A combined air unit frame connecting structure

Abstract

The application relates to a combined air unit frame connecting structure, which comprises a plurality of frame rods, reinforcing rods, corner connecting pieces for connecting the frame rods and intermediate connecting pieces for connecting the frame rods and the reinforcing rods; the corner connecting piece comprises a bearing base, a first plug connected to the bearing base and used for transversely connecting the frame rods and a second plug used for longitudinally connecting the frame rods; outward first convex structures are arranged on two mutually-perpendicular side walls of the second plug; the intermediate connecting piece comprises a connecting plate and a plug-in block arranged on the connecting plate, the connecting plate is fixed on the frame rod, and the plug-in block is used for plugging in the reinforcing rod; the plug-in block has at least one partially concave side wall. The modular connecting structure designed in the application has high assembly efficiency, light structure quality, high connecting rigidity and is suitable for application places with large air volume and high static pressure.

Description

Technical Field

[0001] This utility model relates to the field of air conditioner installation frames, and in particular to a combined air handling unit frame connection structure. Background Technology

[0002] In the field of HVAC equipment technology, modular air handling units (MLUs) are the core equipment of air handling systems. The stability of their frame structure and assembly efficiency directly affect the overall system's operating performance and installation and maintenance costs. MLUs typically require modular assembly according to different application scenarios to meet diverse air handling needs, and the frame connection method is one of the key factors determining the overall performance of the unit.

[0003] Traditional modular air handling unit frames are mostly connected by welding or bolts, which have significant limitations. Firstly, welding requires specialized technicians and is time-consuming, greatly reducing production and installation efficiency, especially in large units. Secondly, bolted connections often lack rigidity, making them prone to loosening due to vibration and pressure changes over time, affecting the unit's sealing and stability. Particularly in high-volume, high-static-pressure applications, traditional frame structures struggle to withstand the continuous pressure of airflow, leading to deformation and air leakage, reducing air handling efficiency and potentially increasing energy consumption and operating noise.

[0004] Furthermore, traditional frames suffer from poor sealing performance at connection surfaces and lack effective sealing designs, making them prone to air leakage and affecting the accuracy of air handling and energy consumption control. Although some structures attempt to employ sealing measures, the installation and replacement of seals are inconvenient and difficult to adapt to the sealing requirements under different operating conditions. Utility Model Content

[0005] The purpose of this application is to solve the problems of low assembly efficiency and insufficient structural stiffness of traditional frames.

[0006] This application provides a combined air unit frame connection structure, including a plurality of frame rods, reinforcing rods, corner connectors for connecting the frame rods, and intermediate connectors for connecting the frame rods and reinforcing rods;

[0007] The corner connector includes a support base, a first plug connected to the support base and used for horizontal connection of the frame rod, and a second plug used for vertical connection of the frame rod; the second plug is a hollow square structure, and each of the two mutually perpendicular side walls of the second plug is provided with an outward first protrusion structure.

[0008] The intermediate connector includes a connecting plate and a plug block disposed on the connecting plate. The connecting plate is fixed to the frame rod, and the plug block is used to plug into the reinforcing rod. The plug block has at least one partially concave sidewall.

[0009] More specifically, the inner surface of the second plug sidewall corresponding to the first protrusion structure is provided with an inwardly protruding second protrusion structure.

[0010] More specifically, the second plug has a second mounting hole on its side wall that penetrates the first protrusion structure and the second protrusion structure.

[0011] More specifically, the first plug is a square structure with three sidewalls, and at least one sidewall of the first plug is provided with a third mounting hole.

[0012] More specifically, a reinforcing block is provided at the location of the third mounting hole on the inner surface of the sidewall with the third mounting hole.

[0013] More specifically, the connecting plate portion protrudes from the side wall of the plug block.

[0014] More specifically, the plug block is provided with several weight-reducing cavities, and the weight-reducing cavities are provided with reinforcing ribs.

[0015] More specifically, the plug-in block includes a hollow first weight-reducing cavity and a hollow second weight-reducing cavity. The area of ​​the first weight-reducing cavity is larger than the area of ​​the second weight-reducing cavity. The first weight-reducing cavity is provided with a plurality of parallel reinforcing ribs, and the second weight-reducing cavity is provided with a reinforcing rib in the middle.

[0016] More specifically, the sidewall of the vertical portion of the reinforcing rib is recessed.

[0017] More specifically, the connecting plate is provided with several fourth mounting holes.

[0018] The beneficial effects of this application are:

[0019] The modular air handling unit frame connection structure designed in this application includes detachable orthogonal tee corner connectors and intermediate connectors, all formed by sheet metal stamping. The corner connectors adopt a three-dimensional orthogonal structure (mutually perpendicular X / Y / Z axes) and a raised structure; the intermediate connectors adopt a limiting angle structure and an embedded structure. All connection surfaces have pre-reserved sealing grooves, allowing for the replacement of sealing rings of appropriate materials as required, eliminating air leakage at the connection surfaces. The modular connection structure designed in this application features high assembly efficiency, lightweight structure, and high connection rigidity, making it suitable for applications with high air volume and high static pressure. Attached Figure Description

[0020] Figure 1 This is an exploded schematic diagram of the frame connection structure of the combined air unit in this application;

[0021] Figure 2 This is a view of the corner connector in this application from a certain angle;

[0022] Figure 3 This is another angle view of the corner connector in this application;

[0023] Figure 4 This is a view of the intermediate connector in this application from a certain angle;

[0024] Figure 5 This is another angle view of the intermediate connector in this application;

[0025] Figure 6 This is a top view of the intermediate connector in this application;

[0026] Figure 7 This is a schematic diagram of the reinforcing rod in this application;

[0027] Figure 8 This is a three-dimensional schematic diagram of the connection structure in this application.

[0028] In the diagram: 1. Corner connector; 2. Intermediate connector; 3. Reinforcing rod; 4. Frame rod; 12. Bearing base; 13. Second plug; 14. First plug; 19. Protruding structure; 20. Third mounting hole; 21. Fourth mounting hole; 22. Reinforcing rib; 23. First mounting hole; 24. Bending structure; 25. Connecting plate; 26. Second mounting hole; 31. Fifth mounting hole. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] This application relates to a modular connection structure for a combined air compressor unit frame, including several frame rods 4, reinforcing rods 3, corner connectors 1 for connecting the frame rods 4, and intermediate connectors 2 for connecting the frame rods 4 and the reinforcing rods 3. Figure 1 As shown, 12 frame rods 4, 8 corner connectors 1, 2 intermediate connectors 2, and 1 reinforcing rod 3 combine to form a square frame, which can be used to house a modular air handling unit. The dimensions of the corner connectors 1, intermediate connectors 2, reinforcing rod 3, and frame rods 4 can all be adjusted according to the size of the target modular air handling unit.

[0033] like Figure 2 and Figure 3 As shown, in some specific embodiments, the corner connector 1 includes a support base 12, a first plug 14 connected to the support base 12 and used for laterally connecting the frame rod 4, and a second plug 13 used for longitudinally connecting the frame rod 4. Specifically, the first plug 14 is a square structure with three sidewalls, and at least one sidewall is provided with a third mounting hole 20 for laterally fixing the frame rod 4. To solve the problem of insufficient strength of thin plate threaded connections, a reinforcing block is also provided on the inner surface of the sidewall with the third mounting hole 20. This reinforcing block can increase the thread bearing area and improve the overall connection rigidity.

[0034] The second plug 13 has a hollow square structure. Each of its two perpendicular sidewalls has an outward-facing first protrusion, and the inner surface of the corresponding sidewall has an inward-facing second protrusion. These two protrusions together form a protrusion structure 19. The protrusion structure 19 has no thickness or shape limitations and can be adjusted according to the actual situation of different frame rods 4. Its function is to enhance the interlocking of the connection interface while ensuring smooth insertion of the connector into the unit frame. A second mounting hole 26 is provided on the protrusion structure 19. In the hollow square structure, only the two outward-facing perpendicular sidewalls have the protrusion structure 19; the other two sidewalls are flat and do not have mounting holes.

[0035] The protruding structure 19 ensures a stable tight fit between the connector and the frame rod 4 after smooth insertion. This tight fit eliminates the assembly gap between the frame rod 4 and the corner connector 1, improves connection stiffness, reduces vibration displacement, homogenizes contact stress, and thus extends fatigue life. The two sides without the protruding structure 19 form a loose fit with the frame rod 4 with a certain gap. The loose fit area serves as a "guide surface," assisting the frame rod 4 in quickly achieving coarse positioning; the tight fit area allows for fine adjustment of the frame insertion, avoiding interference caused by assembly stress deformation. If the frame is in a vibration environment, the loose fit area can also prevent resonance transmission from affecting the frame's stability. In this application, to eliminate the directional limitations of the fasteners connecting the frame rod 4 during on-site installation and ensure that the fasteners are concentrated on the end face or side, the first plug 14 has a mounting hole on only one side, while the second plug 13 has mounting holes on both sides.

[0036] like Figures 4 to 6 As shown, the intermediate connector 2 designed in this application includes a connecting plate 25 and a plug-in block. The connecting plate 25 has a fourth mounting hole 21 for fixing to the side of the frame rod 4, and the plug-in block is used to plug in and fix the reinforcing rod 3. The plug-in block has at least one partially concave sidewall, on which a first mounting hole 23 for fixing the reinforcing rod 3 is provided, and the first mounting hole 23 corresponds to the fifth mounting hole 31 of the reinforcing rod 3. The partially concave sidewall can enhance the structural strength. During the sidewall bending process, the outer side of the sheet metal is under tension and the inner side is under compression. Plastic deformation will cause the material to work harden, thereby increasing the local strength of the bending area. The geometry formed by bending will also increase the structural rigidity by increasing the moment of inertia of the section. In some specific embodiments, the fourth mounting hole 21 can be a high-strength self-drilling screw, and the first mounting hole 23 can be a combination of a countersunk rivet nut and a high-strength large flat head bolt.

[0037] The intermediate connector 2 is assembled with the unit frame using an embedded structure, and its overall rigidity and load-bearing capacity are enhanced by a bending structure 24. The bending angle can be adjusted according to actual operating conditions, but considering structural integrity and material mechanical properties, an obtuse angle design is recommended to reduce stress concentration risk and prevent material cracking. For the hollow areas of the connector, considering the unit weight, most of the connector uses a hollow structure; however, to ensure strength, some areas can use a solid structure. The shape of the solid areas is not restricted, aiming to increase some load-bearing capacity.

[0038] To reduce weight and material costs, the connector is designed as a hollow structure with several reinforcing ribs 22. Reinforcing ribs 22 are placed in key stress areas of the connector to further enhance its structural stability and resistance to deformation through localized stiffness reinforcement. The thickness and spatial arrangement of the reinforcing ribs 22 can be dynamically optimized according to the load distribution. To balance stress transmission paths and optimize load distribution efficiency, a symmetrical topology is preferred, allowing the reinforcing ribs 22 on both sides to work together to bear the load and avoid localized stress concentration.

[0039] Specifically, the plug-in block can be divided into a hollow first weight-reducing cavity and a hollow second weight-reducing cavity, with the area of ​​the first weight-reducing cavity being larger than that of the second weight-reducing cavity. The first weight-reducing cavity contains several parallel reinforcing ribs 22, which are perpendicular to the partially concave sidewalls. The first weight-reducing cavity adopts an axisymmetric double-rib layout, achieving optimal stress distribution through bilateral synergistic load-bearing. The second weight-reducing cavity has one reinforcing rib in the middle, simplifying the structure to a single-rib central layout, ensuring foundation support performance while controlling material costs. The thickness of the reinforcing ribs can be gradient-designed, positively correlated with load-bearing requirements: thicker in high-stress areas and thinner in general support areas. The intermediate connector 2 and the reinforcing rod 3 can connect two mutually perpendicular frame rods 4 and are locked to the frame through limiting holes.

[0040] The intermediate connector 2 of this application adopts a composite structure design. The main structure is formed by bending and forming, combined with the hollow weight reduction area. The reinforcing ribs are set in the key stress parts to optimize the stress distribution. The limiting arc corner prevents the connector from moving forward and backward. At the same time, it integrates standardized pre-fitting holes and embedded slots to form a connector that has structural strength, lightweight characteristics and quick assembly function.

[0041] The embodiments of this utility model have been described in detail above, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A modular air compressor unit frame connection structure, characterized in that, It includes several frame rods (4), reinforcing rods (3), corner connectors (1) for connecting the frame rods (4), and intermediate connectors (2) for connecting the frame rods (4) and the reinforcing rods (3). The corner connector (1) includes a support base (12), a first plug (14) connected to the support base (12) and used for transverse connection of the frame rod (4), and a second plug (13) used for longitudinal connection of the frame rod (4); the second plug (13) is a hollow square structure, and each of the two mutually perpendicular side walls of the second plug (13) is provided with an outward first protrusion structure; The intermediate connector (2) includes a connecting plate (25) and a plug block disposed on the connecting plate (25). The connecting plate (25) is fixed on the frame rod (4). The plug block is used to plug into the reinforcing rod (3). The plug block has at least one partially concave sidewall.

2. The connection structure according to claim 1, characterized in that, The inner surface of the side wall of the second plug (13) corresponding to the first protrusion structure is provided with an inward second protrusion structure.

3. The connection structure according to claim 2, characterized in that, The second plug (13) has a second mounting hole (26) on its side wall that penetrates the first protrusion structure and the second protrusion structure.

4. The connection structure according to claim 1, characterized in that, The first plug (14) is a square structure with three side walls, and a third mounting hole (20) is provided on at least one side wall of the first plug (14).

5. The connection structure according to claim 4, characterized in that, The inner surface of the sidewall with the third mounting hole (20) has a reinforcing block at the location of the third mounting hole (20).

6. The connection structure according to claim 1, characterized in that, The connecting plate (25) protrudes from the side wall of the plug block.

7. The connection structure according to claim 1, characterized in that, The plug block is provided with several weight-reducing cavities, and the weight-reducing cavities are provided with reinforcing ribs (22).

8. The connection structure according to claim 7, characterized in that, The reinforcing rib (22) is provided with a recessed sidewall in the vertical portion.

9. The connection structure according to claim 1, characterized in that, The connecting plate is provided with a number of fourth mounting holes (21).

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