Exhaust fan

Abstract

The utility model discloses an exhaust fan, which belongs to the technical field of air circulation and comprises a shell and a fan mechanism, the shell is provided with an inner shell and an outer shell, an air inlet and outlet channel is formed in the inner shell, the outer shell is sleeved outside the inner shell, an air inlet is formed between the outer shell and the inner shell, and the outer shell is provided with an exhaust port opposite to the air inlet and outlet channel. The air inlet and outlet channel, the air inlet and the exhaust port are communicated with one another; the fan blade assembly sucks air of the air inlet and outlet channel, the fan blade assembly enables the air to be exhausted from the exhaust port in the rotating process, and indoor and outdoor circulation of air is achieved. When the adjusting assembly is adopted to adjust the angle of the fan blade assembly outside the driving shaft, along with the change of the angle of the fan blade assembly, the fan blade assembly sucks air of the air inlet, in the rotating process of the fan blade assembly, the air enters the shell and is exhausted from the air inlet and outlet channel, the air is prevented from being exhausted from the exhaust port, and indoor circulation of air is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air circulation, and particularly relates to an exhaust fan. Background Art

[0002] An exhaust fan is a commonly used ventilation device in daily life. The exhaust fan has a housing, a motor, and a fan blade. The housing has an air inlet and an exhaust outlet. Usually, the air inlet faces the indoor, and the exhaust outlet faces the outdoor. The motor is used to drive the fan blade to discharge the indoor waste gas to the outdoor.

[0003] However, the main function of the exhaust fan is to discharge the indoor air to the outdoor. In many occasions, there is not enough fresh air exchange opportunity between the room and the outside. In order to keep the indoor air fresh, usually an expensive air purifier needs to be configured. After discharging the indoor waste gas, the air purifier is used to circulate the indoor air. If the indoor external circulation and internal circulation need to be realized, an air purifier and an exhaust fan must be used. Therefore, the existing exhaust fan cannot realize the internal circulation of air. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an exhaust fan, which realizes the indoor external circulation and internal circulation.

[0005] The technical solution is as follows:

[0006] An exhaust fan, comprising:

[0007] A housing, the housing has an inner housing and an outer housing. An air inlet and outlet channel is formed inside the inner housing. The outer housing is sleeved outside the inner housing, and an air inlet is formed between the outer housing and the inner housing. The outer housing has an exhaust outlet opposite to the air inlet and outlet channel. The air inlet and outlet channel, the air inlet, and the exhaust outlet are interconnected;

[0008] A fan mechanism, the fan mechanism includes an adjustment component, a fan blade component, a first driving member, and a driving shaft. The first driving member is installed on the housing. The driving shaft is installed on the output end of the first driving member. The fan blade component is rotatably installed on the driving shaft. The first end of the adjustment component is installed on the housing, and the second end of the adjustment component is installed on the fan blade component;

[0009] The adjustment component is used to adjust the angle of the fan blade component so that the fan blade component has a first air outlet mode and a second air outlet mode. In the first air outlet mode, the air outlet direction of the fan blade component faces the exhaust outlet. In the second air outlet mode, the air outlet direction of the fan blade component faces the air inlet and outlet channel.

[0010] In one embodiment, the adjusting assembly includes a second driving member, a lead screw, a pushing member, and a sliding member. The second driving member is installed on the housing and is disposed opposite to the first driving member. The lead screw is installed on the second driving member. The sliding member is sleeved outside the lead screw and is in threaded cooperation with the lead screw. The sliding member abuts against the first end of the pushing member, and the second end of the pushing member is installed on the fan blade assembly.

[0011] The second driving member is used to rotate clockwise or counterclockwise so that the pushing member has a first moving position and a second moving position in the axial direction of the lead screw. In the first moving position, the fan blade assembly is in a first air outlet mode, and in the second moving position, the fan blade assembly is in a second air outlet mode.

[0012] In one embodiment, the pushing member includes a connecting block and a connecting plate. The sliding member has a receiving groove, and the cross-section of the receiving groove is in a T shape. The connecting block is sleeved outside the lead screw, and at least part of the connecting block is located in the receiving groove and abuts against the sliding member. The connecting block is installed at the first end of the connecting plate, and the second end of the connecting plate is hinged to the outer wall of the fan blade assembly.

[0013] In one embodiment, the length direction of the fan blade assembly intersects with the length direction of the driving shaft. The fan blade assembly includes blades, connecting arms, and sliding shafts. The connecting arms are installed on the blades, and the sliding shafts are installed on the connecting arms. The connecting plate has a guide groove, and the length direction of the guide groove intersects with the axial direction of the lead screw. At least part of the sliding shaft is located in the guide groove and is in rotational cooperation with the connecting plate.

[0014] In one embodiment, the fan blade assembly further has a connecting shaft. The connecting shaft is arranged along the length direction of the fan blade assembly. The first end of the connecting shaft is installed at the end of the blade, and the second end of the connecting shaft is movably installed on the outer wall of the driving shaft. The connecting arm is installed on the outer wall of the connecting shaft, and the length direction of the connecting arm intersects with the length direction of the connecting shaft.

[0015] In one embodiment, the connecting plate has a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are of an integral structure, and both the first connecting portion and the second connecting portion have the guide groove. An activity groove is formed between the first connecting portion and the second connecting portion, and the length direction of the activity groove intersects with the length direction of the guide groove. At least part of the connecting arm is located in the activity groove.

[0016] In one embodiment, both the outer shell and the inner shell are in a hollow barrel-like structure. The inner diameter of the outer shell is larger than the inner diameter of the inner shell, and the fan blade assembly is located in the inner shell.

[0017] The housing further has a first cover plate and a second cover plate. The front end of the inner housing or the outer housing is mounted on the first cover plate, and the rear end of the outer housing is mounted on the second cover plate. An air duct is formed between the inner housing and the outer housing, and both ends of the air duct communicate with the air inlet and the exhaust port respectively.

[0018] In one embodiment, the exhaust fan further has an ion generator and a negative ion electrode. The ion generator is mounted on the second cover plate, and the negative ion electrode is mounted on the first cover plate and located at the air inlet and outlet channel; the negative ion electrode is electrically connected to the ion generator.

[0019] In one embodiment, the housing further has a sealing plate. The first end of the sealing plate is mounted on the second cover plate and is hinged to the top of the second cover plate; the second end of the sealing plate abuts against the bottom of the second cover plate, and the sealing plate covers the exhaust port.

[0020] The technical solution provided by the present utility model has the following advantages and effects:

[0021] 1. The first driving member drives the driving shaft to rotate, thereby driving the fan blade assembly to rotate. The shape and angle design of the fan blade assembly cause the air to be pushed and form an air flow. At the same time, the fan blade assembly also utilizes the pressure difference of the air to generate wind; since the fan blade assembly is rotatably mounted on the driving shaft, the angle of the fan blade assembly is adjusted by the adjusting assembly. When the included angle between the fan blade assembly and the vertical plane is a positive number, the fan blade assembly is in the first air outlet mode, and the air outlet direction of the fan blade assembly faces the exhaust port. When the included angle between the fan blade assembly and the vertical plane is a negative number, the fan blade assembly is in the second air outlet mode, and the air outlet direction of the fan blade assembly faces the air inlet and outlet channel. The exhaust fan is installed on the outer wall of the building, with the air inlet and outlet channel and the air inlet facing the interior of the room, and the exhaust port facing the exterior of the room; when in use, when the exhaust fan is in the indoor-outdoor circulation mode, the angle of the fan blade assembly is limited by the adjusting assembly so that the included angle between the fan blade assembly and the vertical plane is a positive number. The fan blade assembly sucks the gas in the air inlet and outlet channel, and the gas is discharged from the exhaust port during the rotation of the fan blade assembly, realizing the indoor-outdoor circulation of the air. By adjusting the angle of the fan blade assembly through the adjusting assembly, the included angle between the fan blade assembly and the vertical plane is a negative number. As the angle of the fan blade assembly changes, the fan blade assembly sucks the gas at the air inlet. During the rotation of the fan blade assembly, the gas enters the housing and is discharged from the air inlet and outlet channel, preventing the gas from being discharged from the exhaust port and realizing the indoor circulation of the air.

[0022] 2. Install the second driving member on the housing. By starting the second driving member, the lead screw is driven to rotate. The sliding member is sleeved outside the lead screw and is in threaded cooperation with the lead screw. When the lead screw drives the sliding member to rotate, since the first end of the pushing member abuts against the sliding member, the pushing member is used to limit the rotation of the sliding member. At the same time, the sliding member is used to drive the pushing member to move. The centripetal force generated by the lead screw is converted into a force for driving the sliding member to move back and forth through the threaded cooperation, so that the sliding member drives the pushing member to move back and forth. The pushing member is installed on the fan blade assembly. The pushing member adjusts the angle of the fan blade assembly during the movement. When the pushing member is in the first moving position, the fan blade assembly is in the first air outlet mode. When the pushing member is in the second moving position, the fan blade assembly is in the second air outlet mode; thus, it is further realized that a single exhaust fan can meet the indoor external circulation and internal circulation.

[0023] 3. By making at least part of the connecting block located in the receiving groove so that the connecting block abuts against the sliding member, the connecting block is realized to limit the rotation of the sliding member. At the same time, the sliding member drives the connecting block to move when moving. By the cooperation of the sliding member and the connecting block, the way of the lead screw transmitting power is changed; moreover, the connecting block is installed at the first end of the connecting plate, and the second end of the connecting plate is hinged to the outer wall of the fan blade assembly. When the connecting plate moves, it drives the fan blade assembly to rotate, thereby adjusting the tilt angle of the fan blade assembly.

[0024] 4. In order to make it easier for the connecting plate to drive the fan blade assembly to rotate when moving, the connecting arm is installed on the blade, the sliding shaft is installed on the connecting arm, the sliding shaft is located in the guide groove, and as the connecting plate moves, the sliding shaft moves in the guide groove. The length direction of the guide groove intersects with the axial line direction of the lead screw, so that when the connecting plate moves back and forth, the sliding shaft slides from one end of the guide groove to the other end; in use, the connecting plate is driven by the connecting block to move towards the front end of the housing, the sliding shaft moves in the guide groove, thereby driving the connecting arm to rotate, thereby adjusting the angle of the blade; the connecting plate, the sliding shaft and the connecting arm form a lever structure. As the sliding shaft rotates, it drives the connecting arm to rotate, making it easier for the connecting plate to drive the fan blade assembly to rotate when moving.

[0025] 5. The blade is installed on the outer wall of the driving shaft through the connecting shaft and is in rotational cooperation with the driving shaft, improving the stability of the cooperation between the blade and the driving shaft, so that the driving shaft drives the blade to rotate; the blade is also fixed to the connecting arm through the connecting shaft, improving the structural compactness between the blade and the pushing member, and at the same time facilitating the connecting arm to drive the blade to rotate through the connecting shaft and adjusting the angle of the blade.

[0026] 6. To improve the stability of the rotational fit between the sliding shaft and the connecting plate, the connecting plate has a first connecting portion and a second connecting portion, and both the first connecting portion and the second connecting portion have guide grooves, increasing the connection points between the sliding shaft and the connecting plate and improving the stability of the rotational fit between the sliding shaft and the connecting plate. At the same time, at least part of the connecting arm is located in the moving groove, preventing the connecting arm from being restricted by the connecting plate during rotation, thereby improving the flexibility of the connecting arm. When the connecting plate moves away from the front end of the housing, the connecting arm rotates around the connecting shaft and drives the sliding shaft to move in the guide groove. The sliding shaft moves from the bottom of the guide groove to the top of the guide groove. When the connecting arm rotates to a certain angle, the sliding shaft moves from the top of the guide groove to the bottom of the guide groove, further realizing the angle adjustment of the blade and enabling the fan blade assembly to have a first air outlet mode and a second air outlet mode.

[0027] 7. Both the outer housing and the inner housing are hollow cylindrical structures, and the inner diameter of the outer housing is greater than that of the inner housing. The fan blade assembly is located in the inner housing, improving the compactness between the fan blade assembly and the housing. At the same time, when the fan blade assembly rotates, the rotation range of the fan blade assembly mostly coincides with the air inlet and outlet channels of the inner housing, and the wind generated by the fan blade assembly acts completely on the air inlet and outlet channels, making the air flow in the air inlet and outlet channels more concentrated and stable. Moreover, the inner housing or the outer housing is installed on the first cover plate, and the outer housing is installed on the second cover plate, improving the sealing performance of the housing structure and making the wind generated by the fan blade assembly more concentrated; the air at the air inlet enters the inner housing through the air duct and is discharged from the air inlet and outlet channels, further realizing the indoor circulation of the exhaust fan.

[0028] 8. The ion generator is electrically connected to the negative ion electrode. The negative ion electrode is installed on the first cover plate and is located at the air inlet and outlet channels. When the exhaust fan adopts the indoor circulation mode, the negative ion generator is started, and negative ions are generated through the negative ion electrode. The air with negative ions is blown into the room by the exhaust fan, realizing the function of purifying the indoor air and further meeting the actual use needs of users.

[0029] 9. To improve the sealing performance of the housing, the sealing plate is installed on the second cover plate and is hinged to the second cover plate. The sealing plate is used to abut against the second cover plate and covers the exhaust port. When the indoor and outdoor circulation mode is adopted, the fan blade assembly blows the gas in the housing towards the exhaust port, thereby driving the sealing plate to open; when the indoor circulation mode is adopted, without external force, the sealing plate covers the exhaust port, improving the sealing performance of the housing and enabling the gas in the housing to be concentrated and blown towards the air inlet and outlet channels by the fan blade assembly. Description of the Drawings

[0030] Figure 1 It is a schematic structural view of an exhaust fan in an embodiment of the present invention.

[0031] Figure 2 It is a front view of an exhaust fan in an embodiment of the present invention.

[0032] Figure 3 is the cross-section of an exhaust fan in an embodiment of the present utility model Figure 1 .

[0033] Figure 4 is of an embodiment of the present utility model Figure 2 the A-A cross-section Figure 1 .

[0034] Figure 5 is of an embodiment of the present utility model Figure 4 the partial enlarged view at A

[0035] Figure 6 is the cross-section of an exhaust fan in an embodiment of the present utility model Figure 2 .

[0036] Figure 7 is of an embodiment of the present utility model Figure 2 the A-A cross-section Figure 2 .

[0037] Figure 8 is of an embodiment of the present utility model Figure 7 the partial enlarged view at B

[0038] Figure 9 is the structural schematic diagram of a pushing member in an embodiment of the present utility model

[0039] Figure 10 is the structural schematic diagram of a fan blade assembly in an embodiment of the present utility model

[0040] Explanation of reference numerals:

[0041] 100, exhaust fan; 1, housing; 11, inner housing; 12, outer housing; 13, air duct; 14, first opening; 15, second opening; 2, first cover plate; 21, air inlet and outlet channel; 22, bar; 23, air inlet; 3, second cover plate; 31, exhaust port; 32, sealing plate; 4, adjusting assembly; 41, second driving member; 42, lead screw; 43, pushing member; 431, connecting block; 4311, clamping groove; 432, through hole; 433, connecting plate; 4331, first connecting portion; 4332, second connecting portion; 434, connecting rod; 435, guide groove; 436, movable groove; 44, sliding member; 441, receiving groove; 5, ion generator; 6, fan mechanism; 61, fan blade assembly; 611, blade; 612, connecting shaft; 613, connecting arm; 614, sliding shaft; 62, first driving member; 63, driving shaft. Detailed implementation manners

[0042] For the convenience of understanding the present utility model, the specific embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings of the specification.

[0043] Unless otherwise specified or defined, the "first, second..." used in this article is only for distinguishing names and does not represent a specific quantity or order.

[0044] Unless otherwise specified or defined, the term "and / or" used in this article includes any and all combinations of one or more of the related listed items.

[0045] It should be noted that in this article, "fixed to" and "connected to" can be directly fixed or connected to a component, or indirectly fixed or connected to a component.

[0046] As Figures 1 to 10 shown, an exhaust fan 100 includes a housing 1 and a fan mechanism 6. The housing 1 has an inner housing 11 and an outer housing 12. An air inlet and outlet passage 21 is formed inside the inner housing 11. The outer housing 12 is sleeved outside the inner housing 11, and an air inlet 23 is formed between the outer housing 12 and the inner housing 11. The outer housing 12 has an exhaust port 31 disposed opposite to the air inlet and outlet passage 21. The air inlet and outlet passage 21, the air inlet 23, and the exhaust port 31 are interconnected; the fan mechanism 6 includes an adjustment component 4, a fan blade component 61, a first driving member 62, and a driving shaft 63. The first driving member 62 is installed on the housing 1, the driving shaft 63 is installed on the output end of the first driving member 62, the fan blade component 61 is rotatably installed on the driving shaft 63, the first end of the adjustment component 4 is installed on the housing 1, and the second end of the adjustment component 4 is installed on the fan blade component 61. The adjustment component 4 is used to adjust the angle of the fan blade component 61 so that the fan blade component 61 has a first air outlet mode and a second air outlet mode. In the first air outlet mode, the air outlet direction of the fan blade component 61 faces the exhaust port 31. In the second air outlet mode, the air outlet direction of the fan blade component 61 faces the air inlet and outlet passage 21. The first driving member 62 drives the driving shaft 63 to rotate, thereby driving the fan blade component 61 to rotate. The shape and angle design of the fan blade component 61 cause the air to be pushed and form an air flow. At the same time, the fan blade component 61 also utilizes the pressure difference of the air to generate wind; since the fan blade component 61 is rotatably installed on the driving shaft 63, by adjusting the angle of the fan blade component 61 with the adjustment component 4, when the included angle between the fan blade component 61 and the vertical plane is a positive number, the fan blade component 61 is in the first air outlet mode, and the air outlet direction of the fan blade component 61 faces the exhaust port 31. When the included angle between the fan blade component 61 and the vertical plane is a negative number, the fan blade component 61 is in the second air outlet mode, and the air outlet direction of the fan blade component 61 faces the air inlet and outlet passage 21.

[0047] In use, the exhaust fan 100 is installed on the exterior wall, with the air inlet and outlet passage 21 and the air inlet 23 facing indoors and the exhaust port 31 facing outdoors; when the exhaust fan 100 is in the indoor-outdoor circulation mode, the angle of the fan blade assembly 61 is limited by the adjustment assembly 4 so that the angle between the fan blade assembly 61 and the vertical plane is a positive angle. The fan blade assembly 61 sucks the gas in the air inlet and outlet passage 21, and the gas is discharged from the exhaust port 31 during the rotation of the fan blade assembly 61, realizing the indoor-outdoor circulation of air. By adjusting the angle of the fan blade assembly 61 through the adjustment assembly 4 so that the angle between the fan blade assembly 61 and the vertical plane is a negative angle, as the angle of the fan blade assembly 61 changes, the fan blade assembly 61 sucks the gas at the air inlet 23. During the rotation of the fan blade assembly 61, the gas enters the housing 1 and is discharged from the air inlet and outlet passage 21, preventing the gas from being discharged from the exhaust port 31 and realizing the indoor circulation of air.

[0048] As Figure 4 , Figure 5 , Figure 7 and Figure 8 shown, the adjustment assembly 4 includes a second driving member 41, a lead screw 42, a pushing member 43 and a sliding member 44. The second driving member 41 is installed on the housing 1 and is disposed opposite to the first driving member 62. The lead screw 42 is installed on the second driving member 41. The sliding member 44 is sleeved outside the lead screw 42 and is in threaded cooperation with the lead screw 42. The sliding member 44 abuts against the first end of the pushing member 43, and the second end of the pushing member 43 is installed on the fan blade assembly 61. The second driving member 41 is used to rotate clockwise or counterclockwise so that the pushing member 43 has a first moving position and a second moving position in the axial direction of the lead screw 42. In the first moving position, the fan blade assembly 61 is in the first air outlet mode, and in the second moving position, the fan blade assembly 61 is in the second air outlet mode. The second driving member 41 is installed on the housing 1, and by starting the second driving member 41, the lead screw 42 is driven to rotate. The sliding member 44 is sleeved outside the lead screw 42 and is in threaded cooperation with the lead screw 42. When the lead screw 42 drives the sliding member 44 to rotate, since the first end of the pushing member 43 abuts against the sliding member 44, the pushing member 43 is used to limit the rotation of the sliding member 44, and at the same time, the sliding member 44 is used to drive the pushing member 43 to move. The centripetal force generated by the lead screw 42 is converted into a force for driving the sliding member 44 to move back and forth through the threaded cooperation, so that the sliding member 44 drives the pushing member 43 to move back and forth. The pushing member 43 is installed on the fan blade assembly 61, and the angle of the fan blade assembly 61 is adjusted during the movement of the pushing member 43. When the pushing member 43 is in the first moving position, the fan blade assembly 61 is in the first air outlet mode, and when the pushing member 43 is in the second moving position, the fan blade assembly 61 is in the second air outlet mode; thus, it is further realized that the exhaust fan 100 can meet the indoor-outdoor circulation and indoor circulation.

[0049] As Figure 5 , Figure 8 and Figure 9As shown, the driving member 43 includes a connecting block 431 and a connecting plate 433. The sliding member 44 has a receiving groove 441. The cross-section of the receiving groove 441 is T-shaped. The connecting block 431 has a through hole 432 for the lead screw 42 to pass through. The connecting block 431 is sleeved outside the lead screw 42. At least part of the connecting block 431 is located in the receiving groove 441 and abuts against the sliding member 44. The connecting block 431 is installed at the first end of the connecting plate 433, and the second end of the connecting plate 433 is hinged to the outer wall of the fan blade assembly 61. By having at least part of the connecting block 431 located in the receiving groove 441 so that the connecting block 431 abuts against the sliding member 44, the connecting block 431 restricts the rotation of the sliding member 44. At the same time, when the sliding member 44 moves, it drives the connecting block 431 to move. Through the cooperation of the sliding member 44 and the connecting block 431, the way of the lead screw 42 transmitting power is changed. Moreover, the connecting block 431 is installed at the first end of the connecting plate 433, and the second end of the connecting plate 433 is hinged to the outer wall of the fan blade assembly 61. When the connecting plate 433 moves, it drives the fan blade assembly 61 to rotate, thereby adjusting the tilt angle of the fan blade assembly 61.

[0050] In this embodiment, the end of the sliding member 44 close to the connecting block 431 is bent. The outer wall of the connecting block 431 has a clamping groove 4311 for clamping at least part of the sliding member 44, so that the sliding member 44 and the connecting block 431 are clamped to each other, improving the cooperation stability between the sliding member 44 and the connecting block 431. At the same time, there is a stop block (not shown in the figure) in the clamping groove 4311, and this stop block is used to limit the rotation of the sliding member 44, so that when the lead screw 42 moves, it drives the sliding member 44 to move back and forth in the axial direction of the lead screw 42.

[0051] As Figure 5 、 Figure 8 、 Figure 9 and Figure 10As shown, the length direction of the fan blade assembly 61 intersects with the length direction of the drive shaft 63; the fan blade assembly 61 includes blades 611, connecting arms 613 and sliding shafts 614. The connecting arms 613 are connected to the blades 611 through connecting shafts 612, and the sliding shafts 614 are installed on the connecting arms 613; there is a guide groove 435 on the connecting plate 433, and the length direction of the guide groove 435 intersects with the axial line direction of the lead screw 42. At least part of the sliding shaft 614 is located in the guide groove 435 and is rotationally matched with the connecting plate 433. In order to make it easier for the connecting plate 433 to drive the fan blade assembly 61 to rotate when moving, by installing the connecting arm 613 on the blade 611, the sliding shaft 614 on the connecting arm 613, the sliding shaft 614 is located in the guide groove 435, and as the connecting plate 433 moves, the sliding shaft 614 moves in the guide groove 435; the length direction of the guide groove 435 intersects with the axial line direction of the lead screw 42, so that when the connecting plate 433 moves back and forth, the sliding shaft 614 slides from one end of the guide groove 435 to the other end of the guide groove 435. During use, the connecting plate 433 is driven by the connecting block 431 to move towards the front end of the housing 1, and the sliding shaft 614 moves in the guide groove 435, thereby driving the connecting arm 613 to rotate, thereby adjusting the angle of the blade 611; the connecting plate 433, the sliding shaft 614 and the connecting arm 613 form a lever structure. As the sliding shaft 614 rotates to drive the connecting arm 613 to rotate, it makes it easier for the connecting plate 433 to drive the blade 611 to rotate when moving and adjust the angle of the blade 611.

[0052] As Figure 5 , Figure 8 and Figure 10 shown, the connecting shaft 612 is arranged along the length direction of the fan blade assembly 61. The first end of the connecting shaft 612 is installed at the end of the blade 611, and the second end of the connecting shaft 612 is movably installed on the outer wall of the drive shaft 63; the connecting arm 613 is installed on the outer wall of the connecting shaft 612, and the length direction of the connecting arm 613 intersects with the length direction of the connecting shaft 612. The blade 611 is installed on the outer wall of the drive shaft 63 through the connecting shaft 612, which improves the stability of the cooperation between the blade 611 and the drive shaft 63, so that the drive shaft 63 drives the blade 611 to rotate; the blade 611 is also fixed to the connecting arm 613 through the connecting shaft 612, which improves the structural compactness between the blade 611 and the pusher 43, and at the same time facilitates the connecting arm 613 to drive the blade 611 to rotate through the connecting shaft 612 and adjust the angle of the blade 611.

[0053] In this embodiment, the outer wall of the drive shaft 63 has a hole for accommodating the connecting shaft 612. A bearing seat (not shown in the figure) can be provided in the hole, and the connecting shaft 612 is installed on the bearing seat, making it easier for the connecting shaft 612 to rotate along its axis.

[0054] In this embodiment, the drive shaft 63 is coaxially arranged with the lead screw 42 and is in the same direction, and the first drive member 62 and the second drive member 41 are oppositely arranged; both the first drive member 62 and the second drive member 41 are motors.

[0055] To improve the stability of the rotational fit between the sliding shaft 614 and the connecting plate 433. As Figure 5 , Figure 8 and Figure 9 shown, the connecting plate 433 has a first connecting portion 4331 and a second connecting portion 4332. The first connecting portion 4331 and the second connecting portion 4332 are of an integral structure, and both the first connecting portion 4331 and the second connecting portion 4332 have guide grooves 435; an activity groove 436 is formed between the first connecting portion 4331 and the second connecting portion 4332, and the length direction of the activity groove 436 intersects with the length direction of the guide groove 435. At least part of the connecting arm 613 is located in the activity groove 436. By installing the sliding shaft 614 between the first connecting portion 4331 and the second connecting portion 4332, the connection points between the sliding shaft 614 and the connecting plate 433 are increased, and the stability of the rotational fit between the sliding shaft 614 and the connecting plate 433 is improved. Moreover, at least part of the connecting arm 613 is located in the activity groove 436, preventing the connecting arm 613 from being restricted by the connecting plate 433 during rotation, thereby improving the flexibility of the connecting arm 613. When the connecting plate 433 moves away from the front end of the housing 1, the connecting arm 613 rotates around the connecting shaft 612 and will drive the sliding shaft 614 to move in the guide groove 435. The sliding shaft 614 moves from the bottom of the guide groove 435 to the top of the guide groove 435; when the connecting arm 613 rotates to a certain angle, the sliding shaft 614 will move from the top of the guide groove 435 to the bottom of the guide groove 435, further realizing the angle adjustment of the blade 611, so that the fan blade assembly 61 has a first air outlet mode and a second air outlet mode.

[0056] As Figure 9 shown, the pushing member 43 further has a connecting rod 434. The connecting rod 434 is bent, and the first end of the connecting rod 434 is installed on the connecting block 431, and the second end of the connecting rod 434 is installed on the connecting plate 433. The connecting rod 434 is used to connect the connecting plate 433 and the connecting block 431, and through the connecting rod 434, the axis line of the connecting plate 433 is parallel to the axis line of the lead screw 42; thus arranged, the guide groove 435 of the connecting plate 433 is perpendicular to the axis line of the drive shaft 63. When the connecting plate 433 moves, due to the shape of the guide groove 435 of the connecting plate 433, the guide groove 435 is tangent to the movement track of the sliding shaft 614, and the connecting plate 433 applies a circumferential force to the sliding shaft 614 through the guide groove 435, thereby driving the connecting arm 613 to rotate, further realizing the adjustment of the angle of the blade 611.

[0057] In this embodiment, there are three such connecting plates 433 and three connecting rods 434 respectively. The three connecting rods 434 are respectively installed on the circumference of the connecting block 431 and are equidistantly distributed along the circumference of the connecting block 431. At the same time, there are three blades 611, three connecting arms 613, and three sliding shafts 614 respectively. The blades 611, connecting arms 613, and sliding shafts 614 are equidistantly distributed along the circumference of the drive shaft 63. The three connecting plates 433 respectively correspond to the three sliding shafts 614. When the three connecting plates 433 are driven by the connecting block 431 to move, the three sliding shafts 614 are simultaneously driven to move in the guide groove 435, and the angles of the three blades 611 are adjusted through the three connecting arms 613. The three blades 611 facilitate the fan blade assembly 61 to maintain balance. When the number of blades 611 is too large, it is more difficult for the fan blade assembly 61 to balance, and the cost is high. Moreover, when the number of blades 611 is too large, the resistance is large, which will generate adverse factors that interfere with the rotation of the blades 611 and reduce the energy conversion rate.

[0058] As Figure 2 , Figure 3 and Figure 6 shown, both the outer shell 12 and the inner shell 11 are in a hollow barrel-shaped structure. The inner diameter of the outer shell 12 is larger than that of the inner shell 11. The fan blade assembly 61 is located in the inner shell 11. The housing 1 also has a first cover plate 2 and a second cover plate 3. The front end of the inner shell 11 or the outer shell 12 is installed on the first cover plate 2, and the rear end of the outer shell 12 is installed on the second cover plate 3. A wind channel 13 is formed between the inner shell 11 and the outer shell 12. The two ends of the wind channel 13 communicate with the air inlet 23 and the exhaust port 31 respectively. The fan blade assembly 61 is located in the inner shell 11, which improves the compactness between the fan blade assembly 61 and the housing 1. At the same time, when the fan blade assembly 61 rotates, the rotation range of the fan blade assembly 61 mostly coincides with the air inlet and outlet channel 21 of the inner shell 11. The wind generated by the fan blade assembly 61 basically acts on the air inlet and outlet channel 21, making the air flow in the air inlet and outlet channel 21 more concentrated and stable. Moreover, the inner shell 11 or the outer shell 12 is installed on the first cover plate 2, and the outer shell 12 is installed on the second cover plate 3, which improves the sealing performance of the housing 1 structure and makes the wind generated by the fan blade assembly 61 more concentrated. The air at the air inlet 23 enters the inner shell 11 through the wind channel 13 and is discharged from the air inlet and outlet channel 21, further realizing the indoor circulation of the exhaust fan 100.

[0059] In this embodiment, the front and rear ends of the outer shell 12 and the inner shell 11 respectively have a first opening 14 and a second opening 15. The first opening 14 is used to accommodate the first cover plate 2, and the second opening 15 is used to accommodate the second cover plate 3. The first cover plate 2 has a plurality of blocking bars 22. The plurality of blocking bars 22 are arranged in parallel. There are gaps between the plurality of blocking bars 22. The plurality of blocking bars 22 are located at the air inlet and outlet channel 21 and the air inlet 23. The plurality of blocking bars 22 are also fixed to the inner shell 11, improving the stability of the first cover plate 2. The first cover plate 2 is used to prevent the external environment from interfering with the rotation of the fan blade assembly 61 in the inner shell 11.

[0060] As shown Figure 5 and as shown Figure 7 As shown, the exhaust fan 100 further includes an ion generator 5 and a negative ion electrode 51. The ion generator 5 is installed on the second cover plate 3, and the negative ion electrode 51 is installed on the first cover plate 2 and is located at the air inlet and outlet passage 21; the negative ion electrode 51 is electrically connected to the ion generator 5. By electrically connecting the ion generator 5 and the negative ion electrode 51, and installing the negative ion electrode 51 on the first cover plate 2 and at the air inlet and outlet passage 21, when the exhaust fan 100 adopts the indoor circulation mode, the negative ion generator 5 is started, and negative ions generated by the negative ion electrode 51 are used. The air with negative ions is blown into the room by the exhaust fan 100, achieving the effect of fresh indoor air and further meeting the actual use needs of users.

[0061] To improve the sealing performance of the housing 1. As shown Figure 1 and Figure 4 As shown, the housing 1 further includes a sealing plate 32. The first end of the sealing plate 32 is installed on the second cover plate 3 and is hinged to the top of the second cover plate 3; the second end of the sealing plate 32 abuts against the bottom of the second cover plate 3, and the sealing plate 32 covers the exhaust port 31. By installing the sealing plate 32 on the second cover plate 3 and hinging it to the second cover plate 3, the sealing plate 32 is used to abut against the second cover plate 3, and the sealing plate 32 covers the exhaust port 31; when the indoor-outdoor circulation mode is adopted, the fan blade assembly 61 blows the gas in the housing 1 towards the exhaust port 31, thereby driving the sealing plate 32 to open; when the indoor circulation mode is adopted, without external force, the sealing plate 32 will cover the exhaust port 31, and the air outlet direction of the fan blade assembly 61 faces the air inlet and outlet passage 21, forming a negative pressure in the housing 1, improving the sealing performance of the housing 1, and the gas in the housing 1 is concentrated and blown by the fan blade assembly 61 towards the air inlet and outlet passage 21.

[0062] As shown Figure 1 , Figure 4 and Figure 7 As shown, an operation method of an exhaust fan 100 includes the following steps:

[0063] Step 1: Start the fan mechanism 6, the fan blade assembly 61 is in the first air outlet mode, and the fan blade assembly 61 sucks the gas in the air inlet and outlet passage 21 and discharges it towards the exhaust port 31, so that the exhaust fan 100 realizes the indoor-outdoor circulation mode;

[0064] Step 2: Start the adjustment component 4, the adjustment component 4 is used to change the angle of the fan blade assembly 61, and the fan blade assembly 61 is converted from the second air outlet mode to the first air outlet mode; the fan blade assembly 61 sucks the gas at the air inlet 23 and discharges it towards the air inlet and outlet passage 21, so that the exhaust fan 100 realizes the indoor circulation mode.

[0065] By starting the adjustment component 4, the exhaust fan 100 is switched from the indoor-outdoor circulation mode to the indoor circulation mode. Its operation method is simple and can meet the indoor external-internal circulation and internal circulation.

[0066] The working principle of this exhaust fan 100 is as follows: As Figures 3 to 5 shown, in the indoor-outdoor circulation mode of the exhaust fan 100, the fan blade assembly 61 rotates synchronously under the drive of the drive shaft 63; at this time, the second driving member 41 is started to rotate forward (clockwise), and the rotation of the second driving member 41 drives the screw rod 42 to rotate. The sliding member 44 moves in the axial direction of the screw rod 42 and towards the first driving member 62, and at the same time drives the connecting plate 433 to move. The connecting plate 433 drives the connecting arm 613 to rotate through the rotational cooperation with the sliding shaft 614, pushes the blade 611 to rotate and adjusts the angle of the blade 611, so that under the drive of the blade 611, the air flows from the air inlet and outlet channel 21 towards the exhaust port 31. Under the action of the wind pressure, the sealing plate 32 of the housing 1 opens outwards, and the air is inhaled from the front end (air inlet and outlet channel 21) of the exhaust fan 100 and discharged from the rear end (exhaust port 31) of the exhaust fan 100 to realize the exhaust function. In this case, the negative ion generator 5 stops working.

[0067] As Figures 6 to 8 shown, in the indoor circulation mode of the exhaust fan 100, the second driving member 41 is started to rotate in the reverse direction (counterclockwise). The rotation of the second driving member 41 drives the screw rod 42 to rotate. The sliding member 44 moves in the axial direction of the screw rod 42 and towards the second driving member 41, and at the same time drives the connecting plate 433 to move; the connecting plate 433 drives the connecting arm 613 to rotate through the rotational cooperation with the sliding shaft 614, pulls the blade 611 to rotate and adjusts the angle of the blade 611. In this embodiment, the change in the angle of this blade 611 can be understood as that the inclination angles of the blade 611 in the indoor-outdoor circulation mode and the indoor circulation mode of the exhaust fan 100 are opposite, so that under the drive of the blade 611, the air enters the housing 1 from the air inlet 23. Under the action of the wind pressure, a negative pressure is formed inside the housing 1, and the sealing plate 32 of the housing 1 is squeezed towards the inside of the housing 1 to close the exhaust port 31. The air is inhaled from the front end (air inlet 23) of the exhaust fan 100 and discharged from the front end (air inlet and outlet channel 21) of the exhaust fan 100 to realize the blowing function and complete the circulation of the indoor air. In this case, the negative ion generator 5 starts to work, and the negative ions generated on the negative ion electrode 51 are carried out by the air discharged from the exhaust fan 100 to realize the fresh air effect on the indoor air.

[0068] The above embodiments are not an exhaustive list based on the present invention. In addition, there may be multiple other embodiments not listed. Any replacement and improvement made on the basis of not violating the concept of the present invention fall within the protection scope of the present invention.

Claims

1. Exhaust fan, characterized in that, Comprising: A housing, the housing having an inner housing and an outer housing, an air inlet and outlet passage formed inside the inner housing, the outer housing sleeved outside the inner housing, and an air inlet formed between the outer housing and the inner housing, the outer housing having an exhaust port disposed opposite to the air inlet and outlet passage, and the air inlet and outlet passage, air inlet, and exhaust port being interconnected; A fan mechanism, the fan mechanism including an adjustment assembly, a fan blade assembly, a first driving member, and a driving shaft, the first driving member mounted on the housing, the driving shaft mounted on the output end of the first driving member, the fan blade assembly rotatably mounted on the driving shaft, the first end of the adjustment assembly mounted on the housing, and the second end of the adjustment assembly mounted on the fan blade assembly; The adjustment assembly is used to adjust the angle of the fan blade assembly so that the fan blade assembly has a first air outlet mode and a second air outlet mode. In the first air outlet mode, the air outlet direction of the fan blade assembly faces the exhaust port, and in the second air outlet mode, the air outlet direction of the fan blade assembly faces the air inlet and outlet passage.

2. The exhaust fan according to claim 1, wherein The adjustment assembly includes a second driving member, a lead screw, a pushing member, and a sliding member. The second driving member is mounted on the housing and is disposed opposite to the first driving member. The lead screw is mounted on the second driving member. The sliding member is sleeved outside the lead screw and is in threaded cooperation with the lead screw. The sliding member abuts against the first end of the pushing member, and the second end of the pushing member is mounted on the fan blade assembly; The second driving member is used to rotate clockwise or counterclockwise so that the pushing member has a first moving position and a second moving position in the axial direction of the lead screw. In the first moving position, the fan blade assembly is in the first air outlet mode, and in the second moving position, the fan blade assembly is in the second air outlet mode.

3. The exhaust fan according to claim 2, wherein , The pushing member includes a connecting block and a connecting plate. The sliding member has a receiving groove, the cross-section of the receiving groove is T-shaped, the connecting block is sleeved outside the lead screw, at least part of the connecting block is located in the receiving groove and abuts against the sliding member; the connecting block is mounted on the first end of the connecting plate, and the second end of the connecting plate is hinged to the outer wall of the fan blade assembly.

4. The exhaust fan according to claim 3, wherein The length direction of the fan blade assembly intersects with the length direction of the driving shaft; the fan blade assembly includes blades, connecting arms, and sliding shafts. The connecting arms are mounted on the blades, and the sliding shafts are mounted on the connecting arms; the connecting plate has a guide groove, the length direction of the guide groove intersects with the axial direction of the lead screw, and at least part of the sliding shaft is located in the guide groove and is in rotational cooperation with the connecting plate.

5. The exhaust fan according to claim 4, wherein, The fan blade assembly further has a connecting shaft, the connecting shaft is arranged along the length direction of the fan blade assembly, the first end of the connecting shaft is mounted on the end of the blade, and the second end of the connecting shaft is movably mounted on the outer wall of the driving shaft; the connecting arm is mounted on the outer wall of the connecting shaft, and the length direction of the connecting arm intersects with the length direction of the connecting shaft.

6. The exhaust fan according to claim 4, characterized in that , The connecting plate has a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are of an integral structure, and both the first connecting portion and the second connecting portion have the guide grooves; an activity groove is formed between the first connecting portion and the second connecting portion, the length direction of the activity groove intersects with the length direction of the guide groove, and at least part of the connecting arm is located in the activity groove.

7. The exhaust fan according to any one of claims 1 to 6, characterized in that, The outer shell and the inner shell are both in a hollow barrel-shaped structure. The inner diameter of the outer shell is larger than that of the inner shell, and the fan blade assembly is located in the inner shell; The housing further has a first cover plate and a second cover plate. The front end of the inner shell or the outer shell is installed on the first cover plate, the rear end of the outer shell is installed on the second cover plate, and an air duct is formed between the inner shell and the outer shell. Both ends of the air duct communicate with the air inlet and the exhaust port respectively.

8. The exhaust fan according to claim 7, wherein, The exhaust fan further has an ion generator and a negative ion electrode. The ion generator is installed on the second cover plate, the negative ion electrode is installed on the first cover plate and is located at the air inlet and outlet channel; the negative ion electrode is electrically connected to the ion generator.

9. The exhaust fan according to claim 7, wherein, The housing further has a sealing plate. The first end of the sealing plate is installed on the second cover plate and is hinged to the top of the second cover plate; the second end of the sealing plate abuts against the bottom of the second cover plate, and the sealing plate covers the exhaust port.

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