Flexible connection node of fan and air handling unit

Abstract

The flexible connection node of the fan and the air treatment equipment comprises an angle steel flange, a flexible short pipe and a pressing plate, a plurality of limiting rods are arranged at intervals between the outer side of the flexible short pipe and the two sides of the pressing plate, the limiting rod comprises a guide rod and a plug-in pipe, and the end of the guide rod is inserted into the plug-in pipe. The flexible connection node of the fan and the air treatment equipment can effectively solve the problem that the flexible short pipe is easy to produce radial distortion, and by controlling the width of the non-combustible material of the flexible short pipe and the setting of the limiting device, the length of the flexible short pipe can be strictly controlled within 150mm~250mm.

Description

Technical Field

[0001] This application relates to the field of ventilation and air conditioning construction technology, specifically to the flexible connection node between the fan and the air handling equipment. Background Technology

[0002] Flexible short pipes are typically installed at the connection points between the inlet / outlet of fans and air handling equipment and the ventilation ducts, primarily for vibration damping. The length of the flexible short pipe should be 150mm~250mm, and it should be installed flat and without twisting. If the flexible short pipe is too short, it will not provide vibration damping; if it is too long, it will cause significant deformation, affecting the airflow area. In actual engineering projects, due to the relatively low strength and stiffness of the flexible short pipe, it is difficult to control its deformation and expansion during operation of the fans and air handling equipment due to wind pressure, and radial twisting is prone to occur, significantly impacting its normal function. Utility Model Content

[0003] The purpose of this invention is to provide a flexible connection node between a fan and an air handling equipment, in order to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A flexible connection node between a fan and an air handling unit is characterized by comprising an angle steel flange, a flexible short pipe, and a pressure plate. Several limiting rods are provided at intervals between the outer side of the flexible short pipe and the two pressure plates on both sides. The limiting rods include guide rods and insertion pipes, and the end of the guide rod is inserted into the insertion pipe.

[0006] More preferably, the pressure plate has an L-shaped cross-section, and the limiting rod is located between the two angle steel flanges. One side plate of the L-shaped pressure plate presses and secures the edge of the flexible short pipe, while the other side plate extends between the two angle steel flanges and the interface flange.

[0007] Furthermore, the pressure plate includes a central rectangular plate and a folded edge on the surface of the central rectangular plate, and the central rectangular plate has square holes that are adapted to the shape of the two side interface flanges.

[0008] Furthermore, the edge of the flexible short pipe is inserted into the gap between the folded edge and the angle steel flange and fixed by rivets.

[0009] Furthermore, the angle steel flanges on both sides are aligned with the interface flanges of the fans and air handling equipment on both sides and then fixed with bolts.

[0010] Furthermore, the guide rod has a diameter of 10~12mm and is made of round steel, and the insertion pipe is a galvanized steel pipe.

[0011] Furthermore, the end of the guide rod that extends into the insertion tube is provided with an anti-detachment plate.

[0012] In addition, a spring is provided between the anti-detachment plate and the pressure plate.

[0013] More preferably, the pressure plate is made of galvanized steel sheet.

[0014] Compared with the prior art, this utility model has the following features and beneficial effects:

[0015] The flexible connection node between the fan and the air handling equipment in this application can effectively solve the problem of radial twisting of the flexible short pipe. By controlling the feeding width of the non-combustible material of the flexible short pipe and the setting of the limiting device, the length of the flexible short pipe can be strictly controlled within 150mm~250mm. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of embodiment 1 of the flexible connection node structure between the fan and the air handling equipment in this application;

[0017] Figure 2 This is a diagram illustrating the fixing of the flexible short tube involved in this application;

[0018] Figure 3 This is a diagram illustrating the pressure plate structure involved in this application;

[0019] Figure 4 This is a schematic diagram of embodiment 2 of the flexible connection node structure between the fan and the air handling equipment in this application;

[0020] Reference numerals: 1-Angle steel flange; 2-Flexible short pipe; 3-Pressure plate; 31-Central rectangular plate; 32-Folded edge; 4-Limiting rod; 41-Guide rod; 42-Plug-in pipe; 5-Rivet; 6-Bolt; 7-Interface flange. Detailed Implementation

[0021] To make the technical means, innovative features, objectives and effects of this utility model easier to understand, the utility model will be further described below.

[0022] The embodiments described herein are specific implementations of this utility model, used to illustrate the concept of this utility model. They are all illustrative and exemplary, and should not be construed as limiting the implementation methods or scope of this utility model. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0023] Example 1

[0024] Flexible connection nodes between fans and air handling equipment, such as Figures 1-3As shown, the device includes an angle steel flange 1, a flexible short pipe 2, and a pressure plate 3. Several limiting rods 4 are provided at intervals on the outer side of the flexible short pipe 2 and between the two pressure plates 3. Each limiting rod 4 includes a guide rod 41 and a plug pipe 42. The end of the guide rod 41 is inserted into the plug pipe 42. The pressure plate 3 includes a central rectangular plate 31 and a folded edge 32 on the surface of the central rectangular plate 31. The central rectangular plate 31 has round or square holes that match the opening shape of the two side interface flanges. The pipe edge of the flexible short pipe 2 is inserted into the gap between the folded edge 32 and the angle steel flange 1 and fixed by rivets 5. The folded edge serves to press the flexible short pipe onto the angle steel flange. The two side angle steel flanges 1 are aligned with the interface flanges 7 of the two side fans and air handling equipment and fixed by bolts 6.

[0025] The guide rod 41 has a diameter of 10~12mm and is made of round steel. The insertion tube 42 is a galvanized steel pipe. The end of the guide rod 41 that extends into the insertion tube 42 is provided with an anti-detachment plate. The diameter of the anti-detachment plate is smaller than the inner diameter of the galvanized steel pipe. A spring is also provided between the anti-detachment plate and the pressure plate 3. The pressure plate 3 is made of galvanized steel plate. The spring serves to return the guide rod 41 to its original position.

[0026] Example 2

[0027] Compared to Example 1, such as Figure 4 As shown, the cross-section of the pressure plate 3 is L-shaped, and the limiting rod 4 is located between the two angle steel flanges 1. One side plate of the L-shaped pressure plate 3 presses the side of the flexible short pipe 2, and the other side plate extends between the two angle steel flanges 1 and the interface flange 7 and is fixed by bolts. Compared with embodiment 1, this method uses a conventional setting method for the angle steel flange 1, which does not affect the air volume. The disadvantage is that, since the side plates of the angle steel flanges have the same width (small width), the variable range of the size of the limiting rod 4 is relatively small.

[0028] Example 3

[0029] Based on Embodiment 1, this application mainly considers installing limiting devices at the flanges at both ends of the flexible short pipe to limit the torsional deformation of the flexible short pipe, and strictly controlling the length of the flexible short pipe within the specified range through the limiting devices, so as to avoid the loss of vibration reduction effect or the impact on the air passage area of ​​the ventilation duct due to unreasonable length of the flexible short pipe.

[0030] The material for flexible short ducts should be corrosion-resistant, moisture-proof, airtight, and resistant to mold. When used in air conditioning systems, measures should be taken to prevent condensation, and the externally insulated duct should be covered with a moisture-proof layer. When used in smoke extraction systems, the flexible short ducts should be made of non-combustible materials, and their fire resistance should meet design requirements. For flexible short ducts fabricated on-site, the effective cross-section should be consistent with the interface dimensions of the upstream and downstream ducts, fans, or air handling equipment. When cutting the material, the long side should be the perimeter of the effective cross-section plus a 50mm overlap length, and the overlap should be sewn with fire-resistant thread; the short side should be 250mm plus the overlap length for anchoring with the angle steel flanges on both sides.

[0031] The specifications of the flexible short pipe riveted flange should be the same as the specifications of the flanges at the interfaces of the air ducts, fans, or air handling equipment on both sides. After the angle steel flange is welded, a limiting device should be installed at the flanges on both sides of the flexible short pipe. The limiting device consists of four DN15 galvanized steel pipes fixed to the angle steel flange on one side and four φ10 galvanized round steel bars fixed to the angle steel flange on the other side.

[0032] Galvanized short pipes and galvanized round steel are cut to 150mm lengths. After cutting, the burrs on the adjacent sides of the galvanized short pipe and galvanized round steel, which are to be fixed to the angle steel flanges, should be smoothed with an abrasive saw. The galvanized short pipes and galvanized round steel are welded to the corresponding corners of the angle steel flanges on both sides of the flexible short pipe. After welding, all weld slag is removed and anti-corrosion paint is applied. When welding the angle steel flange on one side of the galvanized round steel, the galvanized round steel should be inserted into the corresponding position of the galvanized short pipe on the other side of the angle steel flange, with the insertion depth controlled at 50mm. At this point, the length of the flexible short pipe in the middle of the two angle steel flanges is exactly 250mm. After the limiting device is connected, the completed flexible short pipe is anchored and fixed to the angle steel flanges on both sides.

[0033] When the internal air pressure of the flexible short pipe is negative or the flexible short pipe is set in a vertical position, as the flexible short pipe contracts and deforms, the galvanized round steel is gradually inserted into the galvanized steel pipe. After it is fully inserted, the galvanized round steel pushes against the angle steel flange on the other side. At this time, the length of the flexible short pipe is the shortest, which is consistent with the length of the limiting device, both being 150mm.

[0034] Example 4

[0035] Based on Example 3, after the flanged flexible short pipe is manufactured, it should be connected to the air duct and air handling equipment in a timely manner. During connection, attention should be paid to the orientation of the limiting device, and measures should be taken to reduce the axial displacement of the galvanized short pipe to avoid damage caused by friction between the galvanized short pipe and the flexible short pipe. On the air inlet side of the air handling equipment, where the air pressure is negative, the angle steel flange on the welded galvanized short pipe side should be close to the air handling equipment. During equipment operation, the negative pressure causes the flange on the round steel side to move closer to the steel pipe. On the air outlet side of the air handling equipment, where the air pressure is positive, the angle steel flange on the welded galvanized round steel side should be close to the air handling equipment. During equipment operation, the positive pressure causes the flange on the round steel side to move closer to the steel pipe. For air handling equipment with inlet and outlet located above the equipment, considering the compression of the flexible short pipe by the weight of the vertical ventilation duct, the angle steel flange on the welded galvanized steel pipe side should be located below. At this point, since the galvanized round steel of one side angle steel flange is inserted into the galvanized steel pipe of the other side angle steel flange, the radial twisting of the flexible short pipe can be effectively restricted; due to the compression deformation that is easily caused by wind pressure or the self-weight of the pipe, the minimum length of the flexible short pipe is also controlled to 150mm by the limiting device.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flexible connection node between a fan and an air handling unit, characterized in that: The system includes an angle steel flange (1), a flexible short pipe (2), and a pressure plate (3). Several limiting rods (4) are spaced apart on the outer side of the flexible short pipe (2) and between the two pressure plates (3) or the angle steel flange (1). Each limiting rod (4) includes a guide rod (41) and a insertion pipe (42). The end of the guide rod (41) is inserted into the insertion pipe (42). The pressure plate (3) has an L-shaped cross-section. The limiting rods (4) are located between the two angle steel flanges (1). One side plate of the plate presses the edge of the flexible short pipe (2) and the other side plate extends between the two angle steel flanges (1) and the interface flange (7); the pressure plate (3) includes a central rectangular plate (31) and a folded edge (32) on the surface of the central rectangular plate (31). The central rectangular plate (31) has square holes that are adapted to the shape of the two interface flanges; the edge of the flexible short pipe (2) is inserted into the gap between the folded edge (32) and the angle steel flange (1) and fixed by rivets (5).

2. The flexible connection node between the fan and the air handling equipment as described in claim 1, characterized in that: The angle steel flanges (1) on both sides are aligned with the interface flanges (7) of the fans and air handling equipment on both sides and then fixed with bolts (6).

3. The flexible connection node between the fan and the air handling equipment as described in claim 1, characterized in that: The guide rod (41) has a diameter of 10~12mm and is made of round steel, while the insertion pipe (42) is a galvanized steel pipe.

4. The flexible connection node between the fan and the air handling equipment as described in claim 3, characterized in that: The end of the guide rod (41) that extends into the insertion tube (42) is provided with an anti-detachment plate.

5. The flexible connection node between the fan and the air handling equipment as described in claim 4, characterized in that: A spring is also provided between the anti-detachment plate and the pressure plate (3).

6. The flexible connection node between the fan and the air handling equipment as described in any one of claims 1 to 5, characterized in that: The pressure plate (3) is made of galvanized steel plate.

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