Head-mounted display device and control method

Abstract

The application relates to the technical field of wearable devices, and particularly discloses a head-mounted display device which comprises a device main body and a fan. The fan comprises a casing and a plurality of fan blades. The plurality of fan blades are arranged in the casing, the casing is provided with an air inlet and an air outlet, and the position of the casing at the air outlet is respectively provided with a vortex tongue and a guide vane. The guide vane is swingably arranged in the casing and can be locked at different angles of a preset swing stroke. When the extension line of the guide vane is aligned with the gap between the blade tails of two fan blades, the extension line of the guide vane is aligned with the blade tail of one fan blade in the locked state of the guide vane. The head-mounted display device provided by the application can meet different heat dissipation requirements of the head-mounted display device and ensure that the operation noise of the fan is low. In addition, under different rotating speeds of the fan, the angle of the guide vane can be adjusted to make the airflow uniform, the air outlet of the fan is more uniform, and the heat dissipation effect is better. The application also discloses a control method of the head-mounted display device, which also has the above technical effects.

Description

Technical Field

[0001] This invention relates to the field of wearable device technology, and more specifically, to a head-mounted display device and its control method. Background Technology

[0002] Air cooling is a common heat dissipation method, and centrifugal fans are the core components of air-cooled systems. A centrifugal fan generally consists of blades, a shaft, and a casing. The casing mainly includes the volute, inlet, and vortex. When airflow passes near the vortex, it is split in two: most of the airflow flows to the fan outlet, while a smaller portion flows back to the volute through the gap between the vortex and the impeller. Within the volute, the airflow rotates once with the impeller before returning to the vortex to participate in a new split. The vortex prevents gas from circulating within the volute, thus improving flow efficiency. However, the vortex is also a significant component affecting noise levels.

[0003] As electronic products face increasingly stringent noise standards for fans, optimizing fan noise is gaining attention. Currently, fan noise reduction primarily involves improving the volute, refining the fan profile, and designing the fan blades. For example, adjusting the volute position to optimize the airflow angle can reduce noise, but this adjustment results in significant mechanical structural changes, potentially causing air leakage. Furthermore, conventional noise reduction methods struggle to meet the noise reduction requirements of fans at different speeds. Head-mounted displays, with their stringent noise reduction requirements, often employ heat dissipation via cold plates, making conventional air-cooling methods unsuitable for their application. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a head-mounted display device and a control method thereof, which can effectively solve the problem that conventional noise reduction methods are difficult to use in head-mounted display devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A head-mounted display device includes a main body and a fan disposed on the main body. The fan includes a housing and a plurality of rotatable fan blades disposed within the housing. The housing has an air inlet and an air outlet. The housing has a vortex and a guide vane respectively located at the air outlet. The guide vane is oscillatingly disposed on the housing and can be locked at different angles of a preset oscillation stroke. When the guide vane is locked, the extension line of the guide vane is aligned with the blade tip of one of the fan blades, and the extension line of the vortex is aligned with the gap between the blade tips of two fan blades.

[0007] Optionally, in the above-mentioned head-mounted display device, the guide vane includes a base and a blade disposed on the base, the housing is provided with a fan-shaped hole, the base is disposed outside the housing, and the blade passes through the fan-shaped hole and can swing within the fan-shaped hole.

[0008] Optionally, in the above-mentioned head-mounted display device, the blade is flush with or extends beyond the corresponding edge of the fan blade along any one end edge of the fan blade along the axial direction.

[0009] Optionally, in the above-mentioned head-mounted display device, the blade is flat.

[0010] Optionally, in the above-mentioned head-mounted display device, the vortex tongue and the guide vane are respectively located in the low-speed air outlet area of ​​the air outlet.

[0011] Optionally, in the above-mentioned head-mounted display device, the preset swing stroke is in the range of 30°-120° with the end face of the air outlet.

[0012] Optionally, the head-mounted display device described above further includes a driving component, which is disposed in the housing and its output end is connected to the guide vane to drive the guide vane to swing.

[0013] Alternatively, the driving component may include a telescopic cylinder or a linear motor, the output end of which is connected to a rack, and the guide vane is coaxially connected to a gear, with the rack meshing with the gear.

[0014] Optionally, in the above-mentioned head-mounted display device, the driving component includes a motor, and the drive shaft of the motor is connected to the guide vane.

[0015] The head-mounted display device provided by this invention includes a main body and a fan. The fan includes a housing and multiple fan blades. The multiple fan blades are disposed within the housing, which has an air inlet and an air outlet. A vortex and a guide vane are respectively located at the air outlet position on the housing. The guide vane is oscillatingly disposed within the housing and can be locked at different angles within a preset oscillation stroke. When the guide vane is locked, if the extension line of the guide vane is aligned with the tip of one fan blade, the extension line of the vortex is aligned with the gap between the tips of two fan blades.

[0016] The head-mounted display device provided by this invention includes a fan that works in conjunction with the main body of the device. Driven by the fan, airflow carries away heat from the main body of the device, achieving active heat dissipation. Furthermore, the fan speed can be adjusted according to the heat dissipation requirements of the main body to meet different heat dissipation needs. Additionally, by oscillating the fan guide vanes within the housing, when the guide vanes are locked and their extension lines are aligned with the tip of one fan blade, the extension lines of the vortex tongue are aligned with the gap between the tips of two fan blades. Since the noise frequency generated by the fan blades differs from the noise frequency generated by the gap between the fan blades, this phase difference allows the two noise sources to superimpose, thus canceling out the noise. In other words, the guide vanes and vortex tongue work together to reduce fan noise. Simultaneously, because the angle of the guide vanes is adjustable, it can be adjusted to better match the fan speed during operation at different speeds, ensuring low operating noise at various speeds and meeting the different heat dissipation requirements of the head-mounted display device while maintaining low noise levels. In addition, by adjusting the angle of the guide vanes at different fan speeds, airflow can be evenly distributed, preventing backflow caused by low-pressure areas of the fan. The guide vanes and vortex tongue work together to make the fan airflow more even and the heat dissipation effect better.

[0017] To achieve the above objectives, the present invention also provides the following technical solution:

[0018] A control method for a head-mounted display device, used in any of the aforementioned head-mounted display devices, the control method comprising:

[0019] Receive fan speed commands;

[0020] The fan is controlled to run at the corresponding speed. Based on the pre-stored relationship between different guide vane angles corresponding to different speeds, the guide vane is controlled to swing to the angle corresponding to the current speed and then locked.

[0021] Optionally, in the above-described fan control method, controlling the guide vanes to swing to an angle corresponding to the current rotational speed and locking them specifically includes:

[0022] Determine whether the current rotational speed corresponds to a pre-stored rotational speed value in the relationship between different guide vane angles corresponding to different rotational speeds;

[0023] If so, control the guide vane to swing to the guide vane angle corresponding to the rotation speed value and lock it;

[0024] Otherwise, based on the current rotational speed and the pre-stored relationship between different guide vane angles corresponding to different rotational speeds, the target guide vane angle corresponding to the current rotational speed is calculated, and the guide vane is controlled to swing to the target guide vane angle and locked.

[0025] Optionally, in the control method of the above-mentioned head-mounted display device, calculating the target guide vane angle corresponding to the current rotation speed, controlling the guide vane to swing to the target guide vane angle and locking it, specifically includes:

[0026] Calculate the change in rotational speed;

[0027] Based on the change in rotational speed and the relationship between different guide vane angles corresponding to different rotational speeds, the change in guide vane angle and the target guide vane angle corresponding to the current rotational speed are calculated.

[0028] Determine whether the change in the guide vane angle is not less than a preset deviation;

[0029] If so, control the guide vane to swing to the target guide vane angle and lock it;

[0030] Otherwise, maintain the current guide vane angle.

[0031] Optionally, the control method for the head-mounted display device described above further includes:

[0032] Test the noise level of the fan at different speeds and the guide vanes locked at different angles within a preset swing stroke.

[0033] The relationship between different guide vane angles corresponding to different speeds is established and stored based on the guide vane angles corresponding to the lower noise values ​​of the fan at different speeds.

[0034] The control method for head-mounted display devices provided by this invention controls the fan rotation according to the heat generation of the device body, and controls the guide vanes to swing to an angle corresponding to the current rotation speed and lock them in place. This means the guide vanes can adaptively adjust. When the fan operates at different speeds according to the different heat dissipation needs of the head-mounted display device, the angle of the guide vanes is adjusted to better match the fan speed. Furthermore, when the extension line of the guide vanes is aligned with the tip of one fan blade, the extension line of the vortex tongue is aligned with the gap between the tips of two fan blades. Since the noise frequency generated by the fan blades is different from the noise frequency of the gap between the fan blades, this phase difference allows the two noise sources to superimpose, thus canceling out the noise. Therefore, the fan can maintain low operating noise at different speeds, meeting the different heat dissipation needs of the head-mounted display device while ensuring low noise. In addition, adjusting the angle of the guide vanes at different speeds can evenly distribute airflow and prevent backflow caused by low-pressure areas of the fan. The cooperation between the guide vanes and the vortex tongue makes the fan airflow more uniform and the heat dissipation effect better. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the front view structure of a fan in a wearable device according to a specific embodiment of the present invention;

[0037] Figure 2 for Figure 1 Perspective view;

[0038] Figure 3 for Figure 1 A 3D schematic diagram of the central fan;

[0039] Figure 4 for Figure 3 Another perspective illustration;

[0040] Figure 5 This is a diagram illustrating the noise level of a fan.

[0041] Figure 6 This is a flowchart of a control method for a head-mounted display device according to a specific embodiment of the present invention;

[0042] Figure 7 This is a flowchart of a control method for a head-mounted display device according to another specific embodiment of the present invention.

[0043] The following labels are shown in the attached diagram:

[0044] 1. Housing, 11. Air outlet, 12. Fan-shaped hole, 2. Fan blade, 3. Guide vane, 31. Base, 32. Blade, 4. Vortex, 5. Drive component, 51. Detailed Implementation

[0045] This invention discloses a head-mounted display device and its control method, which can meet the different heat dissipation requirements of the head-mounted display device and keep the fan noise low.

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] The head-mounted display devices provided in this application include, but are not limited to, augmented reality head-mounted devices, virtual reality head-mounted devices, and mixed reality head-mounted devices. This application utilizes a special fan design to reduce noise, enabling its application in head-mounted display devices. For the structure of the head-mounted display device's main body, please refer to existing technologies. It is understood that the housing of the head-mounted display device can be configured with air ducts to cooperate with the fan, as needed, for better airflow. The following embodiments primarily describe the structure of the fan.

[0048] In one embodiment, see Figures 1-4 The head-mounted display device provided by this invention includes a main body and a fan. The fan includes a housing 1 and multiple fan blades 2. The multiple fan blades 2 are rotatably disposed within the housing 1. The housing 1 has an air inlet and an air outlet 11. The specific shape of the housing 1 and the shape of the fan blades 2 can be referenced to the configuration of a conventional fan, and will not be described in detail here. It should be noted that the housing 1 can be a component independent of the main body of the device, or it can be part of the housing of the main body. The housing 1 has a vortex 4 and a guide vane 3 respectively located at the air outlet 11. The vortex 4 can be formed by the wall of the housing 1, and its position and structure can be referenced to the configuration of the vortex 4 of a conventional fan. The guide vane 3 is oscillatingly disposed on the housing 1 and can be locked at different angles within a preset oscillation stroke. That is, the guide vane 3 can oscillate relative to the housing 1 within the preset oscillation stroke range and can be locked at different angles within the preset oscillation stroke range. Specifically, it can be locked at consecutive different angles within the preset oscillation stroke range, or it can be locked at intervals of different angles within the preset oscillation stroke range. Furthermore, the guide vane 3, in each locked angle state, such as... Figure 2 As shown, when the extension line of guide vane 3 is aligned with the tip of one fan blade 2, the extension line of vortex tongue 4 is aligned with the gap between the tips of the two fan blades 2, and vice versa. That is, when the extension line of vortex tongue 4 is aligned with the tip of one fan blade 2, the extension line of guide vane 3 is aligned with the gap between the tips of the two fan blades 2. Noise is generated at the guide vane 3 and vortex tongue 4. Since the noise frequency generated by fan blade 2 is different from the noise frequency generated by the gap between fan blades 2, this phase difference allows the two noise sources to superimpose, thus canceling out the noise. Figure 5 As shown, there is a phase difference between the noise generated at the position of fan blade 2 (first sound source) and the noise generated by the gap between fan blade 2 (second sound source). Therefore, during the rotation of fan blade 2, the noise sources cancel each other out due to the always-present phase difference, thus effectively reducing the noise of the fan.

[0049] The head-mounted display device provided by this invention includes a fan that works in conjunction with the main body of the device. Driven by the fan, airflow carries away heat from the main body of the device, achieving active heat dissipation. Furthermore, the fan speed can be adjusted according to the heat dissipation requirements of the main body to meet different heat dissipation needs. Additionally, by oscillating the fan guide vanes 3 within the housing 1, and with the guide vanes 3 working in conjunction with the vortex tongue 4, fan noise is reduced. Simultaneously, since the angle of the guide vanes 3 is adjustable, it can be adjusted to better match the fan speed at different operating speeds, ensuring low operating noise at various speeds and meeting the different heat dissipation needs of the head-mounted display device while maintaining low noise. Moreover, adjusting the angle of the guide vanes 3 at different fan speeds can evenly distribute airflow, preventing backflow caused by low-pressure areas. The combination of the guide vanes 3 and the vortex tongue 4 makes the fan output more uniform and improves heat dissipation. Furthermore, this fan has no unnecessary structural components, which helps to reduce its size.

[0050] In some embodiments, the guide vane 3 includes a base 31 and a blade 32 disposed on the base 31. The housing 1 has a fan-shaped hole 12. The base 31 is located outside the housing 1, and the blade 32 passes through the fan-shaped hole 12 and can swing within the fan-shaped hole 12. On the one hand, the fan-shaped hole 12 limits the maximum swing range of the blade 32. On the other hand, the base 31 is located on the outer wall of the housing 1, which facilitates driving the blade 32 to swing from outside the housing 1, avoiding impact on the internal structure of the air outlet 11. The angle of the fan-shaped hole 12 can be set according to the preset swing stroke, and is not specifically limited here. In other embodiments, the guide vane 3 may also include a blade 32 and a rotating shaft connected to the blade 32. The rotating shaft passes through the housing 1, and the blade 32 swings by driving the rotating shaft to rotate.

[0051] In some embodiments, the blade 32 has either an edge at one end of the fan blade 2 that is flush with or extends beyond the corresponding edge of the fan blade 2 along its axial direction. That is, the blade 32 has either an edge at one end of the fan blade 2 that is flush with or extends beyond the corresponding edge of the fan blade 2 along its axial direction. This includes both ends of the blade 32 having edges flush with the axial edges of the fan blade 2, and ends of the blade 32 extending beyond the axial edges of the fan blade 2. It also includes one end of the blade 32 having an edge flush with the corresponding edge of the fan blade 2 along its axial direction, and the other end of the blade 32 extending beyond the corresponding edge of the fan blade 2 along its axial direction. With this configuration, the blade 32 can cover the area of ​​the fan blade 2, thus providing good airflow guidance and wind cutting within the axial range of the fan blade 2. Specifically, one end of the blade 32 extends beyond the corresponding edge of the fan blade 2 along the axial direction, while the other end is flush with it. This not only provides good airflow guidance and wind cutting, but also makes it easier to install the longer end of the blade 32, and the overall structure occupies less space.

[0052] In some embodiments, the blade 32 is flat. This design is simple and provides good airflow guidance and cutting. Furthermore, the flat blade 32 facilitates control of its angle relative to the fan blade 2, allowing for adjustment of the blade 32 angle according to different fan speeds. In other embodiments, the blade 32 may also be arc-shaped, in which case the extension line of the guide vane points to the extension line along the tangent direction of the end of the blade 32 closest to the fan blade 2.

[0053] In some embodiments, the swing axis of the guide vane 3 is parallel to the rotation axis of the fan blade 2. This allows the guide vane 3 to better match the different rotational speeds of the fan blade 2 when swinging to different angles, and the above configuration facilitates the assembly and driving of the guide vane 3.

[0054] In some embodiments, the vortex tongue 4 and the guide vane 3 are respectively located in the low-speed air outlet area of ​​the air outlet 11 to better uniformly distribute the airflow of the fan and reduce the fan noise generated by the interaction between the fan and the vortex tongue 4 and the guide vane 3.

[0055] In some embodiments, the preset swing stroke is within the range of 30°-120° with the end face of the air outlet 11, that is, the guide vane 3 can swing within the range of 30°-120° with the end face of the air outlet 11. Figure 1 In the indicated state, the preset swing stroke is within the range of 30°-120° angle with the horizontal direction. Setting the preset swing stroke within this range can reduce noise and even out the airflow when working with the vortex tongue 4, while preventing airflow backflow or even obstruction.

[0056] In some embodiments, the head-mounted display device further includes a driving component 5, which is disposed in the housing 1 and whose output end is connected to the guide vane 3 to drive the guide vane 3 to swing. By driving the guide vane 3 to swing through the driving component 5, automatic adjustment of the guide vane 3 is achieved. Furthermore, the driving component 5 can lock the guide vane 3 at different angles within a preset swing stroke. Specifically, the driving component 5 is connected to a fan control device, which controls the operation of the driving component 5 according to the fan speed to adjust the angle of the guide vane 3.

[0057] In some embodiments, the drive component 5 includes a motor, and the drive shaft 51 of the motor is connected to the guide vane 3. Specifically, the guide vane 3 can be directly connected to the drive shaft 51 of the motor, in which case the torque output by the motor directly drives the guide vane 3 to oscillate. Alternatively, the guide vane 3 can also be indirectly connected to the drive shaft 51 of the motor, such as through a reduction gear, gear set, or other transmission components, to achieve precise control of the angle of the guide vane 3 and reduce the limitation on the installation space of the motor.

[0058] In some embodiments, the drive component 5 includes a telescopic cylinder or a linear motor. A rack is connected to the output end of the telescopic cylinder or linear motor, and a gear is coaxially connected to the guide vane 3, with the rack meshing with the gear. In the above embodiments, the drive component 5 uses a torque output device. This embodiment differs from the previous one in that the drive component 5 uses a linear drive device, specifically a telescopic cylinder such as a cylinder, pneumatic rod, or hydraulic cylinder, or a linear motor. The output end of the telescopic cylinder or linear motor drives the rack to move linearly, thereby causing the gear to rotate. The gear is coaxially connected to the guide vane 3, thus causing the guide vane 3 to swing accordingly. It is understood that the gear here can be a separate part connected to the guide vane 3, or it can be a part of the guide vane 3, i.e., teeth are provided in a portion of the guide vane 3 to mesh with the rack. When the guide vane 3 includes a base 31 and a blade 32, at least a portion of the outer circumferential surface of the base 31 can be set as an arc surface, and teeth can be provided on the arc surface to form the aforementioned gear. The shape of the gear can be set accordingly based on the swing range of the guide vane 3, i.e., the preset swing stroke. If the guide vane 3 swings within a 90° range, the corresponding gear can also be configured with a tooth structure within a 90° range. Using this structure, the transmission is reliable, and the gear and rack combination provides high transmission accuracy, facilitating precise adjustment of the guide vane 3's swing angle.

[0059] In some embodiments, the fan is a forward-curved multi-blade fan, meaning that the bending direction of the fan blades 2 is consistent with the direction of airflow. Forward-curved multi-blade fans are more likely to achieve the target air volume and air delivery distance, while also being able to overcome greater system resistance.

[0060] Based on the head-mounted display device provided in the above embodiments, the present invention also provides a control method for the head-mounted display device, which can be used in any of the head-mounted display devices described in the above embodiments. Please refer to... Figure 6 The control method for the head-mounted display device includes the following steps:

[0061] S1: Receives fan speed commands;

[0062] S2: Control the fan to run at the corresponding speed, and according to the pre-stored guide vane angle relationship corresponding to different speeds, control the guide vane to swing to the angle corresponding to the current speed and lock it.

[0063] During operation of the head-mounted display device, the fan speed is adjusted according to the heat generated by the device body. Based on the real-time fan speed, the optimal guide vane angle corresponding to the current speed is determined from the pre-stored relationship between different guide vane angles for different speeds. The guide vane is then controlled to swing to this optimal guide vane angle and locked. If the fan has a drive component connected to the guide vane, a control signal is sent to the drive component. The drive component receives the control signal and drives the guide vane to swing to the corresponding angle. In this embodiment, during fan operation, the real-time angle of the guide vane is adjusted according to the fan's real-time speed. Specifically, the relationship between different guide vane angles for different speeds can be the guide vane angles corresponding to lower noise values ​​at different fan speeds, which can be established through pre-testing or simulation.

[0064] The control method for head-mounted display devices provided by this invention controls the fan rotation according to the heat generation of the device body, and controls the guide vanes to swing to an angle corresponding to the current rotation speed and lock them in place. This means the guide vanes can adaptively adjust. When the fan operates at different speeds according to the different heat dissipation needs of the head-mounted display device, the angle of the guide vanes is adjusted to better match the fan speed. Furthermore, when the extension line of the guide vanes is aligned with the tip of one fan blade, the extension line of the vortex tongue is aligned with the gap between the tips of two fan blades. Since the noise frequency generated by the fan blades is different from the noise frequency of the gap between the fan blades, this phase difference allows the two noise sources to superimpose, thus canceling out the noise. Therefore, the fan can maintain low operating noise at different speeds, meeting the different heat dissipation needs of the head-mounted display device while ensuring low noise. In addition, adjusting the angle of the guide vanes at different speeds can evenly distribute airflow and prevent backflow caused by low-pressure areas of the fan. The cooperation between the guide vanes and the vortex tongue makes the fan airflow more uniform and the heat dissipation effect better.

[0065] In some embodiments, step S2 above, controlling the guide vane to swing to an angle corresponding to the current rotational speed and locking it, specifically includes:

[0066] S21: Determine whether the current rotational speed corresponds to a rotational speed value in the pre-stored relationship between different guide vane angles corresponding to different rotational speeds;

[0067] S22: If so, control the guide vane to swing to the guide vane angle corresponding to the rotation speed value and lock it;

[0068] S23: Otherwise, based on the current rotational speed and the pre-stored relationship between different guide vane angles corresponding to different rotational speeds, calculate the target guide vane angle corresponding to the current rotational speed, control the guide vane to swing to the target guide vane angle and lock it.

[0069] In the relationship between different guide vane angles corresponding to different rotational speeds, where the rotational speed includes multiple discontinuous values ​​and corresponding guide vane angles for each speed, the system first determines whether the current rotational speed falls within any of the corresponding guide vane angle values. If so, the guide vane can be directly controlled to swing to the corresponding guide vane angle and locked based on the corresponding rotational speed value. That is, the guide vane angle corresponding to the read rotational speed value is taken as the optimal guide vane angle, and the guide vane is controlled to swing to the optimal guide vane angle and locked. If the current rotational speed does not fall within any of the corresponding guide vane angle values, the change in guide vane angle can be calculated using methods such as the difference method based on the change in a rotational speed value within the relationship between the current rotational speed and the corresponding guide vane angles. This allows the target guide vane angle corresponding to the current rotational speed to be obtained, and this target guide vane angle is then taken as the optimal guide vane angle. The guide vane is controlled to swing to the optimal guide vane angle and locked. In other embodiments, when the relationship between different guide vane angles corresponding to different rotational speeds is a functional relationship established through fitting or other methods, the corresponding target guide vane angle can be directly calculated based on the real-time rotational speed.

[0070] In some embodiments, the step S23 above, which calculates the target guide vane angle corresponding to the current rotational speed, controls the guide vane to swing to the target guide vane angle and locks it, specifically includes:

[0071] S231: Calculate the change in rotational speed;

[0072] S232: Based on the change in rotational speed and the relationship between different guide vane angles corresponding to different rotational speeds, calculate the change in guide vane angle and the target guide vane angle corresponding to the current rotational speed.

[0073] S233: Determine whether the change in guide vane angle is not less than the preset deviation;

[0074] S234: If so, control the guide vane to swing to the target guide vane angle and lock it;

[0075] S235: Otherwise, maintain the current guide vane angle.

[0076] To balance adjustment accuracy and work efficiency, when calculating the target guide vane angle corresponding to the current rotational speed, it is determined whether the change in guide vane angle is not less than a preset deviation. If the change in guide vane angle is not less than the preset deviation, it indicates that the guide vane angle is not within the allowable deviation range, and the guide vane angle is adjusted. If the change in guide vane angle is less than the preset deviation, it indicates that the guide vane angle is within the allowable deviation range, and no adjustment is made; the current guide vane angle is maintained. Specifically, the change in rotational speed can be calculated, and the change in guide vane angle can be determined based on the change in rotational speed using a difference method. This change in guide vane angle is the deviation between the target guide vane angle and the current guide vane angle. The specific preset deviation can be set as needed, such as 2°-5°, specifically 3°.

[0077] In some embodiments, the control method further includes:

[0078] Test the noise level of the fan at different speeds and at different angles when the guide vanes are locked at the preset swing stroke.

[0079] Establish and store the relationship between different guide vane angles corresponding to different fan speeds based on the guide vane angles corresponding to the lower noise values ​​at different fan speeds.

[0080] By pre-testing to establish and store the relationship between different guide vane angles corresponding to different speeds, the guide vane angle can be controlled during subsequent fan operation based on this pre-stored relationship. Furthermore, the relationship established by pre-testing is accurate and reliable. Specifically, the fan first runs at a first speed, and the guide vanes are locked at different angles within a preset swing stroke. The noise level at different guide vane angles is tested, and the guide vane angle corresponding to the lowest noise level is taken as the optimal guide vane angle for the first speed. The fan is then adjusted to a second speed, and the above operation is repeated to determine the optimal guide vane angle for the second speed. The fan speed is adjusted again, and the above operation is repeated to collect the optimal guide vane angles for each speed, thus establishing the relationship between different guide vane angles for different speeds.

[0081] The following description uses a specific embodiment as an example. In this embodiment, the head-mounted display device includes a main body and a fan disposed within the main body. The fan includes a housing 1 and multiple fan blades 2. The multiple fan blades 2 are disposed within the housing 1. The housing 1 has an air inlet and an air outlet 11. A vortex tongue 4 and a guide vane 3 are respectively disposed at the air outlet 11. The guide vane 3 is oscillatingly disposed within the housing 1 and can be locked at different angles within a preset oscillation stroke. When the guide vane 3 is locked, and the extension line of the guide vane 3 is aligned with the tip of one fan blade 2, the extension line of the vortex tongue 4 is aligned with the gap between the tips of two fan blades 2. Please refer to [link / reference]. Figure 7 The control method for the head-mounted display device includes the following steps:

[0082] S111: Receives the fan start command;

[0083] S112: Control the fan to run at the initial speed and control the guide vanes to lock at the initial angle corresponding to the initial speed;

[0084] S113: Receive speed change command;

[0085] S114: Determine whether the changed current speed corresponds to a speed value in the pre-stored relationship between different guide vane angles corresponding to different speeds. If yes, proceed to the next step; otherwise, proceed to step S117.

[0086] S115: Control the guide vane to swing to the guide vane angle corresponding to the rotation speed value and lock it;

[0087] S116: Determine whether the current rotational speed has changed. If yes, return to step S113; otherwise, proceed to step S121.

[0088] S117: Calculate the change in rotational speed;

[0089] S118: Based on the change in rotational speed and the relationship between different guide vane angles corresponding to different rotational speeds, calculate the change in guide vane angle and the target guide vane angle corresponding to the current rotational speed.

[0090] S119: Determine whether the change in guide vane angle is not less than the preset deviation. If yes, proceed to step S120; otherwise, proceed to step S121.

[0091] S120: Control the guide vane to swing to the target guide vane angle and lock it;

[0092] S121: Maintain the current guide vane angle.

[0093] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0094] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A head-mounted display device, characterized in that, The device includes a main body and a fan disposed on the main body. The fan includes a housing and multiple rotatable fan blades disposed within the housing. The housing has an air inlet and an air outlet. The housing has a vortex and a guide vane respectively located at the air outlet. The guide vane is oscillatingly disposed on the housing and can be locked at different angles of a preset oscillation stroke. When the guide vane is locked, the extension line of the guide vane is aligned with the blade tip of one of the fan blades, and the extension line of the vortex is aligned with the gap between the blade tips of the two fan blades.

2. The head-mounted display device according to claim 1, characterized in that, The guide vane includes a base and blades disposed on the base. The housing has a fan-shaped hole. The base is disposed outside the housing. The blades pass through the fan-shaped hole and can swing within the fan-shaped hole.

3. The head-mounted display device according to claim 2, characterized in that, The blade is flush with or extends beyond the corresponding edge of the fan blade along any one end edge of the fan blade along its axial direction.

4. The head-mounted display device according to claim 2, characterized in that, The blades are flat.

5. The head-mounted display device according to claim 1, characterized in that, The vortex tongue and the guide vane are respectively located in the low-speed air outlet area of ​​the air outlet.

6. The head-mounted display device according to claim 1, characterized in that, The preset swing stroke is within the range of 30°-120° relative to the end face of the air outlet.

7. The head-mounted display device according to any one of claims 1-6, characterized in that, It also includes a drive component, which is disposed in the housing and whose output end is connected to the guide vane to drive the guide vane to oscillate.

8. The head-mounted display device according to claim 7, characterized in that, The driving component includes a motor, and the drive shaft of the motor is connected to the guide vane; Alternatively, the driving component may include a telescopic cylinder or a linear motor, the output end of which is connected to a rack, and the guide vane is coaxially connected to a gear, with the rack meshing with the gear.

9. A control method for a head-mounted display device, characterized in that, The control method for a head-mounted display device as described in any one of claims 1-8 includes: Receive fan speed commands; The fan is controlled to run at the corresponding speed. Based on the pre-stored relationship between different guide vane angles corresponding to different speeds, the guide vane is controlled to swing to the angle corresponding to the current speed and then locked.

10. The control method for a head-mounted display device according to claim 9, characterized in that, Controlling the guide vane to swing to an angle corresponding to the current rotational speed and locking it specifically includes: Determine whether the current rotational speed corresponds to a pre-stored rotational speed value in the relationship between different guide vane angles corresponding to different rotational speeds; If so, control the guide vane to swing to the guide vane angle corresponding to the rotation speed value and lock it; Otherwise, based on the current rotational speed and the pre-stored relationship between different guide vane angles corresponding to different rotational speeds, the target guide vane angle corresponding to the current rotational speed is calculated, and the guide vane is controlled to swing to the target guide vane angle and locked.

11. The control method for a head-mounted display device according to claim 10, characterized in that, Calculate the target guide vane angle corresponding to the current rotational speed, control the guide vane to swing to the target guide vane angle and lock it, specifically including: Calculate the change in rotational speed; Based on the change in rotational speed and the relationship between different guide vane angles corresponding to different rotational speeds, the change in guide vane angle and the target guide vane angle corresponding to the current rotational speed are calculated. Determine whether the change in the guide vane angle is not less than a preset deviation; If so, control the guide vane to swing to the target guide vane angle and lock it; Otherwise, maintain the current guide vane angle.

12. The control method for a head-mounted display device according to any one of claims 9-11, characterized in that, Also includes: Test the noise level of the fan at different speeds and the guide vanes locked at different angles within a preset swing stroke. The relationship between different guide vane angles corresponding to different speeds is established and stored based on the guide vane angles corresponding to the lower noise values ​​of the fan at different speeds.

Images