Ceiling fresh air indoor unit convenient to maintain

Abstract

The invention relates to the technical field of fresh air systems, discloses a ceiling fresh air indoor unit convenient to maintain, and aims to solve the problems that an existing ceiling fresh air indoor unit cannot be finely adjusted after being hoisted, is poor in mounting adaptability and is inconvenient to maintain. The core structure of the fresh air indoor unit comprises a fresh air indoor unit body, a hoisting rail assembly and a multi-dimensional adjusting structure. The fresh air indoor unit main body is provided with an openable maintenance door and three targeted access holes, so that quick maintenance of core parts is realized; the multi-dimensional adjusting structure achieves front-back, left-right and vertical three-dimensional position fine adjustment through cooperation of a hoisting assembly, a limiting piece, a folding support and the like. Wherein the suspension assembly has a multi-dimensional adjustment design, the transverse total adjustment stroke and angle adjustment can be achieved, the ceiling punching positioning precision requirement is lowered, repeated measurement is not needed, and the ceiling punching positioning device can adapt to ceiling environments with different flatness.

Description

Technical Field

[0001] This invention relates to the field of fresh air system technology, and in particular to a ceiling-mounted fresh air indoor unit that is easy to maintain. Background Technology

[0002] A fresh air system is an independent air handling system consisting of a supply air system and an exhaust air system. It is an open-loop circulation system, mainly composed of a motor, fan, and air filter. Its working principle is that the motor and fan drive indoor air circulation, pollutants in the air are removed or adsorbed by the filter, and a large number of negative ions are generated. These negative ion airflows are then expelled by the fan, achieving air purification. It can filter, disinfect, sterilize, oxygenate, and preheat (in winter) the air entering the room, and is used in residential, medical, and industrial applications. With increasing demands for indoor air quality, fresh air systems have become widely used in various buildings, with ceiling-mounted indoor fresh air units being the mainstream choice due to their space-saving advantage. However, traditional ceiling-mounted indoor fresh air units have fixed mounting brackets, requiring precise measurement of the spacing and height of the ceiling expansion bolts. If the measurement is inaccurate, re-drilling is necessary, reducing installation efficiency and potentially damaging the ceiling structure. Therefore, the development of a ceiling-mounted indoor fresh air unit that is easy to maintain is necessary. Summary of the Invention

[0003] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a ceiling-mounted fresh air indoor unit that is easy to maintain, has a three-dimensional position fine adjustment function, multiple maintenance channels, and convenient installation and positioning, so as to achieve the effects of installation without repeated measurement, maintenance without overall disassembly, and flexible position adjustment.

[0004] The present invention is achieved by the following technical solution: a ceiling-mounted fresh air indoor unit that is easy to maintain, comprising a fresh air indoor unit body, two sets of lower mounting rails, a mounting assembly, two sets of upper mounting rails, a lower limit component, an upper limit component, a folding bracket, and a suspension assembly; The two sets of lower lifting rails are arranged symmetrically in the front-to-back direction, and the two sets of upper lifting rails are arranged parallel above the two sets of lower lifting rails; The hoisting assembly is installed at both ends of the lower hoisting rail. The main body of the fresh air indoor unit is hoisted below the lower hoisting rail by the hoisting assembly, and the front and rear positions can be finely adjusted by the hoisting assembly. The lower limit component is symmetrically installed on the top of the lower mounting rail, the upper limit component is symmetrically installed on the bottom of the upper mounting rail, and the folding bracket is installed between the lower limit component and the upper limit component. By adjusting the position of the lower limit component, the upper limit component is driven to slide synchronously to achieve fine adjustment of the left and right position of the main body of the fresh air indoor unit; the vertical height of the main body of the fresh air indoor unit is adjusted by extending and retracting the folding bracket. The suspension components are symmetrically installed on the top outer side of the upper suspension rail to fix the upper suspension rail to the ceiling, and can achieve fine adjustment of the installation position and angle adaptation. The main body of the fresh air indoor unit is equipped with an openable maintenance door on the front side wall, and three rectangular inspection ports with removable covers are provided at the bottom, which facilitates targeted maintenance by staff from the bottom.

[0005] As a further improvement to the above solution, the main body of the fresh air indoor unit includes an indoor unit housing, the inner cavity of which is divided into a fan cavity, a heat exchange cavity, a filter cavity and an electrical circuit cavity by a partition; the two end side walls of the indoor unit housing are fixed with symmetrical front and rear lifting lugs, and the lifting lugs are provided with installation slots; the three rectangular inspection ports are respectively for the fan cavity, the heat exchange cavity and the electrical circuit cavity.

[0006] As a further improvement to the above solution, the upper lifting rail has the same structure as the lower lifting rail. The four sides of both the lower and upper lifting rails are provided with sliding groove structures, and the side walls at both ends of both the lower and upper lifting rails are provided with multiple positioning holes.

[0007] As a further improvement to the above solution, the hoisting assembly includes an adjustable hoisting rail, a fixing plate, and an adjusting component; The vertical cross-section of the adjusting rail is the same as that of the lower lifting rail, and multiple adjusting holes are evenly provided on the side wall; the fixing plate is installed in the top cavity of the adjusting rail, and the upper part is fixed to the lower lifting rail. The lower lifting rail, the adjusting rail, and the fixing plate are all provided with matching fixing holes, and are fixedly connected by long bolts passing through the fixing holes. The adjusting component is installed at the bottom of the adjusting rail.

[0008] As a further improvement to the above solution, the adjustment component includes a U-shaped bracket, the inner side of the side plate of the U-shaped bracket is provided with a limiting slider that matches the sliding groove on the side of the adjustment rail, and the side wall of the U-shaped bracket is provided with a locking component, which is used to lock and unlock the position of the adjustment component on the adjustment rail. An L-shaped bracket is fixed to the bottom of the U-shaped bracket, and a lifting screw is vertically fixed inside the L-shaped bracket. Two clamping nuts for clamping the lifting lugs are installed at the bottom of the lifting screw.

[0009] As a further improvement to the above solution, the locking assembly includes an adjusting member, a limiting baffle, and a compression spring; The adjusting component consists of an integrated rod and a handle. The rod passes through the limiting slider and can be inserted into the adjusting hole. The limiting baffle is sleeved and fixed on the outer wall of the rod. The compression spring is disposed between the limiting baffle and the inner wall of the limiting slider. In its natural state, the compression spring is compressed, pushing the limiting baffle to drive the rod of the adjusting component into the adjusting hole, thereby locking the position. When the position needs to be adjusted, the operator pulls the handle outward to overcome the spring force of the compression spring and pull the rod out of the adjusting hole, thus releasing the lock.

[0010] As a further improvement to the above solution, the lower limit component includes a limiting sliding component, the structure of which is consistent with the U-shaped bracket with a limiting slider, and can slide along the lower lifting rail groove. The top of the limiting sliding component is symmetrically welded with connecting ear plates, and double-headed bolts are installed between the connecting ear plates, and the end of the folding bracket is connected to the double-headed bolts; The side wall of the limiting sliding member is provided with a positioning component. The structure of the positioning component is the same as that of the locking component of the adjustment component. Its plug rod can be inserted into the positioning hole to achieve locking. The upper limit component has the same structure as the lower limit component, but it does not have a positioning component.

[0011] As a further improvement to the above solution, the folding bracket includes two sets of connecting plates 1 and 2 arranged in an alternating manner. The ends of the connecting plates 1 and 2 are provided with mounting holes that are clearance-fitted with double-headed bolts. The middle of the connecting plates 1 and 2 is hinged by a support shaft. Reinforcing rods are installed between the two ends of the two sets of connecting plates 1 and 2. The support shaft and one of the reinforcing rods are each welded with a U-shaped bracket in the middle. The U-shaped bracket suspends an adjustment hook with opposite thread directions. An adjustment bracket is connected between the two adjustment hooks, and the end of the adjustment bracket is threadedly connected to the adjustment hook.

[0012] As a further improvement to the above solution, the suspension assembly includes a lifting adjustment component, a lifting plate, and countersunk bolts; The structure of the hoisting adjustment component is the same as that of the limiting sliding component with positioning assembly, and it can slide along the upper hoisting rail groove and be locked by the positioning assembly; The lifting plate is installed on the top of the lifting adjustment component by countersunk bolts. The lifting plate has horizontal waist-shaped countersunk bolt holes, and the top of the lifting adjustment component has mounting holes that match the countersunk bolts. The lifting plate and the lifting adjustment component can be angled.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention achieves fine-tuning of the three-dimensional position of the main body of the fresh air indoor unit in front, back, left, right and vertical directions, as well as adjustment of the hoisting angle through the coordinated design of the hoisting components, lower limit components, folding brackets and hoisting components. It can accurately avoid interference from pipelines in the ceiling, adapt to different installation environments, and does not require overall disassembly and reassembly. The multi-dimensional adjustment design of the suspension component of this invention improves the flexibility of installation and positioning, eliminates the need for repeated measurement and drilling, reduces the accuracy requirements for ceiling drilling and positioning, and can adapt to ceiling environments with different flatness. This invention enables rapid filter replacement and targeted maintenance of core components by setting up a maintenance door, along with three targeted inspection ports at the bottom and a removable cover, without disassembling the entire machine or damaging the ceiling. Attached Figure Description

[0014] Figure 1 A three-dimensional representation of the ceiling-mounted fresh air indoor unit of the present invention, which is easy to maintain; Figure 2 This is a front view of the ceiling-mounted fresh air indoor unit of the present invention, which is easy to maintain. Figure 3 This is an enlarged view of part A of the ceiling-mounted fresh air indoor unit of the present invention, which is easy to maintain; Figure 4 This is a side view of the ceiling-mounted fresh air indoor unit of the present invention, which is designed for easy maintenance. Figure 5 This is an enlarged view of part B of the ceiling-mounted fresh air indoor unit of the present invention, which is easy to maintain; Figure 6 This is a three-dimensional representation of the main body of the ceiling-mounted fresh air indoor unit, which is designed for easy maintenance according to the present invention. Figure 7 This is a top view of the lower mounting rail of the ceiling-mounted fresh air indoor unit of the present invention, which is designed for easy maintenance. Figure 8 This is a three-dimensional representation of the mounting components of the ceiling-mounted fresh air indoor unit of the present invention, which facilitates maintenance. Figure 9 A three-dimensional perspective view of the adjustment components of the ceiling-mounted fresh air indoor unit of the present invention, which is easy to maintain; Figure 10 This is a front view of the adjustment components of the ceiling-mounted fresh air indoor unit of the present invention, which is designed for easy maintenance. Figure 11 This is a side view of the lower limit component of the ceiling-mounted fresh air indoor unit of the present invention, which is designed for easy maintenance, when it is installed on the lower mounting rail. Figure 12 A three-dimensional representation of the folding bracket for the ceiling-mounted fresh air indoor unit of this invention, which facilitates maintenance. Figure 13 This is a side view of the mounting components of the ceiling-mounted fresh air indoor unit of the present invention, which is designed for easy maintenance.

[0015] Explanation of key symbols: 1. Main body of the indoor air unit; 11. Indoor unit housing; 12. Lifting lugs; 13. Maintenance door; 14. Inspection port; 2. Lower lifting rail; 21. Positioning socket; 22. Long bolt; 23. Fixing hole; 3. Lifting assembly; 31. Adjusting rail; 311. Adjusting socket; 32. Fixing plate; 33. Adjusting assembly; 331. U-shaped bracket; 332. Limiting slider; 333. Adjusting component; 334. Limiting baffle; 335. Compression spring; 336. L-shaped bracket; 33 7. Lifting screw; 338. Compression nut; 4. Upper lifting rail; 5. Lower limit component; 51. Limiting sliding component; 52. Connecting ear plate; 53. Double-ended bolt; 54. Positioning assembly; 6. Upper limit component; 7. Folding bracket; 71. Connecting plate one; 72. Connecting plate two; 73. Reinforcing rod; 74. Support shaft rod; 75. U-shaped bracket; 76. Adjusting hook; 77. Adjusting bracket; 8. Suspension assembly; 81. Lifting adjustment component; 82. Lifting plate; 83. Countersunk bolt. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0017] Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0018] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0019] To keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of known functions and known components are omitted.

[0020] Please combine Figure 1-13As shown in the figure, an embodiment of the present invention provides a ceiling-mounted fresh air indoor unit that is easy to maintain. It includes a main body 1, two sets of lower mounting rails 2, a mounting assembly 3, and an upper mounting rail 4. The main body 1 is the core working unit for fresh air exchange, integrating core components such as a fan, heat exchanger, filter, and circuit module. Its structural design focuses on optimizing ease of maintenance and sealing performance. Figure 6 As shown, the main body 1 of the fresh air indoor unit includes an indoor unit housing 11 (the inner cavity of the indoor unit housing 11 is divided into a fan cavity, a heat exchange cavity, a filter cavity and a circuit cavity by a partition, and a sealing partition is provided between each cavity to avoid airflow interference and noise transmission). Two lifting lugs 12 are fixed to the side walls at both ends of the indoor unit housing 11 by Phillips head countersunk screws. The two lifting lugs 12 are symmetrically arranged front and rear. The lifting lugs 12 have installation slots for use with the lifting assembly 3 to achieve lifting. The front side wall of the fresh air indoor unit 1 is equipped with a maintenance door 13 (the opening angle of the maintenance door 13 is greater than 90°) through a hinge, which facilitates quick replacement of the filter inside the indoor unit housing 11. The bottom of the indoor unit housing 11 is provided with three rectangular inspection ports 14. A detachable dust cover is provided at the edge of the inspection port 14 (one side of the dust cover is movably connected by a hinge, and the other side is detachably connected by a latch), which correspond to the circuit module, fan assembly and heat exchanger area respectively, which facilitates the staff to perform targeted maintenance from the bottom without disassembling the whole unit. After the traditional ceiling-mounted fresh air unit is installed, its front-to-back, left-to-right, and vertical positions cannot be fine-tuned. If it interferes with the pipes (electrical wires, water pipes, air conditioning pipes) within the ceiling, it must be completely disassembled and reinstalled, which is cumbersome. Figure 1-5 As shown, two sets of lower hanging rails 2 are arranged symmetrically in the front-to-back direction. Each of the four transverse surfaces of the lower hanging rails 2 is provided with a sliding groove structure (the inner wall of the sliding groove is anodized to reduce sliding friction resistance). The structure of the two sets of upper hanging rails 4 is the same as that of the two sets of lower hanging rails 2 (both the two sets of lower hanging rails 2 and the two sets of upper hanging rails 4 are aluminum alloy extruded parts. Aluminum alloy has the characteristics of lightweight and high strength, which can reduce the overall weight and reduce the load-bearing pressure on the ceiling while ensuring the support strength). The two sets of upper hanging rails 4 are arranged parallel above the two sets of lower hanging rails 2. The two sets of lower hanging rails 2 and the two sets of upper hanging rails 4 provide basic support for multi-dimensional fine adjustment. Lifting components 3 are installed at both ends of the two sets of lower hanging rails 2. After the main body of the fresh air indoor unit 1 is lifted by the lifting components 3, the front-to-back position can be finely adjusted. Long bolts 22 for fixing the lifting components 3 are vertically provided in the inner cavity of the end of the lower hanging rails 2, which facilitates the individual replacement of the lifting components 3. Two sets of lower limit pieces 5 are symmetrically installed on the top of the lower mounting rail 2, and can slide on the lower mounting rail 2. Two sets of upper limit pieces 6 are symmetrically installed on the bottom of the upper mounting rail 4, and can slide on the upper mounting rail 4. The positions of the two sets of lower limit pieces 5 and the two sets of upper limit pieces 6 can be adjusted synchronously to adjust the left and right position of the main body 1 of the fresh air indoor unit. A folding bracket 7 is provided between the lower limit pieces 5 and the upper limit pieces 6. Utilizing the foldable characteristic of the folding bracket 7, the position of the main body 1 of the fresh air indoor unit can be adjusted. The position of the main body 1 after hoisting; two sets of suspension components 8 are symmetrically installed on the top of the upper hoisting rail 4, and the two sets of suspension components 8 are set on the outside of the two sets of upper limit parts 6, which can adjust the position of the suspension components 8 on the upper hoisting rail 4 to match the installation position of the ceiling expansion bolts, so that when the staff drills holes in the ceiling, they do not need to repeatedly measure and position. The lower limit part 5, the upper limit part 6, the folding bracket 7 and the suspension components 8 work together to realize the left and right and vertical position adjustment of the main body 1 of the fresh air indoor unit and the fine adjustment of the installation position of the suspension components 8; The hoisting assembly 3 is a key transition structure connecting the lower hoisting rail 2 and the main body of the fresh air indoor unit 1, and it has both fixing and fine-tuning functions; for example Figure 8 As shown, the hoisting assembly 3 includes an adjusting rail 31, a fixing plate 32 (the fixing plate 32 is a stainless steel stamping part), and an adjusting assembly 33. The vertical cross-section of the adjusting rail 31 is the same as that of the lower hoisting rail 2. Multiple adjusting holes 311 are evenly provided on the side wall of the adjusting rail 31 (e.g., ...). Figure 5 As shown), the fixing plate 32 is clamped and installed in the middle of the top inner cavity of the adjusting rail 31, and the upper part of the fixing plate 32 can be clamped onto the lower lifting rail 2. At the end of the lower lifting rail 2, the middle of the adjusting rail 31, and the middle of the fixing plate 32, vertical fixing holes 23 matching the long bolts 22 are provided (e.g., ...). Figure 7 As shown, the adjusting rail 31 can be fixed to the end of the lower mounting rail 2 using the fixing plate 32, which facilitates the long bolt 22 to pass through the inner cavity of the fixing hole 23 and fix the lower mounting rail 2 and the adjusting rail 31. The adjusting component 33 is installed at the bottom of the adjusting rail 31, and the adjusting component 33 can slide back and forth at the bottom of the adjusting rail 31. By adjusting the position of the adjusting component 33 on the adjusting rail 31, the front and back positions can be finely adjusted after the main body of the fresh air indoor unit 1 is hoisted. The adjustment component 33 is installed at the bottom of the adjustment rail 31 and can slide back and forth along the slide groove of the adjustment rail 31 to achieve fine adjustment of the front and rear position of the main body 1 of the fresh air indoor unit; such as Figure 9 and 10As shown, the adjustment assembly 33 includes a U-shaped bracket 331. Limiting sliders 332, matching the side grooves of the adjustment rail 31, are provided on the inner walls of both side plates of the U-shaped bracket 331. This allows the limiting sliders 332 to engage in the side grooves of the adjustment rail 31. The sliding of the limiting sliders 332 along the side of the adjustment rail 31 ensures stability during fine-tuning of the indoor unit's front and rear positions. Furthermore, the limiting sliders 332 are hollow (e.g., ...). Figure 9 As shown), this reduces the weight of components and lowers the load on the lifting rail. A locking assembly is provided on one side wall of the U-shaped bracket 331. The locking assembly is used to lock and unlock the position of the adjusting component 33 on the adjusting lifting rail 31. The locking assembly includes an adjusting component 333, a limit baffle 334, and a compression spring 335 (as shown). Figure 10 As shown), the adjusting component 333 is composed of an integrated insert rod and a handle. The insert rod on the adjusting component 333 passes through the side wall of the limiting slider 332 and is inserted into the inner cavity of the adjusting socket 311. The fitting clearance between the insert rod and the adjusting socket 311 is 0.05-0.1mm, which can lock the position of the adjusting component 33 on the adjusting rail 31. When the position needs to be adjusted, simply pull the insert rod of the adjusting component 333 out of the inner cavity of the adjusting socket 311 to release the lock; the limiting stop... Plate 334 is threadedly installed on the outer wall of the rod on the adjusting member 333, and the limiting baffle 334 is set in the inner cavity of the limiting slider 332. The compression spring 335 is installed on the outer wall of the rod on the adjusting member 333, and the compression spring 335 is set between the limiting baffle 334 and the inner cavity side wall of the limiting slider 332. By utilizing the elastic force of the compression spring 335, a continuous compression force can be applied to the rod on the adjusting member 333 by squeezing the limiting baffle 334, so that the adjusting member 333 can maintain a continuous state when the position of the adjusting component 33 is locked, ensuring a stable locked state. In its natural state, the compression spring 335 is compressed, pushing the limit baffle 334 to drive the rod of the adjusting component 333 into the adjusting socket 311, thus locking the position. When the position needs to be adjusted, the operator pulls the handle outward to overcome the elasticity of the compression spring 335 and pull the rod out of the adjusting socket 311, thus releasing the lock. At this time, the U-shaped bracket 331 can be pushed to slide along the adjusting rail 31 to the target position. After releasing the handle, the spring returns to its original position and pushes the rod back into the corresponding adjusting socket 311, thus relocking. An L-shaped bracket 336 is welded and fixed to the bottom of the U-shaped bracket 331. A lifting screw 337 is vertically fixed inside the L-shaped bracket 336. The lifting screw 337 can be inserted into the mounting slot on the lifting ear plate 12. Two clamping nuts 338 are installed at the bottom end of the lifting screw 337. During hoisting, the two clamping nuts 338 are respectively set on the upper and lower sides of the lifting ear plate 12. The lifting ear plate 12 is clamped and fixed to the outer wall of the lifting screw 337 by the two clamping nuts 338. The main body 1 of the fresh air indoor unit is fixed by clamping the lifting ear plate 12. Multiple positioning holes 21 are provided on the side walls of both ends of the lower lifting rail 2 and the upper lifting rail 4 (e.g., Figure 3 As shown), the center-to-center distance between adjacent positioning holes 21 is 5mm, which is used to cooperate with the positioning components of the lower limit component 5 and the suspension component 8 to achieve position locking; as shown Figure 11 As shown, the lower limit component 5 includes a limiting slide 51, and the structure of the limiting slide 51 is the same as that of the U-shaped bracket 331 with the limiting slider 332. It can hold the limiting slide 51 in the side groove of the lower lifting rail 2 and allow the limiting slide 51 to slide along the side groove of the lower lifting rail 2. Two connecting ear plates 52 are symmetrically welded to the top of the limiting slide 51, and a double-ended bolt 53 is horizontally installed between the two connecting ear plates 52. The double-ended bolt 53 is used to connect to the end of the folding bracket 7. The positioning component 54 is disposed on the side wall of the limiting slide 51, and its structure is the same as that of the adjusting... The locking assembly consisting of the adjusting component 333, the limiting baffle 334, and the clamping spring 335 in the section component 33 is completely identical. Its insertion rod can be inserted into the positioning insertion hole 21 of the lower hanging rail 2 to realize the locking and unlocking of the position of the lower limiting component 5. The structure of the upper limiting component 6 is the same as that of the lower limiting component 5, but it does not have a positioning component 54. It can slide freely along the side groove of the upper hanging rail 4 to adapt to the telescopic adjustment of the folding bracket 7 and avoid the smoothness of adjustment due to positioning restrictions. After the positioning component 54 of the lower limiting component 5 is unlocked, the lower limiting component 5 is pushed to slide along the lower hanging rail 2. The upper limiting component 6 can be driven to slide synchronously through the folding bracket 7, thereby adjusting the left and right positions of the main body 1 of the fresh air indoor unit. The folding bracket 7 is a vertical height adjustment mechanism, such as... Figure 12 As shown, the folding bracket 7 includes two sets of connecting plates 71 and 72. Both connecting plates 71 and 72 are made of aluminum alloy plates and are staggered. The ends of the connecting plates are provided with mounting holes that fit with the double-headed bolts 53 with clearance, allowing them to rotate around the double-headed bolts 53. The middle of the connecting plates 71 and 72 is provided with hinge holes. The ends of both sets of connecting plates 71 and 72 are connected by bolts with reinforcing rods 73 installed longitudinally to improve the rigidity of the structure. A support shaft 74 is longitudinally installed between the middle of connecting plate 1 71 and connecting plate 2 72. A pin is provided at the end of the support shaft 74, which is clearance-fitted with the hinge hole. The pin passes through the inner cavity of the hinge hole on connecting plate 1 71 and connecting plate 2 72, so that the middle of connecting plate 1 71 and connecting plate 2 72 can rotate around the pin at the end of the support shaft 74. A U-shaped bracket 75 is welded to the middle of the support shaft 74 and one of the reinforcing rods 73. A threaded adjustment hook 76 is suspended on the U-shaped bracket 75. The threads on the two adjustment hooks 76 are in opposite directions. An adjustment bracket 77 is provided between the two adjustment hooks 76, and the end of the adjustment bracket 77 is connected to the adjustment hook 76 by a thread. After the positioning component 54 is released from locking the lower limit component 5, when the adjusting bracket 77 is turned clockwise, the two adjusting hooks 76 move towards each other due to their opposite thread directions, shortening the distance between the U-shaped brackets 75. This pulls the reinforcing rod 73 and the support shaft rod 74 closer together, causing the connecting plate 1 71 and the connecting plate 2 72 to rotate around the pin, unfolding the scissor structure and increasing the vertical distance at the ends of the connecting plates. At the same time, the lower limit component 5 and the upper limit component 6 move closer together along the sliding groove of the hoisting rail, increasing the vertical distance between the upper and lower hoisting rails and lowering the main body 1 of the fresh air indoor unit. Conversely, when the adjusting bracket 77 is turned counterclockwise, the two hooks move in opposite directions, increasing the distance between the U-shaped brackets 75, retracting the scissor structure, and raising the main body 1 of the fresh air indoor unit. During the adjustment process, since the upper limit component 6 has no positioning component, it can slide freely with the movement of the scissor structure, ensuring smooth adjustment. After adjusting to the target height, the lower limit component 5 is locked in place by the positioning component 54 to prevent sliding. Suspension assembly 8 is used to fix the upper mounting rail 4 to the ceiling. It has functions for fine-tuning the position and adapting the angle, and can accommodate the installation deviation of the ceiling expansion bolts, such as... Figure 13 As shown, the suspension assembly 8 includes a hoisting adjustment component 81, a hoisting plate 82, and a countersunk bolt 83. The structure of the hoisting adjustment component 81 is the same as that of the limiting sliding component 51 with the positioning component 54. It can slide along the groove of the upper hoisting rail 4. The position is locked by inserting the rod of the positioning component 54 into the positioning hole 21, which facilitates the adjustment of the corresponding position with the ceiling expansion bolt. The lifting plate 82 is installed on the top of the lifting adjustment component 81 by countersunk bolts 83; the top of the lifting plate 82 has a waist-shaped countersunk bolt hole, the design of which allows for a lateral fine adjustment of ±15mm to accommodate the positional deviation of the ceiling expansion bolts; the top of the lifting adjustment component 81 has a matching mounting hole, and loosening the countersunk bolts 83 can adjust the angle between the lifting plate 82 and the lifting adjustment component 81 to accommodate the installation deviation of the ceiling expansion bolts; By sliding the lifting adjustment component 81 along the upper lifting rail 4, a horizontal positional adjustment of ±50mm can be achieved; a horizontal adjustment of ±15mm can be achieved through the oblong hole of the lifting plate 82; and the angle adjustment of the lifting plate 82 and the lifting adjustment component 81 can accommodate ceiling tilt deviations. The combined effect of these three mechanisms achieves a total horizontal adjustment stroke of ±65mm and an angle adjustment range of ±10°, significantly reducing the accuracy requirements for ceiling drilling and eliminating the need for repeated measurements.

[0021] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A ceiling-mounted fresh air indoor unit that is easy to maintain, comprising a fresh air indoor unit body (1), two sets of lower mounting rails (2), a mounting assembly (3), two sets of upper mounting rails (4), a lower limit component (5), an upper limit component (6), a folding bracket (7), and a suspension assembly (8); The two sets of lower lifting rails (2) are arranged symmetrically in the front-to-back direction, and the two sets of upper lifting rails (4) are arranged parallel above the two sets of lower lifting rails (2); The hoisting assembly (3) is installed at both ends of the lower hoisting rail (2). The main body (1) of the fresh air indoor unit is hoisted below the lower hoisting rail (2) by the hoisting assembly (3), and the front and rear positions can be finely adjusted by the hoisting assembly (3). The lower limit component (5) is symmetrically installed on the top of the lower hanging rail (2), the upper limit component (6) is symmetrically installed on the bottom of the upper hanging rail (4), and the folding bracket (7) is installed between the lower limit component (5) and the upper limit component (6). By adjusting the position of the lower limit component (5), the upper limit component (6) is driven to slide synchronously to achieve fine adjustment of the left and right position of the main body (1) of the fresh air indoor unit; by extending and retracting the folding bracket (7), the vertical height of the main body (1) of the fresh air indoor unit is adjusted. The suspension components (8) are symmetrically installed on the top outer side of the upper suspension rail (4) to fix the upper suspension rail (4) to the ceiling, and can achieve fine adjustment of the installation position and angle adaptation; The main body (1) of the fresh air indoor unit is equipped with an openable maintenance door (13) on the front side wall, and three rectangular inspection ports (14) with removable covers are provided at the bottom, which facilitates targeted maintenance by staff from the bottom.

2. The ceiling-mounted fresh air indoor unit for easy maintenance as described in claim 1, characterized in that, The main body (1) of the fresh air indoor unit includes an indoor unit housing (11). The inner cavity of the indoor unit housing (11) is divided into a fan cavity, a heat exchange cavity, a filter cavity and an electrical circuit cavity by a partition. The side walls at both ends of the indoor unit housing (11) are fixed with symmetrical front and rear lifting ears (12). The lifting ears (12) are provided with installation slots. The three rectangular inspection ports (14) are respectively connected to the fan cavity, the heat exchange cavity and the electrical circuit cavity.

3. The ceiling-mounted fresh air indoor unit for easy maintenance as described in claim 2, characterized in that, The upper lifting rail (4) has the same structure as the lower lifting rail (2). The four sides of the lower lifting rail (2) and the upper lifting rail (4) are provided with a sliding groove structure, and the side walls at both ends of the lower lifting rail (2) and the upper lifting rail (4) are provided with multiple positioning holes (21).

4. The ceiling-mounted fresh air indoor unit for easy maintenance as described in claim 3, characterized in that, The hoisting assembly (3) includes an adjustable hoisting rail (31), a fixing plate (32), and an adjusting assembly (33); The vertical section of the adjustable hanging rail (31) is the same as that of the lower hanging rail (2), and multiple adjustable insertion holes (311) are evenly provided on the side wall; the fixing plate (32) is installed in the top cavity of the adjustable hanging rail (31), and the upper part is fixed to the lower hanging rail (2). The lower lifting rail (2), the adjusting lifting rail (31) and the fixing plate (32) are all provided with matching fixing holes (23). The fixing connection is achieved by passing long bolts (22) through the fixing holes (23). The adjusting component (33) is installed at the bottom of the adjusting lifting rail (31).

5. The ceiling-mounted fresh air indoor unit for easy maintenance as described in claim 4, characterized in that, The adjustment component (33) includes a U-shaped bracket (331). The inner side of the side plate of the U-shaped bracket (331) is provided with a limiting slider (332) that matches the side groove of the adjustment rail (31). The side wall of the U-shaped bracket (331) is provided with a locking component, which is used to lock and unlock the position of the adjustment component (33) on the adjustment rail (31). The bottom of the U-shaped bracket (331) is fixed with an L-shaped bracket (336), and a lifting screw (337) is vertically fixed inside the L-shaped bracket (336). Two clamping nuts (338) for clamping the lifting ear plate (12) are installed at the bottom of the lifting screw (337).

6. The ceiling-mounted fresh air indoor unit for easy maintenance as described in claim 5, characterized in that, The locking assembly includes an adjusting member (333), a limiting baffle (334), and a compression spring (335). The adjusting component (333) is composed of an insert rod and a handle. The insert rod of the adjusting component (333) passes through the limiting slider (332) and can be inserted into the adjusting socket (311). The limiting baffle (334) is sleeved and fixed on the outer wall of the insert rod of the adjusting component (333). The compression spring (335) is set between the limiting baffle (334) and the inner wall of the limiting slider (332). In the natural state, the compression spring (335) is in a compressed state, pushing the limiting baffle (334) to drive the insert rod of the adjusting component (333) to insert into the adjusting socket (311) to achieve position locking. When the position needs to be adjusted, the operator pulls the handle outward to overcome the elastic force of the compression spring (335) and pull the insert rod out of the adjusting socket (311) to release the lock.

7. The easily maintainable ceiling-mounted fresh air indoor unit as described in claim 6, characterized in that, The lower limit component (5) includes a limit sliding component (51). The structure of the limit sliding component (51) is consistent with that of the U-shaped bracket (331) with the limit slider (332), and it can slide along the groove of the lower lifting rail (2). The top of the limiting sliding member (51) is symmetrically welded with connecting ear plates (52), and double-headed bolts (53) are installed between the connecting ear plates (52), and the end of the folding bracket (7) is connected to the double-headed bolts (53); The side wall of the limiting sliding member (51) is provided with a positioning component (54). The structure of the positioning component (54) is the same as that of the locking component of the adjustment component (33). Its rod can be inserted into the positioning hole (21) to achieve locking. The upper limit member (6) has the same structure as the lower limit member (5), but without the positioning component (54).

8. The ceiling-mounted fresh air indoor unit for easy maintenance as described in claim 7, characterized in that, The folding bracket (7) includes two sets of connecting plates (71) and (72) arranged in an alternating manner. The ends of the connecting plates (71) and (72) are provided with mounting holes that are clearance-fitted with double-headed bolts (53). The middle of the connecting plates (71) and (72) is hinged by a support shaft (74). Reinforcing rods (73) are installed between the two ends of the two sets of connecting plates (71) and the two sets of connecting plates (72). The support shaft (74) and one of the reinforcing rods (73) are each welded with a U-shaped bracket (75). The U-shaped bracket (75) suspends an adjustment hook (76) with opposite thread directions. An adjustment bracket (77) is connected between the two adjustment hooks (76), and the end of the adjustment bracket (77) is threadedly connected to the adjustment hook (76).

9. The easily maintainable ceiling-mounted fresh air indoor unit as described in claim 8, characterized in that, The suspension assembly (8) includes a lifting adjustment component (81), a lifting plate (82), and countersunk bolts (83); The structure of the hoisting adjustment component (81) is the same as that of the limiting sliding component (51) with positioning component (54), and it can slide along the upper hoisting rail (4) groove and be locked by the positioning component (54). The lifting plate (82) is installed on the top of the lifting adjustment component (81) by countersunk bolts (83). The lifting plate (82) has a horizontal waist-shaped countersunk bolt hole, and the top of the lifting adjustment component (81) has an installation hole that matches the countersunk bolt (83). The lifting plate (82) and the lifting adjustment component (81) can be angled.

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