Gauze quick-release structure, ventilating fan and motor home

Abstract

The utility model relates to a quick release structure of gauze, ventilator and limo, it relates to limo article field, its ventilator includes quick release structure and fan subassembly, wherein quick release structure includes upper shell, middle shell, lower shell, gauze subassembly and locking subassembly, fan subassembly is fixedly installed on the middle shell, gauze subassembly is installed on the lower shell through locking subassembly. According to the utility model, by arranging the locking assembly, the gauze element assembly can be quickly disassembled and assembled on the lower shell, the gauze element assembly can be conveniently and quickly replaced, and the convenience of cleaning and replacing the gauze element is improved.

Description

[0001] This utility model is a divisional application. The original application number is 2024219674664, the application date is August 14, 2024, and the title is "A ventilation fan for a motorhome and a motorhome using the ventilation fan". Technical Field

[0002] This utility model relates to the field of RV supplies, and in particular to a quick-release mesh structure, a ventilation fan, and an RV. Background Technology

[0003] A motorhome is a special type of vehicle that combines the functions of a bed, kitchen appliances, and other living appliances with a travel vehicle. The ventilation fan is a crucial component of the motorhome's ventilation system, primarily used to regulate the humidity and temperature inside the vehicle and remove odors, moisture, and harmful gases. When installing a motorhome ventilation fan, a screen is usually added to reduce the entry of insects, debris, and other unwanted substances into the motorhome through the fan openings.

[0004] Currently, the screens in RV ventilation fans are usually fixed to the ventilation fan by screws or clips. When cleaning or replacing the screens, tools are needed to remove and install them, which is inefficient and inconvenient. Utility Model Content

[0005] To improve the efficiency of fixing or removing the ventilation fan screen and enhance the convenience of replacing the ventilation fan, this utility model provides a quick-release screen structure, a ventilation fan, and a motorhome.

[0006] First aspect: This utility model provides a quick-release structure for a mesh screen, employing the following technical solution:

[0007] A quick-release mesh structure includes: a lower inner frame and a mesh assembly, wherein the lower inner frame is provided with an opening, the mesh assembly covers the opening, and a snap hole is provided on the side wall of the opening of the lower inner frame.

[0008] The mesh assembly includes a mesh body and a mesh outer frame. The mesh body is fixedly disposed at the opening of the mesh outer frame. A locking pin is provided on one side of the mesh outer frame and is inserted into the locking hole. A locking component is provided on the side of the mesh outer frame away from the locking pin. The mesh outer frame is connected to the inner frame of the lower shell through the locking component.

[0009] By adopting this technical solution, the mesh assembly is first aligned with the opening of the inner frame of the lower shell. Next, the side of the outer frame of the mesh with the locking pin is aligned with the side of the inner frame of the lower shell with the locking hole, and the locking pin is inserted into the locking hole. Finally, the locking component is used to fix the other side of the outer frame of the mesh to the side wall of the opening of the inner frame of the lower shell. To remove the mesh assembly from the inner frame of the lower shell, first loosen the connection of the locking component on the inner frame of the lower shell, and then remove the locking pin from the locking hole. This combination of locking pin and locking component allows for quick assembly and disassembly of the mesh assembly on the inner frame of the lower shell, facilitating rapid replacement of the mesh assembly and improving the convenience of cleaning and replacing the mesh.

[0010] Optionally, the lower shell inner frame is provided with an insertion hole. The locking assembly includes a swing block, a fastening pin, a cylindrical pin, and a spring. The fastening pin is slidably disposed on the outer frame of the mesh. The swing block includes a cam part and a handle part. The handle part is fixedly connected to the cam part. One end of the fastening pin is rotatably connected to the cam part through the cylindrical pin. The outer peripheral surface of the cam part contacts the inner wall of the outer frame of the mesh. One end of the spring is connected to the fastening pin, and the other end is connected to the outer frame of the mesh. The spring has a tendency to cause the fastening pin to extend outward. The fastening pin is pulled out of or inserted into the insertion hole.

[0011] By employing this technical solution, when using the locking assembly to fix the outer frame of the mesh and the inner frame of the lower shell, first pull the handle. The handle moves the cam, which in turn moves the fastening pin to slide on the outer frame of the mesh. Then, as the fastening pin retracts into the outer frame, place the outer frame into the corresponding opening in the inner frame of the lower shell. When the fastening pin aligns with the insertion hole, release the handle. The fastening pin, under the action of the spring, extends into the outer frame and inserts into the corresponding insertion hole, thus fixing the outer frame and the inner frame of the lower shell. To disassemble the mesh assembly, first pull the handle to compress the spring, and as the fastening pin retracts from the insertion hole into the outer frame, remove the outer frame from the opening in the inner frame of the lower shell. This combination of fastening pin and spring allows the fastening pin, which slides on the outer frame, to be inserted into the inner frame of the lower shell, achieving rapid fixing of the outer frame and the inner frame and simplifying the assembly and disassembly of the mesh assembly.

[0012] Optionally, the cam portion is eccentrically configured.

[0013] By adopting this technical solution, the cam part is set as an eccentric structure. The cam part can be rotated by the handle. Because the cam part is set as an eccentric structure and its outer peripheral surface abuts against the inner wall of the mesh frame, the rotation of the cam part can compress the spring, eliminating the need to pull the handle part to move the cam part. In this way, by setting an eccentric cam to compress the spring, the eccentric cam and the handle part form a force-saving lever structure, and rotating the handle part is easier to hold than pulling it.

[0014] Optionally, the fastening pin is a stepped shaft structure and is disposed in the inner hole of the outer frame of the mesh.

[0015] By adopting this technical solution, the fastening pin is set as a stepped shaft structure, which makes it easier for the spring to abut against the fastening pin, and there is no need to fix the spring and the fastening pin together, which facilitates the installation and fixation of the fastening pin and the spring.

[0016] Optionally, the spring is sleeved on the fastening pin, with one end of the spring abutting against the stepped shaft end face of the fastening pin and the other end abutting against the inner wall of the outer frame of the mesh with an inner hole.

[0017] By adopting this technical solution, during installation, the spring is first fitted onto the fastening pin. Then, the fastening pin and spring are inserted together from one side of the mesh frame into the inner hole of the mesh frame. Next, a cylindrical pin is used to connect the swing block and the fastening pin from the inside of the mesh frame. At this time, the spring is compressed, with one side of the spring abutting against the stepped shaft of the fastening pin and the other side abutting against the side wall of the mesh frame. When the spring is not under force, the fastening pin extends out of the mesh frame under the action of the spring. Rotating or pulling the eccentric swing block can compress the spring, causing the fastening pin to retract into the inner hole of the mesh frame. This saves the space occupied by the fastening pin and spring on the mesh frame and allows the inner hole to fit snugly against the outer circumference of the fastening pin, increasing the stability of the fastening pin sliding in the inner hole, thereby improving the stability of the mesh assembly fixed in the inner frame of the lower shell.

[0018] Secondly, this utility model provides a ventilation fan, which adopts the following technical solution:

[0019] An exhaust fan includes: an upper shell, a middle shell, a lower shell, and a fan assembly. The middle shell and the lower shell are fixedly connected. One side of the upper shell and one side of the middle shell are rotatably connected. The fan assembly is fixedly mounted on the middle shell. The lower shell is provided with a mesh quick-release structure as described in the first aspect.

[0020] By adopting the above technical solution, after the ventilation fan is installed on the middle shell of the quick-release structure, when the ventilation fan ventilates the interior of the RV, the screen component in the quick-release structure can play a certain isolation role, reducing the entry of mosquitoes and foreign objects from the external environment into the interior of the vehicle. After a lot of dust accumulates on the screen component, the screen component can be quickly replaced by locking the component, improving the convenience of cleaning and replacing the screen component and keeping the ventilation fan clean.

[0021] Thirdly: This utility model provides a motorhome, which adopts the following technical solution:

[0022] A motorhome, including a ventilation fan as described in the second aspect.

[0023] In summary, this utility model has at least one of the following beneficial technical effects:

[0024] The quick-release structure uses a combination of latches and locking components to secure the mesh assembly and the inner frame of the lower shell, facilitating the assembly and disassembly of the mesh assembly and effectively improving the convenience of cleaning and replacing it.

[0025] By setting the swing block in the locking assembly to an eccentric cam part and a hand-held part, and by coordinating the swing block, fastening pin and spring, the mesh assembly can be quickly fixed to the inner frame of the lower shell through the locking assembly, realizing the quick fixation of the outer frame of the mesh and the inner frame of the lower shell, and simplifying the operation of assembling and disassembling the mesh assembly.

[0026] Setting the fastening pin as a stepped shaft structure to support the spring can minimize the space occupied by the locking component on the outer frame of the mesh, improve space utilization, and at the same time allow the fastening pin to fit better with the inner hole on the outer frame of the mesh, so that the inner hole can provide more stable support for the fastening pin, thereby improving the stability of the mesh component fixed on the inner frame of the lower shell. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of the ventilation fan in the open state in this embodiment;

[0029] Figure 3 This is a schematic diagram of the ventilation fan in the off state in this embodiment;

[0030] Figure 4 This is a schematic diagram of the overall structure of the lower shell in this embodiment;

[0031] Figure 5 This is a schematic diagram of the lower shell inner frame of this embodiment;

[0032] Figure 6 This is a schematic diagram of the mesh assembly in this embodiment;

[0033] Figure 7 yes Figure 6 Schematic diagram of the A-A cross section;

[0034] Figure 8 This is a schematic diagram of the middle shell structure in this embodiment;

[0035] Figure 9 This is a schematic diagram of the middle shell structure in this embodiment;

[0036] Figure 10 This is a schematic diagram of the driver components in this embodiment;

[0037] Figure 11This is a schematic diagram of the overall structure of the ventilation fan in this embodiment;

[0038] Figure 12 This is a schematic diagram of the fan assembly in this embodiment;

[0039] Figure 13 yes Figure 12 Schematic diagram of the BB cross section;

[0040] Figure 14 This is a schematic diagram of the upper shell structure in this embodiment;

[0041] Figure 15 yes Figure 14 Side sectional view.

[0042] Explanation of reference numerals in the attached drawings: 100, upper shell; 110, flip cover; 111, reinforcing rib; 120, sealing cover; 130, buffer pad; 200, middle shell; 210, frame; 211, sealing strip; 212, rubber sealing ring; 220, support beam; 300, drive assembly; 3011, power source; 310, worm gear reducer; 311, worm wheel; 312, worm shaft; 313, connecting pin; 320, rocker arm shaft; 330, rocker arm; 340, rocker arm pin; 350, guide plate; 360, limit support block; 370, first bushing; 380, second bushing; 390, lifting handle; 400, fan assembly; 410, motor; 4 20. Fan blade assembly; 421. Fan blade body; 422. Multi-tooth connecting shaft; 430. Motor housing; 440. Shaft retaining ring; 500. Lower housing; 510. Inner frame of lower housing; 511. Opening; 5111. Locking hole; 512. Arc-shaped part; 5121. Through hole; 513. Lighting lamp; 514. Function button; 520. Mesh assembly; 521. Mesh body; 522. Mesh outer frame; 5221. Locking pin; 530. Locking assembly; 5301. Swing block; 53011. Cam part; 53012. Handheld part; 5302. Fastening pin; 5303. Cylindrical pin; 5304. Spring; 600. Carriage; 610. Vent. Detailed Implementation

[0043] The following combination Figures 1 to 15 The present invention will be described in further detail below.

[0044] This utility model discloses a motorhome. (Refer to...) Figures 1 to 3 A motorhome includes a ventilation fan and a cabin 600. The ventilation fan includes an upper shell 100, a middle shell 200, a lower shell 500, a fan assembly 400, and a drive assembly 300. The middle shell 200 and the lower shell 500 are fixedly installed on the top of the cabin 600. One side of the upper shell 100 and one side of the middle shell 200 are rotatably connected. The fan assembly 400 is fixedly installed inside the middle shell 200. The drive assembly 300 drives the upper shell 100 and the middle shell 200.

[0045] Reference Figures 1 to 3 The top of the RV's cabin 600 is equipped with a square ventilation opening 610. The middle shell 200 and the lower shell 500 are respectively installed on both sides of the square ventilation opening 610. The middle shell 200 is placed outside the cabin 600, and the lower shell 500 is installed from inside the cabin 600 through the square ventilation opening 610 onto the middle shell 200. The middle shell 200 and the lower shell 500 are fixed to the ventilation opening 610 with screws. After the middle shell 200 and the lower shell 500 are fixedly connected, they will be firmly clamped on both sides of the ventilation opening 610, thereby securing them.

[0046] Reference Figures 4 to 6 The lower shell 500 includes a lower shell inner frame 510, a mesh assembly 520, and a locking assembly 530. The lower shell inner frame 510 is connected to the middle shell 200 by screws. The lower shell inner frame 510 has an opening 511 in the middle and an inwardly protruding arc-shaped part 512 on one side. The arc-shaped part 512 has a through hole 5121. A card hole 5111 is provided on the inner wall of the opening 511 of the lower shell inner frame 510. A lighting lamp 513 and a function button 514 are also provided on the lower surface of the lower shell inner frame 510. The function button 514 is electrically connected to the lighting lamp 513 and the fan assembly 400. The function button 514 can control the lighting lamp 513 and the fan assembly 400.

[0047] Reference Figures 6 to 7 The mesh assembly 520 includes an integrally formed mesh body 521 and a mesh outer frame 522. The mesh body 521 covers the opening in the middle of the mesh outer frame 522. A latch 5221 is provided on one side of the outer mesh frame 522, and a locking component 530 is installed on the other side of the mesh outer frame 522. The mesh assembly 520 can be quickly assembled and disassembled from the opening 511 of the lower shell inner frame 510 by inserting the latch 5221 into the latch hole 5111 of the lower shell inner frame 510 and combining it with the locking component 530.

[0048] Reference Figure 7The locking assembly 530 includes a rocker block 5301, a fastening pin 5302, a cylindrical pin 5303, and a spring 5304. The rocker block 5301 includes a cam portion 53011 and a handle portion 53012. The handle portion 53012 is fixedly disposed on the outer peripheral surface of the cam portion 53011. The cam portion 53011 is eccentrically positioned. The cam portion 53011 and the fastening pin 5302 are connected by the cylindrical pin 5303, which is axially positioned along the cam portion 53011. The rocker block 5301 can rotate around the cylindrical pin 5303. The fastening pin 5302 has a stepped shaft structure and is disposed on the outer frame 522 of the mesh screen. Inside the inner hole, spring 5304 is sleeved on fastening pin 5302. One end of spring 5304 abuts against the stepped shaft end face of fastening pin 5302, and the other end abuts against the inner wall of the inner hole of the outer frame 522 of the mesh. Since the swing block 5301 is eccentrically set, moving the swing block 5301 can compress spring 5304 and pull fastening pin 5302 out of the corresponding insertion hole of the inner frame 510 of the lower shell. At this time, the mesh assembly 520 can be pulled out. Align the locking pin 5221 with the corresponding slot of the inner frame 510 of the lower shell and insert it. Move the swing block 5301 in the opposite direction, and the fastening pin 5302 will spring back under the action of spring 5304 and lock into the corresponding insertion hole of the inner frame 510 of the lower shell. In this way, the mesh assembly 520 can be quickly disassembled and assembled through the cooperation of swing block 5301 and fastening pin 5302, which facilitates the cleaning and replacement of mesh assembly 520.

[0049] Reference Figures 8 to 9 The middle shell 200 includes a frame 210 and a support beam 220. The support beam 220 is located in the middle of the frame 210. The top edge of the frame 210 is provided with a sealing strip 211, which can better seal the frame 210 and the upper shell 100. The bottom edge of the frame 210 is provided with a rubber sealing ring 212, which can better seal the frame 210 and the surface of the carriage 600. A hinge for connecting with the upper shell 100 is provided on one side of the frame 210. The support beam 220 has a U-shaped cross-section. The U-shaped support beam 220 can enhance rigidity and provide more stable support for the fan assembly 400. The two ends of the support beam 220 are fixed to the inner wall of the frame 210.

[0050] Reference Figures 9 to 10The drive assembly 300 includes a power source 3011, a worm gear reducer 310, a rocker arm shaft 320, a rocker arm 330, a rocker arm pin 340, a guide plate 350, a limiting support block 360, a first bushing 370, a second bushing 380, and a lifting handle 390. The worm gear reducer 310 is fixed to one end of the support beam 220. The axial direction of the inner hole of the worm gear 311 of the worm gear reducer 310 is perpendicular to the support beam 220. The middle section of the rocker arm shaft 320 is hexagonal and passes through the inner hole of the worm gear 311 of the worm gear reducer 310. The two ends of the rocker arm shaft 320 are cylindrical. The bushings 370 are rotatably installed at both ends of the rocker arm shaft 320. The two limiting support blocks 360 are fixedly installed on the inner walls of both sides of the frame 210 by screws. The two first bushings 370 are rotatably installed in the inner holes of the corresponding limiting support blocks 360. The two first bushings 370 and the corresponding limiting support blocks 360 installed at both ends of the rocker arm shaft 320 can realize the rotational support of the rocker arm shaft 320. The limiting support blocks 360 and the first bushings 370 can restrict the rocker arm shaft 320 to rotate stably around the axis of the rocker arm shaft 320, so that the upper shell 100 is more stable when it is opened.

[0051] Reference Figure 11 Two rocker arms 330 are provided, one end of which is fixed to the rocker arm shaft 320, and the other end is fixedly connected to the rocker arm pin 340. Two second bushings 380 are rotatably mounted on the corresponding rocker arm pins 340. The guide plate 350 is provided with a long groove, and the second bushings 380 are slidably installed in the long groove of the guide plate 350. The long groove of the rocker arm pin 340 and the guide plate 350 can limit the sliding range. The second bushings 380 can convert the sliding friction between the rocker arm pin 340 and the guide plate 350 into rolling friction between the second bushings 380 and the guide plate 350, thereby reducing wear.

[0052] Reference Figure 11 The worm shaft 312 of the worm gear reducer 310 passes through the through hole 5121 of the arc-shaped part 512. When the power source 3011 is the lifting handle 390, the lifting handle 390 is tightly fitted with the worm shaft 312 of the worm gear reducer 310 through its own hole. The worm shaft 312 is also provided with a connecting pin 313 perpendicular to the worm shaft 312. The lifting handle 390 and the worm shaft 312 are further restricted to rotate circumferentially by the connecting pin 313. Driving the lifting handle 390 to rotate can drive the upper shell 100 to flip through the drive assembly 300. When the power source 3011 is the drive motor, the drive motor is fixedly installed at the bottom of the support beam 220. The output shaft of the drive motor is connected to the worm shaft 312 of the worm gear reducer 310 through a coupling, thereby realizing the manual or electric flipping of the cover 110.

[0053] Reference Figures 12 to 13The fan assembly 400 includes a motor 410, a fan blade assembly 420, a motor housing 430, and a shaft retaining ring 440. The motor 410 is fixed to the support beam 220 on the frame 210 through a threaded hole on its front end face. The motor housing 430 is disposed above the motor 410 and provides protection for the motor 410. The fan blade assembly 420 includes an integrally formed fan blade body 421 and a multi-tooth connecting shaft 422. The multi-tooth connecting shaft 422 is made of metal and... The output shaft of the motor 410 is embedded in the inner hole at the center of the fan blade body 421. The end of the output shaft near the motor 410 has a cylindrical cross-section, and the end away from the motor 410 has a D-shaped cross-section. The end of the D-shaped output shaft away from the motor 410 is provided with a groove. The D-shaped output shaft passes through the D-shaped inner hole of the multi-tooth connecting shaft 422. The shaft retaining ring 440 is stuck in the groove to limit the axial movement of the fan blade assembly 420. The fan blade assembly 420 can be quickly disassembled and cleaned by using a tool to remove the shaft retaining ring 440.

[0054] Reference Figures 14 to 15 The upper shell 100 includes a flip cover 110, a sealing cover 120, and a buffer pad 130. One side of the flip cover 110 is connected to one side of the middle shell 200 by a hinge. The sealing cover 120 is connected to the corresponding hole of the flip cover 110 by screws. The buffer pad 130 is disposed between the flip cover 110 and the sealing cover 120. The buffer pad 130 plays a buffering role during the installation of the flip cover 110 and the sealing cover 120. The flip cover 110 is provided with a reinforcing rib 111. The guide plate 350 is fixed to the reinforcing rib 111 by screws. The reinforcing rib 111 can increase the local strength of the connection between the guide plate 350 and the flip cover 110 and reduce the deformation caused by insufficient strength when the flip cover 110 and the connecting guide plate 350 are connected.

[0055] The specific implementation principle of this utility model embodiment is as follows: During installation, the fan assembly 400 is installed into the middle shell 200, the upper shell 100 and the middle shell 200 are rotatably connected, the drive assembly 300 (excluding the lifting handle 390) is installed into the middle shell 200 and connected to the upper shell 100, the whole consisting of the upper shell 100 and the middle shell 200 is installed from outside the carriage 600 into the corresponding opening 511 at the top of the carriage 600, and the lower shell inner frame 510 is installed from inside the carriage 600 through the corresponding opening 511 into the middle shell 200. Insert the lifting handle 390 and limit it through the connecting pin 313, and install the mesh assembly 520 into the inner frame 510 of the lower shell through the locking pin 5221 and the locking component 530; when in use, the flip cover 110 is opened and closed by manually driving the lifting handle 390 or by electric means. After reaching the appropriate angle, various functions can be operated by remote control or function button 514 on the lower shell 500, such as turning on the ventilation fan, adjusting the wind speed, turning on the light 513, adjusting the brightness and color of the light, setting the timer, etc.

[0056] In summary, this embodiment, by installing multiple rocker arms 330 on the rocker arm shaft 320, ensures that the multiple rocker arms 330 provide consistent speed and force when lifting the flip cover 110, thus providing more stable support for the upper shell 100. Furthermore, the self-locking effect of the worm gear reducer 310 allows the upper shell 100 to be more firmly supported at the current opening degree. By coordinating the locking pin 5221, the locking component 530, and the insertion hole on the lower shell inner frame 510, the mesh component 520 can be quickly mounted on the lower shell inner frame 510. The design allows for quick disassembly and assembly, facilitating subsequent cleaning and replacement of the mesh assembly 520. The structure of the fan assembly 400 has been optimized, improving the dynamic balance of the fan blade assembly 420, reducing resonance during operation, and minimizing noise. A sealing cover 120 is installed between the flip cover 110 and the middle shell 200, effectively sealing the gap between them and reducing the probability of debris entering the ventilation fan through this gap, thus increasing the ventilation fan's sealing performance.

[0057] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A screen quick release structure, characterized by, include: The lower shell inner frame (510) and the mesh assembly (520) are provided with an opening (511) on the lower shell inner frame (510), and the mesh assembly (520) covers the opening (511). The opening (511) side wall of the lower shell inner frame (510) is provided with a snap hole (5111). The mesh assembly (520) includes a mesh body (521) and a mesh outer frame (522). The mesh body (521) is fixedly disposed at the opening of the mesh outer frame (522). A latch (5221) is provided on one side of the mesh outer frame (522), and the latch (5221) is inserted into the latch hole (5111). A locking component (530) is provided on the side of the mesh outer frame (522) away from the latch (5221). The mesh outer frame (522) is connected to the lower shell inner frame (510) through the locking component (530). The cam portion (53011) is eccentrically positioned; The fastening pin (5302) has a stepped shaft structure and is located in the inner hole of the outer frame of the mesh (522); The spring (5304) is sleeved on the fastening pin (5302). One end of the spring (5304) abuts against the stepped shaft end face of the fastening pin (5302), and the other end abuts against the inner wall of the mesh frame (522) which has an inner hole.

2. The screen quick release structure according to claim 1, wherein: The lower inner frame (510) is provided with an insertion hole. The locking assembly (530) includes a rocker block (5301), a fastening pin (5302), a cylindrical pin (5303), and a spring (5304). The fastening pin (5302) is slidably disposed on the outer frame (522) of the mesh screen. The rocker block (5301) includes a cam part (53011) and a handle part (53012). The handle part (53012) is fixedly connected to the cam part (53011). The fastening pin (5304) is slidably disposed on the outer frame (522) of the mesh screen. One end of the spring (5302) is rotatably connected to the cam part (53011) via the cylindrical pin (5303). The outer peripheral surface of the cam part (53011) is in contact with the inner wall of the mesh frame (522). One end of the spring (5304) is connected to the fastening pin (5302), and the other end is connected to the mesh frame (522). The spring (5304) has a tendency to cause the fastening pin (5302) to extend outward. The fastening pin (5302) is pulled out of or inserted into the insertion hole.

3. A ventilating fan comprising: The assembly comprises an upper shell (100), a middle shell (200), a lower shell (500), and a fan assembly (400), wherein the middle shell (200) and the lower shell (500) are fixedly connected, one side of the upper shell (100) and one side of the middle shell (200) are rotatably connected, and the fan assembly (400) is fixedly mounted on the middle shell (200). The lower shell (500) is characterized by having a mesh quick-release structure as described in claim 1 or 2.

4. A recreational vehicle characterized by, It is equipped with the ventilation fan as described in claim 3.

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