An air compressor

Abstract

The present invention proposes an air compressor, including a motor, at least one connecting sleeve, a housing, an end cover and an air compression component, wherein the connecting sleeve is provided with a heat dissipation channel, the connecting sleeve is connected to the housing at one end to form an external cavity, and a fan blade is provided on the motor shaft in the external cavity; the other end of the connecting sleeve is connected to the motor, the connecting sleeve is provided with a blocking portion for blocking particles, and the connecting sleeve is connected to the outside and the external cavity; the air compression component is installed in the internal cavity and connected to the motor shaft, the air compression component and the internal cavity form a closed space, and the internal cavity is provided with a compressed air inlet; the top periphery of the air compression component is provided with a plurality of vents connected to the external cavity outlet. The present invention can effectively dissipate heat to the motor end coil and the blind spots, and at the same time dissipate heat to the housing and the air compression component, so as to reduce the temperature rise of the motor and the cooling of the air compression component.

Description

Technical Field

[0001] The invention relates to the field of air compressors, and in particular to an air compressor. Background Art

[0002] An air compressor is an air source device that compresses air. Taking a piston air compressor as an example, when working, the outside air is sucked into the cylinder, and then the air in the cylinder is compressed by the piston to obtain high-pressure gas. Among them, the cylinder generally includes a cylinder sleeve, a piston chamber is opened in the cylinder sleeve, the piston is installed in the piston chamber, a valve plate is installed on the upper end of the piston chamber, a cylinder head is installed above the valve plate, an air inlet chamber and an air outlet chamber are arranged in the cylinder head, a one-way valve plate is installed between the air inlet chamber and the piston chamber, and a one-way valve plate is also installed between the piston chamber and the air outlet chamber. When working, the piston moves downward, sucking the outside air into the piston chamber through the air inlet chamber, and then the piston moves upward to compress the air in the piston chamber. When the air pressure in the piston chamber reaches a certain level, the compressed air pushes open the one-way valve plate to enter the air outlet chamber, and enters the air storage tank through the pipeline.

[0003] In the process of compressing air, the heat mainly comes from the heat generated by the air during the compression process and the motor. During operation, the inhaled air is gradually compressed, generating a large amount of heat, the air temperature itself rises, and the heat is transferred to the cylinder liner, valve plate and cylinder head. The cylinder head is at the outer end of the cylinder, which can dissipate the heat transferred to the cylinder head. During the working process, the higher the temperature of the cylinder head, the less conducive it is for the compressed air in the cylinder head outlet cavity to transfer heat to the cylinder head for heat dissipation. Long-term operation at high temperature will shorten the service life of the cylinder and piston seals.

[0004] In the prior art, on the one hand, as shown in the patent document with publication number: CN210637212U, the fan blades in the air compressor are usually far away from the motor, and the air compression components and the box support position block a part of the air duct. The effect of positive pressure blowing on the motor through the fan blades is poor, which can easily lead to temperature rise; on the other hand, as shown in the patent document with publication number: CN220667771U, the fan blades are set between the motor and the crankcase, which can only perform positive pressure heat dissipation on the motor, resulting in the inability to fully dissipate the heat of the enameled wire, and the inability to dissipate heat from the cylinder, cylinder head and other parts at the same time. In addition, the coils in the above two patent documents are fully open structures, so that the motor coils are in direct contact with the airflow entering the box from the air inlet, which can easily lead to particle debris entering the coils, especially metal particles attached to the coils, which can easily cause the motor to short-circuit and burn.

[0005] In addition, as shown in the patent document with publication number CN107461314A, it discloses an internal suction oil-free piston brake air pump, including a permanent magnet motor, a supporting volute is installed on both sides of the permanent magnet motor, and a main shaft connected to the permanent magnet motor is installed in the supporting volute; a wind wheel is arranged on the main shaft; an eccentric wheel is installed at the end of the main shaft away from the permanent magnet motor, and a piston assembly is connected to the eccentric shaft of the eccentric wheel, and a closed cylinder body is installed on both sides of the piston assembly. Combined with the drawings of the document, it can be seen that the motor coil relative to the wind wheel in the patent is a fully enclosed structure, the heat dissipation effect is poor, and the motor power output torque is greater than the power (input torque) required by the air compressor, which is more than 1.3 times, resulting in high cost and waste of resources. In addition, the heat dissipation duct layout of the scheme is unreasonable, and the cylinder assembly cannot be evenly dissipated. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an air compressor.

[0007] The present invention proposes an air compressor, comprising a motor, at least one connecting sleeve, a casing and an air compression component, wherein the casing is provided with an air compression component; the connecting sleeve comprises a blocking portion, and the blocking portion is arranged around the axis of the motor; the blocking portion has a heat dissipation channel, and a fan blade is arranged in the casing or the connecting sleeve, and when the fan blade rotates, a negative pressure space is formed at the heat dissipation channel to dissipate the heat of the coil of the motor.

[0008] Preferably, the box body has an inner cavity and an outer cavity structure; the outer cavity is connected to the heat dissipation channel, the fan blades are accommodated in the outer cavity, and the air compression component is installed on the inner cavity.

[0009] Preferably, the outer cavity specifically includes a boost chamber and a filter chamber, the fan blade is installed in the boost chamber, the boost chamber is connected to the filter chamber, and the filter chamber is connected to the inner cavity.

[0010] Preferably, the outer cavity extends to the upper cylinder of the air compression component, and the gas flowing through the outer cavity dissipates heat to the air compression component. The outer wall of the cylinder is surrounded by the outer cavity, making the heat conduction efficiency higher and more direct, and being able to effectively dissipate heat to the outer periphery of the cylinder.

[0011] Preferably, ventilation holes for air intake are provided on the outer wall of the connecting sleeve.

[0012] Preferably, the ventilation hole is opened in the radial direction or the axial direction of the connecting sleeve.

[0013] Preferably, a guide plate is arranged inside the connecting sleeve, and the guide plate is arranged in a spiral leaf shape, and the guide plate can form a cyclone-like airflow between the connecting sleeve and the fan blade.

[0014] Preferably, the shaft of the motor drives the fan blades and the air compression assembly to operate simultaneously.

[0015] Preferably, two ends of the motor are each connected to a connecting sleeve, and the connecting sleeve is correspondingly connected to one of the boxes.

[0016] Preferably, the air compression component is a cylinder component or a scroll component.

[0017] Preferably, a silencer filter portion is provided in the filter cavity, and the silencer filter portion includes a filter element and a silencer device.

[0018] Preferably, the silencing device is a silencing pipe or a silencing channel.

[0019] Preferably, the connecting sleeve and the motor housing are integrally formed or the connecting sleeve and the blocking portion are detachably connected.

[0020] Preferably, the blocking portion semi-encloses and shields the coil of the motor.

[0021] Preferably, there are two or more compression components; and there are two or more boxes.

[0022] As described above, the air compressor disclosed in the present invention has the following beneficial effects:

[0023] The present invention forms an airflow from the motor to the compression component by rotating the fan blades. According to Bernoulli's principle, the faster the fluid flow rate, the lower the pressure. The coil and the motor end form a negative pressure space, and the external air is sucked into the outer cavity through the connecting sleeve. The hot air generated between the enameled wires of the motor end coil and the blind corner is sucked into the outer cavity through the heat dissipation channel, so that the air forms convection at the motor coil to perform heat exchange. A part of the positive pressure air blown to the box through the fan blade enters the inner cavity along the outer cavity to provide a compressed air source for the air compression component, and the other part is discharged through the outer cavity opening along the vent on the air compression component to dissipate heat for the cylinder or vortex of the air compression component. The present invention can effectively dissipate heat to the motor end coil and the blind corner, and at the same time dissipate heat to the box and the air compression component to reduce the temperature rise of the compressor.

[0024] The present invention arranges the air compression component in the inner cavity to form a closed space, so that external dust is not easy to enter the cylinder or the scroll, and inputs positive pressure airflow to the air compression component in the inner cavity through the boost chamber, thereby ensuring sufficient gas supply to the air compression component. In particular, when the air compressor is used in plateau areas with thin air, it can effectively ensure that the air compression component can output compressed gas normally.

[0025] The present invention shields the motor end coil by the connecting sleeve, which can fully prevent foreign objects from entering the coil, thereby avoiding overload and short circuit of the motor caused by the entry of foreign objects such as metal particles.

[0026] The present invention further arranges a spiral leaf-shaped guide plate in the connecting sleeve to form a cyclone-like airflow between the connecting sleeve and the fan blades, further expanding the negative pressure space between the connecting sleeve and the fan blades, and effectively reducing the pressure of the negative pressure space. The centrifugal effect generated further prevents debris from entering the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional schematic diagram of an air compressor provided in one embodiment of the present invention.

[0028] Figure 2 A top view of an air compressor provided in accordance with an embodiment of the present invention.

[0029] Figure 3 for Figure 2 AA section view.

[0030] Figure 4 for Figure 2 BB cross-sectional view.

[0031] Figure 5 for Figure 4 CC cross-sectional view.

[0032] Figure 6 A three-dimensional schematic diagram of a connecting sleeve provided in one embodiment of the present invention.

[0033] Figure 7 An exploded schematic diagram of an air compressor provided in one embodiment of the present invention.

[0034] Figure 8 A three-dimensional schematic diagram of a connecting sleeve provided in a second embodiment of the present invention.

[0035] Fig. 9 This is a left side view of the connecting sleeve provided in the second embodiment of the present invention.

[0036] Fig.10 A right side view of a connecting sleeve provided in accordance with a second embodiment of the present invention.

[0037] Fig.11 A three-dimensional schematic diagram of a connecting sleeve provided in a third embodiment of the present invention.

[0038] Fig.12 An exploded schematic diagram of an air compressor provided in the third embodiment of the present invention.

[0039] Fig.13 A schematic diagram of the assembly of a silencer channel provided in the third embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 1. Motor; 2. Connecting sleeve; 21. Heat dissipation channel; 22. First protective cover; 220. Ventilation hole; 23. Blocking part; 26. Guide plate; 27. Shielding plate; 3. Box body; 31. Pressurization chamber; 32. Filter chamber; 33. Inner cavity; 34. Outer cavity; 35. Fan blade; 4. End cover; 41. Outer end cover; 42. Inner end cover; 43. Front cover; 44. Rear cover; 5. Air compression assembly; 51. Ventilation port; 52. Cylinder sleeve; 53. Valve plate; 54. Cylinder head; 55. Piston assembly; 7. Silencer filter part; 71. Filter element; 72. Silencer pipe; 73. Silencer chamber; 731. First air inlet; 74. Silencer channel; 741. Guide plate; 75. Filter chamber; 76. One-way valve. DETAILED DESCRIPTION

[0042] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0043] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0044] Embodiment 1

[0045] like Figure 1-Figure 7 As shown, an embodiment of an air compressor includes a motor 1, at least one connecting sleeve 2, a box body 3, an end cover 4 and an air compression assembly 5. A blocking portion 23 is provided in the connecting sleeve 2. The blocking portion 23 is sleeved on the end of the motor to partially shield the coil. A heat dissipation channel 21 is formed on the blocking portion 23. The connecting sleeve 2 is connected to the box body 3 at one end away from the heat dissipation channel 21 to form a boost chamber 31. The box body 3 is connected to the end cover 4 at one side away from the connecting sleeve 2 to form a filter chamber 32 and an inner cavity 33 for providing compressed gas ( Figure 3-5 The boost chamber 31 is connected to the filter chamber 32 to form an external cavity 34 for heat dissipation ( Figure 3-5The inner cavity 33 is connected with the outer cavity 34, that is, the airflow enters the inner cavity 33 through the heat dissipation channel 21, the boost cavity 31 and the filter cavity 32 in sequence; the motor shaft extends along the boost cavity 31 to the inner cavity 33, and a fan blade 35 is provided on the motor shaft located in the boost cavity 31. The fan blade 35 is located in the connecting sleeve 2 or the box body 3, and the connecting sleeve 2 connects the outside and the outer cavity 34. The fan blade 35 rotates in the area between the connecting sleeve 2 and the fan blade 35 to form a negative pressure space (i.e., a space lower than the outside atmospheric pressure), so that the external air and the hot air generated inside the motor are sucked into the outer cavity 34 including the boost cavity 31 to form positive pressure air. A part of the positive pressure air enters the inner cavity 33 to supply air to the air compression component 5; the air compression component 5 is installed in the inner cavity 33 and connected to the motor shaft. The air compression component 5 and the inner cavity 33 form a closed space, and the inner cavity 33 is provided with a compressed air inlet. The motor 1 drives the piston in the air compression component to reciprocate, and the air entering the inner cavity 33 from the outer cavity 34 is pressurized through the air compression component 5 and outputted unidirectionally along the compressed air inlet, and the compressed gas is discharged along the compressed gas outlet. Another part of the positive pressure air passes through the outer periphery of the air compression component 5 along the outer cavity 34 and is discharged through the vent 51 opened on the top of the air compression component 5 or discharged from between the valve plate 53 and the cylinder head 54. Since the air compression component 5 generates a lot of heat when compressing the gas, the positive pressure gas in the outer cavity 34 can dissipate heat for the air compression component 5.

[0046] In one embodiment, the blocking portion 23 is annular, half-surrounding and shielding the coil of the motor 1, the inner diameter of the blocking portion 23 is larger than the inner diameter of the coil of the motor 1, and the outer diameter of the blocking portion 23 is larger than the outer diameter of the coil of the motor 1. In another embodiment, the blocking portion 23 is a disc structure, and one or more holes are provided near the center as a heat dissipation channel 21. Specifically, the heat dissipation channel 21 can be a single hole channel with a circular or elliptical cross section, or a mesh-like porous channel.

[0047] Specifically, the fan blade 35 is preferably an axial fan blade, the heat dissipation channel 21 of the connecting sleeve 2 is opened along the axial direction, and the coil is located in the heat dissipation channel 21. When in use, the fan blade 35 is driven to rotate by the motor 1, generating an airflow blowing toward the air compression component 5, so that negative pressure is generated in the heat dissipation channel 21. According to the Bernoulli principle, the external air enters the external cavity 34 through the connecting sleeve 2, and at the same time forms a negative pressure space at the external coil of the motor, so that the heat between the enameled wires of the coil and in the blind area (the blind area dead corner that cannot be reached by positive blowing) is siphoned to the external cavity 34, prompting the air to form convection at the motor coil part (that is, the air enters from the connecting sleeve 2 at the motor coil, and the air is sucked in at the end face or the middle of the coil, thereby realizing heat exchange). The heat dissipation of the coil and the motor was tested under the same conditions. Compared with the positive pressure cooling, the negative pressure cooling method can reduce the motor temperature by 10 degrees; at the same time, compared with the fully enclosed coil, the structure of the blocking part 23 that semi-encloses and shields the coil of the motor 1 can reduce the coil temperature rise by more than 30 degrees. It should be emphasized that the blocking part 23 where the heat dissipation channel 21 of the connecting sleeve 2 is located is arranged at the motor end to partially block the coil. At this time, the blocking part 23 is in a state of blocking the motor coil to prevent particulate matter from being sucked into the coil with the external air, especially metal particles, to reduce the risk of motor short circuit and wear.

[0048] Furthermore, the air in the outer cavity 34 is rotated by the fan blades 35 to form positive pressure air that blows toward the inner wall of the box body 3 and the end cover wall for heat dissipation. A part of the positive pressure air flows along the outer cavity 34 to the entrance of the inner cavity 33 at the end cover 4, and the positive pressure air enters the closed inner cavity 33. In one specific embodiment, the air compression component 5 is preferably a cylinder component, and the motor 1 drives the piston in the cylinder component to reciprocate up and down. A one-way valve is provided on the cylinder component. Under the action of the piston, the positive pressure air in the inner cavity 33 is pressurized and opened and closed by the one-way valve to output in one direction, thereby realizing the output of compressed gas. Another part of the positive pressure air flows upward along the outer wall of the inner cavity in the outer cavity 34 until it flows out from the vent 51, so as to ensure that the positive pressure air can fully dissipate the heat of the cylinder component. In another specific embodiment, the air compression component 5 is preferably a vortex component, which is composed of a movable vortex and a static vortex, and the motor 1 drives the movable vortex to move to compress the gas.

[0049] In one embodiment, if Figure 4-Figure 6As shown, the connecting sleeve 2 also includes a first protective cover 22, one end of which is connected to the housing of the motor 1, and the other end of the protective cover 22 is connected to the box 3; a plurality of ventilation holes 220 are provided on the first protective cover 22 to prevent large particles of debris from entering the interior of the coil; the blocking portion 23 is arranged in the first protective cover 22 as an integral arrangement, and a ventilation channel is formed between the blocking portion 23 and the first protective cover 22; the blocking portion 23 is provided with a heat dissipation channel 21 along the axial direction, and the blocking portion 23 is sleeved on the periphery of the coil in a semi-enclosed state to wrap the coil. The connecting sleeve 2 is manufactured and assembled separately from the housing of the motor 1 or integrally formed, and the blocking portion 23 is manufactured and assembled separately from the connecting sleeve or integrally formed.

[0050] In one embodiment, the blocking portion 23 and the first protective cover 22 are integrally formed. In another embodiment, the blocking portion 23 is detachably connected to the first protective cover 22.

[0051] During use, the first protective cover 22 is sleeved on the motor end, and the blocking part 23 is sleeved on the periphery of the coil. There is a certain spacing between the coil and the blocking part 23, so that the blocking part 23 is in a semi-closed state as a whole. Due to the particles of different diameters contained in the external air, when the motor shaft drives the fan blade 35 to rotate, the first protective cover 22 and the fan blade 35 are easily formed with a negative pressure space, and the external air is sucked into the outer cavity along the ventilation duct. At this time, the grille of the ventilation hole 220 can block the large particles to the outside of the protective cover, so that the fine dust and the particles enter the protective cover 22, and avoid damage to the motor. At the same time, the blocking part 23 is arranged at the periphery of the coil in a semi-closed state and wraps the coil, preventing the fine dust entering the first protective cover 22 from entering the coil, especially the fine metal particles. While preventing the particles from entering the coil, the hot air between the enameled wires in the coil under the effect of the fan blade 35 will be sucked into the outer cavity 34 along the heat dissipation channel 21, which can effectively cool the motor.

[0052] In one embodiment, if Figure 6 As shown, the ventilation holes 220 are arranged circumferentially around the side wall of the first protective cover 22, and the ventilation holes 220 are biased toward the outer side of the position of the fan blade 35, or a plurality of ventilation holes 220 are opened on the bottom wall of the first protective cover 22 and open along the axial direction, and the ventilation holes 220 are arranged circumferentially around the axis of the first protective cover 22. The ventilation holes 220 are strip grilles.

[0053] When in use, under the action of the fan blades 35, the air around the first protective cover 22 enters the outer cavity 34 along the ventilation holes 220, and at the same time can block a large number of large particles of debris.

[0054] In one embodiment, if Figure 4As shown, the end cover 4 includes an outer end cover 41 and an inner end cover 42. The outer end cover 41 is connected to the box body 3 to form an outer cavity 34. The inner end cover 42 is connected to the box body 3 to form an inner cavity 33. A filter cavity 32 is formed between the outer end cover 41 and the inner end cover 42. The side wall of the filter cavity 32 is provided with a plurality of openings in the circumferential direction so that positive pressure air can enter the filter cavity 32. A silencer filter 7 is provided in the filter cavity 32. The silencer filter 7 is connected to the entrance of the inner cavity 33. Specifically, the silencer filter 7 uses a HEPA filter to achieve gas filtering and silence. The particulate matter sucked in by the fan blades 35 will eventually be filtered and adsorbed in the silencer filter 7.

[0055] Specifically, the outer end cover 41 and the inner end cover 42 are arranged in layers inside and outside along the axial direction. The inner end cover 42 is connected to the housing 3, and a sealing ring is provided at the connection. At the same time, it forms an axially closed inner cavity 33 with the bearing plugged into the wall of the housing 3. It should be noted that the housing 1 is a fully enclosed structure, and the air flow enters through the ventilation hole 220 and is discharged through the ventilation port 51 or the compressed gas outlet. The positive pressure air in the filter cavity 32 enters the inner cavity 33 through the silencer filter 7. On the one hand, it satisfies the air supply for the inner cavity 33, and can also reduce the heat generated when the air compression component 5 moves; on the other hand, it ensures that clean air enters the inner cavity 33. At the same time, the positive pressure air entering the inner cavity 33 ensures the air intake of the air compression component 5, especially when the air compressor is used in plateau areas with thin air, it can effectively ensure the normal compressed gas output of the air compression component 5.

[0056] In one embodiment, if Figure 4 As shown, the silencer filter portion 7 includes a filter element 71 and at least one silencer pipe 72. The filter element 71 and the bottom wall of the inner end cover 42 form a silencer chamber 73. The silencer chamber 73 is provided with at least one first air inlet 731 connected to the inner cavity 33. The silencer pipe 72 is arranged in the silencer chamber 73, and the silencer pipe 72 is connected to the first air inlet 731.

[0057] Reference Figure 4-5 When in use, external air is sucked into the boost chamber 31 through the fan blades 35 to form positive pressure air, and the positive pressure air enters the filter chamber 32 along the boost chamber 31. The positive pressure air in the filter chamber 32 first enters the muffler chamber 73 through the filter element 71, which can filter the dust and debris in the external cavity, so that the clean air enters the inner cavity 33 along the muffler pipe 72 and the first air inlet 731 in turn, while reducing the heat generated when the air compression component 5 moves. The red arrow in the figure represents the direction of air flow. The filter screen of the filter element 71 is under positive pressure, which pressurizes the air entering the inner cavity 33 and helps the air compressor to intake air, which is suitable for plateau areas with thin air.

[0058] In one embodiment, if Figure 4 and Figure 7As shown, the cylinder assembly includes a cylinder sleeve 52, a valve plate 53 and a cylinder cover 54. The cylinder sleeve 52 is arranged at the outlet of the inner cavity, and the cylinder sleeve 52 abuts against the inner wall of the inner cavity 33. A piston assembly 55 is installed in the cylinder sleeve 52; the piston assembly 55 is connected to the motor shaft in the inner cavity 33; the valve plate 53 is installed on the top of the cylinder sleeve 52, the valve plate 53 abuts against the outlet of the outer cavity, and the cylinder cover 54 is installed on the valve plate 53, and at least one vent 51 is opened on the periphery of the valve plate 53 and the cylinder cover 54.

[0059] Specifically, the piston assembly 55 includes a connecting rod, a crank and a pressure plate. The pressure plate is arranged on the connecting rod, and a one-way valve plate is arranged on the pressure plate. The connecting rod is arranged at the end of the motor shaft located in the inner cavity 33. The crank is installed on the connecting rod and connected to the motor shaft, so that the motor shaft can drive the crank to rotate and then drive the connecting rod to reciprocate up and down. The connecting rod drives the pressure plate to reciprocate up and down in the cylinder sleeve 52. A valve hole is arranged on the pressure plate, and a one-way valve plate is arranged on the valve hole. When the connecting rod reciprocates up and down, the one-way valve opens and closes, driving the air in the inner cavity 33 to enter the cylinder sleeve 52 through the pressure plate, so as to facilitate the output of pressurized gas.

[0060] In addition, it should be noted that the vent 51 can also be formed by a plurality of cylinder covers 54 , and a plurality of cylinder sleeves 52 can also be wrapped in the outer cavity 34 , so as to realize the setting of multiple or one vent 51 .

[0061] In one embodiment, if Figure 3-4 As shown, the outer cavity 34 surrounds the inner cavity 33. When in use, a portion of the positive pressure air in the outer cavity 34 flows through the boost cavity 31 and the filter cavity 32 in the axial direction, and then enters the inner cavity 33 from the first air inlet 731 in the filter cavity 32. This method increases the flow distance of the positive pressure air, and can effectively dissipate the heat from the inner wall of the box body and the inner wall of the end cover. At the same time, it pressurizes the air entering the inner cavity 33 to assist the air intake of the air compressor. Another part of the positive pressure air in the outer cavity 34 flows upward along the outer side wall of the inner cavity 33, and the positive pressure air flows through the valve plate 53 and the cylinder head 54 in turn until it is discharged. This method can fully dissipate the heat from the piston assembly, the valve plate 53 and the cylinder head 54. The red arrow in the figure represents the direction of airflow.

[0062] In one embodiment, the flow area in the outer cavity 34 is in a uniform elliptical ring shape, and the air flow can fully take away the heat in the outer cavity 34 to achieve effective heat dissipation.

[0063] In a further embodiment, the air compressor is specifically a single-sided single-cylinder air compressor, a single-sided double-cylinder V-shaped air compressor, a single-sided single-scroll air compressor, a double-sided single-cylinder air compressor, a double-sided double-cylinder V-shaped air compressor, a double-sided single-scroll air compressor, a double-sided three-cylinder W-shaped air compressor and other types of air compressors.

[0064] Embodiment 2

[0065] The second embodiment is substantially the same as the first embodiment, except that: Figure 8-Figure 10 As shown, a plurality of ventilation holes 220 are provided on the bottom wall of the first protective cover 22 in the radial direction of the connecting sleeve 2, so that the airflow entering direction is parallel to the motor shaft direction, which can reduce the kinetic energy loss of the airflow and reduce the probability of impurities falling onto the air compressor from directly above being sucked into the air compressor. The ventilation holes 220 are arranged circumferentially around the axis of the first protective cover 22; a plurality of guide plates 26 are arranged circumferentially in the ventilation duct, one end of the guide plate 26 is in contact with the inner bottom wall of the first protective cover 22, and the other end of the guide plate 26 is open, and the guide plate 26 and the second air outlet 220 are arranged opposite to each other.

[0066] Specifically, the guide plate 26 is arranged in a spiral leaf shape, and the side walls of the guide plate 26 are both attached to the inner wall of the first protective cover 22 and the outer wall of the blocking portion 23. When in use, under the action of the fan blades 35, when the external air enters the ventilation channel from the ventilation hole 220, the guide plate 26 can guide the air entering along the axial direction, and promote the air in the ventilation channel to enter the outer cavity 34 along the tangential direction obliquely forward of the open position. A cyclone-shaped airflow is formed between the connecting sleeve 2 and the fan blade 35. According to the cyclone effect, the flow rate of the cyclone-shaped airflow will be faster than that of the laminar airflow. According to the Bernoulli principle, the faster the airflow rate, the lower the pressure. The negative pressure space between the connecting sleeve 2 and the fan blade 35 can be expanded, and the pressure of the negative pressure space can be effectively reduced. The hot air between the enameled wires of the motor coil in the blocking portion 23 and the blind area can be more effectively sucked out to achieve the purpose of heat dissipation for the motor. At the same time, the centrifugal effect brought by the cyclone-shaped airflow will make the inhaled debris, especially metal debris, move toward the filter chamber 32 close to the inner wall of the box body 3, further reducing the probability of particle debris entering the motor and hitting the motor coil. It should be noted that the guide plate has a spiral direction and can be installed clockwise or counterclockwise during installation, but the spiral direction and the outlet direction must be consistent with the rotation direction of the fan blade 35, that is, it can generate a cyclone-shaped centrifugal airflow in the same direction as the rotation direction of the fan blade 35.

[0067] Embodiment 3

[0068] This embodiment is further improved on the basis of implementation 1. Figure 11-12As shown, the connecting sleeve 2 includes a first protective cover 22 and a blocking portion 23. The first protective cover 22 is sleeved on the motor 1, and the two ends are connected to the box body 3, so that the motor 1 is wrapped in the first protective cover 22 as a whole. The first protective cover 22 and the blocking portion 23 are separately arranged. The blocking portion 23 is sleeved on the two ends of the motor stator and can be detachably connected to the first protective cover 22, partially wrapping the coil in a semi-closed state to prevent external particles and debris from entering the coil. The first protective cover 22 is provided with a plurality of ventilation holes 220 on the outer wall near the motor 1 and the coil position. The ventilation holes 220 are arranged circumferentially, and the opening direction is radially opened along the first protective cover 22. External air enters the first protective cover 22 along the ventilation holes 220, providing an air source for the positive pressure air formed by the outer cavity 34 including the boost chamber 31, and dissipating heat from the motor body at the same time. The top and bottom of the first protective cover 22 are both closed, and shielding plates 27 are provided at the top and bottom of both ends of the first protective cover 22. The shielding plates 27 cover the ventilation holes 220 at the top and bottom, allowing external air to enter the first protective cover 22 in a horizontal direction, preventing external air from directly entering the first protective cover 22 in a vertical direction from the top and bottom, thereby greatly reducing the large particles in the air from entering the interior of the coil.

[0069] Furthermore, if Fig.11 As shown, the fan blade 35 is preferably a double-layered fan blade, wherein the inner blade of the double-layered fan blade is close to the heat dissipation channel 21. When the motor drives the fan blade 35 to rotate, the inner and outer blades of the double-layered fan blade rotate synchronously, and a negative pressure space with a larger pressure difference can be formed between the connecting sleeve 2 and the fan blade 35, thereby increasing the air intake. At this time, the hot air generated inside the motor is fully discharged along the heat dissipation channel 21, so that the inside of the motor is fully cooled, thereby improving the heat dissipation efficiency.

[0070] Furthermore, if Fig.12 As shown, the end cover 4 includes a front cover 43 and a rear cover 44. One end of the front cover 43 is connected to the box body 3 to form an inner cavity 33, and the other end of the front cover 43 is connected to the rear cover 44 to form a filter cavity 32. The front cover 43 and the rear cover 44 are arranged in layers inside and outside along the axial direction, and a sealing ring is provided at the connection between the front cover 43 and the box body 3.

[0071] Furthermore, if Fig.13As shown, the muffler filter 7 includes a filter element 71 and a muffler channel 74. The filter element is arranged at the top of the filter cavity 32 to form a filter chamber 75, which is used to filter fine particles in the positive pressure air. The air inlet end of the muffler channel 74 is connected to the filter chamber 75, so that the positive pressure air enters the filter element 71 and then enters the muffler channel 74 along the filter chamber 75 for mufflement. The air outlet end of the muffler channel 74 is connected to the inner cavity 33, wherein a one-way valve 76 is also provided at the connection between the air outlet of the muffler channel 74 and the inner cavity 33. When in use, the positive pressure air enters the muffler channel 74 along the filter chamber 75. After the air flow is muffled through the muffler channel 74, when the compression assembly 5 moves upward, negative pressure appears in the inner cavity 33, prompting the one-way valve 76 to open, thereby allowing the positive pressure air flow after mufflement to enter the inner cavity 33 to prevent gas backflow.

[0072] Furthermore, a plurality of guide plates 741 for unidirectionally conducting gas are provided in the muffler channel 74. The guide plates 741 are distributed on the inner side walls on both sides of the muffler channel 74, and are used to guide the airflow to flow smoothly, effectively reduce eddies and turbulence in the airflow, thereby reducing noise and improving the stability of the airflow. It should be noted that the guide plates 741 are preferably, but not limited to, streamlined plates, and may also be curved plates, bifurcated plates, or muffler pipes.

[0073] Furthermore, the silencer channel 74 is preferably but not limited to an L-shaped configuration, and a spiral channel or a zigzag channel may also be selected to increase the airflow path, thereby achieving a silencer effect.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An air compressor, comprising a motor (1), at least one connecting sleeve (2), a housing (3) and an air compression component (5), wherein the housing (3) is provided with the air compression component (5); characterized in that: The connecting sleeve (2) comprises a blocking portion (23), the blocking portion (23) being arranged around the axis of the motor (1), the blocking portion (23) semi-enclosing and shielding the coil of the motor (1); the blocking portion (23) having a heat dissipation channel (21), a fan blade (35) being arranged in the box (3) or the connecting sleeve (2), and a negative pressure space being formed at the heat dissipation channel (21) when the fan blade (35) rotates, thereby dissipating heat from the coil of the motor (1); the box (3) having an inner cavity (33) and an outer cavity (34) structure; The outer cavity (34) is connected to the heat dissipation channel (21); the air compression component (5) is installed on the inner cavity (33); the inner cavity (33) is connected to the outer cavity (34); the air compression component (5) and the inner cavity (33) form a closed space; the outer cavity (34) specifically includes a boost chamber (31) and a filter chamber (32); the boost chamber (31) is connected to the filter chamber (32); the airflow passes through the heat dissipation channel (21), the boost chamber (31) and the filter chamber (32) in sequence and enters the inner cavity (33); The outer wall of the connecting sleeve (2) is provided with a ventilation hole (220) for air intake.

2. The air compressor according to claim 1, characterized in that: The fan blade (35) is installed in the boost chamber (31).

3. The air compressor according to claim 1, characterized in that: The external cavity (34) extends onto the air compression component (5), and the gas flowing through the external cavity (34) dissipates heat for the air compression component (5).

4. The air compressor according to claim 1, characterized in that: The connecting sleeve (2) is integrally formed with the housing of the motor, or the connecting sleeve (2) is detachably connected to the blocking portion (23).

5. The air compressor according to claim 1, characterized in that: A guide plate (26) is arranged inside the connecting sleeve (2), and the guide plate (26) is arranged in a spiral leaf shape. The guide plate (26) can form a cyclone-shaped airflow between the connecting sleeve (2) and the fan blade (35).

6. The air compressor according to claim 1, characterized in that: There are more than two compression components (5).

7. The air compressor according to claim 1, characterized in that: There are more than two boxes (3).

8. The air compressor according to any one of claims 1 to 7, characterized in that: The air compression component (5) is a cylinder component or a scroll component.

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