Limited space integrated intelligent device

Abstract

This invention discloses an integrated intelligent device for confined spaces, belonging to the field of power operations. It solves the problem of ineffective management of folding ducts. The technical solution is as follows: the folding duct can switch between a retracted state (where adjacent rigid frames are close together) and an extended state (where adjacent rigid frames are far apart). In the retracted state, the folding duct is housed within a casing. The casing contains a first stop, a detector, a guide rail, and a controller located on the side of the folding duct. The guide rail extends along the axis of the folding duct. The first stop is slidably mounted on the guide rail. The controller receives the target extension length of the folding duct input by the user. The detector detects the position of each rigid frame. The controller determines the corresponding target rigid frame based on the target extension length and controls the first stop to slide to the target rigid frame to fix the remaining retracted folding duct. This invention provides intelligent control and limiting of the extension length of the folding duct.

Description

Technical Field

[0001] This invention relates to the field of ventilation in enclosed spaces, and in particular to an integrated intelligent device for confined spaces. Background Technology

[0002] With the increasing number of underground facilities such as cables and waterways, operations in confined underground spaces are becoming more frequent. Because these spaces lack air circulation for extended periods, they inevitably accumulate harmful gases, posing a significant danger to workers. To address this, existing technologies, such as the utility model patent CN222746260U, disclose a portable rapid detection ventilation device. The device includes a detection box with a gas guiding structure inside. This structure is a folded duct that can be stored within the detection box. One end of the folded duct is connected to a fan, and the other end extends into a confined space. The fan draws gas from the gas guiding structure into the detection box, accelerating the exhaust of air from the confined space. While the depth of the well or the length of the pipe varies depending on the application scenario, the folded duct in the aforementioned device must be fully extended during use, making it impossible to flexibly adjust the extension length according to the specific application requirements. When the folded duct is fully extended, the distance between the fan and the target area is too great, resulting in an unsatisfactory suction effect and affecting overall ventilation efficiency. Furthermore, the scattered arrangement of excess folded ducts not only increases operational complexity but may also affect on-site work efficiency and safety. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated intelligent device for limited space, which solves the problem of ineffective management of existing folded air ducts and provides intelligent control and limiting of the extension length of the folded air duct.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a confined space integrated intelligent device, comprising a housing, a fan, and a retractable foldable duct. The fan is disposed within the housing and communicates with the foldable duct. The foldable duct includes a flexible hose and multiple rigid frames arranged at equal intervals along the length of the flexible hose. The foldable duct can switch between a retracted state where adjacent rigid frames are close to each other and an extended state where adjacent rigid frames are far apart. The foldable duct in the retracted state can be stored within the housing. The housing is provided with a first stop, a detector, a guide rail, and a controller located on the side of the foldable duct. The guide rail extends along the axial direction of the foldable duct. The first stop is slidably disposed on the guide rail. The controller receives a target extension length of the foldable duct input by the user. The detector detects the position of each rigid frame. The controller determines the corresponding target rigid frame based on the target extension length and controls the first stop to slide to the target rigid frame to fix the remaining foldable duct in the retracted state.

[0005] After adopting the above technical solution, the present invention has the following advantages: In the non-use state, the folding duct can be stored in the housing to form an integrated and compact structure with a small overall volume, which is convenient for transportation and storage and adapts to the carrying needs of various working environments. When used for ventilation operations in enclosed spaces such as cable wells, drainage pipes, and underground trenches, the user can input the required target extension length of the folding duct through the controller. The detector collects the position information of each rigid frame in real time and feeds it back to the controller. The controller determines the corresponding target rigid frame according to the target extension length and controls the first stop to slide along the guide rail to the designated position to limit and fix the folding duct of the un-expanded part. This realizes intelligent adjustment and precise positioning of the extension length of the folding duct, and prevents it from loosening, shaking or accidentally slipping out during use, thereby improving the stability and safety of the device operation. At the same time, it minimizes airflow loss or resistance increase caused by excessively long folding ducts, significantly enhancing ventilation efficiency. In addition, it avoids the problem of scattered folding ducts, improving the cleanliness and ease of operation on site.

[0006] Furthermore, the housing is provided with at least two guide rails located on opposite sides of the folded air duct, and the first stop members on the opposite sides of the guide rails are respectively fixed to the opposite sides of the rigid frame.

[0007] Compared with the single-sided limiting method, the double-sided limiting design, by adopting the aforementioned technical solution, can prevent the folded air duct from shifting, tilting or rotating during use, thereby achieving a more reliable limiting and fixing effect and significantly improving the overall structural stability and operational reliability of the device.

[0008] Furthermore, the first stop has a friction surface facing the rigid frame, and the friction surface of the first stop acts on the rigid frame to generate resistance.

[0009] Using the aforementioned technical solution, when the first stopper slides along the guide rail to the target rigid frame position, its friction surface on the side facing the rigid frame contacts the frame surface and generates limiting resistance, thereby achieving rapid and stable fixing of the un-deployed folded duct. This friction limiting method features rapid response and reliable operation. Compared with traditional mechanical buckle or pin-type locking structures, it does not require complex linkage mechanisms, resulting in a simpler overall structure that is easier to manufacture and maintain.

[0010] Furthermore, the friction surface is flexible.

[0011] By adopting the aforementioned technical solution, when in contact with rigid frames of different shapes, sizes, or slightly uneven surfaces, the flexible material can undergo slight deformation according to the surface contour of the rigid frame, fitting as closely as possible and improving the reliability of the limit. The flexible friction surface not only enhances the adaptability of the stop to frames of different shapes or surface conditions, but also effectively reduces the risk of wear during sliding, thereby improving the durability and stability of the limit structure.

[0012] Furthermore, the housing is provided with an opening for the folded air duct to extend out, and a second stop is provided on the side near the opening. The second stop is configured to form a limiting engagement with the rigid frame located on the outermost side of the housing during the movement of the first stop along the guide rail or during the retraction of the folded air duct into the housing.

[0013] Through the above technical solution, the second stop, acting as an auxiliary limiting structure, can still exert a limiting effect on the outermost rigid frame inside the housing while the first stop is moving along the guide rail and has not yet completed its positioning. This prevents the folded duct from sliding out or tilting due to its own weight or external forces, thus improving the safety and stability of the operation. Furthermore, during the retraction of the folded duct into the housing, the second stop provides a continuous limiting force on the outermost rigid frame, ensuring a smooth and orderly duct retraction process and minimizing the risk of jamming or misalignment, further improving the reliability and ease of operation of the device.

[0014] Furthermore, the housing is provided with at least two second stoppers located on opposite sides of the folded air duct to limit the rigid frame on both sides.

[0015] Through the above technical solution, the second stopper set on both sides acts on the two sides of the rigid frame to form symmetrical limit. Compared with the single-sided limit method, it can prevent the air duct from shifting, rotating or tilting during operation as much as possible, and improve the overall limit effect.

[0016] Furthermore, the second stop includes a mounting shaft rotatably mounted on the housing, a limiting rod hinged to the mounting shaft, and an elastic element connecting the limiting rod and the mounting shaft. The limiting rod has a first position, a second position, and a third position. Under the action of the elastic element, the limiting rod forms a limiting engagement with the outermost rigid frame of the folded duct in the first position. During the process of the folded duct retracting into the housing, the limiting rod overcomes the elastic force of the elastic element and swings to the second position to allow the rigid frame to pass. By rotating the mounting shaft, the limiting rod is deflected relative to the folded duct to the third position to release the limiting state on the outermost rigid frame.

[0017] With the above technical solution, during the process of the first stop moving along the guide rail and not yet completing the positioning, the limiting rod is naturally in the first position under the action of the elastic member, which can apply a limiting effect to the rigid frame located on the outermost side of the shell. When the folded air duct is retracted into the shell, the rigid frame pushes the limiting rod to overcome the elastic force and swing to the second position, so that it is separated from the frame path, realizing the smooth retraction of the air duct. Furthermore, by rotating the mounting shaft, the limiting rod is driven to deflect to the third position, so that it is separated from the folded air duct path, ensuring as much as possible that the folded air duct is not obstructed during the extension process.

[0018] Furthermore, the housing is provided with at least two support members located on opposite sides of the folded air duct, and a receiving channel for accommodating the folded air duct is formed between the support members on opposite sides.

[0019] Through the above technical solution, the receiving channel formed by the double-sided support provides a clear extension and retraction path for the folded air duct, effectively preventing the air duct from bending, shifting or getting stuck during the extension or retraction process, improving the smoothness and stability of operation. At the same time, the existence of the receiving channel helps to achieve the neat arrangement of the folded air duct in the storage state, avoiding the problems of tangling or misalignment as much as possible.

[0020] Furthermore, the support member has an arc-shaped guide surface on the side near the opening of the housing.

[0021] Through the above technical solution, during the extension or retraction of the folding duct, the arc-shaped guide surface can reduce the hard contact between it and the support components, lower frictional resistance, and minimize wear or structural damage caused by collisions. Simultaneously, the arc-shaped guide surface provides excellent guidance for the folding duct, helping it to smoothly align with the receiving channel, improving the smoothness and accuracy of the retraction and unfolding actions, and further enhancing the ease of operation and efficiency of the device.

[0022] Furthermore, the detector is a photoelectric sensor or a magnetic induction sensor, used to identify the position information of each rigid frame and transmit the signal to the controller.

[0023] Through the above technical solutions, the detector uses photoelectric sensors or magnetic induction sensors, both of which are non-contact detection elements. They can accurately identify the position information of each rigid frame without interfering with the normal movement of the folded air duct. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the integrated intelligent device in a confined space according to the present invention;

[0026] Figure 2This is a structural schematic diagram of the integrated intelligent device in confined space according to another perspective of the present invention;

[0027] Figure 3 This is a schematic diagram of the opening being opened in the integrated intelligent device for confined space according to the present invention;

[0028] Figure 4 This is a schematic diagram showing another perspective of the opening in the integrated intelligent device for confined space of the present invention;

[0029] Figure 5 This is a cross-sectional view of the integrated intelligent device in confined space according to the present invention;

[0030] Figure 6 This is a cross-sectional view of the integrated intelligent device in a confined space according to the present invention from another perspective.

[0031] Figure 7 This is a cross-sectional view of the first stop member of the present invention located on the target rigid frame;

[0032] Figure 8 This is a cross-sectional view of the first stop member of the present invention located on the target rigid frame from another perspective;

[0033] Figure 9 This is a schematic diagram of the extended folded air duct structure of the present invention;

[0034] Figure 10 This is a cross-sectional view of the extended folded air duct of the present invention;

[0035] Figure 11 This is a cross-sectional view of the folded duct of the present invention from another perspective;

[0036] In the diagram, 10 is the housing; 11 is the opening; 12 is the intermediate partition; 13 is the sealing pin; 14 is the flip-up side panel; 15 is the alarm light; and 16 is the display screen.

[0037] 20. Fan;

[0038] 30. Folded air duct; 301. Flexible hose; 302. Rigid frame;

[0039] 40. First stop; 401. Friction surface; 41. Detector; 42. Guide rail;

[0040] 50. Second stop; 501. Mounting shaft; 502. Limiting rod; 503. Elastic element;

[0041] 60. Support component; 61. Receiving channel; 62. Arc-shaped guide surface;

[0042] 70. Storage battery;

[0043] 80. Gas sensor. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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.

[0045] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein.

[0046] It should be understood that in the various embodiments of the present invention, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0047] It should be understood that in this invention, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0048] It should be understood that in this invention, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0049] The technical solution of the present invention will be described in detail below with reference to specific embodiments. The following specific embodiments may be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0050] like Figures 1 to 11As shown, this invention provides an integrated intelligent device for confined spaces, suitable for ventilation in enclosed spaces such as cable wells, drainage pipes, and underground trenches. The integrated intelligent device includes a housing 10, a fan 20, and a retractable folding duct 30. The fan 20 is located inside the housing 10 and connected to the folding duct 30. The fan 20 is an axial flow fan. The housing 10 has a middle partition 12. The fan 20 and the folding duct 30 are located above the middle partition 12. Below the middle partition 12 are a battery 70 and an inverter. The battery 70 can be charged and discharged, enabling the device to be used in different situations. The inverter can convert the DC power of the battery 70 into AC power. A gas sensor 80 and a controller are installed inside the housing 10. The gas sensor 80 and the controller are connected. The gas sensor 80 can detect combustible gases, carbon monoxide, hydrogen sulfide, oxygen, temperature, and humidity. The housing 10 is provided with an opening 11 for the folded air duct 30 to enter and exit, and a flip-up side plate 14 for closing the opening 11. Sealing pins 13 are provided on the sides of both sides of the flip-up side plate 14. By providing sealing pins 13, the flip-up side plate 14 can be opened by disassembling the sealing pins 13 and the housing 10 when the opening 11 needs to be opened.

[0051] The folding duct 30 includes a flexible hose 301 and multiple rigid frames 302 arranged at equal intervals along the length of the flexible hose 301. The folding duct 30 can switch between a retracted state where adjacent rigid frames 302 are close to each other and an unfolded state where adjacent rigid frames 302 are far apart. When in the retracted state, the folding duct 30 can be stored inside the housing 10. When not in use, the folding duct 30 can be stored inside the housing 10, forming an integrated and compact structure with a small overall volume, which is convenient for transportation and storage and can meet the carrying needs of various working environments.

[0052] To control the extension length of the folded duct 30, the housing 10 includes a first stop 40, a detector 41, a guide rail 42, and a controller located on the side of the folded duct 30. The guide rail 42 extends along the axial direction of the folded duct 30. The first stop 40 is slidably mounted on the guide rail 42. The controller receives the target extension length of the folded duct 30 input by the user. The detector 41 detects the position of each rigid frame 302. The controller determines the corresponding target rigid frame 302 based on the target extension length and controls the first stop 40 to slide to the target rigid frame 302 to fix the remaining folded duct 30 in its retracted state. This achieves intelligent adjustment and precise positioning of the extension length of the folded duct 30, preventing it from loosening, shaking, or accidentally slipping out during use, thus improving the stability and safety of the device operation. At the same time, it minimizes airflow loss or increased resistance caused by excessively long folded ducts 30, significantly enhancing ventilation efficiency. Furthermore, it avoids the problem of scattered folded ducts 30, improving the neatness and ease of operation on site.

[0053] It should be noted that a servo motor is installed on one side of the guide rail 42 and connected to the first stop 40 through a gear and rack transmission mechanism. The servo motor drives the first stop 40 to move along the guide rail 42 to the designated position.

[0054] Furthermore, the housing 10 is provided with at least two guide rails 42 located on opposite sides of the folded duct 30, and the first stop members 40 on the opposite sides of the guide rails 42 are respectively fixed to opposite sides of the rigid frame 302. Compared with the single-sided limiting method, the double-sided limiting design prevents the folded duct 30 from shifting, tilting or rotating during use as much as possible, thereby achieving a more reliable limiting and fixing effect and significantly improving the overall structural stability and operational reliability of the device.

[0055] Preferably, the housing 10 is provided with two guide rails 42, located on the left and right sides of the folded duct 30. A first stop 40 on the guide rail 42 effectively fixes the folded duct. The first stop 40 has a friction surface 401 facing the rigid frame 302. When the first stop 40 slides along the guide rail 42 to the target rigid frame 302, its friction surface 401 facing the rigid frame 302 contacts the frame surface and generates limiting resistance, thereby achieving rapid and stable fixing of the un-unfolded portion of the folded duct 30. This friction limiting method features rapid response and reliable operation. Compared to traditional mechanical snap-fit ​​or pin-type locking structures, it eliminates the need for complex linkage mechanisms, resulting in a simpler overall structure that is easier to manufacture and maintain.

[0056] Furthermore, the friction surface 401 is flexible. When in contact with rigid frames 302 of different shapes, sizes, or slightly uneven surfaces, the flexible material can undergo slight deformation according to the surface contour of the rigid frame 302, fitting as closely as possible and improving the reliability of the limit. The flexible friction surface 401 not only enhances the adaptability of the stop to frames of different shapes or surface conditions, but also effectively reduces the risk of wear during sliding, improving the durability and stability of the limit structure.

[0057] It should be noted that the friction surface 401 can be made of materials such as rubber.

[0058] During the process where the first stop 40 moves along the guide rail 42 but has not yet completed its positioning, the folded duct 30 is prone to loosening due to loss of fixation. Therefore, in this application, the body is provided with an opening 11 for the folded duct 30 to extend out, and a second stop 50 is provided on the side near the opening 11. The second stop 50 serves as an auxiliary limiting structure. Even during the process where the first stop 40 moves along the guide rail 42 but has not yet completed its positioning, it can still apply a limiting effect to the outermost rigid frame 302 located within the housing 10, thereby preventing the folded duct 30 from slipping out, tilting, or undergoing other unexpected displacements due to its own weight or external forces, thus improving the safety and stability of the operation. Furthermore, during the process of the folded duct 30 retracting into the housing 10, the second stop 50 can provide a continuous limiting force to the outermost rigid frame 302, ensuring that the duct retraction action is performed smoothly and orderly, thereby minimizing problems such as jamming or misalignment, and further improving the reliability and ease of operation of the device.

[0059] To improve the reliability of the limiting mechanism, the housing 10 is provided with at least two second stoppers 50 located on opposite sides of the folded duct 30 to limit the rigid frame 302 on both sides. The two-sided second stoppers 50 act on the two side surfaces of the rigid frame 302 respectively, forming a symmetrical limiting mechanism. Compared with the single-sided limiting method, this method can prevent the duct from shifting, rotating or tilting during operation, thus improving the overall limiting effect.

[0060] Preferably, there are two second stoppers 50, which are located on the upper and lower sides of the folded air duct 30 and are separate from the first stopper 40.

[0061] The second stop 50 includes a mounting shaft 501 rotatably mounted on the housing 10, a limiting rod 502 hinged to the mounting shaft 501, and an elastic member 503 connecting the limiting rod 502 and the mounting shaft 501. The limiting rod 502 has a first position, a second position, and a third position. Under the action of the elastic member 503, the limiting rod 502 forms a limiting engagement with the outermost rigid frame 302 of the folded air duct 30 in the first position. During the process of the folded air duct 30 retracting into the housing 10, the limiting rod 502 overcomes the elastic force of the elastic member 503 and swings to the second position to allow the rigid frame 302 to pass through. By rotating the mounting shaft 501, the limiting rod 502 is deflected relative to the folded air duct 30 to the third position, causing it to disengage from the path of the folded air duct 30, thereby releasing the limiting state on the outermost rigid frame 302 and ensuring that the folded air duct 30 is not obstructed during its extension.

[0062] It should be noted that the mounting shaft 501 is arranged along the axial direction of the folded air duct 30. When the limiting rod 502 is in the first position, the limiting rod 502 is arranged inward with the axial direction of the folded air duct 30 to limit the folded air duct 30. When the folded air duct 30 is retracted, the rigid frame 302 pushes the limiting rod 502 downward to allow the rigid frame 302 to pass through. Therefore, the limiting rod 502 provides one-way limiting.

[0063] Furthermore, when the folded duct 30 extends or retracts, it is prone to tilting due to unilateral external force, leading to disordered placement of the folded duct 30 within the housing 10. Therefore, in this application, the housing 10 is provided with at least two support members 60 located on opposite sides of the folded duct 30, forming a receiving channel 61 between the support members 60 on opposite sides to accommodate the folded duct 30. The receiving channel 61 formed by the two support members 60 provides a clear extension and retraction path for the folded duct 30, effectively preventing bending, displacement, or jamming during extension or retraction, improving operational smoothness and stability. Simultaneously, the presence of the receiving channel 61 helps to achieve neat arrangement of the folded duct 30 in the retracted state, minimizing tangling or misalignment.

[0064] Preferably, there are two support members 60, located above and below the folded air duct 30. The support member 60 is an arc-shaped support block adapted to the folded air duct 30. The second stop member 50 is also provided on the arc-shaped support block. The mounting shaft 501 is provided with a handle for easy gripping, which facilitates switching the position of the limit rod 502. The handle is attached to the arc-shaped support block. The surface of the arc-shaped support block is provided with a corrugated friction surface 401, so that the handle can be kept in the current position by friction, thereby keeping the limit rod 502 in the current position.

[0065] Furthermore, the support member 60 has an arc-shaped guide surface 62 on the side near the opening 11 of the housing 10. During the extension or retraction of the folded air duct 30, the arc-shaped guide surface 62 can reduce the hard contact between it and the support member 60, reduce frictional resistance, and minimize wear or structural damage caused by collision. At the same time, the arc-shaped guide surface 62 has a good guiding effect on the folded air duct 30, which helps the folded air duct 30 to be smoothly aligned with the receiving channel 61, improves the smoothness and accuracy of the storage and unfolding actions, and further improves the ease of operation and efficiency of the device.

[0066] Among them, detector 41 is a photoelectric sensor used to identify the position information of each rigid frame 302 and transmit the signal to the controller. It is a non-contact detection element, which can accurately identify the position information of each rigid frame 302 without interfering with the normal movement of the folded air duct 30.

[0067] To facilitate the handling of the integrated intelligent confined space device, handles can be installed on the top and sides of the housing 10 for easy transport of the testing chamber. An alarm light 15 and a display screen 16 are also installed on the top of the housing 10. The alarm light 15, display screen 16, and controller are connected. When the oxygen content in the confined space is low, or the concentration of other harmful gases is too high, the alarm light 15 will flash in real time to remind personnel that the sealed space is unsuitable for work. The display screen 16 can display the gas conditions inside the confined space in real time, providing a clear understanding of the gas situation. The display screen 16 also has an input function, allowing users to input the required length of the folded duct 30.

[0068] When ventilation is required, the sealing pin 13 and housing 10 are removed, the flip-up side panel 14 is opened, and the required length of the folded duct 30 is entered into the display screen 16 based on the distance from the housing 10 to the limited space. The controller receives signals from the photoelectric sensor, calculates the position of the target rigid frame 302, and sends commands to the servo motor, such as... Figure 7 As shown, the first stop 40 is driven to move precisely along the guide rail 42 to the designated position, fixing the target rigid frame 302. Then, as... Figure 8 As shown, rotate the handle to position the second brake element in the third position, as indicated. Figures 9 to 11 As shown, the required folded air duct 30 is pulled out of the housing 10 and inserted into the limited space, and then the fan 20 is turned on.

[0069] After use, turn off the fan 20, turn the handle, and the second brake is in the first position. At this time, store the folded air duct 30 and put it into the housing 10. At this time, the rigid frame 302 pushes the second stop 50 to the second position. When the last rigid frame 302 passes the second stop 50, the second stop 50 is restored to the first position by the elastic force of the elastic member 503, which plays a limiting role for the folded air duct 30. Then, the servo motor drives the first stop 40 to reset, and the first stop 40 fixes the outermost rigid frame 302.

[0070] Understandably, in other embodiments, the detector is a magnetic induction sensor, and a magnetic component is provided on the rigid frame. The position of the rigid frame is obtained by detecting the magnetic component.

[0071] Understandably, in other embodiments, the first stop can also be an elastic ring, which is fitted onto the folded air duct and fixed to the housing. When in use, the folded air duct is pulled, and the deformation of the elastic ring allows the folded air duct to pass over the elastic ring. When pulled to the target length, the elastic ring remains fitted onto the folded air duct, fixing the remaining folded air duct.

[0072] In addition to the preferred embodiments described above, the present invention has other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection claimed by the present invention.

Claims

1. A confined space integrated intelligent device, comprising a housing, a fan, and a retractable foldable duct, wherein the fan is disposed within the housing and communicates with the foldable duct, characterized in that, The folding duct includes a flexible hose and multiple rigid frames arranged at equal intervals along the length of the hose. The folding duct can switch between a retracted state where adjacent rigid frames are close to each other and an unfolded state where adjacent rigid frames are far apart. In the retracted state, the folding duct can be stored in the housing. The housing is provided with a first stop, a detector, a guide rail, and a controller located on the side of the folding duct. The guide rail extends along the axial direction of the folding duct. The first stop is slidably disposed on the guide rail. The controller receives the target extension length of the folding duct input by the user. The detector detects the position of each rigid frame. Based on the target extension length and the fixed spacing between the rigid frames, the controller calculates the number of rigid frames to be unfolded, determines the corresponding number of rigid frames as the target rigid frames, and controls the first stop to slide to the target rigid frame to fix the remaining folding duct in the retracted state.

2. The integrated intelligent device for confined space according to claim 1, characterized in that, The housing is provided with at least two guide rails located on opposite sides of the folded air duct, and the first stop members on the opposite sides of the guide rails are respectively fixed to the opposite sides of the rigid frame.

3. The integrated intelligent device for confined space according to claim 2, characterized in that, The first stop has a friction surface facing the rigid frame, and the friction surface of the first stop acts on the rigid frame to generate resistance.

4. The integrated intelligent device for confined space according to claim 3, characterized in that, The friction surface is flexible.

5. The integrated intelligent device for confined space according to claim 1, characterized in that, The housing has an opening for the folded air duct to extend out, and a second stop is provided on the side near the opening. The second stop is configured to form a limiting engagement with the rigid frame located on the outermost side of the housing during the movement of the first stop along the guide rail or during the retraction of the folded air duct into the housing.

6. The integrated intelligent device for confined space according to claim 5, characterized in that, The housing is provided with at least two second stop members located on opposite sides of the folded air duct to limit the rigid frame on both sides.

7. The integrated intelligent device for confined space according to claim 5 or 6, characterized in that, The second stop includes a mounting shaft rotatably mounted on the housing, a limiting rod hinged to the mounting shaft, and an elastic element connecting the limiting rod and the mounting shaft. The limiting rod has a first position, a second position, and a third position. Under the action of the elastic element, the limiting rod forms a limiting engagement with the outermost rigid frame of the folded air duct in the first position. During the process of the folded air duct retracting into the housing, the limiting rod overcomes the elastic force of the elastic element and swings to the second position to allow the rigid frame to pass. By rotating the mounting shaft, the limiting rod is deflected relative to the folded air duct to the third position to release the limiting state on the outermost rigid frame.

8. The integrated intelligent device for confined space according to claim 1, characterized in that, The housing is provided with at least two support members located on opposite sides of the folded air duct, and a receiving channel for accommodating the folded air duct is formed between the support members on opposite sides.

9. The integrated intelligent device for confined space according to claim 8, characterized in that, The support member has an arc-shaped guide surface on the side near the opening of the housing.

10. The integrated intelligent device for confined space according to claim 1, characterized in that, The detector is a photoelectric sensor or a magnetic induction sensor, used to identify the position information of each rigid frame and transmit the signal to the controller.

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