External backwashing filter

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to an external backwashing filter which comprises an outer shell, a water inlet is formed in the upper portion of the side wall of the outer shell, a water outlet is formed in the lower portion of the side wall of the outer shell, a filtering device is arranged in the outer shell, the water inlet is connected with the filtering device, and the filtering device comprises an inner shell located in the outer shell. And the periphery of the outer side wall of the inner shell is suspended at the middle upper part of the inner cavity of the outer shell through a bracket. According to the utility model, when the filter screen needs to be backwashed, the water inlet valve is firstly closed, then the water outlet valve is closed, then the backwash valve on the backwash pipe is opened, clean water for washing enters the inner part of the outer shell through the backwash pipe, and at the moment, water for washing is reversely washed into the inner shell from the inner part of the outer shell, so that impurities on the filter screen are washed down; after the motor is started to drive the stirring shaft and the blades to rotate, the flow speed of the water body is increased, impurities are better cleaned, waste water after washing is discharged out of the inner shell through the waste water pipe, and back washing is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an external backwashing filter. Background Art

[0002] Sewage treatment is a vital environmental protection project, the main purpose of which is to remove harmful substances from sewage so that it meets the discharge standard or reuse standard. With the acceleration of urbanization and the increase of industrial and agricultural activities, sewage treatment has become an important measure to ensure the safety of water resources and the health of the ecological environment.

[0003] In some existing sewage treatment devices, sewage enters the device, is filtered through the internal filter screen, filter element, etc., and then undergoes preliminary filtration of impurities before entering the rest of the sewage treatment device. However, in ordinary sewage treatment devices, since the filter screen is installed inside, it is inconvenient to clean, so it is necessary to develop an external backwash filter. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0006] An external backwash filter comprises an outer shell, wherein a water inlet is provided above the side wall of the outer shell, and a water outlet is provided below the side wall, a filtering device is arranged inside the outer shell, the water inlet is connected to the filtering device, the filtering device comprises an inner shell located inside the outer shell, the outer side wall of the inner shell is suspended by a bracket around and located above the inner cavity of the outer shell, the bracket is fixed to the inner side of the outer shell, through openings are provided on the side walls around the inner shell, a filtering net is installed on the through openings, a water inlet end is provided on the top of the inner shell, the water inlet end is connected with the water inlet and the inner cavity of the inner shell, the outer side wall of the outer shell is provided with a backwashing pipe connected with the inner cavity of the outer shell, the backwashing pipe is located above the inner shell, and a backwashing valve is provided on the backwashing pipe.

[0007] As a preferred solution of the external backwash filter described in the utility model, wherein: the water inlet is connected to a water inlet pipe, and the water inlet pipe is provided with a water inlet valve.

[0008] As a preferred solution of the external backwash filter described in the utility model, the water outlet is connected to a water outlet pipe, and a water outlet valve is arranged on the water outlet pipe.

[0009] As a preferred solution of an external backwash filter described in the utility model, a motor is arranged on the top of the outer shell, the output shaft of the motor rotates through the outer shell and the top of the inner shell and is connected to a stirring shaft, the stirring shaft rotates and is located on the inner side of the inner shell and is surrounded by stirring blades.

[0010] As a preferred solution of the external backwash filter described in the utility model, a sealing layer 1 and a sealing layer 2 are respectively arranged on the inner and outer sides of the connection between the backwash pipe and the outer shell.

[0011] As a preferred solution of an external backwash filter described in the utility model, a waste water pipe is arranged on one side of the bottom of the outer shell, the waste water pipe is connected to the inner cavity of the inner shell, and a waste water valve is arranged on the outside of the outer shell.

[0012] The beneficial effect of the utility model is that when the filter screen needs to be backwashed, the water inlet valve is first closed to stop the sewage from entering, and after the water inside the outer shell is discharged through the outlet pipe, the outlet valve is closed again, and the backwash valve on the backwash pipe is opened again, and the clean water for flushing enters the interior of the outer shell through the backwash pipe. At this time, the flushing water is reversely flushed from the interior of the outer shell into the interior of the inner shell, thereby flushing the impurities on the filter screen, and then the motor is turned on to drive the stirring shaft and blades to rotate, thereby increasing the flow rate of the water body and better cleaning the impurities, and then the wastewater valve is opened, and the flushed wastewater is discharged from the interior of the inner shell through the wastewater pipe to complete the backwashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the implementation of the utility model, the utility model will be described in detail below in combination with the drawings and detailed implementation. Obviously, the drawings described below are only some implementations of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the inner shell of the utility model when viewed from above; DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0018] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0019] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] See also Figure 1-Figure 2 , shows a schematic diagram of the structure of an external backwash filter implementation of the utility model, please refer to Figure 1-Figure 2 , an external backwash filter is introduced in detail.

[0021] An external backwash filter, comprising an outer shell 10, a water inlet 9 is opened on the upper side wall of the outer shell 10, a water outlet 8 is opened on the lower side wall, a filtering device is arranged inside the outer shell 10, the water inlet 9 is connected to the filtering device, the filtering device comprises an inner shell 3 located inside the outer shell 10, the outer side wall of the inner shell 3 is suspended by a bracket around the inner cavity of the outer shell 10, the bracket is fixed on the inner side of the outer shell 10, the inner shell 3 is opened on the side wall around the through hole 1, the through hole 1 is opened on the inner side wall of the inner shell 3, and the through hole 1 is opened on the inner side wall of the inner shell 3. A filter screen 2 is installed on the port 1. Since the filtering device is suspended in the middle and upper part of the inner cavity of the outer shell 10, the water filtered by the solid filter screen 2 will remain below the inner cavity of the outer shell 10. A water inlet end 16 is opened on the top of the inner shell 3. The water inlet end 16 connects the water inlet 9 and the inner cavity of the inner shell 3. The outer side wall of the outer shell 10 is provided with a backwashing pipe 11 connected to the inner cavity of the outer shell 10. The backwashing pipe 11 is located above the inner shell 3, and a backwashing valve 12 is provided on the backwashing pipe 11.

[0022] Furthermore, the water inlet 9 is connected to a water inlet pipe, and a water inlet valve is provided on the water inlet pipe. The sewage to be treated flows into the inner cavity of the inner shell 3 through the water inlet pipe, the water inlet 9, and the water inlet end 16, is filtered through the filter net 2, and flows into the lower part of the inner cavity of the outer shell 10 through the through port 1.

[0023] Furthermore, the water outlet 8 is connected to a water outlet pipe, and a water outlet valve is provided on the water outlet pipe, so that the treated water is discharged through the water outlet 8 and the water outlet pipe.

[0024] Furthermore, a motor 15 is provided at the top of the outer shell 10, and the output shaft of the motor 15 rotates through the outer shell 10 and the top of the inner shell 3 and is connected to a stirring shaft. The stirring shaft rotates and is located on the inner side of the inner shell 3 and is surrounded by stirring blades, which are not shown in the figure.

[0025] Furthermore, a sealing layer 1 4 and a sealing layer 2 5 are respectively provided inside and outside the connection between the backwash pipe 11 and the outer shell 10. The provided sealing layers improve the sealing performance of the backwash pipe 11 and reduce water leakage.

[0026] Furthermore, a waste water pipe 13 is provided on one side of the bottom of the outer shell 10 , and the waste water pipe 13 is connected to the inner cavity of the inner shell 13 . The waste water pipe 13 is located outside the outer shell 10 and is provided with a waste water valve 14 , and the flushed water is discharged through the waste water pipe 13 .

[0027] It should be noted that Figure 2 In the figure, numbers 6 and 7 do not refer to components. Number 6 refers to the direction in which sewage is filtered through the filter 2, that is, the sewage flows from the inside of the inner shell 3 to the inside of the outer shell after being filtered; number 7 refers to the direction in which clean water for flushing enters the inner cavity of the inner shell 3 through the backwash pipe 11.

[0028] In the specific use process, when sewage is treated, sewage flows from the inside of the inner shell 3 to the inside of the outer shell, and solid impurities remain on the inner side of the filter screen 2 inside the inner shell 3; when the filter screen 2 needs to be backwashed, the water inlet valve is first closed to stop the sewage from entering, and after the water inside the outer shell 10 is discharged through the outlet pipe, the outlet valve is closed again, and the backwash valve 12 on the backwash pipe 11 is opened, and the flushing clean water enters the inside of the outer shell 10 through the backwash pipe 11. At this time, the flushing water is reversely flushed from the inside of the outer shell 10 into the inside of the inner shell 3, thereby flushing the impurities on the filter screen 2, and then the motor 15 is turned on to drive the stirring shaft and the blades to rotate, thereby increasing the flow rate of the water body and better cleaning the impurities, and then the wastewater valve 14 is opened, and the flushed wastewater is discharged from the inside of the inner shell 3 through the wastewater pipe 13 to complete the backwashing.

[0029] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An external backwash filter, characterized in that: The invention comprises an outer shell (10), wherein a water inlet (9) is provided on the upper side wall of the outer shell (10) and a water outlet (8) is provided on the lower side wall thereof, wherein a filtering device is arranged inside the outer shell (10), wherein the water inlet (9) is connected to the filtering device, wherein the filtering device comprises an inner shell (3) located inside the outer shell (10), wherein the outer side wall of the inner shell (3) is suspended by a bracket and located above the inner cavity of the outer shell (10), wherein the bracket is fixed on the inner side of the outer shell (10), and wherein the inner shell (3) is provided with a filter. (3) The side walls are provided with openings (1), a filter screen (2) is installed on the openings (1), a water inlet end (16) is opened on the top of the inner shell (3), the water inlet end (16) is connected to the water inlet (9) and the inner cavity of the inner shell (3), the outer wall of the outer shell (10) is provided with a backwashing pipe (11) connected to the inner cavity of the outer shell (10), the backwashing pipe (11) is located above the inner shell (3), and a backwashing valve (12) is provided on the backwashing pipe (11).

2. An external backwash filter according to claim 1, characterized in that: The water inlet (9) is connected to a water inlet pipe, and a water inlet valve is arranged on the water inlet pipe.

3. An external backwash filter according to claim 1, characterized in that: The water outlet (8) is connected to a water outlet pipe, and a water outlet valve is arranged on the water outlet pipe.

4. An external backwash filter according to claim 1, characterized in that: A motor (15) is arranged at the top of the outer shell (10), and an output shaft of the motor (15) rotates through the outer shell (10) and the top of the inner shell (3) and is connected to a stirring shaft, and the stirring shaft rotates and is located inside the inner shell (3) and is surrounded by stirring blades.

5. An external backwash filter according to claim 1, characterized in that: A sealing layer 1 (4) and a sealing layer 2 (5) are respectively provided on the inner and outer sides of the connection between the backwash pipe (11) and the outer shell (10).

6. An external backwash filter according to claim 1, characterized in that: A waste water pipe (13) is provided on one side of the bottom of the outer shell (10), the waste water pipe (13) is connected to the inner cavity of the inner shell (3), and a waste water valve (14) is provided on the waste water pipe (13) outside the outer shell (10).

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