Online automatic cleaning system for filter element

Abstract

The invention discloses an on-line automatic cleaning system for a filter element, which is characterized in that filtered fluid in a water tank of filtering equipment is pumped into a filtering part of the equipment, and the fluid is injected from a core part of the filter element and flows out from the surface of the filter element through reverse engineering of a filtering mode; and then compressed air is injected to empty the fluid in the tank body containing the filter elements and on each filter element in the tank, and the cleaning of the filter elements is realized after the operation is repeated for several times. A digital flow monitor is arranged on a filtering tank to monitor the filtering flow of each group of filtering tanks in real time, a flow value is uploaded to a PLC (Programmable Logic Controller) control end of equipment, a real-time flow curve is formed, after the equipment finishes each round of back flushing cleaning, a system can record the filtering tank group with the flow lower than a flow set threshold value, and the filtering tank group with the flow lower than the flow set threshold value is recorded in real time. And the filtering capacity of the equipment is kept above a set threshold value for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of filtration cleaning, and in particular to an online automatic cleaning system for a filter element. Background Art

[0002] The filter element is the core part of the filter element type filtering equipment. The current cleaning method of the paper filter element is to use the back-blowing function of the filtering equipment itself, and use compressed air to discharge the filter residue on the paper filter element together with the filtrate. For example, the invention with application number 201811134702.3 discloses a self-cleaning air filter, in which a main filter element is arranged in the air filter housing, an air inlet is arranged on the side of the housing, an air outlet is arranged at the upper end of the housing, a pressure air source is connected to the solenoid valve through a pipeline, and the solenoid valve is connected to the safety filter element through a pipeline, and an ash discharge port is arranged at the bottom of the housing. After the pressure airflow passes through the solenoid valve, it is back-blown into the safety filter element. The back-blowing causes the air fluid to instantly generate a strong pressure difference between the inner and outer surfaces of the filter element, forcing the dust and pollutant particles to be dispersed and peeled off from the outer surface of the filter element, and discharged from the air inlet or ash discharge port under the action of the air flow field.

[0003] However, compressed air cannot completely open the gaps between the paper sheets of the paper filter element, resulting in most of the filter residue remaining on the filter element after backwash cleaning, affecting the filtering capacity of the filter element; secondly, the filtering capacity of the filter element cannot be monitored in real time, and the filtering volume cannot be automatically controlled. Manual regular inspections are required, resulting in frequent filter element blockages and reduced purity of the filtered fluid; when the filter element is blocked, the entire blocked part of the filter element needs to be hoisted and processed offline, and then reinstalled after the processing is completed, which increases labor intensity, affects equipment operation, and causes waste of filter element materials. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an online automatic cleaning system for a filter element. The system injects the filtered fluid in the water tank of the filtering equipment into the filtering part of the equipment, and through reverse engineering of the filtering method, injects the fluid from the core of the filter element and flows out from the surface of the filter element. Then, compressed air is injected to empty the fluid in the tank containing the filter element and on each filter element in the tank. After repeated several times, the filter element is cleaned.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an online automatic cleaning system for a filter element, the cleaning system comprising a filtering part composed of a plurality of filter tank groups, a spare cooling pump, a filter equipment water tank, a main cleaning line, a plurality of cleaning branch lines, a cleaning filter tank and a slag collecting part; the spare cooling pump is connected to the filter equipment water tank and the main cleaning line, the main cleaning line is connected to each cleaning branch line, the cleaning branch line is connected to each filter tank group, each filter tank group is connected to the cleaning filter tank through a dirty liquid pipeline, and the cleaning filter tank is respectively connected to the filter equipment water tank and the slag collecting part through pipelines; The cleaning method of the cleaning system is as follows: the clean fluid in the water tank of the filter equipment is injected into the top of the filter tank that needs to be cleaned through the standby cooling pump through the main cleaning pipeline and each cleaning branch pipeline; the clean fluid enters from the core of the filter element in the filter tank and flows out from the surface of the filter element, and the gap between the filter paper of the filter element is opened by utilizing the compression stability of the fluid to completely discharge the filtered impurities; the dirty liquid in the filter tank and on each filter element in the tank is emptied by backblowing compressed air; the dirty liquid enters the cleaning filter tank through the dirty liquid pipeline for filtration treatment and then flows back to the water tank of the filter equipment. Furthermore, each of the filter tank groups is provided with a flow monitor, which is used to monitor the filtration flow of the filter tank group; when the filtering equipment's own backwash cleaning action is completed, the flow of the filter tank group is monitored, and when the monitored flow value is lower than the set flow threshold, the filter tank group stops filtering and starts cleaning.

[0006] Furthermore, each cleaning branch pipeline connected to the filter tank group is provided with a control valve, and clean fluid is introduced into the filter tank that needs to be cleaned through the control valve.

[0007] Furthermore, a plurality of filter elements are evenly arranged in the filter tank, and a blocking mechanism is provided on the top of the filter tank, and the blocking mechanism is arranged above the filter element; the blocking mechanism, the head space of the filter tank, and the core of each filter element together constitute a shower structure, which is used to ensure that the flow rate and pressure value of the clean fluid received by each filter element in the filter tank are uniform.

[0008] Furthermore, the blocking mechanism includes a baffle plate arranged perpendicular to each filter element, and the baffle plate is connected to the top of the filter tank through a plurality of connecting columns.

[0009] Furthermore, a cleaning liquid inlet is provided at the top of the filter tank, and the cleaning liquid inlet is connected to the cleaning branch pipeline; an oil drain port is provided at the bottom of the filter tank, and the oil drain port is connected to the dirty liquid pipeline A, and the other end of the dirty liquid pipeline A is connected to the cleaning filter tank.

[0010] Furthermore, a gas backflush port is provided above the filter tank, and the gas backflush port is used to inject compressed air to clear the dirty liquid remaining in the filter tank and on each filter element.

[0011] Furthermore, the dirty liquid discharge port of the cleaning filter tank is connected to the dirty liquid pipeline B. After the cleaning filter tank is cleaned by the clean fluid in the water tank of the filtering equipment, the dirty liquid enters the slag collecting part through the dirty liquid pipeline B.

[0012] The beneficial effects of the present invention are as follows: compared with the prior art, the online automatic cleaning system for the filter element provided by the present invention can thoroughly clean the filter element. After cleaning, the filtering capacity of the filter element is much greater than the backwash cleaning function of the filtering equipment, and the problem that the filtering capacity of the filter element of the filtering equipment gradually decays with the accumulation of use time is solved, thereby ensuring the long-term stability of the filtering capacity of the filter element; the problem that the filtering equipment cannot monitor and control the filtering capacity in real time is solved, and the online cleaning system is implemented by using the flow value as a trigger to realize automatic closed-loop control of the entire filtering equipment, which completely solves the problems of inaccurate detection, filter tank blockage, and filter element scrapping caused by the original manual inspection method, and reduces the labor intensity of daily manual maintenance; because the filtering capacity of the filter element can be automatically controlled, the filtration purity of the fluid is improved, and the processing quality of workpieces that require fluid cooling processing is directly improved; the generated filtration flow curve can be stored for a long time, providing effective data for troubleshooting of filtering equipment problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional structural diagram of the automatic cleaning system provided by the present invention after compatible assembly with the filtering device.

[0014] Figure 2 This is a side structural diagram of the automatic cleaning system provided by the present invention after compatible assembly with the filtering device.

[0015] Figure 3 A partial structural diagram of the filter tank group in the automatic cleaning system provided by the present invention.

[0016] Figure 4 This is a schematic diagram of the structure of the filter tank in the automatic cleaning system provided by the present invention.

[0017] Figure 5 This is an operation flow chart of the automatic cleaning system provided by the present invention; wherein, the dotted line is the normal operation process of the filtering equipment after adding flow monitoring, and the solid line is the operation process of the filter element online automatic cleaning system.

[0018] Among them, 1-slag collecting part; 2-cleaning filter tank; 3-filter tank group; 301-filter tank; 301-1-blocking mechanism; 301-1-1-connecting column; 301-1-2-baffle; 301-2-filter element; 301-3-gas backflush port; 301-4-oil drain port; 301-5-top of filter tank; 4-standby cooling pump; 5-filter equipment water tank; 6-cleaning branch pipeline; 601-control valve; 7-cleaning main pipeline; 8-dirty liquid pipeline B; 9-dirty liquid pipeline A; 10-flow monitor. DETAILED DESCRIPTION

[0019] The present invention is further described below by specific examples, but these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0020] A filter element online automatic cleaning system, the cleaning system comprising a filtering part consisting of a plurality of filter tank groups 3, a standby cooling pump 4, a filter equipment water tank 5, a main cleaning line 7, a plurality of cleaning branch lines 6, a cleaning filter tank 2 and a slag collecting part 1; the standby cooling pump 4 is connected to the filter equipment water tank 5 and the main cleaning line 7, the main cleaning line 7 is connected to each cleaning branch line 6, the cleaning branch line 6 is connected to each filter tank group 3, each filter tank group 3 is composed of three filter tanks 301, each filter tank group 3 is connected to the cleaning filter tank 2 through a dirty liquid pipeline, and the cleaning filter tank 2 is respectively connected to the filter equipment water tank 5 and the slag collecting part 1 through pipelines; The cleaning method of the cleaning system is as follows: the clean fluid in the water tank 5 of the filter equipment is injected into the top 301-5 of the filter tank to be cleaned through the cleaning main pipeline 7 and each cleaning branch pipeline 6 by the standby cooling pump 4; the clean fluid enters from the core of the filter element 301-2 in the filter tank and flows out from the surface of the filter element 301-2, and the gap between the filter papers of the filter element 301-2 is opened by utilizing the compression stability of the fluid so that the filtered impurities are completely discharged; the dirty liquid in the filter tank 301 and on the filter element 301-2 in the tank is emptied by backblowing compressed air; the dirty liquid enters the cleaning filter tank 2 through the dirty liquid pipeline for filtering and then flows back to the water tank 5 of the filter equipment. Each of the filter tank groups 3 is provided with a flow monitor 10, and the flow monitor 10 is used to monitor the filtering flow of the filter tank group 3; the flow of the filter tank group is monitored after the backwash cleaning action of the filtering equipment is completed. When the monitored flow value is lower than the set flow threshold, the filter tank group 3 stops filtering and starts cleaning.

[0021] Each cleaning branch pipeline 6 connected to the filter tank 301 is provided with a control valve 601, and the clean fluid is introduced into the filter tank 301 that needs to be cleaned through the control valve 601.

[0022] A plurality of filter cartridges 301-2 are evenly arranged in the filter tank 301, and a blocking mechanism 301-1 is provided at the top 301-5 of the filter tank, and the blocking mechanism 301-1 is arranged above the filter cartridge 301-2; the blocking mechanism 301-1, the space at the top 301-5 of the filter tank, and the core of each filter cartridge 301-2 together constitute a shower structure for ensuring that the flow rate and pressure value of the clean fluid received by each filter cartridge 301-2 in the filter tank 301 are uniform.

[0023] The blocking mechanism 301-1 includes a baffle 301-1-2 arranged perpendicular to each filter element, and the baffle is connected to the top 301-5 of the filter tank through a plurality of connecting columns 301-1-1. After the clean fluid enters the top 301-5 of the filter tank, it will first stay in the space of the top 301-5 of the filter tank under the buffering effect of the baffle 301-1-2, and then flow into the core of each filter element 301-2 relatively evenly.

[0024] The top 301-5 of the filter tank is provided with a cleaning liquid inlet, which is connected to the cleaning branch pipeline; the bottom of the filter tank is provided with an oil discharge port 301-4, which is connected to the dirty liquid pipeline A9, and the other end of the dirty liquid pipeline A9 is connected to the cleaning filter tank 2. After the clean fluid enters the filter tank from the top 301-5 of the filter tank, the filter element 301-2 is cleaned, and the dirty liquid generated after cleaning is discharged to the dirty liquid pipeline A9 through the oil discharge port 301-4 at the bottom, and the cleaning dirty liquid enters the cleaning filter tank 2 through the dirty liquid pipeline A9 for further treatment.

[0025] A gas backflush port 301-3 is provided above the filter tank 301, and the gas backflush port 301-3 is used to inject compressed air to empty the dirty liquid remaining in the filter tank 301 and on each filter element 301-2. After being cleaned by a clean fluid, some dirty liquid will still remain on the filter element 301-2. At this time, compressed air is injected into the gas backflush port 301-3 located at the top of the filter tank 301 by gas backflush, and the dirty liquid remaining in the filter tank 301 and on the filter element 301-2 is discharged to the dirty liquid pipeline A9 through the oil discharge port 301-4 at the bottom, and the cleaned dirty liquid enters the cleaning filter tank 2 through the dirty liquid pipeline A9 for further treatment.

[0026] The dirty liquid discharge port of the cleaning filter tank 2 is connected to the dirty liquid pipeline B8. After the cleaning filter tank 2 is cleaned by the clean fluid in the filtering equipment water tank 5, the dirty liquid enters the slag collecting part 1 through the dirty liquid pipeline B8. The cleaning filter tank 2 is used to further process the dirty liquid of the cleaning filter tank group 3 so as to recover the cleaning liquid for subsequent cleaning of the filter tank group 3; on the one hand, it reduces the discharge of dirty liquid, and on the other hand, it saves production costs.

[0027] Example like Figures 1 to 4As shown, an online automatic filter element cleaning system reads the filtration flow of the filter tank group 3 through the flow monitor 10, and monitors the flow of the filter tank group after the backwash cleaning action of the filter device is completed. When the monitored flow value is lower than the set flow threshold, the PLC records the filter tank group 3 that is lower than the set flow threshold and then performs filter element cleaning on the filter tank 301 in the order of the filter tank group 3. During the cleaning, the cleaned filter tank 301 stops filtering, and the standby cooling pump 4 starts to extract the filtered clean fluid in the water tank 5 of the filter device through the matching cleaning main line 7 to flow into the cleaning branch line 6. The clean fluid is introduced into the filter tank 301 that needs to be cleaned through the control valve 601 on the cleaning branch line 6. In order to ensure that the filter element 301-301 in each filter tank 301 is 2 is subjected to uniform cleaning fluid flow and pressure values. A blocking mechanism 301-1 is added to the top 301-5 of the filter tank. After flow calculation, it is ensured that the clean fluid entering from the top 301-5 of the filter tank first fills the top 301-5 of the filter tank and then flows into the core of each filter element 301-2. In the process of the clean fluid being driven from the core of the filter element 301-2 into the outer filter paper part, the gap between the filter papers is opened by using the compression stability of the fluid, and the filtered impurities between the filter papers are completely discharged. Then, compressed air is injected from the gas backflush port 301-3 above the filter tank 301 to clear the dirty liquid remaining in the filter tank 301 and on each filter element 301-2 in the tank. The dirty liquid is discharged from the oil discharge port 301-4 at the bottom of the filter tank 301 and passes through the dirty liquid pipeline A9. The clean fluid flows into the cleaning filter tank 2, and the clean fluid filtered by the cleaning filter tank 2 flows directly back to the water tank 5 of the filtering equipment; when all the filter tank groups 3 that need to be cleaned are cleaned, the cleaning branch pipeline 6 and the control valve 601 on the branch pipeline are used to introduce the clean fluid in the water tank 5 of the filtering equipment into the cleaning filter tank 2, and the cleaning filter tank 2 is cleaned. The dirty liquid discharged after cleaning flows into the slag collecting part 1 through the dirty liquid pipeline B8 for treatment. The filtration flow of the filter tank group 3 is monitored in real time by installing a digital flow monitor 10 on each group of filter tanks in the filtering part. The flow value is uploaded to the PLC control end of the equipment and forms a real-time flow curve. When the equipment itself completes each round of backwash cleaning, the system will record the filter tank group 3 that is below the flow setting threshold, and clean them one by one in sequence to ensure that the filtering capacity of the equipment is maintained above the set threshold for a long time. Figure 5The operation process of the online automatic cleaning system of the filter element is to manually set the flow threshold first. After each backwash cleaning of the filter element by the filter equipment, the flow monitoring is used to determine whether the filtration flow is lower than the set flow threshold. If it is not lower than the flow threshold, the filter equipment operates normally and the online automatic cleaning system does not intervene. When the flow is lower than the threshold, it switches to the automatic cleaning system for operation: switch to the standby cooling pump 4 to pump clean fluid into the filter tank group 3 that needs to be cleaned. After the dirty fluid is filtered by the cleaning filter tank 2, the clean fluid flows back to the equipment water tank 5. When all the filter tank groups 3 that need to be cleaned are cleaned, the cleaning filter tank 2 is cleaned again, and the dirty fluid after cleaning flows into the slag collecting part 1 of the filter equipment, and the cycle is repeated in sequence. During the operation of the filter equipment, the flow monitoring records the equipment filtration flow in real time, and displays the digital flow value and flow curve on the equipment display.

[0028] Table 1 below lists the flow rates of seven different filter elements numbered 1-7 after being cleaned using the equipment's built-in backflush method and using an online automatic cleaning system.

[0029]

[0030] The present invention also includes a cleaning process method that cooperates with the online automatic cleaning system of the filter element to ensure that the filter element is thoroughly cleaned while ensuring that the filter element paper material will not be damaged and the operating efficiency of the filtering equipment will not be affected. The cleaning fluid pressure is 3.5 bar, the cleaning time is 80 seconds, and the flow rate is 330 L / min; the compressed air injection time is 120 seconds, and the compressed air pressure is 3 bar; the cleaning method is: first inject compressed air to discharge the fluid in the filter tank, then inject clean fluid, and then introduce compressed air. If the flow threshold setting value is large, it can be repeated many times.

[0031] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A filter element online automatic cleaning system, characterized in that: The cleaning system comprises a filtering part composed of a plurality of filter tank groups, a standby cooling pump, a filter equipment water tank, a main cleaning line, a plurality of cleaning branch lines, a cleaning filter tank and a slag collecting part; the standby cooling pump is connected to the filter equipment water tank and the main cleaning line, the main cleaning line is connected to each cleaning branch line, the cleaning branch line is connected to each filter tank group, each filter tank group is connected to the cleaning filter tank through a dirty liquid pipeline, and the cleaning filter tank is connected to the filter equipment water tank and the slag collecting part through pipelines respectively; The cleaning method of the cleaning system is as follows: the clean fluid in the water tank of the filter equipment is injected into the top of the filter tank that needs to be cleaned through the standby cooling pump through the main cleaning pipeline and each cleaning branch pipeline; the clean fluid enters from the core of the filter element in the filter tank and flows out from the surface of the filter element, and the gap between the filter paper of the filter element is opened by utilizing the compression stability of the fluid to completely discharge the filtered impurities; the dirty liquid in the filter tank and on each filter element in the tank is emptied by backblowing compressed air; the dirty liquid enters the cleaning filter tank through the dirty liquid pipeline for filtration treatment and then flows back to the water tank of the filter equipment.

2. The filter element online automatic cleaning system according to claim 1, characterized in that: Each of the filter tank groups is provided with a flow monitor, which is used to monitor the filtration flow of the filter tank group; when the filter equipment's own backwash cleaning action is completed, the flow of the filter tank group is monitored, and when the monitored flow value is lower than the set flow threshold, the filter tank group stops filtering and starts cleaning.

3. The filter element online automatic cleaning system according to claim 1, characterized in that: Each cleaning branch pipeline connected to the filter tank group is provided with a control valve, and clean fluid is introduced into the filter tank that needs to be cleaned through the control valve.

4. The filter element online automatic cleaning system according to claim 1, characterized in that: A plurality of filter elements are evenly arranged in the filter tank, and a blocking mechanism is provided on the top of the filter tank, and the blocking mechanism is arranged above the filter element; the blocking mechanism, the space at the top of the filter tank, and the core of each filter element together constitute a shower structure for ensuring that the flow rate and pressure value of the clean fluid received by each filter element in the filter tank are uniform.

5. The filter element online automatic cleaning system according to claim 4, characterized in that: The blocking mechanism comprises a baffle plate which is arranged perpendicularly to each filter element, and the baffle plate is connected to the top of the filter tank through a plurality of connecting columns.

6. The filter element online automatic cleaning system according to claim 1, characterized in that: A cleaning liquid inlet is provided at the top of the filter tank, and the cleaning liquid inlet is connected to the cleaning branch pipeline; an oil drain port is provided at the bottom of the filter tank, and the oil drain port is connected to the dirty liquid pipeline A, and the other end of the dirty liquid pipeline A is connected to the cleaning filter tank.

7. The filter element online automatic cleaning system according to claim 1, characterized in that: A gas backflush port is provided above the filter tank, and the gas backflush port is used to inject compressed air to clear the dirty liquid remaining in the filter tank and on each filter element in the tank.

8. The filter element online automatic cleaning system according to claim 1, characterized in that: The dirty liquid discharge port of the cleaning filter tank is connected to the dirty liquid pipeline B. After the cleaning filter tank is cleaned by the clean fluid in the water tank of the filtering equipment, the dirty liquid enters the slag collecting part through the dirty liquid pipeline B.

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