End gulp valve for negative pressure pneumatic ash conveying

Abstract

The utility model relates to the technical field of dust removers, in particular to an end gulp valve for negative-pressure pneumatic ash conveying, which comprises a companion flange, an air inlet cavity coated with a wear-resistant coating, an umbrella-shaped diaphragm and a self-operated adjusting mechanism, self-cleaning airflow is formed through the umbrella-shaped diaphragm, and dust accumulation is reduced; the interior of the air inlet cavity is coated with a tungsten carbide or ceramic wear-resisting layer, the anti-scouring performance is improved, the self-operated adjusting mechanism achieves vacuum degree self-matching air supply through a spring and an adjusting nut, external electrical control is not needed, and an end sealing flange cover is detachable so as to achieve rapid ash removal and maintenance. The device solves the problems that a traditional gulp valve is poor in sealing performance, fast in abrasion and tedious in maintenance, and has the advantages of being efficient, saving energy, long in service life and the like.

Description

Technical Field

[0001] This utility model relates to the field of dust collector technology, specifically to an end air supply valve for negative pressure pneumatic ash conveying. Background Technology

[0002] A dust collector is a highly efficient and energy-saving flue gas purification device. The dust generated during the dust removal process needs to be stored at designated locations through a conveying method.

[0003] As the core component of industrial solid waste treatment, the ash conveying system is equipped with an air supply valve at the conveying end during traditional negative pressure ash conveying. After the dust-laden airflow impacts the valve plate, dust is easily accumulated on the outside of the valve body, affecting the sealing performance and air intake efficiency. The valve plate and valve seat are subjected to high-speed dust-laden airflow for a long time, and the metal material is easily worn, leading to leakage. The dust accumulation inside the valve body is difficult to clean, requiring frequent shutdowns for maintenance.

[0004] In response to the aforementioned problems, this technical solution designs an end air supply valve for negative pressure pneumatic ash conveying. Utility Model Content

[0005] The purpose of this utility model is to provide an end air supply valve for negative pressure pneumatic ash conveying to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A negative pressure pneumatic ash conveying end air supply valve includes a mating flange connected to the ash conveying pipeline, an air inlet cavity with an internal wear-resistant coating, an air inlet flange set on the top of the air inlet cavity, a self-operated air inlet mechanism, and a detachable end sealing flange cover.

[0008] Specifically, the self-operated intake mechanism consists of a stud, a clamping nut, an umbrella-shaped diaphragm, a compression spring, and an adjusting nut that penetrates vertically through the intake chamber. The spring preload is changed by adjusting the nut to match the pipeline vacuum.

[0009] The mating flange is connected to the flange of the ash conveying pipeline to ensure the airtightness of the connection. At the same time, the wear-resistant layer inside the air intake chamber is made of tungsten carbide or ceramic, and its thickness is generally set to 0.5-1.2mm. It has an effective anti-dust erosion effect. The design of the wear-resistant coating can improve the service life of the air intake chamber.

[0010] Compared with the prior art, the beneficial effects of this utility model are: by forming a diffusion-type sealing interface through the flexible umbrella-shaped diaphragm under the action of airflow, local erosion and dust accumulation are reduced, and sealing reliability is improved;

[0011] The ability to resist high-speed dust erosion is improved by coating the air intake cavity with a tungsten carbide / ceramic composite coating.

[0012] By linking the spring with the adjusting nut, the compressor automatically opens and closes according to the vacuum level in the pipeline, reducing the energy consumption of the air compressor.

[0013] The removable end-sealed flange cover allows for quick cleaning of accumulated dust without disassembling the valve body, reducing maintenance time. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of an end air supply valve for negative pressure pneumatic ash conveying.

[0015] Figure 2 This is a side view of the end air supply valve for negative pressure pneumatic ash conveying.

[0016] The components include: 1. Matching flange; 2. Inlet chamber; 3. Upper inlet flange; 4. Stud; 5. Compression nut; 6. Diaphragm; 7. Spring; 8. Adjusting nut; and 9. End sealing flange cover. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] Please see Figures 1-2 A negative pressure pneumatic ash conveying end air supply valve includes a mating flange 1 connected to the ash conveying pipeline, an air inlet chamber 2 with an internal wear-resistant coating, an air inlet flange 3 set on the top of the air inlet chamber 2, a self-operated air inlet mechanism, and a detachable end sealing flange cover 9.

[0022] Specifically, the self-operated air intake mechanism consists of a stud 4 that vertically penetrates the air intake chamber 2, a clamping nut 5, an umbrella-shaped diaphragm 6, a compression spring 7, and an adjusting nut 8. The spring preload is changed by adjusting the nut 8 to match the pipeline vacuum.

[0023] The mating flange 1 is connected to the flange of the ash conveying pipeline to ensure the airtightness of the connection. Meanwhile, the wear-resistant layer inside the air inlet chamber 2 is made of tungsten carbide or ceramic, and its thickness is generally set to 0.5-1.2mm. It has an effective anti-dust erosion effect. The wear-resistant coating design can improve the service life of the air inlet chamber 2.

[0024] The umbrella-shaped diaphragm 6 is made of fluororubber or polyurethane, with a cone angle of 30°-45°. When closed, it forms an annular seal and generates a self-cleaning effect when airflow passes through. At the same time, its outer edge is provided with a 2-3mm flange, which forms an annular contact seal with the valve seat when closed.

[0025] The inner wall of the air intake chamber 2 is coated with a tungsten carbide or alumina ceramic wear-resistant coating with a thickness of 0.5-1.2mm and a surface roughness Ra≤0.8μm;

[0026] The compression spring 7 is made of 316L stainless steel, with a spring stiffness coefficient k=50-80N / mm, and the axial displacement adjustment accuracy of the adjusting nut 8 is ±0.5mm;

[0027] The end sealing flange cover 9 is connected by bolts, which facilitates quick cleaning of accumulated dust and maintenance. A 3mm polytetrafluoroethylene sealing gasket is set on the mating surface between the bolt and the air inlet chamber 2.

[0028] The air intake channel of the upper air intake flange 3 is a tapered flow channel with an inlet diameter D1 to an outlet diameter D2 ratio of 1.5:1. The inner wall of the flow channel is polished to Ra≤0.4μm.

[0029] The umbrella-shaped diaphragm 6 has annular reinforcing ribs on its back. The height of the ribs is 2-3 times the thickness of the diaphragm, and 6-8 ribs are evenly distributed radially.

[0030] In one embodiment of the present invention, one assembly process of the present technical solution is as follows: the mating flange 1 is welded to the end of the ash conveying pipeline to ensure that the flatness of the flange sealing surface is ≤0.05mm;

[0031] The inner wall of the air intake chamber 2 is coated with a tungsten carbide coating with a thickness of 0.8 mm and a hardness of HV≥1000 using a plasma spraying process, and then polished to achieve a surface roughness Ra≤0.8 μm.

[0032] The umbrella-shaped diaphragm 6 is made of fluororubber molding material with a 40° cone angle. It has 8 radial reinforcing ribs with a height of 3mm on the back and a 2mm flange on the outer edge of the diaphragm to enhance the sealing contact pressure.

[0033] Self-regulating mechanism installation: Insert the stud 4 vertically through the center of the air inlet chamber 2, and then insert the clamping nut 5 and the compression spring 7 in sequence (spring stiffness k=65N / mm). The top is locked by the adjusting nut 8. Each rotation of the adjusting nut 8 corresponds to a spring compression of 2mm, which can be adapted to -30kPa vacuum conditions.

[0034] The end sealing flange cover 9 is connected to the air intake chamber 2 by 10 sets of M10 bolts, and a 3mm thick polytetrafluoroethylene sealing gasket is provided on the mating surface to ensure the sealing performance after disassembly and reassembly.

[0035] The operation process of this utility model:

[0036] Air replenishment mode: When the negative pressure of the ash conveying pipeline reaches -25kPa, the external air pressure pushes the umbrella-shaped diaphragm 6 to overcome the spring force and open. The airflow forms a spiral flow along the cone surface of the diaphragm, which washes the sealing surface to prevent ash accumulation.

[0037] Closed mode: After the negative pressure drops to -10kPa, the spring 7 returns to its original position, causing the diaphragm 6 to fit tightly against the valve seat. The flanged structure increases the contact stress to 0.8MPa, ensuring zero leakage.

[0038] Maintenance procedure: After shutting down the ash conveying system, remove the bolts of the end sealing flange cover 9 and use a high-pressure air gun to clean the ash accumulated on the inner wall of the cavity. There is no need to remove other parts of the valve body.

[0039] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An end air supply valve for use in a negative pressure pneumatic ash conveying system, characterized by It includes a mating flange (1) connected to the ash conveying pipeline, an air inlet cavity (2) with an internal wear-resistant coating, an air inlet flange (3) set on the top of the cavity, a self-operated air inlet mechanism and a detachable end-sealing flange cover (9); the self-operated air inlet mechanism consists of a stud (4) that penetrates the cavity vertically, a clamping nut (5), an umbrella-shaped diaphragm (6), a compression spring (7) and an adjusting nut (8), and the spring preload is changed by adjusting the nut (8) to match the pipeline vacuum.

2. The end air supplementing valve for negative pressure pneumatic ash conveying according to claim 1, characterized in that, The umbrella-shaped diaphragm (6) is a flexible fluororubber or polyurethane component with a cone angle of 30°-45°. Its outer edge is provided with a 2-3mm flange, which forms an annular line contact seal with the valve seat when closed.

3. The end air supplementing valve for negative pressure pneumatic ash conveying according to claim 1, characterized in that, The inner wall of the air intake cavity (2) is coated with a tungsten carbide or alumina ceramic wear-resistant coating with a thickness of 0.5-1.2 mm and a surface roughness Ra≤0.8μm.

4. The end air supplementing valve for negative pressure pneumatic ash conveying according to claim 1, characterized in that, The compression spring (7) is made of 316L stainless steel and has a spring stiffness coefficient k = 50-80 N / mm.

5. The end air supplementing valve for negative pressure pneumatic ash conveying according to claim 1, characterized in that, The end sealing flange cover (9) is connected to the air inlet chamber (2) by 8-12 sets of M10 bolts, and a 3mm thick polytetrafluoroethylene sealing gasket is provided on the mating surface.

6. The end air supplementing valve for negative pressure pneumatic ash conveying according to claim 1, characterized in that, The air intake channel of the upper air intake flange (3) is a tapered flow channel with an inlet diameter D1 to an outlet diameter D2 ratio of 1.5:1 and the inner wall of the flow channel is polished to Ra≤0.4μm.

7. The end air supplementing valve for negative pressure pneumatic ash conveying according to claim 2, characterized in that, The umbrella-shaped diaphragm (6) has annular reinforcing ribs on its back. The height of the ribs is 2-3 times the thickness of the diaphragm, and 6-8 ribs are evenly distributed radially.

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