Filter device and plunger-type double-switch laser filter

Abstract

The utility model discloses a filtering device and a plunger-type double-switch laser filter, and relates to the technical field of filters. A filtering device comprises: a filtering component, the filtering component comprises a filtering body and a laser microporous tube, the laser microporous tube is detachably connected to the filtering body, and the filtering body is provided with a feed port, a discharge port, and a storage cavity for storing impurities; a sewage valve connected to the bottom of the filtering body by a fastener, and the sewage valve is communicated with the storage cavity for storing impurities; a telescopic driving component, the fixed end of the telescopic driving component is connected to the top of the filtering body; a scraper unit connected to the telescopic end of the telescopic driving component, the scraper unit is located at the center of the filtering body, and the scraper unit is movably sleeved in the interior of the laser microporous tube; wherein the feed port and the storage cavity for impurities are both communicated with the interior of the laser microporous tube, and the discharge port is communicated with the exterior of the laser microporous tube. Its filtering element is easy to clean online, does not affect continuous production, and can also reduce the cleaning cost of the filtering element.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering for continuous production of high-temperature and high-viscosity materials, in particular to a filtering device and a plunger-type double-switching laser filter. Background Art

[0002] A filter is a device used to remove impurities from process raw materials and is widely used in the fields of textiles, chemicals, and medicine.

[0003] The double-switch filter is a common filter, which is mainly used in continuous production lines to remove impurities in process raw materials. The production line does not stop when replacing the filter element to meet the production process requirements. The pressure difference between the inlet and outlet of the pipeline is used to determine whether the filter element has reached the end of its service life.

[0004] At present, the filter elements in the filter assembly of the double switch filter are all made of various structural styles of woven mesh, such as candle wick filter elements and disc filter plates. The filter elements made of such woven mesh cannot be cleaned online, and the single use cycle is only 3-4 hours, and up to 12 hours. Therefore, after the use cycle of the filter element is reached, the filter element can only be removed, and after a complex cleaning process, it can be put back for use. During this period, high cleaning costs and labor costs are incurred, and waste pollution is generated. When the number of cleanings exceeds 15 times, the filter element will be completely scrapped. Therefore, the overall service life of the filter element made of woven mesh is only 180 hours at most. Utility Model Content

[0005] In view of the above technical problems, the utility model provides a filtering device and a plunger-type double-switch laser filter, whose filtering element adopts laser-punched micropores to replace the conventional woven mesh to achieve the filtering effect, and the laser micropore tube is cleaned online by moving the scraper up and down without affecting continuous production, while reducing the cleaning cost of the filtering element.

[0006] In order to solve the above problems, the technical solution provided by the utility model is:

[0007] A filtering device, comprising:

[0008] A filter assembly, the filter assembly comprising a filter body and a laser microporous tube, the laser microporous tube being detachably connected to the filter body, and the filter body being provided with a feed inlet, a discharge outlet and a cavity for storing impurities;

[0009] A drain valve connected to the bottom of the filter body via a fastener, the drain valve being in communication with the cavity for storing impurities;

[0010] A telescopic drive assembly, wherein a fixed end of the telescopic drive assembly is connected to the top of the filter body;

[0011] A scraper unit connected to the telescopic end of the telescopic drive assembly, the scraper unit is located at the center of the filter body, and the scraper unit is movably sleeved inside the laser microporous tube;

[0012] The feed port and the impurity storage cavity are both connected to the interior of the laser microporous tube, and the discharge port is connected to the exterior of the laser microporous tube.

[0013] Optionally, the scraper unit comprises:

[0014] A push rod, one end of which is connected to the telescopic end of the telescopic drive assembly;

[0015] A scraper module is detachably connected to the other end of the push rod, and the scraper module is movably sleeved inside the laser microporous tube.

[0016] Optionally, the other end of the push rod is provided with a step portion, and the scraper module comprises:

[0017] A scraper disc sleeved on the other end of the push rod, one end of the scraper disc being in contact with the step portion;

[0018] A scraper disk cap threadedly connected to the other end of the push rod, the scraper disk cap in contact with the other end of the scraper disk;

[0019] Wherein, the scraper disc is movably sleeved inside the laser microporous tube.

[0020] Optionally, the filter body comprises:

[0021] Main body;

[0022] An end cap detachably connected to the main body;

[0023] Among them, the feed port is arranged on the end cover, the discharge port and the impurity storage cavity are both arranged on the main body, the laser microporous tube is detachably connected to the main body, and the fixed end of the telescopic drive assembly is connected to the end cover.

[0024] Optionally, the fixed end of the telescopic drive assembly and the end cover are connected via a plurality of connecting rods.

[0025] Optionally, the filter assembly further includes a support tube, wherein the support tube is sleeved on the outside of the laser microporous tube and connected to the inside of the filter body.

[0026] A plunger-type double-switchable laser filter, comprising two filtering devices, wherein the two filtering devices are respectively configured as a first filtering device and a second filtering device, and further comprising:

[0027] A feed three-way valve, wherein a first feed pipe of the feed three-way valve is connected to a feed port of the first filter device, a second feed pipe of the feed three-way valve is connected to a feed port of the second filter device, and a third feed pipe of the feed three-way valve is configured as a process pipeline inlet pipe;

[0028] A discharge three-way valve, wherein the first discharge pipe of the discharge three-way valve is connected to the discharge port of the first filter device, the second discharge pipe of the discharge three-way valve is connected to the discharge port of the second filter device, and the third discharge pipe of the discharge three-way valve is configured as a process pipeline outlet pipe.

[0029] Optionally, also include:

[0030] Heating jacket;

[0031] A heat-insulating outer cover wrapped around the heating jacket;

[0032] A frame connected to the thermal insulation cover;

[0033] Wherein, the first filtering device, the second filtering device, the feed three-way valve and the discharge three-way valve are all connected to the heating jacket.

[0034] Optionally, it also includes a pipe body and a heating system that are closed and connected in sequence, and the pipe body is located in the heating jacket.

[0035] Optionally, also include:

[0036] Two first fixing blocks and two second fixing blocks, both of which are fixedly connected to the heating jacket;

[0037] Two first tightening rods threadedly connected to the two first fixing blocks, the two first tightening rods respectively contacting the upper outer side and the lower outer side of the filter body of the first filter device;

[0038] Two second tightening rods are threadedly connected to the two second fixing blocks, and the two second tightening rods are respectively in contact with the upper outer side and the lower outer side of the filter body of the second filter device.

[0039] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0040] 1) The filter element of the present application uses laser micro-holes to replace conventional woven meshes to achieve filtering effects. When the pressure difference between the inlet and outlet of the process pipeline reaches the set value, the laser micro-hole tube is cleaned online by moving the scraper up and down. The scraped impurities are stored in the bottom cavity of the filter component. After the filter element is scraped clean, the filtering effect is restored to the initial state. This process does not affect continuous production. Therefore, during the entire process, the cleaning process of the filter element is eliminated, which reduces production costs and labor costs. The filter element can be directly replaced after being worn, and the overall service life is long;

[0041] 2) During cleaning, the telescopic drive assembly drives the scraper unit to move, and the scraper unit scrapes off the particulate impurities inside the laser microporous tube. Under the action of fluid pressure and gravity, the particulate impurities gather at the bottom of the filter body, thereby facilitating the self-cleaning of the laser microporous tube of the filter device of the present application. There is no need to disassemble the laser microporous tube during self-cleaning, thereby making the cleaning of the laser microporous tube of the filter device of the present application convenient and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is one of the structural schematic diagrams of a plunger-type double-switchable laser filter proposed in an embodiment of the utility model;

[0043] Figure 2 The second structural schematic diagram of a plunger-type double-switchable laser filter proposed in an embodiment of the utility model;

[0044] Figure 3 for Figure 1 Partial diagram of A in the middle;

[0045] Figure 4 A schematic diagram of the structure of the laser microporous tube and the support tube proposed in the embodiment of the utility model;

[0046] Figure 5 A schematic diagram of the structure of the filter assembly proposed in the embodiment of the utility model;

[0047] Figure 6 A schematic diagram of the structure of a scraper unit proposed in an embodiment of the utility model;

[0048] Figure 7 This is a schematic diagram of the structure of the sewage valve when it is opened according to the embodiment of the utility model;

[0049] Figure 8 This is a schematic diagram of the structure of the sewage valve when it is closed according to the embodiment of the utility model;

[0050] In the figure: 1, filter body; 11, feed port; 12, discharge port; 13, impurity storage cavity; 101, main body; 102, end cover; 2, laser microporous tube; 21, support tube; 3, drain valve; 4, telescopic drive assembly; 5, scraper unit; 51, push rod; 511, step portion; 52, scraper module; 521, scraper disk; 522, scraper disk cap; 6, connecting rod; 71, first filter device; 72, second filter device; 8, feed three Through valve; 81, first feed pipe; 82, second feed pipe; 83, third feed pipe; 9, discharge three-way valve; 91, first discharge pipe; 92, second discharge pipe; 93, third discharge pipe; 100, heating jacket; 110, insulation cover; 120, frame; 200, pipe body; 301, first fixing block; 302, second fixing block; 401, first tightening rod; 402, second tightening rod; 501, inlet pressure gauge; 502, outlet pressure gauge. DETAILED DESCRIPTION

[0051] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0052] Example 1

[0053] Combined with Figure 1-4 , this embodiment provides a filtering device, comprising:

[0054] The filter assembly comprises a filter body 1 and a laser microporous tube 2. The laser microporous tube 2 is detachably connected to the filter body 1. The filter body 1 is provided with a feed inlet 11, a discharge outlet 12 and a cavity 13 for storing impurities.

[0055] A drain valve 3 connected to the bottom of the filter body 1 via a fastener, the drain valve 3 being in communication with a chamber 13 for storing impurities;

[0056] A telescopic driving assembly 4, wherein a fixed end of the telescopic driving assembly 4 is connected to the top of the filter body 1;

[0057] A scraper unit 5 connected to the telescopic end of the telescopic drive assembly 4, the scraper unit 5 is located at the center of the filter body 1, and the scraper unit 5 is closely matched with the mechanical tolerance and movably sleeved inside the laser microporous tube 2;

[0058] The feed port 11 and the impurity storage cavity 13 are both connected to the interior of the laser microporous tube 2 , and the discharge port 12 is connected to the exterior of the laser microporous tube 2 .

[0059] Specifically, during filtering, the fluid enters the interior of the laser microporous tube 2 in the filter body 1 from the feed port 11. Under the action of the laser microporous tube 2, the particulate impurities in the fluid are blocked inside the laser microporous tube 2, and the fluid flows to the outside of the laser microporous tube 2 and the discharge port 12 in sequence; during cleaning, the telescopic drive assembly 4 drives the scraper unit 5 to move, and the scraper unit 5 scrapes off the particulate impurities inside the laser microporous tube 2. Under the action of fluid pressure and gravity, the particulate impurities gather at the bottom of the filter body 1, thereby facilitating the self-cleaning of the laser microporous tube 2 of the filter device of the present application, and there is no need to disassemble the laser microporous tube 2 during self-cleaning, thereby making the cleaning of the laser microporous tube 2 of the filter device of the present application convenient and simple; during sewage discharge, the feed port 11 and the sewage discharge valve 3 are opened, and the discharge port 12 is closed. Under the impact of the fluid, the particulate impurities located at the bottom of the filter body 1 are discharged through the impurity storage cavity 13.

[0060] Among them, the filter body 1 is used to form a feed port 11, a discharge port 12 and a cavity 13 for storing impurities, and is also used to carry the laser microporous tube 2, a drain valve 3, etc.; the telescopic drive component 4 is used to drive the scraper unit 5 to extend and retract, and the telescopic drive component 4 can be a hydraulic cylinder, a cylinder, etc., preferably a hydraulic cylinder; since the laser microporous tube 2 and the filter body 1 are detachably connected, when the laser microporous tube 2 reaches the end of its service life and is damaged, it is convenient to disassemble and replace the laser microporous tube 2 in time, but there is no need to disassemble the laser microporous tube 2 every time it is cleaned; since the mechanical tolerance of the scraper unit 5 is closely matched and movably sleeved inside the laser microporous tube 2, it is convenient to make the scraper unit 5 and the laser microporous tube 2 achieve close contact, so that the cleaning completeness of the laser microporous tube 2 is good, and the material of the scraper unit 5 and the laser microporous tube 2 is preferably mold steel.

[0061] Further, such as Figure 3 , the scraper unit 5 comprises:

[0062] A push rod 51, one end of which is connected to the telescopic end of the telescopic drive assembly 4;

[0063] The scraper module 52 is detachably connected to the other end of the push rod 51 , and the scraper module 52 is movably sleeved inside the laser microporous tube 2 with a close mechanical tolerance.

[0064] Specifically, the telescopic driving assembly 4 drives the scraper module 52 to telescope through the push rod 51 .

[0065] Further, such as Figure 3 The other end of the push rod 51 is provided with a step portion 511, and the scraper module 52 includes:

[0066] A scraper plate 521 is sleeved on the other end of the push rod 51, and one end of the scraper plate 521 is in contact with the step portion 511;

[0067] A scraper plate cap 522 threadedly connected to the other end of the push rod 51, the scraper plate cap 522 is in contact with the other end of the scraper plate 521;

[0068] The scraper disc 521 is tightly matched with the mechanical tolerance and is movably sleeved inside the laser microporous tube 2 .

[0069] Specifically, the step portion 511 and the scraper disk cap 522 are used to limit the scraper disk 521 in the axial direction.

[0070] Further, such as Figure 1 , the filter body 1 comprises:

[0071] Main body 101;

[0072] An end cover 102 detachably connected to the main body 101;

[0073] Among them, the feed port 11 is arranged on the end cover 102, the discharge port 12 and the impurity storage cavity 13 are both arranged on the main body 101, the laser microporous tube 2 is detachably connected to the main body 101, and the fixed end of the telescopic drive assembly 4 is connected to the end cover 102.

[0074] Specifically, the main body 101 and the end cover 102 are used to form the filter body 1 together.

[0075] Further, such as Figure 1 The fixed end of the telescopic driving assembly 4 and the end cover 102 are connected by a plurality of connecting rods 6 .

[0076] Specifically, the plurality of connecting rods 6 facilitates good connection stability between the fixed end of the telescopic drive assembly 4 and the end cover 102 . The specific number of the plurality of connecting rods 6 is not limited, and is preferably four, and the four connecting rods 6 are evenly distributed along the circumference of the end cover 102 .

[0077] Further, such as Figure 4 The filter assembly also includes a support tube 21 , which is sleeved on the outside of the laser microporous tube 2 and connected to the filter body 1 .

[0078] Specifically, the support tube 21 is used to support the laser microporous tube 2 and play a pressure-bearing role; the multiple micropores of the laser microporous tube 2 are opened by laser, which is convenient for ensuring high processing accuracy of the micropores.

[0079] This embodiment further provides a plunger-type double-switchable laser filter, comprising two filtering devices of this embodiment, the two filtering devices are respectively configured as a first filtering device 71 and a second filtering device 72, and further comprising:

[0080] A feed three-way valve 8, a first feed pipe 81 of the feed three-way valve 8 is connected to a feed port 11 of the first filter device 71, a second feed pipe 82 of the feed three-way valve 8 is connected to a feed port 11 of the second filter device 72, and a third feed pipe 83 of the feed three-way valve 8 is configured as a process pipeline inlet pipe;

[0081] The discharge three-way valve 9, the first discharge pipe 91 of the discharge three-way valve 9 is connected to the discharge port 12 of the first filter device 71, the second discharge pipe 92 of the discharge three-way valve 9 is connected to the discharge port 12 of the second filter device 72, and the third discharge pipe 93 of the discharge three-way valve 9 is configured as a process pipeline outlet pipe.

[0082] Specifically, during normal operation, the first filter device 71 and the second filter device 72 are both in a filtering state;

[0083] During cleaning, the telescopic drive assembly 4 of the filter device to be cleaned drives the scraper unit 5 to move, and the scraper unit 5 scrapes off the particulate impurities inside the laser microporous tube 2. Under the action of fluid pressure and gravity, the particulate impurities gather at the bottom of the filter body 1, so that the laser microporous tube 2 of the filter device of the present application can be self-cleaned. During cleaning, the first filter device 71 and the second filter device 72 are both in a filtering state, which does not affect normal filtering. It should be noted that the telescopic drive assembly 4 can be controlled to regularly drive the scraper unit 5 to move, thereby completing the cleaning, or a controller, an inlet pressure gauge 501 and an outlet pressure gauge 502 can be additionally provided, and the inlet pressure gauge 501, the outlet pressure gauge 502 and the telescopic drive assembly 4 are all electrically connected to the controller. When the controller detects that the pressure difference between the inlet and outlet of the filter body 1 exceeds a preset value (when there are more particulate impurities on the laser microporous tube 2, the pressure of the feed port 11 of the filter body 1 increases, and the pressure of the discharge port 12 remains unchanged, thereby causing the pressure difference to increase), the controller controls the telescopic drive assembly 4 to drive the scraper unit 5 to move, thereby completing the cleaning;

[0084] Assuming that the first filter device 71 needs to discharge sewage, the first feed pipe 81 and the sewage valve 3 are opened, and the first discharge pipe 91 is closed. Under the impact of the fluid, the particulate impurities at the bottom of the filter body 1 are discharged through the impurity storage cavity 13, and then the sewage valve 3 is closed to complete the sewage discharge, and then the first discharge pipe 91 is opened again to enter the normal filtering state. The operation when the second filter device 72 needs to discharge sewage is similar, and no further description is given;

[0085] Assuming that the first filter device 71 needs to replace the laser microporous tube 2, when the laser microporous tube 2 reaches its service life and is damaged (specifically, after repeated cleaning, the pressure difference between the inlet and outlet still does not decrease), close the first feed pipe 81 and the first discharge pipe 91, first lift out the first filter device 71, disassemble and replace the laser microporous tube 2 inside, and then reassemble the first filter device 71, and finally open the first feed pipe 81 and the first discharge pipe 91 to complete the replacement of the laser microporous tube 2, and then enter the normal filtering state. The operation when the second filter device 72 needs to replace the laser microporous tube 2 is similar, and no further description is given;

[0086] It should be noted that, since the present application has the first filter device 71 and the second filter device 72 filtering at the same time, when one of the filter devices needs to discharge sewage, replace the laser microporous tube 2, etc., the other filter device can filter normally without affecting the continuous production of the relevant production line.

[0087] Further, such as Figure 1-2 , also includes:

[0088] Heating jacket 100;

[0089] A heat-insulating outer cover 110 wrapped around the heating jacket 100;

[0090] A frame 120 connected to the heat-insulating outer cover 110;

[0091] The first filtering device, the second filtering device, the feed three-way valve 8 and the discharge three-way valve 9 are all connected to the heating jacket 100 .

[0092] Further, such as Figure 1-2 , and also includes a pipe body 200 and a heating system that are closed and connected in sequence, and the pipe body 200 is located in the heating jacket 100.

[0093] Specifically, the pipe body 200 and the heating system are used to circulate the heat transfer oil in the heating jacket 100, so as to realize cyclic heating of the heating jacket 100, the first filter device 71 and the second filter device 72, etc., and prevent the fluid from solidifying.

[0094] Further, such as Figure 1-2 , also includes:

[0095] Two first fixing blocks 301 and two second fixing blocks 302, both of which are fixedly connected to the heating jacket 100;

[0096] Two first tightening rods 401 are threadedly connected to the two first fixing blocks 301 , and the two first tightening rods 401 are in contact with the upper outer side and the lower outer side of the filter body 1 of the first filter device 71 , respectively;

[0097] The two second pressing rods 402 are threadedly connected to the two second fixing blocks 302 , and the two second pressing rods 402 are in contact with the upper outer side and the lower outer side of the filter body 1 of the second filter device 72 , respectively.

[0098] Specifically, the first tightening rod 401 cooperates with the first fixing block 301 to make the filter body 1 of the first filter device 71 and the heating jacket 100 in close contact, so as to prevent the filter body 1 of the first filter device 71 from shaking; the second tightening rod 402 cooperates with the second fixing block 302 to make the filter body 1 of the second filter device 72 and the heating jacket 100 in close contact, so as to prevent the filter body 1 of the second filter device 72 from shaking; since the two first tightening rods 401 are in contact with the upper outer side and the lower outer side of the filter body 1 of the first filter device 71 respectively, it is equivalent to that the two first tightening rods 401 are respectively used to tighten the feed port 11 and the discharge port 12 of the filter body 1 of the first filter device 71; since the two second tightening rods 402 are respectively in contact with the upper outer side and the lower outer side of the filter body 1 of the second filter device 72, it is equivalent to that the two second tightening rods 402 are respectively used to tighten the feed port 11 and the discharge port 12 of the filter body 1 of the second filter device 72.

[0099] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A filtering device, characterized in that: include: A filter assembly, the filter assembly comprising a filter body and a laser microporous tube, the laser microporous tube being detachably connected to the filter body, and the filter body being provided with a feed inlet, a discharge outlet and a cavity for storing impurities; A drain valve connected to the bottom of the filter body via a fastener, the drain valve being in communication with the cavity for storing impurities; A telescopic drive assembly, wherein a fixed end of the telescopic drive assembly is connected to the top of the filter body; A scraper unit connected to the telescopic end of the telescopic drive assembly, the scraper unit is located at the center of the filter body, and the scraper unit is movably sleeved inside the laser microporous tube; The feed port and the impurity storage cavity are both connected to the interior of the laser microporous tube, and the discharge port is connected to the exterior of the laser microporous tube.

2. A filtering device according to claim 1, characterized in that: The scraper unit comprises: A push rod, one end of which is connected to the telescopic end of the telescopic drive assembly; A scraper module is detachably connected to the other end of the push rod, and the scraper module is movably sleeved inside the laser microporous tube.

3. A filtering device according to claim 2, characterized in that: The other end of the push rod is provided with a step portion, and the scraper module comprises: A scraper disc sleeved on the other end of the push rod, one end of the scraper disc being in contact with the step portion; A scraper disk cap threadedly connected to the other end of the push rod, the scraper disk cap in contact with the other end of the scraper disk; Wherein, the scraper disc is movably sleeved inside the laser microporous tube.

4. A filtering device according to any one of claims 1 to 3, characterized in that: The filter body comprises: Main body; An end cap detachably connected to the main body; Among them, the feed port is arranged on the end cover, the discharge port and the impurity storage cavity are both arranged on the main body, the laser microporous tube is detachably connected to the main body, and the fixed end of the telescopic drive assembly is connected to the end cover.

5. A filtering device according to claim 4, characterized in that: The fixed end of the telescopic drive assembly and the end cover are connected via a plurality of connecting rods.

6. A filtering device according to any one of claims 1 to 3, characterized in that: The filter assembly also includes a support tube, which is sleeved on the outside of the laser microporous tube and connected to the filter body.

7. A plunger-type double-switchable laser filter, characterized in that: The method comprises two filtering devices according to any one of claims 1 to 6, wherein the two filtering devices are respectively configured as a first filtering device and a second filtering device, and further comprises: A feed three-way valve, wherein a first feed pipe of the feed three-way valve is connected to a feed port of the first filter device, a second feed pipe of the feed three-way valve is connected to a feed port of the second filter device, and a third feed pipe of the feed three-way valve is configured as a process pipeline inlet pipe; A discharge three-way valve, wherein the first discharge pipe of the discharge three-way valve is connected to the discharge port of the first filter device, the second discharge pipe of the discharge three-way valve is connected to the discharge port of the second filter device, and the third discharge pipe of the discharge three-way valve is configured as a process pipeline outlet pipe.

8. The plunger-type double-switchable laser filter according to claim 7, characterized in that: Also includes: Heating jacket; A heat-insulating outer cover wrapped around the heating jacket; A frame connected to the thermal insulation cover; Wherein, the first filtering device, the second filtering device, the feed three-way valve and the discharge three-way valve are all connected to the heating jacket.

9. The plunger-type double-switchable laser filter according to claim 8, characterized in that: It also includes a pipe body and a heating system that are closed and connected in sequence, and the pipe body is located in the heating jacket.

10. The plunger-type double-switchable laser filter according to claim 8, characterized in that: Also includes: Two first fixing blocks and two second fixing blocks, both of which are fixedly connected to the heating jacket; Two first tightening rods threadedly connected to the two first fixing blocks, the two first tightening rods respectively contacting the upper outer side and the lower outer side of the filter body of the first filter device; Two second tightening rods are threadedly connected to the two second fixing blocks, and the two second tightening rods are respectively in contact with the upper outer side and the lower outer side of the filter body of the second filter device.

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