A size-adjustable and recyclable duct device

Abstract

The utility model discloses a size adjustable and recycling's air pipe device relates to air power test equipment field, including two piece auxiliary air pipe wall, presents left and right parallel arrangement, as the left and right surface of air pipe device, and two piece auxiliary air pipe wall all are folded inwards, make two canvas layer opposite, auxiliary screw rod adjusting mechanism, is taut between two piece auxiliary air pipe wall, is used for adjusting the interval of two piece auxiliary air pipe wall, two piece main air pipe wall, presents up and down parallel arrangement, and is pressed between two piece auxiliary air pipe wall, as the upper and lower surface of air pipe device, main screw rod adjusting mechanism, is taut between two piece main air pipe wall, makes two piece main air pipe wall clamping two piece auxiliary air pipe wall, and static pressure ring is installed on every piece main air pipe wall and every piece auxiliary air pipe wall, is used for even pressure from air pipe device on. The utility model discloses can according to the air port size of air outlet equipment quick adjustment air pipe size, avoided the need to make special air pipe when testing unit every time, saves time and material.

Description

Technical Field

[0001] This utility model relates to the field of aerodynamic testing equipment, specifically to an adjustable and recyclable duct device. Background Technology

[0002] In product development and quality testing within the HVAC industry, the duct connection between the tested unit and the testing system directly affects the accuracy of the test data. Current industry standards (such as GB / T 1236-2017 "Performance Test of Industrial Fans") clearly require that the airtightness error of the connection points be less than 2%, but current mainstream connection solutions have significant defects.

[0003] 1. The core issue with using a metal flange structure is: (1) The air outlet size of the unit under test must be accurately matched. New models of units need to be re-molded for testing. (2) The laboratory needs to store dozens of flange specifications (a certain testing center's statistics show that it has 67 types of flanges in stock), which increases testing costs and affects testing efficiency; (3) The flange edge sealing strip showed signs of aging and leakage after 5 disassembly and reassembly.

[0004] 2. Although the corrugated pipe structure has a certain degree of flexibility, it still has the following problems: (1) The inner wall corrugation causes airflow turbulence (the measured pressure loss increases by 12-18%). (2) Insufficient radial strength; the cross-sectional deformation rate reaches 8.3% under static pressure tests above 2000 Pa. (3) Silicone rubber material undergoes plastic deformation after long-term use (dimensional stability decreases by 37% after 50 cycles).

[0005] In summary, existing duct connection devices have the following defects: 1. Insufficient adaptability: Traditional fixed-size air ducts cannot match the air outlets of different specifications of units, resulting in frequent customization and high costs; 2. Air tightness defects: Temporary flexible ducts are prone to air leakage, which affects the accuracy of testing and makes it difficult to meet the requirements of standards such as GB / T 1236-2017.

[0006] 3. Poor environmental performance: Existing solutions generate a large amount of disposable waste, which does not conform to the trend of green manufacturing.

[0007] With the implementation of the new version of the "Energy Efficiency Limits for Ventilation Units" in 2023, the test operating pressure range has been expanded to 50-3000Pa, and there is an urgent need for a new type of duct connection device that combines size adaptability, structural stability and circular economy. Utility Model Content

[0008] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an adjustable and reusable duct device that is suitable for airtight connection between the air outlet of the tested unit of different sizes and the standard test duct. It features adjustable size and reusability.

[0009] The objective of this invention is achieved through the following technical solution: This adjustable and reusable duct device comprises: Two secondary duct walls, each including a wide plate and several narrow plates symmetrically arranged on both sides of the wide plate, and the back of the wide plate and each narrow plate are connected and fixed by a canvas layer. The two secondary duct walls are arranged in parallel left and right, serving as the left and right surfaces of the duct device, and both secondary duct walls are folded inward so that their canvas layers face each other. The auxiliary screw adjustment mechanism is tightened between the two auxiliary air duct walls to adjust the distance between them. Two main air duct walls are arranged in parallel vertically and pressed between two secondary air duct walls, serving as the upper and lower surfaces of the air duct device. The main screw adjustment mechanism, tightened between the two main air duct walls, is used to adjust the distance between the two main air duct walls, so that the two main air duct walls clamp the two auxiliary air duct walls; and Static pressure rings are installed on each main duct wall and each secondary duct wall to uniformly draw pressure from the ductwork assembly.

[0010] As a further technical solution, main tensioning holes are opened at the four corners of the main air duct wall for installing the main screw adjustment mechanism.

[0011] As a further technical solution, a main mounting hole is opened in the center of the main air duct wall for installing a static pressure ring.

[0012] As a further technical solution, a secondary tensioning hole is opened on the wide plate of the secondary duct wall for installing a secondary screw adjustment mechanism.

[0013] As a further technical solution, secondary mounting holes are opened on the wide plate of the secondary duct wall for installing static pressure rings.

[0014] As a further technical solution, both the main screw adjusting mechanism and the auxiliary screw adjusting mechanism include a screw, nuts installed at both ends of the screw, and washers for mating with the nuts.

[0015] The beneficial effects of this utility model are as follows: 1. Both the main duct wall and the secondary duct wall are detachable structures, and the spacing can be adjusted using the corresponding main screw adjustment mechanism or secondary screw adjustment mechanism, so that the duct can be matched with the air outlet of different specifications of the unit, reducing the customization cost; 2. The secondary air duct wall is formed by bonding wide plates and several narrow plates to the canvas layer, so that there is no hard connection between the plates, only soft connection of the canvas. It can be folded inward in the vertical direction, but cannot be folded outward and will not leak air. 3. The canvas layer of the secondary air duct wall matches the main air duct wall to ensure airtightness under different sizes, with an air leakage rate of <1.5%; 4. The main duct wall is made of glass fiber reinforced polypropylene (PP-GF30), which reduces weight while ensuring structural strength (40% weight reduction compared to traditional metal ducts). Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the main air duct wall in this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the secondary air duct wall in this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the secondary air duct wall after folding in this utility model.

[0020] Figure 5 This is a schematic diagram of the static pressure ring in this utility model.

[0021] Figure 6 This is a schematic diagram of the main structure of this utility model.

[0022] Figure 7 This is a side view of the structure of this utility model.

[0023] Figure 8 This is a top view of the structure of this utility model.

[0024] Figure 9 This is a schematic diagram of the assembly of the secondary air duct wall in this utility model.

[0025] Figure 10 This is a schematic diagram of the assembly of the main air duct wall and the secondary air duct wall in this utility model.

[0026] Figure 11 This is a schematic diagram of the test unit in this utility model.

[0027] Explanation of reference numerals in the attached drawings: 1. Main duct wall; 11. Main mounting hole; 12. Main tensioning hole; 2. Secondary duct wall; 2. Canvas layer; 21. Wide plate; 22. Secondary mounting hole; 221. Secondary tensioning hole; 222. Narrow plate; 23. Static pressure ring; 3. Main screw adjustment mechanism; 4. Secondary screw adjustment mechanism; 5. Screw; 6. Nut; 7. Gasket; 8. Test unit; 9. Air outlet; 91. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings: Example: As attached Figures 1-11 As shown, this adjustable and recyclable duct device includes a main duct wall 1, a main mounting hole 11, a main tensioning hole 12, a secondary duct wall 2, a canvas layer 21, a wide plate 22, a secondary mounting hole 221, a secondary tensioning hole 222, a narrow plate 23, a static pressure ring 3, a main screw adjustment mechanism 4, a secondary screw adjustment mechanism 5, a screw 6, a nut 7, a gasket 8, a testing unit 9, and an air outlet 91.

[0029] Reference Appendix Figure 3 , 4 9. Each of the two secondary duct walls 2 includes a (long strip) wide plate 22 and several (long strip) narrow plates 23. The narrow plates 23 are symmetrically arranged on both sides of the wide plate 22. After the wide plate 22 and each narrow plate 23 are arranged into a rectangular panel, their backs are glued to the canvas layer 21 for connection and fixation. There is no rigid connection between the wide and narrow plates, only a flexible connection through the canvas layer 21. The panel assembled in this way can be folded inward in the vertical direction, but because there is an inner layer of canvas, the panel cannot be folded outward and will not leak air. The two secondary duct walls 2 are arranged parallel to each other, serving as the left and right surfaces of the duct device, and both secondary duct walls 2 are folded inward so that their canvas layers 21 are aligned. Furthermore, by tightening the secondary screw adjustment mechanism 5 between the two secondary duct walls 2, the spacing between the two secondary duct walls 2 can be adjusted according to different air outlet sizes.

[0030] like Figure 2 , 10 As shown, two main air duct walls 1 are arranged parallel to each other vertically and are pressed between two secondary air duct walls 2, serving as the upper and lower surfaces of the air duct device. The main screw adjusting mechanism 4 is tightened between the two main air duct walls 1, thereby adjusting the distance between the two main air duct walls 1, so that the two main air duct walls 1 clamp the two secondary air duct walls 2.

[0031] Furthermore, both the main screw adjusting mechanism 4 and the auxiliary screw adjusting mechanism 5 include a screw 6, nuts 7 installed at both ends of the screw 6, and washers 8 for mating with the nuts 7.

[0032] Main tensioning holes 12 are provided at each of the four corners of the main duct wall 1, through which screws 6 can pass, facilitating the installation of the main screw adjustment mechanism 4. At the same time, secondary tensioning holes 222 are provided on the wide plate 22 of the secondary duct wall 2, through which screws 6 can pass, facilitating the installation of the secondary screw adjustment mechanism 5.

[0033] like Figure 1 , 6As shown in Figures 7 and 8, the static pressure ring 3 is installed on each main duct wall 1 and each secondary duct wall 2, enabling uniform pressure extraction from the ductwork assembly. Preferably, a main mounting hole 11 is provided in the center of the main duct wall 1 to facilitate the installation of the static pressure ring 3. Simultaneously, a secondary mounting hole 221 is provided on the wide plate 22 of the secondary duct wall 2 to facilitate the installation of the static pressure ring 3.

[0034] Preferably, the main duct wall 1 is made of glass fiber reinforced polypropylene (PP-GF30), which reduces weight while ensuring structural strength. Actual usage tests have shown that the duct device provided by this invention exhibits excellent airtightness (leakage rate <1.5%) across different dimensions.

[0035] The working process of this utility model: Taking the installation of the indoor unit of an air-cooled direct expansion air conditioner as an example, first measure the size of the air outlet 91 of the test unit 9, then measure the required size on the secondary air duct wall 2, and fold the excess material (narrow material 23). Figure 9 As shown, the auxiliary screw adjustment mechanism 5 (screw 6) is then passed through the auxiliary tensioning hole 222 on the wide plate 22 and fixed with nut 7 and washer 8.

[0036] like Figure 10 As shown, the two folded auxiliary air duct walls 2 are placed between the two main air duct walls 1, and the main screw adjustment mechanism 4 (screw 6) is passed through the four main mounting holes 11 on the main air duct wall 1 and fixed with nuts 7 and washers 8.

[0037] like Figure 11 As shown, after the main and auxiliary air duct walls are fixed with screws 6 and nuts 7, they can be installed between the air outlet 91 of the test unit 9 and the wind tunnel equipment (not shown in the figure), thus completing the installation of the air duct. One end of the air duct device is connected to the air outlet 91, and the other end is connected to the wind tunnel equipment.

[0038] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this utility model should fall within the protection scope of the appended claims.

Claims

1. An adjustable-size and recyclable duct device, characterized in that, include: Two secondary air duct walls (2), each secondary air duct wall (2) includes a wide plate (22) and several narrow plates (23) symmetrically arranged on both sides of the wide plate (22). The backs of the wide plate (22) and each narrow plate (23) are connected and fixed by a canvas layer (21). The two secondary air duct walls (2) are arranged in parallel left and right, serving as the left and right surfaces of the air duct device. Both secondary air duct walls (2) are folded inward so that their canvas layers (21) face each other. The auxiliary screw adjustment mechanism (5) is tightened between the two auxiliary air duct walls (2) to adjust the distance between the two auxiliary air duct walls (2); Two main duct walls (1) are arranged in parallel, one above the other, and are pressed between two secondary duct walls (2) to serve as the upper and lower surfaces of the duct device. The main screw adjusting mechanism (4) is tightened between the two main air duct walls (1) to adjust the distance between the two main air duct walls (1), so that the two main air duct walls (1) clamp the two auxiliary air duct walls (2); and Static pressure rings (3) are installed on each main duct wall (1) and each secondary duct wall (2) to uniformly extract pressure from the ductwork.

2. The adjustable and recyclable duct device according to claim 1, characterized in that: The main air duct wall (1) has main tensioning holes (12) at each of its four corners for installing the main screw adjustment mechanism (4).

3. The adjustable and recyclable duct device according to claim 1, characterized in that: The main air duct wall (1) has a main mounting hole (11) at the center for installing a static pressure ring (3).

4. The adjustable and recyclable duct device according to claim 1, characterized in that: A secondary tensioning hole (222) is provided on the wide plate (22) of the secondary air duct wall (2) for installing the secondary screw adjustment mechanism (5).

5. The adjustable and recyclable duct device according to claim 1, characterized in that: A secondary mounting hole (221) is provided on the wide plate (22) of the secondary duct wall (2) for installing a static pressure ring (3).

6. The adjustable and recyclable duct device according to claim 1, characterized in that: Both the main screw adjustment mechanism (4) and the auxiliary screw adjustment mechanism (5) include a screw (6), nuts (7) installed at both ends of the screw (6), and washers (8) for mating with the nuts (7).

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