enhancing the user experience. Furthermore, by setting the eccentric phase difference between the first eccentric part 341 and the second eccentric part 342 to 0°, it facilitates balancing the piston assembly 31 under no-load conditions. The piston assembly 31 is subjected to downward air pressure; the coil 354 is wound around at least one of the slider 351 and the counterweight 353, and the magnet 355 is fixed to the other of the slider 351 and the counterweight 353. By controlling the on and off of the current in the coil 354, the magnet 355 engages or disengages, effectively enabling the balance slider assembly 35 to intermittently provide inertial force to the eccentric wheel 34 to balance the air pressure on the piston assembly 31 throughout the cycle, thereby improving the vibration of the air compressor and demonstrating an ingenious structure.

[0060] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions for the air compressor of this invention can be found without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. An air compressor, comprising an air tank, a cylinder assembly connected to the air tank, a motor assembly housed within the cylinder assembly, and a transmission assembly connected to the motor assembly, wherein the motor assembly drives the transmission assembly to reciprocate within the cylinder assembly to compress and store external air into the air tank via the cylinder assembly; the transmission assembly comprises a piston assembly, a connecting rod assembly connected to the piston assembly, and an eccentric wheel rotatably mounted on the connecting rod assembly, the eccentric wheel being connected to the motor assembly; characterized in that: The eccentric wheel includes a first eccentric part and a second eccentric part. The transmission assembly also includes a balance slider assembly movably connected to the eccentric wheel. The first eccentric part is connected to the connecting rod assembly, and the second eccentric part is connected to the balance slider assembly. The first eccentric part drives the connecting rod assembly and the piston assembly to reciprocate. The second eccentric part drives the balance slider assembly to move. The balance slider assembly intermittently provides inertial force to the second eccentric part. The balance slider assembly includes a slider movably connected to the second eccentric part, a slider seat accommodating the slider, a counterweight movably connected to the slider seat, a coil that can be switched on and off, a magnet disposed near the coil, a position sensor for detecting the eccentric wheel, and a controller for controlling the current switching of the coil. The coil is wound around at least one of the slider and the counterweight, and the magnet is fixed to the other of the slider and the counterweight. When the rotation angle of the eccentric wheel is 0° to 90° and 270° to 360°, the coil is energized to generate a magnetic field that attracts the magnet. The slider and the counterweight are combined, and the slider and the counterweight provide inertial force for the second eccentric part. When the rotation angle of the eccentric wheel is 90° to 270°, the coil is de-energized, the magnet is detached from the coil, the slider and the counterweight are separated, and only the slider provides inertial force for the second eccentric part.

2. The air compressor according to claim 1, characterized in that: The eccentric phase difference between the first eccentric part and the second eccentric part is 0°.

3. The air compressor according to claim 1, characterized in that: The motor assembly includes a motor and an output shaft that outputs power to the motor, wherein the first eccentric portion and the second eccentric portion are coaxially disposed on the output shaft.

4. The air compressor according to claim 1, characterized in that: When the piston assembly moves from the top dead center to the bottom dead center, the rotation angle of the eccentric wheel changes from 0° to 180°. When the piston assembly moves from the bottom dead center to the top dead center, the rotation angle of the eccentric wheel changes from 180° to 360°.

5. The air compressor according to claim 4, characterized in that: The slider and the counterweight move up and down relative to the slider seat, and the slider moves left and right relative to the eccentric wheel.

6. The air compressor according to claim 4, characterized in that: The slider includes a laterally extending connecting hole, through which the second eccentric portion passes. The height of the connecting hole is greater than the height of the second eccentric portion and less than the height of the first eccentric portion.

7. The air compressor according to claim 4, characterized in that: The slider seat includes a first mounting portion and a second mounting portion. The first mounting portion at least partially accommodates the slider, and the second mounting portion at least partially accommodates the counterweight. The depth of the first mounting portion is greater than the height of the slider, and the depth of the second mounting portion is greater than the difference between the depth of the first mounting portion and the height of the slider.

8. The air compressor according to claim 7, characterized in that: The counterweight includes a downwardly extending protrusion, which is movably disposed within the second mounting portion, and the height of the protrusion is equal to the depth of the second mounting portion.

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