Filter screen assembly and filter comprising same

Abstract

The utility model discloses a filter screen assembly and a filter comprising the same. The filter screen assembly comprises a filter screen base, a filter screen top and a filter screen surrounding between the filter screen base and the filter screen top, wherein filter holes are formed in the filter screen, and the interior of the filter screen is defined by the filter screen base, the filter screen top and the filter screen; a one-way valve is arranged at the top of the filter screen, only allows fluid to flow to the outside of the filter screen from the inside of the filter screen, and is conducted only when the pressure difference between the outside of the filter screen and the inside of the filter screen reaches a threshold value. The inside and the outside of the filter screen are communicated to realize pressure relief, so that the pressure inside and outside the filter screen can be basically balanced, the pressure difference is very small and is far less than the mechanical strength of the filter screen even if the pressure difference exists, the mechanical structure of the filter screen cannot be damaged, and the quality and potential safety hazards of deformation and damage of the filter screen caused by abnormal pressure are eliminated; the filter screen of the filter is effectively protected, the structure is simple, the use is convenient, the adaptability is strong, and the realization is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a filter screen assembly and a filter containing the same. Background Art

[0002] A filter is a commonly used device in the water treatment process, which can effectively reduce some suspended matters or other harmful impurities and pollutants in water quality by physical methods. The filter screen, also called the filter element, is the core component of the filter. According to different process requirements, the filter screen in the filter can be designed into different precision grades and structural shapes to meet the requirements of the treated effluent.

[0003] During the working process, if the quality of the influent water is too poor, the filter screen may be blocked and needs to be cleaned. When cleaning, it becomes difficult for the high-pressure cleaning water to be injected into the filter cylinder through the cleaning pipe nozzle. And in the state of severe blockage of the filter screen, when the filter screen is affected by the abnormal external pressure (cleaning water water pressure), the inside and outside of the filter screen are in a state of unbalanced force. Once the external pressure exceeds a certain value, the filter screen will be crushed or other deformations and damages will occur, causing the entire filtration equipment system to be damaged and unable to work, and even causing the entire production line to stop production, bringing huge economic losses and safety hazards to normal production.

[0004] Therefore, the above prior art has at least the following technical problems: When flushing the blocked filter screen of the filter in the prior art, the filter screen is easily crushed or damaged due to the unbalanced force inside and outside the filter screen. Summary of the Utility Model

[0005] By providing a filter screen assembly and a filter containing the same in an embodiment of the present application, the technical problem that the filter screen is easily crushed or damaged due to the unbalanced force inside and outside the filter screen when flushing the blocked filter screen in the prior art is solved.

[0006] To solve the above technical problem, in a first aspect, an embodiment of the present application provides a filter screen assembly, which includes a filter screen base, a filter screen top, and a filter screen surrounding between the filter screen base and the filter screen top; wherein, filter holes are formed in the filter screen, and the filter screen base, the filter screen top, and the filter screen enclose a filter screen interior.

[0007] A one-way valve is provided on the filter screen top, the one-way valve only allows fluid to flow from the filter screen interior to the filter screen exterior, and the one-way valve only conducts when the pressure difference between the filter screen exterior and the filter screen interior reaches a threshold value.

[0008] Further, the filter screen base is a filter screen flange.

[0009] Furthermore, a check valve mounting seat is provided on the top of the filter screen, and the check valve is fixed on the top of the filter screen through the check valve mounting seat.

[0010] Furthermore, a plurality of the check valves are arranged on the top of the filter screen.

[0011] In a second aspect, an embodiment of the present application further provides a filter, including the filter screen assembly according to any one of the first aspect.

[0012] Furthermore, the filter includes a filter cartridge, and the filter screen assembly is fixed on the inner bottom of the filter cartridge through the filter screen base.

[0013] Furthermore, the filter further includes a liquid inlet, and the liquid inlet is arranged at the bottom of the filter assembly and is communicated with the inside of the filter screen.

[0014] Furthermore, a liquid discharge port is further provided on one side of the upper part of the filter cartridge, and the liquid discharge port is communicated with the filter cartridge to discharge the liquid filtered by the filter screen assembly.

[0015] Furthermore, the filter is also provided with a cleaning system, and the cleaning system includes a cleaning pipe located between the filter cartridge and the filter screen assembly, and nozzles facing the filter screen assembly are arranged on the cleaning pipe.

[0016] Furthermore, a sewage discharge port is also provided at the bottom of the filter cartridge, and the sewage discharge port is communicated with the inside of the filter screen.

[0017] As can be seen from the above description, in the filter screen assembly described in the embodiment of the present application, by setting a check valve, when the filter screen assembly is working normally, the pressure inside the filter screen and the pressure outside the filter screen are basically balanced, the check valve is in a closed state, and the water inside the filter screen will not be discharged to the outside of the filter screen through the check valve. If the filter screen assembly is affected by abnormal external pressure, the pressure outside the filter screen exceeds the pressure inside the filter screen, and when the pressure difference reaches the threshold value, the check valve opens, and the inside and outside of the filter screen are conducted to achieve pressure relief, so as to ensure that the pressure inside and outside the filter screen is basically balanced. Even if there is a pressure difference, it is very small, far less than the mechanical strength of the filter screen, and the mechanical structure of the filter screen will not be damaged. Therefore, the filter screen assembly described in the embodiment of the present application eliminates the quality and safety hazards of the filter screen being deformed and damaged due to abnormal pressure. Under abnormal working conditions, it can ensure the pressure balance between the inside and outside of the filter screen, provides effective protection for the filter screen of the filter, and has a simple structure, is easy to use, has strong adaptability, and is easy to implement. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of a filter screen assembly in an embodiment of the present invention;

[0020] Figure 2 It is a top view of a filter screen assembly in an embodiment of the present invention;

[0021] Figure 3 It is a cross-sectional view of a filter screen assembly in an embodiment of the present invention;

[0022] Figure 4 It is a schematic structural diagram of a check valve and a check valve mounting seat in an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of the filtering principle of a filter in an embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the cleaning principle of a filter in an embodiment of the present invention. Detailed implementation manners

[0025] By providing a filter screen assembly and a filter containing the same in the embodiments of the present application, the technical problem in the prior art that when flushing a clogged filter screen of a filter, the filter screen is easily flattened or damaged due to unbalanced internal and external forces on the filter screen is solved.

[0026] To better understand the above technical solutions, the following will elaborate on the above technical solutions in combination with the drawings in the specification and specific implementation manners.

[0027] As Figures 1 to 6 shown, in one or more embodiments of the present application, a filter screen assembly is provided. The filter screen assembly includes a filter screen base 3, a filter screen top 1, and a filter screen 2 surrounding between the filter screen base 3 and the filter screen top 1. Among them, filter holes are formed on the filter screen 2, and the filter screen base 3, the filter screen top 1, and the filter screen 2 enclose a filter screen interior a;

[0028] A check valve 4 is provided on the filter screen top 1. The check valve 4 only allows fluid to flow from the filter screen interior a to the outside of the filter screen, and the check valve 4 is only opened when the pressure difference between the outside of the filter screen and the filter screen interior a reaches a threshold value.

[0029] From the above description, it can be known that the filter assembly described in the embodiment of the present application is provided with a one-way valve 4. When the filter assembly is working normally, the pressure a inside the filter and the pressure outside the filter are basically balanced, and the one-way valve 4 is in a closed state. The water inside the filter a will not be discharged to the outside of the filter through the one-way valve 4. If the filter assembly is affected by abnormal external pressure, the pressure outside the filter exceeds the pressure a inside the filter, and when the pressure difference reaches a threshold, the one-way valve 4 opens, and the filter 2 is connected inside and outside to achieve pressure relief, thereby ensuring that the pressure inside the filter a and the pressure outside the filter are basically balanced. Even if there is a pressure difference, it is very small, far less than the mechanical strength of the filter 2, and will not damage the mechanical structure of the filter 2.

[0030] Therefore, the filter assembly described in the embodiment of the present application eliminates the quality and safety hazards of deformation and damage of the filter 2 due to abnormal pressure. Under abnormal operating conditions, it can ensure the pressure balance between the inside a of the filter and the outside of the filter, and provide effective protection for the filter 2 of the filter. It also has a simple structure, is easy to use, has strong adaptability, and is easy to implement.

[0031] In addition, the above threshold value is determined according to specific working conditions, and an appropriate one-way valve 4 is selected accordingly. The one-way valve 4 uses a mature product already available in the market.

[0032] It is understandable that the filter screen 2 can be designed to have different filtering accuracies according to different process requirements. In addition, the upper end of the filter screen 2 is fixed on the filter screen top 1, the lower end of the filter screen 2 is fixed on the filter screen base 3, and the filter screen 2 is annular. The filter screen exterior refers to the part outside the filter screen interior a.

[0033] like Figures 1 to 3 , Figures 5 to 6 As shown, as an implementable manner, the filter base 3 is a filter flange, and the filter flange can be fixed on the filter cartridge 8 (see below for details), so as to achieve the fixation of the filter assembly in the filter cartridge 8.

[0034] like Figures 1 to 6 As shown, as an implementation method, the one-way valve 4 is fixed on the filter screen top 1 through the one-way valve mounting seat 5. Specifically, the filter screen top 1 is an impermeable plate structure, such as a stainless steel plate, which is convenient for setting the one-way valve mounting seat 5.

[0035] like Figure 1 As shown, as an implementable embodiment, a plurality of (not less than two) one-way valves 4 are arranged on the filter top 1, so that the pressure relief efficiency can be improved and damage to the filter 2 can be avoided. For example, 4, 6, more or less one-way valves 4 can be set, depending on the specific working conditions, which is not limited here.

[0036] The filter assembly can be used in a filter, such as Figure 5 ,6 As shown, the filter includes a filter cartridge 8, and the filter screen assembly is fixed to the inner bottom of the filter cartridge 8 through the filter screen base 3;

[0037] The filter further includes a liquid inlet 81, and the liquid inlet 81 is arranged at the bottom of the filter cartridge 8 and communicates with the inside a of the filter screen;

[0038] On one side of the upper part of the filter cartridge 8, a liquid outlet 82 is further provided, and the liquid outlet 82 communicates with the filter cartridge 8 to discharge the liquid filtered by the filter screen assembly.

[0039] Specifically, as Figure 5 shown, the liquid to be filtered (such as sewage) entering through the liquid inlet 81 below enters the inside a of the filter screen, is filtered by the filter screen 2, and the filtered liquid is discharged through the liquid outlet 82 above to enter subsequent other processes.

[0040] The object filtered by the filter in the embodiment of the present application can be sewage. Of course, it can also be other liquids, which is not limited herein.

[0041] As Figure 5 、 6 shown, as an implementable embodiment, the filter is further provided with a cleaning system, and the cleaning system includes a cleaning pipe 6 located between the filter cartridge 8 and the filter screen assembly, and nozzles facing the filter screen assembly are provided on the cleaning pipe 6.

[0042] After working for a certain period of time, the inner surface of the filter screen 2 will adhere and become blocked, and the filtration efficiency will decrease. At this time, the cleaning pipe 6 injects cleaning water (generally clean water) from the outside, and the cleaning water is sprayed onto the outer surface of the filter screen 2 through the nozzles under high pressure, so as to wash away the adhered and blocked substances inside the filter screen 2 and unblock the filter holes. Under the condition that the filter screen 2 is severely blocked, if the filter screen 2 is affected by abnormal external pressure and the external pressure exceeds the internal pressure by a certain value, the filter screen 2 has the risk of being flattened or otherwise deformed and damaged, resulting in the damage of the equipment system and inability to work, and even causing more serious accidents.

[0043] Since a check valve 4 is installed on the filter screen assembly, during normal operation, the pressures inside and outside the filter screen 2 are basically balanced, the check valve 4 is in a closed state, and the water inside the filter screen a will not be discharged outside the filter screen 2 through the check valve 4. If the filter screen 2 is affected by abnormal external pressure and the external pressure exceeds the internal pressure by a certain value, the check valve 4 opens, and the inside and outside of the filter screen 2 are communicated, so as to ensure that the pressures between the inner wall and the outer wall of the filter screen 2 are basically balanced. Even if there is a pressure difference, it is very small, far less than the mechanical strength of the filter screen 2, and will not damage the mechanical structure of the filter screen 2.

[0044] As Figure 5 、 6As shown, as an implementable embodiment, the cleaning pipe 6 is connected to a cleaning water replenishing port 7, and cleaning water can be replenished through the cleaning water replenishing port 7.

[0045] As Figure 5 , 6 As shown, as an implementable embodiment, a sewage discharge port 83 is further provided at the bottom of the filter cartridge 8, and the sewage discharge port 83 communicates with the inside a of the filter screen.

[0046] It can be understood that the residues accumulated by the filtration of the filter net 2 can be discharged through the sewage discharge port 83, so as to ensure the continuous use of the filter.

[0047] It should be understood that although terms such as "first" and "second" may be used here to describe each unit, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiment, the first unit may be called the second unit, and similarly the second unit may be called the first unit.

[0048] The orientation terms such as outside, middle, and inside mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts, and thus may change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0049] The above is only a preferred embodiment of the present application, and it does not impose any formal or substantial limitations on the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the premise of the method of the present application, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention. Those skilled in the art, without departing from the spirit and scope of the present application, when making some equivalent changes, modifications, and evolutions using the technical content disclosed above, are all equivalent embodiments of the present application; at the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essential technology of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A filter assembly, characterized in that: The filter assembly comprises a filter base (3), a filter top (1), and a filter (2) surrounding the filter base (3) and the filter top (1); wherein the filter (2) is provided with filter holes, and the filter base (3), the filter top (1) and the filter (2) enclose a filter interior (a); A one-way valve (4) is provided on the top (1) of the filter screen. The one-way valve (4) only allows fluid to flow from the inside (a) of the filter screen to the outside of the filter screen, and the one-way valve (4) will only be opened when the pressure difference between the outside of the filter screen and the inside (a) of the filter screen reaches a threshold value.

2. A filter assembly according to claim 1, characterized in that: The filter base (3) is a filter flange.

3. A filter assembly according to claim 1, characterized in that: A one-way valve mounting seat (5) is provided on the filter screen top (1), and the one-way valve (4) is fixed on the filter screen top (1) via the one-way valve mounting seat (5).

4. A filter assembly as claimed in claim 3, characterized in that: A plurality of one-way valves (4) are arranged on the filter screen top (1).

5. A filter comprising the filter assembly according to any one of claims 1 to 4.

6. A filter according to claim 5, characterized in that: The filter comprises a filter cartridge (8), and the filter screen assembly is fixed on the inner bottom of the filter cartridge (8) via the filter screen base (3).

7. A filter according to claim 6, characterized in that: The filter further comprises a liquid inlet (81), wherein the liquid inlet (81) is arranged at the bottom of the filter screen assembly and is in communication with the interior (a) of the filter screen.

8. A filter according to claim 7, characterized in that: A liquid discharge port (82) is also provided on one side of the upper portion of the filter cartridge (8), and the liquid discharge port (82) is in communication with the filter cartridge (8) so as to discharge liquid filtered by the filter screen assembly.

9. The filter according to claim 8, characterized in that The filter is also provided with a cleaning system, which comprises a cleaning pipe (6) located between the filter cartridge (8) and the filter screen assembly, and the cleaning pipe (6) is provided with a nozzle facing the filter screen assembly.

10. The filter according to claim 9, characterized in that The bottom of the filter cartridge (8) is also provided with a sewage outlet (83), and the sewage outlet (83) is communicated with the interior (a) of the filter screen.

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