Tubular filtering device and method for filtering by using same

Abstract

The present invention relates to the technical field of industrial production, and provides a tubular filtration device and a filtration method using the same, the tubular filtration device comprises: a mud collection cone cylinder, which comprises a cylinder main body and a bottom cone, the side surface of the cylinder main body is provided with a liquid inlet, and the gathering position of the bottom cone is provided with a mud discharge port; the single-tube filters are detachably installed on the upper portion of the cylinder body, the inlet ends of the single-tube filters are connected with the upper end of the cylinder body, liquid inlet valves and liquid inlet pressure gauges are arranged between the inlet ends of the single-tube filters and the upper end of the cylinder body, and liquid outlet valves and liquid outlet pressure gauges are arranged at the outlet ends of the single-tube filters. According to the scheme, the problem that a large amount of qualified filtrate is polluted due to the fact that faults and replacement of the tubular filtering device cannot be confirmed in time is solved, when the faulted single-tube filter needs to be replaced, the faulted single-tube filter only needs to be detached from the upper portion of the barrel body to be replaced, production pause is not needed, the filtering efficiency is improved, and the production cost is reduced. And the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of industrial production, and in particular to a tubular filtering device and a filtering method using the same. Background Art

[0002] In industrial production, many liquid raw materials need to be strictly purified before they can be used in subsequent reaction processes. Tubular filtration devices can effectively remove impurity particles, suspended matter, etc. in liquid raw materials and improve the purity of raw materials. For example, in the production process of titanium tetrachloride, the gaseous titanium tetrachloride produced by chlorination contains a large number of solid particles. After condensation and collection, the crude titanium tetrachloride liquid still contains a lot of solid particles. These solid particles will have a great impact on the quality of the product and are generally filtered through tubular filtration devices.

[0003] If the existing tubular filter device is damaged, it is difficult to detect it in time. The damage of the filter element is judged by the clarity of the filtered liquid. When the filtered liquid becomes turbid, it means that the device is damaged. Since it is impossible to confirm the failure of the tubular filter device and replace it in time, a large amount of qualified filtrate is contaminated. Therefore, it must be re-filtered, which increases the filtration time. At the same time, when replacing the filter element, production needs to be suspended and resumed after the replacement is completed, which reduces the filtration efficiency and increases the production cost.

[0004] Based on this, the existing technology is in urgent need of improvement. Summary of the invention

[0005] In view of this, in view of the problem that in the prior art it is impossible to promptly confirm the failure of a tubular filter device and to replace it, resulting in a large amount of qualified filtrate being contaminated and having to be re-filtered, which increases the filtration time. When replacing the filter element, production needs to be suspended and then resumed after the replacement is completed, which reduces the filtration efficiency and increases the production cost. The present disclosure provides a tubular filter device and a method for filtering using the same.

[0006] According to a first aspect of the present invention, there is provided a tubular filter device, comprising: The mud collecting cone cylinder comprises a cylinder body and a bottom cone, wherein the side of the cylinder body is provided with a liquid inlet, and the bottom cone is provided with a mud discharge port at the closing part; A plurality of single-tube filters are detachably mounted on the upper part of the cartridge body, wherein the inlet end of the single-tube filter is connected to the upper end of the cartridge body and a liquid inlet valve and a liquid inlet pressure gauge are arranged between the two, and the outlet end of the single-tube filter is provided with a liquid outlet valve and a liquid outlet pressure gauge.

[0007] In some embodiments, the inlet end of the single-tube filter is connected to the upper end of the cartridge body through an inlet pipe.

[0008] In some embodiments, the inlet pipe is connected to the inlet end of the single-tube filter and the upper end of the cartridge body respectively through threads.

[0009] In some embodiments, the inlet pipe is connected to the inlet end of the single-tube filter and the upper end of the cartridge body through flanges, respectively.

[0010] In some embodiments, the liquid inlet valve is installed on the inlet pipe, and the liquid inlet pressure gauge is connected to the inlet pipe via a first pressure-leading pipe externally connected to the inlet pipe.

[0011] In some embodiments, the liquid inlet valve is installed on the inlet pipe at a position close to the upper end of the cartridge body, and the liquid inlet pressure gauge is installed at a position close to the inlet end of the single-tube filter.

[0012] In some embodiments, the outlet end of the single-tube filter is connected to an outlet pipe, the liquid outlet valve is installed on the outlet pipe, and the liquid outlet pressure gauge is connected to the outlet pipe through a second pressure-guiding pipe connected to the outlet pipe.

[0013] In some embodiments, the liquid outlet pressure gauge is installed at a position close to the outlet end of the single-tube filter, and the liquid outlet valve is installed at a position on the outlet pipe away from the outlet end of the single-tube filter.

[0014] In some embodiments, the mud discharge port is welded at the retracted position of the bottom cone.

[0015] According to a second aspect of the present invention, there is provided a method for filtering using a tubular filtering device, comprising: Open the liquid inlet valve and the liquid outlet valve of each single-tube filter of the tubular filtering device, and open and initialize the liquid inlet pressure gauge and the liquid outlet pressure gauge of each single-tube filter; Connect the liquid inlet to an external input pipe and let the liquid to be filtered in; Monitor the pressure values ​​corresponding to the liquid inlet pressure gauge and the liquid outlet pressure gauge respectively and calculate the pressure difference between the two; Determine whether the pressure difference is within the normal range, and close the liquid inlet valve and the liquid outlet valve of the faulty single-tube filter whose pressure value is not within the normal range, and then disassemble it for replacement; The filtered liquid is collected from the outlet of the un-failed single-tube filter, and the filtered solid particles are collected from the mud outlet.

[0016] The above-mentioned tubular filter device and the method for filtering using the same, the tubular filter device includes a mud collecting cone cylinder, the mud collecting cone cylinder includes a cylinder body and a bottom cone, the side of the cylinder body has a liquid inlet, and the bottom cone has a mud outlet; it also includes a plurality of single-tube filters detachably mounted on the upper part of the cylinder body, the inlet end of the single-tube filter is connected to the upper end of the cylinder body and a liquid inlet valve and a liquid inlet pressure gauge are arranged between the two, and the outlet end of the single-tube filter is provided with a liquid outlet valve and a liquid outlet pressure gauge. Through the liquid inlet valve arranged between the inlet end of the single-tube filter and the cylinder body and the liquid outlet valve and the liquid outlet pressure gauge arranged at the outlet end of the single-tube filter, the faulty single-tube filter is timely monitored according to the state change of the pressure value of the pressure gauge so as to be replaced in time, reducing the problem of a large amount of qualified filtrate being contaminated due to the inability to timely confirm the fault of the tubular filter device and replace it, when the faulty single-tube filter needs to be replaced, it only needs to be disassembled from the upper part of the cylinder body for replacement without production suspension, thereby improving the filtering efficiency and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a tubular filter device provided in one embodiment of the present invention; Figure 2 A flow chart of a filtering method using a tubular filtering device is provided according to another embodiment of the present invention.

[0019] The reference numerals are as follows: 1. Cylinder body; 2. Liquid inlet valve; 3. Liquid inlet pressure gauge; 4. Single tube filter; 5. Liquid outlet pressure gauge; 6. Liquid outlet valve; 7. Bottom cone; 8. Mud outlet; 9. First pressure-guiding pipe; 10. Second pressure-guiding pipe; 11. Inlet pipe; 12. Outlet pipe; 100. Tubular filter device; 101. Mud collecting cone. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0021] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0022] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] In addition, the words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0024] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0025] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0026] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0027] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to appreciate that multiple modifications are feasible without actually departing from the teaching of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0028] Please refer to Figure 1 , Figure 1 The structure diagram of a tubular filter device provided by an embodiment of the present invention is shown. A tubular filter device 100 includes a mud collecting cone 101, which includes a cylinder body 1 and a bottom cone 7, wherein the side of the cylinder body 1 has a liquid inlet, and the bottom of the cone 7 has a mud outlet 8, and the bottom cone 7 is used to collect the filtered solid particles and discharge them from the mud outlet 8. The tubular filter device 100 also includes a plurality of single-tube filters 4 detachably mounted on the upper part of the cylinder body 1, Figure 1 4 single-tube filters 4 are shown in the figure, and the number of single-tube filters 4 can be one or more. The inlet end of each single-tube filter 4 is connected to the upper end of the cartridge body 1, and an inlet valve 2 and an inlet pressure gauge 3 are arranged between the inlet end of the single-tube filter 4 and the upper end of the cartridge body 1, and an outlet valve 6 and an outlet pressure gauge 5 are arranged at the outlet end of the single-tube filter 4. The inlet valve 2 is used to open or close the inlet of the single-tube filter, and the inlet pressure gauge 3 is used to monitor the inlet pressure of the inlet of the single-tube filter 4. The outlet valve 6 is used to open or close the outlet of the single-tube filter 4, and the outlet pressure gauge 5 is used to monitor the outlet pressure of the inlet of the single-tube filter 4. The number of the inlet pressure gauge 3 and the outlet pressure gauge 5 is not limited to one, and can be multiple. The pressure difference is calculated by the pressure values ​​respectively displayed by the inlet pressure gauge 3 and the outlet pressure gauge 5, and whether the corresponding single-tube filter 4 fails is determined by judging whether the pressure difference is within the normal range. If the filter element of the single-tube filter 4 fails, the pressure difference is not within the normal range, so that the faulty single-tube filter 4 is confirmed in time, which is conducive to ensuring the timely confirmation of the failure of the tubular filter device and replacement, and avoiding the problem of a large amount of qualified filtrate being contaminated due to the failure of the tubular filter device to be confirmed and replaced in time. At the same time, since the single-tube filter 4 is detachably installed on the upper part of the barrel body 1, if the faulty single-tube filter 4 needs to be replaced, it only needs to be removed from the upper part of the barrel body 1 for replacement, which improves the filtering efficiency and reduces the production cost.

[0029] Among them, the type of the single-tube filter is an existing single-tube filter that is convenient for quick replacement of the filter element. The types of the liquid inlet valve 2 and the liquid outlet valve 6 can be selected as manual, pneumatic or electric valves, etc. The liquid inlet pressure gauge 3 and the liquid outlet pressure gauge 5 can select remote online pressure detection instruments. When the liquid inlet pressure gauge 3 and the liquid outlet pressure gauge 5 are remote online pressure detection instruments, and the liquid inlet valve 2 and the liquid outlet valve 6 are pneumatic or electric valves, the two can be linked with the remote pressure detection device, that is, when the filter element of the single-tube filter 4 fails, the remote pressure detection device remotely monitors that the pressure difference between the liquid inlet pressure gauge 3 and the liquid outlet pressure gauge 5 is not within the normal range, and the remote pressure detection device outputs a cut-off signal to the liquid inlet valve 2 and the liquid outlet valve 6, thereby realizing automatic cut-off and avoiding the problem of qualified filtrate being contaminated.

[0030] Please continue to refer to Figure 1 The inlet end of the single-tube filter 4 is connected to the upper end of the cartridge body 1 through the inlet pipe 11. Since the inlet pipe 11 can have a certain length and direction adjustment space, it is beneficial for the single-tube filter 4 and the cartridge body 1 to be flexibly arranged according to the actual production site, such as flexibly adjusting the number of single-tube filters 4.

[0031] Please continue to refer to Figure 1 The liquid inlet valve 2 is installed on the inlet pipe 11, and the liquid inlet pressure gauge 3 is connected to the inlet pipe 11 through the first pressure-introducing pipe 9 externally connected to the inlet pipe 11. The liquid inlet pressure gauge 3 is connected to the inlet pipe 11 through the first pressure-introducing pipe 9, which helps to conveniently read the inlet pressure of the single-tube filter 4.

[0032] Please continue to refer to Figure 1 The liquid inlet valve 2 is installed on the inlet pipe 11 at a position close to the upper end of the cylinder body 1, and the liquid inlet pressure gauge 3 is installed at a position close to the inlet end of the single tube filter 4. Compared with the installation position of the liquid inlet valve 2, the installation position of the liquid inlet pressure gauge 3 is closer to the inlet end of the single tube filter 4, which helps to read the liquid inlet pressure of the single tube filter 4 more accurately.

[0033] Please continue to refer to Figure 1 The outlet end of the single-tube filter 4 is connected to an outlet pipe 12, the outlet valve 6 is installed on the outlet pipe 12, and the outlet pressure gauge 5 is connected to the outlet pipe 12 through the second pressure-inducing pipe 10 connected to the outlet pipe 12. The outlet pressure gauge 5 is connected to the outlet pipe 12 through the second pressure-inducing pipe 10, which helps to easily read the outlet pressure of the single-tube filter 4.

[0034] Please continue to refer to Figure 1The outlet pressure gauge 5 is installed at a position close to the outlet end of the single tube filter 4, and the outlet valve 6 is installed at a position on the outlet pipe 12 away from the outlet end of the single tube filter 4. Compared with the installation position of the outlet valve 6, the installation position of the outlet pressure gauge 5 is closer to the outlet end of the single tube filter 4, which helps to read the outlet pressure of the single tube filter 4 more accurately.

[0035] Please continue to refer to Figure 1 The mud discharge port 8 is welded at the retracted position of the bottom cone 7. The mud discharge port 8 is welded at the retracted position of the bottom cone 7, and under the action of gravity, the filtered solid particles can be discharged from the filter device to the greatest extent.

[0036] According to some embodiments of the present invention, the inlet pipe is connected to the inlet end of the single-tube filter 4 and the upper end of the cartridge body 1 respectively by threads. Threaded connection is a universal connection method, which enables the inlet pipe to be connected to the single-tube filter 4 and the cartridge body 1 of different specifications and models, and has good compatibility.

[0037] According to some embodiments of the present invention, the inlet pipe is connected to the inlet end of the single-tube filter 4 and the upper end of the cartridge body 1 by flanges. The flange connection can be conveniently connected to other equipment, such as pumps, valves, instruments, etc. By using a standard flange interface, a seamless connection can be achieved, which helps to improve the sealing of the device.

[0038] The above-mentioned tubular filtering device, through the liquid inlet valve 2 set between the inlet end of the single-tube filter 4 and the cartridge body 1, and the liquid outlet valve 6 and the liquid outlet pressure gauge 5 set at the outlet end of the single-tube filter 4, timely monitors the faulty single-tube filter 4 according to the state change of the pressure value of the pressure gauge, so as to replace it in time, thereby reducing the problem of a large amount of qualified filtrate being contaminated due to the inability to timely confirm the failure of the tubular filtering device and replace it. When the faulty single-tube filter 4 needs to be replaced, it only needs to be removed from the upper part of the cartridge body 1 for replacement without suspending production, thereby improving the filtering efficiency and reducing the production cost.

[0039] According to a second aspect of the present invention, there is provided a method for filtering using a tubular filter device, comprising: step a, opening the liquid inlet valve and the liquid outlet valve of each single-tube filter of the tubular filter device, and opening and initializing the liquid inlet pressure gauge and the liquid outlet pressure gauge of each single-tube filter; step b, connecting the liquid inlet to an input pipe, and passing the liquid to be filtered; step c, monitoring the pressure values ​​corresponding to the liquid inlet pressure gauge and the liquid outlet pressure gauge, respectively, and calculating the pressure difference between the two; step d, judging whether the pressure difference is within a normal range, and closing the liquid inlet valve and the liquid outlet valve of a faulty single-tube filter whose pressure value is not within the normal range, and removing them for replacement; step e, collecting the filtered liquid from the outlet end of the normal single-tube filter, and collecting the filtered solid particles from the mud outlet.

[0040] In a specific embodiment, the liquid inlet valve and the liquid outlet valve, as well as the liquid inlet pressure gauge and the liquid outlet pressure gauge are all controlled on site. First, the liquid inlet valve and the liquid outlet valve of each tube filter are opened, and the liquid inlet pressure gauge and the liquid outlet pressure gauge of each single-tube filter are opened and initialized to ensure that the pointers of the liquid inlet pressure gauge and the liquid outlet pressure gauge are zeroed. The liquid to be filtered (coarse liquid) is input into the liquid inlet of the tubular filter device through the external pipeline of the liquid inlet. During the operation of the tubular filter device, the operator patrols, observes the pressure values ​​displayed by the liquid inlet pressure gauge and the liquid outlet pressure gauge, and calculates the pressure difference. Under normal circumstances, the pressure difference corresponding to each single-tube filter of the tubular filter device is not much different. If the pressure difference of a single-tube filter is larger than the pressure difference of the remaining single-tube filters, it means that the single-tube filter may be faulty. At this time, it should be replaced in time to avoid the unfiltered coarse liquid from causing contamination of the filtered fine liquid. When replacing a faulty single-tube filter, it is only necessary to close the liquid inlet valve and the liquid outlet valve of the faulty single-tube filter, then remove it from the tubular filter device, and replace it with a new single-tube filter. The faulty single-tube filter of the tubular filter device can be quickly replaced without affecting the remaining non-faulty single-tube filters, and there is no need to stop the production of the tubular filter device for replacement, which ensures that the tubular filter device can still work normally while replacing the faulty single-tube filter, thereby improving the filtration efficiency, reducing the production cost, and effectively avoiding the adverse effects of coarse liquid on the fine liquid after filtration, which is beneficial to improving the filtration quality.

[0041] In another specific embodiment, the liquid inlet valve and the liquid outlet valve are pneumatic or electric valves, the liquid inlet pressure gauge and the liquid outlet pressure gauge are remotely controlled, and the liquid inlet valve and the liquid outlet valve, as well as the liquid inlet pressure gauge and the liquid outlet pressure gauge are online pressure detection instruments to achieve remote automatic control. When the tubular filter device is required to filter, the liquid inlet valve and the liquid outlet valve of each single-tube filter are remotely controlled to open automatically, and the liquid inlet pressure gauge and the liquid outlet pressure gauge of each single-tube filter are remotely opened and initialized at the same time, and the liquid to be filtered (coarse liquid) is input into the liquid inlet of the tubular filter device through the external pipeline of the liquid inlet, and the pressure values ​​of the remote online liquid inlet pressure gauge and the liquid outlet pressure gauge are centrally displayed on the control cabinet. Under normal circumstances, the pressure difference corresponding to each single-tube filter is not much different. When the pressure difference of one or two single tubular filters decreases sharply and is lower than the difference set by the program, it means that the filter element inside is damaged and needs to be replaced in time. At this time, the single-chip microcontroller (Microcontroller Unit, MCU) automatically outputs a shutdown signal, immediately closing the liquid inlet valve and liquid outlet valve of this single tubular filter, so as to quickly replace the damaged filter element without affecting the continued operation of the remaining single-tube filters. After the replacement is completed, the liquid inlet valve and liquid outlet valve of the replaced tubular filter are reopened on the control cabinet to continue normal production, thereby improving the filtration efficiency, reducing production costs, effectively avoiding the adverse effects of coarse liquid on the fine liquid after filtration, and helping to improve the filtration quality.

[0042] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0043] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A tubular filter device, characterized in that: include: The mud collecting cone cylinder comprises a cylinder body and a bottom cone, wherein the side of the cylinder body is provided with a liquid inlet, and the bottom cone is provided with a mud discharge port at the closing part; A plurality of single-tube filters are detachably mounted on the upper part of the cartridge body, wherein the inlet end of the single-tube filter is connected to the upper end of the cartridge body and a liquid inlet valve and a liquid inlet pressure gauge are arranged between the two, and the outlet end of the single-tube filter is provided with a liquid outlet valve and a liquid outlet pressure gauge.

2. The tubular filter device according to claim 1, characterized in that: The inlet end of the single-tube filter is connected to the upper end of the cartridge body through an inlet pipe.

3. The tubular filter device according to claim 2, characterized in that: The inlet pipe is connected to the inlet end of the single-tube filter and the upper end of the cartridge body through threads respectively.

4. The tubular filter device according to claim 2, characterized in that: The inlet pipe is connected to the inlet end of the single-tube filter and the upper end of the cartridge body through flanges respectively.

5. The tubular filter device according to claim 2, characterized in that: The liquid inlet valve is installed on the inlet pipeline, and the liquid inlet pressure gauge is connected to the inlet pipeline through a first pressure-guiding pipe externally connected to the inlet pipeline.

6. The tubular filter device according to claim 5, characterized in that: The liquid inlet valve is installed on the inlet pipeline at a position close to the upper end of the cylinder body, and the liquid inlet pressure gauge is installed at a position close to the inlet end of the single-tube filter.

7. The tubular filter device according to claim 1, characterized in that: The outlet end of the single-tube filter is externally connected to an outlet pipe, the liquid outlet valve is installed on the outlet pipe, and the liquid outlet pressure gauge is connected to the outlet pipe through a second pressure-guiding pipe externally connected to the outlet pipe.

8. The tubular filter device according to claim 7, characterized in that: The liquid outlet pressure gauge is installed at a position close to the outlet end of the single-tube filter, and the liquid outlet valve is installed at a position on the outlet pipe away from the outlet end of the single-tube filter.

9. The tubular filter device according to claim 1, characterized in that: The mud discharge port is welded at the retracted position of the bottom cone.

10. A filtration method using a tubular filtration device, characterized in that: Filtration using the tubular filtration device according to any one of claims 1 to 9 comprises: Open the liquid inlet valve and the liquid outlet valve of each single-tube filter of the tubular filtering device, and open and initialize the liquid inlet pressure gauge and the liquid outlet pressure gauge of each single-tube filter; Connect the liquid inlet to an external input pipe and let the liquid to be filtered in; Monitor the pressure values ​​corresponding to the liquid inlet pressure gauge and the liquid outlet pressure gauge respectively and calculate the pressure difference between the two; Determine whether the pressure difference is within the normal range, and close the liquid inlet valve and the liquid outlet valve of the faulty single-tube filter whose pressure value is not within the normal range, and then disassemble it for replacement; The filtered liquid is collected from the outlet of the un-failed single-tube filter, and the filtered solid particles are collected from the mud outlet.

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