Air compressor

Abstract

The utility model provides an air compressor, and belongs to the technical field of air compressors. The single-head four-cylinder air compressor solves the problems that an existing single-head four-cylinder air compressor is large in vibration and noise in the working process. The air compressor comprises a main shaft, two first connecting rod assemblies and two second connecting rod assemblies, the two first connecting rod assemblies and the two second connecting rod assemblies are distributed around the main shaft in a crossed mode, the front end of the main shaft is sleeved with a first crank and a second crank, the first crank comprises two first eccentric wheels, and the second crank comprises two second eccentric wheels. The two first connecting rod assemblies are arranged on the corresponding first eccentric wheels in a sleeving mode respectively, the two second connecting rod assemblies are arranged on the corresponding second eccentric wheels in a sleeving mode respectively, and after the main shaft rotates, the two first connecting rod assemblies and the two second connecting rod assemblies can extend outwards to the limiting positions at the same time or retract inwards to the limiting positions at the same time at different rotating angles respectively. According to the structure, vibration and noise of the whole machine during working are reduced, force balance is achieved, the air compressor does work twice when the main shaft rotates by one circle, and good work efficiency is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of air compressor technology, and in particular, it relates to an air compressor. Background Technology

[0002] A single-head four-cylinder air compressor is a special type of air compressor. Its core feature is the design of using a single crankshaft to drive four cylinders. It achieves high-efficiency compression through the coordinated work of multiple cylinders. This structure is widely used in the industrial field and is especially suitable for scenarios that require high displacement, stable air pressure, and long-term continuous operation.

[0003] Currently, the China Patent Network discloses a four-cylinder air compressor [Authorization Announcement No.: CN216044239U], which includes a crankcase and four air compression components. The four air compression components are arranged around the crankcase axis, and the projections of the four air compression components along the crankcase axis do not overlap. When this four-cylinder air compressor is working, the four air compression components perform work sequentially when the crankshaft rotates 360°.

[0004] The aforementioned four-cylinder air compressor has the following defects: because the four air compression components work in sequence, the four connecting rods move in different directions. That is, the main shaft needs to withstand shear forces in four different directions when it rotates, the main shaft needs to withstand a large load, the service life of the mechanical structure is short, and the unbalanced movement of the four connecting rods leads to large overall vibration and noise of the air compressor. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing an air compressor. The technical problem to be solved by this utility model is: how to solve the problem of large vibration and noise in a single-head four-cylinder air compressor during operation.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An air compressor includes a main shaft, two connecting rod assemblies (first and second), and two connecting rod assemblies (second). The two connecting rod assemblies (first and second) are arranged in a crisscross pattern around the main shaft. The two connecting rod assemblies (first and second) are positioned opposite each other on both sides of the main shaft axis, and the two connecting rod assemblies (second and third) are positioned opposite each other on both sides of the main shaft axis. The main shaft has two cranks (first and second) mounted on its front end. Each crank (first) includes two eccentric wheels (first) arranged in opposite directions around the main shaft axis. Each crank (second) is deflected relative to the cranks (first) along the rotation direction of the main shaft by an angle ∠α. The two connecting rod assemblies (first and second) are respectively mounted on their corresponding eccentric wheels (first and second). When the main shaft rotates, the two connecting rod assemblies (first and second) will extend outward to their respective limit positions or retract inward to their respective limit positions at different rotation angles.

[0008] Working principle:

[0009] In the initial state, when the two connecting rod assemblies 1 extend outward to their limit positions, the two connecting rod assemblies 2 do not extend outward to their limit positions. After the motor drives the main shaft to rotate, the main shaft drives crank 1 and crank 2 to rotate simultaneously. Crank 1 drives the two connecting rod assemblies 1 to move synchronously. Whether the two connecting rod assemblies 1 move inward or outward, the stroke of the two connecting rod assemblies 1 is the same. Similarly, the rotation of crank 2 drives the two connecting rod assemblies 2 to move synchronously. Whether the two connecting rod assemblies 1 move inward or outward, the stroke of the two connecting rod assemblies 2 is also the same. The design of this structure allows link assembly one and link assembly two to take turns performing work. During the rotation of the main shaft, because link assemblies one and two are crisscrossed around the main shaft, the main shaft is subjected to forces in four directions. Since link assemblies one maintain central symmetry throughout the motion, and their inward and outward strokes are consistent, the two opposing forces generated during the work performed by link assemblies one cancel each other out. Similarly, link assemblies two maintain central symmetry throughout the motion, and their inward and outward strokes are consistent, therefore the two opposing forces generated during the work performed by link assemblies two cancel each other out. The mutual cancellation significantly absorbs the shear force generated by the simultaneous work of the two sets of connecting rod assemblies, indirectly weakening the connecting rod shear force on the main bearing, optimizing the overall force unloading logic of the machine, reducing the load on the main bearing, and extending the service life of the mechanical structure. At the same time, the forces generated by each connecting rod assembly cancel each other out and achieve balance, which also reduces the vibration and noise of the entire machine during operation. Furthermore, the counterweight installed on the main shaft is eliminated, and the need for a counterweight to achieve force balance is eliminated, making the overall weight of the air compressor lighter. In addition, after the main shaft rotates 360°, connecting rod assembly one and connecting rod assembly two extend outward to their limit positions at two different rotation angles, that is, connecting rod assembly one and connecting rod assembly two perform work respectively, and the air compressor performs work twice for one rotation of the main shaft, ensuring good work efficiency.

[0010] In the aforementioned air compressor, 0°≤∠α≤180°. When ∠α is 0°, when the first connecting rod assembly extends outward to its limit position, the second connecting rod assembly is at the position of extending outward halfway. That is, when the main shaft rotates another 90°, the second connecting rod assembly extends outward to its limit position.

[0011] In the aforementioned air compressor, ∠α is 90°. When two connecting rod assemblies extend outward to their limit positions, two connecting rod assemblies retract inward to their limit positions. After the main shaft rotates 180°, two connecting rod assemblies extend outward to their limit positions while two connecting rod assemblies retract inward to their limit positions. Assuming that in the initial state, connecting rod assembly one extends outward to its limit position, and connecting rod assembly two retracts inward to its limit position, after the main shaft rotates 180°, connecting rod assembly one retracts inward to its limit position while connecting rod assembly two extends outward to its limit position. That is, the main shaft performs work once for every 180° rotation and twice for every 360° rotation. This is equivalent to two connecting rod assemblies one and two connecting rod assemblies taking turns performing work for every revolution of the main shaft. This distributes the load borne by the multi-cylinder, multi-crank air compressor motor as evenly as possible, making the upper limit of the motor load curve as close as possible to the lower limit of the no-load curve, thus optimizing energy consumption and reducing motor vibration and noise.

[0012] In the aforementioned air compressor, the air compressor further includes a crankcase. The front end of the main shaft passes through the crankcase. Two connecting rod assemblies and two connecting rod assemblies are located inside the crankcase. The crankcase has two cylinder seats and two cylinder seats. Each cylinder seat and each cylinder seat is equipped with a cylinder assembly. The two connecting rod assemblies are respectively assembled with the cylinder assemblies on the two cylinder seats. The two connecting rod assemblies are respectively assembled with the cylinder assemblies on the two cylinder seats. An outer axial flow fan is sleeved on the main shaft. The outer axial flow fan is located on the outer side of the crankcase end face. The axial projection of the outer axial flow fan along the main shaft can at least partially coincide with the cylinder seat or cylinder seat. After the outer axial flow fan rotates, the cooling air can blow onto the cylinder assembly. This structure features four cylinder seats on the crankcase, with their positions matching the positions of the four connecting rod assemblies. Each connecting rod assembly is fitted with its corresponding cylinder seat and cylinder assembly. The axial projection of the outer axial flow fan along the main shaft at least partially coincides with either cylinder seat one or cylinder seat two. This means the maximum outer diameter of the outer axial flow fan is larger than the port of the main shaft. When the main shaft rotates, it drives the outer axial flow fan to rotate, blowing air towards cylinder seats one and two, directly cooling all cylinder assemblies. This significantly improves heat dissipation and temperature reduction for the cylinder assemblies, extending piston lifespan.

[0013] In the aforementioned air compressor, the cylinder assembly includes a cylinder, a valve plate, and a cylinder head. The cylinder is disposed within a cylinder seat one or a cylinder seat two. The valve plate is disposed at the end of cylinder seat one or cylinder seat two, and the cylinder head is disposed on the valve plate. Both cylinder seat one and cylinder seat two have air inlets on the side facing the outer axial flow fan. The valve plate has a ventilation hole one communicating with cylinder seat one or cylinder seat two, and the cylinder head has a ventilation hole two communicating with ventilation hole one. When the outer axial flow fan rotates, cooling air is blown onto the cylinder through the air inlet and then blown outwards sequentially from ventilation hole one and ventilation hole two. After the outer axial fan blades rotate, they blow air towards the cylinder block. The cooling air enters the cylinder block one and cylinder block two through the air inlet, so that the cooling air blows directly onto the outer circumferential surface of the cylinder, directly cooling the cylinder. Then, the cooling air in the cylinder block flows through the ventilation hole one and ventilation hole two in sequence and blows outward. That is, the cooling air cools the valve plate and cylinder head, which has a very good cooling effect on the cylinder, valve plate and cylinder head.

[0014] In the aforementioned air compressor, an outlet pipe is provided in the area between cylinder seat one and cylinder seat two, and the outlet pipe is a metal pipe. This structure utilizes the area between cylinder seat one and cylinder seat two to arrange the outlet pipe. This structure uses a metal outlet pipe. The compressed gas has a certain temperature after compression, and the metal outlet pipe can absorb the heat of the compressed gas. The metal outlet pipe can be regularly arranged in the area between cylinder seat one and cylinder seat two. Cooling air blown from the outer axial fan can directly blow onto the metal outlet pipe, cooling it and thus reducing the temperature of the gas entering the air tank.

[0015] In the aforementioned air compressor, an inner axial flow fan is mounted on the main shaft, blowing air towards the interior of the crankcase. An outer axial flow fan is positioned radially outside the inner axial flow fan. Rotation of the main shaft drives the inner axial flow fan to rotate, blowing air into the crankcase to cool components such as bearings, cranks, and connecting rods. The outer axial flow fan is mounted on top of the inner axial flow fan, meaning both rotate synchronously. Furthermore, the two fan blades are integrated into a single component, resulting in a more compact structure.

[0016] In the aforementioned air compressor, the air compressor further includes a fan shroud surrounding the crankcase. The fan shroud has an air inlet end and an air outlet end. The air outlet end faces the motor and extends to the periphery of the cylinder assembly. The fan shroud covers at least a portion of the cylinder assembly. The fan shroud covers the outer axial flow fan blade and the inner axial flow fan blade. The outer wall of the fan shroud has several air inlet holes three corresponding to the position of the inner axial flow fan blade. A filter is provided on the fan shroud corresponding to the position of the air inlet holes three. The outer wall of the fan shroud has several air inlet holes four corresponding to the position of the outer axial flow fan blade. After the inner axial fan blades rotate, they dissipate heat from the components inside the crankcase. After the outer axial fan blades rotate, outside air enters the fan shroud through the air inlet and is then blown towards the cylinder assembly. In addition, the air outlet of the fan shroud extends to the periphery of the cylinder assembly, and the fan shroud also has a certain air guiding effect, guiding the cooling air blown out by the outer axial fan blades to the cylinder assembly, so that the cooling air is concentrated on the cylinder assembly, and some of the cooling air is directly blown onto the cooling fins of the cylinder head, further improving the cooling effect on the cylinder assembly. The filter plate is set so that the outside cooling air is filtered out of dust or impurities before entering the crankcase, avoiding damage to the components inside the crankcase.

[0017] In the aforementioned air compressor, a partition is provided on the side of the crankcase near the motor, cylinder seat one is located away from the motor, cylinder seat two is located near the motor, a ventilation hole five is provided in the crankcase between cylinder seat one and the motor, and a ventilation hole six is ​​provided in the cylinder seat two to connect to the inside of the crankcase. After the inner axial flow fan blades rotate, they blow cooling air into the crankcase. The cooling air inside the crankcase flows upward due to the obstruction of the baffle. Some of the cooling air flows outward from ventilation hole five, and some flows into cylinder block two from ventilation hole six, cooling the cylinder assembly inside cylinder block two. In addition, due to the large outer diameter of the outer axial flow fan blades, the cooling air blown out after the outer axial flow fan blades rotate has a high wind speed. The cooling air blown out after the outer axial flow fan blades rotate flows around the outside of the crankcase, making the wind speed around ventilation hole five faster, thus forming a siphon effect. This causes the cooling air inside the crankcase to be accelerated and drawn out of the crankcase through ventilation hole five, improving the cooling effect on the crankcase and its internal components, and thus indirectly improving the cooling effect on the motor.

[0018] In the aforementioned air compressor, crank three and crank four are fitted onto the rear end of the main shaft. Crank three includes two eccentric wheels arranged in opposite directions around the main shaft. Crank four includes two eccentric wheels arranged in opposite directions around the main shaft. Crank three is deflected by an angle ∠β relative to crank one about the direction of rotation of the main shaft, and crank four is deflected by an angle ∠θ relative to crank one about the direction of rotation of the main shaft. The air compressor also includes two connecting rod assemblies. The two connecting rod assemblies 4, 3, and 4 are arranged in a crisscross pattern around the main shaft. The two connecting rod assemblies 3 are positioned opposite each other on both sides of the main shaft axis, and the two connecting rod assemblies 4 are positioned opposite each other on both sides of the main shaft axis. The two connecting rod assemblies 3 are respectively mounted on the two eccentric wheels 3, and the two connecting rod assemblies 4 are respectively mounted on the two eccentric wheels 4. When the main shaft rotates, the two connecting rod assemblies 3 and 4 will extend outward to their limit positions or retract inward to their limit positions at different rotation angles.

[0019] In the aforementioned air compressor, cranks one, two, three, and four are arranged sequentially from front to back on the main shaft. ∠α is 90°, ∠β is 270°, and ∠θ is 0°. When the two connecting rod assemblies one extend outward to their limit positions, the two connecting rod assemblies three extend outward to their limit positions when the main shaft rotates 90°. When the main shaft rotates 180°, the two connecting rod assemblies two extend outward to their limit positions. When the main shaft rotates 270°, the two connecting rod assemblies four extend outward to their limit positions. When the main shaft rotates 360°, the two connecting rod assemblies one extend outward to their limit positions again.

[0020] Compared with the prior art, the air compressor of this utility model has the following advantages: During the rotation of the main shaft, the main shaft is subjected to forces in four directions. Since the two connecting rod assemblies 1 always maintain central symmetry during the movement, and the inward and outward strokes are consistent, the two opposing forces generated by the two connecting rod assemblies 1 cancel each other out during the work process. Similarly, the two connecting rod assemblies 2 always maintain central symmetry during the movement, and the inward and outward strokes are consistent, so the two opposing forces generated by the two connecting rod assemblies 2 cancel each other out during the work process. This significantly absorbs the shear force generated by the simultaneous work of the two sets of connecting rod assemblies, indirectly weakens the connecting rod shear force on the main bearing, optimizes the stress relief logic of the whole machine, reduces the load on the main bearing, and extends the service life of the mechanical structure. At the same time, the forces generated by each connecting rod assembly during operation cancel each other out and are balanced, which also reduces the vibration and noise of the whole machine during operation. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the connecting rod assembly of this utility model assembled on the main shaft.

[0022] Figure 2 This is an exploded structural diagram of each crank and main shaft of this utility model.

[0023] Figure 3 This is a schematic diagram of the connecting rod assembly of this utility model extending outward to its limit position.

[0024] Figure 4 This is a schematic diagram showing the position of the second link assembly when the first link assembly of this utility model extends outward to its limit position.

[0025] Figure 5 This is a schematic diagram of the position of the connecting rod assembly three when the connecting rod assembly one of this utility model extends outward to its limit position.

[0026] Figure 6 This is a schematic diagram of the position of the fourth link assembly when the first link assembly of this utility model extends outward to its limit position.

[0027] Figure 7 This is a three-dimensional structural diagram of the air compressor of this utility model after the fan cover is removed.

[0028] Figure 8 This is a cross-sectional structural diagram of the air compressor of this utility model.

[0029] Figure 9 This is an exploded structural diagram of the cylinder assembly and crankcase of this utility model.

[0030] Figure 10 This is a side view of the crankcase of this utility model.

[0031] Figure 11 This is one of the three-dimensional structural schematic diagrams of the crankcase of this utility model.

[0032] Figure 12 This is the second three-dimensional structural schematic diagram of the crankcase of this utility model.

[0033] Figure 13 This is a three-dimensional structural diagram of the air compressor of this utility model.

[0034] Figure 14 This is an exploded structural diagram of the wind shield of this utility model.

[0035] In the diagram, 1. Main shaft; 2. Motor; 3. Connecting rod assembly one; 4. Connecting rod assembly two; 5. Crank one; 6. Crank two; 50. Eccentric wheel one; 60. Eccentric wheel two; 7. Crankcase; 70. Cylinder seat one; 71. Cylinder seat two; 72. Partition plate; 73. Ventilation hole five; 74. Ventilation hole six; 8. Cylinder assembly; 80. Cylinder; 81. Valve plate; 810. Ventilation hole one; 82. Cylinder head; 82 0. Ventilation hole two; 9. Outer axial flow fan blade; 10. Air inlet; 11. Air outlet pipe; 12. Inner axial flow fan blade; 13. Fan cover; 130. Air inlet end; 131. Air outlet end; 132. Air inlet three; 133. Air inlet four; 16. Crank three; 160. Eccentric wheel three; 17. Crank four; 170. Eccentric wheel four; 18. Connecting rod assembly three; 19. Connecting rod assembly four; 20. Filter plate. Detailed Implementation

[0036] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0037] Example 1

[0038] like Figure 1 and Figure 7 As shown, this air compressor includes a main shaft 1, a motor 2 that drives the main shaft 1 to rotate, two connecting rod assemblies 3 and two connecting rod assemblies 4. The two connecting rod assemblies 3 and 4 are arranged in a cross pattern with the main shaft 1 as the center. The two connecting rod assemblies 3 are perpendicular to the axis of the main shaft 1 and are opposite each other on both sides. The two connecting rod assemblies 4 are perpendicular to the axis of the main shaft 1 and are opposite each other on both sides. Specifically, the two connecting rod assemblies 3 and 4 are centrally symmetrical with the main shaft 1 as the center. This air compressor also includes a crankcase 7. The front end of the main shaft 1 passes through the crankcase 7. Two connecting rod assemblies 3 and 4 are located inside the crankcase 7. The crankcase 7 has two cylinder seats 70 and two cylinder seats 71. Each cylinder seat 70 and each cylinder seat 71 is equipped with a cylinder assembly 8. The two connecting rod assemblies 3 are respectively assembled with the cylinder assemblies 8 on the two cylinder seats 70, and the two connecting rod assemblies 4 are respectively assembled with the cylinder assemblies 8 on the two cylinder seats 71. Both connecting rod assemblies 3 and 4 include a connecting rod and a piston. The connecting rod is sleeved on an eccentric wheel, and the piston is slidably disposed inside the cylinder.

[0039] like Figure 2 , Figure 3 and Figure 4As shown, crank 5 and crank 6 are fitted onto the front end of the main shaft 1. Crank 5 includes two eccentric wheels 50, which are arranged in opposite directions around the main shaft 1, specifically, the two eccentric wheels 50 are symmetrically arranged at 180° with the main shaft 1 as the center. Crank 6 includes two eccentric wheels 60, which are arranged in opposite directions around the main shaft 1, specifically, the two eccentric wheels 60 are symmetrically arranged at 180° with the main shaft 1 as the center. Crank 6 is eccentric relative to the rotation direction of crank 5 around the main shaft 1. The rotation angle ∠α is 0°≤∠α≤180° in this embodiment. The two connecting rod assemblies 1-3 are respectively sleeved on the corresponding eccentric wheels 1-50, and the two connecting rod assemblies 2-4 are respectively sleeved on the corresponding eccentric wheels 2-60. When the main shaft 1 rotates, the two connecting rod assemblies 1-3 and the two connecting rod assemblies 2-4 extend outward to their limit positions at different rotation angles. That is, when the main shaft 1 rotates a certain angle, the connecting rod assembly 1-3 extends outward to its limit position, and then the main shaft 1 continues to rotate a certain angle, and the connecting rod assembly 2-4 extends outward to its limit position.

[0040] In the initial state, when the two connecting rod assemblies 1 and 3 extend outward to their limit positions, the two connecting rod assemblies 2 and 4 do not extend outward to their limit positions. After the motor 2 drives the main shaft 1 to rotate, the main shaft 1 drives the cranks 1 and 2 and 6 to rotate simultaneously. The cranks 1 and 5 drive the two connecting rod assemblies 1 and 3 to move synchronously. Whether the two connecting rod assemblies 1 and 3 are moving inward or outward, their strokes are the same. That is, the two connecting rod assemblies 1 and 3 can simultaneously extend outward to their limit positions and simultaneously retract inward to their limit positions. Similarly, the rotation of the cranks 2 and 6 drives the two connecting rod assemblies 2 and 4 to move synchronously. Whether the two connecting rod assemblies 2 and 4 are moving inward or outward, their strokes are also the same. That is, the two connecting rod assemblies 2 and 4 can simultaneously extend outward to their limit positions and simultaneously retract inward to their limit positions. The design of this structure allows connecting rod assembly 3 and connecting rod assembly 4 to work alternately. During the rotation of the main shaft 1, because the two connecting rod assemblies 3 and 4 are crisscrossed around the main shaft 1, the main shaft 1 is subjected to forces in four directions. Since the two connecting rod assemblies 3 maintain central symmetry throughout their movement, and their inward and outward strokes are consistent, the two opposing forces generated during their work cancel each other out. Similarly, the two connecting rod assemblies 4 maintain central symmetry throughout their movement, and their inward and outward strokes are consistent, thus the two opposing forces generated during their work cancel each other out. This significantly absorbs the shear force generated by the simultaneous work of the two connecting rod assemblies, indirectly weakening the shear force on the main shaft 1, optimizing the overall load-bearing logic, reducing the load on the main shaft 1, and extending the lifespan of the mechanical structure. Simultaneously, the forces generated by each connecting rod assembly cancel each other out, achieving balance and reducing vibration and noise during operation.

[0041] Figure 3 The dashed line in the middle represents the axis of crankshaft 5. Figure 4 The bold dashed line represents the axis of crank 5, and the thin dashed line represents the axis of crank 6. In this embodiment, ∠α is 90°. When the two connecting rod assemblies 1 and 3 extend outward to their limit positions, the two connecting rod assemblies 2 and 4 retract inward to their limit positions. Assuming that in the initial state, connecting rod assembly 1 and 3 extend outward to their limit positions, and connecting rod assembly 2 and 4 retract inward to their limit positions, after the main shaft rotates 180°, connecting rod assembly 1 and 3 retract inward to their limit positions, and connecting rod assembly 2 and 4 extend outward to their limit positions, that is, the main shaft 1 does work once when it rotates 180°, and does work twice when it rotates 360°. This is equivalent to the two connecting rod assemblies 1 and 2 and 4 taking turns doing work when the main shaft 1 rotates one revolution, which distributes the load borne by the multi-cylinder multi-crank air compressor motor 2, making the upper limit of the load curve of motor 2 as close as possible to the lower limit of the no-load curve and making it smoother, thus optimizing energy consumption and optimizing the vibration and noise of motor 2.

[0042] like Figures 7-13 As shown, an inner axial flow fan 12 is fitted on the main shaft 1. The inner axial flow fan 12 can blow air into the crankcase 7. An outer axial flow fan 9 is set on the inner axial flow fan 12. Specifically, the inner axial flow fan 12 has an annular mounting ring. The outer axial flow fan 9 is set on the outer circumferential surface of the mounting ring. The outer axial flow fan 9 is located outside the crankcase 7. The axial projection of the outer axial flow fan 9 along the main shaft 1 can at least partially coincide with the cylinder block 70 or the cylinder block 71. After the outer axial flow fan 9 rotates, the cooling air can blow onto the cylinder assembly 8. The cylinder assembly 8 includes a cylinder 80, a valve plate 81, and a cylinder head 82. The cylinder 80 is disposed in a cylinder seat 70 or a cylinder seat 71. The valve plate 81 covers the end of the cylinder seat 70 or the end of the cylinder seat 71. The cylinder head 82 is disposed on the valve plate 81. Both the cylinder seat 70 and the cylinder seat 71 facing the outer axial fan 9 have air inlets 10. The valve plate 81 has a ventilation hole 810 communicating with the cylinder seat 70 or the cylinder seat 71. The cylinder head 82 has a ventilation hole 820 communicating with the ventilation hole 810. When the outer axial fan 9 rotates, cooling air is blown onto the cylinder 80 through the air inlet 10 and blown outwards sequentially from the ventilation hole 810 and the ventilation hole 820. After the outer axial fan blade 9 rotates, it blows air towards the cylinder seat. The cooling air enters the cylinder seat 1 70 and cylinder seat 2 71 through the air inlet 10, so that the cooling air blows directly onto the outer circumferential surface of the cylinder 80, directly cooling the cylinder 80. Then, the cooling air in the cylinder seat flows through the ventilation hole 1 810 and the ventilation hole 2 820 in sequence and blows outward. That is, the cooling air cools the valve plate 81 and the cylinder head 82, which has a very good cooling effect on the cylinder 80, valve plate 81 and cylinder head 82.

[0043] like Figure 7 and Figure 9 As shown, an exhaust pipe 11 is provided in the area between cylinder seat 1 70 and cylinder seat 2 71. The exhaust pipe 11 is a metal pipe. This structure utilizes the area between cylinder seat 1 70 and cylinder seat 2 71 to arrange the exhaust pipe 11. This structure uses a metal exhaust pipe. The compressed gas has a certain temperature, and the metal exhaust pipe can absorb the heat of the compressed gas. The metal exhaust pipe can be regularly arranged in the area between cylinder seat 1 70 and cylinder seat 2 71. The cooling air blown by the outer axial fan blade 9 can be directly blown on the metal exhaust pipe to cool it down, thereby reducing the temperature of the gas entering the gas tank.

[0044] like Figure 8 , Figure 13 and Figure 14As shown, the air compressor also includes a shroud 13 surrounding the crankcase 7. The shroud 13 has an air inlet end 130 and an air outlet end 131. The air outlet end 131 faces the motor 2 and extends to the periphery of the cylinder assembly 8. The shroud 13 covers at least part of the cylinder assembly 8. The shroud 13 covers the outer axial flow fan blade 9 and the inner axial flow fan blade 12. The outer wall of the shroud 13 has several air inlet holes 132 corresponding to the position of the inner axial flow fan blade 12. The shroud 13 has filter plates 20 corresponding to the positions of the air inlet holes 132. The outer wall of the shroud 13 has several air inlet holes 133 corresponding to the positions of the outer axial flow fan blade 9. All the air inlet holes 133 form an annular air inlet area. After the inner axial flow fan blade 12 rotates, the outside air is filtered by the filter 14 and enters the fan shroud 13 through the air inlet 132, which plays a role in heat dissipation for the components in the crankcase 7. After the outer axial flow fan blade 9 rotates, the outside air enters the fan shroud 13 through the air inlet 133 and is then blown toward the cylinder assembly 8. In addition, the air outlet 131 of the fan shroud 13 extends to the periphery of the cylinder assembly 8. The fan shroud 13 also has a certain air guiding effect, guiding the cooling air blown out by the outer axial flow fan blade 9 to the cylinder assembly 8, so that the cooling air is concentrated on the cylinder assembly 8. Some of the cooling air is blown out from the outside of the cylinder head 82, further improving the cooling effect on the cylinder assembly 8.

[0045] like Figure 10 , Figure 11 and Figure 12 As shown, a partition plate 72 is provided on the side of the crankcase 7 near the motor 2, cylinder seat 1 70 is located away from the motor 2, and cylinder seat 2 71 is located near the motor 2. A ventilation hole 5 73 is provided in the crankcase 7 between cylinder seat 1 70 and the motor 2, and a ventilation hole 6 74 is provided in the cylinder seat 2 71 to connect to the inside of the crankcase 7. After the inner axial flow fan 12 rotates, it blows cooling air into the crankcase 7. The cooling air inside the crankcase 7 flows upward under the obstruction of the partition 72. Some of the cooling air flows outward from the ventilation hole 5 73, and some of the cooling air is blown into the cylinder block 2 71 from the ventilation hole 6 74 to cool down the cylinder assembly 8 inside the cylinder block 2 71. In addition, due to the large outer diameter of the outer axial flow fan 9, the cooling air blown out after the outer axial flow fan 9 rotates has a high wind speed. The cooling air blown out after the outer axial flow fan 9 rotates flows through the periphery of the crankcase 7, making the wind speed around the ventilation hole 5 73 faster, thus forming a siphon effect. This causes the cooling air inside the crankcase 7 to be accelerated out of the crankcase 7 through the ventilation hole 5 73, improving the cooling effect on the crankcase 7 and its internal components, and thus indirectly improving the cooling effect on the motor 2.

[0046] In this embodiment, a fixing foot is provided on the outer side wall of the crankcase 7 between cylinder seat 1 70 and cylinder seat 2 71. The fixing foot is cross-shaped and located at the axial extension position of connecting rod assembly 1 3 and connecting rod assembly 2 4. This structure makes full use of the space between cylinder seat 1 70 and cylinder seat 2 71 to arrange the fixing foot, and the crankcase 7 is fixedly connected to the gas tank through the fixing foot.

[0047] Example 2

[0048] like Figure 1 and Figure 7As shown, this embodiment is a dual-head eight-cylinder air compressor. Based on the single-head four-cylinder air compressor of Embodiment 1, this air compressor also includes two connecting rod assemblies three 18 and two connecting rod assemblies four 19. The two connecting rod assemblies three 18 and two connecting rod assemblies four 19 are arranged in a cross pattern with the main shaft 1 as the center. The two connecting rod assemblies three 18 are arranged in a centrally symmetrical pattern with the main shaft 1 as the center, and the two connecting rod assemblies four 19 are arranged in a centrally symmetrical pattern with the main shaft 1 as the center. A crankcase 7 is also provided at the rear end of the main shaft 1. The rear end of the main shaft 1 extends into the crankcase 7. The structure of the crankcase 7 in this embodiment is the same as that in Embodiment 1. That is, the crankcase 7 is provided with two cylinder seats one 70, two cylinder seats two 71 and cylinder assemblies 8. The two connecting rod assemblies three 18 are respectively assembled with the corresponding cylinder assemblies 8, and the two connecting rod assemblies four 19 are respectively assembled with the corresponding cylinder assemblies 8. The connecting rod assemblies three 18 and four 19 in this embodiment have the same structure as the connecting rod assemblies in Embodiment 1. Crank 3 16 and crank 4 17 are fitted onto the rear end of main shaft 1. Crank 3 16 includes two eccentric wheels 3 160, which are symmetrically arranged at 180° with respect to main shaft 1. Crank 4 17 includes two eccentric wheels 4 170, which are symmetrically arranged at 180° with respect to main shaft 1. Crank 3 16 is deflected by an angle ∠β relative to crank 1 5 about the rotation direction of main shaft 1, and crank 4 17 is deflected by an angle ∠θ relative to crank 1 5 about the rotation direction of main shaft 1. Two connecting rod assemblies 3 18 are respectively fitted onto the two eccentric wheels 3 160, and two connecting rod assemblies 4 19 are respectively fitted onto the two eccentric wheels 4 170. When main shaft 1 rotates, the two connecting rod assemblies 1 3, 2 connecting rod assemblies 4, 3 connecting rod assemblies 3 18, and 4 connecting rod assemblies 4 19 extend outward to their limit positions at four different rotation angles. When the air compressor is working, for example, in the initial state, the first connecting rod assembly 3 extends outward to its limit position. After rotating a certain angle, the two second connecting rod assemblies 4 extend outward to their limit positions. After rotating a certain angle again, the two third connecting rod assemblies 18 extend outward to their limit positions. After rotating a certain angle again, the two fourth connecting rod assemblies 19 extend outward to their limit positions. After rotating a certain angle again, the first connecting rod assembly 3 extends outward to its limit position again. At this time, the work sequence is the second connecting rod assembly 4, the third connecting rod assembly 18, the fourth connecting rod assembly 19, and the first connecting rod assembly 3. However, according to the setting of ∠α, ∠β, and ∠θ, any work sequence of the first connecting rod assembly 3, the second connecting rod assembly 4, the third connecting rod assembly 18, and the fourth connecting rod assembly 19 can be realized, and it is not limited to the work sequence exemplified in this embodiment.

[0049] Figure 5 The thick dashed line in the diagram represents the axis of crankshaft 5, and the thin dashed line represents the axis of crankshaft 316. Figure 6 The bold dashed line in the diagram represents the axis of crankshaft 5, and the thin dashed line represents the axis of crankshaft 4 (17). Figure 6 The two axes in the figure coincide, as in this embodiment, such as Figures 2-6As shown, cranks 1 (5), 2 (6), 3 (16), and 4 (17) are arranged sequentially from front to back on the main shaft 1, with ∠α = 90°, ∠β = 270°, and ∠θ = 0°. Initially, the two connecting rod assemblies 1 (3) extend outwards to their limit positions. After the main shaft rotates 90°, the two connecting rod assemblies 3 (18) extend outwards to their limit positions. When the main shaft rotates 180°, the two connecting rod assemblies 2 (4) extend outwards to their limit positions. When the main shaft rotates 270°, the two connecting rod assemblies 4 (19) extend outwards to their limit positions. When the main shaft rotates 360°, the two connecting rod assemblies 1 (3) extend outwards back to their limit positions, and this cycle repeats continuously. The four cranks in this structure operate at 90-degree intervals, meaning that each crank performs work in turn, alternating 90-degree angles with the main shaft. This distributes the load across the eight-cylinder multi-crank air compressor motor, bringing the upper limit of the motor load curve as close and smooth as possible to the lower limit of the no-load curve, thus optimizing energy consumption and reducing motor vibration and noise. Since the working sequence is crank 1 (crank 5), crank 3 (crank 16), crank 2 (crank 6), and crank 4 (crank 17), viewed laterally, the machine's work alternates between left and right. Mechanically, the distance from crank 1 (crank 5) to crank 3 (crank 16) is equal to the distance from crank 2 (crank 6) to crank 4 (crank 18). Under these conditions, the impact forces borne by the two housings and the shear forces on the main bearing are infinitely close during each work transition. This brings the overall vibration limits and the impact forces borne by each component of the machine infinitely closer, optimizing the machine's load-bearing capacity and extending the lifespan of the mechanical structure.

[0050] The technical solutions claimed by this utility model are not limited to the two air compressor structures of the single-head four-cylinder air compressor and the double-head eight-cylinder air compressor exemplified. Improved single-head six-cylinder air compressors and single-head eight-cylinder air compressors based on the single-head four-cylinder air compressor also fall within the protection scope of this utility model. Similarly, improved double-head twelve-cylinder air compressors and double-head sixteen-cylinder air compressors based on the double-head eight-cylinder air compressor also fall within the protection scope of this utility model.

[0051] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A compressor comprising a main shaft (1), two connecting rod assemblies I (3) and two connecting rod assemblies II (4), the two connecting rod assemblies I (3) and the two connecting rod assemblies II (4) being distributed in a cross around the main shaft (1), characterized in that, Two connecting rod assemblies one (3) are vertically opposite on both sides of the axis of the main shaft (1), two connecting rod assemblies two (4) are vertically opposite on both sides of the axis of the main shaft (1), the front end of the main shaft (1) is sleeved with a crank one (5) and a crank two (6), the crank one (5) comprises two eccentric wheels one (50), the two eccentric wheels one (50) are arranged in opposite directions with the main shaft (1) as the center, the crank two (6) comprises two eccentric wheels two (60), the two eccentric wheels two (60) are arranged in opposite directions with the main shaft (1) as the center, the crank two (6) is deflected by an angle ∠α along the rotation direction of the main shaft (1) relative to the crank one (5), the two connecting rod assemblies one (3) are respectively sleeved on the corresponding eccentric wheels one (50), and the two connecting rod assemblies two (4) are respectively sleeved on the corresponding eccentric wheels two (60), when the main shaft (1) rotates, the two connecting rod assemblies one (3) and the two connecting rod assemblies two (4) will respectively extend to the limit position or respectively retract to the limit position at different rotation angles.

2. The air compressor of claim 1, wherein, 0°≤∠α≤180°。 3. The air compressor according to claim 1 or 2, wherein The ∠α is 90°, when the two connecting rod assemblies one (3) extend to the limit position, the two connecting rod assemblies two (4) retract to the limit position, when the main shaft rotates by 180°, the two connecting rod assemblies two (4) extend to the limit position and the two connecting rod assemblies one (3) retract to the limit position.

4. The air compressor of claim 1, wherein, The air compressor further comprises a crankcase (7), the front end of the main shaft (1) penetrates into the crankcase (7), the two connecting rod assemblies one (3) and the two connecting rod assemblies two (4) are located in the crankcase (7), the crankcase (7) has two cylinder seats one (70) and two cylinder seats two (71), each cylinder seat one (70) and each cylinder seat two (71) is provided with a cylinder assembly (8), the two connecting rod assemblies one (3) are respectively assembled with the cylinder assemblies (8) on the two cylinder seats one (70), and the two connecting rod assemblies two (4) are respectively assembled with the cylinder assemblies (8) on the two cylinder seats two (71).

5. The air compressor of claim 4, wherein, The main shaft (1) is sleeved with an outer axial fan blade (9), the outer axial fan blade (9) is located outside the end face of the crankcase (7), the axial projection of the outer axial fan blade (9) can at least partially coincide with the cylinder seat one (70) or the cylinder seat two (71), and cooling wind can blow on the cylinder assembly (8) after the outer axial fan blade (9) rotates.

6. The air compressor of claim 5, wherein, The cylinder assembly (8) comprises a cylinder (80), a valve plate (81) and a cylinder cover (82), the cylinder (80) is arranged in the cylinder seat one (70) or the cylinder seat two (71), the valve plate (81) is arranged at the end of the cylinder seat one (70) or the end of the cylinder seat two (71), the cylinder cover (82) is arranged on the valve plate (81), the cylinder seat one (70) and the cylinder seat two (71) are both provided with an air inlet (10) on the side facing the outer axial fan blade (9), the valve plate (81) is provided with a ventilation hole one (810) communicating with the cylinder seat one (70) or the cylinder seat two (71), the cylinder cover (82) is provided with a ventilation hole two (820) communicating with the ventilation hole one (810), when the outer axial fan blade (9) rotates, the cooling air blows on the cylinder (80) through the air inlet (10) and is blown out from the ventilation hole one (810) and the ventilation hole two (820) in turn.

7. The air compressor of claim 5, wherein, The inner axial fan blade (12) is arranged on the main shaft (1) and can blow air to the inside of the forward crankcase (7), and the outer axial fan blade (9) is arranged on the radially outer side of the inner axial fan blade (12).

8. The air compressor of claim 7, wherein, The air compressor further comprises a motor (2) and a fan cover (13) covering the periphery of the crankcase (7), the fan cover (13) has an air inlet end (130) and an air outlet end (131), the air outlet end (131) faces the motor (2), the air outlet end (131) extends to the periphery of the cylinder assembly (8), the fan cover (13) covers at least part of the cylinder assembly (8), the fan cover (13) covers the outer axial fan blade (9) and the inner axial fan blade (12), a plurality of air inlet holes three (132) are arranged on the outer side wall of the fan cover (13) corresponding to the position of the inner axial fan blade (12), the fan cover (13) is provided with a filter piece (20) corresponding to the position of the air inlet hole three (132), and a plurality of air inlet holes four (133) are arranged on the outer side wall of the fan cover (13) corresponding to the position of the outer axial fan blade (9).

9. The air compressor of claim 7, wherein, The crankcase (7) is provided with a partition plate (72) on the side close to the motor (2), the cylinder seat one (70) is arranged away from the motor (2), the cylinder seat two (71) is arranged close to the motor (2), the crankcase (7) is provided with a ventilation hole five (73) between the cylinder seat one (70) and the motor (2), and the cylinder seat two (71) is provided with a ventilation hole six (74) communicating with the inside of the crankcase (7).

10. The air compressor of claim 1, wherein, The rear end of the main shaft (1) is sleeved with a crank three (16) and a crank four (17), the crank three (16) includes two eccentric wheels three (160) arranged in opposite directions with the main shaft (1) as the center, the crank four (17) includes two eccentric wheels four (170) arranged in opposite directions with the main shaft (1) as the center, the crank three (16) is deflected by an angle ∠β along the rotation direction of the main shaft (1) relative to the crank one (5), and the crank four (17) is deflected by an angle ∠θ along the rotation direction of the main shaft (1) relative to the crank one (5); the air compressor further includes two connecting rod assemblies three (18) and two connecting rod assemblies four (19), the two connecting rod assemblies three (18) and the two connecting rod assemblies four (19) are cross-distributed around the main shaft (1), the two connecting rod assemblies three (18) are oppositely arranged on both sides of the main shaft (1) axis perpendicularly, the two connecting rod assemblies four (19) are oppositely arranged on both sides of the main shaft (1) axis perpendicularly, the two connecting rod assemblies three (18) are respectively sleeved on the two eccentric wheels three (160), and the two connecting rod assemblies four (19) are respectively sleeved on the two eccentric wheels four (170); when the main shaft (1) rotates, the two connecting rod assemblies one (3), the two connecting rod assemblies two (4), the two connecting rod assemblies three (18) and the two connecting rod assemblies four (19) respectively extend to the limit position or are respectively retracted to the limit position at four different rotation angles.

11. The air compressor of claim 10, wherein, The crank one (5), the crank two (6), the crank three (16) and the crank four (17) are sequentially arranged on the main shaft (1) from front to back, the ∠α is 90°, the ∠β is 270°, and the ∠θ is 0°; when the two connecting rod assemblies one (3) extend to the limit position, the two connecting rod assemblies three (18) extend to the limit position when the main shaft rotates by 90°, the two connecting rod assemblies two (4) extend to the limit position when the main shaft (1) rotates by 180°, the two connecting rod assemblies four (19) extend to the limit position when the main shaft rotates by 270°, and the two connecting rod assemblies one (3) extend to the limit position again when the main shaft rotates by 360°.

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