Air compressor

Abstract

The utility model provides an air compressor, and belongs to the technical field of air compression. The air compressor comprises a first crankcase, a motor stator, a rotor and a first cooling fan, the rotor comprises a motor shaft, and the first cooling fan can be driven by the motor shaft to rotate to generate cooling airflow; the air compressor further comprises a first air window, a first connecting rod, a first piston arranged at one end of the first connecting rod and a first air cylinder, the motor shaft drives the first connecting rod to move when rotating, the first crankcase is provided with a first connecting rod penetrating opening and a second opening corresponding to a first opening of the first air window, and the first baffle is connected to the circumferential edge of the first air window. The first baffle is located between the circumferential edge of the first air window and the first air cylinder, and the first baffle is installed on the second opening and blocks at least one part of the second opening. According to the design, the existing design with weak practicability is improved, and the design is more practical and more suitable for industrial application.

Description

Technical Field

[0001] The utility model relates to the technical field of air compression, in particular to an air compressor. Background Art

[0002] With the economic development and technological improvement, people's demand for air compressors is also increasing. It is mainly used in industries, construction, medical treatment, food and other fields to provide compressed gas for pneumatic tools (such as nail guns, pneumatic hammers, etc.). Since the use scenario of the air compressor is generally long-term operation, a large amount of heat will be generated during the operation process. Usually, a cooling fan is installed on the air compressor, and a wind window is installed at the opening of the crankcase end to prevent the cooling fan from hurting people. In order to facilitate the assembly of the crank connecting rod, a notch is generally opened at the end of the crankcase. In the existing products, the opening of the crankcase is shielded by the wind window to ensure safety and intake heat dissipation requirements. The design of the opening of the crankcase of the existing products is relatively simple, without making relevant or corresponding designs for the opening of the crankcase, and the practicability is weak. Content of the Utility Model

[0003] Aiming at the deficiencies in the design of the air compressor in the prior art, the utility model provides an air compressor, which improves the existing design on the basis of the prior art and is more practical and more suitable for industrial applications.

[0004] The utility model provides an air compressor, which includes a first crankcase, a motor stator, a rotor, a first cooling fan, a first wind window, a first connecting rod, a first piston arranged at one end of the first connecting rod, and a first cylinder. The rotor includes a motor shaft, and the first cooling fan can rotate under the drive of the motor shaft to generate a cooling air flow. When the motor shaft rotates, it drives the first connecting rod to move, and the first piston can reciprocate in the first cylinder under the drive of the first connecting rod. The characteristics are that the first crankcase is provided with a first connecting rod through hole, a first opening corresponding to the first wind window, and a second opening. The first wind window covers the first opening. The first connecting rod penetrates through the first connecting rod through hole. The second opening is directly connected to the first opening. The second opening extends from the circumferential edge of the first opening towards the first connecting rod and the first connecting rod through hole. The first opening is located at one end of the left and right ends of the first crankcase far from the motor stator. The first crankcase has a first cavity. The first cooling fan is located in the first cavity. The first cooling fan can rotate under the drive of the motor shaft to promote air to flow through the first wind window and enter the first cavity. The motor shaft extends into the first cavity. One end of the first connecting rod far from the first piston is located in the first cavity. The first connecting rod through hole communicates the inside of the first cylinder with the first cavity. The air compressor further includes a first baffle, which is located between the circumferential edge of the first wind window and the first cylinder, and the first baffle is installed on the second opening and blocks at least a part of the second opening.

[0005] Preferably, the air compressor further includes a second baffle, a first heat dissipation air outlet, and a first valve plate. The first baffle is connected to the circumferential edge of the first air window. The second baffle is located on the side of the first cylinder away from the stator. The second baffle is connected to one end of the first baffle away from the first air window, and the second baffle extends from the one end of the first baffle away from the first air window in a direction away from the rotation axis of the motor shaft. The first crankcase further includes a third opening located between the first valve plate and the second opening. The third opening extends from the second opening in a direction away from the rotation axis of the motor shaft. The second baffle is installed in the third opening and blocks a part of the third opening. The part of the third opening located between the second baffle and the first valve plate constitutes the first heat dissipation air outlet.

[0006] Preferably, the space between the first cylinder and the second baffle communicates between the first cavity and the first heat dissipation air outlet. The first baffle blocks a part of the second opening. Another part of the second opening is located between the space between the first cylinder and the second baffle and the first cavity, constituting the opening of the space between the first cylinder and the second baffle facing the first cavity. A part of the heat dissipation air flow generated by the first heat dissipation fan can flow from the first cavity through the another part of the second opening into the space between the first cylinder and the second baffle.

[0007] Preferably, the air compressor further includes a first cylinder head and a first cylinder part. One end of the first cylinder abuts against the edge of the first connecting rod through-hole. The first cylinder head, the first valve plate, and the first crankcase are arranged in sequence and fixed together by fastening elements. The first cylinder is clamped between the first crankcase and the first valve plate. The second opening is directly connected to the first opening and the first connecting rod through-hole. The second opening extends from the circumferential edge of the first opening to the first connecting rod through-hole and is directly connected to the second opening. And / or, at least part of the stator is located inside the first cylinder part. The first cylinder part surrounds the stator. The first cylinder part is connected to the side of the first crankcase away from the first opening. The first cylinder part is provided with a plurality of heat dissipation fins. The length direction of the heat dissipation fins and the central axis direction of the first cylinder part are parallel to the motor shaft. The first crankcase is provided with a number of first ventilation holes adjacent to the heat dissipation fins. Part of the heat dissipation air flow flows through the number of first ventilation holes. The number of first ventilation holes is located on the side of the first crankcase away from the first port.

[0008] Preferably, the first baffle, the second baffle, and the first air window are integrally connected in sequence. The first baffle, the second baffle, and the first air window are made of plastic material. The crankcase is made of metal material. The part of the third opening located between the free end of the second baffle away from the first baffle and the first valve plate constitutes the first heat dissipation air outlet.

[0009] Preferably, a plurality of first ventilation holes are further formed in the first crankcase. The plurality of first ventilation holes communicate between the first cavity and the first heat dissipation air outlet. A part of the heat dissipation air flow generated by the first heat dissipation fan can flow out of the first cavity and sequentially pass through the first ventilation holes and the first heat dissipation air outlet.

[0010] Preferably, a plurality of second heat dissipation air outlets are further provided. The plurality of second heat dissipation air outlets are formed between the first valve plate and the first crankcase. At least a part of the heat dissipation air flow generated by the first heat dissipation fan can flow out of the first cavity and sequentially pass through the first ventilation holes and the second heat dissipation air outlets; the first heat dissipation air outlet and the plurality of second heat dissipation air outlets are sequentially arranged in the circumferential direction around the central axis of the first cylinder.

[0011] Preferably, a plurality of hooks and a plurality of ribs are provided on the first air window. The plurality of hooks are adjacent to the circumferential edge of the first air window. The plurality of ribs are embedded in the first opening. Each hook is respectively and spacedly distributed between two adjacent ribs. A clamping hole cooperating with the hook is formed in the first crankcase; a plurality of buckles clamping the first crankcase are provided on the second baffle.

[0012] Preferably, the air compressor further includes a second connecting rod, a second piston provided at one end of the second connecting rod, and a second cylinder. When the motor shaft rotates, it drives the second connecting rod to move. The second piston can reciprocate in the second cylinder under the drive of the second connecting rod. The first crankcase is further provided with a second connecting rod through hole and a fourth opening. The second connecting rod passes through the second connecting rod through hole. The fourth opening is directly connected to the first opening. The fourth opening extends from the circumferential edge of the first opening towards the second connecting rod and the second connecting rod through hole; the end of the second connecting rod away from the second piston is located in the first cavity. The second connecting rod through hole directly communicates the inside of the second cylinder with the first cavity; the air compressor further includes a third baffle. The third baffle is connected to the circumferential edge of the first air window. The third baffle is located between the circumferential edge of the first air window and the second cylinder. The third baffle is installed on the fourth opening and blocks at least a part of the fourth opening; the first connecting rod through hole and the second connecting rod through hole are spacedly distributed in the circumferential direction around the rotation axis of the motor shaft. The second opening and the fourth opening are spacedly distributed in the circumferential direction around the rotation axis of the motor shaft. The first baffle and the third baffle are spacedly distributed in the circumferential direction around the rotation axis of the motor shaft. The end of the first connecting rod located in the first cavity is located on the side close to the first heat dissipation fan and the first opening of the end of the second connecting rod located in the first cavity.

[0013] Preferably, the air compressor further includes a fourth baffle, a third heat dissipation air outlet, and a second valve plate. The fourth baffle is located on the side of the second cylinder away from the stator. The fourth baffle is connected to one end of the third baffle away from the first air window. The fourth baffle extends from one end of the third baffle away from the first air window in a direction away from the rotation axis of the motor shaft. The third baffle, the fourth baffle, and the first air window are integrally connected in sequence. The second cylinder is clamped between the first crankcase and the second valve plate. The second connecting rod through-hole directly communicates the inside of the third cylinder and the first cavity. The first crankcase includes a fifth opening located between the second valve plate and the fourth opening. The fifth opening extends from the fourth opening in a direction away from the rotation axis of the motor shaft. The fourth baffle is installed in the fifth opening and blocks a part of the fifth opening. The part of the fifth opening located between the fourth baffle and the second valve plate forms the third heat dissipation air outlet. The space between the third cylinder and the fourth baffle communicates between the first cavity and the third heat dissipation air outlet. The third baffle blocks a part of the fourth opening. Another part of the fourth opening is located between the space between the second cylinder and the fourth baffle and the first cavity, forming an opening of the space between the second cylinder and the fourth baffle facing the first cavity. A part of the heat dissipation air flow generated by the first cooling fan flows from the first cavity through the said another part of the fourth opening into the space between the second cylinder and the fourth baffle. The length of the first baffle along the rotation axis of the motor shaft is shorter than the length of the third baffle along the rotation axis of the motor shaft. The second baffle and the fourth baffle are staggered in the circumferential direction around the rotation axis of the motor shaft. Taking a virtual plane perpendicular to the motor shaft and intersecting the stator as a reference plane, the perpendicular distance between the second baffle and the reference plane is greater than the perpendicular distance between the fourth baffle and the reference plane.

[0014] Based on this design, the first baffle of the air compressor blocks a part of the second opening, reducing the probability of sundries falling into the first cavity through the second opening and optimizing the deficiencies of the existing air compressor design. The existence of the first opening and the second opening facilitates the passage and installation of the first connecting rod into the first crankcase. It is more convenient and practical to assemble the first air window and the first baffle with respect to the first opening and the second opening after the first connecting rod is installed. Description of the Drawings

[0015] Figure 1 Isometric view of the air compressor of the embodiment;

[0016] Figure 2 Another isometric view of the air compressor of the embodiment;

[0017] Figure 3 Isometric view of the air compressor of the embodiment with the first air window removed;

[0018] Figure 4 Stereogram of the air compressor of the embodiment with the first wind window, first cylinder, first valve plate, first connecting rod, etc. removed;

[0019] Figure 5 A cross-sectional view of the air compressor of the embodiment;

[0020] Figure 6 A partially enlarged cross-sectional view of the air compressor of the embodiment;

[0021] Figure 7 A cross-sectional view of the air compressor of the embodiment along the rotation axis of the motor shaft;

[0022] Figure 8 Stereogram of the air compressor of the embodiment with the first wind window, first radiator fan, etc. removed;

[0023] Figure 9 A cross-sectional view of the air compressor of the embodiment perpendicular to the motor shaft;

[0024] Figure 10 Stereogram of the air compressor of the embodiment with the first wind window, first radiator fan, crank removed;

[0025] Figure 11 Another cross-sectional view of the air compressor of the embodiment perpendicular to the motor shaft;

[0026] Figure 12 Stereogram of the combined state of the motor stator, rotor, various connecting rods, radiator fan, etc. of the air compressor of the embodiment;

[0027] Figure 13 Stereogram of the combined state of the first crankcase, first wind window, first valve plate, etc. of the air compressor of the embodiment;

[0028] Figure 14 Stereogram of the combined state of the first crankcase, first valve plate, first cylinder head, etc. of the air compressor of the embodiment;

[0029] Figure 15 Stereogram of the first crankcase of the air compressor of the embodiment at an angle of the first cylinder part;

[0030] Figure 16 Stereogram of the first crankcase of the air compressor of the embodiment at another angle of the first cylinder part;

[0031] Figure 17 Stereogram of the first crankcase of the air compressor of the embodiment at yet another angle of the first cylinder part;

[0032] Figure 18 Stereogram of the first wind window, first baffle, second baffle of the air compressor of the embodiment connected together at an angle;

[0033] Figure 19 Another perspective three-dimensional view of the first air window, first baffle, and second baffle of the air compressor according to the embodiment;

[0034] Figure 20 Separate state diagram of the first valve plate and sealing ring of the air compressor according to the embodiment;

[0035] Figure 21 One perspective three-dimensional view of the first valve plate of the air compressor according to the embodiment. Detailed implementation manners

[0036] The following further describes the present utility model in detail

[0037] According to Figure 1-8 As shown, the air compressor includes a first crankcase 2, a motor stator 3, a rotor 4, a first cooling fan 42, a first air window 28, a first connecting rod 51, a first piston 55 provided at one end of the first connecting rod 51, and a first cylinder 5. The rotor 4 includes a motor shaft 41. The first cooling fan 42 can rotate under the drive of the motor shaft 41 to generate a cooling air flow; the motor shaft 41 has a rotation axis a, and the rotation axis a is a virtual straight line, equivalent to the central axis around which the motor shaft 41 rotates. When the motor shaft 41 rotates around the rotation axis a, it drives the first connecting rod 51 to move, and the first piston 55 can reciprocate in the first cylinder 5 under the drive of the first connecting rod 51, thereby generating compressed air.

[0038] The first crankcase 2 has a first cavity 25. The first cooling fan 42 is located in the first cavity 25. The first cooling fan 42 rotates under the drive of the motor shaft 41 to promote air to flow through the first air window 28 and enter the first cavity 25, thereby forming a cooling air flow.

[0039] The first crankcase 2 is provided with a first connecting rod through-hole 22, a first opening 23 corresponding to the first air window 28, and a second opening 216. The first air window 28 covers the first opening 23. The first air window 28 can be breathable, and air can enter the first cavity 25 of the first crankcase 2 from the first air window 28. In addition, the first air window 28 can also prevent the staff from being injured by the rotating first cooling fan 42, improving safety.

[0040] The first connecting rod 51 passes through the first connecting rod through-hole 22. The second opening 216 is directly connected to the first opening 23. The second opening 216 extends from the circumferential edge of the first opening 23 towards the first connecting rod 51 and the first connecting rod through-hole 22. The first opening 23 is located at one end of the left and right ends of the first crankcase 2 that is far from the motor stator 3. The second opening 216 connects the first opening 23 and the first connecting rod through-hole 22. The second opening 216 extends from the circumferential edge of the first opening 23 to the first connecting rod through-hole 22 and is directly connected to the second opening 216. Usually during the assembly process of the air compressor, the first connecting rod 51 first passes through the first opening 23 and the second opening 216, and thus is inserted into the first cavity 25 of the first crankcase 2. Then one end of the first connecting rod 51 together with the first piston 55 extends into the first cylinder 5. Then the first cylinder 5 is clamped between the first valve plate 52 and the first crankcase 2. Finally, the first cylinder head 53, the first valve plate 52, and the first crankcase 2 are locked together with fastening elements (such as long screws). In this state, the first cylinder 5 is firmly clamped and positioned.

[0041] The first connecting rod 51 passes through the first connecting rod through-hole 22. The second opening 216 is directly connected to the first opening 23. The second opening 216 extends from the circumferential edge of the first opening 23 towards the first connecting rod 51 and the first connecting rod through-hole 22. The first opening 23 is located at one end of the left and right ends of the first crankcase 2 that is far from the motor stator 3.

[0042] The motor shaft 41 extends into the first cavity 25. One end of the first connecting rod 51 that is far from the first piston 55 is located in the first cavity 25. The first connecting rod through-hole 22 directly communicates the inside of the first cylinder 5 with the first cavity 25. The air compressor further includes a first baffle 286. The first baffle 286 is connected to the circumferential edge of the first air window 28. The first baffle 286 is located between the circumferential edge of the first air window 28 and the first cylinder 5. The first baffle 286 is installed in the second opening 216 and blocks at least a part of the second opening 216. When the first cooling fan 42 is driven by the motor shaft 41, part of the cooling air flow can flow out from the first cavity 25 through a part of the second opening 216, carrying heat for heat dissipation.

[0043] The air compressor further includes a second baffle 287, a first heat dissipation air outlet 521, and a first valve plate 52. The second baffle 287 is located on the side of the first cylinder 5 away from the motor stator 3. The second baffle 287 is connected to the end of the first baffle 286 away from the first air window 28, and the second baffle 287 extends from the end of the first baffle 286 away from the first air window 28 in a direction away from the rotation axis a of the motor shaft 41. The first crankcase 2 includes a third opening 213, and the third opening 213 is located between the first valve plate 52 and the second opening 216. The third opening 213 extends from the second opening 216 in a direction away from the rotation axis a of the motor shaft 41. The second baffle 287 is installed in the third opening 213 and blocks a part of the third opening 213. The part of the third opening 213 located between the second baffle 287 and the first valve plate 52 forms the first heat dissipation air outlet 521.

[0044] The gap between the first cylinder 5 and the second baffle 287 is communicated between the first cavity 25 and the first heat dissipation air outlet 521; the first baffle 286 blocks a part of the second opening 216, and another part of the second opening 216 is located between the gap between the first cylinder 5 and the second baffle 287 and the first cavity 25, forming an opening of the gap between the first cylinder 5 and the second baffle 287 facing the first cavity 25. A part of the heat dissipation air flow generated by the first heat dissipation fan 42 flows from the first cavity 25 through the said another part of the second opening 216 into the said gap between the first cylinder 5 and the second baffle 287. Part of the heat dissipation air flow flows out from the first heat dissipation air outlet 521, carrying heat, from the first cavity 25, through the gap.

[0045] The air compressor further includes a first cylinder head 53. One end of the first cylinder 5 abuts against the edge of the first connecting rod through-hole 22. The first cylinder head 53, the first valve plate 52, and the first crankcase 2 are arranged in sequence and fixed together by fastening elements. The first cylinder 5 is clamped between the first crankcase 2 and the first valve plate 52. A sealing ring 54 is provided between one end of the first cylinder 5 away from the first connecting rod through-hole 22 and the first valve plate 52. The sealing ring 54 can enhance the sealing effect between the first valve plate 52 and the first cylinder 5. The first valve plate 52 is provided with an air intake through-hole 522, an air exhaust through-hole 523, a first spring piece 524 corresponding to closing the air intake through-hole 522, and a second spring piece 525 corresponding to closing the air exhaust through-hole 523. When the first piston 55 in the first cylinder 5 makes a reciprocating piston movement to compress air, during the intake stroke, the first piston 55 moves away from the first valve plate 52 to intake air, so that the air flows through the air intake through-hole 522 and simultaneously pushes open the first spring piece 524 to enter the first cylinder 5; during the compression stroke, the first piston 55 moves towards the first valve plate 52 to compress air, so that the compressed air flows through the air exhaust through-hole 523 and simultaneously pushes open the second spring piece 525 to flow into one of the chambers of the first cylinder head 53.

[0046] The first baffle 286, the second baffle 287, and the first air window 28 are integrally connected in sequence. The first baffle 286, the second baffle 287, and the first air window 28 are made of plastic material, and the crankcase is made of metal material (such as steel material). The part of the third opening 213 located between the free end of the second baffle 287 away from the first baffle 286 and the first valve plate 52 constitutes the first heat dissipation air outlet 521. The first heat dissipation air outlet 521 is conducive to a part of the heat dissipation air flow flowing from the first cavity 25 through the said another part of the second opening 216 into the space between the first cylinder 5 and the second baffle 287, and through this space, carrying heat and flowing out from the first heat dissipation air outlet 521.

[0047] The first crankcase 2 is provided with a number of first ventilation holes 26, and the number of first ventilation holes 26 is communicated between the first cavity 25 and the first heat dissipation air outlet 521. A part of the heat dissipation air flow generated by the first heat dissipation fan 42 can flow from the first cavity 25 through the first ventilation holes 26 and the first heat dissipation air outlet 521 in sequence, and thus be discharged to the outside.

[0048] The first crankcase 2 is provided with a number of second heat dissipation air outlets 27, and the number of second heat dissipation air outlets 27 is opened between the first valve plate 52 and the first crankcase 2. At least a part of the heat dissipation air flow generated by the first heat dissipation fan 42 can flow out from the first cavity 25 of the first crankcase 2 through the first ventilation holes 26 and the second heat dissipation air outlets 27, and thus be discharged to the outside; the first heat dissipation air outlet 521 and the number of second heat dissipation air outlets 27 are arranged in sequence in the circumferential direction around the central axis of the first cylinder 5. The first heat dissipation air outlet 521 and the number of second heat dissipation air outlets 27 increase the flow rate of the heat dissipation air flow and enhance the heat dissipation effect.

[0049] A number of hooks 283 and a number of ribs 285 are provided on the first air window 28. The number of hooks 283 is adjacent to the circumferential edge of the first air window 28. The number of ribs 285 is embedded in the first opening 23. Each hook 283 is respectively and spacedly distributed between two adjacent ribs 285. The first crankcase 2 is provided with engaging holes 29 that can cooperate with the hooks 283. A number of buckles 284 that can be clamped on the first crankcase 2 are provided on the second baffle 287. The hooks 283 and the buckles 284 are conducive to the installation of the first air window 28 at the first opening 23. The cooperative design of the first baffle 286, the second baffle 287, the hooks 283, the buckles 284 with the first air window 28 and the first crankcase 2 improves the design defects of the existing products for the opening of the crankcase of the air compressor and is more suitable for industrial applications.

[0050] The air compressor further includes a first cylinder part 44, at least a part of the motor stator 3 is located inside the first cylinder part 44, the first cylinder part 44 surrounds the motor stator 3, the first cylinder part 44 is located on the side of the first crankcase 2 away from the first opening 23, a plurality of heat dissipation fins 210 are fixedly arranged circumferentially on the first cylinder part 44, the length direction of the heat dissipation fins 210 and the central axis direction of the first cylinder part 44 are parallel to the motor shaft 41; the first crankcase 2 is provided with a number of first ventilation holes 21, the first ventilation holes 21 are adjacent to the heat dissipation fins 210, and the number of first ventilation holes 21 extends along the length direction of the heat dissipation fins 210, and part of the heat dissipation air flow passes through the number of first ventilation holes 21 and flows through the surface of the heat dissipation fins 210, taking away the heat of the heat dissipation fins 210, so as to dissipate heat from the motor stator 3 surrounded by the first cylinder part 44, and the number of first ventilation holes 21 is located on the side of the first crankcase 2 away from the first port. The plurality of heat dissipation fins 210 increase the heat transfer area, which is beneficial to the first crankcase 2 to conduct heat to the plurality of heat dissipation fins 210 and increases the heat transfer effect.

[0051] The air compressor further includes a second connecting rod 61, a second piston 62 provided at one end of the second connecting rod 61, a second cylinder 6, and a third baffle 288. When the motor shaft 41 rotates, it drives the second connecting rod 61 to move, and the second piston 62 can reciprocate in the second cylinder 6 under the drive of the second connecting rod 61, thereby generating compressed air.

[0052] The first crankcase 2 is further provided with a second connecting rod 61 through hole 217 and a fourth opening 218. The second connecting rod 61 penetrates through the second connecting rod 61 through hole 217, and the fourth opening 218 is directly connected to the first opening 23. The fourth opening 218 extends from the circumferential edge of the first opening 23 towards the second connecting rod 61 and the second connecting rod 61 through hole 217; the end of the second connecting rod 61 away from the second piston 62 is located in the first cavity 25, and the second connecting rod 61 through hole 217 directly communicates the inside of the second cylinder 6 with the first cavity 25; the fourth opening 218 connects the first opening 23 and the second connecting rod 61 through hole 217, and the fourth opening 218 extends from the circumferential edge of the first opening 23 to the second connecting rod 61 through hole 217 and is directly connected to the fourth opening 218. During the assembly process of the air compressor, the fourth opening 218 is beneficial to the assembly of the second connecting rod 61.

[0053] The third baffle 288 is connected to the circumferential edge of the first air window 28. The third baffle 288 is located between the circumferential edge of the first air window 28 and the second cylinder 6. The third baffle 288 is installed at the fourth opening 218 and blocks at least a part of the fourth opening 218; when the first heat dissipation fan 42 is driven by the motor shaft 41, part of the heat dissipation air flow can flow out from the first cavity 25, through a part of the fourth opening 218, carrying heat for heat dissipation.

[0054] The first connecting rod through-hole 22 and the second connecting rod 61 through-hole 217 are circumferentially spaced apart around the rotation axis a of the motor shaft 41. The second opening 216 and the fourth opening 218 are circumferentially spaced apart around the rotation axis a of the motor shaft 41. The first baffle 286 and the third baffle 288 are circumferentially spaced apart around the rotation axis a of the motor shaft 41. One end of the first connecting rod 51 located in the first cavity 25 is located on the side close to the first cooling fan 42 and the first opening 23 of one end of the second connecting rod 61 located in the first cavity 25.

[0055] The air compressor further includes a fourth baffle 289 and a third heat dissipation air outlet 65. The fourth baffle 289 is located on the side of the second cylinder 6 away from the motor stator 3. The fourth baffle 289 is connected to the end of the third baffle 288 away from the first air window 28. The fourth baffle 289 extends from the end of the third baffle 288 away from the first air window 28 in a direction away from the rotation axis a of the motor shaft 41. The third baffle 288, the fourth baffle 289, and the first air window 28 are integrally connected in sequence.

[0056] One end of the second cylinder 6 abuts against the edge of the second connecting rod 61 through-hole 217. The air compressor further includes a second valve plate 63 and a second cylinder head 64. The second cylinder head 64, the second valve plate 63, and the first crankcase 2 are arranged in sequence and fixed together by fastening elements. The second cylinder 6 is clamped between the first crankcase 2 and the second valve plate 63. The second connecting rod 61 through-hole 217 directly communicates with the inside of the third cylinder and the first cavity 25. The first crankcase 2 includes a fifth opening 67. The fifth opening 67 is located between the second valve plate 63 and the fourth opening 218. The fifth opening 67 extends from the fourth opening 218 in a direction away from the rotation axis a of the motor shaft 41. The fourth baffle 289 is installed in the fifth opening 67 and blocks a part of the fifth opening 67. The part of the fifth opening 67 located between the fourth baffle 289 and the second valve plate 63 constitutes the third heat dissipation air outlet 65. Part of the heat dissipation air flow can pass through the unblocked part of the fifth opening 67 and be discharged through the third heat dissipation air outlet 65.

[0057] The first crankcase 2 is also provided with a plurality of second ventilation holes 219. The plurality of second ventilation holes 219 communicate between the first cavity 25 and the third heat dissipation air outlet 65. A part of the heat dissipation air flow generated by the first heat dissipation fan 42 can flow from the first cavity 25 through the second ventilation holes 219 and the third heat dissipation air outlet 65 in sequence and then be discharged to the outside; the gap between the third cylinder and the fourth baffle 289 communicates between the first cavity 25 and the third heat dissipation air outlet 65; the third baffle 288 blocks a part of the fourth opening 218, and another part of the fourth opening 218 is located between the gap between the second cylinder 6 and the fourth baffle 289 and the first cavity 25, forming an opening of the gap between the second cylinder 6 and the fourth baffle 289 facing the first cavity 25. A part of the heat dissipation air flow generated by the first heat dissipation fan 42 flows from the first cavity 25 into the gap between the second cylinder 6 and the fourth baffle 289 through the said another part of the fourth opening 218. The first crankcase 2 is also provided with a plurality of fourth heat dissipation air outlets 66. The plurality of fourth heat dissipation air outlets 66 are opened between the second valve plate 63 and the first crankcase 2. At least a part of the heat dissipation air flow generated by the first heat dissipation fan 42 can flow out from the first cavity 25 of the first crankcase 2 through the second ventilation holes 219 and the fourth heat dissipation air outlets 66, and then be discharged to the outside; the third heat dissipation air outlet 65 and the plurality of fourth heat dissipation air outlets 66 are arranged in sequence in the circumferential direction around the central axis of the second cylinder 6. The third heat dissipation air outlet 65 and the plurality of fourth heat dissipation air outlets 66 increase the flow rate of the heat dissipation air flow and enhance the heat dissipation effect.

[0058] The length of the first baffle 286 along the rotation axis a of the motor shaft 41 is shorter than the length of the third baffle 288 along the rotation axis a of the motor shaft 41. The second baffle 287 and the fourth baffle 289 are staggered in the circumferential direction around the rotation axis a of the motor shaft 41. Taking a virtual plane perpendicular to the motor shaft 41 and intersecting the motor stator 3 as a reference plane, the perpendicular distance between the second baffle 287 and the reference plane is greater than the perpendicular distance between the fourth baffle 289 and the reference plane.

[0059] The air compressor further includes a first bearing 80 corresponding to the first connecting rod 51, a second bearing 81 corresponding to the second connecting rod 61, and a crank 82. The first bearing 80, the second bearing 81, and the crank 82 are all located in the first cavity 25. One end of the first connecting rod 51 is sleeved and fixed on the outer ring of the first bearing 80, and the inner ring of the first bearing 80 is sleeved and fixed on the crank 82; one end of the second connecting rod 61 is sleeved and fixed on the outer ring of the second bearing 81, and the inner ring of the second bearing 81 is sleeved and fixed on the crank 82; the motor shaft 41 penetrates through the crank 82 and is fixed to the crank 82; the first heat dissipation fan 42 is fixed to one end of the motor shaft 41.

[0060] The air compressor is an air compressor with four cylinders. The air compressor further includes a second crankcase 7. The first cylinder 5 and the second cylinder 6 are both located on the first crankcase 2, and the remaining two cylinders are both located on the second crankcase 7. The first crankcase 2 and the second crankcase 7 are symmetrically arranged on the left and right sides of the air compressor. The air compressor further includes a second cooling fan 46. When the second cooling fan 46 rotates coaxially with the first cooling fan 42, an air flow flowing in the opposite direction to the first cooling fan 42 is generated. The first crankcase 2 of the air compressor has the structure, mating components and achieved functions, and the second crankcase 7 also has them. The configuration of the four-cylinder air compressor regarding the crankcase, connecting rod, piston, cylinder, cylinder head, bearing, crank, etc. on the left and right sides is the same.

[0061] Lifting handles 211 are fixedly arranged on the first crankcase 2 and the second crankcase 7, which is convenient for transportation and carrying. Bases 212 are arranged on both the first crankcase 2 and the second crankcase 7, which is beneficial to the stable placement of the air compressor. A control box 215 is arranged on the first crankcase 2 and the second crankcase 7, which is used to control the operation, start and stop of the air compressor.

[0062] The above embodiments are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope defined by the claims of the present invention.

Claims

1. An air compressor, comprising a first crankcase, a motor stator, a rotor, a first cooling fan, a first air window, a first connecting rod, a first piston disposed at one end of the first connecting rod, and a first cylinder. The rotor includes a motor shaft, and the first cooling fan can rotate under the drive of the motor shaft to generate a cooling air flow; when the motor shaft rotates, it drives the first connecting rod to move, and the first piston can reciprocate in the first cylinder under the drive of the first connecting rod, characterized in that, The first crankcase is provided with a first connecting rod through-hole, a first opening corresponding to the first air window, and a second opening. The first air window covers the first opening. The first connecting rod penetrates through the first connecting rod through-hole. The second opening is directly connected to the first opening. The second opening extends from the circumferential edge of the first opening towards the first connecting rod and the first connecting rod through-hole. The first opening is located at one end of the left and right ends of the first crankcase away from the motor stator. The first crankcase has a first cavity. The first cooling fan is located in the first cavity. The first cooling fan can be driven by the motor shaft to rotate, so as to promote air to flow through the first air window and enter the first cavity. The motor shaft extends into the first cavity. One end of the first connecting rod away from the first piston is located in the first cavity. The first connecting rod through-hole communicates the inside of the first cylinder with the first cavity. The air compressor further includes a first baffle. The first baffle is located between the circumferential edge of the first air window and the first cylinder. The first baffle is installed on the second opening and blocks at least a part of the second opening.

2. The air compressor according to claim 1, characterized in that, It further includes a second baffle, a first cooling air outlet, and a first valve plate. The first baffle is connected to the circumferential edge of the first air window. The second baffle is located on the side of the first cylinder facing away from the stator. The second baffle is connected to one end of the first baffle away from the first air window. The second baffle extends from the one end of the first baffle away from the first air window in a direction away from the rotation axis of the motor shaft. The first crankcase further includes a third opening. The third opening is located between the first valve plate and the second opening. The third opening extends from the second opening in a direction away from the rotation axis of the motor shaft. The second baffle is installed on the third opening and blocks a part of the third opening. The part of the third opening located between the second baffle and the first valve plate constitutes the first cooling air outlet.

3. The air compressor according to claim 2, characterized in that, The gap between the first cylinder and the second baffle communicates between the first cavity and the first cooling air outlet. The first baffle blocks a part of the second opening. Another part of the second opening is located between the gap between the first cylinder and the second baffle and the first cavity, constituting the opening of the gap between the first cylinder and the second baffle facing the first cavity. A part of the cooling air flow generated by the first cooling fan can flow from the first cavity through the another part of the second opening into the gap between the first cylinder and the second baffle.

4. The air compressor according to claim 2 or 3, characterized in that, It further includes a first cylinder head and a first cylindrical part. One end of the first cylinder abuts against the edge of the first connecting rod through-hole. The first cylinder head, the first valve plate, and the first crankcase are arranged in sequence and fixed together by fastening elements. The first cylinder is clamped between the first crankcase and the first valve plate. The second opening is directly connected to the first opening and the first connecting rod through-hole. The second opening extends from the circumferential edge of the first opening to the first connecting rod through-hole and is directly connected to the second opening. And / or, at least part of the stator is located inside the first cylinder part, the first cylinder part surrounds the stator, and the first cylinder part is connected to the side of the first crankcase away from the first opening; the first cylinder part is provided with a plurality of heat dissipation fins, the length direction of the heat dissipation fins and the central axis direction of the first cylinder part are parallel to the motor shaft; the first crankcase is provided with a plurality of first ventilation holes, the first ventilation holes are adjacent to the heat dissipation fins, and part of the heat dissipation air flow passes through the plurality of first ventilation holes, and the plurality of first ventilation holes are located on the side of the first crankcase away from the first port.

5. The air compressor according to claim 2 or 3, characterized in that, The first baffle plate, the second baffle plate, and the first air window are integrally connected in sequence. The first baffle plate, the second baffle plate, and the first air window are made of plastic material, and the crankcase is made of metal material. The part of the third opening located between the free end of the second baffle plate away from the first baffle plate and the first valve plate constitutes the first heat dissipation air outlet.

6. The air compressor according to claim 2 or 3, characterized in that, The first crankcase is further provided with a plurality of first ventilation holes, and the plurality of first ventilation holes communicate between the first cavity and the first heat dissipation air outlet. A part of the heat dissipation air flow generated by the first heat dissipation fan can flow out of the first cavity and sequentially pass through the first ventilation holes and the first heat dissipation air outlet.

7. The air compressor according to claim 6, characterized in that, There are also a plurality of second heat dissipation air outlets, and the plurality of second heat dissipation air outlets are opened between the first valve plate and the first crankcase. At least a part of the heat dissipation air flow generated by the first heat dissipation fan can flow out of the first cavity and sequentially pass through the first ventilation holes and the second heat dissipation air outlets; the first heat dissipation air outlet and the plurality of second heat dissipation air outlets are arranged in sequence in the circumferential direction around the central axis of the first cylinder.

8. The air compressor according to claim 2 or 3, characterized in that, A plurality of hooks and a plurality of ribs are arranged on the first air window. The plurality of hooks are adjacent to the circumferential edge of the first air window. The plurality of ribs are embedded in the first opening. Each hook is respectively distributed at intervals between two adjacent ribs. The first crankcase is provided with card holes that cooperate with the hooks; a plurality of buckles that are clamped on the first crankcase are arranged on the second baffle plate.

9. The air compressor according to claim 2 or 3, characterized in that, It further includes a second connecting rod, a second piston provided at one end of the second connecting rod, and a second cylinder. When the motor shaft rotates, it drives the second connecting rod to move. The second piston can reciprocate in the second cylinder under the drive of the second connecting rod. The first crankcase is further provided with a second connecting rod through hole and a fourth opening. The second connecting rod passes through the second connecting rod through hole. The fourth opening is directly connected to the first opening. The fourth opening extends from the circumferential edge of the first opening towards the second connecting rod and the second connecting rod through hole; the end of the second connecting rod away from the second piston is located in the first cavity, and the second connecting rod through hole directly communicates the inside of the second cylinder with the first cavity; The air compressor further includes a third baffle plate, and the third baffle plate is connected to the circumferential edge of the first air window. The third baffle plate is located between the circumferential edge of the first air window and the second cylinder. The third baffle plate is installed at the fourth opening and blocks at least a part of the fourth opening; The first connecting rod opening and the second connecting rod opening are spaced apart in the circumferential direction around the rotation axis of the motor shaft, the second opening and the fourth opening are spaced apart in the circumferential direction around the rotation axis of the motor shaft, the first baffle plate and the third baffle plate are spaced apart in the circumferential direction around the rotation axis of the motor shaft, and one end of the first connecting rod located in the first cavity is located on a side of the end of the second connecting rod located in the first cavity close to the first cooling fan and the first opening.

10. The air compressor according to claim 9, characterized in that, It also includes a fourth baffle, a third heat dissipation outlet, and a second valve plate, wherein the fourth baffle is located on a side of the second cylinder away from the stator, the fourth baffle is connected to an end of the third baffle away from the first wind window, the fourth baffle extends from the end of the third baffle away from the first wind window in a direction away from the rotation axis of the motor shaft, and the third baffle, the fourth baffle, and the first wind window are connected in sequence as one piece; The second cylinder is clamped between the first crankcase and the second valve plate, and the second connecting rod through-hole is directly connected to the inside of the third cylinder and the first cavity; the first crankcase includes a fifth opening, the fifth opening is located between the second valve plate and the fourth opening, the fifth opening extends from the fourth opening in a direction away from the rotation axis of the motor shaft, the fourth baffle is installed on the fifth opening and blocks a part of the fifth opening, and the part of the fifth opening located between the fourth baffle and the second valve plate constitutes the third heat dissipation outlet; The gap between the third cylinder and the fourth baffle is connected between the first cavity and the third heat dissipation outlet; the third baffle blocks a portion of the fourth opening, another portion of the fourth opening is located between the gap between the second cylinder and the fourth baffle and the first cavity, forming an opening of the gap between the second cylinder and the fourth baffle toward the first cavity; a portion of the heat dissipation airflow generated by the first heat dissipation fan flows from the first cavity into the gap between the second cylinder and the fourth baffle via the another portion of the fourth opening; The length of the first baffle along the direction of the rotation axis of the motor shaft is shorter than the length of the third baffle along the direction of the rotation axis of the motor shaft, and the second baffle and the fourth baffle are staggered in the circumferential direction around the rotation axis of the motor shaft; taking a virtual plane perpendicular to the motor shaft and intersecting with the stator as a reference plane, a vertical distance between the second baffle and the reference plane is greater than a vertical distance between the fourth baffle and the reference plane.

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