Noise reduction structure of window type ventilator

Abstract

The utility model discloses a noise reduction structure of a window type ventilator, and relates to the technical field of door and window ventilation. Comprising a box body installed on a window, an air duct is formed in the box body, a panel is installed at an air outlet of the air duct, a first filter screen is installed at an air inlet of the air duct, a sound insulation assembly used for sound insulation when ventilation is not conducted is arranged in the air duct, and a cross-flow fan is arranged in the sound insulation assembly; the cross-flow fan is used for conveying air at the air inlet of the air duct to the air outlet of the air duct; and sound-absorbing cotton for reducing outdoor noise and wind noise during ventilation is mounted on the inner wall of the air duct. By means of the sound insulation assembly, when ventilation is not carried out, outdoor noise entering a room can be effectively reduced; by means of sound-absorbing cotton installed on the inner wall of the air duct, outdoor noise and air noise entering a room can be effectively reduced during ventilation; and the comfort of a user is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of door and window ventilation technology, and in particular to a noise reduction structure for a window ventilator. Background Technology

[0002] Window ventilators are ventilation devices installed on windows, using their own power source to provide ventilation. However, when existing window ventilators are turned on, outdoor noise can easily enter the room through the air ducts inside, affecting user comfort. Therefore, there is an urgent need for a noise reduction structure for window ventilators that can effectively reduce the intrusion of outdoor noise and improve user comfort. Utility Model Content

[0003] The purpose of this invention is to provide a noise reduction structure for a window ventilator to solve the problems existing in the prior art.

[0004] To achieve the above objectives, this utility model provides the following solution: This utility model provides a noise reduction structure for a window ventilator, including a box installed on a window, an air duct inside the box, a panel installed at the air outlet of the air duct, a first filter screen installed at the air inlet of the air duct, a sound insulation component for sound insulation when ventilation is not in progress, a cross-flow fan installed inside the sound insulation component, the cross-flow fan for transporting air from the air inlet of the air duct to the air outlet of the air duct; and sound-absorbing cotton installed on the inner wall of the air duct for reducing outdoor noise and wind noise when ventilation is in progress.

[0005] Preferably, the panel has several ventilation openings, which are connected to the air outlet of the air duct, and a second filter screen is installed on the side of the panel facing the housing.

[0006] Preferably, the sound insulation component includes a first bearing and a base disposed opposite to each other, and the first bearing and the base are respectively fixedly connected to a sound insulation plate by a connecting rod.

[0007] Preferably, one of the sound insulation panels is larger than the size of the air outlet of the air duct, and the other sound insulation panel is larger than the size of the air inlet of the air duct.

[0008] Preferably, the first bearing is sleeved on the output shaft of the motor of the cross-flow fan, and the base is located at the end of the cross-flow fan away from the motor.

[0009] Preferably, a limiting groove is provided on the base, and a second bearing is installed in the limiting groove. The second bearing is rotatably connected to the drive shaft at the end of the motor of the cross-flow fan away from the cross-flow fan.

[0010] Preferably, the end of the base opposite to the limiting groove is connected to the output shaft of a drive motor.

[0011] Preferably, the drive motor is fixedly connected to the inner wall of the air duct.

[0012] The present invention discloses the following technical effects:

[0013] This invention effectively reduces outdoor noise from entering the room when ventilation is not in use by using sound insulation components; and effectively reduces outdoor noise and wind noise from entering the room when ventilation is in use by using sound-absorbing cotton installed on the inner wall of the air duct; thus effectively improving the comfort of users. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the rear view structure of the panel of this utility model;

[0017] Figure 3 This is a schematic diagram of the air duct inside the housing of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of this utility model when the ventilation is turned on;

[0019] Figure 5 This is a schematic diagram of the structure of this utility model when the ventilation is closed;

[0020] Figure 6 This is a schematic diagram of the sound insulation component structure of this utility model;

[0021] Figure 7 This is a cross-sectional view of the first bearing of this utility model;

[0022] Figure 8 This is a cross-sectional view of the base structure of this utility model;

[0023] The components are as follows: 1. Housing; 2. Panel; 3. Sound insulation board; 4. Cross-flow fan; 11. Air duct; 12. Sound-absorbing cotton; 13. Air outlet; 14. First filter screen; 21. Second filter screen; 22. Ventilation port; 31. First bearing; 32. Base; 33. Limiting groove; 34. Drive motor; 35. Connecting rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Reference Figures 1-8 This utility model discloses a noise reduction structure for a window ventilator, including a box 1 installed on a window, an air duct 11 inside the box 1, a panel 2 installed at the air outlet 13 of the air duct 11, a first filter 14 installed at the air inlet of the air duct 11, a sound insulation component for sound insulation when ventilation is not in operation, a cross-flow fan 4 installed inside the sound insulation component, the cross-flow fan 4 for transporting air from the air inlet of the air duct 11 to the air outlet 13 of the air duct 11; and sound-absorbing cotton 12 installed on the inner wall of the air duct 11 to reduce outdoor noise and wind noise when ventilation is in operation.

[0027] The first filter 14 can effectively prevent insects, lint, and other debris from entering the air duct 11; at the same time, since the air inlet of the air duct 11 is opened downwards, heavier foreign objects can fall off on their own when ventilation is not in operation.

[0028] The cross-flow fan 4 is a special type of fan with a multi-bladed, long cylindrical impeller featuring forward-curving multi-wing blades. The working principle of this fan is as follows: when the impeller rotates, airflow enters the blade cascade from the open end of the impeller, passes through the interior of the impeller, and exits into the volute from the other side of the blade cascade, forming the working airflow. The airflow within the impeller is complex, and the airflow velocity field is unstable. A vortex exists within the impeller, centered near the volute tongue. The presence of the vortex creates a circulating flow at the impeller output end. Outside the vortex, the airflow streamlines within the impeller are arc-shaped. Therefore, the flow velocity at different points on the outer circumference of the impeller is inconsistent; the closer to the vortex center, the greater the velocity, and the closer to the volute casing, the smaller the velocity. At the fan outlet, the airflow velocity and pressure are not uniform, thus the fan's flow coefficient and pressure coefficient are average values.

[0029] The impeller of a cross-flow fan (4) is typically made of aluminum alloy or engineering plastic. Aluminum alloy impellers are high-strength, lightweight, and heat-resistant, ensuring long-term stable operation without deformation. Plastic impellers are injection molded and then ultrasonically welded, generally used in lower-speed applications, and have a larger diameter. The casing features a streamlined design, effectively reducing airflow loss and significantly improving the fan's efficiency. The electric motor is the power component of the cross-flow fan and can be powered by AC or DC. AC power primarily uses shaded-pole motors and capacitor-start motors, while DC power uses brushless DC motors. The drive motor is generally flexibly mounted to the impeller.

[0030] Sound-absorbing cotton 12 is a man-made inorganic fiber, mainly made from natural minerals such as quartz sand, limestone, and dolomite, combined with some chemical raw materials such as soda ash and borax to be melted into glass. In the molten state, it is blown into flocculent fine fibers by external force. The fibers are three-dimensionally intertwined and entangled with each other, presenting many tiny gaps.

[0031] The types of sound-absorbing cotton 12 include sound insulation felt, environmentally friendly sound-absorbing cotton, and polyester fiber sound-absorbing panels (B1 and B2 grades). Sound-absorbing cotton 12 can effectively absorb sound energy and suppress standing waves inside the enclosure 1.

[0032] This invention effectively reduces outdoor noise from entering the room when ventilation is not in use by using sound insulation components; and effectively reduces outdoor noise and wind noise from entering the room when ventilation is in use by using sound-absorbing cotton 12 installed on the inner wall of the air duct 11; thus effectively improving the comfort of users.

[0033] Further optimizing the design, several ventilation openings 22 are provided on panel 2, which are connected to the air outlets 13 of air duct 11. A second filter 21 is installed on the side of panel 2 facing the housing 1. The air in air duct 11 first blows towards the second filter 21, which can filter out impurities. The air in air duct 11 then passes through the second filter 21 and the ventilation openings 22 in sequence before entering the room.

[0034] The sound insulation component is further optimized by including a first bearing 31 and a base 32 arranged opposite to each other. The first bearing 31 and the base 32 are respectively fixedly connected to a sound insulation plate 3 by a connecting rod 35.

[0035] Sound insulation panels 3 are materials used to reduce or block the propagation of sound and are widely used in building, industrial and home environments.

[0036] Sound insulation panels can be divided into two categories: building sound insulation and structure sound insulation. According to the location of the sound insulation, they can be divided into indoor sound insulation and outdoor sound insulation. Sound insulation panels can also be classified according to the sound insulation method, such as composite sound insulation and structurally self-insulating sound insulation. Composite sound insulation refers to the use of multiple sound insulation materials, while structurally self-insulating sound insulation is a method of blocking sound transmission through structural design.

[0037] The design is further optimized by having one sound insulation panel 3 larger than the air outlet 13 of the air duct 11, and the other sound insulation panel 3 larger than the air inlet of the air duct 11. This allows the two sound insulation panels 3 to effectively cover and block the air outlet 13 and the air inlet of the air duct 11, respectively, effectively preventing outdoor noise from entering the room through the air duct 11.

[0038] In a further optimized design, the first bearing 31 is mounted on the output shaft of the motor of the cross-flow fan 4, and the base 32 is located at the end of the cross-flow fan 4 away from the motor. The first bearing 31 and the base 32 enable the impeller of the cross-flow fan 4 to operate stably.

[0039] To further optimize the design, a limiting groove 33 is provided on the base 32, and a second bearing is installed in the limiting groove 33. The second bearing is rotatably connected to the drive shaft at the end of the cross-flow fan 4 away from the motor. This allows the motor of the cross-flow fan 4 to stably drive the impeller of the cross-flow fan 4 to rotate.

[0040] In a further optimized design, the end of the base 32 facing away from the limiting groove 33 is connected to the output shaft of the drive motor 34. The drive motor 34 drives the base 32 to rotate, and the base 32 drives the two sound insulation plates 3 to rotate through the two connecting rods 35. At this time, the first bearing 31 rotates around the output shaft of the motor of the cross-flow fan 4, and the second bearing rotates around the drive shaft of the end of the cross-flow fan 4 away from the motor.

[0041] When ventilation is required, the air inlet of the air duct 11 is connected to the air outlet of the air duct 11 by rotating the two sound insulation panels 3, so that the outdoor air enters the room through the air duct 11.

[0042] When ventilation is not required, the two sound insulation panels 3 can be rotated to effectively cover and block the air outlet 13 and air inlet of the air duct 11 respectively, effectively preventing outdoor noise from entering the room through the air duct 11.

[0043] The design was further optimized by fixing the drive motor 34 to the inner wall of the air duct 11. This allows the drive motor 34 to stably drive the base 32 to rotate.

[0044] The drive motor 34 is a stepper motor, which is an open-loop control element that converts electrical pulse signals into angular or linear displacement. By controlling the sequence, frequency, and number of electrical pulses applied to the motor coils, the direction, speed, and rotation angle of the stepper motor can be controlled. Under non-overload conditions, the motor's speed and stopping position depend only on the frequency and number of pulse signals, and are unaffected by load changes.

[0045] A stepper motor driver, based on external control pulses and direction signals, uses its internal logic circuitry to control the stepper motor windings to be energized in a specific timing sequence, either forward or reverse, causing the motor to rotate in the forward / reverse direction or lock. For example, when both phase windings are energized, the motor output shaft will remain stationary and locked in position. If the current in one phase winding changes direction, the motor will rotate one step in the predetermined direction. Similarly, if the current in the other phase winding changes direction, the motor will rotate one step in the opposite direction. When the current through the coil windings is sequentially energized in reverse direction, the motor will achieve continuous stepping rotation in the predetermined direction with very high precision.

[0046] Controlling a stepper motor is quite simple, mainly involving two points: to control the stepper motor to rotate by one angle, only one pulse is needed, and the number of pulses depends on the angle of rotation; by controlling the number of pulses, the angular displacement can be controlled, thereby achieving accurate positioning; at the same time, the speed and acceleration of the motor can be controlled by controlling the pulse frequency, thereby achieving speed regulation.

[0047] The stepper motor can effectively rotate the base 32, allowing the two sound insulation plates 3 to effectively cover and block the air outlet 13 and air inlet of the air duct 11.

[0048] Working process: When ventilation is not required, the base 32 is rotated by the drive motor 34. The base 32 rotates the two sound insulation panels 3 through the connecting rod 35, so that the two sound insulation panels 3 can effectively cover and block the air outlet 13 and the air inlet of the air duct 11 respectively, effectively preventing outdoor noise from entering the room through the air duct 11.

[0049] When ventilation is required, the base 32 is rotated by the drive motor 34. The base 32 rotates the two sound insulation panels 3 through the connecting rod 35, so that the two sound insulation panels 3 cannot cover or block the air outlet 13 and air inlet of the air duct 11, so that the air inlet and air outlet of the air duct 11 are connected. When the cross-flow fan 4 is turned on, the sound-absorbing cotton 12 effectively reduces outdoor noise and wind noise entering the room, and allows outdoor air to enter the room effectively through the air duct 11.

[0050] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A noise reduction structure for a window-type ventilator, characterized in that: The system includes a box (1) installed on a window, a duct (11) is provided inside the box (1), a panel (2) is installed at the air outlet (13) of the duct (11), a first filter (14) is installed at the air inlet of the duct (11), a sound insulation component is provided inside the duct (11) for sound insulation when ventilation is not performed, and a cross-flow fan (4) is provided inside the sound insulation component. The cross-flow fan (4) is used to deliver the air at the air inlet of the duct (11) to the air outlet (13) of the duct (11). The inner wall of the air duct (11) is equipped with sound-absorbing cotton (12) to reduce outdoor noise and wind noise during ventilation.

2. The noise reduction structure for a window-type ventilator according to claim 1, characterized in that: The panel (2) has several ventilation openings (22), which are connected to the air outlet (13) of the air duct (11). A second filter screen (21) is installed on the side of the panel (2) facing the box (1).

3. The noise reduction structure for a window-type ventilator according to claim 1, characterized in that: The sound insulation component includes a first bearing (31) and a base (32) arranged opposite to each other, and the first bearing (31) and the base (32) are respectively fixedly connected to a sound insulation plate (3) by a connecting rod (35).

4. The noise reduction structure for a window-type ventilator according to claim 3, characterized in that: One of the sound insulation panels (3) is larger than the size of the air outlet (13) of the air duct (11), and the other sound insulation panel (3) is larger than the size of the air inlet of the air duct (11).

5. The noise reduction structure for a window-type ventilator according to claim 3, characterized in that: The first bearing (31) is sleeved on the output shaft of the motor of the cross-flow fan (4), and the base (32) is located at the end of the cross-flow fan (4) away from the motor of the cross-flow fan (4).

6. The noise reduction structure for a window-type ventilator according to claim 5, characterized in that: A limiting groove (33) is provided on the base (32), and a second bearing is installed in the limiting groove (33). The second bearing is rotatably connected to the drive shaft at the end of the motor of the cross-flow fan (4) away from the motor of the cross-flow fan (4).

7. The noise reduction structure for a window-type ventilator according to claim 6, characterized in that: The base (32) is connected to the output shaft of the drive motor (34) at the end opposite to the limiting groove (33).

8. The noise reduction structure for a window-type ventilator according to claim 7, characterized in that: The drive motor (34) is fixedly connected to the inner wall of the air duct (11).

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