Combined filter

Abstract

The utility model discloses a combined filter and relates to the technical field of filters. A combined filter comprises a first filter used for preliminarily filtering a solution; the liquid inlet end of the second filter is butted with the first filter, and the second filter is used for filtering the solution again; the partition plate is arranged between the first filter and the second filter, is used for respectively connecting and fixing the first filter and the second filter, and is also used for ensuring that the first filter and the second filter are not communicated. According to the utility model, the first filter and the second filter are connected, filter residues with larger particles are primarily filtered by the first filter, and filter residues with finer particles are filtered by the second filter, so that the problem of blockage of a filter element is avoided, the service life of the filter element is prolonged, and the frequency and the cost of replacing the filter element are reduced.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and specifically to a combined filter. Background Technology

[0002] In the field of natural gas purification, traditional purification units commonly employ amine desulfurization and triethylene glycol dehydration processes to treat natural gas. However, these processes face a common problem during implementation: the system solution is easily contaminated by solid impurities carried by upstream feed gas or by pipeline corrosion products. Simultaneously, the degradation of the solution within the system, as well as corrosion or erosion of equipment and pipelines, leads to the continuous accumulation of solid impurities within the system. The presence of these solid impurities not only directly contaminates the solution but also exacerbates the foaming tendency as the contamination deepens. Solution foaming is a phenomenon that seriously affects the stable operation of purification units; it can disrupt the entire natural gas purification process, thereby reducing the production efficiency and product quality of the purification plant.

[0003] To address this issue and ensure stable operation of purification units, the industry has widely adopted measures to reduce solution contamination and control foaming trends. In current practice, cloth filters are widely used in natural gas purification units to remove solid impurities from the system, thereby cleaning the solution. Traditional solution filtration designs typically include rich-liquid cloth filters, lean-liquid cloth filters, and activated carbon filters, all of which heavily utilize filter cartridges as the filtration medium.

[0004] While traditional filtration systems have addressed the problem of solution contamination to some extent, their inherent drawbacks cannot be ignored. First, the complex setup of these systems increases both construction and maintenance costs. Second, the frequent maintenance and replacement of filter cartridges significantly increases the workload for employees, while also extending their exposure time in toxic and hazardous environments, posing a potential threat to their health. Therefore, traditional filtration systems are cumbersome and inefficient in practical applications, failing to meet the demands of modern industry for rapid, efficient, and automated processing.

[0005] Furthermore, existing filters frequently suffer from filter cartridge clogging when processing solutions containing large amounts of large particulate impurities. Filter cartridge clogging not only severely impacts filtration efficiency but also significantly shortens the lifespan of the filter cartridge, increasing the frequency and cost of replacement. Therefore, developing a filter capable of efficiently and continuously removing solid impurities from solutions while avoiding cartridge clogging has become a pressing technical challenge in the field of natural gas purification. Utility Model Content

[0006] The technical problem to be solved by this utility model is that existing filters are costly, inefficient, and prone to clogging, and cannot efficiently and continuously remove solid impurities from solutions. The purpose is to provide a combined filter that solves the problem that existing filters are prone to clogging when processing solutions containing a large number of large particles, thus affecting the filtration effect and shortening the filter life.

[0007] This utility model is achieved through the following technical solution:

[0008] A combined filter, comprising

[0009] The first filter is used for preliminary filtration of the solution;

[0010] The second filter, with its inlet end connected to the outlet end of the first filter, is used to filter the solution again.

[0011] A partition is disposed between the first filter and the second filter to connect and fix the first filter and the second filter respectively, and to ensure that the sides of the first filter and the second filter are not connected.

[0012] As one possible design, the first filter includes a first outlet, a first inlet, and a first filtration section.

[0013] The first outlet is connected to the first filtration section and is used to output the solution filtered in the first filtration section.

[0014] The first inlet is connected to the first filtration section and is used to input the solution to be filtered into the first filtration section.

[0015] The first filtration section is connected to the first liquid outlet and the first liquid inlet, respectively, and is used for preliminary filtration of the solution.

[0016] As one possible design, the first filtration section includes an inlet chamber, a first filtration chamber, and a first filter element.

[0017] The liquid inlet chamber is connected to and communicates with the first filter chamber, and the inside of the liquid inlet chamber is hollow.

[0018] The first filter chamber is connected to the first liquid outlet. The interior of the first filter chamber is hollow and used to fill the first filter element.

[0019] The first filter element is filled into the first filter chamber.

[0020] As one possible design, the first filter described above also includes a second outlet and a cleaning valve.

[0021] The second outlet is connected to the first filtration section and is used to discharge the filtrate.

[0022] The cleaning valve is connected to the first outlet and the inlet of the second filter respectively, and is used to close the channel with the first filter section when cleaning the second filter.

[0023] As one possible design, the second filter includes a third outlet, a second inlet, and a second filtration section.

[0024] The third outlet is connected to the second filtration section and is used to output the solution after secondary filtration.

[0025] The second inlet is connected to the second filtration section and docked with the first filter, and is used to input the solution after primary filtration into the second filtration chamber;

[0026] The second filtration section is used for secondary filtration of the solution.

[0027] As one possible design, the second filtration section includes a drain chamber, a second filtration chamber, and a second filter element.

[0028] The drain chamber is connected to the second filtration chamber and to the third outlet for discharging the secondary filtrate.

[0029] The second filter chamber is connected to the second liquid inlet and is hollow inside, used to fill the second filter element;

[0030] The second filter element is filled into the second filter chamber for secondary filtration of the solution.

[0031] As one possible design, the aforementioned second filter also includes a recovery valve, a flushing valve, and a drain valve.

[0032] The recovery valve is connected to the third outlet for collecting the secondary filtrate;

[0033] The flushing valve is connected to the third outlet for injecting flushing fluid from the third outlet;

[0034] The drain valve is connected to the second inlet and is used to collect the flushing waste liquid discharged from the second inlet.

[0035] As one possible design, the filter described above also includes a filter cake collector.

[0036] A filter cake collector is installed inside the first filter to remove the filter cake.

[0037] As one possible design, the aforementioned filter cake collector includes a rotary telescopic motor, a drive conveying pipe, a guide pipe, a filter cake bin, and an automatic sewage pump.

[0038] The rotary telescopic motor is coaxially connected to the conveying pipe and is used to drive the conveying pipe to rotate and extend.

[0039] One end of the conveying pipe is inserted into the first filter and connected to the guide tube. It is used to drive the guide tube to rotate and to transport the filter residue in the guide tube to the filter residue bin.

[0040] A conduit is installed inside the first filter, and a filter cake channel is provided inside the conduit for sucking up the filter cake in the first filter.

[0041] The filter residue bin is located adjacent to the first filter and is connected to the drive conveying pipe for receiving filter residue;

[0042] An automatic sewage pump is connected to the filter cake bin to remove the filter cake.

[0043] As one possible design, the aforementioned filter cake collector also includes a suction nozzle.

[0044] There are multiple suction nozzles, which are distributed on the side wall of the conduit and connected to the filter cake channel of the conduit for suctioning filter cake.

[0045] As one possible design, the first and second filters described above are tightly fitted together by flanges and bolts and nuts.

[0046] As one possible design, the pore size of the second filter element is smaller than that of the first filter element.

[0047] As one possible design, the first liquid outlet and the first liquid inlet are respectively located at both ends of the first filter section.

[0048] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0049] This invention connects a first filter and a second filter. The first filter first filters out larger filter particles, and the second filter filters out finer filter particles, thus avoiding filter clogging, extending the service life of the filter, and reducing the frequency and cost of filter replacement. Attached Figure Description

[0050] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0051] Figure 1 This is a schematic diagram of the structure of a combined filter according to the present invention;

[0052] Figure 2 This is a partial structural schematic diagram of a combined filter according to the present invention;

[0053] Figure 3 This is a cross-sectional structural diagram of a combined filter according to the present invention.

[0054] The attached diagram shows the markings and corresponding component names:

[0055] 100 - First filter; 111 - Liquid inlet chamber; 112 - First filtration chamber; 113 - First liquid outlet; 114 - First filter element; 115 - Second liquid outlet; 116 - First liquid inlet; 117 - Cleaning valve;

[0056] 200 - Second filter; 211 - Drainage chamber; 212 - Second filtration chamber; 213 - Third outlet; 214 - Second inlet; 215 - Flushing valve; 216 - Recovery valve; 217 - Second filter element; 218 - Drain valve;

[0057] 300-partition;

[0058] 400 - Filter cake collector; 410 - Drive conveying pipe; 420 - Conduit pipe; 421 - Suction nozzle; 430 - Rotary telescopic motor; 440 - Filter cake bin; 450 - Automatic sewage pump. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0060] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0061] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0062] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Example

[0065] This embodiment provides a combined filter, such as Figures 1-3 As shown, the system includes a first filter 100, a second filter 200, and a partition 300. The pore size of the first filter 100 is larger than that of the second filter 200, and it is used for preliminary filtration of the solution to remove larger particulate impurities. The inlet end of the second filter 200 is connected to the first filter 100 for further fine filtration to remove smaller particulate impurities. This combined filtration mechanism ensures that the solution is purified more thoroughly and efficiently, thereby significantly improving the filtration effect. This combined filter design also has the advantages of simple operation and convenient maintenance. Users only need to pour the solution to be treated into the first filter 100 and then filter it according to the established process. Due to the combined design of the two filters, a single device can independently complete all the work of solution filtration and recovery, greatly reducing the dependence on other auxiliary equipment and simplifying the operation process. The partition 300 is set between the first filter 100 and the second filter 200. It is separated between the first filter 100 and the second filter 200 by screws, welding, or other fixing methods, which ensures that the two filters cannot be directly connected through their joints, thereby effectively preventing potential leakage or cross-contamination.

[0066] Preferably, the first filter 100 and the second filter 200 are securely fixed together by a tight fit of flanges and bolts and nuts. This not only ensures a physical tight connection between the two filters but also further enhances the stability and reliability of the entire filter system. During operation, this design enables the filters to withstand pressure and vibration under various working conditions, thereby ensuring their long-term stable operation and guaranteeing the continuity and reliability of the filtration effect.

[0067] In some embodiments, such as Figures 1-3 As shown, the first filter 100 includes a first outlet 113, a first inlet 116, and a first filter section. The first outlet 113 is connected to the first filter section and is preferably integrally formed, being cylindrical or other cylindrical in shape, for outputting the solution filtered in the first filter section; the first inlet 116 is connected to the first filter section and has the same shape as the first outlet 113, for inputting the solution to be filtered into the first filter section; the first filter section is connected to both the first outlet 113 and the first inlet 116, for preliminary filtration of the solution.

[0068] Preferably, the first liquid outlet 113 and the first liquid inlet 116 are respectively located at both ends of the first filtration section. More preferably, the first liquid outlet 113 is located at the lower end and the first liquid inlet 116 is located at the upper end to ensure sufficient filtration of the solution.

[0069] In some embodiments, such as Figures 1-3 As shown, the first filtration section includes an inlet chamber 111, a first filtration chamber 112, and a first filter element 114. The inlet chamber 111 is connected to and communicates with the first filtration chamber 112. The inlet chamber 111 is hollow and communicates with a first inlet port 116. It is preferably cylindrical in shape and is used to receive the solution to be filtered. It is connected to the first filtration chamber 112, allowing the solution to be filtered to be input into the first filtration chamber 112 for filtration. The first filtration chamber 112 is connected to a first outlet port 113 for outputting the filtered solution. The first filtration chamber 112 is hollow and is used to fill the first filter element 114. The first filter element 114 fills the first filtration chamber 112. In use, the solution is input from the first inlet port 116, passes through the inlet chamber 111 and the first filtration chamber 112, is filtered by the first filter element 114, and is discharged from the first outlet port 113.

[0070] In some embodiments, such as Figures 1-3As shown, the first filter 100 also includes a second outlet 115 and a cleaning valve 117. The second outlet 115 is connected to the first filter section, preferably located at the lower end of the first filter chamber 112 of the first filter section. If the liquid to be filtered has reached the predetermined filtration standard after the first filtration treatment, the first outlet 113 can be closed, and the second outlet 115 can be opened to discharge the filtered liquid for recycling. Normally, to ensure filtration effect, the liquid needs to be filtered twice. The second outlet 115 is normally closed to ensure the purity of the liquid and the filtration effect. The cleaning valve 117 is connected to the first outlet 113 and the inlet of the second filter 200 respectively through pipes, and is used to close the first filter section when cleaning the second filter 200. Specifically, by closing the pipe to the first outlet 113, the cleaning solution can be input from the inlet of the second filter 200 to rinse the second filter 200. Since the required filtration precision differs between the two filtration stages, the cleaning valve 117 helps remove traces of solution from the previous filtration stage, preventing these residues from adversely affecting subsequent filtration stages. Furthermore, during filtration, especially when the filtrate contains a significant amount of suspended solids or particles, the cleaning valve 117 can effectively prevent pipe blockage through regular cleaning operations, ensuring smooth liquid flow between filtration stages. This not only improves filtration efficiency but also guarantees filtration quality, enabling the entire filtration system to operate more stably and efficiently.

[0071] In some embodiments, such as Figures 1-3 As shown, the second filter 200 includes a third outlet 213, a second inlet 214, and a second filtration section. The third outlet 213 is connected to the second filtration section and is cylindrical in shape, used to output the solution after secondary filtration; the second inlet 214 is connected to the second filtration section and is connected to the first outlet 113 through a cleaning valve 117, used to input the solution after primary filtration into the second filtration chamber 212; the second filtration section is used to perform secondary filtration on the solution.

[0072] In some embodiments, such as Figures 1-3 As shown, the second filtration section includes a drain chamber 211, a second filtration chamber 212, and a second filter element 217. The drain chamber 211 is connected to the second filtration chamber 212, is hollow inside, and is connected to the third outlet 213 for discharging the secondary filtrate. The second filtration chamber 212 is connected to the second inlet 214, is hollow inside, and is used to fill the second filter element 217. It is connected to the drain chamber 211 so that the filtered solution can be input into the drain chamber 211. The second filter element 217 fills the second filtration chamber 212 for secondary filtration of the solution.

[0073] Preferably, the pore size of the second filter element 217 is smaller than that of the first filter element 114, which can achieve graded filtration.

[0074] In some embodiments, such as Figures 1-3 As shown, the second filter 200 also includes a recovery valve 216, a flushing valve 215, and a drain valve 218. The recovery valve 216 is connected to the third outlet 213 and is used to collect the secondary filtrate. When the second filter chamber 212 performs the second filtration operation, the recovery valve 216 and the flushing valve 117 will open simultaneously to facilitate filtration. The flushing valve 215 is connected to the third outlet 213. The flushing valve 215 and the recovery valve 216 are set in parallel, and only one is opened during use. When the second filter 200 needs to be flushed, the third outlet 213 can be used as the inlet, and the second inlet 214 can be used as the outlet, thereby collecting the flushing waste liquid discharged from the second inlet 214. The drain valve 218 is connected to the second inlet 214 by a pipe and is used to collect the flushing waste liquid discharged from the second inlet 214.

[0075] In some embodiments, such as Figures 1-3 As shown, the above-mentioned combined filter also includes a filter cake collector 400. Since a large amount of filter cake is generated during the initial filtration process, the first filter 100 needs to be cleaned. The filter cake collector 400 is installed inside the first filter 100 to remove the filter cake from the first filter 100. This can avoid operators frequently replacing the filter element, remove the filter cake regularly, protect the operators, and improve work efficiency.

[0076] In some embodiments, such as Figures 1-3 As shown, the filter cake collector 400 includes a rotary telescopic motor 430, a drive conveying pipe 410, a guide pipe 420, a filter cake bin 440, and an automatic sewage pump 450. A rotary telescopic motor 430 is coaxially connected to a drive conveying pipe 410, used to drive the drive conveying pipe 410 to rotate and extend, thereby driving the conduit 420 to rotate and extend. One end of the drive conveying pipe 410 is inserted into the first filter 100, specifically into the liquid inlet chamber 111. Its shape is preferably cylindrical, and it is connected to the conduit 420. It is used to drive the conduit 420 to rotate and extend, and to transport the filter residue in the conduit 420 to the filter residue bin 440. The conduit 420 is disposed in the first filter 100, specifically in the first filter chamber 112. A filter residue channel is provided in the conduit 420, which is connected to the drive conveying pipe 410, for sucking up the filter residue in the first filter 100. The filter residue bin 440 is disposed adjacent to the first filter 100 and is connected to the drive conveying pipe 410, and can receive the filter residue output from the drive conveying pipe 410. An automatic sewage pump 450 is connected to the filter residue bin 440, used to suck up the filter residue in the filter residue bin 440.

[0077] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A combination filter, characterized in that, The utility model provides a double filter device for solution, which comprises a first filter (100) for primary filtering of the solution, a second filter (200) for secondary filtering of the solution, and a partition (300) for connecting and fixing the first filter (100) and the second filter (200) and ensuring that the side of the first filter (100) is not communicated with the side of the second filter (200). The first filter (100) comprises a first outlet (113), a first inlet (116), and a first filtering section. The first outlet (113) is communicated with the first filtering section and is used for outputting the filtered solution in the first filtering section. The first inlet (116) is communicated with the first filtering section and is used for inputting the solution to be filtered into the first filtering section.

2. A combination filter according to claim 1, wherein The first filtering section is connected with the first outlet (113) and the first inlet (116) respectively and is used for primary filtering of the solution. The first filtering section comprises a liquid inlet cavity (111), a first filtering cavity (112), and a first filtering member (114). The liquid inlet cavity (111) is communicated with and connected to the first filtering cavity (112) and is hollow inside. The first filtering cavity (112) is connected with the first outlet (113) and is hollow inside and used for filling the first filtering member (114).

3. A combination filter according to claim 2, wherein The first filtering member (114) is filled in the first filtering cavity (112). The first filter (100) further comprises a second outlet (115) and a cleaning valve (117). The second outlet (115) is connected with the first filtering section and is used for discharging the filtered solution. The cleaning valve (117) is connected with the first outlet (113) and the liquid inlet end of the second filter (200) respectively and is used for closing the channel with the first filtering section when cleaning the second filter (200).

4. A combination filter according to claim 2, wherein The second filter (200) comprises a third outlet (213), a second inlet (214), and a second filtering section. The third outlet (213) is connected with the second filtering section and is used for outputting the secondary filtered solution. The second inlet (214) is connected with the second filtering section and is connected with the first filter (100) and is used for inputting the primary filtered solution into the second filtering cavity (212).

5. A combination filter according to claim 3, wherein The second filtering section is used for secondary filtering of the solution. The second filtering section comprises a liquid discharge cavity (211), a second filtering cavity (212), and a second filtering member (217). The liquid discharge cavity (211) is communicated with the second filtering cavity (212) and is connected with the third outlet (213) and is used for discharging the secondary filtered solution. The second filtering cavity (212) is connected with the second inlet (214) and is hollow inside and used for filling the second filtering member (217).

6. A combination filter according to claim 5, wherein The second filtering member (217) is filled in the second filtering cavity (212) and is used for secondary filtering of the solution. ​ ​ ​ 7. A combination filter according to claim 5 wherein, The second filter (200) further comprises a recovery valve (216), a flushing valve (215) and a blowdown valve (218), The recovery valve (216) is connected with the third liquid outlet (213) and used for collecting the secondary filtration liquid. The flushing valve (215) is connected with the third liquid outlet (213) and used for injecting the flushing liquid from the third liquid outlet (213). The blowdown valve (218) is connected with the second liquid inlet (214) and used for collecting the flushing waste liquid discharged from the second liquid inlet (214).

8. A combination filter according to claim 1 wherein, Further comprising a filter residue collector (400), The filter residue collector (400) is installed in the first filter (100) and used for sucking the filter residue.

9. A combination filter according to claim 8, wherein, The filter residue collector (400) comprises a rotary telescopic motor (430), a driving conveying pipe (410), a guide pipe (420), a filter residue bin (440) and an automatic blowdown pump (450), The rotary telescopic motor (430) is coaxially connected with the driving conveying pipe (410) and used for driving the driving conveying pipe (410) to rotate and telescope. One end of the driving conveying pipe (410) penetrates into the first filter (100) and communicates with the guide pipe (420), which is used for driving the guide pipe (420) to rotate and for conveying the filter residue in the guide pipe (420) to the filter residue bin (440). The guide pipe (420) is arranged in the first filter (100), and a filter residue channel is arranged in the guide pipe (420) and used for sucking the filter residue in the first filter (100). The filter residue bin (440) is arranged adjacent to the first filter (100) and communicates with the driving conveying pipe (410) and used for receiving the filter residue. The automatic blowdown pump (450) communicates with the filter residue bin (440) and used for sucking out the filter residue.

10. A combination filter according to claim 9, wherein The filter residue collector (400) further comprises a suction nozzle (421), The suction nozzle (421) is in plurality and is arranged on the side wall of the guide pipe (420) and communicates with the filter residue channel of the guide pipe (420) and used for sucking the filter residue.

11. A combination filter according to claim 1 wherein, The first filter (100) and the second filter (200) are tightly matched through the flange and the bolt and nut.

12. A combination filter according to claim 6 wherein, The filter hole diameter of the second filter element (217) is smaller than that of the first filter element (114).

13. A combination filter according to claim 2, wherein The first liquid outlet (113) and the first liquid inlet (116) are respectively arranged at two ends of the first filter section.

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