Air compressor with improved waterproof level

Abstract

The present invention relates to the field of air compressors, and in particular to an air compressor with improved waterproof level. The air compressor with improved waterproof level includes a driving motor, a motor bracket, a crankcase, a capacitor, a capacitor baffle and an air guide cover; the two ends of the driving motor housing are respectively connected to the inner side of the crankcase and the inner side of the motor bracket, and the output end of the driving motor is connected to a cooling fan; the bottom surface screw of the capacitor passes through the corresponding hole position of the capacitor baffle and is connected to the protrusion of the crankcase body, and the capacitor baffle is clamped and fixed by the bottom surface of the capacitor and the protrusion surface of the crankcase body; the air guide cover covers the outside of all parts; the air compressor prevents rainwater from penetrating into the crankcase along the edge of the crankcase body by setting a waterproof step; and prevents rainwater sucked into the air compressor from dripping onto the surface of the capacitor by setting a shielding upper cover and a shielding rear cover, thereby improving the waterproof performance of the air compressor.

Description

Technical Field

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

[0002] The air compressor is the main body of the air source device. It is a device that converts the mechanical energy of the prime mover into gas pressure energy and is a gas pressure generating device for compressed air. The structure of an air compressor is similar to that of a water pump. Most air compressors are reciprocating piston type, with rotating blades or rotating screws. When working, the piston air compressor relies on the cylinder and the piston that reciprocates in the cylinder to change its internal volume. After the motor is started, it drives the crankshaft to rotate. Through the transmission of the connecting rod, the piston reciprocates and the working volume will change periodically. The crankshaft rotates one circle, the piston reciprocates once, and the process of intake, compression, and exhaust is realized in the cylinder one by one, that is, a working cycle is completed.

[0003] The Chinese utility model patent application (publication number CN208089488U, publication date: 20181113) discloses a piston air compressor, including a cylinder housing and a piston body, the bottom end of the piston body is connected to a transmission crankshaft, a cylinder head is arranged on the cylinder housing, a partition is arranged in the cylinder head, the partition divides the inside of the cylinder head into an air inlet cavity and an air outlet cavity, the side walls of the air inlet cavity and the air outlet cavity are respectively provided with an air inlet and an air outlet, a connecting plate is arranged between the cylinder head and the cylinder housing, an air inlet opening and an air outlet opening are opened on the connecting plate, an air inlet valve plate is arranged on the lower end surface of the connecting plate, a limiting step for limiting the displacement of the air inlet valve plate is arranged in the cylinder housing, a reset spring for the air inlet valve plate to abut is arranged on the limiting step, an air outlet valve plate is arranged on the upper end surface of the connecting plate, and the air outlet valve plate covers the top of the air outlet opening. The utility model has the advantages of good sealing and stable output performance.

[0004] The existing technology has the following deficiencies: 1. There is a gap between the end face of the capacitor baffle and the edge of the crankcase body, and rainwater can flow directly into the gap and penetrate into the crankcase along the edge of the crankcase body; at the same time, the capacitor baffle only blocks part of the capacitor but not the entire capacitor; when the air compressor starts and drives the fan blades to rotate, rainwater will be sucked into the machine cavity by the suction of the air inlet and will be thrown to the upper layer of the air guide cover due to centrifugal force; when the rainwater on the upper layer of the air guide cover accumulates to a certain amount, it will drip onto the unblocked part of the capacitor and then invade the inside of the capacitor, causing damage to the capacitor. 2. The ends of some guide ribs between the cylinder boss and the crankcase body in the crankcase are in contact with the motor boss of the crankcase. When the crankcase is tilted, the inclined guide ribs will guide the water flow to the motor boss and then enter the motor along the motor boss. When the air compressor is tested for IP32, some water droplets will flow in along the edge of the crankcase; however, there is no drainage groove on the edge of the crankcase, and the water droplets flowing into the edge of the crankcase will wet the drive motor along the motor boss due to the lack of drainage grooves to guide them. There is a gap at the joint between the edge of the crankcase and the air guide cover. When the air compressor is tested for IP32, the feeler can extend into the air compressor along the gap between the edge of the crankcase and the air guide cover, and even contact the charged body inside the air compressor, increasing the safety hazard of the air compressor. 3. The bracket rib plate of the motor bracket is a hollow structure and does not block the rear output line of the drive motor; when the air compressor is started, the fan blades rotate to suck rainwater into the machine cavity, and due to centrifugal force, the rainwater will be thrown to the upper layer of the air guide cover. When the rainwater at the upper end drips onto the unblocked rear output line of the drive motor, it will cause a short circuit. 4. The vents of the air duct are through holes that connect the inside of the air compressor with the outside. Rainwater can drip directly into the air compressor along the vents and contact the charged parts inside the air compressor. The air inlet slot of the air duct is wide. When the air compressor is tested for IP32, the probe finger can pass through the air inlet slot and directly enter the air compressor, which does not meet the IP32 test requirements. Summary of the invention

[0005] The purpose of the present invention is: to address the above-mentioned problem 1, to propose an air compressor with an improved waterproof grade by setting a waterproof step to prevent rainwater from penetrating into the crankcase along the edge of the crankcase body; to prevent rainwater sucked into the air compressor from dripping onto the surface of the capacitor by setting a shielding upper cover and a shielding rear cover, thereby improving the waterproof performance of the air compressor.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] An air compressor with improved waterproof grade, the air compressor comprises a driving motor, a motor bracket, a crankcase, a capacitor, a capacitor baffle and an air guide cover; the two ends of the driving motor housing are respectively connected to the inner side surface of the crankcase and the inner side surface of the motor bracket, and the output end of the driving motor is connected to the cooling fan; the screw on the bottom surface of the capacitor passes through the corresponding hole position of the capacitor baffle and is connected to the protrusion of the crankcase body, and the capacitor baffle is clamped and fixed by the bottom surface of the capacitor and the protruding surface of the crankcase body; the air guide cover covers the outside of all parts; the capacitor baffle comprises a heat dissipation part and a capacitor shielding part; the heat dissipation part comprises a waterproof step; the waterproof step protrudes from the end surface of the heat dissipation part, and the waterproof step shields the gap between the edge of the crankcase body and the end surface of the heat dissipation part; the capacitor shielding part comprises a shielding upper cover and a shielding back cover; the heat dissipation part located at the front end, the shielding upper cover located at the upper end and the shielding back cover located at the rear end are connected to form a cavity opening downward, and the capacitor is wrapped inside the open cavity as a whole.

[0008] Preferably, the shielding upper cover includes an upper cover and a side cover; the upper cover is located above the capacitor, and the multiple side covers are respectively located on both sides of the capacitor, and the bottom surface of the side cover is lower than the lowest position of the capacitor; the upper cover is in an arc shape.

[0009] Preferably, the capacitor baffle also includes a water flow guide portion; the upper end of the water flow guide portion is connected to the lower end of the side baffle cover, and the water flow guide portion is located outside the drive motor; the upper end of the water flow guide portion and the lower end of the side baffle cover are connected through an arc surface transition; the water flow guide portion includes a water flow guide groove; the upper and lower ends of the water flow guide groove are respectively connected to the head and tail ends of the water flow guide portion.

[0010] Preferably, the upper baffle cover, the side baffle cover and the water flow guide part all include baffle cover curling edges; the baffle cover curling edges are located at the edges of the upper baffle cover, the side baffle cover and the water flow guide part and protrude from the surfaces of the upper baffle cover, the side baffle cover and the water flow guide part.

[0011] Preferably, the crankcase includes a case body, a cylinder boss, guide ribs, a cover shell fitting surface and a motor boss; the cylinder boss protrudes from the top of the case body, the cylinder boss is connected to the upper surface of the case body by a plurality of guide ribs, and the ends of the guide ribs do not contact the motor boss; the cover shell fitting surface is located on the rear side of the case body, and the cover shell fitting surface is seamlessly connected to the front side of the air guide cover; the motor boss protrudes from the rear side of the case body and is connected to the drive motor housing, and a concave drainage groove is provided on the surface of the motor boss. The drainage groove is located at the intersection of the motor boss and the rear side of the case body; the upper initial end of the drainage groove is higher than the horizontal symmetry plane in the middle of the motor boss, and the lower end of the drainage groove is lower than the horizontal symmetry plane in the middle of the motor boss.

[0012] Preferably, the motor bracket includes a bracket bottom plate, a bracket rib plate and a bracket baffle plate; the bracket bottom plate is connected to the rear end of the drive motor housing; the bracket rib plate is fixed to the bracket bottom plate, and the rear output end of the drive motor passes through the bracket bottom plate and the center hole of the bracket rib plate to connect with the cooling fan; the bracket baffle plate protrudes from the front surface of the bracket bottom plate, and the bracket baffle plate covers the circuit of the rear output end of the drive motor; the bracket baffle plate is an arc-shaped baffle plate, and the arc of the bracket baffle plate fits the outermost arc of the bracket bottom plate; the bracket baffle plate is symmetrically distributed along the rear output shaft of the drive motor. The bracket baffle plate includes baffle plate reinforcement ribs; the baffle plate reinforcement ribs protrude from the front edge of the bracket baffle plate.

[0013] Preferably, the air guide cover includes ventilation holes; a plurality of ventilation holes are located above the air guide cover, and the ventilation holes are filled with fillers. The air guide cover also includes an air inlet slot; the air inlet slot is located on the side of the air guide cover, and the width of the air inlet slot meets the IP32 test requirements.

[0014] The advantages of the air compressor with improved waterproof level using the above technical solution of the present invention are:

[0015] 1. By setting waterproof steps and capacitor shielding parts; when water flows in along the gap between the edge of the crankcase body and the end face of the heat dissipation part, the waterproof steps protruding from the gap will block the water and discharge it to the outside of the crankcase to prevent water from penetrating into the crankcase. When the air compressor fan blades rotate and suck water droplets into the air compressor, the shielding upper cover and shielding rear cover wrapped around the outside of the capacitor will block the water droplets above and behind to prevent the water droplets from contacting the capacitor. The water flow guide located outside the crankcase drive motor reserves enough space for the air compressor to install the high-pressure pipe; and when the drive motor rotates in a larger space during the operation of the air compressor, the heat generated by the stator can be dissipated through the larger space; thereby cooling the stator during operation to prevent the motor from burning when the temperature is too high.

[0016] 2. By setting guide ribs, cover fitting surfaces and drainage grooves; when the air compressor is tilted, the end of the guide rib that is not in contact with the motor boss will not guide the water flow toward the edge of the case, preventing the water flow from entering the drive motor along the guide ribs; when the air compressor is tested for IP32, the touch finger will be blocked and cannot pass through when it is extended along the cover fitting surface and the connection position of the air guide cover, so that the touch finger cannot touch the charged body inside the air compressor; the water droplets flowing into the edge of the crankcase are guided by the drainage groove and gathered in the drainage groove and flow out of the air compressor without contacting the drive motor.

[0017] 3. By setting a bracket baffle, the air compressor starts and drives the fan blades to rotate to suck rainwater into the machine cavity. Due to the centrifugal force, the rainwater will be thrown to the upper layer of the air guide cover. When the rainwater on the upper end drips, it will be blocked by the bracket baffle and will not contact the rear output end circuit of the drive motor under the bracket baffle, thereby protecting the rear output end circuit of the drive motor.

[0018] 4. By setting ventilation holes and air inlet slots, when rain falls into the ventilation holes, it will be blocked by the fillers inside the ventilation holes and cannot enter the air compressor, thus preventing external rain from contacting the charged parts inside the air compressor. When performing IP32 test on the air compressor, the touch finger cannot directly enter the air compressor through the air inlet slot, thus preventing the touch finger from directly contacting the charged parts inside the air compressor, thus meeting the IP32 test requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 , Figure 2 It is the structural diagram of the air compressor.

[0020] Figure 3 Schematic diagram of the structure of the capacitor baffle.

[0021] Figure 4 It is a schematic diagram of the crankcase structure.

[0022] Figure 5 This is a schematic diagram of the structure of the motor bracket.

[0023] Figure 6 It is a structural schematic diagram of the air guide cover. DETAILED DESCRIPTION

[0024] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figure 1 , Figure 2 An air compressor with improved waterproof grade is shown, which includes a drive motor, a motor bracket 1, a crankcase 2, a capacitor, a capacitor baffle 3 and an air guide cover 4; the two ends of the drive motor housing are respectively connected to the inner side of the crankcase 2 and the inner side of the motor bracket 1, and the output end of the drive motor is connected to the cooling fan; the screw on the bottom surface of the capacitor passes through the corresponding hole position of the capacitor baffle 3 and is connected to the protrusion of the crankcase 2, and the capacitor baffle 3 is clamped and fixed by the bottom surface of the capacitor and the protruding surface of the crankcase 2; the air guide cover 4 covers the outside of all parts.

[0027] like Figure 3As shown, the capacitor baffle 3 includes a heat dissipation portion 31 and a capacitor shielding portion 32; the heat dissipation portion 31 includes a waterproof step 311; the waterproof step 311 protrudes from the end face of the heat dissipation portion 31, and the waterproof step 311 shields the gap between the edge of the crankcase 2 and the end face of the heat dissipation portion 31; when water flows in along the gap between the edge of the crankcase 2 and the end face of the heat dissipation portion 31, the waterproof step 3 protruding from the gap blocks the water and discharges it to the outside of the crankcase 2 to prevent water from penetrating into the inside of the crankcase 2; the capacitor shielding portion 32 includes a shielding upper cover 321 and a shielding rear cover 322; the heat dissipation portion 31 at the front end, the shielding upper cover 321 at the upper end, and the shielding rear cover 322 at the rear end are connected to form a cavity opening downward, and the capacitor as a whole is wrapped inside the open cavity. When the air compressor blades rotate and suck water droplets into the air compressor, the shielding upper cover 321 and the shielding rear cover 322 wrapped around the outside of the capacitor block the water droplets above and behind to prevent the water droplets from contacting the capacitor. The shielding upper cover 321 includes an upper cover 3211 and a side cover 3212; the upper cover 3211 is located above the capacitor, and multiple side covers 3212 are respectively located on both sides of the capacitor, and the bottom surface of the side cover 3212 is lower than the lowest position of the capacitor to shield the lower end of the capacitor; the upper cover 3211 is in an arc shape. The capacitor baffle 3 also includes a water flow guide 33; the upper end of the water flow guide 33 is connected to the lower end of the side baffle 3212, and the water flow guide 33 is located outside the drive motor; the water flow guide 33 located outside the drive motor of the crankcase 2 reserves enough space for the air compressor to install a high-pressure pipe; and when the drive motor rotates in a larger space during operation of the air compressor, the heat generated by the stator can be dissipated through the larger space; thereby cooling the stator during operation to prevent the motor from burning when the motor temperature is too high. The upper end of the water flow guide 33 is connected to the lower end of the side baffle 3212 through an arc surface transition; the water flow guide 33 includes a water flow guide groove 331; the upper and lower ends of the water flow guide groove 331 are connected to the head and tail ends of the water flow guide 33 respectively. The rainwater sucked in by the compressor blades when rotating and thrown to the upper layer of the wind guide 4 drops to the shielding cover 321, flows down along the upper cover 3211 and the side cover 3212 and gathers into the water flow guide groove 331, and the water flow guide groove 331 discharges the rainwater to prevent it from entering the crankcase 2 and contacting the internal circuit of the crankcase 2. The upper cover 3211, the side cover 3212 and the water flow guide 33 all include a cover curling edge 30; the cover curling edge 30 is located at the edges of the upper cover 3211, the side cover 3212 and the water flow guide 33 and protrudes from the surfaces of the upper cover 3211, the side cover 3212 and the water flow guide 33.

[0028] The capacitor baffle 3 solves the problem that there is a gap between the end face of the capacitor baffle and the edge of the crankcase body, and rainwater can flow directly into the gap and penetrate into the crankcase along the edge of the crankcase body; at the same time, the capacitor baffle only shields the capacitor part but not the entire capacitor; when the air compressor starts and drives the fan blades to rotate, the rainwater will be sucked into the machine cavity by the suction of the air inlet and will be thrown to the upper layer of the wind guide cover due to centrifugal force; when the rainwater on the upper layer of the wind guide cover accumulates to a certain amount, it will drip to the unshielded part of the capacitor and then invade the inside of the capacitor to cause damage to the capacitor. By setting a waterproof step 311 and a capacitor shielding part 32; when water flows in along the gap between the edge of the crankcase 2 and the end face of the heat dissipation part 31, the waterproof step 3 protruding from the gap blocks the water and discharges it to the outside of the crankcase 2 to prevent water from penetrating into the crankcase 2. When the compressor blades rotate and draw water droplets into the compressor, the shielding upper cover 321 and the shielding rear cover 322 wrapped around the capacitor block the water droplets above and behind to prevent the water droplets from contacting the capacitor. The water flow guide 33 located outside the crankcase 2 drive motor reserves enough space for the air compressor to install the high-pressure pipe; and when the air compressor drive motor rotates in a larger space during operation, the heat generated by the stator can be dissipated through the larger space; thereby cooling the stator during operation to prevent the motor from burning out when the motor temperature is too high.

[0029] like Figure 4 As shown, the crankcase 2 includes a case 21, a cylinder boss 22, a guide rib 23, a cover fitting surface 24 and a motor boss 25; the cylinder boss 22 protrudes above the case 21, and the cylinder boss 22 is connected to the upper surface of the case 21 through a plurality of guide ribs 23, and the ends of the guide ribs 23 do not contact the motor boss 25; when the air compressor is tilted, the ends of the guide ribs 23 that do not contact the motor boss 25 will not guide the water flow to the edge of the case 21, so as to prevent the water flow from flowing along the guide ribs 2 3 enters the interior of the drive motor; the cover fitting surface 24 is located on the rear side of the box body 21, and the cover fitting surface 24 is seamlessly connected to the front side of the air guide cover; when the IP32 test of the air compressor is performed, the touch finger will be blocked and cannot pass through when it extends along the connection position between the cover fitting surface 24 and the air guide cover, so that the touch finger cannot touch the charged body inside the air compressor; the motor boss 25 protrudes from the rear side of the box body 21 and is connected to the drive motor housing, and a concave drainage groove 26 is provided on the surface of the motor boss 25. The water drops flowing into the edge of the crankcase are guided by the drainage groove 26 and gathered in the drainage groove 26 and flow out of the air compressor without contacting the drive motor; the cover fitting surface 24 is filled with polytetrafluoroethylene or foamed silicone and is seamlessly connected to the front side of the air guide cover; the drainage groove 26 is located at the intersection of the motor boss 25 and the rear side of the box body 21; the upper initial end of the drainage groove 26 is higher than the horizontal symmetry plane in the middle of the motor boss 25, and the lower end end of the drainage groove 26 is lower than the horizontal symmetry plane in the middle of the motor boss 25.

[0030] Crankcase 2 solves the problem that the ends of some guide ribs between the cylinder boss and the crankcase body in the crankcase are in contact with the motor boss of the crankcase. When the crankcase is tilted, the inclined guide ribs will guide the water flow to the motor boss and then enter the motor along the motor boss. When the air compressor is tested for IP32, some water droplets will flow in along the edge of the crankcase; but there is no drainage groove on the edge of the crankcase, and the water droplets flowing into the edge of the crankcase will wet the drive motor along the motor boss due to the lack of drainage grooves. There is a gap at the junction of the edge of the crankcase and the air guide cover. When the air compressor is tested for IP32, the feeler can extend into the air compressor along the gap between the edge of the crankcase and the air guide cover and even contact the charged body inside the air compressor, increasing the safety hazard of the air compressor. By setting the guide rib 23, the cover fitting surface 24 and the drainage groove 26; when the air compressor is tilted, the end of the guide rib 23 that is not in contact with the motor boss 25 will not guide the water flow to the edge direction of the box body 21, so as to prevent the water flow from entering the driving motor along the guide rib 23; when the IP32 test of the air compressor is carried out, the touch finger will be blocked and cannot pass through when it is extended along the cover fitting surface 24 and the connection position of the air guide cover, so that the touch finger cannot touch the charged body inside the air compressor; the water droplets flowing into the edge of the crankcase are guided by the drainage groove 26 and gathered in the drainage groove 26 and flow out of the air compressor without contacting the driving motor.

[0031] like Figure 5 As shown, the motor bracket 1 includes a bracket base plate 11, a bracket rib plate 12 and a bracket baffle plate 13; the bracket base plate 11 is connected to the rear end of the drive motor housing; the bracket rib plate 12 is fixed on the bracket base plate 11, and the rear end output end of the drive motor passes through the bracket base plate 11 and the center hole of the bracket rib plate 12 to be connected to the cooling fan; the bracket baffle plate 13 protrudes from the front surface of the bracket base plate 11, and the bracket baffle plate 13 covers the upper part of the rear output end circuit of the drive motor; the air compressor starts and drives the fan blades to rotate to suck rainwater into the machine cavity, and due to the centrifugal force, the rainwater will be thrown to the upper layer of the air guide cover, and the rainwater at the upper end will be blocked by the bracket baffle plate 13 when dripping, and will not contact the rear output end circuit of the drive motor below the bracket baffle plate 13, thereby protecting the rear output end circuit of the drive motor; the bracket baffle plate 13 is an arc-shaped baffle, and the arc of the bracket baffle plate 13 fits the outermost arc of the bracket base plate 11; the bracket baffle plates 13 are symmetrically distributed along the rear output shaft of the drive motor. The support baffle 13 includes a baffle reinforcing rib 131, which protrudes from the front edge of the support baffle 13. Rainwater dripping onto the support baffle 13 will be guided by the baffle reinforcing rib 131 and flow down along the edge of the baffle reinforcing rib 131 to be discharged from the air compressor, further protecting the internal circuit of the drive motor.

[0032] The motor bracket 1 solves the problem that the bracket rib plate of the motor bracket is a hollow structure and does not block the rear output end line of the drive motor; the air compressor starts and drives the fan blades to rotate to suck rainwater into the machine cavity, and due to centrifugal force, the rainwater will be thrown to the upper layer of the wind guide cover, and the rainwater at the upper end will drip onto the unblocked rear output end line of the drive motor, causing a short circuit in the line. By setting a bracket baffle 13; the air compressor starts and drives the fan blades to rotate to suck rainwater into the machine cavity, and due to centrifugal force, the rainwater will be thrown to the upper layer of the wind guide cover, and the rainwater at the upper end will be blocked by the bracket baffle 13 when dripping, and will not contact the rear output end line of the drive motor below the bracket baffle 13, thereby protecting the rear output end line of the drive motor.

[0033] like Figure 6 As shown, the air guide cover 4 includes ventilation holes 41; a plurality of ventilation holes 41 are located above the air guide cover 4, and the ventilation holes 41 are filled with fillers. When rainwater falls on the ventilation holes 41, it will be blocked by the fillers inside the ventilation holes 41 and cannot enter the interior of the air compressor, thereby preventing external rainwater from contacting the charged parts inside the air compressor. The air guide cover 4 also includes an air inlet slot 42; the air inlet slot 42 is located on the side of the air guide cover 4, and the slot width of the air inlet slot 42 meets the IP32 test requirements. When the air compressor is subjected to the IP32 test, the feeler cannot pass through the air inlet slot to directly enter the interior of the air compressor, thereby preventing the feeler from directly contacting the charged parts inside the air compressor, thereby meeting the IP32 test requirements.

[0034] The air guide hood 4 solves the problem that the vents of the air guide hood are through holes that connect the inside of the air compressor with the outside; rainwater can drip directly into the air compressor along the vents and contact the charged parts inside the air compressor. The air inlet slot of the air guide hood is relatively wide, and when the air compressor is subjected to the IP32 test, the touch finger can pass through the air inlet slot and directly enter the inside of the air compressor, which does not meet the IP32 test requirements. By setting the ventilation holes 41 and the air inlet slots 42; when rainwater falls on the ventilation holes 41, it will be blocked by the filler inside the ventilation holes 41 and cannot enter the inside of the air compressor, thereby preventing external rainwater from contacting the charged parts inside the air compressor. When the air compressor is subjected to the IP32 test, the touch finger cannot pass through the air inlet slot and directly enter the inside of the air compressor, thereby preventing the touch finger from directly contacting the charged parts inside the air compressor, thereby meeting the IP32 test requirements.

Claims

1. An air compressor with improved waterproof level, characterized in that: The air compressor comprises a drive motor, a motor bracket (1), a crankcase (2), a capacitor, a capacitor baffle (3) and an air guide cover (4); the two ends of the drive motor housing are respectively connected to the inner side surface of the crankcase (2) and the inner side surface of the motor bracket (1), and the output end of the drive motor is connected to a cooling fan; the screw on the bottom surface of the capacitor passes through the corresponding hole position of the capacitor baffle (3) and is connected to the protrusion of the crankcase (2), and the capacitor baffle (3) is clamped and fixed by the bottom surface of the capacitor and the protrusion surface of the crankcase (2); the air guide cover (4) covers the outside of all parts; The capacitor baffle (3) comprises a heat dissipation portion (31) and a capacitor shielding portion (32); the heat dissipation portion (31) comprises a waterproof step (311); the waterproof step (311) protrudes from the end surface of the heat dissipation portion (31), and the waterproof step (311) shields the gap between the edge of the crankcase (2) and the end surface of the heat dissipation portion (31); the capacitor shielding portion (32) comprises a shielding upper cover (321) and a shielding rear cover (322); the heat dissipation portion (31) at the front end, the shielding upper cover (321) at the upper end, and the shielding rear cover (322) at the rear end are connected A cavity opening downward is formed, and the capacitor is entirely wrapped inside the open cavity; the shielding upper cover (321) comprises an upper cover (3211) and a side cover (3212); the upper cover (3211) is located above the capacitor, a plurality of side covers (3212) are respectively located on two side surfaces of the capacitor, and the bottom surfaces of the side covers (3212) are lower than the lowest position of the capacitor; the capacitor baffle (3) further comprises a water flow guide portion (33), the upper end of the water flow guide portion (33) is connected to the lower end of the side covers (3212), and the water flow guide portion (33) is located outside the drive motor.

2. An air compressor with improved waterproof grade according to claim 1, characterized in that: The upper blocking cover (3211) is in an arc shape.

3. The air compressor with improved waterproof grade according to claim 1, characterized in that: The upper end of the water flow guide portion (33) is connected to the lower end of the side baffle (3212) via an arc surface transition; the water flow guide portion (33) comprises a water flow guide groove (331); the upper and lower ends of the water flow guide groove (331) are respectively connected to the head and tail ends of the water flow guide portion (33).

4. The air compressor with improved waterproof grade according to claim 1, characterized in that: The upper baffle cover (3211), the side baffle cover (3212) and the water flow guide portion (33) all include a baffle cover curling edge (30); the baffle cover curling edge (30) is located at the edges of the upper baffle cover (3211), the side baffle cover (3212) and the water flow guide portion (33) and protrudes from the surfaces of the upper baffle cover (3211), the side baffle cover (3212) and the water flow guide portion (33).

5. The air compressor with improved waterproof grade according to claim 1, characterized in that: The crankcase (2) comprises a case (21), a cylinder boss (22), guide ribs (23), a cover shell fitting surface (24) and a motor boss (25); the cylinder boss (22) protrudes above the case (21), the cylinder boss (22) is connected to the upper surface of the case (21) via a plurality of guide ribs (23), and the ends of the guide ribs (23) do not contact the motor boss (25); the cover shell fitting surface (24) is located on the rear side of the case (21), and the cover shell fitting surface (24) is seamlessly connected to the front side of the air guide cover; the motor boss (25) protrudes from the rear side of the case (21) and is connected to the driving motor housing, and a concave drainage groove (26) is provided on the surface of the motor boss (25).

6. An air compressor with improved waterproof grade according to claim 5, characterized in that: The drainage groove (26) is located at the intersection of the motor boss (25) and the rear side surface of the box body (21); the upper initial end of the drainage groove (26) is higher than the horizontal symmetry plane in the middle of the motor boss (25), and the lower end end of the drainage groove (26) is lower than the horizontal symmetry plane in the middle of the motor boss (25).

7. The air compressor with improved waterproof grade according to claim 1, characterized in that: The motor bracket (1) comprises a bracket bottom plate (11), a bracket rib plate (12) and a bracket baffle plate (13); the bracket bottom plate (11) is connected to the rear end of the drive motor housing; the bracket rib plate (12) is fixed to the bracket bottom plate (11), and the rear output end of the drive motor passes through the center holes of the bracket bottom plate (11) and the bracket rib plate (12) to be connected to the cooling fan; the bracket baffle plate (13) protrudes from the front side surface of the bracket bottom plate (11), and the bracket baffle plate (13) covers the upper part of the rear output end circuit of the drive motor; The support baffle (13) is an arc-shaped baffle, and the arc of the support baffle (13) fits the outermost arc of the support bottom plate (11); The support baffles (13) are symmetrically distributed along the rear output shaft of the drive motor.

8. An air compressor with improved waterproof grade according to claim 7, characterized in that: The support baffle (13) comprises a baffle reinforcing rib (131); the baffle reinforcing rib (131) protrudes from the front edge of the support baffle (13).

9. The air compressor with improved waterproof grade according to claim 1, characterized in that: The air guide cover (4) comprises ventilation holes (41); the plurality of ventilation holes (41) are located above the air guide cover (4), and the ventilation holes (41) are filled with fillers.

10. The air compressor with improved waterproof grade according to claim 1, characterized in that: The air guide cover (4) further comprises an air inlet slot (42); the air inlet slot (42) is located on a side of the air guide cover (4), and the slot width of the air inlet slot (42) meets IP32 test requirements.

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