Filter with backwashing function

Abstract

The utility model belongs to the technical field of plastic processing equipment, and relates to a filter with a backwashing function, which comprises a filter box body, a filter cavity is arranged in the filter box body, a filter screen for separating the inside and the outside of the filter cavity is arranged in the filter cavity, a feed port is arranged on one side of the filter box body, and a discharge port is arranged on the other side of the filter box body. The feeding port is communicated with the filtering cavity on the inner side of the filtering net through a feeding channel, the discharging port is communicated with the filtering cavity on the outer side of the filtering net through a discharging channel, an impurity discharging port communicated with the bottom of the filtering cavity is formed in the bottom of the filtering box body, and a backwashing pipeline directly communicated with the feeding port and the discharging port is arranged outside the filtering box body. A backwashing channel which sequentially passes through the feed port, the backwashing pipeline, the discharge port, the filter cavity and the impurity discharge port is formed, and a plurality of valves for closing or opening the channel are arranged on the backwashing channel. According to the filter with the backwashing function, provided by the utility model, the filter screen can be cleaned in a backwashing manner.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic processing equipment and relates to a filter with a backwashing function. Background Art

[0002] In the process of plastic recycling, since there are a lot of impurities in the recycled plastic, it is necessary to use a filtering device to filter the molten plastic melt to remove the impurities.

[0003] Some existing filter devices are equipped with a scraper driven by a power device, which can scrape off impurities attached to the filter plate and push the impurities to accumulate at the discharge holes of the filter chamber, and then discharge the impurities by opening and closing the discharge valve.

[0004] However, when this filter device is used for a long time, the impurities cannot be completely scraped off by the scraper, and some of them still remain in the mesh of the filter, causing the filter to be blocked. When the blockage is too much, it will lead to lower filtration efficiency and worse filtration effect. At this time, the filter function of the filter device can only be restored by disassembling the filter box and cleaning the filter. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a filter with a backwashing function, which can clean the filter screen by backwashing.

[0006] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0007] A filter with a backwashing function comprises a filter box, a filter cavity is provided in the filter box, a filter screen is provided in the filter cavity for separating the filter cavity inside and outside, a feed port is provided on one side of the filter box, and a discharge port is provided on the other side, the feed port is connected with the filter cavity inside the filter screen through a feed channel, and the discharge port is connected with the filter cavity outside the filter screen through a discharge channel, a debris discharge port connected with the bottom of the filter cavity is provided at the bottom of the filter box, a backwash pipe directly connected to the feed port and the discharge port is provided outside the filter box, and a backwash channel is formed which passes through the feed port, the backwash pipe, the discharge port, the filter cavity and the debris discharge port in sequence, and a plurality of valves are provided on the backwash channel to close or open the channel.

[0008] In the above-mentioned filter with backwashing function, the valves include feed valves, discharge valves, impurity removal valves and pipeline valves; the valves can be any valves that can cut off the channel, such as motor-driven ball valves, manually driven stop valves, etc.

[0009] In the above-mentioned filter with backwashing function, a feed seat is provided on one side of the filter box and a discharge seat is provided on the other side. The feed port passes through the feed seat and the discharge port passes through the discharge seat. The two ends of the backwashing pipe are respectively connected to the feed seat and the discharge seat.

[0010] In the above-mentioned filter with backwashing function, the feed valve is arranged on the feed seat and is located on the inner side of the backwashing pipe connection. When the feed valve is closed, it blocks the material from entering the filter chamber from the feed port; the discharge valve is arranged on the discharge seat and is located on the outer side of the backwashing pipe connection. When the discharge valve is closed, it guides the material from the discharge port into the filter chamber.

[0011] In the above-mentioned filter with backwashing function, a backwashing seat is provided on the backwashing pipeline, and the pipeline valve is provided on the backwashing seat and controls the connection state of the backwashing pipeline.

[0012] In the above-mentioned filter with backwash function, a scraper shaft driven by a power device is provided in the filter chamber, and more than three spiral scrapers are circumferentially distributed and spirally arranged on the outer ring wall of the scraper shaft. The spiral scrapers are in contact with the inner wall of the filter screen. When the scraper shaft rotates, the spiral scrapers scrape off impurities and drive the impurities to move toward the impurity discharge port.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model provides a filter with a backwash function. The backwash channel is formed by a backwash pipe and various valves. During backwashing, material flows into the feed port, passes through the backwash pipe and the discharge port, and then enters the filter chamber in the reverse direction. It then passes through the filter mesh from the outside to the inside, flushing out impurities in the filter mesh and then transporting them to the discharge port for discharge. When backwashing is not in progress, the backwash channel is closed by a valve without affecting normal filtering operations. Therefore, the utility model can conveniently backwash the filter mesh and prevent clogging of the filter mesh. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 It is a top view of the utility model;

[0017] Figure 3 yes Figure 2 Axial cross-sectional view of

[0018] Figure 4 It is a three-dimensional diagram of the scraper shaft of the utility model;

[0019] Figure markings: 1. Filter box; 2. Filter chamber; 3. Filter screen; 4. Feed port; 5. Discharge port; 6. Feed channel; 7. Discharge channel; 8. Exhaust port; 9. Backwash pipe; 10. Feed valve; 11. Discharge valve; 12. Exhaust valve; 13. Pipeline valve; 14. Feed seat; 15. Discharge seat; 16. Backwash seat; 17. Power unit; 18. Scraper shaft; 19. Spiral scraper. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to specific embodiments of the present invention. Figure 1-4 :

[0021] A filter with a backwash function includes a filter box 1, a filter chamber 2 is provided in the filter box 1, a filter screen 3 is provided in the filter chamber 2 to separate the filter chamber 2 inside and outside, a feed port 4 is provided on one side of the filter box 1, and a discharge port 5 is provided on the other side, the feed port 4 is connected to the filter chamber 2 inside the filter screen 3 through a feed channel 6, and the discharge port 5 is connected to the filter chamber 2 outside the filter screen 3 through a discharge channel 7, and the bottom of the filter box 1 is provided with a discharge port 8 connected to the bottom of the filter chamber 2. A backwash pipe 9 is provided outside the filter box 1, which is directly connected to the feed port 4 and the discharge port 5, and forms a backwash channel that passes through the feed port 4, the backwash pipe 9, the discharge port 5, the filter chamber 2 and the impurity discharge port 8 in sequence. The backwash channel is provided with a number of valves for closing or opening the channel. Specifically, the valves include a feed valve 10, a discharge valve 11, a impurity discharge valve 12 and a pipeline valve 13; the valves can be any valves that can cut off the channel, such as a motor-driven ball valve, a manually driven stop valve, etc.

[0022] In this embodiment, in order to facilitate the connection of the backwash pipe 9, and also to facilitate the simultaneous provision of the feed port 4 and the feed valve 10, and the simultaneous provision of the discharge port 5 and the discharge valve 11. A feed seat 14 is provided on one side of the filter housing 1, and a discharge seat 15 is provided on the other side. The feed port 4 is provided through the feed seat 14, and the discharge port 5 is provided through the discharge seat 15. The two ends of the backwash pipe 9 are respectively connected to the feed seat 14 and the discharge seat 15. The feed valve 10 is provided on the feed seat 14 and is located inside the connection of the backwash pipe 9. When the feed valve 10 is closed, it blocks the material from entering the filter chamber 2 from the feed port 4. The discharge valve 11 is provided on the discharge seat 15 and is located outside the connection of the backwash pipe 9. When the discharge valve 11 is closed, it guides the material from entering the filter chamber 2 from the discharge port 5.

[0023] In this embodiment, in order to facilitate the setting of the pipeline valve 13, a backwash seat 16 is provided on the backwash pipeline 9, and the pipeline valve 13 is set on the backwash seat 16 and controls the connectivity state of the backwash pipeline 9; in this embodiment, the impurity discharge valve 12 is set at the bottom of the impurity discharge port 8 and controls the opening or closing of the impurity discharge port 8.

[0024] Compare with Figure 1 To the attached Figure 3 , the working process of the filter of this embodiment is:

[0025] During normal filtration in this embodiment, the feed valve 10 is opened, the discharge valve 11 is opened, and the pipeline valve 13 is closed. The molten plastic melt enters from the feed port 4, flows through the feed channel 6, and then flows into the filter cavity 2 inside the filter screen 3. After being filtered by the filter screen 3, it flows into the filter cavity 2 outside the filter screen 3 and further flows into the discharge channel 7, and finally is discharged from the discharge port 5. If necessary, the impurity discharge valve 12 can be opened to discharge impurities.

[0026] During the backwashing process of this embodiment, the feed valve 10 is closed, the discharge valve 11 is closed, the pipeline valve 13 is opened, and the impurity discharge valve 12 is opened. The flushing fluid enters from the feed port 4, then flows into the backwashing pipeline 9, and then directly enters the discharge port 5, and then flows into the filter cavity 2 outside the filter screen 3 through the discharge channel, and then passes through the filter screen 3 in the reverse direction and flows into the filter cavity 2 inside the filter screen 3, and finally is discharged from the impurity discharge port 8.

[0027] Further, refer to the attached Figure 4 The filter chamber 2 is provided with a scraper shaft 18 driven by a power device 17. Three or more spiral scrapers 19 are circumferentially distributed on the outer ring wall of the scraper shaft 18 and are arranged in a spiral pattern. The spiral scrapers 19 are in contact with the inner wall of the filter screen 3. When the scraper shaft 18 rotates, the spiral scrapers 19 scrape off impurities and drive them toward the impurity discharge port 8. In this embodiment, the scraper shaft 18 with three or more spiral scrapers 19 can better withstand the pressure caused by backwashing. Preferably, in order to facilitate the collection of impurities at the impurity discharge port 8 at the bottom, the filter screen 3 has a tapered sleeve structure with both an inner diameter and an outer diameter that are smaller in the front and larger in the back. The outer ring wall structure of the scraper shaft 18 corresponds to the structure of the filter screen 3.

[0028] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A filter with a backwashing function, comprising a filter box (1), wherein a filter cavity (2) is provided in the filter box (1), wherein a filter screen (3) is provided in the filter cavity (2) for separating the filter cavity (2) inside and outside, wherein a feed port (4) is provided on one side of the filter box (1) and a discharge port (5) is provided on the other side, wherein the feed port (4) is connected to the filter cavity (2) inside the filter screen (3) through a feed channel (6), and the discharge port (5) is connected to the filter cavity (2) outside the filter screen (3) through a discharge channel (7), and a debris discharge port (8) is provided at the bottom of the filter box (1) and is connected to the bottom of the filter cavity (2), wherein the filter box (1) is characterized in that: A backwash pipe (9) is provided outside the filter box (1) and is directly connected to the feed port (4) and the discharge port (5), and forms a backwash channel that passes through the feed port (4), the backwash pipe (9), the discharge port (5), the filter cavity (2) and the impurity discharge port (8) in sequence. The backwash channel is provided with a plurality of valves for closing or opening the channel.

2. A filter with backwashing function according to claim 1, characterized in that: The valves include a feed valve (10), a discharge valve (11), a waste removal valve (12) and a pipeline valve (13).

3. The filter with backwashing function according to claim 2, characterized in that: A feed seat (14) is provided on one side of the filter box (1), and a discharge seat (15) is provided on the other side; the feed port (4) passes through the feed seat (14), and the discharge port (5) passes through the discharge seat (15); and both ends of the backwash pipe (9) are connected to the feed seat (14) and the discharge seat (15), respectively.

4. The filter with backwashing function according to claim 3, characterized in that: The feed valve (10) is arranged on the feed seat (14) and is located on the inner side of the connection of the backwash pipe (9). When the feed valve (10) is closed, it blocks the material from entering the filter chamber (2) from the feed port (4); the discharge valve (11) is arranged on the discharge seat (15) and is located on the outer side of the connection of the backwash pipe (9). When the discharge valve (11) is closed, it guides the material from the discharge port (5) into the filter chamber (2).

5. The filter with backwashing function according to claim 2, characterized in that: A backwash seat (16) is provided on the backwash pipe (9), and the pipe valve (13) is provided on the backwash seat (16) and controls the communication state of the backwash pipe (9).

6. The filter with backwashing function according to claim 1, characterized in that: A scraper shaft (18) driven by a power device (17) is provided in the filter chamber (2). Three or more spiral scrapers (19) are circumferentially distributed on the outer ring wall of the scraper shaft (18) and are arranged in a spiral manner. The spiral scrapers (19) are in contact with the inner wall of the filter screen (3). When the scraper shaft (18) rotates, the spiral scrapers (19) scrape off impurities and drive the impurities to move toward the impurity discharge port.

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