Window clamping type ventilating fan

Abstract

The utility model relates to a window clamping type ventilating fan. The window clamping type ventilating fan comprises a front shell and a rear shell, the front shell is provided with a first ventilating opening, the rear shell is provided with a second ventilating opening, a first motor and fan blades are installed in the rear shell, and the second ventilating opening is provided with a check valve; the rear shell comprises a seat body and an air pipe; the check valve comprises a valve ring, a first valve plate, a second valve plate, a third valve plate and a synchronous rod, the first valve plate, the second valve plate and the third valve plate are rotatably mounted on the valve ring, and the synchronous rod is fixedly connected with the first valve plate, the second valve plate and the third valve plate; the first valve plate is provided with a receding groove matched with the edge of the valve ring, the synchronous rod is provided with a first limiting face for limiting the second valve plate and a second limiting face for limiting the third valve plate, a limiting block matched with the first valve plate is arranged on the inner edge of the valve ring, and when the first valve plate is closed, the valve ring limits the first valve plate through the limiting block. The check valve in the window clamping type ventilating fan is simple in structure, low in production cost and capable of meeting actual production requirements.

Description

Technical Field

[0001] This utility model relates to the field of ventilation fan technology, and in particular to a window-clamping ventilation fan. Background Technology

[0002] An exhaust fan is an air conditioning appliance that uses an electric motor to drive the fan blades to rotate and create airflow, exchanging indoor and outdoor air. Its main functions are to remove stale indoor air, regulate temperature and humidity, and maintain fresh indoor air. Exhaust fans are widely used in homes and public places, especially in kitchens and bathrooms where ventilation is essential.

[0003] To prevent outdoor rainwater, smoke, and other pollutants from flowing back into the room through the ventilation fan, a check valve is usually installed on the fan. However, the check valve structure for ventilation fans is complex and has a high production cost. Utility Model Content

[0004] Therefore, it is necessary to provide a clamp-type ventilation fan to address the problems of complex check valve structure and high production cost in related technologies.

[0005] A window-mounted ventilation fan includes a front shell and a rear shell connected to the front shell. The front shell is provided with a first ventilation port, and the rear shell is provided with a second ventilation port. A first motor and fan blades are installed inside the rear shell, and a check valve is installed in the second ventilation port.

[0006] The first motor is used to drive the fan blades to rotate, so that indoor air is discharged from the first ventilation port to the outside through the second ventilation port, and the check valve is used to prevent outdoor air from entering the room from the second ventilation port through the first ventilation port.

[0007] The rear shell includes a base and an air duct connected to the base. The base is used to cooperate with the front shell, and the air duct is used to cooperate with the installation of the window-type ventilation fan.

[0008] The check valve includes a valve ring, a first valve plate, a second valve plate, a third valve plate, and a synchronizing rod. The first valve plate, the second valve plate, and the third valve plate can all be rotatably mounted on the valve ring. The synchronizing rod is fixedly connected to the first valve plate, the second valve plate, and the third valve plate respectively.

[0009] The first valve plate is positioned above the second valve plate, and the second valve plate is positioned above the third valve plate. The first valve plate has a clearance groove that mates with the edge of the valve ring. The synchronizing rod has a first limiting surface for limiting the second valve plate and a second limiting surface for limiting the third valve plate. The inner edge of the valve ring has a limiting block that mates with the first valve plate, the second valve plate, and the third valve plate. The limiting block is used to limit the first valve plate, the second valve plate, and the third valve plate.

[0010] After installation, the aforementioned window-mounted ventilation fan has its front casing located indoors, and the duct extends outdoors through mounting holes in the wall. When the window-mounted ventilation fan is operating, the first motor drives the fan blades to rotate, allowing indoor air to exit through the first and second ventilation ports. As the indoor air exits through the second ventilation port, it exerts a thrust on the first, second, and third valve plates, causing them to rotate relative to the valve ring, thus opening the check valve. Because the synchronizing rod is fixedly connected to the first, second, and third valve plates, they can rotate synchronously relative to the valve ring. The synchronizing rod, through the first and second limiting surfaces, can limit the second and third valve plates, thereby controlling their opening angles. Since the first, second, and third valve plates rotate synchronously via the synchronizing rod, the opening angle of the first valve plate can be controlled simultaneously. When the window-mounted ventilation fan is not working, the first motor is de-energized and no longer drives the fan blades. The first, second, and third valve plates are no longer subjected to the thrust of indoor air and reset due to gravity. When the first valve plate resets to its initial position, the valve ring limits its position via a limiting block. Since the first, second, and third valve plates rotate synchronously via a synchronizing rod, they can be simultaneously limited. When outdoor air exerts a thrust on the first, second, and third valve plates, the limiting block prevents them from tilting inwards, thus preventing outdoor air or rainwater from entering the room and protecting the indoor environment. It can be seen that the check valve structure of this window-mounted ventilation fan is simple, has low production costs, and can precisely control the opening and closing of the first, second, and third valve plates, thereby preventing outdoor air or rainwater from entering the room and protecting the indoor environment.

[0011] In one embodiment, the first valve plate is provided with a first positioning post, a second positioning post and a first mounting hole, the second valve plate is provided with a third positioning post, a fourth positioning post and a second mounting hole, and the third valve plate is provided with a fifth positioning post, a sixth positioning post and a third mounting hole;

[0012] The valve ring is provided with first positioning holes, second positioning holes, third positioning holes, fourth positioning holes, fifth positioning holes and sixth positioning holes respectively to cooperate with the first positioning post, the second positioning post, the third positioning post, the fourth positioning post, the fifth positioning post and the sixth positioning post. The first positioning hole, the third positioning hole and the fifth positioning hole are located on one side of the valve ring, and the second positioning hole, the fourth positioning hole and the sixth positioning hole are located on the other side of the valve ring.

[0013] The synchronizing rod is provided with a first protrusion, a second protrusion, and a third protrusion that mate with the first mounting hole, the second mounting hole, and the third mounting hole, respectively.

[0014] In one embodiment, the valve ring is provided with a first locking block, a second locking block, a third locking block and a fourth locking block, and the air duct is provided with a first locking groove, a second locking groove, a third locking groove and a fourth locking groove respectively to cooperate with the first locking block, the second locking block, the third locking block and the fourth locking block.

[0015] In one embodiment, a motor mount is provided inside the duct, and a first support rod, a second support rod, a third support rod and a fourth support rod are provided between the motor mount and the inner wall of the duct. The motor mount is used to install the first motor.

[0016] In one embodiment, a louver mounting groove is provided on one side of the front shell, and a plurality of rotatable louvers are arranged in parallel in the louver mounting groove. A guide rod is provided on the other side of the front shell, and each louver is connected to the guide rod.

[0017] A second motor is mounted on the base, and the output shaft of the second motor is connected to the guide rod. The second motor is used to drive the guide rod to reciprocate in the vertical direction, and the guide rod is used to drive the louvers to open and close through the reciprocating motion in the vertical direction.

[0018] In one embodiment, the louver is provided with a first rotating shaft, a second rotating shaft and a transmission shaft, the first rotating shaft being located on one side of the louver, and the second rotating shaft and the transmission shaft being located on the other side of the louver;

[0019] The louvers are connected to the front shell via the first rotating shaft and the second rotating shaft, and are connected to the guide rod via the transmission shaft. The first rotating shaft and the second rotating shaft are symmetrically arranged along the louvers.

[0020] In one embodiment, the guide rod is provided with a hanging ring that engages with the output shaft of the second motor and a shaft hole that engages with the transmission shaft.

[0021] In one embodiment, the seat body has a cavity on the side facing the front shell, and the second motor is disposed inside the cavity;

[0022] The cavity is also equipped with a control circuit board, and the first motor and the second motor are electrically connected to the control circuit board. The control circuit board is used to control the first motor and the second motor.

[0023] In one embodiment, when the first motor is not working, the lower edge of the first valve plate abuts against the upper edge of the second valve plate, and the lower edge of the second valve plate abuts against the upper edge of the third valve plate.

[0024] In one embodiment, both the front shell and the base are square. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the working structure of the window-clamping ventilation fan of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the window-mounted ventilation fan of this utility model when it is not in operation;

[0027] Figure 3 This is a schematic diagram of the front shell of the window-type ventilation fan of this utility model;

[0028] Figure 4 This is a schematic diagram of the louvers in the window-type ventilation fan of this utility model;

[0029] Figure 5 This is a schematic diagram of the cooperation structure between the louvers and the guide rod in the window-type ventilation fan of this utility model;

[0030] Figure 6 This is a schematic diagram of the valve ring structure in the window-type ventilation fan of this utility model;

[0031] Figure 7 This is a schematic diagram of the cooperation structure between the synchronizing rod and the valve plate in the window-type ventilation fan of this utility model;

[0032] Figure 8 This is an exploded structural diagram of the window-type ventilation fan of this utility model;

[0033] Figure 9 This is a schematic diagram of the rear shell of the window-type ventilation fan of this utility model;

[0034] Figure 10 This is another structural schematic diagram of the rear shell of the window-type ventilation fan of this utility model;

[0035] Figure 11 This is another structural schematic diagram of the window-mounted ventilation fan of this utility model when it is not in operation;

[0036] Figure 12This is another structural schematic diagram of the window-clamping ventilation fan of this utility model during operation;

[0037] Figure 13 This is a schematic diagram of the synchronizing rod in the window-type ventilation fan of this utility model;

[0038] Figure 14 This is another structural schematic diagram of the front shell of the window-type ventilation fan of this utility model;

[0039] Figure 15 This is a partial structural schematic diagram of the window-clamping ventilation fan of this utility model;

[0040] Among them, 10 is the front shell, 20 is the rear shell, 30 is the first motor, 40 is the fan blade, 50 is the backstop valve, 60 is the second motor, 61 is the stepper motor guide bracket, 70 is the mating ring, 11 is the louver mounting slot, 12 is the louver, 121 is the first rotating shaft, 122 is the second rotating shaft, 123 is the transmission shaft, 13 is the guide rod, 131 is the hanging ring, 132 is the shaft hole, 14 is the first slot, 15 is the second slot, 21 is the base, and 211 is the shape. Cavity, 212 is a wire harness slot, 22 is an air duct, 221 is a first slot, 222 is a second slot, 223 is a third slot, 224 is a fourth slot, 225 is a motor mount, 226 is a first support rod, 227 is a second support rod, 228 is a third support rod, 229 is a fourth support rod, 230 is a groove, 51 is a valve ring, 510 is a limiting block, 5101 is a first limiting block, 5102 is a second limiting block, and 5103 is a third limiting block. 511 is the first positioning hole, 512 is the second positioning hole, 513 is the third positioning hole, 514 is the fourth positioning hole, 515 is the fifth positioning hole, 516 is the sixth positioning hole, 517 is the first locking block, 518 is the second locking block, 519 is the third locking block, 520 is the fourth locking block, 52 is the first valve plate, 521 is the first positioning post, 522 is the second positioning post, 523 is the first mounting hole, 524 is the clearance groove, 53 is the second valve plate, 53 1 is the third positioning post, 532 is the fourth positioning post, 533 is the second mounting hole, 54 is the third valve plate, 541 is the fifth positioning post, 542 is the sixth positioning post, 543 is the third mounting hole, 55 is the synchronizing rod, 551 is the first protrusion, 552 is the second protrusion, 553 is the third protrusion, 554 is the first limiting surface, 555 is the second limiting surface, 56 is the protrusion, 71 is the pressure line part, 72 is the connecting part, 73 is the limiting part, and 74 is the pipe part. Detailed Implementation

[0041] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0042] It should be noted that when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] This utility model discloses a window-mounted ventilation fan.

[0045] like Figures 1 to 15As shown, the window-clamping ventilation fan includes a front shell 10 and a rear shell 20 connected to the front shell 10. The front shell 10 has a first ventilation port, and the rear shell 20 has a second ventilation port. A first motor 30 and a fan blade 40 are installed inside the rear shell 20, and a check valve 50 is installed in the second ventilation port. The first motor 30 drives the fan blade 40 to rotate, so that indoor air is discharged to the outside from the first ventilation port through the second ventilation port. The check valve 50 prevents outdoor air from entering the room from the second ventilation port through the first ventilation port. The rear shell 20 includes a base 21 and a duct 22 connected to the base 21. The base 21 is used to cooperate with the front shell 10, and the duct 22 is used to cooperate with the installation of the window-clamping ventilation fan. The check valve 50 includes a valve ring 51, a first valve plate 52, a second valve plate 53, a third valve plate 54, and a synchronizing rod 55. The first valve plate 52, the second valve plate 53, and the third valve plate 54 can all be rotatably mounted on the valve ring 51. The synchronizing rod 55 is fixedly connected to the first valve plate 52, the second valve plate 53, and the third valve plate 54 respectively. The first valve plate 52 is located above the second valve plate 53, and the second valve plate 53 is located above the third valve plate 54. The first valve plate 52 is provided with a clearance groove 524 that matches the edge of the valve ring 51. The synchronizing rod 55 is provided with a first limiting surface 554 that limits the second valve plate 53 and a second limiting surface 555 that limits the third valve plate 54 respectively. The inner edge of the valve ring 51 is provided with a limiting block 510 that matches the first valve plate 52, the second valve plate 53, and the third valve plate 54. The limiting block 510 is used to limit the first valve plate 52, the second valve plate 53, and the third valve plate 54.

[0046] After installation, the aforementioned window-mounted ventilation fan has its front casing located indoors, and the duct extends outdoors through mounting holes in the wall. When the window-mounted ventilation fan is operating, the first motor drives the fan blades to rotate, allowing indoor air to exit through the first and second ventilation ports. As the indoor air exits through the second ventilation port, it exerts a thrust on the first, second, and third valve plates, causing them to rotate relative to the valve ring, thus opening the check valve. Because the synchronizing rod is fixedly connected to the first, second, and third valve plates, they can rotate synchronously relative to the valve ring. The synchronizing rod, through the first and second limiting surfaces, can limit the second and third valve plates, thereby controlling their opening angles. Since the first, second, and third valve plates rotate synchronously via the synchronizing rod, the opening angle of the first valve plate can be controlled simultaneously. When the window-mounted ventilation fan is not working, the first motor is de-energized and no longer drives the fan blades. The first, second, and third valve plates are no longer subjected to the thrust of indoor air and reset due to gravity. When the first valve plate resets to its initial position, the valve ring limits its position via a limiting block. Since the first, second, and third valve plates rotate synchronously via a synchronizing rod, they can be simultaneously limited. When outdoor air exerts a thrust on the first, second, and third valve plates, the limiting block prevents them from tilting inwards, thus preventing outdoor air or rainwater from entering the room and protecting the indoor environment. It can be seen that the check valve structure of this window-mounted ventilation fan is simple, has low production costs, and can precisely control the opening and closing of the first, second, and third valve plates, thereby preventing outdoor air or rainwater from entering the room and protecting the indoor environment.

[0047] Furthermore, the limiting block 510 includes a first limiting block 5101, a second limiting block 5102, and a third limiting block 5103. The first limiting block 5101 is used to limit the first valve plate 52, the second limiting block 5102 is used to limit the second valve plate 53, and the third limiting block 5103 is used to limit the third valve plate 54. Through the cooperation of the first limiting block 5101, the second limiting block 5102, and the third limiting block 5103, the sealing performance of the second air exchange port is higher when the first valve plate 52, the second valve plate 53, and the third valve plate 54 are closed.

[0048] The first valve plate 52 is provided with a first positioning post 521, a second positioning post 522 and a first mounting hole 523; the second valve plate 53 is provided with a third positioning post 531, a fourth positioning post 532 and a second mounting hole 533; and the third valve plate 54 is provided with a fifth positioning post 541, a sixth positioning post 542 and a third mounting hole 543. The valve ring 51 is provided with first positioning holes 511 that mate with the first positioning post 521, the second positioning post 522, the third positioning post 531, the fourth positioning post 532, the fifth positioning post 541 and the sixth positioning post 542. The valve ring 51 has a second positioning hole 512, a third positioning hole 513, a fourth positioning hole 514, a fifth positioning hole 515, and a sixth positioning hole 516. The first positioning hole 511, the third positioning hole 513, and the fifth positioning hole 515 are located on one side of the valve ring 51, and the second positioning hole 512, the fourth positioning hole 514, and the sixth positioning hole 516 are located on the other side of the valve ring 51. The synchronizing rod 55 is provided with a first protrusion 551, a second protrusion 552, and a third protrusion 553 that mate with the first mounting hole 523, the second mounting hole 533, and the third mounting hole 543, respectively.

[0049] By engaging the first protrusion 551, the second protrusion 552, and the third protrusion 553 with the first mounting hole 523, the second mounting hole 533, and the third mounting hole 543 respectively, the synchronizing rod 55 can be fixedly connected to the first valve plate 52, the second valve plate 53, and the third valve plate 54 respectively, thereby enabling the first valve plate 52, the second valve plate 53, and the third valve plate 54 to rotate synchronously.

[0050] The valve ring 51 is provided with a first locking block 517, a second locking block 518, a third locking block 519 and a fourth locking block 520, and the air duct 22 is provided with a first locking groove 221, a second locking groove 222, a third locking groove 223 and a fourth locking groove 224 respectively to cooperate with the first locking block 517, the second locking block 518, the third locking block 519 and the fourth locking block 520.

[0051] By engaging the first slot 221, the second slot 222, the third slot 223, and the fourth slot 224 with the first block 517, the second block 518, the third block 519, and the fourth block 520 respectively, the valve ring 51 is fixedly connected to the air duct 22, thereby improving the stability of the check valve 50.

[0052] The air duct 22 is equipped with a motor base 225 inside. A first support rod 226, a second support rod 227, a third support rod 228 and a fourth support rod 229 are provided between the motor base 225 and the inner wall of the air duct 22. The motor base 225 is used to install the first motor 30.

[0053] By setting the motor mount 225, the installation of the first motor 30 is made more stable, and the motor mount 225 is made more secure by the first support rod 226, the second support rod 227, the third support rod 228 and the fourth support rod 229.

[0054] The front shell 10 has a louver mounting groove 11 on one side, and multiple rotatable louvers 12 are arranged in parallel in the louver mounting groove 11. The front shell 10 has a guide rod 13 on the other side, and each louver 12 is connected to the guide rod 13. A second motor 60 is installed on the base 21. The output shaft of the second motor 60 is connected to the guide rod 13 through a stepper motor guide bracket 61. The second motor 60 is used to drive the guide rod 13 to reciprocate in the vertical direction. The guide rod 13 is used to drive the louvers 12 to open and close through the reciprocating motion in the vertical direction.

[0055] When the window-mounted ventilation fan is working, the second motor 60 drives the guide rod 13 to control the louvers 12 to open, so that indoor air can be smoothly discharged to the outside from the first ventilation port through the second ventilation port; when the window-mounted ventilation fan is not working, the second motor 60 drives the guide rod 13 to control the louvers 12 to close, which can prevent indoor dust and oil stains from entering the air duct 22 from the first ventilation port, thus protecting the first motor 30 and the second motor 60.

[0056] The louver 12 is provided with a first rotating shaft 121, a second rotating shaft 122 and a transmission shaft 123. The first rotating shaft 121 is located on one side of the louver 12, and the second rotating shaft 122 and the transmission shaft 123 are located on the other side of the louver 12. The louver 12 is connected to the front shell 10 through the first rotating shaft 121 and the second rotating shaft 122, and connected to the guide rod 13 through the transmission shaft 123. The first rotating shaft 121 and the second rotating shaft 122 are symmetrically arranged along the louver 12.

[0057] By setting the transmission shaft 123, the guide rod 13 can apply force to the louver 12 through the transmission shaft 123, and the louver 12 can then rotate through the first rotating shaft 121 and the second rotating shaft 122, thereby realizing the opening and closing of the louver 12.

[0058] Furthermore, the front housing 10 is provided with a first slot 14 that engages with the second rotating shaft 122 and a second slot 15 that engages with the transmission shaft 123. The second slot 15 is an elongated arc-shaped hole. During the opening and closing of the louvers 12, the transmission shaft 123 reciprocates inside the second slot 15, and the second slot 15 can limit the movement of the transmission shaft 123. Through the mutual engagement of the first slot 14 and the second slot 15, the second motor 60 can control the opening and closing of the louvers 12 through the drive guide rod 13.

[0059] The guide rod 13 is provided with a hanging ring 131 that cooperates with the output shaft of the second motor 60 and a shaft hole 132 that cooperates with the transmission shaft 123.

[0060] By providing the hanging ring 131, the hanging ring 131 can easily apply force to the louver 12 by engaging with the output shaft of the second motor 60. By providing the shaft hole 132, the installation of the drive shaft 123 can be facilitated.

[0061] The base 21 has a cavity 211 on the side facing the front shell 10, and the second motor 60 is located inside the cavity 211. A control circuit board is also located inside the cavity 211. The first motor 30 and the second motor 60 are electrically connected to the control circuit board, which controls the first motor 30 and the second motor 60. By placing the second motor 60 and the control circuit board inside the cavity 211, they can be protected from damage.

[0062] When the first motor 30 is not working, the lower edge of the first valve plate 52 abuts against the upper edge of the second valve plate 53, and the lower edge of the second valve plate 53 abuts against the upper edge of the third valve plate 54.

[0063] When the first motor 30 is not working, the lower edge of the first valve plate 52 abuts against the upper edge of the second valve plate 53, and the lower edge of the second valve plate 53 abuts against the upper edge of the third valve plate 54, so that the second ventilation port has good sealing performance, thereby better preventing outdoor air or outdoor rainwater from entering the room.

[0064] The shapes of the front shell 10 and the base 21 can be set according to actual needs. Preferably, both the front shell 10 and the base 21 are square.

[0065] Furthermore, the duct 22 is provided with a groove 230, which is located on the upper edge of the duct 22. The valve ring 51 is provided with a protrusion 56 that matches the groove 230. By providing the groove 230 and the protrusion 56, after the window-type ventilation fan is assembled and installed, the first valve plate 52 is located above the second valve plate 53, and the second valve plate 53 is located above the third valve plate 54. This allows the check valve 50 to prevent outdoor air from entering the room through the first ventilation port from the second ventilation port, thus avoiding the check valve 50 failing to isolate outdoor air if the first valve plate 52 is installed downwards.

[0066] Furthermore, a mating ring 70 is connected to the side of the duct 22 facing the front housing 10, and the base 21 is provided with a wiring harness groove 212 for accommodating the power supply wiring harness of the first motor 30. The mating ring 70 has a wire pressing part 71, a connecting part 72, a limiting part 73, and a pipe part 74. The mating ring 70 is used to press the power supply wiring harness of the first motor 30 into the wiring harness groove 212 through the wire pressing part 71, connects to the base 21 through the connecting part 72, presses against the end of the adjusting screw of the window-type ventilation fan through the limiting part 73 to prevent the adjusting screw from coming out, and connects to the end of the duct 22 through the pipe part 74. By setting the mating ring 70, indoor air can be introduced into the duct 22 from the first ventilation port and discharged to the outside through the second ventilation port, which helps to improve the ventilation effect.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A window-mounted ventilation fan, characterized in that, The device includes a front housing and a rear housing connected to the front housing. The front housing is provided with a first ventilation port, and the rear housing is provided with a second ventilation port. A first motor and a fan blade are installed inside the rear housing, and a check valve is installed in the second ventilation port. The first motor is used to drive the fan blades to rotate, so that indoor air is discharged from the first ventilation port to the outside through the second ventilation port, and the check valve is used to prevent outdoor air from entering the room from the second ventilation port through the first ventilation port. The rear housing includes a base and an air duct connected to the base. The base is used to cooperate with the front housing, and the air duct is used to cooperate with the installation of the window-type ventilation fan. The check valve includes a valve ring, a first valve plate, a second valve plate, a third valve plate, and a synchronizing rod. The first valve plate, the second valve plate, and the third valve plate can all be rotatably mounted on the valve ring. The synchronizing rod is fixedly connected to the first valve plate, the second valve plate, and the third valve plate respectively. The first valve plate is positioned above the second valve plate, and the second valve plate is positioned above the third valve plate. The first valve plate has a clearance groove that mates with the edge of the valve ring. The synchronizing rod has a first limiting surface for limiting the second valve plate and a second limiting surface for limiting the third valve plate. The inner edge of the valve ring has a limiting block that mates with the first valve plate, the second valve plate, and the third valve plate. The limiting block is used to limit the first valve plate, the second valve plate, and the third valve plate.

2. The window-mounted ventilation fan according to claim 1, characterized in that, The first valve plate is provided with a first positioning post, a second positioning post and a first mounting hole; the second valve plate is provided with a third positioning post, a fourth positioning post and a second mounting hole; and the third valve plate is provided with a fifth positioning post, a sixth positioning post and a third mounting hole. The valve ring is provided with first positioning holes, second positioning holes, third positioning holes, fourth positioning holes, fifth positioning holes and sixth positioning holes respectively to cooperate with the first positioning post, the second positioning post, the third positioning post, the fourth positioning post, the fifth positioning post and the sixth positioning post. The first positioning hole, the third positioning hole and the fifth positioning hole are located on one side of the valve ring, and the second positioning hole, the fourth positioning hole and the sixth positioning hole are located on the other side of the valve ring. The synchronizing rod is provided with a first protrusion, a second protrusion, and a third protrusion that mate with the first mounting hole, the second mounting hole, and the third mounting hole, respectively.

3. The window-mounted ventilation fan according to claim 2, characterized in that, The valve ring is provided with a first locking block, a second locking block, a third locking block and a fourth locking block, and the air duct is provided with a first locking groove, a second locking groove, a third locking groove and a fourth locking groove respectively to cooperate with the first locking block, the second locking block, the third locking block and the fourth locking block.

4. The window-mounted ventilation fan according to any one of claims 1 to 3, characterized in that, The air duct is equipped with a motor mount, and a first support rod, a second support rod, a third support rod and a fourth support rod are provided between the motor mount and the inner wall of the air duct. The motor mount is used to install the first motor.

5. The window-mounted ventilation fan according to claim 4, characterized in that, The front shell has a louver mounting groove on one side, and multiple rotatable louvers are arranged in parallel in the louver mounting groove. The front shell has a guide rod on the other side, and each louver is connected to the guide rod. A second motor is mounted on the base, and the output shaft of the second motor is connected to the guide rod. The second motor is used to drive the guide rod to reciprocate in the vertical direction, and the guide rod is used to drive the louvers to open and close through the reciprocating motion in the vertical direction.

6. The window-mounted ventilation fan according to claim 5, characterized in that, The louver is provided with a first rotating shaft, a second rotating shaft and a transmission shaft. The first rotating shaft is located on one side of the louver, and the second rotating shaft and the transmission shaft are located on the other side of the louver. The louvers are connected to the front shell via the first rotating shaft and the second rotating shaft, and are connected to the guide rod via the transmission shaft. The first rotating shaft and the second rotating shaft are symmetrically arranged along the louvers.

7. The window-mounted ventilation fan according to claim 6, characterized in that, The guide rod is provided with a hanging ring that cooperates with the output shaft of the second motor and a shaft hole that cooperates with the transmission shaft.

8. The window-mounted ventilation fan according to claim 7, characterized in that, The base body has a cavity on the side facing the front shell, and the second motor is located inside the cavity; The cavity is also equipped with a control circuit board, and the first motor and the second motor are electrically connected to the control circuit board. The control circuit board is used to control the first motor and the second motor.

9. The window-mounted ventilation fan according to claim 1, characterized in that, When the first motor is not working, the lower edge of the first valve plate abuts against the upper edge of the second valve plate, and the lower edge of the second valve plate abuts against the upper edge of the third valve plate.

10. The window-mounted ventilation fan according to claim 1, characterized in that, Both the front shell and the base are square.

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