hot air device

Abstract

The present invention provides a hot air device that can be stored more compactly and, at the same time, maintains power cutoff while stored, thereby improving safety during storage. [Solution] A hot air device comprising a front housing 11, a rear housing 12, a blower 3, and a heating device 2, wherein an air duct 10 is formed in the front housing that penetrates from front to back along its length, the heating device is provided inside the air duct, the rear housing has a hollow structure and multiple through holes 121 are provided at intervals in its housing wall, the blower is provided inside the rear housing, the front housing and the rear housing are rotatably connected, thereby allowing the front housing and / or the rear housing to rotate relative to each other, when the axis of the air duct and the axis of the blower are aligned, the heating device and blower are powered off, when the axis of the air duct and the axis of the blower are not aligned, the heating device and blower are powered on. The rear housing reduces the volume of the hot air device by rotating to the alignment position when stored.

Description

Technical Field

[0001] This invention relates to a hot air device.

Background Art

[0002] Conventional hot air devices for futons generally consist of a housing, a blowing member, and a heating member. During operation, air is introduced by the blowing member, heated by the heating member to form hot air, and the hot air is supplied to the inside or the surface of the futon, thereby achieving the effect of heating the futon to make it warm. However, the following problems remain in the conventional technical solutions. (1) Many products have a fixed overall structural dimension and cannot adjust the length / volume of the main body, so storage and carrying are inconvenient, and the occupied space is also large. (2) It is generally impossible to extend the blowing path, making it difficult to introduce hot air deep into the futon. The temperature rise in the deep region inside the futon is slow or the heating is insufficient, and the applicability is monotonous.

Summary of the Invention

[0003] In order to solve at least the above at least one technical problem in the prior art, the object of the present invention is to provide a hot air device.

[0004] The object of the present invention is realized as follows.

[0005] A hot air device comprising a front housing, a rear housing, a blowing device, and a heating device. An air duct that penetrates front and rear along the length direction is formed in the front housing, and the heating device is provided in the air duct. The rear housing has a hollow structure, and a plurality of through holes are provided at intervals in its housing wall. The blowing device is provided inside the rear housing. The front housing and the rear housing are rotatably connected, whereby the front housing and / or the rear housing can rotate relatively. <When the axis of the air duct and the axis of the blower are aligned in a straight line, the heating device and the blower will be in a power-off state. If the axis of the air duct and the axis of the blower are not aligned in a straight line, the heating device and the blower will be energized and in operation.

[0006] The front housing has an air duct that penetrates from front to back, and a blower is installed inside the rear housing. By rotatably connecting the front and rear housings, when the rear housing rotates, alignment and misalignment can be achieved between the axis of the air duct and the axis of the blower. When the two axes are aligned, the heating device and blower are powered off, and when the two axes are misaligned, the heating device and blower are powered on. When the rear housing rotates to the alignment position during storage, the volume of the heating device is reduced, allowing for compact storage. At the same time, power is maintained during storage, improving storage safety.

[0007] The objective of this invention can also be achieved by the following technical means.

[0008] Furthermore, it further includes a connecting ring whose front end is fixedly or rotatably connected to the front housing, and whose rear end is fixedly or rotatably connected to the rear housing.

[0009] The connecting ring provides a stable and reliable connection and positioning base against the relative rotation of the front and rear housings. This allows for smoother switching between aligned and misaligned states, resulting in more stable fitting of the structures. Consequently, it is advantageous for achieving normal airflow and heating in the non-aligned state, and reliable power cutoff in the aligned state.

[0010] Furthermore, the device further comprises a circuit board, a Hall switch sensor, and a magnet, and the Hall switch sensor, blower, and heating device are each electrically connected to the circuit board. The Hall switch sensor is provided on the connecting ring or the rear housing, and the magnet is provided on the rear housing or the connecting ring. When the rear housing rotates, if the axis of the air duct and the axis of the blower are aligned in a straight line, the magnet moves away from the Hall switch sensor, and the circuit board shuts off the power supply to the heating device and the blower. If the axis of the air duct and the axis of the blower are not aligned in a straight line, the magnet approaches the Hall switch sensor, and the circuit board supplies power to the heating device and the blower.

[0011] By introducing a combination of a Hall switch sensor and a magnet into the circuit, and by using a circuit board to supply power to the heating device and blower only when both meet the trigger conditions, and cutting off the power supply when not triggered, it is possible to detect the alignment state and control the power supply in a non-contact manner, thereby improving the sensitivity and reliability of power supply on / off and reducing wear and tear.

[0012] Furthermore, the device further comprises a circuit board and a microswitch, the microswitch, the blower, and the heating device are each electrically connected to the circuit board. The microswitch is provided on the connecting ring or the rear housing, and the rear housing or the connecting ring is provided with a pressing projection. When the rear housing rotates, if the axis of the air duct and the axis of the blower are aligned in a straight line, the pressing projection moves away from the microswitch, and the circuit board shuts off the power supply to the heating device and the blower. If the axis of the air duct and the axis of the blower are not aligned in a straight line, the pressing projection presses the microswitch, and the circuit board supplies power to the heating device and the blower.

[0013] During the rotation of the rear housing, the microswitch is pressed or released by the pressing projection. As a result, when the axis of the air duct and the axis of the blower are aligned, the pressing projection moves away from the microswitch, and the circuit board shuts off the power supply to the heating device and blower. On the other hand, when the axes of the two are not aligned, the pressing projection presses the microswitch, and the circuit board supplies power to the heating device and blower. This allows the hot air device to automatically shut off power in a specific position and automatically power on in an operating position, improving safety and reliability during use. At the same time, the power supply control is achieved by adopting a mating structure between the microswitch and the pressing projection, resulting in a simple structure, low cost, clear trigger, easy assembly and maintenance, and advantages in improving product consistency and reducing the risk of failure.

[0014] Furthermore, the system further includes a controller, wherein the heating device is provided inside the air duct and near the outlet end of the air duct, and the controller is provided on the front housing and near the inlet end of the air duct, is electrically connected to the circuit board, and is used to control the heating device and the blower to switch between different operating modes.

[0015] By installing the heating device inside the air duct and near the outlet end of the air duct, and the controller on the front housing and near the inlet end of the air duct, and by electrically connecting the controller to the circuit board, on the one hand, the circuit board and other electrical components such as the controller are separated from the high-temperature hot air region at the outlet end of the air duct, reducing direct blowing of hot air onto the electrical components and thermal shock, thereby reducing the risk of performance degradation and reliability degradation caused by excessive temperature rise of the electrical components, and improving the safety and stability of the entire device during use. On the other hand, the controller can adjust the operating state of the heating device and the blower, and it is possible to switch between different operating modes to suit different heating targets and different heating needs, thereby improving the problems of the singularity of operating modes and the inconvenience of functional adjustment in conventional technology.

[0016] Furthermore, power lines that are electrically connected to the circuit board are connected to the rear end of the rear housing.

[0017] By placing the power lines at the rear end of the rear housing and electrically connecting them to the circuit board, the power supply interface can be concentrated at the rear of the entire device. This avoids interference with usage operations such as the air outlet, extension and retraction of the extendable housing, and insertion into the futon, as power lines may be routed from the side or front, improving ease of use and smooth operation. At the same time, locating the power lines at the rear makes the wiring of the entire device neater and allows for easier control of the heat receiving area. This reduces the risk of thermal aging caused by the power lines being close to the hot air outlet and improves the reliability and safety of the power supply connection of the entire device.

[0018] Furthermore, it further comprises an extension housing that is slidably mounted on the front housing and has an extension air duct inside, When the extension housing extends, the extension air duct communicates with the air duct. When the extension housing is housed within the front housing, the extension air duct is fitted onto the outside of the air duct.

[0019] By providing a slidable extendable housing and forming an extendable air duct within the extendable housing, the extendable air duct communicates with the air duct when the extendable housing is extended, and when it is retracted, the extendable air duct is fitted to the outside of the air duct. This allows the user to adjust the extension length of the extendable housing according to the thickness of the futon, the heating position, and the depth to be heated, thereby controlling and adjusting the depth of hot air delivery. When in use, the exhaust passage can be extended to deliver hot air to deeper parts of the futon, and when not in use, the external size can be reduced by retracting the extendable housing, making it easy to store and carry. This improves upon the problem in conventional products where the exhaust passage cannot be extended, making it difficult to sufficiently heat the deep areas inside the futon, and also improves upon the problem of conventional products having a fixed volume and occupying a large space.

[0020] The beneficial effects of this invention are as follows.

[0021] In this invention, by providing a slidable extension housing and an extension air duct, when the extension housing extends, it can communicate with the air duct, and when it is stored, it can be externally fitted outside the air duct, thereby enabling adjustment of the air duct length of the hot air device and change of the overall volume of the device. When not in use or during storage, the extension housing can be retracted, shortening the overall outer length of the device and reducing the exposed members, thus making the storage volume smaller and facilitating carrying and storage.

[0022] In this invention, the front housing and the rear housing are rotatably connected. When the axis of the air duct and the axis of the blower device are not in a straight line, the air flow path is in an operating conduction state. In combination with the circuit board supplying power to the blower device and the heating device, the hot air device is in an energized operating state, realizing stable air blowing and heating output, thereby meeting the normal hot air supply needs during the heating process.

[0023] In this invention, when the axis of the air duct and the axis of the blower device are in a straight line, the heating device and the blower device automatically cut off the power supply. By rotating the rear housing to the coaxial position, a more compact storage posture is formed. In combination with the retraction of the extension housing, the occupied space is further reduced, realizing more convenient storage and preservation.

[0024] In this invention, when heating thick fabric products such as futons, the user can adjust the extension length of the extension housing according to the thickness of the futon and the desired heating position, thereby changing the effective length of the air duct, realizing control and adjustment of the hot air feeding depth, allowing the hot air to reach different depth regions inside the futon, reducing the problem that the deep region is difficult to be heated, improving the heating uniformity, and improving the efficiency of warming the futon.

Brief Description of the Drawings

[0025] [Figure 1] Figure 1 is a schematic diagram of the hot air device (operating and powered-on state). [Figure 2] Figure 2 is a cross-sectional view of Figure 1 (showing the axis). [Figure 3] Figure 3 is a schematic diagram of the hot air device (operating and powered-on state, with the extension housing extended and the support device deployed). [Figure 4] Figure 4 is a cross-sectional view of Figure 3 (showing the axis). [Figure 5] Figure 5 is a cross-sectional view of Figure 3 from another angle. [Figure 6] Figure 6 is a schematic diagram of the hot air device (extension housing extended, power-off state). [Figure 7] Figure 7 is a cross-sectional view of Figure 6 (showing the axis). [Figure 8] Figure 8 is a schematic diagram of the hot air device (stored, power-off state). ​​​​​​​​​​​​​​​​​​​​​An air duct 10 is formed inside the front housing 11, extending from front to back along its length. The heating device 2 is located inside the air duct 10 and near the outlet end of the air duct 10. The rear housing 12 has a hollow structure, and multiple through holes 121 are provided at intervals in its housing wall. Power lines 61, which are electrically connected to the circuit board, are connected to the rear end of the rear housing 12. The blower 3 is located inside the rear housing 12 and near the inlet end of the air duct 10, and the blower 3 is a fan.

[0030] An extendable air duct 41 is provided inside the extendable housing 4, and an extendable housing dwelling cavity 111 is formed on the outer circumference of the air duct 10 in the front housing 11. The extendable housing 4 is slidably provided inside the extendable housing dwelling cavity 111, thereby allowing it to extend and retract relative to the front housing 11. When the extendable housing 4 is extended, the extendable air duct 41 communicates with the air duct 10, and when the extendable housing 4 is housed inside the housing 1, the extendable air duct 41 is fitted onto the outside of the air duct 10 for storage.

[0031] To restrict the extension position of the extendable housing 4, a first restricting sheet 112 is provided on the outer circumference of the air duct 10 near its outlet end, and a second restricting sheet 113 is provided on the inner wall of the extendable air duct 41 near its inlet end. When the extendable housing 4 extends outward and reaches the restricted position, the second restricting sheet 113 comes into contact with the first restricting sheet 112, thereby restricting the extension of the extendable housing 4, and at this restricted position, the air duct 10 and the extendable air duct 41 communicate with each other.

[0032] This embodiment 1 further includes at least one support device 7, which includes a front support arm 71 and a rear support arm 72. The rear end of the rear support arm 72 is rotatably connected to the side wall of the extension housing 4 and is located near the front opening of the extension housing 4, and the rear end of the front support arm 71 is rotatably connected to the front end of the rear support arm 72. A support device housing groove 114 is provided on the side wall of the front housing 11 at a position corresponding to the support device 7, and the support device housing groove 114 communicates with the inside of the front housing 11, and the support device 7 can be housed in the support device housing groove 114 and can rotate outward to form a support structure.

[0033] The circuit board is housed inside the housing 1 and is electrically connected to the Hall switch sensor 5, the blower 3, and the heating device 2, respectively. The Hall switch sensor 5 is located on the connecting ring 13, and the magnet 51 is located on the rear housing 12. When the rear housing 12 rotates relative to the heating device, if the axis of the air duct 10 and the axis of the blower 3 are aligned, the magnet 51 moves away from the Hall switch sensor 5, the circuit board cuts off the power supply to the heating device 2 and the blower 3, and the heating device 2 and the blower 3 enter a power-off state. If the axis of the air duct 10 and the axis of the blower 3 are not aligned, the magnet 51 moves closer to the Hall switch sensor 5, the circuit board supplies power to the heating device 2 and the blower 3, and the heating device 2 and the blower 3 enter an energized operating state. This enables switching between operating and power-off states through relative rotation, improving safety during use.

[0034] The controller 6 is located in the front housing 11 and near the inlet end of the air duct 10, is electrically connected to the circuit board, and is used to control the heating device 2 and the blower 3 to switch between different operating modes.

[0035] Instructions for use and operating principle

[0036] When in use, the user rotates the rear housing 12 so that the axis of the air duct 10 and the axis of the fan are not aligned in a straight line, the circuit board supplies power to the fan and the heating device 2, the hot air device is in operation, and if it is necessary to extend the exhaust passage, the user pulls out the extension housing 4 to the outside and moves it to the restricted position where the second restricting sheet 113 abuts against the first restricting sheet 112, thereby completing the extension restriction and connecting the air duct 10 and the extension air duct 41. When not in use, the extension housing 4 is pushed back into the extension housing cavity 111 and the extension air duct 41 is fitted onto the outside of the air duct 10 to store it, and if support positioning is required, the user can deploy the front support arm 71 and the rear support arm 72.

[0037] During operation, outside air enters the rear housing 12 through the through-hole 121 on the housing wall of the rear housing 12, is drawn in by the action of the blower 3 (fan), and is sent out along the direction of the air duct 10, forming a stable airflow. After entering the air duct 10, the airflow passes through the heating device 2 installed inside the air duct 10, where the heating device 2 heats the air to form hot air, which is then discharged from the outlet end of the air duct 10. When the extendable housing 4 is extended and in communication with the air duct 10, the hot air is further transported to a more distant location via the extendable air duct 41, thereby delivering hot air and performing convective heat exchange with bedding, clothing, etc., thereby achieving the purpose of heating and drying.

[0038] Deployment and storage operation and volume reduction principle

[0039] In this invention, the extendable housing 4 is slidably provided within an extendable housing housing cavity 111 formed in the front housing 11, the support device 7 is provided within a support device housing groove 114 in the side wall of the housing 1 and is foldable for storage, and at the same time, the rear housing 12 is rotatably connected to the front housing 11 via a connecting ring 13.

[0040] When the user stores the device, they first fold the front support arm 71 and rear support arm 72 of the support device 7 inward in sequence, and then push the extension housing 4 back into the housing cavity along the axial direction to fit the extension air duct 41 onto the outside of the air duct 10. At this time, the support device 7 is synchronously stored in the support device housing groove 114. Subsequently, the rear housing 12 is rotated relative to the front housing 11 until the axis of the air duct 10 and the axis of the blower 3 are aligned in a straight line, thereby shutting off the power to the heating device 2 and the blower 3, and putting the device into a folded storage state. This shortens the overall external length of the device, reduces exposed components, and decreases the storage volume.

[0041] When a user deploys and uses the device, they first rotate the rear housing 12 relative to the front housing 11 until the axis of the air duct 10 and the axis of the blower 3 are not in a straight line, thereby enabling power to be supplied. Then, if necessary, they pull out the extension housing 4 outwards and move it to a regulated position where the second restricting sheet 113 contacts the first restricting sheet 112, thereby connecting the air duct 10 and the extension air duct 41 and extending the exhaust passage. After that, they deploy the front support arm 71 and the rear support arm 72 to tuck the futon or clothing, forming a larger hot air cavity. Once deployment is complete, they can select an operating mode via the controller 6 and begin heating.

[0042] Regarding warming a futon using the hot air device of Example 1, When heating the futon, the user opens one end of the futon to form an opening and inserts the front end of the front housing 11 into the futon through the opening. The front housing 11 has a straight cylindrical structure, and because its outer shape is long and slender and its axis is straight, it is easy to insert along the spatial direction inside the futon and easy to position, thereby reducing insertion resistance and increasing the depth to which the hot air can reach.

[0043] If the user wishes to further increase the depth to which hot air is delivered into the bedding, they can extend the exhaust passage by pulling the extension housing 4 outward along the outer circumference of the front housing 11 and connecting the extension air duct 41 and the air duct 10. This moves the position of the hot air outlet to a deeper part of the bedding, allowing the hot air to reach deeper areas and enhancing the heating effect in those deeper areas.

[0044] To improve the hot air circulation conditions inside the futon, the user pulls out and unfolds the support device 7, which then braces a portion of the futon, creating a larger hot air cavity and circulation space inside the futon. By supporting the futon with the support device 7, blockage near the air outlet due to the futon collapsing can be avoided, and the ventilation cross-sectional area and convective heat exchange area inside the futon can be increased, thereby improving the hot air diffusion efficiency and heating efficiency.

[0045] During the heating process described above, the user rotates the front housing 11 and the rear housing 12 relative to each other until the axis of the air duct 10 and the axis of the fan are no longer aligned. At this point, the circuit board supplies power to the fan and the heating device 2, and the hot air device becomes operational. When the two are rotated until their axes are aligned, the circuit board cuts off the power supply to the fan and the heating device 2, and the hot air device automatically shuts off its power, thereby reducing the safety risk of accidental activation due to misoperation. The user can further select different operating modes via the controller 6 to accommodate futons of different thicknesses or different usage needs, achieving more flexible heating control.

[0046] As described above, the front housing 11 can be easily inserted deeply into the inside of the futon, the extendable housing 4 can extend the air duct 10 to increase the depth of hot air delivery, and the support device 7 can brace the futon to form a larger hot air cavity. The above structures work synergistically to improve the reach of hot air and convection efficiency inside the futon, thereby improving heating efficiency, heating uniformity, and achieving a good futon heating effect.

[0047] The differences between Example 2 and Example 1 are as follows. In Example 2, the Hall switch sensor 5 and magnet 51 of Example 1 are removed and replaced with a microswitch, and the microswitch, blower 3, and heating device 2 are each electrically connected to the circuit board. The microswitch is provided on the connecting ring 13, and the rear housing 12 is provided with a pressing projection. When the rear housing 12 rotates, if the axis of the air duct 10 and the axis of the blower 3 are aligned in a straight line, the pressing projection moves away from the microswitch, and the circuit board shuts off the power supply to the heating device 2 and the blower 3. If the axis of the air duct 10 and the axis of the blower 3 are not aligned in a straight line, the pressing projection presses the microswitch, and the circuit board supplies power to the heating device 2 and the blower 3.

Claims

1. A hot air device comprising a front housing, a rear housing, a blower, and a heating device, The front housing has an air duct that penetrates it from front to back along its length, and the heating device is provided inside the air duct. The rear housing has a hollow structure, and multiple through holes are provided at intervals in its housing wall, and the blower is provided inside the rear housing. The front housing and the rear housing are rotatably connected, thereby allowing the front housing and / or the rear housing to rotate relative to each other. When the axis of the air duct and the axis of the blower are aligned in a straight line, the heating device and the blower will be in a power-off state. A hot air device characterized in that, if the axis of the air duct and the axis of the blower are not aligned in a straight line, the heating device and the blower enter an energized operating state.

2. The hot air device according to claim 1, further comprising a connecting ring whose front end is fixedly or rotatably connected to the front housing and whose rear end is fixedly or rotatably connected to the rear housing.

3. The device further comprises a circuit board, a Hall switch sensor, and a magnet, wherein the Hall switch sensor, a blower, and a heating device are each electrically connected to the circuit board. The Hall switch sensor is provided on the connecting ring or the rear housing, and the magnet is provided on the rear housing or the connecting ring. When the rear housing rotates, if the axis of the air duct and the axis of the blower are aligned in a straight line, the magnet moves away from the Hall switch sensor, and the circuit board shuts off the power supply to the heating device and the blower. The hot air device according to claim 1, wherein if the axis of the air duct and the axis of the blower are not located in a straight line, the magnet approaches the Hall switch sensor, and the circuit board supplies power to the heating device and the blower.

4. The device further comprises a circuit board and a microswitch, wherein the microswitch, the blower, and the heating device are each electrically connected to the circuit board. The microswitch is provided on the connecting ring or the rear housing, and the rear housing or the connecting ring is provided with a pressing projection. When the rear housing rotates, if the axis of the air duct and the axis of the blower are aligned in a straight line, the pressing projection moves away from the microswitch, and the circuit board shuts off the power supply to the heating device and the blower. The hot air device according to claim 1, wherein if the axis of the air duct and the axis of the blower are not aligned in a straight line, the pressing projection presses the microswitch, and the circuit board supplies power to the heating device and the blower.

5. The hot air device according to claim 3 or 4, further comprising a controller, wherein the heating device is provided inside the air duct and near the outlet end of the air duct, and the controller is provided on the front housing and near the inlet end of the air duct, electrically connected to the circuit board, and used to control the heating device and the blower to switch between different operating modes.

6. The hot air device according to claim 3 or 4, characterized in that a power line electrically connected to the circuit board is connected to the rear end of the rear housing.

7. An extendable air duct is provided inside, and the system further comprises an extendable housing that is slidably mounted on the front housing, When the extension housing extends, the extension air duct communicates with the air duct. The hot air device according to claim 1, characterized in that when the extendable housing is housed in the front housing, the extendable air duct is fitted to the outside of the air duct.

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