Air valve assembly for fresh air machine and fresh air machine

Abstract

The application relates to the technical field of household appliances, and discloses a wind valve assembly for a fresh air machine. The valve is provided with a rack structure, and a motor is correspondingly provided with a gear structure. The gear and the rack are mutually engaged. In this way, the motor can control the rotation of the valve through the transmission of the gear and the rack, and further adjust the opening degree of the valve. In this way, the self-locking capability of the motor and the valve can be improved through the connecting structure of the gear and the rack, and further, the loosening of the valve can be avoided, so that the effect that the air supply amount to the room is kept constant at a preset air supply amount is achieved. Meanwhile, the application further discloses a fresh air machine.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, for example to a valve assembly for a fresh air system and a fresh air system. Background Technology

[0002] As society develops, users have increasingly higher demands for quality of life. In summer and winter, users often keep doors and windows closed for extended periods, leading to stale indoor air and increased carbon dioxide levels. Therefore, users often install fresh air systems to treat outdoor air before delivering it indoors, improving indoor air quality. To further enhance the user experience, existing fresh air systems allow users to preset airflow volumes based on their needs, ensuring a constant air volume. For example, the fresh air system can control the airflow by adjusting the fan speed, but this can result in a lag in the change in airflow.

[0003] In related technologies, a damper structure is typically installed at the air outlet to adjust the air volume delivered to the room by the fresh air unit in a timely manner. This allows for direct adjustment of the air volume blown into the room by controlling the opening of the damper structure.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In related technologies, fresh air fans equipped with air valve structures typically use a motor to drive the valve plate to rotate, thereby adjusting the opening of the air valve structure. However, this method of adjustment relying solely on motor torque may result in the valve plate becoming loose, causing the air volume supplied to the room to be inconsistent with the preset air volume.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a valve assembly and a fresh air unit for a fresh air system. The valve has a rack and pinion structure, and the motor has a corresponding gear structure, with the gear and rack meshing with each other. In this way, the motor can control the rotation of the valve through the transmission of the gear and rack, thereby adjusting the valve opening. This configuration improves the self-locking capability of the motor and valve through the gear and rack connection structure, thus preventing the valve from loosening and achieving the effect of keeping the air volume supplied to the room constant at a preset air volume.

[0009] This disclosure provides an air valve assembly for a fresh air unit, comprising: a valve body, an air damper, and a drive motor. The valve body has a ventilation hole; the air damper includes a valve plate and a connecting plate, the valve plate being rotatably mounted at the ventilation hole via a rotating shaft, the connecting plate being fixedly mounted on the side wall of the valve plate, and the side wall of the connecting plate being provided with a rack; the drive motor includes a drive shaft with a gear, the gear meshing with the rack; wherein, the drive shaft is used to drive the gear to rotate, thereby driving the connecting plate to move around the rotating shaft of the valve plate via the rack, and further driving the valve plate to rotate around the rotating shaft to block or unblock the ventilation hole of the valve body.

[0010] In some embodiments, the rack is configured as a fan-shaped annular structure, and the center of the rack is located on the rotation axis of the valve plate.

[0011] In some embodiments, the connecting plate is configured as a fan-shaped or fan-ring structure, and the connecting plate and the rack are concentrically arranged; wherein the radius of the connecting plate is greater than or equal to the outer radius of the rack.

[0012] In some embodiments, the central angle of the rack is greater than or equal to a preset angle.

[0013] In some embodiments, the fresh air unit includes a control device; the air valve assembly further includes a wind speed sensor. The wind speed sensor is disposed at the ventilation opening and is used to obtain the airflow velocity at the ventilation opening; wherein the control device is electrically connected to both the wind speed sensor and the drive motor; when the valve plate clears the ventilation opening, the control device is used to control the opening degree of the valve plate according to the airflow velocity at the ventilation opening.

[0014] In some embodiments, the opening degree of the valve plate is inversely proportional to the air velocity at the vent.

[0015] In some embodiments, the inner wall of the ventilation hole is provided with a mounting groove, and the mounting groove is provided with a snap-fit ​​part; the drive motor is provided with a snap-fit ​​mating part corresponding to the snap-fit ​​part; wherein the drive motor is installed in the mounting groove, and the snap-fit ​​mating part can snap onto the snap-fit ​​part.

[0016] In some embodiments, the valve plate's pivot is horizontally connected to the inner wall of the ventilation hole, allowing the valve plate to rotate in a vertical plane; the mounting groove is provided corresponding to the upper or lower half of the valve plate; wherein the direction of movement of the half of the valve plate corresponding to the drive motor is defined as moving away from the drive motor.

[0017] This disclosure also provides a fresh air unit comprising: a housing and the aforementioned air valve assembly for the fresh air unit. The housing is provided with an air outlet; the air valve assembly is installed at the air outlet of the housing.

[0018] In some embodiments, the fresh air unit further includes: a fan. The fan is disposed within a housing; a control device electrically connected to both the fan and the damper assembly; wherein the control device is used to control the opening degree of the damper plate of the damper assembly according to the fan speed.

[0019] The air valve assembly and fresh air unit for a fresh air system provided in this disclosure can achieve the following technical effects:

[0020] This disclosure provides an air valve assembly for a fresh air unit, comprising: a valve body, an air damper, and a drive motor. The valve body has ventilation holes; the air damper includes a valve plate and a connecting plate. The valve plate is rotatably mounted at the ventilation holes via a rotating shaft, and the connecting plate is fixedly mounted on the side wall of the valve plate. A rack is provided on the side wall of the connecting plate. The drive motor includes a drive shaft with gears meshing with the rack. The drive shaft drives the gears to rotate, thereby causing the connecting plate to move around the rotating shaft of the valve plate via the rack, which in turn causes the valve plate to rotate around the rotating shaft to block or clear the ventilation holes in the valve body. Thus, the drive shaft of the drive motor can drive the gears to rotate, which in turn causes the valve plate to move around the rotating shaft in a first or second direction via the rack and connecting plate, thereby blocking or clearing the ventilation holes. When the valve plate clears the ventilation holes, the motor can continue to drive the valve plate to rotate in the first or second direction to adjust the opening of the valve plate. This configuration improves the self-locking capability of the motor and valve through the gear and rack connection structure, thereby preventing the valve from becoming loose and achieving the effect of keeping the air volume supplied to the room constant at the preset air volume.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a damper assembly provided in an embodiment of this disclosure;

[0024] Figure 2 This is a schematic diagram of the structure of a valve body provided in an embodiment of this disclosure;

[0025] Figure 3 This is a schematic diagram of the structure of a damper provided in an embodiment of this disclosure;

[0026] Figure 4 This is a schematic diagram of the structure of a drive motor provided in an embodiment of this disclosure;

[0027] Figure 5 This is a schematic diagram of a drive motor and damper provided in an embodiment of this disclosure.

[0028] Figure label:

[0029] 10: Valve body; 11: Ventilation hole; 12: Shaft; 13: Mounting groove; 14: Clip;

[0030] 20: Damper; 21: Valve plate; 22: Connecting plate; 23: Rack; 24: Guide groove;

[0031] 30: Drive motor; 31: Gear; 32: Guide column. Detailed Implementation

[0032] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0033] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0034] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0035] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0036] Unless otherwise stated, the term "multiple" means two or more.

[0037] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0038] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0040] like Figures 1 to 5 As shown in the figure, this disclosure provides a valve assembly for a fresh air unit and a fresh air unit. The valve is equipped with a rack and pinion structure 23, and the motor is correspondingly equipped with a gear structure 31, with the gear 31 meshing with the rack and pinion 23. In this way, the motor can control the rotation of the valve through the transmission of the gear 31 and rack and pinion 23, thereby adjusting the valve opening. This configuration improves the self-locking capability of the motor and valve through the connection structure of the gear 31 and rack and pinion 23, thus preventing the valve from loosening and achieving the effect of keeping the air volume supplied to the room constant at a preset air volume.

[0041] like Figures 1 to 5 As shown, this disclosure provides a valve assembly for a fresh air unit, comprising: a valve body 10, a damper 20, and a drive motor 30. The valve body 10 is provided with a ventilation hole 11; the damper 20 includes a valve plate 21 and a connecting plate 22, the valve plate 21 being rotatably disposed at the ventilation hole 11 via a rotating shaft 12, the connecting plate 22 being fixedly disposed on the side wall of the valve plate 21, and the side wall of the connecting plate 22 being provided with a rack 23; the drive motor 30 includes a drive shaft provided with a gear 31, the gear 31 being meshed with the rack 23; wherein, the drive shaft is used to drive the gear 31 to rotate, so as to drive the connecting plate 22 to move around the rotating shaft 12 of the valve plate 21 via the rack 23, thereby driving the valve plate 21 to rotate around the rotating shaft 12 to block or unblock the ventilation hole 11 of the valve body 10.

[0042] Specifically, the fresh air unit includes a casing, and a valve assembly is disposed within the casing. The valve body 10 has ventilation holes 11 to allow airflow between the interior of the casing and the external environment. The damper 20 includes a valve plate 21 and a connecting plate 22. The valve plate 21 and connecting plate 22 can be integrally formed or separate structures. If the valve plate 21 and connecting plate 22 are separate structures, the connecting plate 22 needs to be fixed to the valve plate 21 through welding or other processes. The valve plate 21 has rotating shafts 12 at both ends. The valve plate 21 is rotatably positioned at the ventilation holes 11 of the valve body 10 via the rotating shafts 12, and the diameter of the valve plate 21 is equal to the diameter of the ventilation holes 11. The valve plate 21 can rotate around the rotating shafts 12 in a first direction to a position perpendicular to the ventilation holes 11 to block the ventilation holes 11, or it can rotate in a second direction to a position parallel to the ventilation holes 11 to clear the ventilation holes 11, wherein the first and second directions are opposite. A connecting plate 22 is disposed on the inner wall of the valve plate 21, and the connecting plate 22 is perpendicular to the valve plate 21. A rack 23 is disposed on the connecting side wall, and the rack 23 is disposed in a direction perpendicular to the rotation axis of the valve plate 21. A drive shaft is disposed on the side of the drive motor 30 facing the rack 23, and a gear 31 is disposed on the drive shaft corresponding to the rack 23, and the gear 31 and the rack 23 are meshed together. In this way, the drive motor 30 can drive the gear 31 to rotate through the drive shaft, so that the gear 31 drives the connecting plate 22 to move through the rack 23, thereby driving the valve plate 21 to rotate around the rotation axis 12 in a first direction or a second direction.

[0043] When the fresh air unit is shut down, the valve plate 21 is in a position perpendicular to the ventilation hole 11, thus blocking the ventilation hole 11. If the user needs air supply through the fresh air unit, the drive motor 30 drives the valve plate 21 to rotate in the second direction via the connecting plate 22, creating a gap between the valve plate 21 and the ventilation hole 11 and clearing the ventilation hole 11. If the user needs to stop the air supply, the drive motor 30 drives the valve plate 21 to rotate in the first direction via the connecting plate 22, so that the valve plate 21 returns to the position perpendicular to the ventilation hole 11 and blocks the ventilation hole 11. This configuration improves the self-locking capability of the motor and valve through the connection structure of the gear 31 and rack 23, thereby preventing the valve from loosening and achieving the effect of keeping the air supply to the room constant at the preset air supply volume.

[0044] Understandably, existing solutions that directly drive the valve plate 21 via a motor rely solely on the motor's own magnetic reluctance to maintain torque. Under the impact of airflow, the valve plate 21 is prone to misalignment, leading to inaccurate opening. This application, however, generates a normal force component through the inclined meshing of gear 31 and rack 23, forming a self-locking torque to resist airflow. Furthermore, in existing solutions, the motor step angle error is directly transmitted to the valve plate 21; for example, a 0.9° stepper motor results in an opening error of ±1°. This application optimizes the transmission ratio of gear 31 and rack 23, thereby reducing the motion error of the valve plate 21 and achieving precise control. In summary, the gear 31 and rack 23 transmission of this application, through mechanical self-locking and error reduction mechanisms, fundamentally solves the problems of loosening, misalignment, and control lag inherent in traditional direct-drive valve plates 21.

[0045] In practical applications, when the valve plate 21 clears the ventilation hole 11, the drive motor 30 can also drive the valve plate 21 to rotate in the first or second direction to control the angle between the valve plate 21 and the ventilation hole 11, that is, to adjust the opening of the valve plate 21, thereby adjusting the air volume of the fresh air unit. For example, when the user needs a larger air volume, the drive motor 30 drives the valve plate 21 to rotate in the second direction to a position parallel to the ventilation hole 11, so that the opening of the valve plate 21 reaches its maximum; when the user needs a smaller air volume, the drive motor 30 drives the valve plate 21 to rotate in the first direction to an angle inclined to the ventilation hole 11. At this time, the gap between the valve plate 21 and the ventilation hole 11 becomes smaller, so as to reduce the height of the valve plate 21, thereby achieving the effect of reducing the air volume.

[0046] In the above embodiment, the inner wall surface of the valve plate 21 refers to the wall surface of the valve plate 21 facing the inside of the housing when the air valve assembly is installed in the housing and the valve plate 21 blocks the ventilation hole 11. That is, the connecting plate 22 and the drive motor 30 are located on the side of the valve plate 21 closer to the inside of the housing. This arrangement allows the connecting plate 22 and the drive motor 30 to be covered by the valve plate 21, which not only improves the overall aesthetics of the air valve assembly but also extends its service life.

[0047] In this application, valve plate 21 being perpendicular to ventilation hole 11 means that the opening degree of valve plate 21 is 0°, that is, valve plate 21 is in a completely closed state. Valve plate 21 being parallel to ventilation hole 11 means that the opening degree of valve plate 21 is 90°, that is, valve plate 21 is in a completely open state.

[0048] like Figure 3 As shown, in some embodiments, the rack 23 is configured as a fan-shaped annular structure, and the center of the rack 23 is located on the rotation axis of the valve plate 21.

[0049] Specifically, the rack 23 is a curved, fan-shaped ring, and it is coaxially arranged with the shaft 12 of the valve plate 21. Thus, when the drive shaft of the drive motor 30 drives the gear 31 to rotate, the gear 31 can drive the rack 23 to rotate around the shaft 12 of the valve plate 21. At this time, the connecting plate 22 rotates along with the rack 23 around the shaft 12 of the valve plate 21, thereby causing the valve plate 21 to rotate synchronously around its shaft 12 to adjust the opening of the valve plate 21. This arrangement prevents the gear 31 and rack 23 from disengaging during the movement of the valve plate 21 by the drive motor 30, improving the reliability of the valve assembly.

[0050] like Figure 3 As shown, in some embodiments, the connecting plate 22 is configured as a fan-shaped or fan-ring structure, and the connecting plate 22 and the rack 23 are concentrically arranged; wherein the radius of the connecting plate 22 is greater than or equal to the outer radius of the rack 23.

[0051] Specifically, the connecting plate 22 is configured as a fan-shaped or fan-ring structure corresponding to the shape of the rack 23 to improve the stability of the transmission. The connecting plate 22 and the rack 23 are concentrically arranged, and the radius of the connecting plate 22 is greater than or equal to the outer radius of the rack 23, so as to protect the rack 23 through the connecting plate 22.

[0052] In the above embodiments, if the connecting plate 22 is configured as a fan-shaped ring, the radius of the connecting plate 22 refers to the outer radius of the connecting plate 22.

[0053] Optionally, the connecting plate 22 is configured as a semi-circular or semi-annular structure to facilitate the machining of the connecting plate 22 and the valve plate 21.

[0054] like Figure 3 As shown, in some embodiments, the central angle of the rack 23 is greater than or equal to a preset angle.

[0055] Specifically, the drive motor 30 rotates via the drive gear 31, and through the rack 23, drives the connecting plate 22 and the valve plate 21 to rotate. Therefore, the larger the central angle of the rack 23, the larger the angle that the valve plate 21 can rotate; the smaller the central angle of the rack 23, the smaller the angle that the valve plate 21 can rotate. Therefore, by making the central angle of the rack 23 greater than or equal to a preset angle, the adjustment range of the valve plate 21 opening can be increased.

[0056] In practical applications, the central angle of rack 23 is greater than or equal to 60°. For example, the central angle of rack 23 can be 60°, 70°, 80° or 90°.

[0057] Optionally, the connecting plate 22 is also provided with a guide groove 24. The guide groove 24 is located on the side of the rack 23 away from the valve plate 21, and the shape of the guide groove 24 corresponds to the shape of the rack 23. That is, if the rack 23 is a fan-shaped ring, then the guide groove 24 is also a fan-shaped ring. The central angle between the guide groove 24 and the rack 23 is greater than or equal to the central angle of the rack 23, and the guide groove 24 and the rack 23 are concentrically arranged. The gear 31 is provided with a guide post 32 corresponding to the guide groove 24. The guide post 32 is embedded in the guide groove 24 so that the guide post 32 slides along the guide groove 24.

[0058] like Figure 1 As shown, in some embodiments, the fresh air unit includes a control device; the air valve assembly further includes a wind speed sensor. The wind speed sensor is disposed at the ventilation hole 11 and is used to obtain the air flow rate at the ventilation hole 11; wherein, the control device is electrically connected to the wind speed sensor and the drive motor 30 respectively; when the valve plate 21 clears the ventilation hole 11, the control device is used to control the opening degree of the valve plate 21 according to the air flow rate at the ventilation hole 11.

[0059] Specifically, a wind speed sensor is installed at the ventilation hole 11. When the valve plate 21 clears the ventilation hole 11, the wind speed sensor is used to obtain the airflow velocity at the ventilation hole 11 in real time and send the airflow velocity signal to the control device. After receiving the airflow velocity signal, the control device controls the drive motor 30 to rotate the valve plate 21 according to the airflow velocity, so as to adjust the opening of the valve plate 21. With this setting, the accuracy of the airflow volume blown into the room can be further ensured through the cooperation of the valve plate 21 and the real-time wind speed. For example, when the user needs to increase the air supply volume and the airflow velocity at the ventilation hole 11 is large, the control device controls the drive motor 30 to rotate slowly to gradually increase the opening of the valve plate 21, thereby gradually increasing the air supply volume; when the user needs to decrease the air supply volume and the airflow velocity at the ventilation hole 11 is large, the control device controls the drive motor 30 to rotate the valve plate 21 slowly to gradually decrease the opening of the valve plate 21, thereby gradually decreasing the air supply volume. Similarly, when the user needs to increase the air supply and the air velocity in the ventilation hole 11 is low, the control device controls the drive motor 30 to drive the valve plate 21 to rotate quickly in order to quickly reach the preset air supply volume.

[0060] In some embodiments, the opening degree of the valve plate 21 is inversely proportional to the air velocity at the ventilation hole 11.

[0061] Specifically, when the fresh air unit supplies air to the room at a constant volume, the opening of the valve plate 21 is inversely proportional to the air velocity at the ventilation hole 11; that is, the higher the air velocity at the ventilation hole 11, the smaller the opening of the valve plate 21. For example, if the air velocity at the ventilation hole 11 increases, the control device controls the drive motor 30 to rotate the valve plate 21 in the first direction to decrease the opening; if the air velocity at the ventilation hole 11 decreases, the control device controls the drive motor 30 to rotate the valve plate 21 in the second direction to increase the opening. This configuration allows the valve plate 21 to be adjusted to accommodate different air velocities, ensuring a constant air volume from the fresh air unit.

[0062] In practical applications, the specific proportional relationship between the opening degree of valve plate 21 and the air velocity at the ventilation hole 11 can be determined according to the user's actual needs. For example, under the condition of constant air supply volume, if the air velocity increases by 30%, the opening degree of valve plate 21 decreases by 30%; if the air velocity decreases by 60%, the opening degree of valve plate 21 increases by 60%.

[0063] like Figure 1 and Figure 2 As shown, in some embodiments, the inner wall of the ventilation hole 11 is provided with a mounting groove 13, and the mounting groove 13 is provided with a snap-fit ​​part; the drive motor 30 is provided with a snap-fit ​​mating part corresponding to the snap-fit ​​part; wherein, the drive motor 30 is installed in the mounting groove 13, and the snap-fit ​​mating part can snap onto the snap-fit ​​part.

[0064] Specifically, the inner wall of the ventilation hole 11 is provided with a mounting groove 13. The size and shape of the mounting groove 13 are set to correspond to the drive motor 30, and a snap-fit ​​part is provided in the mounting groove 13. The drive motor 30 is installed in the mounting groove 13, and the snap-fit ​​part of the drive motor 30 can snap into the snap-fit ​​mating part of the mounting groove 13 to fix the drive motor 30 in the mounting groove 13.

[0065] like Figure 1 and Figure 2 As shown, in some embodiments, the rotating shaft 12 of the valve plate 21 is connected to the inner wall of the ventilation hole 11 in a horizontal direction so that the valve plate 21 can rotate in a vertical plane; the mounting groove 13 is provided corresponding to the upper half or the lower half of the valve plate 21; wherein, the movement direction of the half of the valve plate 21 corresponding to the drive motor 30 is limited to moving away from the drive motor 30.

[0066] Specifically, the rotating shaft 12 of the valve plate 21 is horizontally connected to the inner wall of the ventilation hole 11, and the mounting groove 13 is provided corresponding to the upper or lower half of the valve plate 21, that is, the inner wall of the upper or lower half of the ventilation hole 11 is provided with the mounting groove 13. After the drive motor 30 is installed in the mounting groove 13, the drive motor 30 can also be fastened in the mounting groove 13 by bolts or screws or other fasteners. At this time, the drive motor 30 is located at the position corresponding to the upper or lower half of the valve plate 21. In this way, when the drive motor 30 drives the valve plate 21 to rotate in the second direction, the half of the valve plate 21 corresponding to the drive motor 30 rotates away from the drive motor 30, that is, rotates outward, so as to avoid interference between the drive motor 30 and the mounting groove 13 on the rotation of the valve plate 21. For example, when the drive motor 30 is positioned corresponding to the upper half of the valve plate 21, the second direction is defined as the upper half of the valve plate 21 rotating outward; when the drive motor 30 is positioned corresponding to the lower half of the valve plate 21, the second direction is defined as the lower half of the valve plate 21 rotating outward.

[0067] Optionally, a buckle 14 is provided on one side wall of the mounting groove 13, and the wind speed sensor can be snapped into the buckle 14 to fix the wind speed sensor to the inner wall of the ventilation hole 11.

[0068] like Figures 1 to 5 As shown in the illustration, this disclosure also provides a fresh air unit comprising: a housing and the aforementioned air valve assembly for the fresh air unit. The housing is provided with an air outlet; the air valve assembly is installed at the air outlet of the housing.

[0069] Specifically, the casing may be provided with at least one air outlet to form an air supply outlet. The fresh air unit blows fresh air into the room through the air supply outlet. The air valve assembly is installed at the air supply outlet of the casing to adjust the air supply volume. The fresh air unit using the air valve assembly for the fresh air unit provided in this application can improve the self-locking capability of the motor and valve through the connection structure of gear 31 and rack 23, thereby avoiding valve loosening and achieving the effect of keeping the air supply volume to the room constant at the preset air supply volume.

[0070] In some embodiments, the fresh air unit further includes: a fan. The fan is disposed within a housing; a control device electrically connected to both the fan and the damper assembly; wherein the control device is used to control the opening degree of the valve plate 21 of the damper assembly according to the fan speed.

[0071] Specifically, the fan is installed inside the casing and is used to blow fresh air into the room through the casing's air vents. A control device is electrically connected to the fan to control its rotational speed, thereby adjusting the airflow velocity at the air vents. When the fan speed is high, the control device reduces the opening of the control valve plate 21 to maintain a constant airflow while increasing the airflow velocity; when the fan speed is low, the control device increases the opening of the control valve plate 21 to maintain a constant airflow while decreasing the controlled airflow velocity.

[0072] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A valve assembly for a fresh air system, characterized in that, include: The valve body is equipped with ventilation holes; A damper includes a valve plate and a connecting plate. The valve plate is rotatably mounted at the ventilation hole via a pivot, and the connecting plate is fixedly mounted on the side wall of the valve plate. The side wall of the connecting plate is provided with a toothed rack. A drive motor includes a drive shaft with a gear, the gear being meshed with the rack; The drive shaft is used to drive the gear to rotate, so as to drive the connecting plate to move around the valve plate's pivot axis via the rack, thereby causing the valve plate to rotate around the pivot axis to block or clear the ventilation holes of the valve body.

2. The damper assembly according to claim 1, characterized in that, The rack is configured as a fan-shaped ring structure, and the center of the rack is located on the rotation axis of the valve plate.

3. The damper assembly according to claim 2, characterized in that, The connecting plate is configured as a fan-shaped or fan-ring structure, and the connecting plate and the rack are concentrically arranged. The radius of the connecting plate is greater than or equal to the outer radius of the rack.

4. The damper assembly according to claim 2, characterized in that, The central angle of the rack is greater than or equal to a preset angle.

5. The damper assembly according to claim 1, characterized in that, The fresh air unit includes a control device; The damper assembly also includes: A wind speed sensor is installed at the ventilation hole to obtain the airflow speed at the ventilation hole; The control device is electrically connected to the wind speed sensor and the drive motor respectively; When the valve plate clears the ventilation hole, the control device is used to control the opening degree of the valve plate according to the air flow rate at the ventilation hole.

6. The damper assembly according to claim 5, characterized in that, The opening degree of the valve plate is inversely proportional to the air velocity at the ventilation hole.

7. The damper assembly according to any one of claims 1 to 6, characterized in that, The inner wall of the ventilation hole is provided with a mounting groove, and the mounting groove is provided with a snap-fit ​​part; and, The drive motor is provided with a snap-fit ​​part corresponding to the snap-fit ​​part; The drive motor is installed in the mounting slot, and the snap-fit ​​part can snap into the snap-fit ​​part.

8. The damper assembly according to claim 7, characterized in that, The valve plate's pivot is horizontally connected to the inner wall of the ventilation hole, allowing the valve plate to rotate in a vertical plane; and, The mounting groove is provided corresponding to the upper or lower half of the valve plate; The direction of movement of the half of the valve plate corresponding to the drive motor is limited to moving away from the drive motor.

9. A fresh air purifier, characterized in that, include: The casing is equipped with air vents; and, The air valve assembly for a fresh air unit as described in any one of claims 1 to 8 is installed at the air outlet of the housing.

10. The fresh air system according to claim 9, characterized in that, Also includes: The fan is installed inside the casing; and, The control device is electrically connected to both the fan and the valve assembly. The control device is used to control the opening degree of the valve plate of the air valve assembly according to the rotational speed of the fan.

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