CN206709335U - A kind of airduct crossing pipes used in new exhaust ventilation system - Google Patents

Abstract

The utility model provides a kind of airduct crossing pipes used in new exhaust ventilation system, the crossing pipes can reduce the windage loss intersected in airduct to greatest extent, while also solve the problems, such as that the new exhaust ventilation system airduct of building intersects and take building vertical height space.

Description

An air duct cross fitting used in a new exhaust ventilation system

technical field

The utility model relates to an air duct intersecting pipe fitting, in particular to an air duct intersecting pipe fitting used in a new air exhaust and ventilation system, and belongs to the technical field of civil engineering heating and ventilation.

Background technique

In the building ventilation system, there is often the problem that the fresh air duct and the exhaust duct vertically intersect. The usual method is to arrange the fresh air duct and the exhaust duct vertically. Due to the relatively large size of the duct , The crossing of air ducts will occupy a large vertical height, and the method of increasing the floor height is usually adopted to ensure the clear height of the floor, which causes the height of each floor to be increased by at least 200mm, which greatly increases the cost of civil engineering.

Especially in some civil buildings such as high-rise offices and hotels, fresh air and exhaust air often use fresh air ventilators to recover exhaust energy. There are a large number of new exhaust ducts, and the intersection of the main duct and the branch ducts is serious. Usually, the U-shaped crossing of the branch ducts is used to avoid the main duct, resulting in an increase in the local resistance of the branch ducts, and the water and electricity in the corridor ceiling. Warm pipes are criss-crossed, take up a lot of space in the ceiling, and if the air pipes with large cross-sectional areas intersect in a large area, it is easy to cause the required ceiling height space, insufficient maintenance space for pipes and equipment in the ceiling, and insufficient room height. Condition.

Utility model content

In order to solve the problem that the crossing local resistance of the air pipes of the new exhaust and ventilation system of the building increases and the vertical space of the building is occupied, especially in places such as offices and hotel buildings where fresh air ventilators are used, the utility model provides a new The air duct cross fittings of the exhaust ventilation system, which can minimize the airflow loss in the cross ducts, and also solve the problem that the cross ventilation ducts of the new building exhaust ventilation system occupy the vertical height space of the building.

Technical problems that need to be solved in detail: first, the cross-sectional area of the main air duct will be insufficient if the branch air duct passes through the main air duct;

The main principle of the utility model is that the branch air duct with an elliptical cross-section passes through the main air duct in the horizontal direction without occupying the height of the vertical space; The airflow of the main air duct is smooth, reducing the loss of airflow resistance.

The air ducts in the prior art all adopt square air ducts or rectangular air ducts, and there is no technical solution for using branch air ducts to cross the main air duct to solve the story height in the existing building ventilation technology. The resistance of the air duct to the ventilation of the main air duct after crossing and the influence of the branch air duct on the ventilation cross-sectional area of the main air duct have caused no technical personnel in the current technology to realize that the crossing method is used to solve the air duct of the new exhaust ventilation system. The problem of the vertical height space occupied by the crossing is that the actual situation is that there is no technical solution to adopt the crossing method.

Compared with the straight plane or convex arc-shaped plane of the inner concave arc-shaped pipe expansion part of this patent, there is a local eddy current at the sharp corner of the inflection point of the latter, which will cause poor aerodynamic streamlines of the pipeline, especially the pipe expansion When the top is a convex arc-shaped plane, the local resistance coefficient is larger at the inflection point where the airflow enters, and the actual effect is not good; Air flow resistance, compared with commonly used square and round air ducts, due to the sharp corners of square air ducts, square and round air ducts will have relatively large flow resistance to the gas flowing through them, and square and round air ducts The shielding area of the pipe to the main air duct is larger, and the size of the expanded pipe required will also be increased. The use of elliptical ducts can effectively reduce the flow resistance and the shielding area of the airflow, reducing the size of the expansion duct.

The specific technical scheme is as follows:

An air duct cross pipe fitting used in a new exhaust and ventilation system, including a main air duct expansion pipe 1, a branch air pipe 2, reducing pipes 4-1 and 4-2, and air outlet flanges 5-1 and 5-2 , Air outlet flanges 6-1 and 6-2, the two ends of the main air duct expansion pipe 1 are respectively connected to the air outlet flanges 6-1, 6-2, and the air outlet flanges 6-1, 6-2 are used to connect the external main air duct , the two ends of the branch air pipe 2 are respectively connected to the reducing pipe 4-1, 4-2, and the other ends of the reducing pipe 4-1, 4-2 are respectively connected to the air outlet flange 5-1, 5-2, and the air outlet flange 5 -1 and 5-2 are respectively used to connect the external branch air pipes; it also includes a pipe expansion part 3-1, a pipe expansion joint part 3-3 and a pipe expansion part 3-2;

The side of the main air duct expansion 1 is sequentially connected by the expansion part 3-1, the expansion joint part 3-3 and the expansion part 3-2, and the branch air duct 2 vertically passes through the middle part of the expansion joint part 3-3 Intersect with the main air duct expansion tube 1 and pass through the other side of the main air duct expansion tube 1, and the expansion part 3-1 and the expansion part 3-2 are concave arc-shaped planes of equal size, and the concave The radian angle of the arc plane is between 30° and 45°;

Simultaneously, the cross-section of the branch air duct 2 is elliptical, and the major axis of the elliptical cross-section is parallel to the airflow direction of the main air duct expansion tube 1 channel, and its elliptical cross-sectional area is the same as that of the variable diameter pipe 4-1 or the variable diameter pipe 4- 2 The cross-sectional area of the external air duct at the other end is the same or slightly larger;

The ratio of the length of the major axis to the minor axis of the elliptical cross-section of the branch air duct 2 is between 3:1 and 6:1, and the two ends of the major axis along the direction of the major axis are 3-3 two meters away from the expansion joint. The shortest distance between the vertical sections of the ends is 100mm;

And the vertical distance between the two endpoints of the minor axis of the elliptical section and the nearest upper and lower surfaces of the main air duct expansion 1 is the vertical distance from the expansion junction 3-3 to the other side of the main air duct expansion 1. The distance to length ratio is not less than 1:50;

The expansion pipe 1 of the main air duct increases the cross-sectional area by means of arc expansion due to the area shielding caused by the crossing of the branch air duct 2, and the enlarged area is not smaller than the area to be shielded.

The air duct intersecting pipe fitting of the utility model can be applied to building ventilation systems, and is especially suitable for new building exhaust and ventilation systems in which the cross-sectional area of the main air duct is larger than that of the branch air ducts. The air duct cross fitting is used to connect the fresh air main air duct and the exhaust air branch duct, or to connect the exhaust air main air duct and the fresh air branch duct.

When the fresh air ventilation system is in operation, the fresh air introduced from the outside enters the main fresh air duct after heat exchange between the fresh air ventilator and the exhaust air. This pipe fitting is used at the intersection of the exhaust pipe and the exhaust main air pipe. The exhaust air main air pipe is connected to the pipe fitting 6-2, followed by 6-1 to the exhaust main air pipe, and the fresh air branch air pipe is connected to the pipe fitting 5-2, followed by 5-1 into the room;

Or, the exhaust air in the room is connected to the exhaust branch duct and then enters the exhaust main duct, and is discharged outside after the fresh air ventilator exchanges heat with the fresh air. Use this fitting at the intersection of the exhaust branch duct and the fresh air main duct The fresh air main air duct is connected with the pipe fitting 6-2, followed by 6-1 to connect the fresh air main air duct, and the exhaust branch air duct is connected with the pipe fitting 5-2, followed by 5-1 to enter the exhaust main air duct.

Preferably, the other side of the main air duct expansion tube 1 of the air duct cross fitting also adopts a concave arc-shaped plane expansion tube to further solve the problem of insufficient air passage area of the main air duct expansion tube 1 due to the occlusion of the branch air duct 2 .

Preferably, after the branch air duct 2 passes through the main air duct expansion tube 1, a rubber U-shaped groove belt is provided at the gap between the main air duct expansion duct 1 and the wall of the main air duct expansion duct 1 to prevent air leakage. Further, the width of the U-shaped card slot is 2cm.

Preferably, the sizes and/or shapes of the two ports of the reducing pipes 4-1 and 4-2 are adjustable, and are suitable for air ducts of new exhaust ventilation systems of different shapes.

Preferably, the branch air pipe 2 in the main air pipe expansion pipe 1 is made of aluminum and copper materials, which can enhance the heat exchange effect of fresh air and exhaust air. Compared with composite air ducts, it has the characteristics of high thermal conductivity and corrosion resistance.

The beneficial effect of the utility model is that: the branch air pipe 2 passes through the main air pipe to expand the pipe 1 in the horizontal direction, avoiding the vertical intersection of the air pipe and ensuring the storey height. At the same time, it also solves the problem of insufficient cross-sectional area of the main air pipe expansion pipe 1 caused by the branch air pipe 2 passing through the main air pipe expansion pipe 1, and the obstruction of the air flow of the main air pipe expansion pipe 1 caused by the branch air pipe 2 The technical problem of pipe expansion 1 local resistance increase is widely used in building ventilation systems, especially for new building exhaust and ventilation systems where the cross-sectional area of the main air pipe is larger than that of the branch air pipes.

Description of drawings

Below in conjunction with accompanying drawing and example the utility model is further described.

Fig. 1 is a perspective view of an air duct cross fitting used in a new exhaust ventilation system;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a schematic diagram along line A-A in Fig. 2;

Fig. 4 is a schematic diagram along the line B-B in Fig. 2;

Among them, main air pipe expansion 1, branch air pipe 2, expansion part 3-1 and 3-2, expansion joint part 3-3, reducing pipe 4-1 and 4-2, air outlet flange 5-1 And 5-2, tuyere flange 6-1 and 6-2.

Fig. 5 is a dimensioned perspective view of an air duct cross fitting used in a new exhaust ventilation system with dimensions marked in embodiment 1, wherein a is the length of the main air duct expansion tube 1 externally connected to the main air duct section; b The width of the section of the main air duct outside the main air duct expansion tube 1; c is the length of the section of the branch air duct 2 externally connected; d is the width of the section of the branch air duct externally connected to the branch air duct 2; e is the ellipse of the branch air duct 2 The length of the major axis of the section; f is the length of the minor axis of the elliptical section of the branch air duct 2; g is the length of the shortest distance between the two ends of the minor axis of the elliptical section of the branch air duct 2 and the upper and lower planes of the main air duct expansion tube 1; h is The relative plane of the pipe expansion joint 3-3 is along the side length of the airflow direction of the main air duct expansion pipe 1; i is the length of the side length of the pipe expansion joint 3-3 along the main air duct expansion pipe 1 airflow direction; The vertical distance from the pipe junction 3-3 to the other side of the main air duct 1.

detailed description

Example 1 An air duct cross fitting used in a new exhaust ventilation system. The size of the fitting is designed according to the actual application of the project, and it is verified through the application of specific HVAC projects. The relevant parameters and efficacy data are shown in Table 1. .

As shown in Figure 1-5, an air duct cross fitting used in a new exhaust and ventilation system, the cross-section of the external pipe of the main air pipe expansion pipe 1 and the external pipe of the branch air pipe 2 are rectangular, and the main air pipe Pipe expansion 1 is pipe expansion on one side, and the pipe expansion part is composed of pipe expansion parts 3-1 and 3-2, and pipe expansion joint part 3-3, and the other side is not expanded.

The pipe fittings in this embodiment include main air pipe expansion pipe 1, branch air pipe 2, reducing pipes 4-1 and 4-2, tuyere flanges 5-1 and 5-2, tuyere flanges 6-1 and 6- 2. The two ends of the main air pipe expansion pipe 1 are respectively connected to the air outlet flanges 6-1 and 6-2, and the air outlet flanges 6-1 and 6-2 are used to connect the external main air pipe, and the two ends of the branch air pipe Diameter pipes 4-1, 4-2, and the other ends of variable diameter pipes 4-1, 4-2 are respectively connected to tuyere flanges 5-1, 5-2, and tuyere flanges 5-1, 5-2 are respectively used for connecting An external branch air duct; it also includes a tube expansion part 3-1, a tube expansion joint part 3-3 and a tube expansion part 3-2, and the arc angle of the concave arc plane is 30°;

The side of the main air duct expansion 1 is sequentially connected by the expansion part 3-1, the expansion joint part 3-3 and the expansion part 3-2, and the branch air duct 2 vertically passes through the middle part of the expansion joint part 3-3 Intersect with the main air duct expansion pipe 1 and pass through the other side of the main air duct expansion pipe 1, and the pipe expansion part 3-1 and the pipe expansion part 3-2 are concave arc-shaped planes of equal size;

Simultaneously, the cross-section of the branch air duct 2 is elliptical, and the major axis of the elliptical cross-section is parallel to the airflow direction of the main air duct expansion tube 1 channel, and its elliptical cross-sectional area is the same as that of the variable diameter pipe 4-1 or the variable diameter pipe 4- 2 The cross-sectional area of the external air duct at the other end is equal or slightly larger;

The lengths of the major axis and the minor axis of the elliptical section of the branch air duct 2 are respectively 700mm and 120mm, and the shortest distances between the two ends of the major axis along the direction of the major axis and the vertical sections at the two ends of the expansion joint 3-3 are respectively 100mm;

And the vertical distance between the two endpoints of the minor axis of the elliptical section and the nearest upper and lower surfaces of the main air duct expansion tube 1 is 40 mm, and the expansion joint 3-3 is to the other side of the main air duct expansion tube 1 The vertical distance length is 1580mm;

The expansion pipe 1 of the main air duct increases the cross-sectional area by means of arc expansion due to the area shielding caused by the crossing of the branch air duct 2, and the enlarged area is not smaller than the area to be shielded.

The device is applied in the actual building HVAC project. It is installed in a 22-storey office building. The height of the suspended ceiling is 420mm. Therefore, the use of this air duct fitting can reduce the space used by the suspended ceiling, thereby reducing the building height by 4.84m, effectively saving the cost of civil construction. This unit was installed in a fresh air ventilation system with a rated air volume of 2000m ³ /h for testing. The tested main air duct expander 1 and its built-in oval branch pipe 2 were designed according to the size of this embodiment. The test results show that in the main air duct When the air volume of the air duct is 2000m ³ /h and the air volume of the branch air duct is 600m ³ /h, the air volume passing through the main air duct expansion pipe 1 and the oval branch pipe 2 remains unchanged. The total local resistance loss of the pipe and the branch air pipe is reduced by 30%, which effectively reduces the power of the fresh air ventilator, reduces energy loss, and is more energy-saving.

The design of the pipe fittings in this embodiment effectively reduces the resistance at the intersection of the pipes, so that the fresh air ventilator with lower power can be used to realize the function under the condition of achieving the same technical effect, especially suitable for the cross-sectional area of the main air pipe is larger than that of the branch air pipe Cross-sectional area of the building's new exhaust ventilation system.

Table 1 Embodiment 1 parameter and efficacy data.

Claims (6)

1. An air duct cross fitting used in a new exhaust and ventilation system, including main air duct expansion (1), branch air ducts (2), variable diameter pipes (4-1, 4-2), and air outlet method Flanges (5-1, 5-2), air outlet flanges (6-1, 6-2), the two ends of the main air duct expansion pipe (1) are respectively connected to the air outlet flanges (6-1, 6-2), the air outlet Flanges (6-1, 6-2) are used to connect external main air ducts, and the two ends of branch air ducts (2) are respectively connected to reducing pipes (4-1, 4-2), and reducing pipes (4-1, The other ends of 4-2) are respectively connected to the air outlet flanges (5-1, 5-2), and the air outlet flanges (5-1, 5-2) are respectively used to connect the external branch air pipes; It is characterized in that it also includes a pipe expansion part (3-1), a pipe expansion joint part (3-3) and a pipe expansion part (3-2); The side of the main air duct expansion (1) is sequentially connected by the expansion part (3-1), the expansion joint part (3-3) and the expansion part (3-2), and the branch air duct (2) passes through vertically The middle part of the over-expansion pipe junction (3-3) intersects with the main air duct expansion pipe (1) and passes through the other side of the main air duct expansion pipe (1), and the expansion part (3-1), the expansion pipe The pipe part (3-2) is a concave arc-shaped plane of equal size, and the arc angle of the concave arc-shaped plane is between 30° and 45°; At the same time, the section of the branch air duct (2) is elliptical, and the major axis of the elliptical section is parallel to the air flow direction of the main air duct expansion tube (1), and the elliptical cross-sectional area is the same as that of the reducer tube (4-1) Or the cross-sectional area of the external air duct at the other end of the reducing pipe (4-2) is the same or slightly larger; The ratio of the length of the major axis to the minor axis of the elliptical cross-section of the branch air duct (2) is between 3:1 and 6:1, and the two ends of the major axis along the direction of the major axis are respectively separated from the expansion tube junction (3 -3) The shortest distance between the vertical sections at both ends is 100mm; And the vertical distance between the two endpoints of the minor axis of the elliptical section to the nearest upper and lower surfaces of the main air duct expansion (1) and the expansion joint (3-3) to the main air duct expansion (1) ) the vertical distance to length ratio of the other side is not less than 1:50; The expansion of the main air duct (1) increases the cross-sectional area by means of arc expansion due to the area shielding caused by the crossing of the branch air ducts (2), and the increased area is not smaller than the area to be shielded. 2. An air duct intersection pipe fitting used in a new exhaust and ventilation system according to claim 1, characterized in that the other side of the main air duct expansion (1) adopts a concave arc-shaped plane expansion. 3. According to claim 1 or 2, a kind of air pipe intersection pipe fitting used in new exhaust ventilation system is characterized in that the size of the two ports of the reducing pipe (4-1, 4-2) is adjustable and/or Or the shape of the two ports is adjustable. 4. A kind of air duct intersection pipe fitting used in new exhaust and ventilation system according to claim 3, characterized in that the branch air pipe (2) in the main air pipe expansion pipe (1) adopts aluminum material, copper material make. 5. A kind of air duct intersection pipe fitting used in a new exhaust ventilation system according to claim 4, characterized in that the branch air duct (2) passes through the main air duct and expands (1) to connect with the main air duct. The pipe expansion pipe (1) is provided with a rubber U-shaped groove belt at the gap of the pipe wall. 6. An air duct intersection pipe fitting used in a new exhaust and ventilation system according to claim 5, characterized in that the width of the U-shaped slot is 2 cm.