Air blower with waterproof function

Abstract

The utility model discloses an air blower with a waterproof function, and aims to overcome the defects that in the prior art, when an air blower is used in rainy days, rainwater easily enters a motor of the air blower, so that the circuit of the motor is short-circuited, and accidents such as electric leakage and motor burnout occur. The technical problem is solved through the following technical scheme: the centrifugal fan comprises a volute, an impeller arranged in the volute and a motor for driving the impeller to rotate, the volute comprises a first shell and a second shell, and the first shell and the second shell are matched to form a cavity in the volute; a ventilation area corresponding to the motor is arranged on the side wall of the second shell, an output shaft of the motor penetrates through the ventilation area to be connected with the impeller, and water retaining protruding ribs are arranged on the periphery of the ventilation area. The periphery of the ventilation area is provided with the water retaining convex ribs, so that rainwater entering the ventilation area is blocked, the rainwater is prevented from entering the motor from the ventilation area, and the waterproof performance of the motor can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of blowers, and more particularly to a blower with a waterproof function. Background Art

[0002] When a blower is used outdoors, encountering rain or special environments, the blower's waterproof performance directly affects its performance. However, existing blowers cannot strike a balance between waterproofness and heat dissipation, often compromising one while neglecting the other. Existing blowers often require spray testing to simulate outdoor rain conditions. During this simulation, rainwater directly enters the blower's motor, causing a short circuit in the blower's motor circuit, leading to accidents such as leakage and motor burnout, shortening the blower's service life. Utility Model Content

[0003] The utility model overcomes the deficiency in the prior art that when the blower is used on rainy days, rainwater easily enters the motor of the blower, causing a short circuit in the motor circuit, and then causing accidents such as leakage and motor burning. The utility model provides a blower with a waterproof function, which can improve the waterproof performance of the motor when used on rainy days, making it difficult for rainwater to enter the interior of the motor, and thus no accidents such as leakage and motor burning due to water entering the motor will occur.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a blower with waterproof function, comprising: a volute, an impeller arranged in the volute and a motor for driving the impeller to rotate; the volute comprises a first shell and a second shell, the first shell and the second shell cooperate to form a cavity in the volute; the side wall of the second shell is provided with a ventilation area corresponding to the motor, the output shaft of the motor passes through the ventilation area and is connected to the impeller, and water-retaining ribs are provided on the periphery of the ventilation area.

[0005] The utility model is provided with a ventilation area on the second housing, and the ventilation area allows wind to enter the installation cavity through the ventilation area, thereby dissipating heat from the motor in the installation cavity; and in order to prevent rainwater from entering the motor, a water-retaining rib is provided on the periphery of the ventilation area, thereby blocking rainwater from entering the ventilation area and preventing rainwater from entering the motor through the ventilation area, thereby improving the waterproof performance of the motor, allowing the blower to be used normally even when it rains outdoors, thereby preventing accidents such as leakage and motor burning due to water entering the motor.

[0006] Preferably, it also includes a motor rear shell, and the outer side wall of the second shell is provided with a first rear shell, and the first rear shell and the motor rear shell cooperate to form an installation cavity; the motor is arranged in the installation cavity; and a drainage hole connected to the outside is provided at the bottom of the installation cavity.

[0007] A drainage hole is also provided at the bottom of the installation cavity, so that rainwater entering the installation cavity can be discharged through the drainage hole to prevent water accumulation in the installation cavity.

[0008] Preferably, a rear air vent is provided at the end of the rear housing of the motor away from the first housing, and the rear air vent is provided with a water shield.

[0009] The rear air vent can increase the heat dissipation performance of the motor, and the water shield can shield rainwater, thereby preventing rainwater from entering the installation cavity through the rear air vent.

[0010] Preferably, a first water retaining grille is provided at the rear air vent.

[0011] The water retaining grille can prevent rainwater from directly entering the installation cavity from the rear vent, while allowing air to smoothly enter the installation cavity from the first water retaining grille, thereby ensuring the heat dissipation performance of the motor while ensuring the waterproof performance of the motor.

[0012] Preferably, the ventilation area includes a main air inlet area arranged at the center and an auxiliary air inlet area arranged outside the main air inlet area; a plurality of main air inlets are arranged in the circumferential direction of the main air inlet area, and a second water retaining grille is arranged at the main air inlet.

[0013] The wind can enter the installation cavity from the main air inlet to dissipate heat for the motor. The second water retaining grille can prevent rainwater from entering the interior of the motor and damaging the components inside the motor.

[0014] Preferably, the second water retaining grille includes two staggered positive L-shaped columns and an inverted L-shaped column.

[0015] Wind enters the interior of the motor through the channel between the positive L-shaped column and the reverse L-shaped column, thereby preventing rain from entering the interior of the motor and damaging the internal components of the motor.

[0016] Preferably, the main air inlet area is provided with a boss protruding into the cavity, the boss forms a groove on the outer side of the second shell, and the end of the motor close to the output shaft abuts in the groove.

[0017] The cooperation between the groove and the motor enables the motor to be conveniently and stably fixed in the groove.

[0018] Preferably, the motor includes a motor front cover and a motor rear cover, the motor front cover is provided with front cover side holes in the circumferential direction, and the end of the motor front cover is provided with several front cover end holes corresponding to the main air inlet; a second rear shell is provided in the outer circumferential direction of the groove, the diameter of the second rear shell is larger than the diameter of the groove, the inner side wall of the second rear shell is provided with a rear shell ridge along its axial direction, the end of the motor front cover abuts the groove, and the outer side wall of the motor front cover abuts the rear shell ridge.

[0019] The ridges of the rear shell can fix and abut the side walls of the motor front cover, so that a certain gap is formed between the outer wall of the motor front cover and the inner side of the second rear shell, so that the heat in the motor can be dissipated into the installation cavity through the gap, thereby further improving the heat dissipation performance of the motor.

[0020] Preferably, the auxiliary air inlet area is provided with several auxiliary air inlets, the second rear shell and the first rear shell cooperate to form an auxiliary ventilation channel, and the auxiliary air inlet is connected to the auxiliary ventilation channel; the auxiliary air inlet is provided with a third water retaining grille.

[0021] Air from the auxiliary air inlet passes through the auxiliary ventilation channel before entering the installation cavity, cooling and dissipating heat for the motor inside the installation cavity. A third water retaining grille is installed at the auxiliary air inlet to block rainwater at the auxiliary air inlet, further improving the waterproof performance.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The utility model features three waterproof structures on the second housing: a water-blocking rib, a second water-blocking grille, and a third water-blocking grille. The water-blocking ribs prevent most water from entering the ventilation area. Wind entering the ventilation area partially enters the mounting cavity through the auxiliary air inlet, while the remainder enters the mounting cavity through the main air inlet, thereby dissipating heat from the motor. The second water-blocking grille on the main air inlet and the third water-blocking grille on the auxiliary air inlet effectively block rainwater, preventing it from entering the mounting cavity through the auxiliary and main air inlets. A water-blocking cover and the first water-blocking grille are provided over the rear ventilation opening on the motor rear housing, ensuring both heat dissipation and waterproofing. A drainage hole is also provided at the bottom of the mounting cavity, allowing rainwater that enters to drain out, preventing water from accumulating inside. Therefore, the utility model provides excellent heat dissipation and waterproofing, effectively preventing rainwater from entering the mounting cavity and damaging the motor's performance during rainy days. Rainwater is not easy to enter the interior of the motor, and accidents such as leakage and motor burning will not occur due to water entering the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall structure diagram of the utility model.

[0025] Figure 2 It is a cross-sectional view of the present utility model.

[0026] Figure 3 It is an exploded view of the present utility model.

[0027] Figure 4 It is an exploded view of the present invention from another angle.

[0028] Figure 5 It is a three-dimensional structural diagram of the second shell of the present utility model.

[0029] Figure 6 It is a three-dimensional structural diagram of the second shell of the present invention from another angle.

[0030] Figure 7 It is a cross-sectional view of the second shell of the present invention.

[0031] Figure 8 It is a cross-sectional view of the rear housing of the motor of the present invention.

[0032] In the figure: 1, first housing, 11, air inlet, 12, air outlet, 13, mesh cover;

[0033] 2. Second shell, 21. Water retaining rib, 22. Main air inlet area, 221. Main air inlet, 222. Second water retaining grille, 2221. Positive L-shaped column, 2222. Reverse L-shaped column, 223. Boss, 224. Center perforation, 225. Groove, 23. Auxiliary air inlet area, 231. Auxiliary air inlet, 232. Third water retaining grille, 233. Auxiliary ventilation channel, 24. First rear shell, 25. Second rear shell, 251. Rear shell ridge;

[0034] 3. Impeller;

[0035] 4. Motor, 41. Motor front cover, 411. Front cover side hole, 412. Front cover end hole, 42. Motor rear cover, 421. Rear cover side hole, 422. Rear cover end hole;

[0036] 5. Motor rear housing;

[0037] 6. Installation cavity, 61. Drain hole, 62. Water retaining cover, 63. First water retaining grille, 631. First baffle, 632. First L-shaped plate. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0039] Example 1: Reference Figures 1 to 8 As shown, a blower with waterproof function is characterized in that it includes: a volute, an impeller 3 arranged in the volute and a motor 4 for driving the impeller 3 to rotate; the volute includes a first shell 1 and a second shell 2, and the first shell 1 and the second shell 2 cooperate with each other to form a cavity in the volute; the side wall of the second shell 2 is provided with a ventilation area corresponding to the motor 4, the output shaft of the motor 4 passes through the ventilation area and is connected to the impeller 3, and a water-retaining rib 21 is provided on the periphery of the ventilation area.

[0040] The volute is arranged in a cavity formed by the cooperation of the first shell 1 and the second shell 2. The water retaining rib 21 is annular and surrounds the periphery of the ventilation area.

[0041] A first rear shell 24 is provided on the side of the second housing 2 away from the first housing 1. In this embodiment, the first rear shell 24 is integrally formed with the second housing 2. The first rear shell 24 cooperates with the motor rear shell 5 to form a mounting cavity 6 for mounting the motor 4.

[0042] The water-retaining rib 21 and the first rear shell 24 are respectively disposed on the inner and outer sides of the second shell 2. The water-retaining rib 21 is disposed on the inner side of the second shell 2, while the first rear shell 24 is disposed on the outer side of the second shell 2. An air inlet 11 is disposed at the center of the first shell 1. Wind enters the volute through the air inlet 11 of the first shell 1 and is then ejected from the air outlet 12 by the impeller 3. A mesh cover 13 is disposed at the air inlet 11. When wind flows through the volute, the water-retaining rib 21 acts as a shield against rainwater, thereby preventing rainwater from entering the motor 4 through the ventilated area and affecting the performance of the motor 4.

[0043] The first rear shell 24 surrounds the periphery of the ventilation area, allowing wind to pass from the volute through the ventilation area of the second housing 2 and into the installation cavity 6. Thus, wind can enter the installation cavity 6 from the ventilation area to dissipate heat from the interior of the motor 4. In this embodiment, the first rear shell 24 and the water retaining ribs 21 are disposed at corresponding positions on both sides of the second housing 2.

[0044] In addition, this embodiment provides a drainage hole 61 at the bottom of the mounting cavity 6, which communicates with the outside world. When rainwater enters the mounting cavity 6, it can flow downward along the sidewalls of the mounting cavity 6 and then be discharged from the drainage hole 61 at the bottom. The drainage hole 61 in this embodiment is provided between the connection point between the first rear housing 24 and the motor rear housing 5, that is, a notch is provided at the edge of the first rear housing 24. When the motor rear housing 5 is mated with the first rear housing 24, the notch is blocked by the motor rear housing 5, thus forming the drainage hole 61 in this embodiment.

[0045] In one embodiment, to further improve the heat dissipation performance of the motor 4, a conventional blower is provided with a ventilation mesh cover 13 at the motor rear housing 5. However, this allows rainwater to easily enter the motor rear housing 5 through the ventilation mesh cover 13, thereby affecting the performance of the motor 4. Therefore, in this embodiment, a rear ventilation port is provided at the end of the motor rear housing 5 away from the first housing 1, and a water shield 62 is provided at the rear ventilation port, with the upper surface of the water shield 62 being inclined. The water shield 62 can block rainwater, thereby preventing rainwater from entering the mounting cavity 6 through the rear ventilation port.

[0046] In one embodiment, in order to further improve the rainproof performance of the rear air vent, a first water retaining grille 63 is provided at the rear air vent. The first water retaining grille 63 includes a plurality of first baffles 631 provided at the rear air vent and spaced apart. A plurality of first L-shaped plates 632 are provided on the inner side of the first baffles 631 near the mounting cavity 6. The intervals between the first L-shaped plates 632 and the first baffles 631 are adapted, that is, the first L-shaped plates 632 and the first baffles 631 cooperate to form the first water retaining grille 63. The provision of the water retaining grille can not only prevent rainwater from directly entering the mounting cavity 6 from the rear air vent, but also allow air to smoothly enter the mounting cavity 6 from the first water retaining grille. Thus, while ensuring the heat dissipation performance of the motor 4, the waterproof performance of the motor 4 is also ensured.

[0047] In this embodiment, a ventilation area is provided on the second shell 2. The ventilation area allows wind to enter the installation cavity 6 from the ventilation area, thereby dissipating heat for the motor 4 in the installation cavity 6. In order to prevent rainwater from entering the motor 4, a water-retaining rib 21 is provided on the periphery of the ventilation area, thereby blocking rainwater entering the ventilation area, thereby improving the waterproof performance of the motor 4 and allowing the blower to be used normally even when it rains outdoors. A water-retaining cover 62 and a first water-retaining grille 63 are provided on the rear ventilation opening on the rear motor shell 5, thereby ensuring the waterproof performance of the motor 4 while ensuring heat dissipation of the motor 4. A drainage hole 61 is also provided at the bottom of the installation cavity 6, so that rainwater entering the installation cavity 6 can be discharged through the drainage hole 61, thereby preventing water accumulation in the installation cavity 6.

[0048] Therefore, the present invention has a good waterproof function under the premise of having good heat dissipation performance, so that in the case of rainy days outdoors, it can effectively prevent rainwater from entering the installation cavity 6 and damaging the performance of the motor 4. Rainwater is not easy to enter the interior of the motor 4, and thus there will be no accidents such as leakage or burning of the motor 4 due to water entering the motor 4.

[0049] Example 2: Reference Figures 1 to 8 As shown, a blower with waterproof function is characterized in that it includes: a volute, an impeller 3 arranged in the volute and a motor 4 for driving the impeller 3 to rotate; the volute includes a first shell 1 and a second shell 2, and the first shell 1 and the second shell 2 cooperate with each other to form a cavity in the volute; the side wall of the second shell 2 is provided with a ventilation area corresponding to the motor 4, the output shaft of the motor 4 passes through the ventilation area and is connected to the impeller 3, and a water-retaining rib 21 is provided on the periphery of the ventilation area.

[0050] The volute is arranged in a cavity formed by the cooperation of the first shell 1 and the second shell 2. The water retaining rib 21 is annular and surrounds the periphery of the ventilation area.

[0051] A first rear shell 24 is provided on the side of the second housing 2 away from the first housing 1. In this embodiment, the first rear shell 24 is integrally formed with the second housing 2. The first rear shell 24 cooperates with the motor rear shell 5 to form a mounting cavity 6 for mounting the motor 4.

[0052] The water-retaining rib 21 and the first rear shell 24 are respectively disposed on the inner and outer sides of the second shell 2. The water-retaining rib 21 is disposed on the inner side of the second shell 2, while the first rear shell 24 is disposed on the outer side of the second shell 2. An air inlet 11 is disposed at the center of the first shell 1. Wind enters the volute through the air inlet 11 of the first shell 1 and is then ejected from the air outlet 12 by the impeller 3. A mesh cover 13 is disposed at the air inlet 11. When wind flows through the volute, the water-retaining rib 21 acts as a shield against rainwater, thereby preventing rainwater from entering the motor 4 through the ventilated area and affecting the performance of the motor 4.

[0053] The first rear shell 24 surrounds the periphery of the ventilation area, allowing wind to pass from the volute through the ventilation area of the second housing 2 and into the installation cavity 6. Thus, wind can enter the installation cavity 6 from the ventilation area to dissipate heat from the interior of the motor 4. In this embodiment, the first rear shell 24 and the water retaining ribs 21 are disposed at corresponding positions on both sides of the second housing 2.

[0054] In addition, this embodiment provides a drainage hole 61 at the bottom of the mounting cavity 6, which communicates with the outside world. When rainwater enters the mounting cavity 6, it can flow downward along the sidewalls of the mounting cavity 6 and then be discharged from the drainage hole 61 at the bottom. The drainage hole 61 in this embodiment is provided between the connection point between the first rear housing 24 and the motor rear housing 5, that is, a notch is provided at the edge of the first rear housing 24. When the motor rear housing 5 is mated with the first rear housing 24, the notch is blocked by the motor rear housing 5, thus forming the drainage hole 61 in this embodiment.

[0055] In one embodiment, to further improve the heat dissipation performance of the motor 4, a conventional blower is provided with a ventilation mesh cover 13 at the motor rear housing 5. However, this allows rainwater to easily enter the motor rear housing 5 through the ventilation mesh cover 13, thereby affecting the performance of the motor 4. Therefore, in this embodiment, a rear ventilation port is provided at the end of the motor rear housing 5 away from the first housing 1, and a water shield 62 is provided at the rear ventilation port, with the upper surface of the water shield 62 being inclined. The water shield 62 can block rainwater, thereby preventing rainwater from entering the mounting cavity 6 through the rear ventilation port.

[0056] In one embodiment, in order to further improve the rainproof performance of the rear air vent, a first water retaining grille 63 is provided at the rear air vent. The first water retaining grille 63 includes a plurality of first baffles 631 provided at the rear air vent and spaced apart. A plurality of first L-shaped plates 632 are provided on the inner side of the first baffles 631 near the mounting cavity 6. The intervals between the first L-shaped plates 632 and the first baffles 631 are adapted, that is, the first L-shaped plates 632 and the first baffles 631 cooperate to form the first water retaining grille 63. The provision of the water retaining grille can not only prevent rainwater from directly entering the mounting cavity 6 from the rear air vent, but also allow air to smoothly enter the mounting cavity 6 from the first water retaining grille. Thus, while ensuring the heat dissipation performance of the motor 4, the waterproof performance of the motor 4 is also ensured.

[0057] The difference between this embodiment and embodiment 1 is that the ventilation area includes a main air inlet area 22 arranged at the center position and an auxiliary air inlet area 23 arranged outside the main air inlet area 22; a plurality of main air inlets 221 are arranged in the circumferential direction of the main air inlet area 22, and a second water retaining grille 222 is arranged at the main air inlet 221.

[0058] The main air inlet area 22 is provided with a boss 223 that protrudes into the cavity. The boss 223 is circular, and the main air inlet 221 is provided on the boss 223. The boss 223 protrudes toward the inner side of the second shell 2. A central through-hole 224 is provided at the center of the boss 223. The output shaft of the motor 4 passes through the central through-hole 224 and is fixedly connected to the impeller 3. The main air inlet 221 is provided in the circumferential direction of the central through-hole 224. In this embodiment, four main air inlets 221 are provided on the boss 223. Wind can enter the mounting cavity 6 from the main air inlet 221 to dissipate heat for the motor 4.

[0059] Corresponding to the boss 223 , the boss 223 forms a groove 2255 on the outer side of the second housing 2 , and the end of the motor 4 close to the output shaft abuts in the groove 225 .

[0060] Motor 4 includes a front cover 41 and a rear cover 42. The front cover 41 is circumferentially provided with a plurality of front cover side holes 411, and the ends of the front cover 41 are provided with a plurality of front cover end holes 412 corresponding to the main air inlet 221. The rear cover 42 is circumferentially provided with a plurality of rear cover side holes 421, and the ends of the rear cover 42 are provided with a plurality of rear cover end holes 422. The numerous holes in the rear cover 42 and the front cover 41 improve heat dissipation from the stator and rotor within the motor 4.

[0061] In addition, the front cover end hole on the motor front cover 41 corresponds to the main air inlet 221 in this embodiment, so that the wind can pass through the main air inlet 221 and the front cover end hole to dissipate heat to the stator, rotor and other components inside the motor 4, thereby achieving a good heat dissipation effect on the inside of the motor 4.

[0062] A second water retaining grille 222 is provided at the main air inlet 221. The second water retaining grille 222 includes two staggered positive L-shaped columns 2221 and an inverted L-shaped column 2222. Wind enters the interior of the motor 4 through the channel between the positive L-shaped column 2221 and the inverted L-shaped column 2222. This prevents rainwater from entering the interior of the motor 4 and damaging the components inside the motor 4.

[0063] In addition, a second rear shell 25 is disposed circumferentially of the groove 225. Like the first rear shell 24, the second rear shell 25 is disposed outside the second housing 2, and the first rear shell 24 is disposed peripherally of the second rear shell 25. Furthermore, the diameter of the second rear shell 25 is greater than the diameter of the groove 225. A rear shell ridge 251 is disposed along the inner sidewall of the second rear shell 25 in its axial direction. The end of the motor front cover 41 abuts the groove 225, and the outer circumferential wall of the motor front cover 41 abuts the rear shell ridge 251.

[0064] The rear shell ridge 251 can fix and abut the side wall of the motor front cover 41, so that a certain gap is formed between the outer wall of the motor front cover 41 and the inner side of the second rear shell 25, so that the heat in the motor 4 can be dissipated into the installation cavity 6 through the gap, thereby further improving the heat dissipation performance of the motor 4.

[0065] The auxiliary air inlet area 23 is provided with a number of auxiliary air inlets 231, and the auxiliary air inlet 231 is provided with a third water retaining grille 232. The auxiliary air inlet area 23 is similar to an annular area, and the auxiliary air inlet 231 is provided in the annular area. The second rear shell 25 corresponds to the position of the main air inlet area 22, and the first rear shell 24 corresponds to the position of the ventilation area. Therefore, an auxiliary ventilation channel 233 is formed between the second rear shell 25 and the first rear shell 24. The wind can enter the installation cavity 6 only after passing through the auxiliary ventilation channel 233 from the auxiliary air inlet 231, which has the effect of cooling and dissipating heat for the motor 4 in the installation cavity 6. The third water retaining grille 232 is provided at the position of the auxiliary air inlet 231, which can block the rainwater at the auxiliary air inlet 231, further improving the waterproof performance.

[0066] In this embodiment, three waterproof structures are provided on the second housing 2, namely, a water-blocking rib 21, a second water-blocking grille 222, and a third water-blocking grille 232. The water-blocking rib 21 can prevent most water from entering the ventilation area. Of the wind that enters the ventilation area, part enters the installation cavity 6 through the auxiliary air inlet 231, and the other part enters the installation cavity 6 through the main air inlet 221, thereby dissipating heat from the motor 4. Since the second water-blocking grille 222 is provided on the main air inlet 221, and the third water-blocking grille 232 is provided on the auxiliary air inlet 231, both can effectively block rainwater, preventing rainwater from entering the installation cavity 6 through the auxiliary air inlet 231 and the main air inlet 221. A water-blocking cover 62 and a first water-blocking grille 63 are provided on the rear ventilation opening on the motor rear housing 5, thereby ensuring heat dissipation from the motor 4 while also ensuring the waterproof performance of the motor 4. A drainage hole 61 is further provided at the bottom of the installation cavity 6 , so that rainwater entering the installation cavity 6 can be discharged through the drainage hole 61 , thereby preventing water accumulation in the installation cavity 6 .

[0067] Therefore, the present invention has a good waterproof function under the premise of having good heat dissipation performance, so that in the case of rainy days outdoors, it can effectively prevent rainwater from entering the installation cavity 6 and damaging the performance of the motor 4. Rainwater is not easy to enter the interior of the motor 4, and thus there will be no accidents such as leakage or burning of the motor 4 due to water entering the motor 4.

[0068] The above-described embodiments are only preferred solutions of the present invention and do not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A blower with waterproof function, characterized in that: include: A volute, an impeller disposed in the volute, and a motor for driving the impeller to rotate; the volute includes a first shell and a second shell, the first shell and the second shell cooperate to form a cavity in the volute; The side wall of the second shell is provided with a ventilation area corresponding to the motor. The output shaft of the motor passes through the ventilation area and is connected to the impeller. The periphery of the ventilation area is provided with water retaining ribs.

2. The waterproof blower according to claim 1, characterized in that: It also includes a motor rear shell, and the outer side wall of the second shell is provided with a first rear shell, and the first rear shell and the motor rear shell cooperate to form an installation cavity; the motor is arranged in the installation cavity; and a drainage hole connected to the outside is provided at the bottom of the installation cavity.

3. The waterproof blower according to claim 2, characterized in that: The end of the motor rear shell away from the first shell is provided with a rear air vent, and the rear air vent is provided with a water shield.

4. The waterproof blower according to claim 3, characterized in that: A first water retaining grille is provided at the rear air vent.

5. The waterproof blower according to claim 1, characterized in that: The ventilation area includes a main air inlet area arranged at the center and an auxiliary air inlet area arranged outside the main air inlet area; a plurality of main air inlets are arranged in the circumferential direction of the main air inlet area, and a second water retaining grille is arranged at the main air inlet.

6. The waterproof blower according to claim 5, characterized in that: The second water retaining grid includes two staggered positive L-shaped columns and an inverted L-shaped column.

7. The waterproof blower according to claim 5 or 6, characterized in that: The main air inlet area is provided with a boss protruding into the cavity, the boss forms a groove on the outer side of the second shell, and the end of the motor close to the output shaft abuts in the groove.

8. The waterproof blower according to claim 7, characterized in that: The motor includes a motor front cover and a motor rear cover. The motor front cover is provided with front cover side holes in the circumferential direction, and the end of the motor front cover is provided with several front cover end holes corresponding to the main air inlet; a second rear shell is provided in the outer circumferential direction of the groove, the diameter of the second rear shell is larger than the diameter of the groove, and the inner side wall of the second rear shell is provided with a rear shell ridge along its axial direction. The end of the motor front cover abuts the groove, and the outer side wall of the motor front cover abuts the rear shell ridge.

9. The waterproof blower according to claim 8, characterized in that: The auxiliary air inlet area is provided with a plurality of auxiliary air inlets. The second rear shell and the first rear shell cooperate to form an auxiliary ventilation channel. The auxiliary air inlet is connected to the auxiliary ventilation channel. The auxiliary air inlet is provided with a third water retaining grille.

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