Automatic flushing and pressure regulating method for filter pipeline

Abstract

The application provides a filter pipeline automatic flushing and pressure regulating method, which can automatically identify the blockage of a filter and corresponding pipeline and automatically clean the filter without removing the filter from a pipeline system, thereby avoiding the risk of adding extra substances in the pipeline system, and particularly reducing the risk of water vapor entering a liquid oxygen and liquid methane pipeline system. The filter pipeline automatic flushing and pressure regulating method can also compensate for the pressure loss of fluid after passing through the filter, solve the problem of pressure difference before and after the filter, and meet the test scene with strict requirements on fluid pressure loss. All functions of the method can be automatically controlled, which greatly shortens the operation time, saves the labor cost, and reduces the possibility of adding extra substances in the pipeline system.

Description

Technical Field

[0001] This invention relates to the field of filtration technology, and in particular to an automatic flushing and pressure regulation method for filter pipelines. Background Technology

[0002] Filters, typically installed in filtration pipelines, are precision devices that use a filter screen to directly intercept impurities and excess substances in fluids, protecting downstream systems and ensuring their normal operation. After a period of use, filter screens can easily become clogged with debris, increasing pressure loss in the fluid passing through the filter and affecting the normal operation of downstream systems.

[0003] Currently, the common practice is to periodically check for blockages in the filter and then remove the filter from the piping system for cleaning. However, this process can easily lead to an increase in excess material inside the piping system.

[0004] Therefore, in order to reduce the pressure loss of fluid after passing through the filter, there is an urgent need to provide a method that can automatically clean and regulate the pressure of the filter pipeline. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes an automatic flushing and pressure regulation method for filter pipelines. This method can automatically determine the filter clogging status, automatically enter the filtration mode after automatic cleaning, and appropriately compensate for fluid pressure loss based on the pressure difference between the filter inlet and outlet.

[0006] This invention provides an automatic flushing and pressure regulation method for filter pipelines, comprising at least the following steps:

[0007] 1. Install the filter pipeline between the upstream and downstream pipelines;

[0008] 2. Set the first differential pressure value W and the second differential pressure value E on the control unit;

[0009] 3. Continuously collect the differential pressure signal Y1 between the inlet and outlet of the filter pipeline and transmit it to the control unit;

[0010] 4. Compare the differential pressure signal Y1 with the first differential pressure value W. If Y1≥W, then use the control unit to transfer the filter pipeline inlet to the discharge pipeline, and connect the cleaning pipeline to the filter pipeline outlet and then to the downstream pipeline, so that at least part of the fluid in the upstream pipeline enters the filter pipeline in reverse through the cleaning pipeline to flush it.

[0011] 5. Continuously compare the differential pressure signal Y1 after iteration. If |Y1| < E, then disconnect the cleaning pipeline using the control unit to complete the flushing.

[0012] 6. Use the control unit to transfer the filter pipeline inlet to the upstream pipeline, and connect the pressure regulating pipeline to the filter pipeline outlet and then to the downstream pipeline;

[0013] 7. Continuously collect the differential pressure signal Y2 between the inlet and outlet of the filter pipeline and transmit it to the control unit;

[0014] 8. Compare the differential pressure signal Y2 with the first differential pressure value W. If Y2 < W, then use the control unit to increase the fluid flow rate of the pressure regulating pipeline and increase the pressure on the outlet side of the filter pipeline.

[0015] 9. Continuously compare the differential pressure signal Y2 after iteration. If Y2 = 0, use the control unit to stop controlling the fluid flow of the pressure regulating pipeline to maintain the current opening, and the pressure regulation is completed.

[0016] Furthermore, the specific method of setting the filter pipeline between the upstream and downstream pipelines is as follows: a first filter installed in the filter pipeline has its inlet connected to two pipelines respectively; the first pipeline is connected to the upstream pipeline through a first solenoid valve, and the second pipeline is connected to the discharge pipeline equipped with a second solenoid valve; the outlet of the first filter is connected to the downstream pipeline; pressure transmitters for collecting differential pressure are also provided at both ends of the first filter; a pressure regulating pipeline and a cleaning pipeline are arranged in parallel; the inlets of the pressure regulating pipeline and the cleaning pipeline are respectively connected to the upstream pipeline, and the outlets are respectively connected to the outlet of the first filter and then connected to the downstream pipeline.

[0017] Furthermore, the method of using the control unit to transfer the filter pipeline inlet to the discharge pipeline is as follows: the control unit closes the first solenoid valve and opens the second solenoid valve, so that the first filter inlet is connected to the discharge pipeline through the second pipeline and the second solenoid valve.

[0018] Furthermore, before stopping the control of the liquid flow rate in the pressure regulating pipeline by the control unit, the method further includes: continuously comparing the iteratively obtained differential pressure signal Y2. If Y2 > 0, the control unit continues to control the liquid flow rate in the regulating pipeline to increase until Y2 = 0.

[0019] In the above embodiment, the first differential pressure value W is greater than the second differential pressure value E.

[0020] In one embodiment, the pressure transmitter is disposed at both ends of the first filter to detect the pressure difference between the inlet and outlet of the fluid after it passes through the filter.

[0021] In one embodiment, the pressure regulating line includes at least a regulating valve; in the filtration process, the opening of the regulating valve is adjusted by the control unit, which can adjust the pressure difference between the inlet and outlet of the first filter.

[0022] In one embodiment, the cleaning pipeline includes at least a booster pump; during the cleaning process, the booster pump is started and the regulating valve is closed using a control unit. The fluid in the upstream pipeline is pressurized by the booster pump in the cleaning pipeline and enters the outlet of the first filter, making the pressure on the outlet side of the first filter greater than the pressure on the inlet side, thereby causing at least a portion of the fluid to enter the first filter in reverse for reverse cleaning.

[0023] In one embodiment, the booster pump is connected in parallel with the regulating valve, one side of which is connected to the upstream pipeline, and the other side is connected in series with the inlet of the second filter. The outlet of the second filter is connected to the outlet of the first filter through a pipeline and then to the downstream pipeline. The inlets of the regulating valve and the booster pump are respectively connected to the upstream pipeline through pipelines.

[0024] In one embodiment, the first filter and the second filter have the same precision.

[0025] The present invention provides an automatic flushing and pressure regulation method for filter pipelines, which has at least one of the following beneficial effects:

[0026] The automatic flushing and pressure regulation method for filter pipelines of the present invention eliminates the need for inspection of the filter pipelines and filters for ruptures, and can automatically determine the filter blockage status, solving the problem that existing filters cannot automatically determine the blockage status, avoiding the increase of excess material in the pipeline system, and especially reducing the risk of water vapor entering the liquid oxygen and liquid methane pipeline systems.

[0027] 2. The automatic flushing and pressure regulation method for filter pipelines of the present invention can automatically clean the filter and corresponding pipelines without removing the filter from the pipeline system.

[0028] Third, the automatic flushing and pressure regulation method for filter pipelines of the present invention can also compensate for the pressure loss of fluid after passing through the filter, solving the problem of pressure difference before and after the filter in the past, and can meet the test scenarios with strict requirements for fluid pressure loss.

[0029] Fourth, all functions in this method embodiment can be automatically controlled, which greatly shortens the cleaning time, saves labor costs, and reduces the possibility of the increase of foreign matter in the pipeline system.

[0030] Upon reading the detailed embodiments and examining the accompanying drawings, those skilled in the art will recognize additional features and advantages. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a flowchart of an automatic flushing and pressure regulation method for filter pipelines according to an embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram of the automatic flushing and pressure regulation method for filter pipelines according to an embodiment of the present invention during the automatic cleaning process.

[0034] Figure 3 This is a schematic diagram of the automatic pressure regulation process of the filter pipeline automatic flushing and pressure regulation method according to an embodiment of the present invention.

[0035] Figure label:

[0036] 1-Filter line, 2-Pressure regulating line, 3-Cleaning line, 4-First solenoid valve, 5-Second solenoid valve, 6-Control unit, 7-Second filter, L1-Upstream line, L2-Downstream line, L3-Discharge line, 11-First filter, 12-Pressure transmitter, 21-Regulating valve, 31-Booster pump. Detailed Implementation

[0037] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and to exemplify the principles of the present invention, and are not configured to limit the present invention. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of the present invention.

[0038] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0039] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0040] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., and should not be considered limiting. Similar terms are used throughout the description to refer to similar elements.

[0041] It will be apparent to those skilled in the art that the present invention can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

[0042] See Figure 1 The present invention provides an automatic flushing and pressure regulation method for filter pipelines, comprising the following steps:

[0043] S10. Set the filter pipeline between the upstream pipeline and the downstream pipeline.

[0044] S20. Set the first differential pressure value W and the second differential pressure value E on the control unit.

[0045] S30: Continuously collect the differential pressure signal Y1 between the inlet and outlet of the filter pipeline and transmit it to the control unit.

[0046] S40. Compare the differential pressure signal Y1 with the first differential pressure value W. If Y1≥W, use the control unit to transfer the filter pipe inlet to the discharge pipe, and connect the cleaning pipe to the filter pipe outlet and then to the downstream pipe, so that at least part of the fluid in the upstream pipe enters the filter pipe in reverse through the cleaning pipe to flush it.

[0047] S50. Continuously compare the differential pressure signal Y1 after iteration. If |Y1| < E, then disconnect the cleaning pipeline using the control unit to complete the flushing.

[0048] S60. The control unit is used to transfer the filter pipeline inlet to the upstream pipeline, and the pressure regulating pipeline is connected to the filter pipeline outlet and then connected to the downstream pipeline.

[0049] S70 continuously collects the differential pressure signal Y2 between the inlet and outlet of the filter pipeline and transmits it to the control unit.

[0050] S80. Compare the differential pressure signal Y2 with the first differential pressure value W. If Y2 < W, then use the control unit to increase the fluid flow rate of the pressure regulating pipeline and increase the pressure on the outlet side of the filter pipeline.

[0051] S90. Continuously compare the differential pressure signal Y2 after iteration. If Y2 = 0, use the control unit to stop controlling the fluid flow of the pressure regulating pipeline to maintain the current opening degree, and the pressure regulation is completed.

[0052] See also Figure 1 and Figure 2 The filter line 1 inlet, pressure regulating line 2 inlet, and cleaning line 3 inlet are all connected to the upstream line L1. The filter line 1 outlet is connected to the outlets of pressure regulating line 2 and cleaning line 3, and then to the downstream line L2. In other words, fluid in the upstream line can be filtered through filter line 1 before entering the downstream line L2, and the fluid in the upstream line can also be pressure-regulated through pressure regulating line 2 before entering the outlet side of filter line 1. When automatic cleaning of the filter line is required, filter line 1 can be automatically reverse-cleaned through cleaning line 3. At least part of the fluid in cleaning line 3 enters from filter line 1 in reverse, and the remainder flows out through the downstream line L2.

[0053] Furthermore, the inlet of filter line 1 is divided into two lines. The first line is connected to the upstream line L1 via the first solenoid valve 4, and the second line is connected to the discharge line L3, which is equipped with the second solenoid valve 5. After entering the automatic cleaning process, the control unit 6 controls the second solenoid valve 5 to open and the first solenoid valve 4 to close, so that the fluid entering filter line 1 in the reverse direction can flow out through the discharge line L3.

[0054] Specifically, the control unit 6 compares the differential pressure signal Y1 with the first differential pressure value W. If Y1 ≥ W, the control unit simultaneously controls the first solenoid valve 4 to close and the second solenoid valve 5 to open, connecting the cleaning pipeline 3 to the outlet of the filter pipeline 1 and then to the downstream pipeline L3. By controlling the fluid flow rate of the cleaning pipeline 3 through the control unit 6, the pressure at the outlet side of the filter pipeline 1 is gradually increased until it exceeds the pressure at the inlet side, so that at least part of the fluid in the cleaning pipeline 3 enters through the outlet of the filter pipeline 1 and is discharged through the discharge pipeline L3 via the second solenoid valve 5, thereby performing reverse self-cleaning of the filter pipeline 1.

[0055] After the pipeline cleaning process is completed, the control unit simultaneously controls the first solenoid valve 4 to open and the second solenoid valve 5 to close, and connects the pressure regulating pipeline 2 to the outlet of the filter pipeline 1 and then to the downstream pipeline L3. The control unit 6 controls the fluid flow rate of the pressure regulating pipeline 2 to increase the pressure on the outlet side of the filter pipeline 1, thereby adjusting the pressure difference between the inlet and outlet of the filter pipeline 1 and compensating for the pressure loss of the fluid after passing through the filter pipeline 1.

[0056] It should be noted that pressure regulating line 2 and cleaning line 3 are not connected to filter line 1 at the same time.

[0057] The automatic flushing and pressure regulation method for filter pipelines in this invention eliminates the need to puncture the filter pipeline and filter itself to observe blockages. Even when blockages occur inside the filter pipeline, it is not necessary to disassemble and clean it. The pressure at the outlet side of the filter pipeline can be increased by cleaning the pipeline, causing at least part of the fluid to flow backwards into the filter pipeline, thus performing reverse cleaning and avoiding the risk of increased debris caused by disassembling the pipeline for cleaning. Simultaneously, during the filtration process, this application can also utilize a pressure regulating pipeline to adjust the pressure difference between the inlet and outlet sides of the filter pipeline to compensate for pressure losses incurred after the fluid passes through the filter.

[0058] See also Figure 1 and Figure 2 Furthermore, the filter pipeline 1 includes at least a first filter 11 and a pressure transmitter 12. The first filter 11 is used to filter the fluid flowing into the filter pipeline from the upstream pipeline L1. The pressure transmitter 12 is disposed at both ends of the first filter 11 and is used to detect the pressure difference between the inlet and outlet of the fluid after passing through the first filter 11. The inlet of the first filter 11 is connected to the first solenoid valve 4 through a first pipeline and to the second solenoid valve 5 through a second pipeline. The outlet of the first filter 11 is connected to the downstream pipeline L3. The pressure regulating pipeline 2 and the cleaning pipeline 3 are arranged in parallel. The outlets of the pressure regulating pipeline 2 and the cleaning pipeline 3 are respectively connected to the outlet of the first filter 11 and then to the downstream pipeline L3.

[0059] It is particularly important to note that in the filtration process, the outlet pressure of the first filter 11 only needs to be increased to be equal to the inlet pressure. That is, during the continuous comparison of the iteratively compared differential pressure signal Y2, if Y2 = 0, the outlet pressure of the first filter 11 equals the inlet pressure, and the control unit can stop controlling the fluid flow in the pressure regulating pipeline to maintain its current opening. In the automatic flushing process, the outlet pressure of the first filter 11 needs to be increased to be greater than the inlet pressure, so that the fluid can enter the first filter 11 in reverse to clean the filter itself and the corresponding pipeline. During the cleaning process, the iteratively compared differential pressure signal Y1 continues. Since the fluid is flowing through the first filter 11 in reverse, the collected Y1 signal may be negative; therefore, the absolute value of the differential pressure signal Y1 can be used for comparison. For example, if |Y1| < E, the control unit 6 disconnects the cleaning pipeline 3, and the flushing is complete.

[0060] In the above embodiment, the first differential pressure value W is greater than the second differential pressure value E.

[0061] Furthermore, before the control unit stops controlling the liquid flow rate in the pressure regulating pipeline, the process includes: continuously comparing the iteratively updated differential pressure signal Y2. If Y2 > 0, the control unit continues to increase the liquid flow rate in the regulating pipeline, causing the differential pressure between the inlet and outlet of the first filter 11 to decrease again. This process is repeated iteratively until the differential pressure signal Y2 equals 0. At this point, the control unit will no longer control the pressure regulating pipeline, maintaining the current flow rate.

[0062] See also Figure 2 and Figure 3 In the above embodiments, the pressure regulating pipeline 2 includes at least a regulating valve 21. The regulating valve 21 is an electrically operated regulating valve with an adjustable opening degree and a small size. It can be used to adjust the pressure difference between the inlet and outlet of the first filter 11 during the filtration process, compensating for the fluid pressure loss after passing through the first filter 11. During the filtration process, the opening degree of the regulating valve 21 is controlled by the control unit 6, thereby adjusting the pressure difference between the inlet and outlet of the first filter 11.

[0063] Furthermore, the cleaning pipeline 3 includes at least a booster pump 31. The booster pump 31 is used to increase the outlet pressure of the first filter 11 during the self-cleaning process, making it greater than the inlet pressure, to perform reverse cleaning of the first filter 11. The regulating valve 21 is connected in parallel with the booster pump 31; one side is connected to the upstream pipeline L1 via a pipeline, and the other side is connected in series with the inlet of the second filter 7 via a pipeline. The outlet of the second filter 7 is connected to the outlet of the first filter 11 via a pipeline and then to the downstream pipeline L2. The second filter 7 has the same filtration accuracy as the first filter 11 and is used to filter impurities in the fluid of the upstream pipeline, preventing the introduction of excess material during the reverse cleaning of the first filter 11 and the corresponding pipeline.

[0064] In the above embodiments, the control unit 6 is communicatively connected to the first solenoid valve 4, the second solenoid valve 5, the regulating valve 21, the pressure transmitter 12, and the booster pump 31.

[0065] Specifically, before starting the filtration process, a first differential pressure value W and a second differential pressure value E are set on the control unit 6. After the filtration process begins, the regulating valve 21 remains open, and the pressure transmitter 12 continuously collects the differential pressure signal Y1 across the first filter 11 and transmits it to the control unit 6. The control unit 6 compares the differential pressure signal Y1 with the first differential pressure value W. If Y1 ≥ W, the booster pump 31 is started to adjust the outlet pressure of the first filter 11 to be greater than the inlet pressure. At the same time, the control unit 6 closes the first solenoid valve 4 and opens the second solenoid valve 5, connecting the inlet of the first filter 11 to the discharge pipeline L3 through the second pipeline and the second solenoid valve 5. In this case, at least part of the fluid in the upstream pipeline L1 passes through the booster pump 31 and the second filter 7, and then flows back into the first filter 11 to flush it. Figure 2 The arrows in the diagram indicate the direction of fluid flow during the self-cleaning process.

[0066] During the rinsing process, the differential pressure signal Y1 after iteration is continuously compared. If |Y1| < E, the booster pump 31 is stopped by the control unit 6, and the first solenoid valve 4 is opened and the second solenoid valve 5 is closed by the control unit 6. The rinsing process is completed and the filtration process continues.

[0067] Pressure transmitter 12 continuously acquires the differential pressure signal Y2 across the first filter 11 and transmits it to control unit 6. Control unit 6 compares the differential pressure signal Y2 with the first differential pressure value W. If Y2 < W, control unit 6 activates regulating valve 21, gradually increasing the opening of regulating valve 21 to increase the flow rate into the second filter 7, thereby increasing the pressure at the outlet of the first filter 11. If Y2 > 0, control unit 6 continues to control the opening of regulating valve 21 to increase. If Y2 = 0, control unit 6 stops adjusting the opening of regulating valve 21, maintaining its current opening; pressure regulation is then complete. Figure 3 The arrows in the image indicate the direction of fluid flow during the filtration process.

[0068] The automatic flushing and pressure regulation method for filter pipelines in this invention acquires the differential pressure signal across the first filter via a pressure transmitter and uses a control unit to determine the clogging status of the first filter. Compared to existing technologies, this application solves the technical problem that existing technologies cannot automatically determine the clogging status of filters. This application eliminates the need for inspection by breaking open the pipeline, thus avoiding the risk of adding extraneous materials to the internal system, and particularly reducing the risk of water vapor entering liquid oxygen and liquid methane pipeline systems.

[0069] The above embodiments can be combined with each other and have corresponding technical effects.

[0070] The automatic flushing and pressure regulation method for filter pipelines of the present invention eliminates the need for inspection of the filter pipelines and filters for ruptures, and can automatically determine the filter blockage. This solves the problem that existing filters cannot automatically determine the blockage, avoids the risk of adding extraneous substances to the pipeline system, and especially reduces the risk of water vapor entering the liquid oxygen and liquid methane pipeline systems.

[0071] The automatic flushing and pressure regulation method for filter pipelines of the present invention can automatically clean the filter and corresponding pipelines without removing the filter from the pipeline system.

[0072] The automatic flushing and pressure regulation method for filter pipelines of the present invention can also compensate for the pressure loss after the fluid passes through the filter, solving the problem of pressure difference before and after the filter in the past, and can meet the test scenarios with strict requirements for fluid pressure loss.

[0073] All functions of this method can be automatically controlled, which greatly shortens the self-cleaning and filtration time, saves labor costs, and reduces the possibility of adding foreign matter into the pipeline system.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for automatic flushing and pressure regulating of a filter line, characterized in that, At least comprising: The filter pipeline is arranged between the upstream pipeline and the downstream pipeline; The first pressure difference value W and the second pressure difference value E are arranged on the control unit; The pressure difference signal Y1 between the filter pipeline inlet and outlet is continuously collected and transmitted to the control unit; The pressure difference signal Y1 and the first pressure difference value W are compared, if Y1≥W, the filter pipeline inlet is switched to the discharge pipeline by the control unit, the cleaning pipeline is connected to the filter pipeline outlet and then connected to the downstream pipeline, so that the fluid in the upstream pipeline at least partially enters the filter pipeline in reverse through the cleaning pipeline to flush it; The iterative pressure difference signal Y1 is continuously compared, if |Y1|<E, the cleaning pipeline is disconnected by the control unit, and the flushing is completed; The filter pipeline inlet is switched to the upstream pipeline by the control unit, and the pressure regulating pipeline is connected to the filter pipeline outlet and then connected to the downstream pipeline; The pressure difference signal Y2 between the filter pipeline inlet and outlet is continuously collected and transmitted to the control unit; The pressure difference signal Y2 and the first pressure difference value W are compared, if Y2W, the fluid flow of the pressure regulating pipeline is increased by the control unit to increase the pressure on the outlet side of the filter pipeline; The iterative pressure difference signal Y2 is continuously compared, if Y2=0, the fluid flow of the pressure regulating pipeline is stopped by the control unit to maintain the current opening, and the pressure regulation is completed.

2. The method of automatic flushing and pressure regulating of filter line according to claim 1, characterized in that, The filter pipeline is arranged between the upstream pipeline and the downstream pipeline, specifically: A first filter is installed in the filter pipeline, the inlet of which is connected to two pipelines, the first pipeline is connected to the upstream pipeline through the first electromagnetic valve, and the second pipeline is connected to the discharge pipeline with the second electromagnetic valve; pressure transmitters are arranged at both ends of the first filter for collecting pressure difference, and the outlet of the first filter is connected to the downstream pipeline; The pressure regulating pipeline and the cleaning pipeline are arranged in parallel, and the inlets of the pressure regulating pipeline and the cleaning pipeline are connected to the upstream pipeline, and the outlets are connected to the outlet of the first filter and then connected to the downstream pipeline.

3. The method of automatic flushing and pressure regulating of filter line according to claim 2, characterized in that, The method for switching the filter pipeline inlet to the discharge pipeline by the control unit is: The first electromagnetic valve is closed and the second electromagnetic valve is opened by the control unit, so that the inlet of the first filter is connected to the discharge pipeline through the second pipeline and the second electromagnetic valve.

4. The method of automatic flushing and pressure regulating of filter line according to claim 3, characterized in that, Before the control unit stops controlling the liquid flow of the pressure regulating pipeline, it further includes: The iterative pressure difference signal Y2 is continuously compared, if Y2>0, the control unit continues to control the liquid flow of the adjusting pipeline to increase until Y2=0.

5. The method of automatic flushing and pressure regulating of filter line according to claim 4, characterized in that, The first pressure difference value W is greater than the second pressure difference value E.

6. The method of automatic flushing and pressure regulating of filter circuits according to any one of claims 2 to 5, characterized in that, The pressure transmitters are arranged at both ends of the first filter for detecting the pressure difference between the inlet and outlet of the fluid after passing through the filter.

7. The method of automatic flushing and pressure regulating of filter line according to claim 6, characterized in that, The pressure regulating pipeline at least includes an adjusting valve, and the adjusting valve opening is adjusted by the control unit during the filtering process, so that the pressure difference between the inlet and outlet of the first filter can be adjusted.

8. The method of automatic flushing and pressure regulating of filter line according to claim 7, characterized in that, The cleaning pipeline comprises at least a booster pump; in the cleaning process, the booster pump is started and the regulating valve is closed by the control unit, the fluid in the upstream pipeline is pressurized by the booster pump of the cleaning pipeline and then enters the first filter outlet, so that the pressure on the side of the first filter outlet is greater than the pressure on the inlet side, and then at least part of the fluid reversely enters the first filter for reverse cleaning.

9. The method of automatic flushing and pressure regulating of filter line according to claim 8, characterized in that, The booster pump is connected in parallel with the regulating valve, one side of which is connected with the upstream pipeline, and the other side is connected in series with the inlet of the second filter, the outlet of the second filter is connected with the first filter outlet through a pipeline, and then connected with the downstream pipeline. The inlet of the regulating valve and the inlet of the booster pump are respectively connected with the upstream pipeline through a pipeline.

10. The method of automatic flushing and pressure regulating of filter lines according to claim 9, characterized in that, The first filter and the second filter have the same precision.

Images