Dilute-phase low-pressure pneumatic conveying mixing structure

Abstract

The utility model discloses a dilute-phase low-pressure pneumatic conveying mixing structure which comprises a mixing pipe, a first injection pipe and a second injection pipe, the mixing pipe is provided with a feeding port, an airflow inlet and an outlet, and the airflow inlet and the outlet are coaxially arranged; the first injection pipe is axially and adjustably mounted at the airflow inlet; the end part of the outer side of the first injection pipe is communicated to gas supply equipment, and the end part of the inner side of the first injection pipe is a reducing pipe positioned in the mixing pipe; the second injection pipe is mounted at the outlet, and the end part of the outer side of the second injection pipe is communicated to a material conveying pipeline; the pipe diameter D1 of the first injection pipe is the same as the pipe diameter D2 of the end part of the outer side of the second injection pipe, and the pipe diameter D3 of the end part of the inner side of the second injection pipe is smaller than the pipe diameter D2 of the end part of the outer side of the second injection pipe; the distance L between the adjacent ends of the first injection pipe and the second injection pipe is set to be 0.2 D1 to 1.5 D1. According to the utility model, the energy consumption can be reduced, the material accumulation in the mixing pipe is reduced, and the conveying efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic conveying systems, in particular to a dilute phase low-pressure pneumatic conveying mixing structure. Background Art

[0002] The dilute phase low-pressure pneumatic conveying system uses gas as the medium and air pressure as the power to transport powder and granular materials from A to B through pipelines. The materials to be transported need to be fed into the pipeline from the transportation location (silo or packaging bag). The mixing tube is a commonly used feeding mechanism with the advantages of simple structure and easy maintenance.

[0003] refer to Figure 1 As shown, the traditional mixing tube 1 includes a feeding port 11 at the top, an air flow inlet 12 on the left and an outlet 13 on the right. The outlet 13 is connected to the conveying pipeline, and the conveying direction is from left to right: the material enters the mixing tube 1 from the feeding port 11, and the conveying air flow enters the mixing tube 1 from the air flow inlet 12. After the material and the conveying air flow are mixed, they enter the conveying pipeline through the outlet 13.

[0004] The problems with traditional mixing tubes are:

[0005] (1) When the material just enters the mixing tube 1, the initial speed is very low, almost zero, and it needs to be accelerated by the conveying airflow to reach the speed required for pneumatic conveying. Different materials require different speeds. In order to achieve the corresponding speed, the air pressure and flow rate of the air source are usually increased, which increases the power of the system and the operating energy consumption;

[0006] (2) In the positive pressure conveying system, the feeding port 11 is usually connected to the atmosphere and has an atmospheric pressure, while the pressure in the conveying pipeline is a positive pressure, which is greater than the atmospheric pressure. There is an outward pressure difference between the feeding port 11 and the conveying pipeline, which makes it difficult for the feeding port 11 to drop into the mixing pipe 1. If the pressure difference is too large, it will also cause the airflow to leak outward, thereby causing dust to leak out.

[0007] (3) When the material at the feeding port 11 is not continuously discharged, the uneven and single-time over-feed of materials may cause the conveying airflow to be unable to blow away the accumulated materials, causing the pipeline to be blocked;

[0008] (4) When the material in the mixing tube 1 is accelerated, the probability of collision between the material and the inside of the mixing tube 1 will increase, thereby increasing the wear of the material and the mixing tube 1. Utility Model Content

[0009] The utility model aims to provide a dilute phase low-pressure pneumatic conveying mixing structure to solve the problems existing in the prior art, reduce energy consumption, reduce material accumulation in the mixing pipe, and improve conveying efficiency.

[0010] In order to achieve the above purpose, the solution of the utility model is:

[0011] A dilute phase low-pressure pneumatic conveying mixing structure comprises a mixing tube, a first injection tube and a second injection tube; the mixing tube is provided with a feeding port, an air flow inlet and an outlet, the air flow inlet and the outlet are coaxially arranged; the first injection tube is axially adjustably installed at the air flow inlet; the outer end of the first injection tube is connected to an air supply device, and the inner end thereof is a reducing tube located in the mixing tube; the second injection tube is installed at the outlet, and the outer end thereof is connected to a material conveying pipeline; the tube diameter D1 of the first injection tube is the same as the tube diameter D2 of the outer end of the second injection tube, and the tube diameter D3 of the inner end of the second injection tube is smaller than the tube diameter D2 of the outer end of the second injection tube; the spacing L between the adjacent ends of the first injection tube and the second injection tube is set to 0.2D1~1.5D1.

[0012] The diameter reduction angle α of the diameter reducing pipe is 5 to 15°, and the pipe diameter D4 of the diameter reducing pipe is 1 / 2 of the pipe diameter D1 of the first injection pipe.

[0013] A distance L between adjacent ends of the first spraying pipe and the second spraying pipe is set to D1.

[0014] The first injection pipe and the second injection pipe are both ceramic-lined pipes.

[0015] The inner end of the second spray pipe is provided with a rounded corner.

[0016] Preferably, the dilute phase low-pressure pneumatic conveying mixing structure also includes an adjustment steel pipe and a plurality of adjustment flanges arranged at the air flow inlet; the adjustment steel pipe includes a connecting pipe and a limiting ring, the connecting pipe is passed through the air flow inlet, and the first injection pipe is passed through the connecting pipe; the adjustment flange is sleeved on the connecting pipe, and its two ends respectively abut the limiting ring and the mixing pipe.

[0017] After adopting the above technical solution, the utility model has the following technical effects:

[0018] ① The reducing pipe of the first injection pipe reduces the cross-sectional area of ​​the airflow when it passes through, which can increase the velocity of the airflow while keeping the pressure and flow rate of the air supply equipment unchanged and the total power unchanged, thus playing an accelerating role;

[0019] ② The second injection pipe is an expanded diameter pipe, and D3<D2. Due to the Venturi effect, a pressure difference is generated between the opposite ends of the first injection pipe and the second injection pipe, so that a negative pressure area is generated between the two. The pressure in the negative pressure area is lower than the atmospheric pressure of the feeding port. The material entering from the feeding port is more likely to enter the second injection pipe under the action of negative pressure, and the conveying airflow is also difficult to leak from the feeding port;

[0020] ③ By adjusting the distance L between the adjacent ends of the first injection pipe and the second injection pipe, a suitable negative pressure and a better blowing effect can be generated. When the outlet of the first injection pipe is buried by material accumulation, it can be automatically blown open to avoid material accumulation and blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a mixing tube in the prior art;

[0022] Figure 2 It is a structural schematic diagram of a specific embodiment of the utility model;

[0023] Figure 3 It is an exploded view of a specific embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of the working principle of a specific embodiment of the utility model;

[0025] Description of Figure Numbers:

[0026] 1---mixing pipe; 11---feeding port; 12---air flow inlet; 13---outlet;

[0027] 2----the first injection pipe; 21---reduced diameter pipe;

[0028] 3----Second injection pipe; 31---rounded corners;

[0029] 4----Adjusting steel pipe; 41---Connecting pipe; 42---Limiting ring;

[0030] 5----Adjust the flange;

[0031] a----Negative pressure area. DETAILED DESCRIPTION

[0032] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention to be protected.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the embodiments of the present utility model, it should be understood that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use, or is the orientation or position relationship commonly understood by those skilled in the art. It is only to simplify the description for the convenience of describing the embodiments of the present utility model, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present utility model.

[0037] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0041] In addition, the present invention provides examples of various specific processes and materials, but a person skilled in the art may be aware of the application of other processes and / or the use of other materials.

[0042] refer to Figures 2 to 4 As shown, the utility model discloses a dilute phase low-pressure pneumatic conveying mixing structure, comprising a mixing pipe 1, a first injection pipe 2 and a second injection pipe 3;

[0043] The mixing tube 1 is provided with a feeding port 11, an air flow inlet 12 and an outlet 13, and the air flow inlet 12 and the outlet 13 are coaxially arranged;

[0044] The first injection pipe 2 is axially adjustable and installed at the air flow inlet 12, and the length of the first injection pipe 2 extending into the mixing pipe 1 can be flexibly adjusted; the outer end of the first injection pipe 2 is connected to the air supply device, and the inner end of the first injection pipe 2 is a reducing pipe 21 located in the mixing pipe 1;

[0045] The second injection pipe 3 is installed at the outlet 13, and its outer end is connected to the material conveying pipeline; the diameter D1 of the first injection pipe 2 is the same as the diameter D2 of the outer end of the second injection pipe 3, and the diameter D3 of the inner end of the second injection pipe 3 is smaller than the diameter D2 of the outer end of the second injection pipe 3;

[0046] The distance L between the adjacent ends of the first injection pipe 2 and the second injection pipe 3 (ie, the distance between the inner ends thereof) is set to 0.2D1 to 1.5D1.

[0047] Specific embodiments of the present utility model are shown below.

[0048] In order to reduce the pressure loss caused by the reduction in diameter, the diameter reduction angle α of the reduction pipe 21 is 5 to 15°, and the diameter D4 of the reduction pipe 21 is 1 / 2 of the diameter D1 of the first injection pipe 2, so that the air flow speed increases by about 4 times when passing through.

[0049] After experimental testing, the spacing L between the adjacent ends of the first injection pipe 2 and the second injection pipe 3 has a great influence on the effect of the utility model: when the value of L is too small, the negative pressure area generated moves forward, making it difficult to attract materials, and the outlet of the first injection pipe 2 is easily buried by material accumulation, and cannot be cleared by conveying airflow, resulting in blockage; and when the value of L is too large, the negative pressure generated is significantly reduced, and turbulence is easily generated around the outlet of the first injection pipe 2, affecting the entry of materials into the second injection pipe 3. After testing, when L = 0.2D1 ~ 1.5D1, the negative pressure is the largest, especially when L is close to D1, the blowing effect is the best, and when the outlet of the first injection pipe 2 is buried by material accumulation, it can be automatically blown open and cleared.

[0050] The first injection pipe 2 and the second injection pipe 3 are both ceramic-lined pipes, which can improve the wear resistance of both, reduce the wear caused by material impact, and extend the service life.

[0051] The inner end of the second injection pipe 3 (ie, the material inlet end) is provided with a rounded corner 31 for guiding the material into the second injection pipe 3 and reducing the impact force of the material on the end of the second injection pipe 3 .

[0052] The utility model also includes an adjustment steel pipe 4 and a plurality of adjustment flanges 5 arranged at the airflow inlet 12; the adjustment steel pipe 4 includes a connecting pipe 41 and a limiting ring 42, the connecting pipe 41 is passed through the airflow inlet 12, and the first injection pipe 2 is passed through the connecting pipe 41; the adjustment flange 5 is sleeved on the connecting pipe 41, and its two ends respectively abut against the limiting ring 42 and the mixing pipe 1. The thickness and number of the adjustment flanges 5 are set according to the insertion length of the first injection pipe 2 in the mixing pipe 1, and are used to control the spacing between the adjustment steel pipe 4 and the mixing pipe 1, thereby controlling the length of the first injection pipe 2 inserted into the mixing pipe 1, so as to meet the demand for adjusting the spacing L.

[0053] Through the above scheme, refer to Figure 4 As shown, the working principle of the utility model is:

[0054] The reducing tube 21 of the first injection tube 2 reduces the cross-sectional area of ​​the airflow when it passes through, and can increase the velocity of the airflow while keeping the pressure and flow rate of the air supply equipment unchanged and the total power unchanged, thereby playing an accelerating role; the second injection tube 3 is an expanding tube, and D3<D2. Due to the Venturi effect, a pressure difference is generated between the opposite ends of the first injection tube 2 and the second injection tube 3, so that a negative pressure area a is generated between the two (see Figure 4The dotted area in the negative pressure area a is lower than the atmospheric pressure of the feeding port 11. The material entering from the feeding port 11 is more likely to enter the second injection pipe 3 under the action of the negative pressure, and the conveying airflow is also difficult to leak from the feeding port 11. By adjusting the distance L between the adjacent ends of the first injection pipe 2 and the second injection pipe 3, a suitable negative pressure and a better blowing effect can be generated. When the outlet of the first injection pipe 2 is buried by material accumulation, it can be automatically blown open to avoid material accumulation and blockage.

[0055] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A dilute phase low-pressure pneumatic conveying mixing structure, characterized in that: It includes a mixing pipe, a first injection pipe and a second injection pipe; The mixing tube is provided with a feeding port, an air flow inlet and an outlet, and the air flow inlet is coaxially arranged with the outlet; The first injection pipe is axially adjustable and installed at the air flow inlet; the outer end of the first injection pipe is connected to the air supply device, and the inner end of the first injection pipe is a reduced diameter pipe located in the mixing pipe; The second injection pipe is installed at the outlet, and its outer end is connected to the material conveying pipeline; the diameter D1 of the first injection pipe is the same as the diameter D2 of the outer end of the second injection pipe, and the diameter D3 of the inner end of the second injection pipe is smaller than the diameter D2 of the outer end of the second injection pipe; The distance L between the adjacent ends of the first injection pipe and the second injection pipe is set to 0.2D1-1.5D1.

2. The dilute phase low-pressure pneumatic conveying mixing structure according to claim 1, characterized in that: The diameter reduction angle α of the diameter reducing pipe is 5 to 15°, and the pipe diameter D4 of the diameter reducing pipe is 1 / 2 of the pipe diameter D1 of the first injection pipe.

3. The dilute phase low-pressure pneumatic conveying mixing structure according to claim 1, characterized in that: A distance L between adjacent ends of the first spraying pipe and the second spraying pipe is set to D1.

4. The dilute phase low-pressure pneumatic conveying mixing structure according to claim 1, characterized in that: The first injection pipe and the second injection pipe are both ceramic-lined pipes.

5. The dilute phase low-pressure pneumatic conveying mixing structure according to claim 1, characterized in that: The inner end of the second spray pipe is provided with a rounded corner.

6. The dilute phase low pressure pneumatic conveying mixing structure according to any one of claims 1 to 5, characterized in that: It also includes an adjustment steel pipe and several adjustment flanges arranged at the air flow inlet; the adjustment steel pipe includes a connecting pipe and a limiting ring, the connecting pipe is passed through the air flow inlet, and the first injection pipe is passed through the connecting pipe; the adjustment flange is sleeved on the connecting pipe, and its two ends respectively abut the limiting ring and the mixing pipe.

Images