Cylinder head heat dissipation structure of multi-cylinder air compressor

Abstract

The utility model provides a cylinder head heat dissipation structure of a multi-cylinder air compressor, and belongs to the technical field of air compressors. The problem that existing cooling air cannot uniformly radiate heat of a plurality of cylinder heads is solved. The cylinder head heat dissipation structure of the multi-cylinder air compressor comprises a crankcase, an axial flow fan blade and a motor driving the axial flow fan blade to rotate, at least two cylinder bases are arranged at the top end of the crankcase, each cylinder base is provided with a cylinder head, each cylinder head comprises an air cylinder, an air cavity is formed in the side, facing the motor, of the crankcase, and each cylinder base is provided with a ventilation opening communicated with the air cavity. The ventilation openings are formed in the circumferential direction of the lower end of the air cylinder, and the axial-flow fan blades are arranged between the end of the motor and the air cavity and can blow air into the air cavity. The ventilation openings are formed around the lower end of the air cylinder, so that cooling air surrounds the peripheral face of the air cylinder and flows in the axial direction of the air cylinder, heat of the air cylinder is taken away, and the heat dissipation effect on the air cylinder is remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air compressors, in particular to a cylinder head heat dissipation structure of a multi-cylinder air compressor. Background Art

[0002] An air compressor is a device used to compress gas and is widely used in various fields of industrial production, mainly used to provide a power source for pneumatic tools. The motor is the driving device of the air compressor. After the motor works for a long time, the motor is prone to overheating. To ensure the service life of the motor, generally, a wind blade is arranged on the motor shaft, and after the wind blade rotates, it dissipates heat and cools down the motor.

[0003] At present, the Chinese Patent Network discloses an internal suction type oil-free piston brake air pump [Application No.: 201710845744.7], which discloses that a permanent magnet motor drives the main shaft to rotate, and the wind wheel fixed on the main shaft rotates synchronously with the main shaft. The wind wheel is arranged in the volute air storage cavity formed after the cylinder shell and the support volute are fitted and installed. When the wind wheel rotates, the cooling air is sucked into the volute air storage cavity through the cooling air inlet on the support volute. After being pressurized in the volute air storage cavity, it enters the heat dissipation cavity through the air inlet of the cylinder block, and then is discharged after passing through the heat dissipation cavity close to the cylinder head. This structure enables the permanent magnet motor to dissipate heat well, and the pressurization effect of the volute air storage cavity makes the cylinder block and the cylinder head dissipate heat more thoroughly.

[0004] The above-mentioned air pump has the following defects: The air pump has a double-head four-cylinder structure. Since the wind wheel uses a centrifugal wind blade, the wind generated after the centrifugal wind blade rotates is thrown outwards by centrifugal force, so that one of the cylinder heads is subjected to a greater blowing force, and the other cylinder head is subjected to a smaller blowing force. The cooling air cannot evenly dissipate heat to each cylinder head, affecting the heat dissipation effect of each cylinder head. Content of the Utility Model

[0005] The purpose of the present utility model is to address the above problems existing in the prior art and propose a cylinder head heat dissipation structure of a multi-cylinder air compressor. The technical problem to be solved by the present utility model is: how to solve the problem that the cooling air cannot evenly dissipate heat to multiple cylinder heads.

[0006] The purpose of the present utility model can be achieved by the following technical solutions:

[0007] A cylinder head heat dissipation structure of a multi-cylinder air compressor includes a crankcase, an axial flow wind blade, and a motor for driving the axial flow wind blade to rotate. At least two cylinder seats are arranged at the top end of the crankcase, and each cylinder seat is provided with a cylinder head. The cylinder head includes a cylinder. It is characterized in that a wind cavity is provided on one side of the crankcase facing the motor, each cylinder seat has a ventilation port communicated with the wind cavity, the ventilation port is arranged around the circumference of the lower end of the cylinder, the axial flow wind blade is arranged between the end of the motor and the wind cavity, and the axial flow wind blade can blow air into the wind cavity.

[0008] In this structure, a wind cavity is provided between the axial-flow fan blade and the crankcase. The wind cavity has a certain space to ensure that the blown-in wind can flow within the wind cavity. When the air compressor operates, the motor drives the axial-flow fan blade to rotate. After the axial-flow fan blade rotates, it blows wind into the wind cavity. The structure of setting ventilation openings on the cylinder block enables each cylinder block to communicate with the wind cavity. The cooling wind flows into the wind cavity and then blows towards each cylinder head through each ventilation opening. The cooling wind generated by the axial-flow fan blade flows horizontally, thereby ensuring that the cooling wind in the wind cavity is relatively evenly distributed to each ventilation opening, ensuring uniform heat dissipation for each cylinder head, and thus improving the heat dissipation effect on each cylinder head. Since the ventilation openings in this structure are arranged around the lower end of the cylinder, the cooling wind flows around the outer peripheral surface of the cylinder and along the axial direction of the cylinder, taking away the heat of the cylinder and significantly improving the heat dissipation effect on the cylinder.

[0009] In the cylinder head heat dissipation structure of the above-mentioned multi-cylinder air compressor, there are several ventilation openings. All the ventilation openings are arranged at intervals in the circumferential direction around the lower end of the cylinder, and all the ventilation openings enclose at least more than one-third of the circumference of the lower end of the cylinder. This structure ensures that the cooling wind has a large contact area with the outer peripheral surface of the cylinder, ensuring a good heat dissipation effect on the cylinder.

[0010] In the cylinder head heat dissipation structure of the above-mentioned multi-cylinder air compressor, there are three ventilation openings, and the interval angle of the three ventilation openings is 90°. This structure makes the distribution positions of the ventilation openings relatively uniform, which is beneficial to the heat dissipation of the cylinder.

[0011] In the cylinder head heat dissipation structure of the above-mentioned multi-cylinder air compressor, the wind cavity extends to more than two-thirds of the center of the cylinder block. The wind cavity surrounds the cylinder block, which is beneficial to the intake of air by the cylinder block and improves the heat dissipation effect on the cylinder head.

[0012] In the cylinder head heat dissipation structure of the above-mentioned multi-cylinder air compressor, the wind cavity extends between two adjacent cylinder blocks. The size of the wind cavity is increased, which facilitates the wind in the wind cavity to enter the cylinder block through the ventilation openings.

[0013] In the cylinder head heat dissipation structure of the above-mentioned multi-cylinder air compressor, valve plate support parts are provided at the positions of the crankcase corresponding to the cylinder blocks. The cylinder head includes a valve plate and a cylinder head cover. The valve plate is arranged on the valve plate support part. Heat dissipation holes are provided on both the valve plate and the cylinder head cover. When the axial-flow fan blade rotates, the wind can flow through the ventilation openings and then pass through the heat dissipation holes on the valve plate and the heat dissipation holes on the cylinder head cover. Through the setting of this structure, after the cooling wind first flows around the outside of the cylinder and along the axial direction of the cylinder, the cooling wind then penetrates through each heat dissipation hole and flows to the outside. The cooling wind is in full contact with the valve plate and the cylinder head cover, improving the heat dissipation effect on the valve plate and the cylinder head cover.

[0014] In the above cylinder head heat dissipation structure of a multi-cylinder air compressor, a ventilation space is formed between the outer side wall of the valve plate support portion and the outer peripheral surface of the cylinder, and the heat dissipation holes on the valve plate are communicated with the ventilation space. The cooling air coming in from the ventilation port enters the ventilation space and then blows towards the heat dissipation holes, which is beneficial to dissipating the heat of the valve plate and the cylinder head.

[0015] In the above cylinder head heat dissipation structure of a multi-cylinder air compressor, a closed air intake cavity is provided in the crankcase. An air inlet pipeline is arranged in the air cavity. An air inlet is arranged on the inner wall of the crankcase, and a check valve is arranged in the air inlet. One end of the air inlet pipeline is connected to the check valve. The air inlet pipeline is installed in a concealed manner. On the one hand, it makes the overall appearance of the air compressor more beautiful, and on the other hand, it also serves the purpose of protecting the air inlet pipeline, and the air inlet pipeline is not easily damaged.

[0016] In the above cylinder head heat dissipation structure of a multi-cylinder air compressor, the axial flow fan blade is arranged close to the end of the motor. This cylinder head heat dissipation structure further includes an air inlet located outside the motor. When the axial flow fan blade rotates, the outside air flows through the end of the motor during the process of being blown into the air cavity through the air inlet. After the axial flow fan blade rotates, a negative pressure is formed on the side of the axial flow fan blade facing the end of the motor, and the outside air is sucked into the air cavity through the air inlet. Since the axial flow fan blade is arranged close to the end of the motor, when the winding coil at the end of the motor is not covered by a metal cover during the process of the cooling air flowing into the air cavity, the cooling air flows circumferentially around the winding coil from the periphery, that is, the cooling air surrounds the winding coil, not only taking away the heat on the surface and periphery of the winding coil, but also the cooling air can penetrate into the internal gaps of the winding coil, so that the heat accumulated in the internal gaps of the winding coil is also sucked out by the negative pressure, significantly improving the cooling and temperature reduction effect on the winding coil, and further improving the cooling effect on the motor. Compared with the air blown directly by the fan blade on the winding, this cooling method can more significantly reduce the temperature of the motor. It can be obtained from the experimental test data that the motor temperature drops by 4 - 6 degrees; similarly, when there is a metal cover shell at the end of the motor, the heat generated by the winding coil is conducted to the metal cover shell, and the heat dissipation structure of this multi-cylinder air compressor can also significantly reduce the temperature of the metal cover shell, and further improve the heat dissipation effect on the motor.

[0017] In the above cylinder head heat dissipation structure of a multi-cylinder air compressor, this cylinder head heat dissipation structure further includes an outer shell. The motor is arranged in the outer shell. The air inlet is opened on the outer shell and is arranged close to the end of the motor. There are several air inlets, and all the air inlets are arranged at intervals along the circumference of the outer shell. Through the setting of this structure, the cooling air enters the outer shell along the circumference of the outer shell, that is, the cooling air blows on each position along the circumference of the end of the motor, effectively improving the heat dissipation effect on the end of the motor.

[0018] Compared with the prior art, the cylinder head heat dissipation structure of the multi-cylinder air compressor of the present utility model has the following advantages: The motor of this structure drives the axial flow fan blade to rotate. After the axial flow fan blade rotates, it blows air into the air cavity. Multiple ventilation openings are respectively connected to the air cavity, so that multiple air ducts are formed at the top of the air cavity. After the cooling air flows into the air cavity, it blows towards each cylinder head through each ventilation opening. The cooling air generated by the axial flow fan blade flows in the horizontal direction, thereby ensuring that the cooling air in the air cavity is relatively evenly divided into each ventilation opening, ensuring uniform heat dissipation for each cylinder head, and thus improving the heat dissipation effect on each cylinder head. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic cross-sectional structure diagram of the present utility model.

[0020] Figure 2 is one of the partial three-dimensional structure diagrams of the present utility model.

[0021] Figure 3 is the second of the partial three-dimensional structure diagrams of the present utility model.

[0022] Figure 4 is the third of the partial three-dimensional structure diagrams of the present utility model.

[0023] Figure 5 is the partial exploded structure diagram of the present utility model.

[0024] Figure 6 is the fourth of the partial three-dimensional structure diagrams of the present utility model.

[0025] Figure 7 is the fifth of the partial three-dimensional structure diagrams of the outer housing of the present utility model.

[0026] Figure 8 is the sixth of the partial three-dimensional structure diagrams of the outer housing of the present utility model.

[0027] In the figure, 1, crankcase; 100, cylinder seat; 101, air cavity; 102, ventilation opening; 2, axial flow fan blade; 3, motor; 30, stator core; 4, cylinder head; 40, cylinder; 41, valve plate; 42, cylinder head cover; 5, heat dissipation hole; 6, air inlet; 7, outer housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following are specific embodiments of the present utility model and in combination with the drawings, the technical solutions of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0029] As Figures 1 to 8As shown in the figure, the cylinder head cooling structure of this multi-cylinder air compressor includes a crankcase 1, an axial flow fan blade 2, and a motor 3 that drives the axial flow fan blade 2 to rotate. There are two crankcases 1. At least two cylinder seats 100 are provided at the top of the crankcase 1. A cylinder head 4 is provided on each cylinder seat 100. A wind cavity 101 is provided on one side of the crankcase 1 facing the motor 3. Each cylinder seat 100 has a ventilation opening 102 communicating with the wind cavity 101. The axial flow fan blade 2 is arranged between the end of the motor 3. The axial flow fan blade 2 can blow air into the wind cavity 101. When the air compressor is working, the motor 3 drives the axial flow fan blade 2 to rotate. After the axial flow fan blade 2 rotates, it blows air into the wind cavity 101. Multiple ventilation openings 102 communicate with the wind cavity 101 respectively, so that multiple air ducts are formed at the top of the wind cavity 101. After the cooling air flows into the wind cavity 101, it blows towards each cylinder head 4 through each ventilation opening 102. The cooling air generated by the axial flow fan blade 2 flows in the horizontal direction, thereby ensuring that the cooling air in the wind cavity 101 is relatively evenly distributed to each ventilation opening 102, ensuring uniform heat dissipation for each cylinder head 4, and thus improving the heat dissipation effect on each cylinder head 4.

[0030] There are three ventilation openings 102, and the interval angle of the three ventilation openings 102 is 90°. The wind cavity 101 extends more than two-thirds of the way through the center of the cylinder seat 100, and the wind cavity 101 extends between two adjacent cylinder seats 100.

[0031] As Figures 2 to 5As shown, valve plate support parts 103 are provided at the positions of the crankcase 1 corresponding to the cylinder bases 100. The cylinder head 4 includes a cylinder 40, a valve plate 41, and a cylinder head cover 42 arranged in sequence from bottom to top. The cylinder 40 is arranged on the cylinder base 100, the valve plate 41 is arranged on the valve plate support part 103. A plurality of ventilation openings 102 are formed in the part of the cylinder base 100 located in the air cavity 101. All the ventilation openings 102 are arranged at circumferential intervals around the lower end of the cylinder 40. All the ventilation openings 102 enclose at least more than one-third of the circumference of the lower end of the cylinder 40. A ventilation space 8 is formed between the outer side wall of the valve plate support part 103 and the outer peripheral surface of the cylinder 40. The heat dissipation holes 5 on the valve plate 41 communicate with the ventilation space 8, and the ventilation openings 102 communicate with the ventilation space 8. Since the ventilation openings 102 in this structure are arranged around the lower end of the cylinder 40, the cooling air flows around the outer peripheral surface of the cylinder 40 and along the axial direction of the cylinder 40. The cooling air has a large contact area with the outer peripheral surface of the cylinder 40, taking away the heat of the cylinder 40 and significantly improving the heat dissipation effect on the cylinder 40. Heat dissipation holes 5 are provided on both the valve plate 41 and the cylinder head cover 42. When the axial flow fan blade 2 rotates, the air can flow through the ventilation openings 102, then pass through the heat dissipation holes 5 on the valve plate 41 and the heat dissipation holes 5 on the cylinder head cover 42. The cooling air enters the cylinder base 100 along the periphery of the cylinder 40 and flows upward through the heat dissipation holes 5 on the valve plate 41 and the heat dissipation holes 5 on the cylinder head cover 42. This structure increases the circumferential contact area of the cooling air with the cylinder 40, and also increases the contact area with the valve plate 41 and the cylinder head cover 42, improving the cooling and heat dissipation effects on the cylinder 40, the valve plate 41, and the cylinder head cover 42.

[0032] As Figure 1 , Figure 6 and Figure 7As shown, the axial-flow fan blade 2 is disposed near the end of the motor 3. The cylinder head heat dissipation structure further includes an air inlet 6 located outside the motor 3. When the axial-flow fan blade 2 rotates, the outside air flows through the end of the motor 3 during the process of being blown into the air cavity 101 through the air inlet 6. In this embodiment, the cylinder head heat dissipation structure further includes an outer housing 7. The motor 3 is disposed inside the outer housing 7. The air inlet 6 is opened on the outer housing 7 and is disposed near the end of the motor 3. There are several air inlets 6, and all the air inlets 6 are spaced along the circumferential direction of the outer housing 7. After the axial-flow fan blade rotates, a negative pressure is formed on the side of the axial-flow fan blade 2 facing the end of the motor 3. The outside air is sucked into the air cavity 101 through the air inlet 6. Since the axial-flow fan blade 2 is disposed near the end of the motor 3, during the process of the cooling air flowing into the air cavity 101, when the winding coil at the end of the motor 3 is not covered by a metal cover, the cooling air flows through the winding coil circumferentially from the periphery of the winding coil, that is, the cooling air surrounds the winding coil, not only taking away the heat on the surface and periphery of the winding coil, but also the cooling air can penetrate into the internal gaps of the winding coil, so that the heat accumulated in the internal gaps of the winding coil is also sucked out by the negative pressure, significantly improving the cooling effect on the winding coil, and thus improving the cooling effect on the motor. Compared with the way that the air blown by the fan blade directly blows on the winding, this cooling method can more significantly reduce the temperature of the motor. It can be obtained from the experimental test data that the temperature of the motor drops by 4-6 degrees. Similarly, when there is a metal cover at the end of the motor, the heat generated by the winding coil is conducted to the metal cover, and the heat dissipation structure of this multi-cylinder air compressor can also significantly reduce the temperature of the metal cover, thereby improving the heat dissipation effect on the motor.

[0033] As Figure 1 and Figure 8 shown, the crankcase 1 has a closed intake cavity 9. An intake pipeline 10 is disposed in the air cavity 101. An air inlet is disposed on the inner wall of the crankcase 1, and a check valve 11 is disposed in the air inlet. One end of the intake pipeline 10 is connected to the check valve 11.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A cylinder head heat dissipation structure of a multi-cylinder air compressor, comprising a crankcase (1), an axial flow fan blade (2), and a motor (3) for driving the axial flow fan blade (2) to rotate. At least two cylinder seats (100) are provided at the top of the crankcase (1), and a cylinder head (4) is provided on each cylinder seat (100). The cylinder head (4) includes a cylinder (40), characterized in that, One side of the crankcase (1) facing the motor (3) has a wind cavity (101). Each cylinder block (100) has a ventilation opening (102) communicating with the wind cavity (101). The ventilation openings (102) are arranged circumferentially around the lower end of the cylinder (40). The axial flow fan blade (2) is arranged between the end of the motor (3) and the wind cavity (101), and the axial flow fan blade (2) can blow air into the wind cavity (101).

2. The cylinder head heat dissipation structure of a multi-cylinder air compressor according to claim 1, characterized in that, There are several ventilation openings (102). All the ventilation openings (102) are arranged at intervals circumferentially around the lower end of the cylinder (40), and all the ventilation openings (102) enclose at least more than one-third of the circumference of the lower end of the cylinder (40).

3. The cylinder head heat dissipation structure of a multi-cylinder air compressor according to claim 2, characterized in that, There are three ventilation openings (102), and the interval angle of the three ventilation openings (102) is 90°.

4. The cylinder head heat dissipation structure of a multi-cylinder air compressor according to claim 1, characterized in that, The wind cavity (101) extends to more than two-thirds of the center of the cylinder block (100).

5. The cylinder head heat dissipation structure of a multi-cylinder air compressor according to claim 1, characterized in that, The wind cavity (101) extends between two adjacent cylinder blocks (100).

6. The cylinder head heat dissipation structure of a multi-cylinder air compressor according to claim 1, characterized in that Valve plate support parts (103) are arranged at the positions of the crankcase (1) corresponding to the cylinder blocks (100). The cylinder head (4) includes a valve plate (41) and a cylinder head cover (42). The valve plate (41) is arranged on the valve plate support part (103). Heat dissipation holes (5) are arranged on both the valve plate (41) and the cylinder head cover (42). When the axial flow fan blade (2) rotates, the wind can flow through the ventilation opening (102) and then pass through the heat dissipation holes (5) on the valve plate (41) and the heat dissipation holes (5) on the cylinder head cover (42).

7. The cylinder head heat dissipation structure of a multi-cylinder air compressor according to claim 6, characterized in that, A ventilation space (8) is formed between the outer side wall of the valve plate support part (103) and the outer peripheral surface of the cylinder (40), and the heat dissipation holes (5) on the valve plate (41) communicate with the ventilation space (8).

8. The cylinder head heat dissipation structure of a multi-cylinder air compressor according to claim 1, characterized in that, An enclosed intake air cavity (9) is provided in the crankcase (1). An intake air pipeline (10) is arranged in the wind cavity (101). An intake air port is arranged on the inner wall of the crankcase (1), and a check valve (11) is arranged in the intake air port. One end of the intake air pipeline (10) is connected to the check valve (11).

9. The cylinder head heat dissipation structure of a multi-cylinder air compressor according to claim 1, characterized in that, The axial flow fan blade (2) is arranged near the end of the motor (3). This cylinder head heat dissipation structure further includes an air inlet (6) located outside the motor (3). When the axial flow fan blade (2) rotates, the outside wind flows through the end of the motor (3) during the process of being blown into the wind cavity (101) through the air inlet (6).

10. The cylinder head heat dissipation structure of a multi-cylinder air compressor according to claim 9, characterized in that, This cylinder head heat dissipation structure further includes an outer housing (7). The motor (3) is arranged in the outer housing (7). The air inlet (6) is opened on the outer housing (7) and is arranged near the end of the motor (3). There are several air inlets (6), and all the air inlets (6) are arranged at intervals along the circumference of the outer housing (7).

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