Solid-liquid separation type diatomite filter system

Abstract

This utility model discloses a solid-liquid separation diatomaceous earth filtration system, relating to the field of filtration technology. It includes: a coating tank for storing a liquid mixed with diatomaceous earth, a coating circulation pipeline, and a raw liquid tank, a delivery pump, a filter cartridge, and a purified liquid tank connected in sequence. The filter cartridge is vertically arranged inside the cartridge. A drain port and a liquid inlet pipeline are provided at the bottom of the cartridge, and an outlet pipeline and a cleaning pipeline, both connected to the filter cartridge, are provided at the top. A drain valve is provided at the drain port. The top of the inner cavity of the cartridge is connected to a first air supply pipeline, and the bottom of the inner cavity is connected to a pressure return pipeline. The bottom of the coating tank is connected to the liquid inlet channel of the cartridge via a circulation pump. One end of the coating circulation pipeline is located inside the coating tank, and the other end is connected to the filter cartridge. In this utility model, the filter cartridge is coated with soil using the coating tank. Gas supplied through the first air supply pipeline forces the raw liquid inside the cartridge into the pressure return pipeline, saving raw liquid resources and improving the regeneration effect of the filter cartridge.

Description

Technical Field

[0001] This utility model relates to the field of filtration technology, and in particular to a solid-liquid separation diatomaceous earth filtration system. Background Technology

[0002] With the rapid development and application of advanced technologies, the requirements for fluids in both daily life and industrial production are becoming increasingly stringent. When faced with fluids that are highly viscous, contain flocculent impurities, or are prone to clogging, making continuous filtration impossible, diatomaceous earth filters are needed. Diatomaceous earth forms a filter cake on the outside of the filter membrane, thus assisting in the filtration of the fluid. However, the filter cartridges will gradually become clogged with impurities during use and will no longer be able to work. Discarding the unusable filter cartridges and replacing them with new ones would result in a significant investment in consumables.

[0003] In order to solve the problem of filter element clogging, the existing technology often adopts backwashing regeneration. Specifically, gas or liquid is used as the cleaning fluid. The cleaning fluid enters from the liquid outlet of the filter element. The cleaning fluid flows in the opposite direction to the filtrate, thereby flushing out the impurities clogging the filter element and discharging them from the solid discharge port at the bottom of the filter. However, during the solid discharge process, the cleaning fluid is discharged together with the original liquid and impurities in the filter, resulting in the waste of the original liquid.

[0004] Therefore, there is an urgent need for a solid-liquid separation diatomaceous earth filtration system that has good regeneration effect and saves raw liquid resources. Utility Model Content

[0005] The purpose of this invention is to provide a solid-liquid separation diatomaceous earth filtration system to solve the problems existing in the prior art. Before solid discharge, the original liquid in the cylinder is pumped out by the air supply of the first air supply pipeline, which reduces the waste of the original liquid during the solid discharge process and improves the regeneration effect. At the same time, the filter element is pre-coated to form a filter cake before filtration, which improves the filtration effect.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a solid-liquid separation diatomaceous earth filtration system, comprising a raw liquid tank, a delivery pump, at least one filter cartridge, and a purified liquid tank connected in sequence. The filter cartridge includes a cylinder body and a filter element. The filter element is vertically arranged inside the cylinder body. The bottom of the cylinder body is provided with a solid discharge port and a liquid inlet pipe. The top of the cylinder body is provided with a liquid outlet pipe and a cleaning pipe connected to the filter element. A solid discharge valve is provided at the solid discharge port. The top of the inner cavity of the cylinder body is connected to a first air supply pipe. The bottom of the inner cavity of the cylinder body is connected to a pressure return pipe. Valves are provided on the liquid inlet pipe, the liquid outlet pipe, the cleaning pipe, the first air supply pipe, and the pressure return pipe of the cylinder body.

[0007] When multiple filter cartridges are provided, the multiple filter cartridges are arranged in parallel;

[0008] It also includes a coating tank for storing liquid mixed with diatomaceous earth and a coating circulation pipeline. The bottom of the coating tank is connected to the liquid inlet channel of the cylinder through a circulation pump and a valve. One end of the coating circulation pipeline is located inside the coating tank, and the other end is connected to the filter element. A valve is provided on the coating circulation pipeline.

[0009] Preferably, the diatomaceous earth filtration system further includes a filling tank for storing filter aid, the filling tank being connected to the liquid inlet pipeline of the cylinder via a metering pump.

[0010] Preferably, the solid-liquid separation diatomaceous earth filtration system further includes a cross-flow tank and a cross-flow pipeline. The bottom of the cross-flow tank is connected to the front end pipeline of the delivery pump via a valve. One end of the cross-flow pipeline is located at the bottom of the inner cavity of the cross-flow tank, and the other end is connected to the top of the inner cavity of the cylinder. A valve is provided at the front end of the cross-flow tank where it connects to the front end pipeline of the delivery pump, and a valve is provided on the cross-flow pipeline.

[0011] Preferably, the bottom of the inner cavity of the cylinder is connected to a second air supply pipe, and the top of the cylinder is provided with a third air supply pipe connected to the filter element. Both the second air supply pipe and the third air supply pipe are equipped with valves.

[0012] Preferably, the first gas supply line and the second gas supply line share a common gas supply line 1. Both the first gas supply line 1 and the third gas supply line 3 are equipped with pressure regulating valves for controlling pressure. Both the first gas supply line 1 and the third gas supply line 3 are connected to a compressed gas supply device.

[0013] Preferably, a residual liquid outlet pipe is provided at the top of the cylinder, with the inlet of the residual liquid outlet pipe located at the bottom of the inner cavity of the filter element and the outlet located outside the cylinder.

[0014] Preferably, the purified liquid tank is connected to the cleaning pipeline, and the outlet of the residual liquid outlet pipeline is connected to the original liquid tank.

[0015] Preferably, the filter cartridge is connected to the purified liquid tank via a precision filter.

[0016] Preferably, the purification liquid tank is connected to the cleaning pipeline and the outlet pipeline of the precision filter via a pump and a filter, respectively.

[0017] Preferably, the bottom of the purified liquid tank is provided with a discharge pipe, and the discharge pipe is equipped with a purified liquid transfer pump and a valve body. The purified liquid transfer pump and the valve body of the discharge pipe are both electrically connected to the control system.

[0018] The present invention achieves the following main technical effects compared to the prior art:

[0019] By circulating the liquid in the coating tank to the filter cartridge, a diatomaceous earth filter cake forms on the outside of the filter membrane as the filter cartridge filters the liquid in the coating tank. This effectively improves the filtration effect, making it suitable for filtering liquids with high viscosity and many impurities. In addition, the gas supplied through the first air supply line can force the original liquid in the cartridge back into the line. After all the original liquid in the cartridge has been forced out, the cleaning line can be opened, and the cleaning fluid moves from the inside to the outside of the filter cartridge to remove impurities. The cleaning fluid carrying impurities is discharged from the discharge port, realizing the regeneration of the filter cartridge. Since there is no original liquid in the cartridge at this time, the waste of original liquid is greatly reduced, saving original liquid resources. At the same time, as the cleaning fluid moves from the inside to the outside, the outer side of the filter cake is not supported by the pressure of the original liquid, making the filter cake easier to remove and improving the regeneration effect of the filter cartridge.

[0020] Compared with the prior art, the other technical solutions of this utility model have also achieved the following technical effects:

[0021] After the raw liquid is squeezed out of the cylinder, the second air supply line and the exhaust line work together to allow gas to circulate in the cylinder and solidify the filter cake. At this time, the filter cake becomes less sticky due to lack of moisture. The gas from the third air supply line blows air from the inside of the filter element to the outside, blowing off the filter cake and impurities in the filter element, improving the regeneration effect of the filter element. At the same time, the impurities discharged from the discharge port have a low water content, which improves the ease of cleaning and the ease of subsequent sludge treatment.

[0022] The filtered purified liquid is used as the cleaning liquid. The cleaning liquid does not need to be discharged; it can be directly pressed back into the original liquid tank. There is no need to consider the impact of the residual liquid in the filter element after cleaning on the subsequent filtrate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a system diagram of the automatic diatomaceous earth filtration system in an embodiment of this utility model;

[0025] The components include: 1. Raw material tank; 2. Cross-flow tank; 3. Filter cartridge; 4. Precision filter; 5. Purified liquid tank; 6. Solid discharge port; 7. Cleaning pipeline; 8. First air supply pipeline; 9. Pressure return pipeline; 10. Discharge pipeline; 11. Cross-flow pipeline; 12. Second air supply pipeline; 13. Third air supply pipeline; 14. Residual liquid discharge pipeline; 15. Soil coating tank; and 16. Filling tank. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The purpose of this utility model is to provide a solid-liquid separation diatomaceous earth filtration system to solve the problems existing in the prior art. Before solid discharge, the original liquid in the cylinder is pumped out by the air supply of the first air supply pipeline, which reduces the waste of the original liquid during the solid discharge process and improves the regeneration effect. At the same time, before filtration, the filter element is coated with soil to form a filter cake and diatomaceous earth is added.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Please refer to the following: Figure 1As shown, a solid-liquid separation diatomaceous earth filtration system is provided, comprising a raw liquid tank 1, a transfer pump, at least one filter cartridge 3, and a purified liquid tank 5 connected in sequence. The filter cartridge 3 includes a cylinder body and a filter element, with the filter element vertically arranged inside the cylinder body. A solid discharge port 6 and a liquid inlet pipe are provided at the bottom of the cylinder body, and an outlet pipe 2 and a cleaning pipe 7 connected to the filter element are provided at the top. A solid discharge valve is provided at the solid discharge port 6. The top of the inner cavity of the cylinder body is connected to a first air supply pipe 8, and the bottom of the inner cavity of the cylinder body is connected to a pressure return pipe 9. Valves are provided on the inlet pipe, outlet pipe, cleaning pipe 7, first air supply pipe 8, and pressure return pipe 9 of the cylinder body. The system also includes a coating tank 15 for holding a liquid mixed with diatomaceous earth and a coating circulation pipe. The bottom of the coating tank 15 is connected to the liquid inlet channel of the cylinder body through a circulation pump and a valve. One end of the coating circulation pipe is located inside the coating tank 15, and the other end is connected to the filter element. The system is equipped with valves and operates as follows: Liquid in the coating tank 15 is circulated to the filter cartridge 3. As the filter cartridge circulates the liquid in the coating tank 15, a diatomaceous earth filter cake forms on the outside of the filter cartridge, effectively improving the filtration effect and making it suitable for filtering liquids with high viscosity and many impurities. Additionally, the gas supplied through the first air supply line 8 can force the original liquid in the cartridge back into the line 9. After all the original liquid in the cartridge is expelled, the cleaning line 7 is opened, allowing the liquid to move from the inside to the outside of the filter cartridge, cleaning away impurities. The cleaning liquid carrying impurities is discharged from the drain port 6, regenerating the filter cartridge. Since there is no original liquid in the cartridge at this time, waste of original liquid is greatly reduced, saving resources. Furthermore, because the cleaning liquid moves from the inside to the outside without the pressure of the original liquid supporting it, the filter cartridge is easier to clean, improving the regeneration effect. After each regeneration, the filter cartridge needs to be recoated with coating.

[0030] A liquid level sensor is installed at the bottom of the inner cavity of the coating tank 15. When the liquid level is low, it will remind the staff to add diatomaceous earth and replenish the liquid. The liquid mixed with the diatomaceous earth can be the filtered purified raw liquid.

[0031] The solid-liquid separation diatomaceous earth filtration system also includes a filling tank 16 for storing filter aids. The filling tank 16 is connected to the liquid inlet pipe of the cylinder through a metering pump. For example, when there are more colloids or impurities in the raw liquid, the amount of diatomaceous earth added to the filling tank 16 is increased to meet the filtration requirements.

[0032] The solid-liquid separation diatomaceous earth filtration system also includes a cross-flow tank 2 and a cross-flow pipeline 11. The bottom of the cross-flow tank 2 is connected to the front end of the delivery pump pipeline via a valve. One end of the cross-flow pipeline 11 is located at the bottom of the inner cavity of the cross-flow tank 2, and the other end is connected to the top of the inner cavity of the cylinder. A valve is installed at the front end of the connection between the cross-flow tank 2 and the front end of the delivery pump pipeline. A valve is also installed on the cross-flow pipeline 11. Before filtration, the cross-flow pipeline 11 is opened and the bottom valve of the cross-flow tank 2 is closed. The delivery pump supplies the raw liquid from the raw liquid tank 1 into the cylinder and into the cross-flow tank 2 through the cross-flow pipeline 11. After the cross-flow tank 2 stores a certain amount of raw liquid, the valve at the front end of the connection between the cross-flow tank 2 and the front end of the delivery pump pipeline is closed, the bottom valve of the cross-flow tank 2 is opened, and the valve on the cross-flow pipeline 11 is closed. The cross-flow tank 2 serves as the tank for supplying the raw liquid and acts as a buffer tank.

[0033] A liquid level sensor for detecting the current liquid level is installed at the bottom of the inner cavity of the cross-flow tank 2, and a tuning fork liquid level switch is installed at the top of the inner cavity. When the liquid level submerges the tuning fork liquid level switch, the control system receives a signal to close the valve at the front end of the pipeline connecting the cross-flow tank 2 and the front end of the delivery pump, opens the bottom valve of the cross-flow tank 2, and closes the valve on the cross-flow pipeline 11. At this time, the cross-flow tank 2 supplies raw liquid to the filter cartridge 3. When the liquid level reaches the liquid level sensor, the control system receives a signal to close the bottom valve of the cross-flow tank 2 and open the cross-flow pipeline 11. The raw liquid in the raw liquid tank 1 flows through the filter cartridge 3 through the delivery pump and enters the cross-flow tank 2 through the cross-flow pipeline 11, thus circulating.

[0034] The bottom of the inner cavity of the cylinder is connected to a second air supply pipe 12, and the top of the cylinder is provided with a third air supply pipe 13 connected to the filter element. Valves are provided on both the second air supply pipe 12 and the third air supply pipe 13. The cooperation of the second air supply pipe 12 and the exhaust pipe enables the flow of gas in the cylinder to solidify the filter cake. At this time, the filter cake has reduced viscosity due to lack of moisture. The gas from the third air supply pipe 13 blows air from the inside of the filter element to the outside, blowing off the filter cake and impurities in the filter element, improving the regeneration effect of the filter element. At the same time, the impurities discharged from the solid discharge port 6 have a low moisture content, which is conducive to the convenience of subsequent solids treatment.

[0035] The first air supply line 8 and the second air supply line 12 share a main air supply line. Both the first air supply line 8 and the third air supply line 13 are equipped with pressure regulating valves for controlling pressure. Both the first air supply line 8 and the third air supply line 13 are connected to the compressed gas supply equipment through the main air supply line. The compressed gas can be provided by an air compressor.

[0036] Branches are provided on the first air supply line 8 and the third air supply line 13 to connect with the liquid outlet of the precision filter 4, so that the precision filter 4 can be regenerated by backflushing. Valves are provided on the branches.

[0037] A filter can be installed at the air inlet of the main air supply line to improve the cleanliness of the compressed gas.

[0038] An air storage tank is installed between the main gas supply pipeline and the compressed gas supply equipment to act as a buffer.

[0039] The top of the cylinder is equipped with a residual liquid outlet pipe 14. The inlet of the residual liquid outlet pipe 14 is located at the bottom of the inner cavity of the filter element, and the outlet is located outside the cylinder. The cooperation between the second air supply pipe 12 and the residual liquid outlet pipe 14 can export the residual liquid inside the filter element. After the machine is stopped or after cleaning with cleaning fluid, it can be ensured that no liquid remains inside the filter element.

[0040] The purification liquid tank 5 is connected to the cleaning pipeline 7, so that the raw liquid is used as the cleaning liquid. The power for the cleaning liquid comes from the delivery pump. In this way, there is no need to consider the impact of the residual liquid in the filter element on the subsequent filtrate after cleaning. After the machine is stopped, the residual liquid in the filter element is discharged using the residual liquid discharge pipeline 14 and the second air supply pipeline 12 to avoid waste of raw liquid. Based on using raw liquid as the cleaning liquid, the outlet of the residual liquid discharge pipeline 14 can be connected to the raw liquid tank 1 to import the residual raw liquid into the raw liquid tank 1 for later use. If a cross-flow tank 2 is set, the outlet of the residual liquid discharge pipeline 14 can be connected to the cross-flow tank 2.

[0041] The residual liquid outlet pipe 14 and the soil circulation pipe can share a connecting pipe to the filter element.

[0042] The filter cartridge 3 is connected to the purified liquid tank 5 through the precision filter 4, which is equivalent to filtering the raw liquid using a secondary filtration method.

[0043] The pipeline between the precision filter 4 and the purification liquid tank 5 is connected to the cleaning pipeline 7. Valves are installed on the connecting pipeline between the precision filter 4 and the cleaning pipeline 7, as well as on the connecting pipeline between the precision filter 4 and the purification liquid tank 5. The opening and closing of the relevant pipelines can be controlled by controlling the opening and closing of the valves.

[0044] The purification liquid tank 5 is connected to the cleaning pipeline 7 and the outlet pipeline of the precision filter 4 through the pump body and the filter respectively. The pump body and the filter are designed so that the whole system can perform a major wash periodically. That is, the pump body and the filter are used to pump the filtrate in the purification liquid tank 5 to the precision filter 4 and the filter cartridge 3, and the filter elements of both are simultaneously backwashed.

[0045] The bottom of the purified liquid tank 5 is equipped with a discharge pipe 10, on which a purified liquid transfer pump and a valve body are installed. A liquid level sensor is installed at the bottom of the inner cavity of the purified liquid tank 5, and a liquid level switch is installed at the top of the inner cavity. The purified liquid transfer pump, the valve body of the discharge pipe 10, the liquid level sensor, and the tuning fork liquid level switch are all electrically connected to the control system. When the liquid level submerges the tuning fork liquid level switch, the control system receives a signal to open the purified liquid transfer pump and the valve body of the discharge pipe 10. At this time, the purified liquid in the purified liquid tank 5 is discharged and collected, and then transferred to the subsequent processing steps. When the liquid level reaches the liquid level sensor, the control system receives a signal to close the purified liquid transfer pump and the valve body of the discharge pipe 10, stopping the continued discharge of purified liquid, and this cycle continues.

[0046] When the cross-flow tank 2 is installed, the pressure return pipeline 9 can be connected to the cross-flow tank 2. The pressure-returned raw liquid enters the cross-flow tank 2 and is stored. At the same time, in order to improve the pressure return effect of the raw liquid, the inlet of the pressure return pipeline 9 should be set close to the bottom of the inner cavity of the cylinder.

[0047] The liquid outlets of multiple filter elements inside the cylinder are connected to a main pipe, which collects the filtrate from multiple filter elements and discharges it. The liquid outlet pipe, cleaning pipe 7, and third air supply pipe 13 of the cylinder are all connected to the filter elements through the liquid outlet of the main pipe of several filter elements. The specific liquid outlet pipe, cleaning pipe 7, third air supply pipe 13, and main pipe are connected by a four-way connector.

[0048] To reduce the need for drilling at the bottom of the cylinder, the pushback line 9 and the liquid inlet line are connected to the bottom of the inner cavity of the cylinder through a connecting pipe.

[0049] In this embodiment, several filter cartridges 3 are connected in parallel between the delivery pump and the precision filter 4. The multiple filter cartridges 3 work alternately or synchronously. When a filter cartridge 3 is being regenerated, other filter cartridges 3 need to be in working state to improve the working efficiency of the system. When multiple filter cartridges 3 are connected in parallel, since the filtered raw liquid continuously enters the precision filter 4 and then enters the purified liquid tank 5 from the precision filter 4, there is no need to set a delivery pump on the cleaning pipeline 7. The power is provided by the delivery pump at the front end of the filter cartridge 3 in working state (the valve between the precision filter 4 and the purified liquid tank 5 needs to be closed; when only one filter cartridge 3 or multiple filter cartridges 3 are set in parallel, a delivery pump needs to be set on the cleaning pipeline 7 to provide power).

[0050] The liquid outlet pipe of the cylinder and the liquid outlet pipe of the precision filter 4 are both connected to the cross-flow tank 2 through branch pipes, which are used to re-supply the filtered liquid into the cross-flow tank 2 for repeated filtration to improve the filtration effect. Valves are installed on the branch pipes.

[0051] The outlet pipe of the purified liquid tank 5 is connected to the original liquid tank 1 via a branch pipe, so that the purified liquid can be re-supplied into the original liquid tank 1 for further filtration.

[0052] A flow meter is installed on the liquid outlet pipe of the cylinder to detect the flow rate in real time. When the flow rate decreases, it indicates that the filter element in the cylinder is clogged. A flow meter is also installed on the liquid outlet pipe of the purified liquid tank 5 to detect the total liquid flow rate.

[0053] In this system, all valves are controlled by the control system, which improves the system's level of automation.

[0054] In actual use, the raw liquid in the raw liquid tank is first transported to the cross-flow tank for storage by a transfer pump. When the cross-flow tank reaches a certain storage level, the transfer pump feeds the raw liquid into the cylinder of the cross-flow tank. The raw liquid then passes through the filter element and the precision filter in sequence before entering the purified liquid tank for storage. Before filtration, the filter element needs to be regenerated by starting the circulation pump to supply the liquid in the coating tank 15 to form a filter cake. The filter element regeneration requires the following steps:

[0055] S1: The control system stops the liquid inlet of the liquid inlet pipeline, opens the pressure return pipeline 9 and the first gas supply pipeline 8, and the gas enters the cylinder and occupies the space inside the cylinder. The raw liquid inside the cylinder is forced out from the pressure return pipeline 9 and enters the cross-flow tank. The pressed-out raw liquid is collected and waits for the next filtration.

[0056] S2: After the original hydraulic output is completed, the control system closes the pressure return line 9 and the first air supply line 8, and opens the second air supply line 12 and the exhaust line. When the gas moves from bottom to top, it passes the location of the filter element and blows the filter cake solid by airflow.

[0057] S3: After the filter cake is blown off, close the second air supply line 12 and the exhaust line, and open the third air supply line 13 and the discharge valve to blow the filter cake off.

[0058] S4: After the filter cake is discharged, close the third air supply line 13 and the solid discharge valve, open the cleaning line and the pressure return line 9, and the raw liquid flows from the filter element into the cylinder in the opposite direction to the flow of the filtrate to achieve backwashing and clean the residual impurities in the filter membrane of the filter element.

[0059] If the system needs to be shut down later, after cleaning in step S4, close the cleaning pipeline and open the first air supply pipeline 8. The original liquid in the cylinder is forced out into the cross-flow tank. After the original liquid is discharged, close the first air supply pipeline 8 and the return pipeline 9, and open the second air supply pipeline 12 and the residual liquid outlet pipeline 14. Gas enters the filter element cavity from the cylinder. As the gas in the filter element cavity increases, the residual liquid in the filter element is forced out from the filter element, thus exporting the residual liquid in the filter element to the cross-flow tank.

[0060] If filtration is required again after regeneration, the filter element needs to be pre-coated with soil.

[0061] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0062] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A solid-liquid separation diatomaceous earth filtration system, characterized in that, The system includes a raw liquid tank, a transfer pump, at least one filter cartridge, and a purified liquid tank connected in sequence. The filter cartridge includes a cylinder body and a filter element. The filter element is vertically arranged inside the cylinder body. The bottom of the cylinder body has a solid discharge port and a liquid inlet pipe. The top of the cylinder body has a liquid outlet pipe and a cleaning pipe connected to the filter element. A solid discharge valve is provided at the solid discharge port. The top of the inner cavity of the cylinder body is connected to a first air supply pipe. The bottom of the inner cavity of the cylinder body is connected to a pressure return pipe. Valves are provided on the liquid inlet pipe, the liquid outlet pipe, the cleaning pipe, the first air supply pipe, and the pressure return pipe of the cylinder body. When multiple filter cartridges are provided, the multiple filter cartridges are arranged in parallel; It also includes a coating tank for storing liquid mixed with diatomaceous earth and a coating circulation pipeline. The bottom of the coating tank is connected to the liquid inlet channel of the cylinder through a circulation pump and a valve. One end of the coating circulation pipeline is located inside the coating tank, and the other end is connected to the filter element. A valve is provided on the coating circulation pipeline.

2. The solid-liquid separation diatomaceous earth filtration system according to claim 1, characterized in that, The diatomaceous earth filtration system also includes a filling tank for storing filter aids, which is connected to the liquid inlet pipeline of the cylinder via a metering pump.

3. The solid-liquid separation diatomaceous earth filtration system according to claim 1, characterized in that, The solid-liquid separation diatomaceous earth filtration system also includes a cross-flow tank and a cross-flow pipeline. The bottom of the cross-flow tank is connected to the front end pipeline of the delivery pump through a valve. One end of the cross-flow pipeline is located at the bottom of the inner cavity of the cross-flow tank, and the other end is connected to the top of the inner cavity of the cylinder. A valve is provided at the front end of the cross-flow tank where it connects to the front end pipeline of the delivery pump, and a valve is provided on the cross-flow pipeline.

4. The solid-liquid separation diatomaceous earth filtration system according to claim 3, characterized in that, The bottom of the inner cavity of the cylinder is connected to a second air supply pipe, and the top of the cylinder is provided with a third air supply pipe connected to the filter element. Both the second air supply pipe and the third air supply pipe are equipped with valves.

5. The solid-liquid separation diatomaceous earth filtration system according to claim 4, characterized in that, The first gas supply line and the second gas supply line share a single gas supply line. Both the first gas supply line and the third gas supply line are equipped with pressure regulating valves for controlling pressure. Both the first gas supply line and the third gas supply line are connected to a compressed gas supply device.

6. The solid-liquid separation diatomaceous earth filtration system according to claim 4, characterized in that, The top of the cylinder is provided with a residual liquid outlet pipe. The inlet of the residual liquid outlet pipe is located at the bottom of the inner cavity of the filter element, and the outlet is located outside the cylinder.

7. The solid-liquid separation diatomaceous earth filtration system according to claim 6, characterized in that, The purified liquid tank is connected to the cleaning pipeline, and the outlet of the residual liquid outlet pipeline is connected to the original liquid tank.

8. The solid-liquid separation diatomaceous earth filtration system according to claim 1, characterized in that, The filter cartridge is connected to the purified liquid tank via a precision filter.

9. The solid-liquid separation diatomaceous earth filtration system according to claim 8, characterized in that, The purification liquid tank is connected to the cleaning pipeline and the outlet pipeline of the precision filter via a pump and a filter, respectively.

10. The solid-liquid separation diatomaceous earth filtration system according to claim 1, characterized in that, The bottom of the purified liquid tank is equipped with a discharge pipe, and the discharge pipe is equipped with a purified liquid delivery pump and a valve body. The purified liquid delivery pump and the valve body of the discharge pipe are both electrically connected to the control system.

Images