Dual path filter control system with automatic switching

Abstract

The utility model discloses an automatic switching's two -way filter control system relates to chemical production technical field, and the main purpose is through setting up a plurality of monitoring points before and after the filter, realizes the automatic switching of two -way filter. The main technical scheme of the utility model is as follows: automatic switching's two -way filter control system, this system includes: at least two parallel filter units, every filter unit includes the feed control valve, filter body and discharge control valve that connect gradually, and the pipeline wall of feed control valve front end is equipped with first pressure transmitter, and the pipeline wall between feed control valve and filter body is equipped with second pressure transmitter, and the pipeline wall between filter body and discharge control valve is equipped with third pressure transmitter, and the pipeline wall of discharge control valve rear end is equipped with fourth pressure transmitter.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, and in particular to an automatic switching dual-path filter control system. Background Technology

[0002] Currently, in industrial production processes such as chemical, pharmaceutical, and food processing, filters are key equipment for removing impurities from fluids and ensuring product quality. As the filtration process continues, the filter element will experience increased flow resistance due to the trapping of impurities, and the inlet and outlet pressure difference will gradually rise. When the pressure difference is too high, it will not only reduce the fluid flow rate and affect production efficiency, but may also damage the filter and downstream equipment.

[0003] Currently, most companies manually monitor the pressure difference across the filter, switching to a backup filter when the difference is too high. This method suffers from response delays and significant human error, potentially leading to production interruptions or product quality degradation. Some existing automatic switching systems, due to their single pressure difference monitoring point, cannot accurately reflect the internal blockage status of the filter, posing a risk of misjudgment. Furthermore, the lack of proactive handling and maintenance mechanisms for filter blockage makes it difficult to meet the demands of efficient, stable, and intelligent modern industrial production. Utility Model Content

[0004] In view of this, the present invention provides an automatic switching dual-path filter control system and control method, the main purpose of which is to realize the automatic switching of dual-path filters by setting multiple monitoring points before and after the filter.

[0005] To achieve the above objectives, this utility model mainly provides the following technical solutions:

[0006] On the one hand, this utility model embodiment provides an automatically switching dual-path filter control system, which includes: at least two filter units connected in parallel;

[0007] Each of the filter units includes a feed control valve, a filter body, and a discharge control valve connected in sequence. A first pressure transmitter is installed on the pipe wall at the front end of the feed control valve, a second pressure transmitter is installed on the pipe wall between the feed control valve and the filter body, a third pressure transmitter is installed on the pipe wall between the filter body and the discharge control valve, and a fourth pressure transmitter is installed on the pipe wall at the rear end of the discharge control valve.

[0008] The first, second, third, and fourth pressure transmitters are respectively connected to the input terminal of the controller, and the output terminal of the controller is electrically connected to the feed control valve and the discharge control valve, respectively. The controller stores a first preset pressure signal and a second preset pressure signal. The difference between the pressure signal monitored by the first and fourth pressure transmitters is compared with the first preset pressure signal, and the difference between the pressure signal monitored by the second and third pressure transmitters is compared with the second preset pressure signal to determine the blockage location of the filter unit.

[0009] The purpose of this utility model and the technical problems to be solved can be further achieved by the following technical measures.

[0010] Optionally, each of the filter units further includes a front hand valve and a rear hand valve, wherein the front hand valve, the first pressure transmitter, and the feed control valve are arranged in sequence, and the discharge control valve, the fourth pressure transmitter, and the rear hand valve are arranged in sequence.

[0011] Optionally, each of the filter units further includes a discharge control valve, which is installed at the lower end of the filter body, and the output of the controller is electrically connected to the discharge control valve.

[0012] Optionally, the filtration unit further includes a cleaning mechanism, which includes a hydraulic cylinder and a cleaning brush. The hydraulic cylinder is fixedly installed on the top wall of the filter body, and the piston rod of the hydraulic cylinder passes through the top wall of the filter body and is fixedly connected to the cleaning brush for driving the cleaning brush to move up and down. The output end of the controller is electrically connected to the solenoid valve of the oil circuit where the hydraulic cylinder is located.

[0013] On the other hand, embodiments of this utility model provide an automatic switching dual-channel filter control method, comprising the following steps:

[0014] (1) Set the first preset pressure electrical signal ΔPset1 and the second preset pressure electrical signal ΔPset2 through the human-machine interface of the controller.

[0015] (2) Set the initial state of the system through the controller: Filter unit A is in the running state, wherein the front hand valve, feed control valve, discharge control valve and rear hand valve of filter unit A are in the open state, and the discharge control valve of filter unit A is in the closed state; Filter unit B is in the standby state, wherein the feed control valve, discharge control valve and discharge control valve of filter unit B are in the closed state, and the front hand valve and rear hand valve of filter unit B are in the open state;

[0016] (3) The controller acquires the first pressure transmitter monitoring pressure signal PA1, the second pressure transmitter monitoring pressure signal PA2, the third pressure transmitter monitoring pressure signal PA3 and the fourth pressure transmitter monitoring pressure signal PA4 of the filter unit A in real time, and calculates ΔPA1=PA1-PA4, ΔPA2=PA2-PA3.

[0017] (4) If ΔPA1 is greater than or equal to ΔPset1 and ΔPA2 is greater than ΔPset2, and the above situation lasts for 10 seconds, the controller switches the state of filter unit A and filter unit B and displays "Filter body of filter unit A needs to be cleaned" on the human-machine interface of the controller.

[0018] If ΔPA1 is greater than or equal to ΔPset1 and ΔPA2 is less than ΔPset2, and this situation continues for 10 seconds, the controller switches the state of filter unit A and filter unit B, and displays "The feed control valve and discharge control valve of filter unit A need to be inspected" on the human-machine interface of the controller.

[0019] (5) The human-machine interface of the controller displays the prompt message "Switched to filter unit B". At the same time, the controller activates the field warning light and begins to acquire the first pressure transmitter monitoring pressure signal PB1, the second pressure transmitter monitoring pressure signal PB2, the third pressure transmitter monitoring pressure signal PB3 and the fourth pressure transmitter monitoring pressure signal PB4 of the filter unit B in real time, and calculates ΔPB1=PB1-PB4, ΔPB2=PB2-PB3;

[0020] Compare the magnitudes of ΔPB1 and ΔPset1, and compare the magnitudes of ΔPB2 and ΔPset2;

[0021] (6) This cycle is repeated to achieve automatic switching between filter unit A and filter unit B.

[0022] Optionally, in step (4), if ΔPA1 is greater than or equal to ΔPset1, ΔPA2 is greater than ΔPset2, and this condition persists for 10 seconds, the controller switches the discharge control valve of filter unit A to the closed state, switches the discharge control valve of filter unit A to the open state, and repeatedly switches the valve position of the solenoid valve in the oil circuit where the hydraulic cylinder is located, thereby driving the cleaning brush to move up and down repeatedly. After cleaning the filter body for a preset time, the controller sequentially switches the feed control valve and discharge control valve of filter unit A to the closed state.

[0023] Optionally, in step (4), when switching the state of filter unit A and filter unit B, the controller switches the feed control valve and discharge control valve of filter unit B to the open state for 10 seconds, and then switches the discharge control valve of filter unit A to the closed state.

[0024] By employing the above technical solution, this utility model has at least the following advantages:

[0025] 1. Precise monitoring and judgment: By setting multiple pressure monitoring points before and after the filter, it is possible to more accurately distinguish between filter blockage and pipeline valve failure, reduce misjudgment, and improve the accuracy and reliability of system judgment.

[0026] 2. High degree of automation: It realizes automatic monitoring and switching of main and standby filters based on pressure difference, reduces manual intervention, reduces labor intensity and the risk of human error, and ensures production continuity.

[0027] 3. Intelligent management: It has functions such as automatically generating maintenance prompts, which facilitates equipment management and maintenance and extends the service life of the filter.

[0028] 4. High versatility: It is suitable for dual-path filter systems in various industrial scenarios. By adjusting the differential pressure setpoint and control parameters, it can meet different process requirements and fluid filtration requirements. Attached Figure Description

[0029] Figure 1 A schematic diagram of an automatically switching dual-channel filter control system provided for an embodiment of this utility model;

[0030] Figure 2 This is a schematic diagram of the filter body.

[0031] The reference numerals in the accompanying drawings include: feed control valve 1, filter body 2, discharge control valve 3, first pressure transmitter 4, second pressure transmitter 5, third pressure transmitter 6, fourth pressure transmitter 7, controller 8, front hand valve 9, rear hand valve 10, discharge control valve 11, hydraulic cylinder 12, cleaning brush 13, and solenoid valve 14. Detailed Implementation

[0032] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0034] like Figure 1As shown, one embodiment of the present invention provides an automatic switching dual-path filter control system, which includes: at least two parallel filter units (in this embodiment, parallel filter unit A and filter unit B are used as examples);

[0035] Each of the filter units includes a feed control valve 1, a filter body 2, and a discharge control valve 3 connected in sequence. A first pressure transmitter 4 is installed on the pipe wall at the front end of the feed control valve 1. A second pressure transmitter 5 is installed on the pipe wall between the feed control valve 1 and the filter body 2. A third pressure transmitter 6 is installed on the pipe wall between the filter body 2 and the discharge control valve 3. A fourth pressure transmitter 7 is installed on the pipe wall at the rear end of the discharge control valve 3.

[0036] The first pressure transmitter 4, the second pressure transmitter 5, the third pressure transmitter 6, and the fourth pressure transmitter 7 are electrically connected to the input terminal of the controller 8, and the output terminal of the controller 8 is electrically connected to the feed control valve 1 and the discharge control valve 3, respectively. The controller 8 stores a first preset pressure signal and a second preset pressure signal. The difference between the pressure signal monitored by the first pressure transmitter 4 and the pressure signal monitored by the fourth pressure transmitter 7 is compared with the first preset pressure signal, and the difference between the pressure signal monitored by the second pressure transmitter 5 and the pressure signal monitored by the third pressure transmitter 6 is compared with the second preset pressure signal to determine the blockage location of the filter unit.

[0037] Specifically, the controller 8 first compares the difference ΔPA1 between the pressure signal P1 monitored by the first pressure transmitter 4 and the pressure signal P4 monitored by the fourth pressure transmitter 7 with the magnitude of the first preset pressure signal ΔPset1. If the difference ΔPA1 is greater than the first preset pressure signal ΔPset1, it indicates that there is a blockage in the filter unit A. Then, it compares the difference ΔPA2 between the pressure signal P2 monitored by the second pressure transmitter 5 and the pressure signal P3 monitored by the third pressure transmitter 6 with the magnitude of the second preset pressure signal ΔPset2. If the difference ΔPA2 is greater than the second preset pressure signal ΔPset2, it indicates that the filter screen of the filter body 2 is blocked. If the difference ΔPA2 is less than the second preset pressure signal ΔPset2, it indicates that there is a fault in the feed control valve 1 or the discharge control valve 3, and it needs to be repaired.

[0038] Specifically, both the feed control valve 1 and the discharge control valve 3 are pneumatic regulating valves.

[0039] Specifically, the controller 8 is equipped with a human-machine interface (HMI) that can display the pressure transmitter readings and control valve status in real time, and supports the modification of the first preset pressure signal ΔPset1 and the second preset pressure signal Δpset2.

[0040] In a specific embodiment, each of the filter units further includes a front hand valve 9 and a rear hand valve 10, wherein the front hand valve 9, the first pressure transmitter 4 and the feed control valve 1 are arranged in sequence, and the discharge control valve 3, the fourth pressure transmitter 7 and the rear hand valve 10 are arranged in sequence.

[0041] In this embodiment, specifically, if the feed control valve 1 and discharge control valve 3 of one of the filter units are faulty and require maintenance, the operator can close the front hand valve 9 and the rear hand valve 10 to disconnect the feed control valve 1 and discharge control valve 3 of the filter unit from the material flow pipeline, thus avoiding material leakage when repairing the control valves.

[0042] In a specific embodiment, each of the filter units further includes a discharge control valve 11, which is installed at the lower end of the filter body 2, and the output of the controller 8 is electrically connected to the discharge control valve 11.

[0043] In this embodiment, specifically, the discharge control valve 11 is a pneumatic regulating valve, and the output terminal of the controller 8 is electrically connected to the discharge control valve 11, which facilitates the timely discharge of impurities through DCS control program.

[0044] like Figure 2 As shown, in a specific embodiment, the filtration unit further includes a cleaning mechanism, which includes a hydraulic cylinder 12 and a cleaning brush 13. The hydraulic cylinder 12 is fixedly installed on the top wall of the filter body 2. The piston rod of the hydraulic cylinder 12 passes through the top wall of the filter body 2 and is fixedly connected to the cleaning brush 13 for driving the cleaning brush 13 to move up and down. The output end of the controller 8 is electrically connected to the solenoid valve 14 of the oil circuit where the hydraulic cylinder 12 is located.

[0045] In this embodiment, specifically, the cylinder body of the hydraulic cylinder 12 is fixedly installed on the top wall of the filter body 2. The top wall of the filter body 2 is provided with a through hole, and the piston rod passes through the through hole. Sealing filler is filled between the piston rod and the inner edge of the through hole to prevent the material in the filter body 2 from leaking through the gap between the through hole and the piston rod. The lower end of the piston rod passes through the top wall of the filter body 2 and is fixedly connected to the mounting plate. Multiple cleaning brushes 13 are evenly distributed around the periphery of the mounting plate. During the up-and-down movement of the cleaning brushes 13, the cleaning brushes 13 scrape the filter screen of the filter body 2 to facilitate the removal of impurities attached to the filter screen.

[0046] Specifically, the solenoid valve 14 is a two-position four-way valve. The output of the controller 8 changes the valve position of the two-position four-way valve by adjusting the current direction of the solenoid coil of the solenoid valve 14, thereby changing the pressure difference on both sides of the piston in the hydraulic cylinder 12, which in turn drives the piston rod to move up and down.

[0047] On the other hand, another embodiment of this utility model provides an automatic switching dual-channel filter control method, including the following steps:

[0048] (1) Set the first preset pressure signal ΔPset1 to 0.2MPa and the second preset pressure signal ΔPset2 to 0.05MPa through the human-machine interface of the controller 8;

[0049] (2) Set the initial state of the system through the controller 8: the filter unit A is in the running state, wherein the front hand valve 9, the feed control valve 1, the discharge control valve 3 and the rear hand valve 10 of the filter unit A are in the open state, and the discharge control valve 11 of the filter unit A is in the closed state; the filter unit B is in the standby state, wherein the feed control valve 1, the discharge control valve 3 and the discharge control valve 11 of the filter unit B are in the closed state, and the front hand valve 9 and the rear hand valve 10 of the filter unit B are in the open state;

[0050] (3) The controller 8 acquires the pressure signal PA1 monitored by the first pressure transmitter 4, the pressure signal PA2 monitored by the second pressure transmitter 5, the pressure signal PA3 monitored by the third pressure transmitter 6, and the pressure signal PA4 monitored by the fourth pressure transmitter 7 of the filter unit A in real time, and calculates ΔPA1=PA1-PA4, ΔPA2=PA2-PA3.

[0051] (4) If ΔPA1 is greater than or equal to ΔPset1 and ΔPA2 is greater than ΔPset2, and the above situation lasts for 10 seconds, the controller 8 switches the state of filter unit A and filter unit B, and displays "Filter body 2 of filter unit A needs to be cleaned" on the human-machine interface of the controller 8.

[0052] If ΔPA1 is greater than or equal to ΔPset1 and ΔPA2 is less than ΔPset2, and this situation continues for 10 seconds, the controller 8 switches the state of filter unit A and filter unit B, and displays "The feed control valve 1 and discharge control valve 3 of filter unit A need to be inspected" on the human-machine interface of the controller 8.

[0053] (5) The human-machine interface of the controller 8 displays the prompt message "Switched to filter unit B". At the same time, the controller 8 activates the field warning light and begins to acquire the pressure signal PB1 monitored by the first pressure transmitter 4, the pressure signal PB2 monitored by the second pressure transmitter 5, the pressure signal PB3 monitored by the third pressure transmitter 6, and the pressure signal PB4 monitored by the fourth pressure transmitter 7 of the filter unit B in real time, and calculates ΔPB1=PB1-PB4, ΔPB2=PB2-PB3;

[0054] Compare the magnitudes of ΔPB1 and ΔPset1, and compare the magnitudes of ΔPB2 and ΔPset2;

[0055] (6) This cycle is repeated to achieve automatic switching between filter unit A and filter unit B.

[0056] In this embodiment, specifically, when the filter unit B detects that ΔPB1 is greater than or equal to ΔPset1 and ΔPB2 is greater than ΔPset2 during operation, and the controller 8 switches the filter unit B back to the filter unit A, if the filter unit A has not been cleaned or repaired, the human-machine interface of the controller 8 displays "dual-channel fault alarm".

[0057] At this point, the human-machine interface of controller 8 displays "It is recommended to switch to manual operation". After the operator is authorized, he / she can force the selection of filter unit A or filter unit B to run. Manual operation will override the automatic switching operation.

[0058] In a specific implementation, in step (4), if ΔPA1 is greater than or equal to ΔPset1, ΔPA2 is greater than ΔPset2, and this condition persists for 10 seconds, the controller 8 switches the discharge control valve 3 of the filter unit A to the closed state, switches the discharge control valve 11 of the filter unit A to the open state, and repeatedly switches the valve position of the solenoid valve 14 in the oil circuit where the hydraulic cylinder 12 is located, thereby driving the cleaning brush 13 to move up and down repeatedly. After cleaning the filter body 2 for a preset time, the controller 8 sequentially switches the feed control valve 1 and the discharge control valve 11 of the filter unit A to the closed state.

[0059] In this embodiment, specifically, the operator can set a preset time on the human-machine interface of the controller 8 according to the actual cleaning effect of the cleaning brush 13 on the filter screen. The cleaning brush 13 cleans the filter screen for the preset time (during the above process, the filter unit A has been switched to the filter unit B, the discharge control valve 3 of the filter unit A is closed, and the feed control valve 1 and discharge control valve 11 of the filter unit A are open). The material fluid in the pipeline carries the impurities that have left the filter screen out of the filter body 2 through the discharge control valve 11.

[0060] In a specific implementation, in step (4), when switching the state of filter unit A and filter unit B, the controller 8 switches the feed control valve 1 and discharge control valve 3 of filter unit B to the open state for 10 seconds, and then switches the discharge control valve 3 of filter unit A to the closed state.

[0061] In this embodiment, there is a 10-second time difference between the open state of filter unit B and the closed state of filter unit A. Filter unit A is then closed after ensuring the material flow in filter unit B to avoid material interruption.

[0062] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An automatic switching dual-channel filter control system, characterized in that, include: At least two parallel filter units, each filter unit including a feed control valve, a filter body and a discharge control valve connected in sequence, a first pressure transmitter installed on the pipe wall at the front end of the feed control valve, a second pressure transmitter installed on the pipe wall between the feed control valve and the filter body, a third pressure transmitter installed on the pipe wall between the filter body and the discharge control valve, and a fourth pressure transmitter installed on the pipe wall at the rear end of the discharge control valve; The first, second, third, and fourth pressure transmitters are respectively connected to the input terminal of the controller, and the output terminal of the controller is electrically connected to the feed control valve and the discharge control valve, respectively. The controller stores a first preset pressure signal and a second preset pressure signal. The difference between the pressure signal monitored by the first and fourth pressure transmitters is compared with the first preset pressure signal, and the difference between the pressure signal monitored by the second and third pressure transmitters is compared with the second preset pressure signal to determine the blockage location of the filter unit.

2. The automatic switching dual-channel filter control system according to claim 1, characterized in that, Each of the filter units further includes a front hand valve and a rear hand valve, wherein the front hand valve, the first pressure transmitter and the feed control valve are arranged in sequence, and the discharge control valve, the fourth pressure transmitter and the rear hand valve are arranged in sequence.

3. The automatic switching dual-channel filter control system according to claim 1, characterized in that, Each of the filter units also includes a discharge control valve, which is installed at the lower end of the filter body, and the output of the controller is electrically connected to the discharge control valve.

4. The automatic switching dual-channel filter control system according to claim 3, characterized in that, The filtration unit also includes a cleaning mechanism, which includes a hydraulic cylinder and a cleaning brush. The hydraulic cylinder is fixedly installed on the top wall of the filter body. The piston rod of the hydraulic cylinder passes through the top wall of the filter body and is fixedly connected to the cleaning brush, which is used to drive the cleaning brush to move up and down. The output end of the controller is electrically connected to the solenoid valve of the oil circuit where the hydraulic cylinder is located.

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