Thin box plate structure of frameless box body of air handling unit

Abstract

The utility model discloses a thin boxboard structure of a frameless box body of an air handling unit, which is characterized in that a boxboard is integrally formed by foaming after a composite section bar I, a composite section bar II, an inner lining board and an outer lining board are assembled, and the composite section bar I is formed by connecting an aluminum alloy section bar I and a PVC (polyvinyl chloride) heat insulation section bar in a mortise and tenon joint manner; the second composite profile is formed by connecting a second aluminum alloy profile and a PVC heat insulation profile in a mortise and tenon joint mode. Two first composite profiles are matched and combined to form right-angle connection between box plates, and two second composite profiles are matched and combined to form plane section connection between the box plates. When the box plates are connected in a right-angle mode, the convex tooth structure of one aluminum alloy profile I is inserted into the clamping groove of the other aluminum alloy profile I; and when the boxboard sections are connected, the two second composite profiles are symmetrically contacted and adhered through glue. According to the utility model, the phenomena of cold bridge and condensation are avoided, and the aluminum profile has the advantages of good heat insulation effect, high structural strength, strong sealing performance, few types of profiles, convenience in design and installation and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of the box body structure of an air handling unit, in particular to a frameless box body thin box board structure of an air handling unit.

Background Art

[0002] The box bodies of the central air-conditioning terminal product air handling units are mainly divided into two categories from the structural form: frame structure and frameless structure. The current thicknesses of the box boards mainly include several specifications such as 25mm, 30mm, and 50mm. The 25mm and 30mm thick box boards of the air handling unit box body have different application scenarios compared with the 50mm thick box board, and each has its own advantages. The characteristics and application scenarios of the 25mm and 30mm thick box boards of the air handling unit box body are as follows:

[0003] Cost-effectiveness: The thinner box board uses less material, so the cost is relatively low, which is suitable for projects with limited budgets or strict cost control.

[0004] Light weight: The thinner box board reduces the weight of the entire unit, making it easier to transport, install, and maintain, especially more beneficial for occasions that require hoisting.

[0005] Space occupation: It occupies less space and is suitable for occasions with limited installation space, such as ceiling-mounted installation or narrow machine rooms.

[0006] Applicable scenarios: Usually used in general commercial or civil buildings with low requirements for heat preservation performance, small environmental temperature differences, or no strict control of indoor temperature and humidity, such as offices, stores, etc.

[0007] The frame structure usually forms a box body frame by connecting border profiles through tees, and then fixes the insulation board on the frame with aluminum alloy pressing strips or screws to form a box body. The frameless structure usually uses aluminum alloy profiles and PVC heat insulation profiles to be interspersed and matched, integrally foamed after being assembled with the inner and outer lining boards of the box board, and then connected and assembled with bolts or screws to form a box body.

[0008] Because the insulation board and the box body frame of the frame structure are not an integral structure, installation gaps are likely to appear between the insulation board and the frame, resulting in defects such as high air leakage rate, local condensation and dew formation in the box body, box body corrosion, and energy waste. The box board of the frameless structure directly forms a box body by integrally foaming and assembling the box board, and multiple factors such as box board strength, cold bridge breaking performance, and sealing performance need to be considered simultaneously. Although most frameless structures have improved in terms of air leakage rate, there are still deficiencies in box board strength and cold bridge breaking. In addition, for the current box body structures of most frameless air handling units, designers mostly design according to at least 3 types of aluminum alloy profiles and PVC combinations, with too many types of profiles, which have a greater impact on the design efficiency, production efficiency, etc. of the unit.

Content of the Utility Model

[0009] The utility model provides a frameless box body thin box board structure for an air handling unit, which solves the technical problems existing in the installation process of the frameless box body thin box board of the existing air handling unit, such as insufficient strength, cold bridge, poor airtightness, and excessive types of profiles.

[0010] The frameless box body thin box board structure provided by the utility model, the box board includes a No. I composite profile, a No. II composite profile, an inner lining board and an outer lining board. The No. I composite profile and the No. II composite profile are both designed with a slot structure. The box board is integrally foamed after being assembled by the No. I composite profile, the No. II composite profile, the inner lining board and the outer lining board, and then the integrally foamed box board is assembled into a box body. The No. I composite profile is formed by tenon and mortise connection of a No. I aluminum alloy profile and a PVC heat insulation profile, and the No. II composite profile is formed by tenon and mortise connection of a No. II aluminum alloy profile and a PVC heat insulation profile;

[0011] The right-angle connection between box boards is formed by combining two No. I composite profiles, and the planar section connection of box boards is formed by combining two No. II composite profiles;

[0012] The upper left corner of the No. I aluminum alloy profile is provided with a convex tooth structure, and the bottom of the convex tooth structure is provided with a clamping groove;

[0013] The upper left corner of the PVC heat insulation profile is provided with a sharp-angle concave-convex surface;

[0014] Before the right-angle connection of the box board, a high-elastic sealing strip is attached to one of the sharp-angle concave-convex surfaces. When the box board is right-angle connected, the convex tooth structure of one of the No. I aluminum alloy profiles is inserted into the clamping groove of the other No. I aluminum alloy profile, and the sharp-angle concave-convex surfaces of the two PVC heat insulation profiles approach each other and squeeze and contact the high-elastic sealing strip;

[0015] When the box board sections are connected, the two No. II composite profiles are symmetrically contacted and adhered with glue.

[0016] Through the above technical solution, the box body box board is mainly composed of two kinds of aluminum alloy profiles, one kind of PVC heat insulation profile, and one kind of high-elastic sealing strip. Among them, the No. I aluminum alloy profile and the PVC heat insulation profile are nested together to form the No. I composite profile, and the high-elastic sealing strip is pasted on the sharp-corner concave-convex surface of the PVC heat insulation profile. The No. II aluminum alloy profile and the PVC heat insulation profile are nested together to form the No. II composite profile. At the right-angle connection of the box body, both box boards adopt the No. I composite profile. The concave-convex surface and the clamping groove surface on the profile are in contact to avoid single-point contact, ensuring sufficient connection contact between the two box boards. Moreover, after the two box boards are buckled, the concave-convex surface on the profile forms multi-faceted and multi-point support and limitation for the connection, greatly improving the connection strength. The No. II composite profile formed after the mortise-tenon connection between the No. II aluminum alloy profile and the PVC heat insulation profile has a relatively complete plane for adhesion use, ensuring the adhesion strength between the two No. II composite profiles. At the same time, the structures of the No. I aluminum alloy profile and the No. II aluminum alloy profile are formed by connecting multiple mutually perpendicular surfaces, with high profile strength and not easily deformed.

[0017] Preferably, a groove locking structure I is provided at the upper right corner of the No. I aluminum alloy profile, and a convex groove locking structure is provided at the bottom of the PVC heat insulation profile. When the No. I aluminum alloy profile and the PVC heat insulation profile are connected by mortise and tenon, the convex groove locking structure of the PVC heat insulation profile is inserted into the groove locking structure I of the No. I aluminum alloy profile.

[0018] A groove locking structure II is provided at the top of the No. II aluminum alloy profile. When the No. II aluminum alloy profile and the PVC heat insulation profile are connected by mortise and tenon, the convex groove locking structure of the PVC heat insulation profile is inserted into the groove locking structure II of the No. II aluminum alloy profile.

[0019] Preferably, after the No. I aluminum alloy profile and the PVC heat insulation profile are connected by mortise and tenon, and after the No. II aluminum alloy profile and the PVC heat insulation profile are connected by mortise and tenon, sealant is applied for fixation at the mortise-tenon connection.

[0020] Preferably, when two No. II composite profiles are in symmetric contact and adhesion, the two groups of PVC heat insulation profiles are also in symmetric contact and adhesion at the same time. At this time, the sharp-corner concave-convex surfaces of the two groups of PVC heat insulation profiles are connected into a groove, and sealant is filled in the groove for secondary sealant application and fixation.

[0021] Through the above technical solution, both the No. I composite profile and the No. II composite profile are formed by tenon-mortise connection of an aluminum alloy profile and a PVC heat-insulating profile. That is, the No. I aluminum alloy profile is tenon-mortise connected to the PVC heat-insulating profile, and the No. II aluminum alloy profile is tenon-mortise connected to the PVC heat-insulating profile. This method is convenient for processing on the one hand, and on the other hand, the PVC heat-insulating profile is located inside during the tenon-mortise connection of the No. I composite profile and the No. II composite profile, so that the heat-insulating property of the box board can be further enhanced through the PVC heat-insulating profile. The bonding and fixing of the aluminum alloy profile and the PVC heat-insulating profile are fixed with 502 glue, and the aluminum alloy profile and the PVC heat-insulating profile cannot be loosened after bonding. This can ensure the parallelism of the plane and the straightness of the right-angle surface after the box board is formed.

[0022] Preferably, an outer slot I is provided at the lower right corner of the No. I aluminum alloy profile, an inner slot is provided at the top of the PVC heat-insulating profile, an outer slot II is provided at the bottom of the No. II aluminum alloy profile, an outer lining board is inserted into the outer slot I and the outer slot II, and an inner lining board is inserted into the two groups of inner slots. A cavity is formed between the No. I composite profile, the No. II composite profile, the outer lining board, and the inner lining board, and polyurethane foam is filled in the cavity.

[0023] Through the above technical solution, the No. I composite profile tenon-mortise connected by the No. I aluminum alloy profile and the PVC heat-insulating profile, and the No. II composite profile tenon-mortise connected by the No. II aluminum alloy profile and the PVC heat-insulating profile are used as adaptable connectors. During use, only according to the size of the box body, select inner lining boards and outer lining boards of different sizes and install them into the inner slots and outer slots of the No. I composite profile and the No. II composite profile, and then fill polyurethane foam in the formed cavity, a customized box board with the required specifications can be formed, which is convenient for installation.

[0024] Preferably, the No. II aluminum alloy profile includes a No. II aluminum alloy concave profile and a No. II aluminum alloy convex profile. The No. II aluminum alloy concave profile is provided with a docking groove, and the No. II aluminum alloy convex profile is provided with a convex platform. When two No. II composite profiles are symmetrically in contact and adhered, the convex platform is inserted into the docking groove.

[0025] Through the above technical solution, when two No. II composite profiles are symmetrically in contact and adhered, the convex platform is inserted into the docking groove. This structure provides more connection surfaces for adhesion and also provides greater shear force for the segment connection section, improving the connection strength of the box board.

[0026] The beneficial effects of the present utility model:

[0027] 1. The box body box board is composed of two aluminum alloy profiles and one PVC heat-insulating profile, using fewer profiles, thereby improving the design efficiency and production efficiency of the unit.

[0028] 2. When the boxes are connected at right angles, they are in contact through the concave-convex surfaces and the clamping groove surfaces on the profiles, avoiding single-point contact, ensuring sufficient connection contact between the two box panels. After the two box panels are buckled, the concave-convex surfaces and the clamping groove surfaces on the profiles form multi-faceted support and limitation at the connection, greatly enhancing the connection strength.

[0029] 3. When the boxes are connected on a plane, the two No. II composite profiles are symmetrically in contact and adhered. The insertion of the convex platform into the docking groove provides more connection surfaces for adhesion and also provides greater shear force for the section connection section, improving the connection strength of the box panels.

[0030] 4. The aluminum alloy profile structure is formed by connecting multiple mutually perpendicular surfaces, with high profile strength and not easily deformed. The PVC heat-insulating profile provides sufficient heat-insulating thickness for the box, greatly enhancing the cold bridge-breaking performance of the box. High-elastic sealing strips are provided at the right-angle connection parts of the box panels, and the section connection parts are adhesively bonded and secondarily sealed with sealant to ensure the airtightness of the box at the right-angle connection parts and the section connection parts of the box panels.

[0031] 5. The utility model not only avoids the generation of cold bridge and condensation phenomena, but also has multiple advantages such as good heat-insulating effect, high structural strength, strong sealing performance, few types of profiles, convenient design and installation, beautiful appearance, and meeting the requirements of clean air conditioners.

Description of the Drawings

[0032] Attached Figure 1 is the sectional view of the installation structure of the utility model;

[0033] Attached Figure 2 is the schematic diagram of the assembly structure of the No. I composite profile of the utility model;

[0034] Attached Figure 3 is the schematic diagram of the structure of the No. I aluminum alloy profile of the utility model;

[0035] Attached Figure 4 is the schematic diagram of the structure of the PVC heat-insulating profile of the utility model;

[0036] Attached Figure 5 is the schematic diagram of the assembly structure of the No. II composite profile of the utility model;

[0037] Attached Figure 6 is the schematic diagram of the structure of the concave profile of the No. II aluminum alloy profile of the utility model;

[0038] Attached Figure 7 is the schematic diagram of the structure of the convex profile of the No. II aluminum alloy profile of the utility model;

[0039] Description of the reference numerals in the drawings:

[0040] 100. No. I aluminum alloy profile, 101. Outer clamping groove I, 102. Groove locking structure I, 103. Convex tooth structure, 104. Clamping groove;

[0041] 200. PVC heat insulation profile, 201. Inner card slot, 202. Convex groove locking structure, 203. Sharp corner concave-convex surface;

[0042] 300. No. II aluminum alloy profile, 301. Concave profile of No. II aluminum alloy profile, 302. Convex profile of No. II aluminum alloy profile, 303. Convex platform, 304. Docking groove, 305. Groove locking structure II, 306. Outer card slot II;

[0043] 500. Inner lining board; 600. Outer lining board; 700. High-elastic sealing strip; 800. Sealant.

Specific implementation manner

[0044] The following further describes the present utility model in detail in conjunction with the accompanying drawings and specific implementation manners.

[0045] Example 1

[0046] As Figure 1 shown, for the frameless box body thin box board structure of the air handling unit, the box board includes No. I composite profile, No. II composite profile, inner lining board 500 and outer lining board 600. Both the No. I composite profile and the No. II composite profile are designed with card slot structures. The box board is integrally foam-molded after being assembled by the No. I composite profile, the No. II composite profile, the inner lining board 500 and the outer lining board 600, and then the box body is assembled by the integrally foam-molded box board. The No. I composite profile is formed by mortise and tenon connection of No. I aluminum alloy profile 100 and PVC heat insulation profile 200, and the No. II composite profile is formed by mortise and tenon connection of No. II aluminum alloy profile 300 and PVC heat insulation profile 200. The integrally foam-molded structure of the box board, the mortise and tenon connection structure between No. I aluminum alloy profile 100 and PVC heat insulation profile 200, and the mortise and tenon connection structure between No. II aluminum alloy profile 300 and PVC heat insulation profile 200 improve the heat insulation performance, sealing performance, structural stability performance and cold bridge breaking performance of the box board.

[0047] As Figures 2 - 4 shown, a groove locking structure I 102 is provided at the upper right corner of the No. I aluminum alloy profile 100, and a convex groove locking structure 202 is provided at the bottom of the PVC heat insulation profile 200. When the No. I aluminum alloy profile 100 and the PVC heat insulation profile 200 are connected by mortise and tenon, the convex groove locking structure 202 of the PVC heat insulation profile 200 is inserted into the groove locking structure I 102 of the No. I aluminum alloy profile 100.

[0048] As Figures 5 - 7 shown, a groove locking structure II 305 is provided at the top of the No. II aluminum alloy profile 300. When the No. II aluminum alloy profile 300 and the PVC heat insulation profile 200 are connected by mortise and tenon, the convex groove locking structure 202 of the PVC heat insulation profile 200 is inserted into the groove locking structure II 305 of the No. II aluminum alloy profile 300.

[0049] In this embodiment, after the No. I aluminum alloy profile 100 and the PVC heat-insulating profile 200 are tenon-mortise connected, and after the No. II aluminum alloy profile 300 and the PVC heat-insulating profile 200 are tenon-mortise connected, sealant is applied for fixation at the tenon-mortise connection.

[0050] As Figure 1 shown, the right-angle connection between the box panels is formed by combining two No. I composite profiles, and the planar section connection of the box panels is formed by combining two No. II composite profiles.

[0051] As Figure 3 shown, a convex tooth structure 103 is provided at the upper left corner of the No. I aluminum alloy profile 100, and a clamping groove 104 is provided at the bottom of the convex tooth structure 103; as Figure 4 shown, a sharp-corner concave-convex surface 203 is provided at the upper left corner of the No. I PVC heat-insulating profile 200.

[0052] As Figures 1 - 2 shown, before the right-angle connection of the box panels, a high-elastic sealing strip 700 is attached to one of the sharp-corner concave-convex surfaces 203. When the box panels are right-angle connected, the convex tooth structure 103 of one of the No. I aluminum alloy profiles 100 is inserted into the clamping groove 104 of the other No. I aluminum alloy profile 100, and the sharp-corner concave-convex surfaces 203 of the two PVC heat-insulating profiles 200 approach each other and squeeze and contact the high-elastic sealing strip 700.

[0053] A closed cavity is provided in the middle of the No. I aluminum alloy profile 100, and a convex tooth structure 103 in the vertical direction is provided at the upper left corner of the cavity. The closed cavity ensures sufficient profile strength at the right-angle joint. The clamping groove 104 and the convex tooth structure 103 in the vertical direction play a role in supporting and mutually limiting the two box panels at the right-angle joint.

[0054] As Figure 5 shown, when the box panel sections are connected, the two No. II composite profiles are symmetrically in contact and adhered with glue. When the two No. II composite profiles are symmetrically in contact and adhered, the two groups of PVC heat-insulating profiles 200 are also symmetrically in contact and adhered at the same time. At this time, the sharp-corner concave-convex surfaces 203 of the two groups of PVC heat-insulating profiles 200 are connected into a groove, and sealant 800 is filled in the groove for secondary sealant application and fixation. Through the secondary sealing, the problem of air leakage at the section connection joint is eliminated.

[0055] In this embodiment, as Figures 6 - 7 shown, the No. II aluminum alloy profile 300 includes a No. II aluminum alloy concave profile 301 and a No. II aluminum alloy convex profile 302. The No. II aluminum alloy concave profile 301 is provided with a docking groove 304, and the No. II aluminum alloy convex profile 302 is provided with a convex platform 303. When the two No. II composite profiles are symmetrically in contact and adhered, the convex platform 303 is inserted into the docking groove 304.

[0056] As Figures 1 - 7As shown in the figure, an outer slot I 101 is provided at the lower right corner of the No. I aluminum alloy profile 100, an inner slot 201 is provided at the top of the PVC heat insulation profile 200, and an outer slot II 301 is provided at the lower left corner of the No. II aluminum alloy profile 300. An outer lining plate 600 is inserted into the outer slot I 101 and the outer slot II 306, and an inner lining plate 500 is inserted into the two groups of inner slots 201. A cavity is formed between the No. I composite profile, the No. II composite profile, the outer lining plate 600, and the inner lining plate 500, and polyurethane foam is filled in the cavity. In this embodiment, the thickness of the foamed and formed box board is 25 mm or 30 mm.

[0057] Formed by integral foaming, the inner lining plate 500 can be fixed in the inner slot 201, and the outer lining plate 600 can be fixed in the outer slot. This prevents the inner lining plate 500 and the outer lining plate 600 from loosening. In actual production, in order to further ensure the structural stability and sealing performance of the inner lining plate 500 and the outer lining plate 600, glue can be coated or back glue can be attached to the contact surfaces between the inner lining plate 500 and the inner slot 201, and between the outer lining plate 600 and the outer slot I 101 and the outer slot II 301.

[0058] During use, the No. I aluminum alloy profile 100 and the PVC heat insulation profile 200 are assembled into a No. I composite profile by mortise and tenon connection, and the No. II aluminum alloy profile 300 and the PVC heat insulation profile 200 are assembled into a No. II composite profile by mortise and tenon connection. After that, as Figure 1 shown, the inner and outer lining plates are inserted into the inner and outer slots of the No. I composite profile and the No. II composite profile, and then polyurethane can be filled into the formed cavity for foaming. After the polyurethane foams and solidifies, a half box board is formed.

[0059] After that, through segment connection, the two half box boards are symmetrically contacted and adhered. That is, as Figure 1 and Figure 5 shown, two of the No. II composite profiles are symmetrically contacted, and glue is applied at the contact surface before docking contact. Then, the boss 303 of one of the No. II composite profiles is inserted into the docking groove 304 of the other No. II composite profile. And it is clamped and stabilized for a period of time by using a fixture to ensure stable segment connection and adhesion. Then, sealant 800 is filled into the groove formed by connecting the two sharp-angle concave-convex surfaces 203 for secondary glue application and fixation. In order to ensure the appearance beauty of the box board, the sealant 800 protruding from the surface of the box board is scraped and leveled before the sealant 800 is completely solidified. After the sealant 800 solidifies, a box board is considered to be formed. Before the box boards are spliced, the sizes of the inner lining plate 500 and the outer lining plate 600 are determined according to the size of the box body.

[0060] When making a right-angle connection of the box body, first attach a highly elastic sealing strip 700 to the concave-convex surfaces 203 of the sharp corners on both sides of one of the box panels. Insert the convex tooth structure 103 on the No. I aluminum alloy profile 100 of one box panel into the clamping groove 104 on the No. I aluminum alloy profile 100 of the other box panel. The concave-convex surfaces 203 of the PVC heat-insulating profiles 200 on the two box panels approach each other and squeeze against the highly elastic sealing strip 700. To further ensure the angle during the right-angle connection of the box body, an installation fixture can be used for assistance. After the highly elastic sealing strip 700 is stably adhered, then take out the box panels with right-angle connection from the fixture.

[0061] Perform the segment connection and right-angle connection of the box panels according to the above method, and finally form a complete box body.

[0062] The above embodiments are only the implementation manners of the examples of the present utility model. For those skilled in the art, based on the disclosed application methods and principles of the present utility model, it is very easy to make various types of improvements or deformations, not limited to the structures or methods described in the above specific implementation manners of the present utility model. Therefore, the above-described manner is only a preferred solution and does not have a restrictive meaning. All equivalent changes and modifications made according to the present utility model are within the scope of protection of the claims of the present utility model.

Claims

1. A frameless box thin box panel structure for an air handling unit, the box panel comprising a No. I composite profile, a No. II composite profile, an inner lining plate (500) and an outer lining plate (600). The No. I composite profile and the No. II composite profile are both designed with a card slot structure. The box panel is integrally foamed after being assembled by the No. I composite profile, the No. II composite profile, the inner lining plate (500) and the outer lining plate (600), and then the integrally foamed box panels are assembled into a box body, characterized in that The No. I composite profile is formed by mortise-and-tenon connection of a No. I aluminum alloy profile (100) and a PVC heat-insulating profile (200), and the No. II composite profile is formed by mortise-and-tenon connection of a No. II aluminum alloy profile (300) and a PVC heat-insulating profile (200); The right-angle connection between the box panels is formed by combining two No. I composite profiles, and the planar section connection of the box panels is formed by combining two No. II composite profiles; A convex tooth structure (103) is provided at the upper left corner of the No. I aluminum alloy profile (100), and a clamping groove (104) is provided at the bottom of the convex tooth structure (103); A sharp-corner concave-convex surface (203) is provided at the upper left corner of the PVC heat-insulating profile (200); Before the right-angle connection of the box panels, a highly elastic sealing strip (700) is attached to one of the sharp-corner concave-convex surfaces (203). When the box panels are right-angle connected, the convex tooth structure (103) of one of the No. I aluminum alloy profiles (100) is inserted into the clamping groove (104) of the other No. I aluminum alloy profile (100), and the sharp-corner concave-convex surfaces (203) of the two PVC heat-insulating profiles (200) approach each other and squeeze and contact the highly elastic sealing strip (700); When connecting the box panel sections, the two No. II composite profiles are symmetrically contacted and adhered with glue.

2. The frameless box thin box panel structure of the air handling unit according to claim 1, characterized in that, A groove locking structure I (102) is provided at the upper right corner of the No. I aluminum alloy profile (100), and a convex groove locking structure (202) is provided at the bottom of the PVC heat-insulating profile (200). When the No. I aluminum alloy profile (100) and the PVC heat-insulating profile (200) are mortise-and-tenon connected, the convex groove locking structure (202) of the PVC heat-insulating profile (200) is inserted into the groove locking structure I (102) of the No. I aluminum alloy profile (100); A groove locking structure II (305) is provided at the top of the No. II aluminum alloy profile (300). When the No. II aluminum alloy profile (300) and the PVC heat-insulating profile (200) are mortise-and-tenon connected, the convex groove locking structure (202) of the PVC heat-insulating profile (200) is inserted into the groove locking structure II (305) of the No. II aluminum alloy profile (300).

3. The frameless box body thin box board structure of the air handling unit according to claim 2, characterized in that, After the No. I aluminum alloy profile (100) and the PVC heat-insulating profile (200) are mortise-and-tenon connected, and after the No. II aluminum alloy profile (300) and the PVC heat-insulating profile (200) are mortise-and-tenon connected, sealant is applied for fixation at the mortise-and-tenon joint.

4. The frameless box thin box panel structure of the air handling unit according to claim 3, characterized in that When the two No. II composite profiles are symmetrically contacted and adhered, the two groups of PVC heat-insulating profiles (200) are also symmetrically contacted and adhered at the same time. At this time, the sharp-corner concave-convex surfaces (203) of the two groups of PVC heat-insulating profiles (200) are connected into a groove, and sealant (800) is filled in the groove for secondary sealant application and fixation.

5. The frameless box body thin box board structure of the air handling unit according to claim 1, characterized in that, The lower right corner of the No. I aluminum alloy profile (100) is provided with an outer slot I (101), the top of the PVC heat insulation profile (200) is provided with an inner slot (201), the bottom of the No. II aluminum alloy profile (300) is provided with an outer slot II (306), an outer lining plate (600) is inserted into the outer slot I (101) and the outer slot II (306), and a lining plate (500) is inserted into the two groups of inner slots (201). A cavity is formed among the No. I composite profile, the No. II composite profile, the outer lining plate (600) and the lining plate (500), and polyurethane foam is filled in the cavity.

6. The frameless box body thin box board structure of the air handling unit according to claim 1, characterized in that, The No. II aluminum alloy profile (300) includes a No. II aluminum alloy concave profile (301) and a No. II aluminum alloy convex profile (302). The No. II aluminum alloy concave profile (301) is provided with a docking groove (304), and the No. II aluminum alloy convex profile (302) is provided with a convex platform (303). When two No. II composite profiles are symmetrically in contact and adhered, the convex platform (303) is inserted into the docking groove (304).

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