Heat dissipation structure of oilless air compressor

Abstract

The utility model provides a heat dissipation structure of an oilless air compressor, and belongs to the technical field of air compressors. The single-head multi-cylinder air compressor solves the problem that a cylinder head of an existing single-head multi-cylinder air compressor is poor in heat dissipation effect. The heat dissipation structure of the oilless air compressor comprises a crankcase and a main shaft, one end of the main shaft extends into the crankcase, two or more cylinder bases are arranged on the outer side wall of the crankcase, each cylinder base is provided with an air cylinder assembly, the main shaft is sleeved with an inner axial-flow fan blade, and the inner axial-flow fan blade can blow air towards the interior of the crankcase. Outer axial-flow fan blades are arranged on the periphery of the inner axial-flow fan blades, the outer axial-flow fan blades are located on the outer side of the end face of the crankcase, at least part of the axial projection, in the main shaft, of the outer axial-flow fan blades coincides with the cylinder base or the air cylinder assembly, and the outer axial-flow fan blades can blow air towards the direction of the cylinder base. According to the structure, heat dissipation and cooling of the air cylinder assembly are remarkably improved, the service life of the piston is prolonged, and all cylinder heads of the one-head multi-cylinder air compressor have the very good heat dissipation effect.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air compressor technical field, especially a heat dissipation structure of oil -free air compressor. BACKGROUND

[0002] Single -end four cylinder air compressor is a kind of air compressor of special structure, its core feature is the design of four cylinder driven by single crankshaft, and high -efficient compression is realized by the collaborative work of multiple cylinders, this structure is widely used in industrial field, especially suitable for the scene needing high exhaust volume, stable air pressure and long -term continuous operation.

[0003] At present, Chinese patent network discloses a kind of piston air compressor

application number: 201810246095.3

[0004] The utility model aims at the above-mentioned problems existing in prior art, and provides a heat dissipation structure of oil-free air compressor, and the technical problem to be solved by the utility model is how to solve the poor cylinder head heat dissipation effect of existing single-head multi-cylinder air compressor.

[0005] The purpose of the utility model can be realized by the following technical schemes:

[0006] A kind of heat dissipation structure of oil-free air compressor, including crankcase and the main shaft that one end is stretched to crankcase, two or more than two cylinder seats are provided on the outer side wall of the crankcase, each cylinder seat is provided with cylinder assembly, inner shaft flow fan blade is sleeved on the main shaft, the inner shaft flow fan blade can blow wind towards the inside of crankcase, it is characterized in that, outer shaft flow fan blade is arranged on the periphery of the inner shaft flow fan blade, outer shaft flow fan blade is located on the outside of crankcase end face, the axial projection of outer shaft flow fan blade at least part coincides with cylinder seat or cylinder assembly, outer shaft flow fan blade can blow wind towards cylinder seat direction.

[0007] When the main shaft rotates, both the inner and outer axial flow fan blades rotate simultaneously. The inner axial flow fan blows cooling air into the crankcase, cooling the bearings, cranks, connecting rods, and other components inside the crankcase. The outer axial flow fan's axial projection along the main shaft at least partially coincides with the cylinder block or cylinder assembly, meaning its maximum outer diameter is larger than the end of the main shaft. The rotation of the main shaft drives the outer axial flow fan to rotate, blowing air towards the cylinder block. The outer axial flow fan directly cools all the cylinder assemblies on the cylinder blocks in the crankcase, significantly improving heat dissipation and piston lifespan. This results in excellent heat dissipation for all cylinder heads in a multi-cylinder air compressor. In addition, the inner end of the crankcase is generally connected to the motor. Some air compressors have a motor housing, and the cooling air blown by the outer axial flow fan onto the cylinder assembly also directly cools the motor housing.

[0008] In the aforementioned heat dissipation structure of an oil-free air compressor, the cylinder assembly includes a cylinder, a valve plate, and a cylinder head. The cylinder is housed within a cylinder seat, the valve plate is located at the end of the cylinder seat, and the cylinder head is mounted on the valve plate. An air inlet is provided on the side of the cylinder seat facing the outer axial fan. When the outer axial fan rotates, it blows air towards the cylinder seat. The cooling air enters the cylinder seat through the air inlet, directly cooling the outer circumference of the cylinder. This provides excellent heat dissipation for the cylinder and indirectly cools the piston inside the cylinder, reducing piston damage and extending its service life.

[0009] In the aforementioned heat dissipation structure of an oil-free air compressor, the valve plate has a ventilation hole 1 connecting to the cylinder seat, and the cylinder head has a ventilation hole 2 connecting to the ventilation hole 1. When the outer axial fan blades rotate, cooling air is blown onto the cylinder through the air inlet and then sequentially blown out through ventilation hole 1 and ventilation hole 2. The cooling air blown into the cylinder seat flows sequentially through ventilation hole 1 and ventilation hole 2 before being blown out, thus cooling the valve plate and cylinder head, resulting in a very good cooling effect.

[0010] In the aforementioned heat dissipation structure of an oil-free air compressor, the inner axial flow fan blade has a radial partition ring around its periphery, and the outer axial flow fan blade is disposed on the outer circumferential surface of the radial partition ring. In this structure, the inner and outer axial flow fan blades can be manufactured as a single component. The outer axial flow fan blade can be installed by fitting the inner axial flow fan blade onto the main shaft. Integrating the two fan blades into a single part results in a more compact structure and facilitates assembly.

[0011] In the above-mentioned heat dissipation structure of an oil-free air compressor, the heat dissipation structure 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 is arranged inward and extends to the periphery of the cylinder assembly. The fan shroud covers at least part of the cylinder assembly. The fan shroud covers the outer axial flow fan blade and the inner axial flow fan blade. The outer side wall of the fan shroud has a plurality of air inlet holes three corresponding to the position of the inner axial flow fan blade. The outer side wall of the fan shroud has a plurality of air inlet holes four corresponding to the position of the outer axial flow fan blade. After the inner axial fan blades rotate, outside air enters the crankcase through air inlet three, which helps to dissipate heat from the components inside the crankcase. After the outer axial fan blades rotate, outside air enters the fan shroud through air inlet four and is then blown toward 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 heat dissipation fins of the cylinder head, further improving the cooling effect on the cylinder assembly.

[0012] In the aforementioned heat dissipation structure of an oil-free air compressor, the cylinder head has several heat dissipation ribs, and a ventilation channel is formed between two adjacent heat dissipation ribs. The air inlet of the ventilation channel faces the fan shroud, and the air outlet faces the motor side. Cooling air blown by the outer axial fan blades is guided by the fan shroud, entering the ventilation channel from the air inlet and then flowing outwards from the air outlet. This cooling air effectively dissipates heat from the heat dissipation ribs, improving the heat dissipation effect on the cylinder head.

[0013] In the heat dissipation structure of the aforementioned oil-free air compressor, the end of the heat dissipation fin facing the fan shroud has an arc-shaped air guide, which is located inside the fan shroud. The arc shape of the air guide reduces the height of the cylinder head and facilitates the entry of cooling air into the ventilation channel.

[0014] In the aforementioned heat dissipation structure of an oil-free air compressor, a baffle is provided on the side of the crankcase away from the inner axial fan blades, and a ventilation hole five is provided on the crankcase near the cylinder block. When the inner axial fan blades rotate, they blow cooling air into the crankcase. The cooling air inside the crankcase flows upwards due to the obstruction of the baffle, and some of the cooling air flows outwards through the ventilation hole five. Because the outer diameter of the outer axial fan blades is large, the cooling air blown out by the outer axial fan blades has a high wind speed. This cooling air flows around the periphery of the crankcase, resulting in a faster wind speed around the ventilation hole five, thus creating a siphon effect. This causes the cooling air inside the crankcase to be accelerated and drawn out of the crankcase through the ventilation hole five, improving the cooling effect on the crankcase and its internal components, and indirectly improving the cooling effect on the motor.

[0015] In the aforementioned heat dissipation structure of an oil-free air compressor, a ventilation hole six is ​​provided inside the cylinder block, connecting to the inside of the crankcase. Part of the cooling air is blown into the cylinder block through the ventilation hole six, cooling the cylinder assembly within the cylinder block and further improving the heat dissipation effect on the cylinder assembly.

[0016] In the aforementioned heat dissipation structure of an oil-free air compressor, all cylinder seats are arranged radially along the outer wall of the crankcase, and an exhaust pipe is provided between two adjacent cylinder seats. This structure has multiple cylinder seats on the crankcase, all evenly distributed on the outer wall. The rotating outer axial fan dissipates heat from the cylinder assemblies on all cylinder seats. Simultaneously, the space between two cylinder seats is fully utilized to arrange the exhaust pipe, with one end connected to the cylinder head and the other end connected to the air tank, further cooling the exhaust pipe and reducing the temperature of the high-pressure gas entering the air tank.

[0017] In the aforementioned heat dissipation structure of an oil-free air compressor, the boundary between the outer axial flow fan and the inner axial flow fan is located near the edge of the crankcase port. The outer diameter of the outer axial flow fan is 1.2 to 1.8 times the size of the crankcase port. This structure ensures that when the outer axial flow fan is working, the air drawn in by the outer axial flow fan will not flow into the crankcase. The outer diameter of the outer axial flow fan, being 1.2 to 1.8 times the size of the crankcase port, guarantees that the cooling air has a large flow rate and high velocity after the outer axial flow fan rotates, further improving the cooling effect on various components of the cylinder head.

[0018] Compared with the prior art, the heat dissipation structure of the oil-free air compressor of this utility model has the following advantages: In this structure, the axial projection of the outer axial flow fan blade along the main shaft is at least partially coincident with the cylinder seat or cylinder assembly, that is, the maximum outer diameter of the outer axial flow fan blade is larger than the port of the main shaft box. After the main shaft rotates, it drives the outer axial flow fan blade to rotate. The outer axial flow fan blade blows air towards the cylinder seat, which directly dissipates heat and cools the cylinder assembly on the cylinder seat. This can significantly improve the heat dissipation and cooling of the cylinder assembly and improve the service life of the piston. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a side view of the present invention.

[0021] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0022] Figure 4 This is a schematic diagram of the partial explosion structure of this utility model.

[0023] Figure 5 This is one of the three-dimensional structural schematic diagrams of the crankcase of this utility model.

[0024] Figure 6 This is the second three-dimensional structural schematic diagram of the crankcase of this utility model.

[0025] Figure 7 This is one of the partial three-dimensional structural schematic diagrams of the crankcase of this utility model.

[0026] Figure 8 This is a three-dimensional structural diagram of the wind shield of this utility model.

[0027] In the diagram, 1. Crankcase; 100. Baffle plate; 101. Ventilation hole five; 102. Ventilation hole six; 2. Main shaft; 3. Cylinder seat; 30. Air inlet; 4. Cylinder assembly; 40. Cylinder; 41. Valve plate; 410. Ventilation hole one; 42. Cylinder head; 420. Ventilation hole two; 421. Cooling fins; 422. Air guide; 5. Outer axial flow fan blades; 6. Inner axial flow fan blades; 60. Radial separator ring; 7. Fan cover; 70. Air inlet end; 71. Air outlet end; 72. Air inlet three; 73. Air inlet four; 8. Ventilation channel; 80. Air inlet channel opening; 81. Air outlet channel opening; 9. Air outlet pipe. Detailed Implementation

[0028] 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.

[0029] like Figures 1-8As shown, the heat dissipation structure of this oil-free air compressor includes a crankcase 1 and a main shaft 2 extending into the crankcase 1 at one end. A cylinder seat 3 is provided on the outer wall of the crankcase 1. The crankcase 1 has two or more cylinder seats 3, and all cylinder seats 3 are arranged radially along the outer wall of the crankcase 1. A cylinder assembly 4 is provided on the cylinder seat 3. An inner axial flow fan 6 is sleeved on the main shaft 2. The inner axial flow fan 6 can blow air towards the interior of the crankcase 1. The outer periphery of the inner axial flow fan 6 has a radial partition ring 60. An outer axial flow fan 5 is provided on the outer circumferential surface of the radial partition ring 60. The outer axial flow fan 5 is located on the radial periphery of the inner axial flow fan 6 and is located on the outer side of the end face of the crankcase 1. The axial projection of the outer axial flow fan 5 along the main shaft 2 at least partially coincides with the cylinder seat 3 or the cylinder assembly 4. The outer axial flow fan 5 can blow air towards the cylinder seat 3. In this structure, the axial projection of the outer axial flow fan 5 along the main shaft 1 at least partially coincides with the cylinder seat 3 or the cylinder assembly 4. That is, the maximum outer diameter of the outer axial flow fan 5 is larger than the port of the main shaft box 1. After the main shaft 2 rotates, it drives the outer axial flow fan 5 to rotate. The outer axial flow fan 5 blows air towards the cylinder seat 3, directly dissipating heat and cooling the cylinder assembly 4 on the cylinder seat 3. This can significantly improve the heat dissipation and cooling of the cylinder assembly 4 and increase the service life of the piston. An exhaust pipe 9 is provided between two adjacent cylinder seats 3. The space between the two cylinder seats 3 is fully utilized to arrange the exhaust pipe 9. One end of the exhaust pipe 9 is connected to the cylinder head, and the other end is connected to the air storage tank. The exhaust pipe 9 dissipates heat and cools down, reducing the temperature of the high-pressure gas entering the air storage tank.

[0030] The boundary between the outer axial flow fan blade 5 and the inner axial flow fan blade 6 is located near the edge of the crankcase 1 port. The outer diameter of the outer axial flow fan blade 5 is 1.2 to 1.8 times the size of the crankcase 1 port. This structure ensures that when the outer axial flow fan blade 5 is working, the air drawn in by the outer axial flow fan blade 5 will not flow into the crankcase 1. The outer diameter of the outer axial flow fan blade 5 being 1.2 to 1.8 times the size of the crankcase 1 port ensures that the cooling air has a large flow rate and high wind speed after the outer axial flow fan blade 5 rotates, further improving the cooling effect on various components of the cylinder head.

[0031] like Figure 1 , Figure 2 and Figure 3As shown, the cylinder assembly 4 includes a cylinder 40, a valve plate 41, and a cylinder head 42. The cylinder 40 is disposed within the cylinder seat 3, the valve plate 41 covers the end of the cylinder seat 3, and the cylinder head 42 is disposed on the valve plate 41. The cylinder seat 3 has an air inlet 30 on the side facing the outer axial fan 5. After the outer axial fan 5 rotates, it blows air towards the cylinder seat 3. The cooling air enters the cylinder seat 3 through the air inlet 30, allowing the cooling air to directly blow onto the outer circumferential surface of the cylinder 40, directly cooling the cylinder 40 and providing excellent heat dissipation. This indirectly dissipates heat from the piston inside the cylinder 40, reducing piston damage and extending piston life. The valve plate 41 has a ventilation hole 410 that connects to the cylinder seat 3, and the cylinder cover 42 has a ventilation hole 420 that connects to the ventilation hole 410. When the outer axial fan blade 5 rotates, the cooling air is blown onto the cylinder 40 through the air inlet 30 and blown outwards from the ventilation hole 410 and the ventilation hole 420 in sequence, thereby effectively cooling the valve plate 41 and the cylinder cover 42.

[0032] like Figure 1 , Figure 5 and Figure 6 As shown, a partition plate 100 is provided on the side of the crankcase 1 away from the inner axial flow fan blade 6. A ventilation hole 101 is provided on the crankcase 1 near the cylinder seat 3. A ventilation hole 102 is provided in the cylinder seat 3 to connect to the inside of the crankcase 1. After the inner axial flow fan 6 rotates, it blows cooling air into the crankcase 1. The cooling air inside the crankcase 1 flows upward under the obstruction of the partition 100. Some of the cooling air flows outward from the ventilation hole 5 101. Due to the large outer diameter of the outer axial flow fan 5, the cooling air blown out after the outer axial flow fan 5 rotates has a high wind speed. The cooling air blown out after the outer axial flow fan 5 rotates flows through the periphery of the crankcase 1, making the wind speed around the ventilation hole 5 101 faster, thus forming a siphon effect. This causes the cooling air inside the crankcase 1 to be accelerated and drawn out of the crankcase 1 through the ventilation hole 5 101, improving the cooling effect on the crankcase 1 and its internal components, and thus indirectly improving the cooling effect on the motor. Some of the cooling air is blown into the cylinder block 3 from the ventilation hole 6 102, cooling the cylinder assembly 4 inside the cylinder block 3, further improving the heat dissipation and cooling effect on the cylinder assembly 4.

[0033] like Figure 3As shown, the heat dissipation structure also includes a fan shroud 7 covering the crankcase 1. The fan shroud 7 has an air inlet end 70 and an air outlet end 71. The air outlet end 71 is arranged inward and extends to the periphery of the cylinder assembly 4. The fan shroud 7 covers at least part of the cylinder assembly 4. The fan shroud 7 covers the outer axial flow fan blade 5 and the inner axial flow fan blade. The outer side wall of the fan shroud 7 has a plurality of air inlet holes 72 corresponding to the position of the inner axial flow fan blade 6. The outer side wall of the fan shroud 7 has a plurality of air inlet holes 73 corresponding to the position of the outer axial flow fan blade 5. After the inner axial fan blade 6 rotates, the outside air enters the crankcase 1 through the air inlet 3 72, which helps to dissipate heat from the components inside the crankcase 1. After the outer axial fan blade 5 rotates, the outside air enters the fan shroud 7 through the air inlet 4 73, and is then blown toward the cylinder assembly 4. In addition, the air outlet 71 of the fan shroud 7 extends to the periphery of the cylinder assembly 4. The fan shroud 7 also has a certain air guiding effect, guiding the cooling air blown out by the outer axial fan blade 5 to the cylinder assembly 4, so that the cooling air is concentrated on the cylinder assembly 4, and some of the cooling air is directly blown onto the heat dissipation fins of the cylinder head 42, further improving the cooling effect on the cylinder assembly 4.

[0034] like Figure 1 and Figure 3 As shown, the cylinder head 42 has several cooling ribs 421, and a ventilation channel 8 is formed between two adjacent cooling ribs 421. The air inlet 80 of the ventilation channel 8 faces the fan shroud 7, and the air outlet 81 faces inward. The end of the cooling rib 421 facing the fan shroud 7 has an arc-shaped air guide 422, which is located inside the fan shroud 7. The cooling air blown by the outer axial fan blades 5 is guided by the fan shroud 7, and enters the ventilation channel 8 from the air inlet 80, and then flows outward from the air outlet 81. The cooling air effectively dissipates heat from the cooling ribs 421, improving the cooling effect on the cylinder head 42.

[0035] 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 heat dissipation structure of an oil-free air compressor, comprising a crankcase (1) and a main shaft (2) extending into the crankcase (1), two or more cylinder blocks (3) are arranged on the outer side wall of the crankcase (1), a cylinder assembly (4) is arranged on each cylinder block (3), an inner axial flow fan blade (6) is sleeved on the main shaft (2), and the inner axial flow fan blade (6) can blow air towards the inside of the crankcase (1), characterized in that, The outer periphery of the inner axial flow fan blade (6) is provided with an outer axial flow fan blade (5), the outer axial flow fan blade (5) is located outside the end face of the crankcase (1), the axial projection of the outer axial flow fan blade (5) at least partially coincides with the cylinder block (3) or the cylinder assembly (4), and the outer axial flow fan blade (5) can blow air towards the cylinder block (3).

2. The heat dissipation structure of an oil-free air compressor according to claim 1, wherein, The cylinder assembly (4) comprises a cylinder (40), a valve plate (41) and a cylinder cover (42), the cylinder (40) is arranged in the cylinder block (3), the valve plate (41) is arranged at the end of the cylinder block (3), and the cylinder cover (42) is arranged on the valve plate (41). The side of the cylinder block (3) facing the outer axial flow fan blade (5) is provided with an air inlet (30).

3. The heat dissipation structure of an oil-free air compressor according to claim 2, wherein, The valve plate (41) is provided with a first ventilation hole (410) communicating with the inside of the cylinder block (3), and the cylinder cover (42) is provided with a second ventilation hole (420) communicating with the first ventilation hole (410). When the outer axial flow fan blade (5) rotates, the cooling air blows on the cylinder (40) through the air inlet (30) and is sequentially blown out from the first ventilation hole (410) and the second ventilation hole (420).

4. The heat dissipation structure of an oil-free air compressor according to claim 2, wherein, The outer periphery of the inner axial flow fan blade (6) is provided with a radial separation ring (60), and the outer axial flow fan blade (5) is arranged on the outer peripheral surface of the radial separation ring (60).

5. The heat dissipation structure of an oil-free air compressor according to claim 4, wherein, The heat dissipation structure further comprises a fan cover (7) covering the outer periphery of the crankcase (1), the fan cover (7) has an air inlet end (70) and an air outlet end (71), the air outlet end (71) is arranged inwardly, the air outlet end (71) extends to the outer periphery of the cylinder assembly (4), the fan cover (7) covers at least part of the cylinder assembly (4), the fan cover (7) covers the outer axial flow fan blade (5) and the inner axial flow fan blade, the outer side wall of the fan cover (7) is provided with a plurality of air inlet holes (72) corresponding to the position of the inner axial flow fan blade (6), and the outer side wall of the fan cover (7) is provided with a plurality of air inlet holes (73) corresponding to the position of the outer axial flow fan blade (5).

6. The heat dissipation structure of an oil-free air compressor according to claim 5, wherein, The cylinder cover (42) has a plurality of heat dissipation ribs (421), and adjacent two heat dissipation ribs (421) form a ventilation flow channel (8), the air inlet flow channel (80) of the ventilation flow channel (8) faces the fan cover (7), and the air outlet flow channel (81) faces the inner side.

7. The heat dissipation structure of an air compressor according to claim 6, wherein The end of the heat dissipation rib (421) facing the fan cover (7) has a circular arc-shaped air guide part (422), and the air guide part (422) is located in the fan cover (7).

8. The heat dissipation structure of an oil-free air compressor according to claim 4, wherein, The side of the crankcase (1) away from the inner axial flow fan blade (6) is provided with a partition plate (100), the crankcase (1) is provided with a ventilation hole (101) at a position close to the cylinder block (3), and the cylinder block (3) is provided with a ventilation hole (102) communicating with the inside of the crankcase (1).

9. The heat dissipation structure of an oil-free air compressor according to claim 1, wherein, All the cylinder blocks (3) are arranged radially along the outer side wall of the crankcase (1), and an air outlet pipe (9) is arranged between adjacent two cylinder blocks (3).

10. The heat dissipation structure of an oil-free air compressor according to claim 1, wherein, The boundary position of the outer axial flow fan blade (5) and the inner axial flow fan blade (6) is close to the edge of the port of the crankcase (1), and the outer diameter of the outer axial flow fan blade (5) is 1.2-1.8 times the size of the port of the crankcase (1).

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