A multi-cylinder oil-free piston air compressor

Abstract

The present invention relates to the field of air compressors, and in particular to a multi-cylinder oil-free piston air compressor, comprising a motor arranged on a base, a cooling fan and a crank connected to the motor, wherein the crank is arranged inside a housing, and a hinge shaft on the crank is connected to a piston device inside a cylinder through a connecting rod, a cylinder cover is arranged outside the cylinder, and a support unit is arranged inside the housing, wherein the support unit is used to connect the hinge shaft of the crank and the inner wall of the housing so that both ends of the hinge shaft of the crank are supported by force; the output shaft of the motor and the cooling fan are detachably connected, and the cooling fan is connected to the crank shaft in the housing. The present invention enables the multi-cylinder air compressor to work stably, effectively reduces the pressure on the motor output shaft, reduces the probability of motor damage, and increases the service life of the equipment, and the motor, cylinder, and fan parts are designed to be separated, so that the motor can be repaired and replaced without complicated disassembly operations.

Description

Technical Field

[0001] The invention relates to the field of air compressors, in particular to a multi-cylinder oil-free piston air compressor. Background Art

[0002] The existing air compressor mainly includes components such as a motor, a cooling fan, a cylinder, and a crank mechanism for driving the cylinder to move. Among them, the patent with application number CN2017106220314 discloses an air compressor, and its invention content mainly utilizes the motor shaft to synchronously drive the cooling fan to dissipate heat to the cylinder and the cylinder head. However, in this patent, the output shaft of the motor is directly connected to the crank, and the cooling fan is also connected to the motor output shaft. This brings about the following problems: the motor shaft will bear the pressure brought by the crank part and the fan part. Especially when the number of cylinders is three or more, the motor shaft will be easily damaged due to the excessive pressure. When the motor is damaged, the motor needs to be repaired and replaced. In the prior art, because the output shaft of the motor directly passes through the cooling fan and the crank connection, the cylinder head and the cooling fan part of the cylinder need to be completely disassembled to repair and replace the motor, and the operation is very cumbersome. Summary of the invention

[0003] The present invention provides a multi-cylinder oil-free piston air compressor. By reasonably improving the existing structure, the multi-cylinder air compressor can work stably, effectively reducing the pressure on the motor output shaft, reducing the probability of motor damage, and increasing the service life of the equipment. In addition, the motor and cylinder and fan parts adopt a separate design, and the motor can be repaired and replaced without complicated disassembly operations, which facilitates the repair of the equipment and solves the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a multi-cylinder oil-free piston air compressor, comprising a motor arranged on a base, a cooling fan and a crank connected to the motor, the crank being arranged inside a shell, the hinge shaft on the crank being connected to the piston device inside the cylinder through a connecting rod, a cylinder cover being provided outside the cylinder, and a support unit being provided inside the shell, the support unit being used to connect the hinge shaft of the crank and the inner wall of the shell so that both ends of the hinge shaft of the crank are supported by force; the output shaft of the motor and the cooling fan are detachably connected, and the cooling fan is connected to the crank shaft in the shell.

[0005] Preferably, the support unit includes a connecting portion rotatably connected to the end of the hinge shaft, the connecting portion is connected to the inner wall of the shell via a support bearing, and the connecting portion is coaxially arranged along the rotation center of the support bearing and the rotation center of the crank eccentric wheel.

[0006] Preferably, the connecting portion comprises a driven disk, and the driven disk and the hinge shaft are movably hinged to each other.

[0007] Preferably, the connecting portion comprises a driven connecting rod, and the driven connecting rod and the hinge shaft are movably hinged to each other.

[0008] Preferably, the output shaft of the motor is connected to the cooling fan via a coupling.

[0009] Preferably, the shell is supported on the top of the base.

[0010] Preferably, the bottom of the shell is connected to the base via a support seat.

[0011] Preferably, a groove is provided on the base relative to the position of the heat dissipation fan.

[0012] Preferably, a wind shield is provided outside the heat dissipation fan, and the wind shield is supported and provided in the groove of the base.

[0013] Preferably, the support seat is connected to the base by bolts, and the vertical section of the wind shield relative to the shell is connected to the side wall of the shell by bolts.

[0014] The beneficial effect of the above-mentioned structure adopted in the present invention is that, through reasonable improvement of the existing structure, the multi-cylinder air compressor can work stably, effectively reduce the pressure on the motor output shaft, reduce the probability of motor damage, and increase the service life of the equipment. In addition, the motor and cylinder and fan parts adopt a separate design, and the motor can be repaired and replaced without complicated disassembly operations, which facilitates the maintenance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is an enlarged structural schematic diagram of the shell part of the present invention.

[0017] In the figure, 1. base; 2. motor; 3. cooling fan; 4. crank; 5. housing; 6. hinge shaft; 7. cylinder head; 8. connecting part; 9. support bearing; 10. coupling; 11. support seat; 12. groove; 13. wind shield. DETAILED DESCRIPTION

[0018] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0019] like Figure 1-2As shown, a multi-cylinder oil-free piston air compressor includes a motor 2 arranged on a base 1, a cooling fan 3 and a crank 4 connected to the motor 2, the crank 4 is arranged inside a shell 5, an articulated shaft 6 on the crank 4 is connected to a piston device inside the cylinder through a connecting rod, a cylinder cover 7 is provided outside the cylinder, and a supporting unit is provided inside the shell 5, the supporting unit is used to connect the articulated shaft 6 of the crank 4 and the inner wall of the shell 5, so that both ends of the articulated shaft 6 of the crank 4 are supported by force; the output shaft of the motor 2 and the cooling fan 3 are detachably connected, and the cooling fan 3 is connected to the rotating shaft of the crank 4 in the shell 5.

[0020] The present invention supports the hinged shaft of the eccentric wheel of the crank 4 through a support unit. The crank 4 part, the cylinder and the cylinder head all belong to the prior art and are simply illustrated in the accompanying drawings and are not described in detail herein. In the prior art, the eccentric wheel part of the crank 4 can only be supported by the output shaft of the motor 2, while the support unit in the present invention can support both ends of the hinged shaft 6 of the eccentric wheel of the crank 4, so that the originally suspended end of the hinged shaft 6 is connected to the inner wall of the shell 5 through the support unit, effectively reducing the pressure on the output shaft of the motor 2. At the same time, the output shaft of the motor 2 and the cooling fan 3 are connected in a detachable manner, which is different from the traditional direct connection method in which the output shaft of the motor 2 passes through the cooling fan 3 and is directly connected to the crank 4 inside the shell 5. This facilitates the maintenance and replacement of the motor 2 without disassembling the cylinder and the shell 5.

[0021] Because the hinge shaft on the crank eccentric wheel rotates eccentrically following the rotation of the eccentric wheel, in order to enable the support device to follow the movement trajectory of the eccentric wheel, the support unit includes a connecting part 8 rotatably connected to the end of the hinge shaft 6, and the connecting part 8 is connected to the inner wall of the shell 5 via a support bearing 9. The connecting part 8 is coaxially arranged along the rotation center of the support bearing 9 and the rotation center of the crank 4 eccentric wheel.

[0022] In order to facilitate connection with the end of the articulated shaft, the connecting portion 8 includes a driven disk, and the driven disk and the articulated shaft 6 are movably articulated.

[0023] In order to facilitate the connection with the end of the hinge shaft, the connecting portion 8 includes a driven connecting rod, and the driven connecting rod and the hinge shaft 6 are movably hinged.

[0024] In order to realize the detachable connection between the motor 2 and the cooling fan 3, the output shaft of the motor 2 is connected to the cooling fan 3 via the coupling 10. When the motor 2 needs to be repaired or replaced, the motor 2 can be easily disassembled by simply removing the coupling 10, which is convenient and quick to operate.

[0025] In order to further reduce the pressure on the motor output shaft, the housing 5 is supported on the top of the base 1. The weight of the entire housing 5 and the cylinder head part is supported by the base 1, which is more scientific and reasonable.

[0026] In order to facilitate the connection between the shell 5 and the base 1 , the original standard processing size of the equipment results in a certain distance between the bottom of the shell 5 and the base 1 , and the bottom of the shell 5 is connected to the base 1 via the support seat 11 .

[0027] In order to increase the stability of the entire device and reduce the height of the device from the base 1, the base 1 hinders the rotation of the cooling fan 3. To solve this problem, a groove 12 is provided on the base 1 relative to the cooling fan 3.

[0028] In order to further reduce the pressure on the output shaft of the motor 2 from the cooling fan 3, a wind shield 13 is provided outside the cooling fan 3, and the wind shield 13 is supported and provided in the groove 12 of the base 1. In the prior art, the wind shield 13 of the cooling fan 3 is suspended, which brings a burden to the output shaft of the motor 2. The wind shield 13 is set in the groove, so that the groove 12 of the base 1 supports and fixes the wind shield, thereby reducing the burden on the output shaft of the motor.

[0029] In order to facilitate the installation and fixation of the support base 11, the support base 11 is connected to the base 1 with bolts, and in order to increase the connection stability of the wind shield 13, the vertical section of the wind shield 13 relative to the shell 5 is connected to the side wall of the shell 5 with bolts. The bottom of the wind shield 13 is arranged inside the groove 12 and connected to the shell 4, which improves the stability and reliability of the connection of the wind shield 13. At this time, the wind shield 13 can be a plastic wind shield, which reduces the quality of the wind shield 13 itself and reduces the cost of the wind shield 13 while ensuring the function of the wind shield 13.

[0030] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any substitution, improvement or change made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0031] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A multi-cylinder oil-free piston air compressor, comprising a motor arranged on a base, a cooling fan and a crank connected to the motor, wherein the crank is arranged inside a housing, a hinge shaft on the crank is connected to a piston device inside a cylinder through a connecting rod, and a cylinder cover is arranged outside the cylinder, characterized in that: A support unit is provided in the shell, and the support unit is used to connect the hinge shaft of the crank and the inner wall of the shell, so that both ends of the hinge shaft of the crank are supported by force; the output shaft of the motor and the cooling fan are detachably connected, and the cooling fan is connected to the crank shaft in the shell; The support unit includes a connecting portion rotatably connected to the end of the articulated shaft, the connecting portion is connected to the inner wall of the housing via a supporting bearing, and the connecting portion is coaxially arranged along the rotation center of the supporting bearing and the rotation center of the crank eccentric wheel; the connecting portion includes a driven plate, the driven plate and the articulated shaft are movably articulated; the connecting portion includes a driven connecting rod, the driven connecting rod and the articulated shaft are movably articulated; The output shaft of the motor is connected to the cooling fan via a coupling; The housing is supported on the top of the base; The bottom of the shell is connected to the base via a support seat; A groove is provided on the base relative to the position of the heat dissipation fan; A wind shield is provided outside the heat dissipation fan, and the wind shield is supported and provided in the groove of the base; The support seat is connected to the base with bolts, and the vertical section of the wind shield relative to the shell is connected to the side wall of the shell with bolts; The wind shield is made of plastic.

Images