Hot air device with adjustable airflow length

Abstract

To provide a hot air device with adjustable airflow path length. [Solution] The device includes a case, a heating device 2, a blower 3, and an extension case 4. An air passage 10 is provided inside the case, penetrating from front to back. The heating device is located inside the air passage and close to the outlet end of the air passage. The blower is located inside the case and close to the inlet end of the air passage. An extension air passage 41 is provided inside the extension case. The extension case is slidably mounted in the case. When the extension case is extended, the extension air passage communicates with the air passage. When the extension case is retracted into the case, the extension air passage is fitted to the outside of the air passage. The user can adjust the hot air intake path according to the thickness of the object to be heated, such as bedding or clothing, and the required airflow depth. This improves the heating coverage in the deep region and shortens the outer dimensions when not in use, making storage and carrying convenient.

Description

Technical Field

[0001] The present invention relates to a hot air device with an adjustable air path length.

Background Art

[0002] Hot air devices are widely applied to the heating and warming treatment of fabrics such as clothes, shoes, and futons. Here, futon warming usually continuously sends hot air into the futon to form a certain hot air circulation space inside the futon to achieve a good heating rate and heating uniformity. In the prior art, the hot air device used for futon warming usually includes a case, a blower device, and a heating device. During operation, outside air is sucked in by the blower device, heated by the heating device to form hot air, and then sent from the exhaust port into the futon to achieve the futon warming effect.

[0003] However, the conventional futon warming hot air device still has defects in terms of structure and use effect. First, since the length of the exhaust passage of many products is fixed, it is difficult to adjust the depth to which the hot air is sent into the futon, and the problem of insufficient hot air coverage in the deep layer area inside the futon is likely to occur, resulting in slow heating or uneven heating. Second, in order to ensure a certain blowing distance, the overall structure of some products is too long or the volume is too large, resulting in a large storage occupation space, inconvenient to carry, and unable to meet the requirements of small volume and easy storage in the home scene. Third, since the conventional products usually lack a structure for supporting the futon or fabric, the futon is likely to sink and stick together during use, making it difficult to form a stable hot air cavity and ventilation passage, and the hot air circulation effect is limited, affecting the futon warming efficiency and comfort.

Summary of the Invention

[0004] An object of the present invention is to provide a hot air device with an adjustable air path length in order to solve at least one of the above technical problems in the prior art.

[0005] The objective of this invention is achieved as follows.

[0006] A hot air device with adjustable airflow length, The device includes a case, a heating device, a blower, and an extension case, wherein an air passage is provided inside the case that penetrates from front to back, the heating device is provided inside the air passage and is close to the outlet end of the air passage, and the blower is provided inside the case and is close to the inlet end of the air passage. An extension air passage is provided inside the extension case, and the extension case is slidably mounted within the case. When the extension case extends, the extension air passage communicates with the air passage. When the extension case retracts into the case, the extension air passage is a hot air device fitted to the outside of the air passage, with an adjustable air passage length.

[0007] An air passage is provided inside the case, penetrating from front to back. An extendable case with an extendable air passage is slidably mounted inside the case. When the extendable case is extended, the extendable air passage and the existing air passage are connected, and when retracted, the extendable air passage is fitted to the outside of the existing air passage. This allows the effective length of the air passage to be changed as needed. The user can adjust the hot air intake path according to the thickness of the object to be heated, such as futons or clothing, and the required airflow depth, improving the heating coverage in the deeper areas. At the same time, the external dimensions are shortened when not in use, making storage and transport convenient. This solves the problems of conventional heaters where the length of the air passage is fixed, making it difficult to adjust the hot air intake depth and resulting in a large footprint.

[0008] The objective of this invention can also be solved using the following technical measures.

[0009] Furthermore, it further includes at least one support device comprising a front support arm and a rear support arm, wherein the rear end of the rear support arm is pivotably connected to the side wall of the extension case and is located near the front opening of the extension case, and the rear end of the front support arm is pivotally connected to the front end of the rear support arm. The side wall of the case is provided with a support device housing groove at a position corresponding to the support device, and the support device housing groove communicates with the inside of the case.

[0010] The stretching case is provided with at least one support device rotatably connected to its side wall, and the side wall of the case is provided with a support device housing groove that communicates with the interior of the case. This allows the support device to be inverted and unfolded to support blankets or clothing, forming a larger hot air cavity and ventilation passage, and to be folded and stored in the housing groove, reducing the exposed structure and facilitating storage. This improves the problem of impaired hot air circulation due to the indentation and bonding of fabrics during heating, which limits heating efficiency and uniformity.

[0011] Furthermore, the front case is provided with the air passage, and the front case has an extension case housing chamber formed on the outer circumference of the air passage, and the side wall of the front case is provided with the support device housing groove, and the support device housing groove is in communication with the extension case housing chamber.

[0012] The front case is provided with an air passage, and an extension case storage chamber is formed around the outer circumference of the air passage, allowing the extension case to be extended and retracted and stored within the storage chamber. Furthermore, a support device storage groove is provided on the side wall of the front case and communicates with the extension case storage chamber, enabling the support device to be neatly stored and reversed inside the case, ensuring the extension and retraction adjustment and support functions of the air passage, as well as making the overall structure of the machine more compact and reducing the storage volume, thus solving the problem of conventional heaters being difficult to compress in volume and occupying a large storage space.

[0013] Furthermore, a first stopper is provided on the outer circumference of the air passage near the outlet end, and a second stopper is provided on the inner wall of the extended air passage near its inlet end. The extension case is slidably provided within the extension case housing chamber, and when the extension case extends outward to a predetermined position, the second stopper contacts the first stopper to restrict the extension position of the extension case. In the state of the extension position restriction, the air passage is in communication with the extended air passage.

[0014] A first stopper is provided on the outer circumference of the air passage near the outlet end, and a second stopper is provided on the inner wall of the extension air passage near the inlet end. The extension case is slidably installed within the extension case housing chamber. When the extension case extends to the planned position, the second stopper contacts the first stopper to restrict the extension position, ensuring the reliability of the position and consistency of the extension length when the extension case is extended. This ensures stable communication between the air passage and the extension air passage when the extension position is restricted, avoiding excessive extension of the extension case or a decrease in the airflow effect due to unstable communication, thereby improving stability and reliability during use.

[0015] Furthermore, the system includes a circuit board and a control device, wherein the control device is provided in the case and is located near the inlet end of the air passage, the circuit board is provided inside the case, and the control device, heating device, and blower are each electrically connected to the circuit board. When the rear case rotates relative to the other, if the axis of the air passage and the axis of the blower are on the same straight line, the circuit board cuts off the power supply to the heating device and the blower. If the axis of the air passage is not in the same line as the axis of the blower, the magnet will be close to the Hall switch sensor, the circuit board will supply power to the heating device and the blower, and the control device will control the heating device and the blower to switch between different operating modes.

[0016] During the relative rotation of the rear case, if the axis of the air duct and the axis of the blower are in the same straight line, the circuit board shuts off the power supply to the heating device and blower. If the axes of the two are not in the same straight line, the circuit board supplies power to the heating device and blower under the trigger conditions of the magnet and Hall switch sensor engaging, thus avoiding erroneous operation in the event of unexpected posture or misoperation, and enhancing safety and reliability during use and storage. Furthermore, the control device can adjust the operating state of the heating device and blower under the conditions of the circuit board's power supply permission, enabling switching between different operating modes to suit different heating or heating targets and different usage needs, thereby increasing the adjustability and applicability of the function. In addition, by positioning the control device close to the inlet end of the air duct, electrical components such as the circuit board and control device are relatively far away from the high-temperature hot air area at the outlet end of the air duct, reducing direct blowing of hot air onto electrical components and thermal shock, thereby reducing the risk of performance degradation or reduced reliability due to excessive temperature rise of electrical components, and further improving the safety and stability of the overall operation of the machine.

[0017] The beneficial effects of this invention are as follows: In this invention, a sliding extension case and an extension air passage are provided. When the extension case is extended, it communicates with the air passage, and when it is retracted, it is fitted to the outside of the air passage, allowing the effective length of the air passage to be adjusted. Users can adjust the length according to the thickness of the object, such as bedding or clothing, and the required airflow depth, allowing the hot air to penetrate deeper into the target area. Furthermore, when not in use, the dimensions of the outer casing can be shortened for convenient storage and transport. In this invention, a support device is provided on the stretching case, and by fitting it into a support device housing groove on the side wall of the case, the support device can be deployed and stored folded. During heating, the futon or fabric can be supported to form a larger hot air cavity and ventilation passage, reducing blockage due to recessed bonding, improving hot air circulation conditions, improving heating efficiency and uniformity, and improving the efficiency of heating futons. [Brief explanation of the drawing]

[0018] [Figure 1]It is a schematic diagram of a hot air device (operating and energized state). [Figure 2] It is a cross-sectional view of FIG. 1 (schematic with axis). [Figure 3] It is a schematic diagram of a hot air device (operating and energized state, extended case extended, support device deployed state). [Figure 4] It is a cross-sectional view of FIG. 3 (schematic with axis). [Figure 5] It is a cross-sectional view of FIG. 3 from another angle. [Figure 6] It is a schematic diagram of a hot air device (extended case extended, power-off state). [Figure 7] It is a cross-sectional view of FIG. 6 (schematic with axis). [Figure 8] It is a schematic diagram of a hot air device (stored and power-off state). [Figure 9] It is an assembly drawing of the front case, rear case, and connection ring.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, the present invention will be further described with reference to the drawings and Example 1.

[0020] Example 1 is a hot air device including a case 1, a heating device 2, a blower device 3, an extended case 4, a circuit board, a hall switch sensor 5, a magnet 51, a control device 6, and a power line 61, as shown in FIGS. 1 to 9.

[0021] The case 1 includes a front case 11, a connection ring 13, and a rear case 12. The connection ring 13 is connected to the front case 11 at the front end and rotatably connected to the rear case 12 at the rear end, making the front case 11 and the rear case 12 relatively rotatable. In Example 1, the front case 11, the extended case 4, and the rear case 12 are all linear cylindrical structures, and their axes are straight lines.

[0022] A passage 10 is formed inside the front case 11, extending longitudinally from front to back. The heating device 2 is located inside the passage 10 and is close to the outlet end of the passage 10. The rear case 12 has a hollow structure, and multiple through holes 121 are provided at intervals in its case wall. A power line 61 is connected to the rear end of the rear case 12, and the power line 61 is electrically connected to a circuit board. The blower 3 is located inside the rear case 12 and is close to the inlet end of the passage 10; the blower 3 is a fan.

[0023] An extension air passage 41 is provided inside the extension case 4, and an extension case housing chamber 111 is formed on the outer circumference of the air passage 10 in the front case 11. The extension case 4 is slidably installed inside the extension case housing chamber 111 and is able to extend and retract relative to the front case 11. When the extension case 4 extends, the extension air passage 41 communicates with the air passage 10, and when the extension case 4 retracts into the case 1, the extension air passage 41 is fitted and housed on the outside of the air passage 10.

[0024] To control the extension position of the extension case 4, a first stopper 112 is provided on the outer circumference of the air passage 10 near its outlet end, and a second stopper 113 is provided on the inner wall of the extension air passage 41 near its inlet end. When the extension case 4 extends outward to the position control point, the second stopper 113 comes into contact with the first stopper 112, restricting the extension position of the extension case 4. At this position control point, the air passage 10 is in communication with the extension air passage 41.

[0025] 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 pivotally connected to the side wall of the extension case 4 and is located near the front opening of the extension case 4. The rear end of the front support arm 71 is pivotally connected to the front end of the rear support arm 72. The side wall of the front case 11 is provided with a support device housing groove 114 at a position corresponding to the support device 7, the support device housing groove 114 communicates with the inside of the front case 11, and the support device 7 can be housed in the support device housing groove 114 and can be inverted to form a support structure.

[0026] The circuit board is housed inside the case 1 and is electrically connected to the Hall switch sensor 5, the blower 3, and the heating device 2. The Hall switch sensor 5 is located on the connecting ring 13, and the magnet 51 is located on the rear case 12. When the rear case 12 rotates relative to the other device, if the axis of the air passage 10 and the axis of the blower 3 are aligned, the magnet 51 moves away from the Hall switch sensor 5, and the circuit board cuts off the power supply to the heating device 2 and the blower 3, putting the heating device 2 and the blower 3 into an unpowered state. If the axis of the air passage 10 and the axis of the blower 3 are not aligned, the magnet 51 moves closer to the Hall switch sensor 5, and the circuit board supplies power to the heating device 2 and the blower 3, putting the heating device 2 and the blower 3 into an energized operating state. This enables switching between an operating state and an unpowered state due to relative rotation, thereby enhancing safety during use.

[0027] The control device 6 is located in the front case 11 and is close to the inlet end of the air passage 10. The control device 6 is electrically connected to the circuit board to control the switching between different operating modes of the heating device 2 and the blower device 3.

[0028] Instructions for use and operating principle When in use, the user rotates the rear case 12 to position the axis of the air passage 10 and the axis of the fan so that they are not in the same straight line. The circuit board then supplies power to the fan and the heating device 2, and the hot air device enters operation. If it is necessary to extend the exhaust passage, the user pulls the extension case 4 outward to the position where the second stopper 113 abuts against the first stopper 112, completing the extension position restriction and connecting the air passage 10 to the extension air passage 41. When not in use, the extension case 4 is pushed back into the extension case housing chamber 111, and the extension air passage 41 is fitted and housed outside the air passage 10. If support positioning is required, the user can deploy the front support arm 71 and the rear support arm 72.

[0029] During operation, outside air enters the rear case 12 through the through-hole 121 in the case wall of the rear case 12, is drawn in by the blower 3 (fan), and sent out along the air passage 10, forming a stable airflow. After entering the air passage 10, the airflow flows through the heating device 2 installed inside the air passage 10, where the heating device 2 heats the air to form hot air, which is then discharged from the outlet end of the air passage 10. When the extension case 4 is extended and in communication with the air passage 10, the hot air is sent to an even more distant location via the extension air passage 41, achieving the purpose of heating and drying by supplying hot air to bedding, clothing, etc., and facilitating heat exchange.

[0030] Deployment and storage operations and volume reduction principle In this invention, the extension case 4 is slidably provided in the extension case housing chamber 111 formed in the front case 11, the support device 7 is provided in the support device housing groove 114 of the side wall of the case 1 and is foldable for storage, and the rear case 12 is rotatably connected to the front case 11 via a connecting ring 13.

[0031] When the user stores the unit, 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 case 4 back into the storage chamber axially to fit the extension air passage 41 to the outside of the air passage 10. At this time, the support device 7 is synchronously recovered into the support device storage groove 114. After that, the rear case 12 is rotated relative to the front case 11 until the axis of the air passage 10 and the axis of the blower 3 are in the same straight line, the heating device 2 and the blower 3 are powered off, and the unit is folded and stored, thereby shortening the overall outer length of the machine, reducing the number of exposed members, and decreasing the storage volume.

[0032] When the user deploys and uses the system, the rear case 12 is rotated relative to the front case 11 until the axis of the air passage 10 and the axis of the blower 3 are not in the same straight line, thereby enabling power to be supplied. Then, if necessary, the extension case 4 is pulled out to a position where the second stopper 113 contacts the first stopper 112, connecting the air passage 10 and the extension air passage 41 to extend the exhaust passage. After that, the front support arm 71 and the rear support arm 72 are deployed to support blankets and clothing, forming a larger hot air cavity. Once deployment is complete, the control device 6 can be used to select an operating mode for heating.

[0033] The futon is heated 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 case 11 into the futon through this opening. The front case 11 has a linear cylindrical structure, and because its outer shape is elongated and its axis is straight, it can be inserted along the direction of the futon's internal space to facilitate positioning, reduce insertion resistance, and increase the depth to which hot air can be delivered.

[0034] If it is necessary to further increase the depth to which the hot air is sent inside the futon, the user can extend the exhaust passage by pulling the extension case 4 outwards along the outer circumference of the front case 11 and connecting the extension air passage 41 with the air passage 10, thereby extending the hot air outlet position further inside the futon. This is advantageous for the hot air to cover a deeper area and enhance the heating effect in the deeper regions.

[0035] To improve the hot air circulation conditions inside the futon, the user can invert and unfold the support device 7, and by supporting a localized area of ​​the futon with the support device 7, a larger hot air cavity and circulation space can be formed inside the futon. Supporting the futon with the support device 7 prevents blockage near the exhaust port due to the futon's collapsed edges, while increasing the ventilation cross-section and convective heat exchange area inside the futon, thereby improving hot air diffusion efficiency and heating efficiency.

[0036] During the heating process described above, if the user rotates the front case 11 and the rear case 12 relative to each other to a position where the axis of the airflow path 10 and the axis of the fan are not aligned, the circuit board supplies power to the fan and the heating device 2, and the hot air device enters operation mode. When the two axes are aligned, the circuit board cuts off the power supply to the fan and the heating device 2, automatically shutting off the hot air device and reducing the safety risk of accidental activation due to misoperation. The user can also select different operating modes using the control device 6 to adapt to futons of different thicknesses or different usage needs, achieving more flexible heating control.

[0037] As described above, the front case 11 facilitates entry into the futon, the extension case 4 extends the air passage 10 to increase the hot air delivery depth, and the support device 7 supports the futon to form a larger hot air cavity. The above-described structural synergy improves the coverage area and convection efficiency of the hot air inside the futon, increases heating efficiency, improves heating uniformity, and achieves a good futon heating effect.

[0038] Differences between Example 2 and Example 1 In Example 2, a microswitch is used instead of the Hall switch sensor 5 and magnet 51 of Example 1, 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 case 12 is provided with a pressing projection. When the rear case 12 rotates, if the axis of the air passage 10 and the axis of the blower 3 are on the same line, the pressing projection moves away from the microswitch, and the circuit board cuts off the power supply to the heating device 2 and the blower 3. If the axis of the air passage 10 and the axis of the blower 3 are not on the same 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 with an adjustable airflow path length, comprising a case, a heating device, a blower, an extension case, and at least one support device, An air passage is provided inside the case, penetrating from front to back, the heating device is provided inside the air passage and close to the outlet end of the air passage, and the blower is provided inside the case and close to the inlet end of the air passage. An extension air passage is provided inside the extension case, and the extension case is slidably mounted within the case. When the extension case extends, the extension air passage communicates with the air passage. When the extension case retracts into the case, the extension air passage is fitted to the outside of the air passage. The support device is provided on the side wall of the extension case and is located near the front end opening of the extension case, characterized in that the hot air device has an adjustable airflow path length.

2. The support device includes a front support arm and a rear support arm, the rear end of the rear support arm being pivotably connected to the side wall of the extension case and located near the front opening of the extension case, and the rear end of the front support arm being pivotably connected to the front end of the rear support arm. The hot air device with adjustable airflow length according to claim 1, characterized in that the side wall of the case is provided with a support device housing groove at a position corresponding to the support device, and the support device housing groove communicates with the inside of the case.

3. The hot air device with adjustable airflow length according to claim 2, wherein the case includes a front case, a rear case, and a connecting ring, the front end of the connecting ring is fixedly or rotatably connected to the front case, and the rear end is fixedly or rotatably connected to the rear case.

4. The hot air device with adjustable air passage length according to claim 3, characterized in that the front case is provided with the air passage, the front case has an extension case housing chamber formed on the outer circumference of the air passage, the side wall of the front case is provided with a support device housing groove, and the support device housing groove is in communication with the extension case housing chamber.

5. A first stopper is provided on the outer circumference of the air passage near the outlet end, and a second stopper is provided on the inner wall of the extended air passage near its inlet end. The extension case is slidably provided within the extension case housing chamber, and when the extension case extends outward to a predetermined position, the second stopper contacts the first stopper to restrict the extension position of the extension case. The hot air device with adjustable airflow length according to claim 4, characterized in that, in the state of the extension position restriction, the airflow is in communication with the extension airflow.

6. The system further includes a circuit board and a control device, wherein the control device is provided in the case and is located near the inlet end of the air passage, the circuit board is provided inside the case, and the control device, heating device, and blower are each electrically connected to the circuit board. When the rear case rotates relative to the other, if the axis of the air passage and the axis of the blower are on the same straight line, the circuit board cuts off the power supply to the heating device and the blower. A hot air device with an adjustable airflow path length according to any one of claims 1 to 5, characterized in that, if the axis of the airflow path is not in the same line as the axis of the blower, the magnet is positioned close to the Hall switch sensor, the circuit board supplies power to the heating device and the blower, and the control device controls the heating device and the blower to switch between different operating modes.

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