Self-cleaning injection pipeline filter

Abstract

The utility model discloses a self-cleaning injection pipeline filter, which relates to the technical field of filters, solves the problem that a filter screen of the filter cannot be cleaned on line, and comprises a filter body, a filter cavity is arranged in the filter body, a rotating shaft is arranged in the filter cavity, the upper end of the rotating shaft is rotatably connected with a cover plate, and the lower end of the rotating shaft is fixedly connected with the cover plate. A plurality of filter screens are evenly distributed on the outer side face of the rotating shaft in the circumferential direction and extend in the axial direction of the rotating shaft, gaps are formed between the filter screens and the inner wall of the filter body, channels between the inlets are blocked by at least two filter screens, and an air blowing mechanism is arranged on the rotating shaft. The filter screen has the advantages of being simple in structure, high in practicability and the like, the position of the filter screen is switched by rotating the rotating shaft, other filter screens which do not work yet are switched, high-pressure air can be blown to the filter screen through the air blowing mechanism, impurities can be blown away, and mesh holes of the filter screen are prevented from being blocked.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a self-cleaning spray pipeline filter. Background Art

[0002] The coal injection system is a device used to inject pulverized coal into combustion equipment. It usually consists of a pulverized coal bin, a pulverized coal conveying system, a coal injector, and a control system, etc. The working principle of the coal injection system is to convey pulverized coal from the pulverized coal bin to the coal injector through the pulverized coal conveying system, and then inject the pulverized coal into the combustion equipment through the nozzle.

[0003] During the coal injection process, it is necessary to filter the pulverized coal through a filter to remove the large particles mixed in the pulverized coal and make the pulverized coal burn more fully. In the prior art, two branch pipes are connected to the main pipeline of coal injection transportation, and the other ends of the two branch pipes are connected to a main pipeline. A filter is installed on each branch pipe, and a switching valve is installed on the front and rear sides of each filter. During operation, the switching valve on one of the branch pipes is closed, and the filter screen is not in the working state. The switching valve on the other branch pipe is in the open state, and the filter on this branch pipe is in the working state. Since only one layer of filter screen is provided inside the filter, after a long time of use, it is necessary to clean the filter screen to prevent it from being blocked. At the same time, the filter screen area is small and the filtering efficiency is not high. Therefore, at this time, it is necessary to close the switching valve on this branch pipe and switch to the filter on the other branch pipe to manually clean the filter screen. The above design has the following problems: First, due to a certain angle between the two branch pipes and the main pipeline, there will be a certain resistance during coal injection transportation, reducing the coal injection flow rate. Second, the filter screen inside the filter cannot be cleaned online, and it is necessary to cooperate with the two branch pipes to switch back and forth to manually clean the filter screen, which is cumbersome and troublesome. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the above problems and design a self-cleaning spray pipeline filter, which solves the problem that the filter screen of the filter cannot be cleaned online.

[0005] To achieve the above purpose, the technical solution of the utility model is that a self-cleaning spray pipeline filter is used for installing on the spray pipeline of pulverized coal, including a filter body. The inside of the filter body has a filtering cavity. The outer side of the filter body has an inlet and an outlet communicated with the filtering cavity. The top and bottom of the filter body are respectively provided with an installation port and a discharge port, and a cover plate and a bottom plate are respectively installed at the installation port and the discharge port.

[0006] A rotating shaft is arranged in the filtering cavity. The upper end of the rotating shaft is rotatably connected to the cover plate. A plurality of filter meshes are evenly distributed along the circumferential direction on the outer side surface of the rotating shaft. The filter meshes extend along the axial direction of the rotating shaft. There is a gap between the filter meshes and the inner wall of the filter body. At least two filter meshes block the channel between the inlets. A blowing mechanism is arranged on the rotating shaft, and the blowing direction of the blowing mechanism is tangent to the mesh surface of the filter mesh.

[0007] Preferably, the filter mesh is a single-piece filter mesh, and the filter mesh extends radially outward along the rotating shaft.

[0008] Preferably, the filter mesh is a columnar polygon structure composed of multiple filter meshes, and the columnar polygon structure extends along the axial direction of the rotating shaft.

[0009] Preferably, the filter mesh is a hexagonal columnar structure composed of six filter meshes. The middle part of the rotating shaft is a regular hexagon structure, and one of the six filter meshes is fixed on the outer side surface of the rotating shaft.

[0010] Preferably, the blowing mechanism is a purging plate. An air passage is formed inside the purging plate. The air passage is connected to an external air source. A plurality of air holes communicating with the air passage are formed on the bottom surface of the purging plate.

[0011] Preferably, an air passage is formed inside the rotating shaft. A plurality of air holes communicating with the air passage are arranged on the outer side surface of the rotating shaft. The air passage is connected to an external air source. The air passage and the plurality of air holes together form the blowing mechanism.

[0012] Preferably, a feed pipe and a discharge pipe are respectively arranged at the inlets and outlets. Flanges are installed on the feed pipe and the discharge pipe.

[0013] Preferably, a handle is installed at the upper end of the rotating shaft.

[0014] Compared with the prior art, its beneficial effects are as follows:

[0015] The utility model has the advantages of simple structure and strong practicability. A rotating shaft is installed inside the filter, and a plurality of filter meshes are installed circumferentially on the rotating shaft, which can increase the area of the sieve mesh. At the same time, a blowing mechanism is arranged on the rotating shaft to blow out the blockages on the filter mesh. Pulverized coal enters the interior of the filter from the inlet and is filtered by a certain filter mesh. When the filter mesh needs to be cleaned, only rotate the rotating shaft to switch the position of the filter mesh to another filter mesh that has not been in operation yet. Such a design has several advantages. One is to increase the area of the filter mesh and improve the filtration efficiency. The other is that the blowing mechanism can blow high-pressure air on the filter mesh to blow out the sundries and prevent the mesh holes of the filter mesh from being blocked. In this way, only one filter needs to be installed on the main pipeline to realize the on-line cleaning of the filter mesh, and there is no need to switch between two filters back and forth. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the filter in Embodiment 1;

[0017] Figure 2 is a schematic diagram of the structure of the filter in Embodiment 1 when the filter body is removed;

[0018] Figure 3 is a schematic diagram of the structure of the rotating shaft and the filter mesh inside the filter in Embodiment 1;

[0019] Figure 4 is a schematic diagram of the structure of the purging plate inside the filter in Embodiment 1;

[0020] Figure 5 is a schematic diagram of the structure of the rotating shaft and the filter mesh inside the filter in Embodiment 2;

[0021] Figure 6 is Figure 5 the top view structure diagram of.

[0022] In the figure, 1, filter body; 2, cover plate; 3, bottom plate; 4, feed pipeline; 5, discharge pipeline; 6, rotating shaft; 7, filter mesh; 8, purging plate; 801, air holes; 9, handle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments of the present utility model belong to the protection scope of the present utility model.

[0024] Embodiment 1

[0025] As Figure 1As shown in the figure, a preferred embodiment of the present utility model provides a self-cleaning spray pipe filter, which is used to be installed on the pulverized coal spray pipe. When the pulverized coal is sprayed, the filter filters the pulverized coal, filters out the large particles in the pulverized coal, and only retains the delicate pulverized coal, making the pulverized coal burn more fully.

[0026] Reference Figure 1 、 Figure 2 The filter mainly includes a filter body 1, a rotating shaft 6 installed inside the filter body 1, and a filter screen 7 arranged outside the rotating shaft 6. The inside of the filter body 1 has a filter cavity for installing the rotating shaft 6 and the filter screen 7. There are an installation port and a discharge port at the top and bottom of the filter cavity respectively, and a cover plate 2 and a bottom plate 3 are installed at the installation port and the discharge port respectively. The cover plate 2 and the bottom plate 3 are both fixedly connected to the filter body 1 through flanges. After the large particles in the pulverized coal are filtered down, they will deposit on the bottom plate 3, and finally the bottom plate 3 is opened to take out the large particles.

[0027] On both sides of the filter body 1, there are an inlet and an outlet communicating with the filter cavity respectively, and a feed pipe 4 and a discharge pipe 5 are welded at the inlet and the outlet respectively, so that the overall shape of the filter presents a "cross" shape. The feed pipe 4 is connected to the main pipe through a flange, and the discharge pipe 5 is connected to the corresponding pulverized coal distributor through a flange.

[0028] The rotating shaft 6 is vertically installed inside the filter body 1, and the upper end of the rotating shaft 6 is rotatably connected to the cover plate 2 through a bearing. The upper end of the rotating shaft 6 passes through the cover plate 2 and is fixedly connected to the handle 9, and the rotating shaft 6 is driven to rotate by rotating the handle 9.

[0029] Reference Figure 3 In this embodiment, five filter screens 7 are arranged on the outer circumference of the rotating shaft 6, and each filter screen 7 is composed of a single filter mesh. Each filter mesh extends along the axial and radial directions of the rotating shaft 6, and there is a certain gap between the filter mesh and the inner wall of the filter body 1 so that the filter mesh will not touch the inner wall of the filter body 1 when rotating.

[0030] At least two of the five filter screens 7 are intercepted in the channel between the inlet and the outlet, blocking the inlet and the outlet, and the filter surfaces of the two filter screens 7 directly face the inlet. The pulverized coal entering from the inlet of the filter body 1 passes through the two filter meshes and then directly passes through the next layer of filter mesh and finally exits from the outlet.

[0031] Reference Figure 4, To facilitate the cleaning of the mesh surface of the filter screen, a blowing mechanism is also provided inside the filter body 1. In this embodiment, the blowing mechanism is composed of a purging plate 8. A purging plate 8 is provided at the top of each filter screen, with a total of five purging plates 8. One end of the five purging plates 8 is integrally connected, and the other end extends along the top of the filter screen. An air passage is formed inside each purging plate 8, and the air passages in the five purging plates 8 are commonly connected to a main air passage, which is connected to an external air source. Two rows of air holes 801 communicating with the air passage are formed on the bottom surface of each purging plate 8, and the two rows of air holes 801 correspond to the two sides of the filter screen respectively.

[0032] When it is necessary to clean the filter net 7, only need to manually rotate the handle 9 to drive the rotating shaft 6 to rotate, adjust the positions of other filter nets 7, switch the positions of other non-working filter nets 7, and switch them to the position facing the inlet. Then, the two rows of air holes 801 at the bottom of the purging plate 8 blow air vertically downward to both sides of the filter screen, blowing the sundries on the filter screen away. The blown sundries will be deposited on the bottom plate 3 below, and the bottom plate 3 can be opened later to clean the sundries.

[0033] In other technical solutions, the blowing mechanism can also be integrated into the rotating shaft 6, without setting the purging plate 8. By opening an air passage inside the rotating shaft 6 and opening a number of air holes 801 communicating with the air passage on the outer wall of the rotating shaft 6, each filter screen corresponds to two rows of air holes 801, and the two rows of air holes 801 are distributed along the circumferential direction of the rotating shaft 6. The blowing direction of the air holes 801 is tangent to the filtering surface of the filter screen, and blows from the side to the surface of the filter screen to blow away the sundries on the surface of the filter screen.

[0034] Embodiment 2

[0035] As Figure 5 、 Figure 6 shown, the difference between this embodiment and Embodiment 1 is that the structure of the filter net 7 is different. In this embodiment, six filter nets 7 are arranged in the circumferential direction of the rotating shaft 6, and each filter net 7 is composed of six filter screens, and the six filter screens are combined into a hexagonal prism shape. The middle part of the rotating shaft 6 is also in the shape of a hexagonal prism, and the upper and lower ends are cylindrical. One of the six filter screens is fixed on one of the faces of the hexagonal prism of the rotating shaft 6. In this way, the filtering surface of the filter net 7 can be greatly increased.

[0036] At the same time, a purging plate 8 is provided at the top of each filter net 7. The shape of the purging plate 8 is a regular hexagon, which exactly corresponds to the six filter screens in the filter net 7. An air passage is formed inside the purging plate 8, and two rows of air holes 801 are formed at the bottom, corresponding to the two sides of the filter screen respectively. When cleaning is required, rotate the rotating shaft 6 to switch the filter net 7, and then blow high-pressure gas to the surface of the filter screen through the purging plate 8 to blow away the sundries.

[0037] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present utility model. Some changes that those skilled in the art may make to some parts thereof all reflect the principles of the present utility model and fall within the protection scope of the present utility model.

Claims

1. A self-cleaning injection pipeline filter, used for installation on a coal powder injection pipeline, comprising a filter body (1), the interior of the filter body (1) having a filter cavity, the outer side of the filter body (1) having an inlet and an outlet connected to the filter cavity, the top and bottom of the filter body (1) respectively having an installation port and a discharge port, the installation port and the discharge port respectively having a cover plate (2) and a bottom plate (3), characterized in that: A rotating shaft (6) is arranged in the filter cavity, the upper end of the rotating shaft (6) is rotatably connected to the cover plate (2), a plurality of filter screens (7) are evenly distributed along the circumferential direction on the outer side surface of the rotating shaft (6), the filter screens (7) extend along the axial direction of the rotating shaft (6), a gap is provided between the filter screens (7) and the inner wall of the filter body (1), at least two filter screens (7) block the passage between the inlet and the outlet, and an air blowing mechanism is arranged on the rotating shaft (6), the air blowing direction of the air blowing mechanism is tangent to the mesh surface of the filter screen (7).

2. The self-cleaning spray pipe filter according to claim 1, characterized in that: The filter screen (7) is a single-piece filter screen, which extends outward in the radial direction of the rotating shaft (6).

3. The self-cleaning spray pipe filter according to claim 1, characterized in that: The filter screen (7) is a columnar polygonal structure composed of a plurality of filter screens, and the columnar polygonal structure extends along the axial direction of the rotating shaft (6).

4. The self-cleaning spray pipe filter according to claim 3, characterized in that: The filter screen (7) is a hexagonal column structure composed of six filter screens, the middle portion of the rotating shaft (6) is a regular hexagonal structure, and one of the six filter screens is fixed to the outer side surface of the rotating shaft (6).

5. The self-cleaning spray pipe filter according to claim 2 or 4, characterized in that: The blowing mechanism adopts a blowing plate (8), an air passage is formed inside the blowing plate (8), the air passage is connected to an external air source, and a plurality of air holes (801) connected to the air passage are formed on the bottom surface of the blowing plate (8).

6. The self-cleaning spray pipe filter according to claim 2 or 4, characterized in that: An air channel is formed in the rotating shaft (6), and the outer side surface of the rotating shaft (6) has a plurality of air holes (801) connected to the air channel. The air channel is connected to an external air source, and the air channel and the plurality of air holes (801) together form the blowing mechanism.

7. The self-cleaning spray pipe filter according to claim 1, characterized in that: A feed pipe (4) and a discharge pipe (5) are respectively arranged at the inlet and the outlet, and flanges are installed on the feed pipe (4) and the discharge pipe (5).

8. The self-cleaning spray pipe filter according to claim 1, characterized in that: A handle (9) is installed at the upper end of the rotating shaft (6).

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