Residual-liquid-free filter cartridge and filtering regeneration method thereof

Abstract

The invention discloses a raffinate-free filter cartridge and a filtration regeneration method thereof, and relates to the technical field of filtration, the raffinate-free filter cartridge comprises a cartridge body and a filter element, the filter element is vertically arranged in the cartridge body, the bottom of the cartridge body is provided with a solid discharge port, a liquid inlet pipeline and a gas inlet pipeline, the top of the cartridge body is provided with a liquid outlet pipeline and a cleaning pipeline which are communicated with the filter element, and the solid discharge port is provided with a solid discharge valve; the top of an inner cavity of the barrel is communicated with a first air supply pipeline, and the bottom of the inner cavity of the barrel is communicated with a residual liquid and residual liquid return pipeline; residual liquid in the barrel can be pressed into the residual liquid return pipeline through gas supplied by the first gas supply pipeline, then the second gas supply pipeline is opened, impurities in the barrel and on the filter element are blow-dried, the solid discharge valve is opened, compressed gas is input through the top inner cavity to blow off solid impurities in the filter element, and the solid impurities are discharged from the solid discharge port. And residual-liquid-free solid-liquid separation of the filter cartridge is realized.

Description

Technical Field

[0001] The present invention relates to the field of filtration technology, in particular to a residual liquid-free filter cartridge and a filtration regeneration method thereof. Background Art

[0002] With the rapid development and application of advanced technology, the requirements for fluids in both life and industrial production are getting higher and higher, especially in the food industry. At present, filters are often used as the main filtering equipment for food in the market. The core component of the filter is the filter element. However, the filter element will gradually be blocked by impurities during use and cannot continue to work. However, if the filter element that cannot work is discarded and replaced with a new one, it will cause a large investment in consumables.

[0003] In order to solve the problem of filter element blockage in the prior art, backwash regeneration is often adopted. Specifically, gas or liquid is used as the cleaning fluid, and the cleaning fluid enters the liquid outlet of the filter element. The cleaning fluid flows in the opposite direction to the filtered liquid, thereby flushing out the impurities blocking the filter element and discharging them from the solid discharge port at the bottom of the filter. However, in the process of sewage discharge, the cleaning fluid is discharged together with the original liquid and impurities in the filter, resulting in waste of the original liquid.

[0004] Therefore, people are in urgent need of a filter cartridge with no residual liquid that saves raw liquid resources and has good regeneration effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a filter cartridge with no residual liquid and a filter regeneration method thereof to solve the problems existing in the above-mentioned prior art. Before discharging sewage, the original liquid in the cartridge is pressed out by the air supply of the first air supply pipeline, thereby reducing the waste of the original liquid during the sewage discharge process and improving the regeneration effect.

[0006] To achieve the above-mentioned objectives, the present invention provides the following solution: The present invention provides a residual liquid-free filter cartridge, comprising a cylinder body and a filter element, the filter element being vertically arranged in the cylinder body, a solid discharge port and a liquid inlet pipeline being provided at the bottom of the cylinder body, a liquid outlet pipeline connected to the filter element and a cleaning pipeline connected to the filter element being provided at the top, a solid discharge valve being provided at the solid discharge port, the top of the inner cavity of the cylinder body being connected to a first air supply pipeline, the bottom of the inner cavity of the cylinder body being connected to a residual liquid return pipeline, and valves being provided on the liquid inlet pipeline, the liquid outlet pipeline, the cleaning pipeline, the first air supply pipeline and the residual liquid return pipeline.

[0007] Preferably, the bottom of the inner cavity of the cylinder is connected to a second air supply line, and the top of the cylinder is provided with a third air supply line connected to the filter element and an exhaust line for exhaust, and valves are provided on the second air supply line, the exhaust line and the third air supply line.

[0008] Preferably, the third gas supply pipeline is provided with a first regulating valve for regulating pressure.

[0009] Preferably, the air inlet end of the second air supply pipeline and the air inlet end of the first air supply pipeline are connected to a low-pressure pipeline, the low-pressure pipeline is connected to the air outlet end of the compressed gas, and a second regulating valve for regulating pressure is provided on the low-pressure pipeline.

[0010] Preferably, the air inlet end of the third air supply pipeline and the air inlet end of the low-pressure pipeline are connected to the main air supply pipeline, and the main air supply pipeline is connected to the air outlet end of the compressed gas supply equipment.

[0011] Preferably, the bottom of the inner cavity of the cylinder is connected to a third air supply pipeline, and the top of the cylinder is provided with a residual liquid outlet pipeline. The liquid inlet of the residual liquid outlet pipeline is located at the bottom of the inner cavity of the filter element.

[0012] Preferably, the third air supply pipeline and the second air supply pipeline are the same pipeline.

[0013] Preferably, the liquid outlet pipeline, the cleaning pipeline and the third air supply pipeline are all connected to the filter element through the liquid outlet of the aggregating pipeline of several filter elements.

[0014] Preferably, the residual liquid return pipeline and the liquid inlet pipeline are connected to the bottom of the inner cavity of the cylinder through a connecting pipe.

[0015] The present invention also provides a method for filtering and regenerating the above-mentioned residual liquid filter cartridge, comprising the following steps:

[0016] S1: Stop the liquid inlet line, open the pressure return line and the first low-pressure air supply line, and the original liquid in the cylinder is pressed out;

[0017] S2: After the original pressure is discharged, the pressure return pipeline and the first low-pressure air supply pipeline are closed, and the second low-pressure air supply pipeline and the exhaust pipeline are opened to blow and solidify the filter cake;

[0018] S3: After the blowing is completed, close the second low-pressure air supply pipeline and the exhaust pipeline, open the high-pressure air supply pipeline and the drain valve, and blow the filter cake out;

[0019] S4: After the filter cake is discharged, close the high-pressure air supply pipeline and open the cleaning pipeline to clean the remaining impurities;

[0020] S5: After cleaning is completed, close the drain valve and the cleaning pipeline, open the third air supply pipeline and the residual liquid outlet pipeline, and drain the residual liquid in the filter element.

[0021] Compared with the prior art, the present invention mainly achieves the following technical effects:

[0022] The gas supplied through the first air supply pipeline can press the original liquid in the cylinder into the residual liquid return pipeline. After all the original liquid in the cylinder is pressed out, the cleaning pipeline can be opened and moved from the inside of the filter element to the outside of the filter element to remove impurities and filter cakes on the filter element. The cleaning agent carrying impurities is discharged from the solid discharge port to achieve the regeneration of the filter element. Since there is no original liquid in the cylinder at this time, the waste of original liquid is greatly reduced and the original liquid resources are saved. At the same time, since the cleaning liquid moves from the inside to the outside, the outside of the filter cake outside the filter element is not supported by the pressure of the original liquid, the filter cake is easier to be removed, and the regeneration effect of the filter element is improved.

[0023] Compared with the prior art, other solutions of the present invention have achieved the following technical effects:

[0024] The cooperation of the second air supply pipeline and the exhaust pipeline realizes the circulation of gas in the cylinder, and realizes the blowing and solidification of the filter cake. At this time, the viscosity of the filter cake is reduced due to the lack of moisture. The gas of the third air supply pipeline is used to blow air from the inside of the filter element to the outside to blow off the filter cake and impurities in the filter element, thereby improving the regeneration effect of the filter element. At the same time, the liquid content of the debris discharged from the solid discharge port is low, which improves the convenience of its cleaning and subsequent processing.

[0025] The cooperation between the third air supply pipeline and the residual liquid outlet pipeline can discharge the residual liquid in the filter element, avoid affecting the original liquid to be filtered next time, and improve the filtering effect of the original liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of the structure of the filter cartridge without residual liquid in an embodiment of the present invention;

[0028] Among them, 1. Cylinder; 2. Exhaust pipeline; 3. Solids discharge valve; 4. Liquid inlet pipeline; 5. Liquid outlet pipeline; 6. Cleaning pipeline; 7. First air supply pipeline; 8. Residual liquid return pipeline; 9. Second air supply pipeline; 10. Third air supply pipeline; 11. Residual liquid outlet pipeline. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the invention, not all of them. All other embodiments derived by ordinary technicians in this field based on the embodiments of the invention without making any creative efforts shall fall within the scope of protection of the invention.

[0030] The purpose of the present invention is to provide a filter cartridge without residual liquid and a filter regeneration method thereof to solve the problems existing in the prior art. Before discharging sewage, the original liquid in the cartridge is pressed out by the air supply of the first air supply pipeline, thereby reducing the waste of the original liquid during the sewage discharge process and improving the regeneration effect.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Please refer to Figure 1 As shown, a residual liquid-free filter cartridge is provided, comprising a cylinder 1 and a filter element. The filter element is vertically arranged in the cylinder 1 through a frame. In order to improve the filtering effect, multiple filter elements are provided. The filter element can choose a membrane filter element. A solid discharge port and a liquid inlet pipe 4 are provided at the bottom of the cylinder 1, and a liquid outlet pipe 5 and a cleaning pipe 6 are provided at the top. The liquid outlet pipe 5 and the cleaning pipe 6 are both connected to the inner cavity of the filter element. A solid discharge valve 3 is provided at the solid discharge port. The top of the inner cavity of the cylinder 1 is connected to the first air supply pipe 7, and the bottom of the inner cavity of the cylinder 1 is connected to the residual liquid return pipe 8, the liquid inlet pipe 4, the liquid outlet pipe 5, the cleaning pipe 6, the first air supply pipe 7 and the residual liquid return pipe 8. Valves are provided on them. The gas supplied through the first air supply line 7 can press the original liquid in the cylinder 1 into the residual liquid return line 8. After all the original liquid in the cylinder 1 is pressed out, the cleaning line 6 can be opened and moved from the inside of the filter element to the outside of the filter element to remove impurities and filter cakes on the filter element. The cleaning liquid carrying impurities is discharged from the solid discharge port to realize the regeneration of the filter element. Since there is no original liquid in the cylinder 1 at this time, the waste of original liquid is greatly reduced, and original liquid resources are saved. At the same time, since the cleaning liquid moves from the inside to the outside, the outside of the filter cake outside the filter element is not supported by the pressure of the original liquid, the filter cake is easier to be removed, and the regeneration effect of the filter element is improved.

[0033] The end of the residual liquid return pipeline 8 can be connected to the raw liquid tank, and the pressed back raw liquid is collected by the raw liquid tank for continued filtration and use next time. The raw liquid tank is a tank body that provides raw liquid to the liquid inlet pipeline 4.

[0034] In order to improve the pressure return effect of the original liquid, the liquid inlet of the residual liquid return pipeline 8 should be set close to the bottom of the inner cavity of the cylinder 1.

[0035] The bottom of the inner cavity of the cylinder 1 is connected to a second air supply line 9, and the top of the cylinder 1 is provided with a third air supply line 10 connected to the filter element and an exhaust line 2 for exhaust. Valves are provided on the second air supply line 9, the exhaust line 2 and the third air supply line 10. The cooperation of the second air supply line 9 and the exhaust line 2 realizes the circulation of gas in the cylinder 1, and realizes the drying and solidification of the filter cake. At this time, the viscosity of the filter cake is reduced due to lack of moisture. The gas from the third air supply line 10 is blown from the inside of the filter element to the outside to blow off the filter cake and impurities in the filter element, thereby improving the regeneration effect of the filter element. At the same time, the liquid content of the debris discharged from the solid discharge port is low, which improves the convenience of its cleaning and the convenience of subsequent sewage treatment.

[0036] The air inlet end of the second air supply pipeline 9 and the air inlet end of the first air supply pipeline 7 are connected to a low-pressure pipeline, and the low-pressure pipeline is connected to the air outlet end of the compressed gas supply equipment. A first regulating valve for regulating pressure is provided on the high-pressure pipeline, and a second regulating valve for regulating pressure is provided on the low-pressure pipeline.

[0037] On the basis of setting the first pressure regulating valve and the second pressure regulating valve, the air inlet end of the third air supply pipeline 10 and the air inlet end of the low-pressure pipeline are connected to the main air supply pipeline, and the main air supply pipeline is connected to the air outlet end of the compressed gas supply equipment.

[0038] The bottom of the inner cavity of the cylinder 1 is connected to a third air supply pipeline, and the top of the cylinder 1 is provided with a residual liquid outlet pipeline 11. The liquid inlet of the residual liquid outlet pipeline 11 is located at the bottom of the inner cavity of the filter element. The cooperation of the third air supply pipeline and the residual liquid outlet pipeline 11 can discharge the residual liquid in the filter element, avoid affecting the original liquid to be filtered next time, and improve the filtering effect of the original liquid.

[0039] The third air supply pipeline and the second air supply pipeline 9 are the same pipeline, which saves the number of pipelines and the number of holes punched at the bottom of the cylinder 1, thereby saving costs.

[0040] The liquid outlet ends of multiple filter elements are connected to a collecting pipeline, which collects the filtered liquid of multiple filter elements and discharges it. The liquid outlet pipeline 5, cleaning pipeline 6 and third air supply pipeline 10 of the cylinder 1 are all connected to the filter elements through the liquid outlet of the collecting pipeline of several filter elements. The specific liquid outlet pipeline 5, cleaning pipeline 6, third air supply pipeline 10 and collecting pipeline are connected through a four-way connection.

[0041] In order to reduce the need to drill holes in the bottom of the cylinder 1 , the residual liquid return line 8 and the liquid inlet line 4 are connected to the bottom of the inner cavity of the cylinder 1 through a connecting pipe.

[0042] In this embodiment, the liquid inlet pipeline 4 of the cylinder 1, the liquid outlet pipeline 5 of the cylinder 1, the cleaning pipeline 6, the first air supply pipeline 7, the residual liquid return pipeline 8, the second air supply pipeline 9 and the valves on the exhaust pipeline 2 and the first regulating valve and the second regulating valve can all be electric or pneumatic control valves. Each valve is electrically connected to the control system, and each valve is controlled by the control system to improve the degree of automation of the system.

[0043] The present invention also provides a method for filtering and regenerating the above-mentioned residual liquid filter cartridge, comprising the following steps:

[0044] S1: The control system stops the liquid inlet line 4 and opens the residual liquid return line 8 and the first air supply line 7. Gas enters the cylinder 1 and occupies the space inside the cylinder 1. The raw liquid in the cylinder 1 is squeezed out from the residual liquid return line 8 and collected for the next filtration.

[0045] S2: After the original pressure is discharged, the control system controls the closing of the residual pressure return pipeline 8 and the first air supply pipeline 7, and opens the second air supply pipeline 9 and the exhaust pipeline 2. When the gas moves from bottom to top, it passes through the location of the filter element and blows the filter cake solid through the air flow;

[0046] S3: After the filter cake is blown solid, the control system controls the closing of the second air supply pipeline 9 and the exhaust pipeline 2, and opens the third air supply pipeline 10 and the solid discharge valve 3. The gas is blown from the filter element into the cylinder 1 in the opposite direction of the flow of the filtrate to realize backblowing. During the backblowing process, the filter cake and impurities in the filter element are blown off and discharged from the solid discharge port.

[0047] S4: After the filter cake is discharged, the control system controls the closing of the third air supply pipeline 10 and the opening of the cleaning pipeline 6. The cleaning liquid flows from the filter element into the cylinder 1 in the opposite direction of the flow of the filtered liquid, achieving backwashing to clean the residual impurities in the filter membrane of the filter element;

[0048] S5: After cleaning is completed, the control system controls the closing of the solid discharge valve 3 and the cleaning pipeline 6, opens the third air supply pipeline and the residual liquid outlet pipeline 11, and the gas enters the inner cavity of the filter element from the cylinder 1. As the gas in the inner cavity of the filter element increases, the residual liquid in the filter element is pressed out of the filter element, thereby achieving the discharge of the residual liquid in the filter element.

[0049] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0050] It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0051] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A filter cartridge with no residual liquid, characterized in that: It includes a cylinder and a filter element, the filter element is vertically arranged in the cylinder, a solid discharge port and a liquid inlet pipeline are provided at the bottom of the cylinder, a liquid outlet pipeline connected to the filter element and a cleaning pipeline connected to the filter element are provided at the top, a solid discharge valve is provided at the solid discharge port, the top of the inner cavity of the cylinder is connected to the first air supply pipeline, the bottom of the inner cavity of the cylinder is connected to the residual liquid return pipeline, and valves are provided on the liquid inlet pipeline, the liquid outlet pipeline, the cleaning pipeline, the first air supply pipeline and the residual liquid return pipeline.

2. The zero-residue filter cartridge according to claim 1, characterized in that: The bottom of the inner cavity of the cylinder is connected to a second air supply pipeline, and the top of the cylinder is provided with a third air supply pipeline connected to the filter element and an exhaust pipeline for exhaust. Valves are provided on the second air supply pipeline, the exhaust pipeline and the third air supply pipeline.

3. The zero-residue filter cartridge according to claim 2, characterized in that: The third gas supply pipeline is provided with a first regulating valve for regulating pressure.

4. The zero-residue filter cartridge according to claim 2, characterized in that: The air inlet end of the second air supply pipeline and the air inlet end of the first air supply pipeline are connected to a low-pressure pipeline, the low-pressure pipeline is connected to the air outlet end of the compressor, and a second regulating valve for regulating pressure is provided on the low-pressure pipeline.

5. The zero-residue filter cartridge according to claim 4, characterized in that: The air inlet end of the third air supply pipeline and the air inlet end of the low-pressure pipeline are connected to the main air supply pipeline, and the main air supply pipeline is connected to the air outlet end of the compressed gas supply equipment.

6. The zero-residue filter cartridge according to claim 2, characterized in that: The bottom of the inner cavity of the cylinder is connected to a third air supply pipeline, and the top of the cylinder is provided with a residual liquid outlet pipeline, and the liquid inlet of the residual liquid outlet pipeline is located at the bottom of the inner cavity of the filter element.

7. The zero-residue filter cartridge according to claim 6, characterized in that: The third air supply pipeline and the second air supply pipeline are the same pipeline.

8. The zero-residue filter cartridge according to claim 2, characterized in that: The liquid outlet pipeline, the cleaning pipeline and the third air supply pipeline are all connected to the filter element through the liquid outlet of the aggregation pipeline of several filter elements.

9. The zero-residue filter cartridge according to claim 1, characterized in that: The residual liquid return pipeline and the liquid inlet pipeline are connected to the bottom of the inner cavity of the cylinder through a connecting pipe.

10. A method for filtering and regenerating a filter cartridge without residual liquid as claimed in claim 6, characterized in that: The following steps are involved: S1: Stop the liquid inlet line, open the pressure return line and the first low-pressure air supply line, and the original liquid in the cylinder is pressed out; S2: After the original pressure is discharged, the pressure return pipeline and the first low-pressure air supply pipeline are closed, and the second low-pressure air supply pipeline and the exhaust pipeline are opened to blow and solidify the filter cake; S3: After the blowing is completed, close the second low-pressure air supply pipeline and the exhaust pipeline, open the high-pressure air supply pipeline and the drain valve, and blow the filter cake out; S4: After the filter cake is discharged, close the high-pressure air supply pipeline and open the cleaning pipeline to clean the remaining impurities; S5: After cleaning is completed, close the drain valve and the cleaning pipeline, open the third air supply pipeline and the residual liquid outlet pipeline, and drain the residual liquid in the filter element.

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