A static mixer

Abstract

The utility model belongs to the technical field of mixer, especially a static mixer, including by left to right connection's pressure -taking device, damper device and mixing device, the pressure -taking device includes pressure -taking shell and sets up in the venturi pipe of pressure -taking shell, the damper device includes damper shell, sets up in the damper of damper shell and the power device of drive damper rotation, the mixing device includes mixing shell, be equipped with annular air outlet pipe in the mixing shell, be equipped with gas air inlet pipe on the lateral wall of mixing shell and pass through, gas air inlet pipe outer end projects mixing shell, inner chamber and annular air outlet pipe inner chamber intercommunication, be equipped with a plurality of air outlet holes on the annular air outlet pipe, the pressure -taking shell, damper shell and mixing shell connect in proper order. The utility model need not fan to provide higher air pressure, and fan cost is low, and fan volume is small, and the torque that power device needs is small, and the price is low, and the kind is many, and is easy to purchase.

Description

Technical Field

[0001] This utility model belongs to the field of mixer technology, and specifically refers to a static mixer. Background Technology

[0002] Chinese invention patent (publication number CN110906333A, application date 2019.12.13, publication date 2020.03.24) discloses a mixer installed in a gas combustion system to mix air and gas to form a combustible mixture. The mixer includes: a venturi tube having an air inlet, a gas inlet, and a mixed gas outlet; the venturi tube having a central axis and a throat located along the central axis between the air inlet and the mixed gas outlet; the gas inlet being located at the throat; and an adjusting component disposed in the venturi tube and downstream of the throat, the adjusting component being drivable to move along the central axis toward or away from the throat, thereby changing the gas flow area within the venturi tube. The system also includes a drive mechanism for driving the regulating component. This drive mechanism comprises: a central shaft positioned within the venturi tube in a manner capable of reciprocating along the central axis, with the regulating component fitted and fixed to the central shaft; and a transmission assembly connected at one end to the central shaft and at the other end to an actuator, the transmission assembly causing the central shaft to move under the drive of the actuator. The regulating component is a conical valve plug whose conical outer surface facing the throat mates with the inner surface of the venturi tube at the throat. The regulating component is used within the mixer to adjust the flow rate according to the load. When the load decreases, the regulating component moves towards the airflow direction (towards the throat), reducing the flow area within the venturi tube and increasing the flow velocity. This maintains a relatively high flow velocity and flow resistance even at low flow rates / low loads, increasing the Reynolds number and enhancing turbulence, ensuring better mixing even at low flames in the combustion furnace.

[0003] The shortcomings of the above-mentioned mixer are: 1. The conical valve plug with large resistance requires the fan to provide high air pressure, resulting in high fan cost and large fan size; 2. The flow velocity at the constriction of the mixer is very high when the flame is low, and the actuator torque required to adjust the cross-sectional area of ​​the flow path is large, expensive, and there are few types, making it difficult to purchase. Utility Model Content

[0004] The purpose of this invention is to provide a static mixer that does not require a fan to provide high air pressure, has a low fan cost and small size; the power unit requires low torque, is inexpensive, comes in many types, and is easy to procure.

[0005] This utility model is implemented as follows: A static mixer includes a pressure tapping device, a damper device, and a mixing device connected sequentially from left to right. The pressure tapping device includes a pressure tapping housing and a venturi tube disposed within the pressure tapping housing. The damper device includes a damper housing, a damper disposed within the damper housing, and a power device for driving the damper to rotate. The mixing device includes a mixing housing with an annular air outlet pipe inside. A gas inlet pipe extends through the side wall of the mixing housing, with its outer end extending out of the mixing housing and its inner cavity communicating with the inner cavity of the annular air outlet pipe. The annular air outlet pipe has multiple air outlet holes. The pressure tapping housing, the damper housing, and the mixing housing are connected sequentially.

[0006] In the aforementioned static mixer, two or more annular air outlet pipes are coaxially arranged, the inner end of the gas inlet pipe is connected to the inner cavity of the outermost annular air outlet pipe, and the inner cavities of two adjacent annular air outlet pipes are connected through a transition pipe.

[0007] In the aforementioned static mixer, the inner cavities of two adjacent annular air outlet ducts are connected by two or more transition pipes, and the transition pipes are evenly distributed circumferentially.

[0008] In the aforementioned static mixer, the length of the annular air outlet duct decreases in a stepped manner from the outside to the inside, and the left end face of the annular air outlet duct gradually moves to the right from the outside to the inside.

[0009] In the aforementioned static mixer, the annular air outlet duct includes an inner ring plate and an outer ring plate. The left ends of the inner ring plate and the outer ring plate are connected by a left cover plate, and the right ends are connected by a right cover plate. The inner ring plate, the outer ring plate, the left cover plate, and the right cover plate form the inner cavity of the annular air outlet duct.

[0010] In the aforementioned static mixer, the inner ring plate and the outer ring plate are circular.

[0011] In the aforementioned static mixer, the inner ring plate and the outer ring plate are respectively provided with a plurality of air outlet holes.

[0012] In the aforementioned static mixer, the left cover plate has multiple air outlets evenly distributed around its circumference.

[0013] In the aforementioned static mixer, there are two or more dampers, and the rotation shafts of two adjacent dampers are connected by a connecting rod. The power unit is a motor installed outside the damper housing, and the motor shaft is connected to the rotation shaft of one of the dampers.

[0014] In the aforementioned static mixer, the end of the connecting rod of the damper rotation shaft is provided with a connecting rod, and the connecting rod is connected to the connecting rod.

[0015] In the aforementioned static mixer, the pressure tapping housing, damper housing, and mixing housing are all circular tubes, and each end is provided with a connecting flange. The pressure tapping housing, damper housing, and mixing housing are connected by connecting flanges.

[0016] The outstanding advantages of this utility model compared to the prior art are: 1. This utility model is equipped with a pressure tapping device, a damper device, and a mixing device. The gas is discharged through multiple air outlets of the annular air outlet pipe set in the mixing shell. The gas and air are mixed well. There is no need to set up a conical structure to increase resistance and increase flow rate. The system resistance is greatly reduced without affecting the mixing effect. That is, there is no need for a fan to provide high air pressure. The fan cost is low and the fan size is small. At the same time, because the air flow rate is slow, the power device that drives the damper to rotate requires less torque, is inexpensive, has many types, and is easy to purchase.

[0017] 2. This utility model has two or more annular air outlet pipes coaxially arranged. The inner end of the gas inlet pipe is connected to the inner cavity of the outermost annular air outlet pipe. The inner cavities of two adjacent annular air outlet pipes are connected through a transition pipe, resulting in a good mixing effect between gas and air. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of Embodiment 1 of this utility model.

[0019] Figure 2 This is a perspective view of the mixing device according to Embodiment 1 of this utility model.

[0020] Figure 3 This is a rear view of Embodiment 1 of this utility model.

[0021] Figure 4 This is a perspective view of the damper device according to Embodiment 2 of this utility model.

[0022] Reference numerals: 1. Pressure tapping housing; 2. Venturi tube; 3. Damper housing; 4. Damper; 5. Power unit; 6. Mixing housing; 7. Annular air outlet pipe; 7a. Inner ring plate; 7b. Outer ring plate; 7c. Left cover plate; 7d. Right cover plate; 8. Gas inlet pipe; 9. Air outlet; 10. Transition pipe; 11. Connecting rod; 12. Connecting rod. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —4: Example 1: See Figure 1-3 : A static mixer includes a pressure tapping device, an air damper device, and a mixing device connected sequentially from left to right. The pressure tapping device includes a pressure tapping housing 1 and a venturi tube 2 disposed within the pressure tapping housing 1. The air damper device includes an air damper housing 3, an air damper 4 disposed within the air damper housing 3, and a power device 5 for driving the air damper 4 to rotate. The mixing device includes a mixing housing 6, with an annular air outlet pipe 7 disposed within the mixing housing 6. A gas inlet pipe 8 is provided through the side wall of the mixing housing 6, with the outer end of the gas inlet pipe 8 extending out of the mixing housing 6 and its inner cavity communicating with the inner cavity of the annular air outlet pipe 7. The annular air outlet pipe 7 is provided with multiple air outlet holes 9. The pressure tapping housing 1, the air damper housing 3, and the mixing housing 6 are connected sequentially.

[0024] The working principle of this utility model is as follows: Figure 1-3 As shown, air enters through the left end of the pressure tapping housing 1, enters the damper housing 3, and after the air volume is adjusted by the damper 4, it enters the mixing housing 6, mixes with the gas entering through the gas inlet pipe 8, and then flows out from the right end of the mixing housing 6.

[0025] This utility model is equipped with a pressure tapping device, a damper device, and a mixing device. The gas is discharged through multiple air outlets of the annular air outlet pipe 7 set in the mixing shell 6. The gas and air are mixed well, and there is no need to set a conical structure to increase resistance and increase flow rate. The system resistance is greatly reduced without affecting the mixing effect, that is, there is no need for a fan to provide high air pressure. The fan cost is low and the fan size is small. At the same time, because the air flow rate is slow, the power device that drives the damper 4 to rotate requires less torque, is inexpensive, has many types, and is easy to purchase.

[0026] This utility model includes a pressure tapping device, an air damper device, and a mixing device. It is easy to install and maintain, and the installation method is more flexible. The position of each part can be adjusted as needed.

[0027] To ensure better mixing of gas and air, such as Figure 1 , 2 As shown, two or more annular air outlet pipes 7 are coaxially arranged. The inner end of the gas inlet pipe 8 is connected to the inner cavity of the outermost annular air outlet pipe 7, and the inner cavities of two adjacent annular air outlet pipes 7 are connected through a transition pipe 10. In this embodiment, three annular air outlet pipes 7 are coaxially arranged.

[0028] To ensure faster and more uniform gas flow, the inner cavities of two adjacent annular air outlet pipes 7 are connected by two or more transition pipes 10, which are evenly distributed circumferentially. In this embodiment, the inner cavities of two adjacent annular air outlet pipes 7 are connected by three transition pipes 10, which are evenly distributed circumferentially.

[0029] To better mix gas and air, such as Figure 1 , 2As shown, the length of the annular air outlet duct 7 decreases in a stepped manner from the outside to the inside, and the left end face of the annular air outlet duct 7 gradually moves to the right from the outside to the inside.

[0030] The structure of the annular air outlet duct 7 is as follows: Figure 1 , 2 As shown, the annular air outlet duct 7 includes an inner ring plate 7a and an outer ring plate 7b. The left ends of the inner ring plate 7a and the outer ring plate 7b are connected by a left cover plate 7c, and the right ends are connected by a right cover plate 7d. The inner ring plate 7a, the outer ring plate 7b, the left cover plate 7c, and the right cover plate 7d form the inner cavity of the annular air outlet duct 7. The structure is simple and easy to process and install.

[0031] Preferably, the inner ring plate 7a and the outer ring plate 7b are circular.

[0032] Furthermore, the inner ring plate 7a and the outer ring plate 7b are respectively provided with a plurality of air outlet holes 9.

[0033] To further improve the mixing effect of gas and air, multiple air outlets 9 are evenly distributed around the circumference of the left cover plate 7c. In this embodiment, there are six air outlets 9 evenly distributed around the circumference.

[0034] The installation structure of the power unit 5 and the damper 4 is as follows: Figure 1 , 3 As shown, there are two or more dampers 4, and the rotation shafts of two adjacent dampers 4 are connected by a connecting rod 11. The power device 5 is a motor installed outside the damper housing, and the rotation shaft of the motor is connected to the rotation shaft of one of the dampers 4.

[0035] Furthermore, the end of the connecting rod 11 of the rotating shaft of the damper 4 is provided with a connecting rod 12, and the connecting rod 11 is connected to the connecting rod 12.

[0036] In this embodiment, three dampers 4 are provided, and the motor shaft is connected to one end of the rotating shaft of the first damper 4 from top to bottom.

[0037] Furthermore, the pressure tapping housing 1, the damper housing 3, and the mixing housing 6 are all round tubes, and each end is provided with a connecting flange. The pressure tapping housing 1, the damper housing 3, and the mixing housing 6 are connected by connecting flanges.

[0038] Example 2: See Figure 4 : This embodiment is basically the same in structure as the first embodiment above, the main difference being that: there are two dampers 4.

[0039] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A static mixer, characterized in that: The device includes a pressure tapping device, a damper device, and a mixing device connected from left to right. The pressure tapping device includes a pressure tapping housing (1) and a venturi tube (2) disposed inside the pressure tapping housing (1). The damper device includes a damper housing (3), a damper (4) disposed inside the damper housing (3), and a power device (5) for driving the damper (4) to rotate. The mixing device includes a mixing housing (6). An annular air outlet pipe (7) is provided inside the mixing housing (6). A gas inlet pipe (8) is provided through the side wall of the mixing housing (6). The outer end of the gas inlet pipe (8) extends out of the mixing housing (6) and its inner cavity communicates with the inner cavity of the annular air outlet pipe (7). The annular air outlet pipe (7) is provided with multiple air outlet holes (9). The pressure tapping housing (1), the damper housing (3), and the mixing housing (6) are connected in sequence.

2. A static mixer according to claim 1, characterized in that: Two or more annular air outlet pipes (7) are coaxially arranged. The inner end of the gas inlet pipe (8) is connected to the inner cavity of the outermost annular air outlet pipe (7). The inner cavities of two adjacent annular air outlet pipes (7) are connected through a transition pipe (10).

3. A static mixer according to claim 2, characterized in that: The length of the annular air outlet pipe (7) decreases in a stepwise manner from the outside to the inside, and the left end face of the annular air outlet pipe (7) gradually moves to the right from the outside to the inside.

4. A static mixer according to claim 1, characterized in that: The annular air outlet pipe (7) includes an inner ring plate (7a) and an outer ring plate (7b). The left ends of the inner ring plate (7a) and the outer ring plate (7b) are connected by a left cover plate (7c) and the right ends are connected by a right cover plate (7d). The inner ring plate (7a), the outer ring plate (7b), the left cover plate (7c) and the right cover plate (7d) form the inner cavity of the annular air outlet pipe (7).

5. A static mixer according to claim 4, characterized in that: The inner ring plate (7a) and the outer ring plate (7b) are respectively provided with a plurality of air outlet holes (9).

6. A static mixer according to claim 5, characterized in that: The left cover plate (7c) has multiple air outlet holes (9) evenly distributed around its circumference.

7. A static mixer according to claim 1, characterized in that: There are two or more dampers (4), and the rotation shafts of two adjacent dampers (4) are connected by a connecting rod (11). The power device (5) is a motor installed outside the damper housing (3), and the motor shaft is connected to the rotation shaft of one of the dampers (4).

8. A static mixer according to claim 1, characterized in that: The pressure tapping shell (1), damper shell (3) and mixing shell (6) are all round tubes, and both ends are provided with connecting flanges. The pressure tapping shell (1), damper shell (3) and mixing shell (6) are connected by connecting flanges respectively.

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