Multi-stage tubular filter

Abstract

The utility model relates to a multistage tubular filter which comprises a tubular shell, a first shell and a second shell which are arranged along the axial direction of the tubular shell, a first reducing joint is arranged at the top end of the first shell, an inlet joint is arranged at the top end of the first reducing joint, and a second reducing joint is arranged at the bottom end of the second shell. An outlet joint is arranged at the bottom end of the second reducing joint; each of the first shell and the second shell corresponds to one filtering unit, filtering holes / filtering gaps with different filtering capacities are formed in the peripheral side wall of each filtering unit, and the size of each filtering hole / filtering gap in the lower filtering unit is smaller than that of each filtering hole / filtering gap in the upper filtering unit; the guide assembly I is arranged at the first reducing joint; the second guide assembly is arranged between the first shell and the second shell; and the third guide assembly is arranged at the second reducer union. The filter is highly integrated during pipeline installation, the occupied space of equipment is reduced, maintenance is convenient, and the filtering effect of the filter is improved.

Description

Technical Field

[0001] The utility model relates to the field of filters, in particular to a multi-stage tube filter. Background Art

[0002] Filters are an essential device for conveying media, typically installed at the inlet of pressure reducing valves, pressure relief valves, constant water level valves, and other equipment. Filters have a filter unit with a certain size of filter mesh, which blocks impurities. Simply remove the detachable filter unit for cleaning or replacement, making it extremely easy to use and maintain.

[0003] In the related art, the filter includes a tank body, and a filtering unit is arranged in the tank body, which can only achieve a filtering effect of a certain precision. Therefore, the filtering effect of the filter needs to be improved. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a multi-stage tubular filter.

[0005] The multi-stage tubular filter provided in this application adopts the following technical solution:

[0006] A multi-stage tubular filter comprising:

[0007] A tubular housing, the tubular housing comprising a first housing and a second housing arranged along its own axial direction and connected to each other, the first housing having a first tubular reducer at its top end, an inlet connector at its top end, the inlet connector communicating with both the first reducer and the interior of the first housing, the second housing having a second tubular reducer at its bottom end, an outlet connector at its bottom end, the outlet connector communicating with both the second reducer and the interior of the second housing;

[0008] A filter unit, wherein each of the first housing and the second housing corresponds to a filter unit, and the peripheral side walls of the filter unit are provided with filter holes / filter gaps of different filtering capabilities, the filter holes / filter gaps on the lower filter unit are smaller than the filter holes / filter gaps on the upper filter unit, the top end of the filter unit is closed, and the bottom end of the filter unit is open;

[0009] A guide assembly 1, wherein the guide assembly 1 is arranged at the first reducer;

[0010] A second guide assembly, the second guide assembly being disposed between the first housing and the second housing;

[0011] The guide component three is arranged at the second reducer.

[0012] By adopting the above technical solution, the fluid enters the tubular housing from the inlet connector, passes through the first guide assembly and contacts the outer peripheral wall of the filter unit in the first housing, impurities are filtered on the outer peripheral wall of the filter unit in the first housing, the filtered fluid enters the interior of the filter unit in the first housing, passes through the second guide assembly and flows to the filter unit in the second housing, contacts the outer peripheral wall of the filter unit in the second housing, impurities are filtered on the outer peripheral wall of the filter unit in the second housing, the filtered fluid enters the interior of the filter unit in the second housing, passes through the third guide assembly and enters the outlet connector for outflow;

[0013] Since the size of the filter holes / gap on the filter unit located below is smaller than that on the filter unit located above, the filtering accuracy of the filter unit located below is higher, and the fluid can undergo multi-level precision filtration, thereby improving the filtering effect of the filter.

[0014] Furthermore, the first reducer is fixed to the first housing via a first connecting assembly, the second reducer is fixed to the second housing via a second connecting assembly, and the first housing and the second housing are welded;

[0015] The first connection assembly includes a first sealing joint and a first clamp. Two first sealing joints are provided along the axial direction of the first clamp. The two first sealing joints are respectively fixedly connected to one end of the first housing close to the first reducer and one end of the first reducer close to the first housing. The outer circumferential walls of the two first sealing joints are each provided with an annular first groove for the first clamp to be clamped. The axial ends of the first clamp are respectively clamped in the first grooves of the two first sealing joints.

[0016] A first sealing ring is embedded in the first clamp, and two axial ends of the first sealing ring are respectively in contact with the outer peripheral walls of the two first sealing joints;

[0017] The second connection assembly includes a second sealing joint and a second clamp. Two second sealing joints are provided along the axial direction of the second clamp. The two second sealing joints are respectively fixedly connected to one end of the second housing close to the second reducer and one end of the second reducer close to the second housing. An annular second groove for the second clamp to be clamped is formed on the outer circumferential wall of the two second sealing joints. The axial ends of the second clamp are respectively clamped in the second grooves of the two second sealing joints.

[0018] A second sealing ring is embedded in the second clamp, and two axial ends of the second sealing ring are respectively in contact with the outer peripheral walls of the two second sealing joints.

[0019] By adopting the above technical solution, when the filter needs to be replaced or cleaned after being used for a period of time, the corresponding first clamp or second clamp is opened, and the first reducer, the second reducer, and the unit housing can be removed, so that the filter unit that needs to be removed can be taken out, which is convenient to operate and improves the maintenance efficiency of the filter; the first sealing ring improves the sealing between the first housing and the first reducer; the second sealing ring improves the sealing between the second housing and the second reducer.

[0020] Furthermore, the guide assembly includes a guide cylinder and a guide ring plate. The top end of the guide cylinder is fixedly connected to the inner top wall of the first reducer. The guide cylinder is coaxial with and connected to the inlet joint. A plurality of flow holes are formed on the circumferential side wall of the guide cylinder at equal intervals along its circumference. The flow holes are arranged in multiple rows at equal intervals along the axial direction of the guide cylinder.

[0021] The guide ring plate 1 is fixedly connected to the bottom surface of the guide cylinder 1, the inner circumferential surface of the guide ring plate 1 is flush with the inner circumferential surface of the guide cylinder 1, the outer circumferential wall of the guide ring plate 1 is fixedly connected to the inner circumferential wall of the first sealing joint adjacent to the first reducer, and a plurality of second flow holes are formed on the top surface of the guide ring plate 1 at equal intervals along the circumference of the guide ring plate 1, and the second flow holes are located outside the filter unit;

[0022] The second guide assembly includes a first shielding ring plate, a second guide cylinder, and a second guide ring plate. The first shielding ring plate is disposed between the first shell and the second shell, and the first shielding ring plate is sealedly connected to both the first shell and the second shell.

[0023] The top end of the guide cylinder 2 is fixedly connected to the inner peripheral wall of the shielding ring plate 1, and the guide cylinder 2 is connected to the interiors of the two adjacent filter units. A plurality of flow holes 3 are equidistantly opened on the peripheral side wall of the guide cylinder 2 along its own circumference, and the flow holes 3 are arranged in multiple rows equidistantly along the axial direction of the guide cylinder 2;

[0024] The second guide ring plate is fixedly connected to the bottom surface of the second guide cylinder, the inner circumferential surface of the second guide ring plate is flush with the inner circumferential surface of the second guide cylinder, the outer circumferential wall of the second guide ring plate is fixedly connected to the inner circumferential wall of the second shell, and a plurality of fourth flow holes are formed on the top surface of the second guide ring plate at equal intervals along the circumference of the second guide ring plate, and the fourth flow holes are located outside the filter unit;

[0025] The guide assembly three includes a baffle ring plate two and a guide tube three. The outer peripheral wall of the baffle ring plate two is fixedly connected to the inner peripheral wall of the second sealing joint near the second reducer; the top end of the guide tube three is fixedly connected to the inner peripheral wall of the baffle ring plate two, and the bottom end of the guide tube three is fixedly connected to the inner bottom wall of the second reducer. The guide tube three is coaxial with and connected to the outlet joint.

[0026] By adopting the above technical solution, after the fluid enters the guide cylinder one from the inlet joint, due to the closed setting of the top end of the filter unit, the fluid flows from the flow hole one to the guide ring plate one and from the flow hole two to the filter unit in the first shell and from the outside of the filter unit to the inside of the filter unit, so that the impurities in the fluid are filtered on the outer peripheral wall of the filter unit in the first shell. Since the bottom end of the filter unit is open, under the blocking action of the shielding ring plate one, the fluid filtered by the filter unit in the first shell flows from the inside of the filter unit in the first shell to the guide cylinder two, and the fluid then flows from the flow hole three to the guide ring plate two and from the flow hole four to the filter unit in the second shell and from the outside of the filter unit to the inside of the filter unit for further filtration. Under the blocking action of the shielding ring plate two, the fluid finally flows from the guide cylinder three to the outlet joint and out of the filter.

[0027] Furthermore, a circular plate is coaxially connected to the top surface of each filter unit, the outer diameter of the circular plate is smaller than the outer diameter of the filter unit, a positioning portion is coaxially connected to the top surface of the circular plate, the outer diameter of the positioning portion is smaller than the outer diameter of the circular plate, and one end of the positioning portion away from the filter unit is tapered;

[0028] The positioning portion of the filter unit in the first housing penetrates into the first guide cylinder, and the positioning portion of the filter unit in the second housing penetrates into the adjacent second guide cylinder;

[0029] The bottom end of the filter unit is contracted inward to form a step 1, the step 1 of the filter unit in the first housing is placed on the shielding ring plate 1, and the step 1 of the filter unit in the second housing is placed on the shielding ring plate 2;

[0030] The bottom end of the step 1 is inwardly contracted to form a step 2. The step 2 of the filter unit in the first shell penetrates into the adjacent guide cylinder 2, and the step 2 of the filter unit in the second shell penetrates into the guide cylinder 3.

[0031] By adopting the above technical solution, the positioning portion and the second step cooperate to provide positioning for the installation of the filter unit, so that the filter unit is stably located in the unit housing.

[0032] Furthermore, a compensating elastic pad is sleeved on one end of the positioning portion close to the circular plate, the bottom surface of the compensating elastic pad abuts against the circular plate, the top surface of the compensating elastic pad of the filter unit in the first housing abuts against the bottom surface of the guide ring plate 1, and the top surface of the compensating elastic pad of the filter unit in the second housing abuts against the bottom surface of the guide ring plate 2;

[0033] An annular sealing groove is provided on the outer circumferential wall of the step 2 along its own circumference, and a sealing ring is embedded in the sealing groove. The sealing ring of the filter unit in the first shell is interference fit with the inner circumferential wall of the guide cylinder 2, and the sealing ring of the filter unit in the second shell is interference fit with the inner circumferential wall of the guide cylinder 3.

[0034] By adopting the above technical solution, when the fluid impacts the filter unit, the elastic compensation pad keeps the filter unit and the corresponding guide ring plate 1 and guide ring plate 2 sealed to ensure the filtering effect;

[0035] The sealing ring keeps the filter unit sealed with the corresponding guide cylinder 1 and guide cylinder 2 to further ensure the filtering effect.

[0036] Furthermore, a drain valve is provided on the tubular shell, and the drain valve is arranged on the first shell near the second shell.

[0037] By adopting the above technical solution, when the filter needs to be maintained, the drain valve is opened to discharge the fluid, and the filter can be disassembled.

[0038] Furthermore, the first shell is provided with a first pressure measuring interface communicating with the interior of the first shell, and the second shell is provided with a second pressure measuring interface communicating with the interior of the second shell. The first pressure measuring interface and the second pressure measuring interface are respectively connected to external pressure gauges.

[0039] By adopting the above technical solution, by observing the changes in the pressure difference between the two pressure gauges at the first pressure measuring interface and the second pressure measuring interface, it is detected whether the filter unit is blocked, so that the filter unit can be replaced or cleaned in time to ensure the filtering effect of the filter.

[0040] Furthermore, an overflow valve is provided on the shielding ring plate 1. After the overflow valve is opened, the first shell and the second shell are connected through the overflow valve.

[0041] By adopting the above technical solution, when the filter unit in the first shell is clogged and the filter still needs to be used, the overflow valve is opened to allow the fluid in the clogged filter unit to flow through the overflow valve to the next filter unit, so that the filter can still keep working, avoiding affecting the working efficiency of the system where the filter is located and affecting the economic benefits.

[0042] Furthermore, the tubular housing further comprises a third housing, the third housing being disposed between the first housing and the first reducer, and a filter unit being also disposed in the third housing;

[0043] The third housing is fixed to the first reducer via a third connecting assembly, and the third housing is fixed to the first housing via a fourth connecting assembly;

[0044] The third connection assembly includes a third sealing joint and a third clamp. Two third sealing joints are provided along the axial direction of the third clamp. The two third sealing joints are respectively fixedly connected to one end of the third housing close to the first reducer and one end of the first reducer close to the third housing. An annular third groove for the third clamp is provided on the outer circumferential wall of the two third sealing joints. The axial ends of the third clamp are respectively clamped in the third grooves of the two third sealing joints.

[0045] A third sealing ring is embedded in the third clamp, and the two axial ends of the third sealing ring are respectively in contact with the outer peripheral walls of the two third sealing joints;

[0046] The fourth connection assembly includes a fourth sealing joint and a fourth clamp. Two fourth sealing joints are provided along the axial direction of the fourth clamp. The two fourth sealing joints are respectively fixedly connected to one end of the third housing close to the first housing and one end of the first housing close to the third housing. The outer circumferential walls of the two fourth sealing joints are each provided with an annular fourth groove for the fourth clamp to be clamped. The axial ends of the fourth clamp are respectively clamped in the fourth grooves of the two fourth sealing joints.

[0047] A fourth sealing ring is embedded in the fourth clamp, and both axial ends of the fourth sealing ring are respectively in contact with the outer peripheral walls of the two fourth sealing joints;

[0048] A guide assembly 4 is provided between the third housing and the first housing, the guide assembly 4 comprising a shielding ring plate 3, a guide cylinder 4, and a guide ring plate 4. The shielding ring plate 3 is provided at the bottom end of the third housing, and the outer peripheral wall of the shielding ring plate 3 is fixedly connected to the inner peripheral wall of the third housing;

[0049] The top end of the guide cylinder 4 is fixedly connected to the inner peripheral wall of the shielding ring plate 3, and the guide cylinder 4 is connected to the interior of the two adjacent filter units. The peripheral side wall of the guide cylinder 4 is provided with a plurality of flow holes 5 at equal intervals along its own circumference. The flow holes 5 are arranged in multiple rows at equal intervals along the axial direction of the guide cylinder 4.

[0050] The guide ring plate 4 is fixedly connected to the bottom surface of the guide cylinder 4, the inner circumferential surface of the guide ring plate 4 is flush with the inner circumferential surface of the guide cylinder 4, the outer circumferential wall of the guide ring plate 4 is fixedly connected to the inner circumferential wall of the fourth sealing joint adjacent to the third housing, and a plurality of flow holes 6 are formed on the top surface of the guide ring plate 4 at equal intervals along the circumference of the guide ring plate 4, and the flow holes 6 are located outside the filter unit;

[0051] The fluid is guided between the third shell and the inlet joint through a pair of guide components, the positioning portion of the filter unit in the third shell penetrates into the guide cylinder one, and the positioning portion of the filter unit in the first shell penetrates into the guide cylinder four; the top surface of the compensation elastic pad of the filter unit in the third shell abuts against the bottom surface of the guide ring plate one, and the top surface of the compensation elastic pad of the filter unit in the first shell abuts against the bottom surface of the guide ring plate four; the step one of the filter unit in the third shell is placed on the shielding ring plate three, the step two of the filter unit in the third shell penetrates into the guide cylinder four, and the sealing ring of the filter unit in the third shell is interference fit with the inner circumferential wall of the guide cylinder four.

[0052] By adopting the above technical solution, the filtering effect is further improved.

[0053] Furthermore, the third shell is provided with a third pressure measuring interface communicating with the interior of the third shell, and the third pressure measuring interface is externally connected to a pressure gauge.

[0054] By adopting the above technical solution, by observing the changes in the pressure difference between the two pressure gauges at the third pressure measuring interface and the second pressure measuring interface, it is detected whether the filter unit is blocked, so that the filter unit can be replaced or cleaned in time to ensure the filtering effect of the filter.

[0055] In summary, this application includes at least one of the following beneficial technical effects:

[0056] 1. The fluid can be filtered through multiple levels of precision, which improves the filtering effect of the filter;

[0057] 2. When the filter unit needs to be replaced or cleaned, the first, second, third or fourth clamps can be removed to remove the filter unit to be removed. The operation is convenient and the maintenance efficiency of the filter is improved.

[0058] 3. By observing the changes in the pressure difference between the corresponding pressure gauges, it is possible to detect whether the filter unit is clogged, so that the filter unit can be replaced or cleaned in time to ensure the filtering effect of the filter;

[0059] 4. When the filter unit in the first housing is clogged and the filter still needs to be used, the overflow valve is opened to allow the fluid in the clogged filter unit to flow through the overflow valve to the next filter unit, so that the filter can still keep working, avoiding affecting the working efficiency of the system where the filter is located and affecting the economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 This is a schematic diagram of the overall cross-sectional structure of a multi-stage tubular filter in Example 1 of the present application, wherein the arrows indicate the flow direction of the fluid.

[0061] Figure 2 It is used to display the guide component one Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0062] Figure 3 It is used to display the second component of the guide Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0063] Figure 4 It is used to display the guide component three Figure 1 Schematic diagram of the enlarged structure at point C in the middle.

[0064] Figure 5 This is a schematic diagram of the overall cross-sectional structure of a multi-stage tubular filter in Example 2 of the present application.

[0065] Figure 6 It is used to display the third connection component Figure 5 Schematic diagram of the enlarged structure at point D in the middle.

[0066] Figure 7 It is used to display the fourth component of the guide Figure 1 Schematic diagram of the enlarged structure at E in the middle.

[0067] Description of reference numerals:

[0068] 1. Tubular housing; 11. First housing; 111. First pressure measuring interface; 12. Second housing; 121. Second pressure measuring interface; 13. Third housing; 131. Third connecting assembly; 1311. Third sealing joint; 1312. Third clamp; 1313. Third sealing ring; 132. Fourth connecting assembly; 1321. Fourth sealing joint; 1322. Fourth clamp; 1323. Fourth sealing ring; 133. Third pressure measuring interface;

[0069] 2. First reducer; 21. Inlet connector; 22. First connection assembly; 221. First sealing connector; 222. First clamp; 223. First sealing ring;

[0070] 3. Second reducer; 31. Outlet connector; 32. Second connection assembly; 321. Second sealing connector; 322. Second clamp; 323. Second sealing ring;

[0071] 4. Filter unit; 41. Circular plate; 42. Positioning portion; 421. Compensating elastic pad; 43. Step 1; 44. Step 2; 441. Sealing groove; 442. Sealing ring;

[0072] 5. Guide assembly 1; 51. Guide cylinder 1; 511. Flow hole 1; 52. Guide ring plate 1; 521. Flow hole 2;

[0073] 6. Guide assembly 2; 61. Blocking ring plate 1; 611. Overflow valve; 62. Guide cylinder 2; 621. Flow hole 3; 63. Guide ring plate 2; 631. Flow hole 4;

[0074] 7. Guide assembly three; 71. Blocking ring plate two; 72. Guide cylinder three;

[0075] 8. Drain valve;

[0076] 9. Guide assembly four; 91. Shielding ring plate three; 92. Guide cylinder four; 921. Flow hole five; 93. Guide ring plate four; 931. Flow hole six. DETAILED DESCRIPTION

[0077] The following is combined with Figure 1-7 This application is described in further detail.

[0078] Example 1

[0079] Embodiment 1 of the present application discloses a multi-stage tubular filter.

[0080] Reference Figure 1-4 The multi-stage tubular filter includes a tubular housing 1, which includes a first housing 11 and a second housing 12, which are arranged along the tubular housing 11 and connected to each other. A first tubular reducer 2 is provided at the top of the first housing 11. A tubular inlet connector 21 is provided at the top of the first reducer 2. The inlet connector 21 communicates with both the first reducer 2 and the interior of the first housing 11. A second tubular reducer 3 is provided at the bottom of the second housing 12. A tubular outlet connector 31 is provided at the bottom of the second reducer 3. The outlet connector 31 communicates with both the second reducer 3 and the interior of the second housing 12.

[0081] The first reducer 2 is fixed to the first housing 11 via a first connecting assembly 22 , the second reducer 3 is fixed to the second housing 12 via a second connecting assembly 32 , and the first housing 11 and the second housing 12 are welded.

[0082] Each of the first and second housings is provided with a filter unit 4. The sidewalls of the filter unit 4 are provided with filter holes / slots of varying filtration capabilities. The filter holes / slots in the lower filter unit 4 are smaller than those in the upper filter unit 4. The top end of the filter unit 4 is closed, while the bottom end is open.

[0083] A guide component 1 5 is provided at the first reducer 2 , a guide component 2 6 is provided between the first shell 11 and the second shell 12 , and a guide component 3 7 is provided at the second reducer 3 .

[0084] The fluid enters the tubular housing 1 from the inlet joint 21, and the fluid contacts the outer peripheral wall of the filter unit 4 in the first housing 11 through the guide component 1 5. Impurities are filtered on the outer peripheral wall of the filter unit 4 in the first housing 11. The filtered fluid enters the interior of the filter unit 4 in the first housing 11 and flows to the filter unit 4 in the second housing 12 through the guide component 2 6 and contacts the outer peripheral wall of the filter unit 4 in the second housing 12. Impurities are filtered on the outer peripheral wall of the filter unit 4 in the second housing 12. The filtered fluid enters the interior of the filter unit 4 in the second housing 12 and passes through the guide component 3 7 to enter the outlet joint 31 and flow out.

[0085] Since the size of the filter holes / gap on the filter unit 4 located below is smaller than the size of the filter holes / gap on the filter unit 4 located above, the filtering accuracy of the filter unit 4 located below is higher, and the fluid can undergo multi-level precision filtration, thereby improving the filtering effect of the filter.

[0086] The first connecting assembly 22 includes a first sealing joint 221 and a first clamp 222. Two first sealing joints 221 are arranged along the axial direction of the first clamp 222. The two first sealing joints 221 are respectively welded to one end of the first shell 11 close to the first reducer 2 and one end of the first reducer 2 close to the first shell 11. The outer peripheral walls of the two first sealing joints 221 are provided with an annular first groove for the first clamp 222 to be clamped. The axial ends of the first clamp 222 are respectively clamped in the first grooves of the two first sealing joints 221.

[0087] A first sealing ring 223 is embedded in the first clamp 222. The first sealing ring 223 is provided with an opening. The opening of the first sealing ring 223 corresponds to the opening of the first clamp 222. The two axial ends of the first sealing ring 223 respectively abut against the outer peripheral walls of the two first sealing joints 221 to improve the sealing between the first shell 11 and the first reducer 2.

[0088] The second connecting assembly 32 includes a second sealing joint 321 and a second clamp 322. Two second sealing joints 321 are arranged along the axial direction of the second clamp 322. The two second sealing joints 321 are respectively welded to one end of the second shell 12 close to the second reducer 3 and one end of the second reducer 3 close to the second shell 12. An annular second groove for clamping the second clamp 322 is provided on the outer peripheral wall of the two second sealing joints 321. The two axial ends of the second clamp 322 are respectively clamped in the second grooves of the two second sealing joints 321.

[0089] A second sealing ring 323 is embedded in the second clamp 322. The second sealing ring 323 is provided with an opening. The opening of the second sealing ring 323 corresponds to the opening of the second clamp 322. The two axial ends of the second sealing ring 323 respectively abut against the outer peripheral walls of the two second sealing joints 321 to improve the sealing between the second shell 12 and the second reducer 3.

[0090] When the filter unit 4 needs to be replaced or cleaned after being used for a period of time, the corresponding first clamp 222 or second clamp 322 is opened, and the first reducer 2, the second reducer 3, and the unit shell can be removed, so that the filter unit 4 that needs to be removed can be taken out, which is convenient to operate and improves the maintenance efficiency of the filter.

[0091] The guide assembly 5 comprises a guide cylinder 51 and a guide ring plate 52. The top end of the guide cylinder 51 is welded to the inner top wall of the first reducer 2. The guide cylinder 51 is coaxial with and connected to the inlet connector 21. The circumferential sidewall of the guide cylinder 51 is provided with a plurality of flow holes 511 equidistantly spaced along its circumference. The flow holes 511 are arranged in two rows of four equidistantly spaced along the axial direction of the guide cylinder 51. The guide ring plate 52 is welded to the bottom surface of the guide cylinder 51. The inner circumferential surface of the guide ring plate 52 is flush with that of the guide cylinder 51. The outer circumferential wall of the guide ring plate 52 is welded to the inner circumferential wall of the first sealing joint 221 adjacent to the first reducer 2. The top surface of the guide ring plate 52 is provided with four flow holes 521 equidistantly spaced along its circumference. The flow holes 521 are located outside the filter unit 4.

[0092] Guide assembly 2 (6) comprises a baffle plate 1 (61), a guide cylinder 2 (62), and a guide ring plate 2 (63). Baffle plate 1 (61) is positioned between the first and second housings 11, 12, and is sealed to both. The top of guide cylinder 2 (62) is welded to the inner circumference of baffle plate 1 (61). Guide cylinder 2 (62) communicates with the interiors of two adjacent filter units 4. Multiple flow holes 3 (621) are equidistantly spaced along the circumference of guide cylinder 2 (62). These holes 3 (621) are arranged in two rows of four, equidistantly along the axial direction of guide cylinder 2 (62). The guide ring plate 2 63 is welded to the bottom surface of the guide cylinder 2 62 , the inner circumferential surface of the guide ring plate 2 63 is flush with the inner circumferential surface of the guide cylinder 2 62 , the outer circumferential wall of the guide ring plate 2 63 is welded to the inner circumferential wall of the second shell 12 , and four flow holes 4 631 are equidistantly provided on the top surface of the guide ring plate 2 63 along the circumference of the guide ring plate 2 63 , and the flow holes 4 631 are located on the outside of the filter unit 4 .

[0093] The guide assembly three 7 includes a baffle ring plate two 71 and a guide tube three 72. The outer peripheral wall of the baffle ring plate two 71 is welded to the inner peripheral wall of the second sealing joint 321 close to the second reducer 3. The top end of the guide tube three 72 is welded to the inner peripheral wall of the baffle ring plate two 71. The bottom end of the guide tube three 72 is welded to the inner bottom wall of the second reducer 3. The guide tube three 72 is coaxial with and connected to the outlet joint 31.

[0094] After the fluid enters the guide cylinder 1 51 from the inlet joint 21, due to the closed setting of the top of the filter unit 4, the fluid flows from the flow hole 1 511 to the guide ring plate 1 52 and flows from the flow hole 2 521 to the filter unit 4 in the first shell 11, and flows from the outside of the filter unit 4 to the inside of the filter unit 4, so that the impurities in the fluid are filtered on the outer peripheral wall of the filter unit 4 in the first shell 11. Since the bottom end of the filter unit 4 is open, under the blocking action of the shielding ring plate 1 61, the fluid filtered by the filter unit 4 in the first shell 11 flows from the inside of the filter unit 4 in the first shell 11 to the guide cylinder 2 62, and the fluid then flows from the flow hole 3 621 to the guide ring plate 2 63 and flows from the flow hole 4 631 to the filter unit 4 in the second shell 12, and flows from the outside of the filter unit 4 to the inside of the filter unit 4 for further filtration. Under the blocking action of the shielding ring plate 2 71, the fluid finally flows from the guide cylinder 3 72 to the outlet joint 31 and flows out of the filter.

[0095] A circular plate 41 is coaxially connected to the top surface of each filter unit 4. The outer diameter of circular plate 41 is smaller than that of the filter unit 4. A positioning portion 42 is coaxially connected to the top surface of circular plate 41. The outer diameter of positioning portion 42 is smaller than that of circular plate 41, and the end of positioning portion 42 facing away from filter unit 4 is tapered. The positioning portion 42 of filter unit 4 in first housing 11 passes through guide cylinder 1 51, while the positioning portion 42 of filter unit 4 in second housing 12 passes through adjacent guide cylinder 2 62.

[0096] The bottom end of filter unit 4 contracts inwardly to form step 1 (43). Step 1 (43) of filter unit 4 in first housing 11 rests on baffle plate 1 (61), while step 1 (43) of filter unit 4 in second housing 12 rests on baffle plate 2 (71). The bottom end of step 1 (43) contracts inwardly to form step 2 (44). Step 2 (44) of filter unit 4 in first housing 11 passes into adjacent guide cylinder 2 (62), while step 2 (44) of filter unit 4 in second housing 12 passes into guide cylinder 3 (72).

[0097] The positioning portion 42 and the second step 44 cooperate to provide positioning for the installation of the filter unit 4, so that the filter unit 4 is stably located in the unit housing.

[0098] A compensating elastic pad 421 is sleeved on the end of the positioning portion 42 near the circular plate 41. The bottom surface of the compensating elastic pad 421 abuts the circular plate 41. The top surface of the compensating elastic pad 421 of the filter unit 4 in the first housing 11 abuts the bottom surface of the guide ring plate 1 52. The top surface of the compensating elastic pad 421 of the filter unit 4 in the second housing 12 abuts the bottom surface of the guide ring plate 2 63. When fluid impacts the filter unit 4, the elastic compensating pad maintains a seal between the filter unit 4 and the corresponding guide ring plates 1 52 and 2 63, ensuring effective filtration.

[0099] An annular sealing groove 441 is defined along the circumference of the outer wall of step 2 44. A sealing ring 442 is embedded within sealing groove 441. Seal ring 442 of filter unit 4 within first housing 11 forms an interference fit with the inner circumference of guide cylinder 2 62, while seal ring 442 of filter unit 4 within second housing 12 forms an interference fit with the inner circumference of guide cylinder 3 72. Seal ring 442 maintains a seal between filter unit 4 and corresponding guide cylinders 1 51 and 2 62, further ensuring filtration effectiveness.

[0100] The tubular housing 1 is provided with a drain valve 8, which is provided on the first housing 11 near the second housing 12. When the filter needs to be maintained, the drain valve 8 is opened to discharge the fluid, and the filter can be disassembled.

[0101] The first housing 11 is provided with a first pressure measuring port 111 in communication with the interior of the first housing 11, and the second housing 12 is provided with a second pressure measuring port 121 in communication with the interior of the second housing 12. The first and second pressure measuring ports 111, 121 are each connected to an external pressure gauge. By observing the pressure difference between the two pressure gauges at the first and second pressure measuring ports 111, 121, it is possible to detect whether the filter unit 4 is clogged, thereby allowing the filter unit 4 to be replaced or cleaned promptly to ensure the filter's filtration effect.

[0102] A relief valve 611 is provided on the shielding ring plate 1 61. When the relief valve 611 is opened, the first housing 11 and the second housing 12 are connected through the relief valve 611. If the filter unit 4 in the first housing 11 becomes clogged but the filter is still needed, the relief valve 611 is opened, allowing the fluid in the clogged filter unit 4 to flow through the relief valve 611 to the next filter unit 4, allowing the filter to continue operating, thereby avoiding affecting the operating efficiency of the filter system and the economic benefits.

[0103] The implementation principle of a multi-stage tubular filter in Example 1 of the present application is as follows:

[0104] When assembling the filter, place the filter unit 4 of the first housing 11 from top to bottom into the first housing 11, with the step 1 43 of the filter unit 4 placed on the shielding ring plate 1 61 and the step 2 44 inserted into the guide cylinder 2 62. Then, align the first reducer 2 with the first housing 11, with the positioning portion 42 of the filter unit 4 in the first housing 11 inserted into the guide cylinder 1 51, and then fix the two first sealing joints 221 with the first clamp 222.

[0105] Then, the filter unit 4 of the second shell 12 is placed into the second shell 12 from bottom to top and the positioning portion 42 of the filter unit 4 is inserted into the second guide cylinder 62. Then, the second reducer 3 is aligned with the second shell 12, so that the step 1 43 of the filter unit 4 in the second shell 12 is placed on the second shielding ring plate 71, and the step 2 44 is inserted into the third guide cylinder 72. Then, the two second sealing joints 321 are fixed by the second clamp 322.

[0106] When filtering the fluid, the fluid enters the guide cylinder 1 51 from the inlet joint 21, then flows from the flow hole 1 511 to the guide ring plate 1 52, and flows from the flow hole 2 521 to the filter unit 4 in the first shell 11 and flows from the outside of the filter unit 4 to the inside of the filter unit 4, so that the impurities in the fluid are filtered on the outer peripheral wall of the filter unit 4 of the first shell 11. Under the blocking action of the blocking ring plate 1 61, the fluid filtered by the filter unit 4 in the first shell 11 flows through the inside of the filter unit 4 to the guide cylinder 2 62, and the fluid then flows from the flow hole 3 621 to the guide ring plate 2 63 and from the flow hole 4 631 to the filter unit 4 in the second shell 12 and flows from the outside of the filter unit 4 to the inside of the filter unit 4 for further filtration. Under the blocking action of the blocking ring plate 2 71, the fluid finally flows from the guide cylinder 3 72 to the outlet joint 31 and flows out of the filter.

[0107] Example 2

[0108] Reference Figure 5-7 The difference between Example 2 of the present application and Example 1 is that, in order to further improve the filtering effect, the tubular shell 1 also includes a third shell 13, which is arranged between the first shell 11 and the first reducer 2, and a filter unit 4 is also arranged in the third shell 13. The filtering capacity of the filter unit 4 in the third shell 13 is less than the filtering capacity of the filter unit 4 in the first shell 11.

[0109] The third housing 13 is fixed to the first reducer 2 via a third connecting assembly 131 , and the third housing 13 is fixed to the first housing 11 via a fourth connecting assembly 132 .

[0110] The third connecting assembly 131 includes a third sealing joint 1311 and a third clamp 1312. Two third sealing joints 1311 are arranged along the axial direction of the third clamp 1312. The two third sealing joints 1311 are respectively welded to one end of the third shell 13 close to the first reducer 2 and one end of the first reducer 2 close to the third shell 13. An annular third groove for the third clamp 1312 to be clamped is provided on the outer peripheral wall of the two third sealing joints 1311. The two axial ends of the third clamp 1312 are respectively clamped in the third grooves of the two third sealing joints 1311.

[0111] A third sealing ring 1313 is embedded in the third clamp 1312 , and both axial ends of the third sealing ring 1313 respectively abut against the outer circumferential walls of the two third sealing joints 1311 to improve the sealing between the third housing 13 and the first reducer 2 .

[0112] The fourth connecting assembly 132 includes a fourth sealing joint 1321 and a fourth clamp 1322. Two fourth sealing joints 1321 are arranged along the axial direction of the fourth clamp 1322. The two fourth sealing joints 1321 are respectively welded to one end of the third shell 13 close to the first shell 11 and one end of the first shell 11 close to the third shell 13. An annular fourth groove for clamping the fourth clamp 1322 is provided on the outer peripheral wall of the two fourth sealing joints 1321. The two axial ends of the fourth clamp 1322 are respectively clamped in the fourth grooves of the two fourth sealing joints 1321.

[0113] A fourth sealing ring 1323 is embedded in the fourth clamp 1322 , and both axial ends of the fourth sealing ring 1323 respectively abut against the outer circumferential walls of the two fourth sealing joints 1321 to improve the sealing between the third housing 13 and the first housing 11 .

[0114] A guide assembly 299 is disposed between the third housing 13 and the first housing 11. The guide assembly 299 comprises a baffle plate 3 91, a guide cylinder 292, and a guide ring plate 4 93. The baffle plate 3 91 is disposed at the bottom end of the third housing 13, with the outer circumferential wall of the baffle plate 3 91 welded to the inner circumferential wall of the third housing 13. The top end of the guide cylinder 292 is welded to the inner circumferential wall of the baffle plate 3 91. The guide cylinder 292 communicates with the interiors of two adjacent filter units 4. Multiple flow holes 5 921 are formed on the sidewall of the guide cylinder 292 at equal intervals along its circumference. The flow holes 5 921 are arranged in two rows of four equal intervals along the axial direction of the guide cylinder 292. The guide ring plate four 93 is welded to the bottom surface of the guide cylinder four 92, the inner circumferential surface of the guide ring plate four 93 is flush with the inner circumferential surface of the guide cylinder four 92, the outer circumferential wall of the guide ring plate four 93 is welded to the inner circumferential wall of the fourth sealing joint 1321 close to the third shell 13, and four flow holes six 931 are equidistantly provided on the top surface of the guide ring plate four 93 along the circumference of the guide ring plate four 93, and the flow holes six 931 are located on the outside of the filter unit 4.

[0115] The fluid is guided between the third housing 13 and the inlet connector 21 via a guide assembly 5. The positioning portion 42 of the filter unit 4 in the third housing 13 penetrates into the guide cylinder 51, while the positioning portion 42 of the filter unit 4 in the first housing 11 penetrates into the guide cylinder 92. The top surface of the compensating elastic pad 421 of the filter unit 4 in the third housing 13 abuts the bottom surface of the guide ring plate 52, while the top surface of the compensating elastic pad 421 of the filter unit 4 in the first housing 11 abuts the bottom surface of the guide ring plate 93. Step 1 43 of the filter unit 4 in the third housing 13 rests on the shielding ring plate 91. Step 2 44 of the filter unit 4 in the third housing 13 penetrates into the guide cylinder 92. The sealing ring 442 of the filter unit 4 in the third housing 13 forms an interference fit with the inner circumferential wall of the guide cylinder 92.

[0116] The third shell 13 is provided with a third pressure measuring interface 133 which is connected to the interior of the third shell 13. The third pressure measuring interface 133 is externally connected to a pressure gauge. By observing the change in the pressure difference between the two pressure gauges at the third pressure measuring interface 133 and the second pressure measuring interface 121, it is detected whether the filter unit 4 is blocked, so that the filter unit 4 is replaced or cleaned in time to ensure the filtering effect of the filter.

[0117] The implementation principle of a multi-stage tubular filter in Example 2 of the present application is as follows:

[0118] When assembling the filter, place the filter unit 4 of the first housing 11 from top to bottom into the first housing 11, with the step 1 43 of the filter unit 4 resting on the shielding ring plate 1 61 and the step 2 44 inserted into the guide cylinder 2 62. Then, align the third housing 13 with the first housing 11, with the positioning portion 42 of the filter unit 4 in the first housing 11 inserted into the guide cylinder 92, and then secure the two fourth sealing joints 1321 with the fourth clamp 1322.

[0119] Next, place the filter unit 4 of the third housing 13 from top to bottom into the third housing 13, with the step 1 43 of the filter unit 4 resting on the shielding ring plate 3 91 and the step 2 44 inserted into the guide cylinder 4 92. Then, align the first reducer 2 with the third housing 13, with the positioning portion 42 of the filter unit 4 in the third housing 13 inserted into the guide cylinder 1 51, and then secure the two third sealing joints 1311 with the third clamp 1312.

[0120] Then, the filter unit 4 of the second shell 12 is placed into the second shell 12 from bottom to top and the positioning portion 42 of the filter unit 4 is inserted into the second guide cylinder 62. Then, the second reducer 3 is aligned with the second shell 12, so that the step 1 43 of the filter unit 4 in the second shell 12 is placed on the second shielding ring plate 71, and the step 2 44 is inserted into the third guide cylinder 72. Then, the two second sealing joints 321 are fixed by the second clamp 322.

[0121] When filtering the fluid, the fluid enters the guide cylinder 1 51 from the inlet joint 21, then flows from the flow hole 1 511 to the guide ring plate 1 52, and flows from the flow hole 2 521 to the filter unit 4 in the third housing 13 and flows from the outside of the filter unit 4 to the inside of the filter unit 4, so that the impurities in the fluid are filtered on the outer peripheral wall of the filter unit 4 of the third housing 13. Under the blocking effect of the shielding ring plate 3 91, the fluid passing through the filter unit 4 in the third housing 13 flows through the inside of the filter unit 4 to the guide cylinder 4 92, and then flows from the flow hole 5 921 to the guide ring plate 4 93 and flows from the flow hole 6 931 to the third housing 13. The filter unit 4 in the first shell 11 flows from the outside of the filter unit 4 to the inside of the filter unit 4 for further filtration. Impurities in the fluid are filtered on the outer peripheral wall of the filter unit 4 of the first shell 11. Under the blocking action of the blocking ring plate 1 61, the fluid flows from the flow hole 3 621 of the guide cylinder 2 62 to the guide ring plate 2 63 and from the flow hole 4 631 to the filter unit 4 in the second shell 12 and flows from the outside of the filter unit 4 to the inside of the filter unit 4 for further filtration. Under the blocking action of the blocking ring plate 2 71, the fluid finally flows from the guide cylinder 3 72 to the outlet joint 31 and flows out of the filter.

[0122] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A multi-stage tubular filter, characterized in that: include: A tubular housing (1), the tubular housing (1) comprising a first housing (11) and a second housing (12) arranged along its own axial direction and connected to each other, a tubular first reducer (2) being provided at the top end of the first reducer (2), an inlet connector (21) being provided at the top end of the first reducer (2), the inlet connector (21) being in communication with the first reducer (2) and the interior of the first housing (11), a tubular second reducer (3) being provided at the bottom end of the second housing (12), an outlet connector (31) being provided at the bottom end of the second reducer (3), the outlet connector (31) being in communication with the second reducer (3) and the interior of the second housing (12); A filter unit (4), wherein each of the first housing (11) and the second housing (12) corresponds to a filter unit (4), filter holes / filter gaps with different filtering capabilities are provided on the peripheral side walls of the filter unit (4), the size of the filter holes / filter gaps on the filter unit (4) located below is smaller than the size of the filter holes / filter gaps on the filter unit (4) located above, the top end of the filter unit (4) is closed, and the bottom end of the filter unit (4) is open; A guide assembly (5), wherein the guide assembly (5) is arranged at the first reducer (2); A second guide assembly (6), wherein the second guide assembly (6) is disposed between the first housing (11) and the second housing (12); A guide assembly three (7), wherein the guide assembly three (7) is arranged at the second reducer (3).

2. The multi-stage tubular filter according to claim 1, characterized in that: The first reducer (2) is fixed to the first housing (11) via a first connecting assembly (22), the second reducer (3) is fixed to the second housing (12) via a second connecting assembly (32), and the first housing (11) and the second housing (12) are welded; The first connection assembly (22) comprises a first sealing joint (221) and a first clamp (222), two first sealing joints (221) are provided along the axial direction of the first clamp (222), the two first sealing joints (221) are respectively fixedly connected to one end of the first housing (11) close to the first reducer (2) and one end of the first reducer (2) close to the first housing (11), and an annular first groove for the first clamp (222) to be clamped is provided on the outer peripheral walls of the two first sealing joints (221), and the axial ends of the first clamp (222) are respectively clamped in the first grooves of the two first sealing joints (221); A first sealing ring (223) is embedded in the first hoop (222), and two axial ends of the first sealing ring (223) respectively abut against the outer peripheral walls of the two first sealing joints (221); The second connection assembly (32) comprises a second sealing joint (321) and a second clamp (322), two second sealing joints (321) are provided along the axial direction of the second clamp (322), the two second sealing joints (321) are respectively fixedly connected to one end of the second housing (12) close to the second reducer (3) and one end of the second reducer (3) close to the second housing (12), and an annular second groove for the second clamp (322) to be clamped is provided on the outer peripheral wall of the two second sealing joints (321), and the axial ends of the second clamp (322) are respectively clamped in the second grooves of the two second sealing joints (321); A second sealing ring (323) is embedded in the second hoop (322), and the axial ends of the second sealing ring (323) are respectively in contact with the outer peripheral walls of the two second sealing joints (321).

3. The multi-stage tubular filter according to claim 1, characterized in that: The guide assembly (5) comprises a guide cylinder (51) and a guide ring plate (52). The top end of the guide cylinder (51) is fixedly connected to the inner top wall of the first reducer (2). The guide cylinder (51) is coaxial with and connected to the inlet joint (21). A plurality of flow holes (511) are equidistantly provided on the peripheral side wall of the guide cylinder (51) along its own circumferential direction. The flow holes (511) are arranged in multiple rows equidistantly along the axial direction of the guide cylinder (51). The guide ring plate 1 (52) is fixedly connected to the bottom surface of the guide cylinder 1 (51), the inner circumferential surface of the guide ring plate 1 (52) is flush with the inner circumferential surface of the guide cylinder 1 (51), the outer circumferential wall of the guide ring plate 1 (52) is fixedly connected to the inner circumferential wall of the first sealing joint (221) close to the first reducer (2), and a plurality of flow holes 2 (521) are equidistantly provided on the top surface of the guide ring plate 1 (52) along the circumference of the guide ring plate 1 (52), and the flow holes 2 (521) are located outside the filter unit (4); The second guide assembly (6) comprises a first shielding ring plate (61), a second guide cylinder (62), and a second guide ring plate (63); the first shielding ring plate (61) is arranged between the first shell (11) and the second shell (12); and the first shielding ring plate (61) is sealedly connected to the first shell (11) and the second shell (12); The top end of the second guide cylinder (62) is fixedly connected to the inner peripheral wall of the shielding ring plate (61), and the second guide cylinder (62) is communicated with the interiors of two adjacent filter units (4). A plurality of third flow holes (621) are equidistantly provided on the peripheral side wall of the second guide cylinder (62) along its own circumference, and the third flow holes (621) are arranged in multiple rows equidistantly along the axial direction of the second guide cylinder (62); The second guide ring plate (63) is fixedly connected to the bottom surface of the second guide cylinder (62), the inner peripheral surface of the second guide ring plate (63) is flush with the inner peripheral surface of the second guide cylinder (62), the outer peripheral wall of the second guide ring plate (63) is fixedly connected to the inner peripheral wall of the second shell (12), and a plurality of fourth flow holes (631) are equidistantly provided on the top surface of the second guide ring plate (63) along the circumference of the second guide ring plate (63), and the fourth flow holes (631) are located outside the filter unit (4); The guide assembly three (7) includes a shielding ring plate two (71) and a guide cylinder three (72). The outer peripheral wall of the shielding ring plate two (71) is fixedly connected to the inner peripheral wall of the second sealing joint (321) close to the second reducer (3); the top end of the guide cylinder three (72) is fixedly connected to the inner peripheral wall of the shielding ring plate two (71), and the bottom end of the guide cylinder three (72) is fixedly connected to the inner bottom wall of the second reducer (3). The guide cylinder three (72) is coaxial with and connected to the outlet joint (31).

4. The multi-stage tubular filter according to claim 3, characterized in that: A circular plate (41) is coaxially connected to the top surface of each filter unit (4), the outer diameter of the circular plate (41) is smaller than the outer diameter of the filter unit (4), a positioning portion (42) is coaxially connected to the top surface of the circular plate (41), the outer diameter of the positioning portion (42) is smaller than the outer diameter of the circular plate (41), and one end of the positioning portion (42) away from the filter unit (4) is tapered; The positioning portion (42) of the filter unit (4) in the first housing (11) penetrates into the first guide cylinder (51), and the positioning portion (42) of the filter unit (4) in the second housing (12) penetrates into the adjacent second guide cylinder (62); The bottom end of the filter unit (4) is contracted inwardly to form a step (43); the step (43) of the filter unit (4) in the first housing (11) is mounted on a first shielding ring plate (61); and the step (43) of the filter unit (4) in the second housing (12) is mounted on a second shielding ring plate (71); The bottom end of the step 1 (43) is contracted inward to form a step 2 (44); the step 2 (44) of the filter unit (4) in the first housing (11) is inserted into the adjacent guide cylinder 2 (62); and the step 2 (44) of the filter unit (4) in the second housing (12) is inserted into the guide cylinder 3 (72).

5. The multi-stage tubular filter according to claim 4, characterized in that: A compensating elastic pad (421) is sleeved on one end of the positioning portion (42) close to the circular plate (41), the bottom surface of the compensating elastic pad (421) abuts against the circular plate (41), the top surface of the compensating elastic pad (421) of the filter unit (4) in the first housing (11) abuts against the bottom surface of the guide ring plate 1 (52), and the top surface of the compensating elastic pad (421) of the filter unit (4) in the second housing (12) abuts against the bottom surface of the guide ring plate 2 (63); An annular sealing groove (441) is provided on the outer peripheral wall of the second step (44) along its own circumference, and a sealing ring (442) is embedded in the sealing groove (441). The sealing ring (442) of the filter unit (4) in the first shell (11) is interference-fitted with the inner peripheral wall of the second guide cylinder (62), and the sealing ring (442) of the filter unit (4) in the second shell (12) is interference-fitted with the inner peripheral wall of the third guide cylinder (72).

6. The multi-stage tubular filter according to claim 1, characterized in that: The tubular housing (1) is provided with a drain valve (8), and the drain valve (8) is arranged at a position on the first housing (11) close to the second housing (12).

7. The multi-stage tubular filter according to claim 1, characterized in that: The first housing (11) is provided with a first pressure measuring interface (111) communicating with the interior of the first housing (11), and the second housing (12) is provided with a second pressure measuring interface (121) communicating with the interior of the second housing (12). The first pressure measuring interface (111) and the second pressure measuring interface (121) are respectively connected to external pressure gauges.

8. The multi-stage tubular filter according to claim 3, characterized in that: The shielding ring plate (61) is provided with an overflow valve (611). When the overflow valve (611) is opened, the first shell (11) and the second shell (12) are connected through the overflow valve (611).

9. The multi-stage tubular filter according to claim 1, characterized in that: The tubular housing (1) further comprises a third housing (13), the third housing (13) being arranged between the first housing (11) and the first reducer (2), and a filter unit (4) being also arranged in the third housing (13); The third housing (13) and the first reducer (2) are fixed via a third connecting assembly (131), and the third housing (13) and the first housing (11) are fixed via a fourth connecting assembly (132); The third connection assembly (131) comprises a third sealing joint (1311) and a third clamp (1312), two third sealing joints (1311) are provided along the axial direction of the third clamp (1312), the two third sealing joints (1311) are respectively fixedly connected to one end of the third housing (13) close to the first reducer (2) and one end of the first reducer (2) close to the third housing (13), and an annular third groove for the third clamp (1312) to be clamped is provided on the outer peripheral wall of the two third sealing joints (1311), and the axial ends of the third clamp (1312) are respectively clamped in the third grooves of the two third sealing joints (1311); A third sealing ring (1313) is embedded in the third clamp (1312), and the two axial ends of the third sealing ring (1313) are respectively in contact with the outer peripheral walls of the two third sealing joints (1311); The fourth connection assembly (132) includes a fourth sealing joint (1321) and a fourth clamp (1322), two fourth sealing joints (1321) are provided along the axial direction of the fourth clamp (1322), and the two fourth sealing joints (1321) are respectively fixedly connected to one end of the third shell (13) close to the first shell (11) and one end of the first shell (11) close to the third shell (13), and an annular fourth groove for the fourth clamp (1322) to be clamped is provided on the outer peripheral wall of the two fourth sealing joints (1321), and the two axial ends of the fourth clamp (1322) are respectively clamped in the fourth grooves of the two fourth sealing joints (1321); A fourth sealing ring (1323) is embedded in the fourth clamp (1322), and the axial ends of the fourth sealing ring (1323) are respectively in contact with the outer peripheral walls of the two fourth sealing joints (1321); A guide assembly four (9) is provided between the third housing (13) and the first housing (11), and the guide assembly four (9) includes a shielding ring plate three (91), a guide cylinder four (92), and a guide ring plate four (93). The shielding ring plate three (91) is provided at the bottom end of the third housing (13), and the outer peripheral wall of the shielding ring plate three (91) is fixedly connected to the inner peripheral wall of the third housing (13); The top end of the guide cylinder (4) (92) is fixedly connected to the inner peripheral wall of the shielding ring plate (3) (91), and the guide cylinder (4) (92) is connected to the interior of two adjacent filter units (4). A plurality of flow holes (5) (921) are equidistantly provided on the peripheral side wall of the guide cylinder (4) (92) along its own circumference, and the flow holes (5) (921) are arranged in multiple rows equidistantly along the axial direction of the guide cylinder (4) (92); The guide ring plate four (93) is fixedly connected to the bottom surface of the guide cylinder four (92), the inner circumferential surface of the guide ring plate four (93) is flush with the inner circumferential surface of the guide cylinder four (92), the outer circumferential wall of the guide ring plate four (93) is fixedly connected to the inner circumferential wall of the fourth sealing joint (1321) close to the third shell (13), and a plurality of flow holes six (931) are equidistantly provided on the top surface of the guide ring plate four (93) along the circumference of the guide ring plate four (93), and the flow holes six (931) are located outside the filter unit (4); The fluid is guided between the third housing (13) and the inlet joint (21) by a guide assembly (5). The positioning portion (42) of the filter unit (4) in the third housing (13) penetrates into the guide cylinder (51), and the positioning portion (42) of the filter unit (4) in the first housing (11) penetrates into the guide cylinder (92). The top surface of the compensation elastic pad (421) of the filter unit (4) in the third housing (13) abuts against the bottom surface of the guide ring plate (52). The top surface of the compensating elastic pad (421) of the filter unit (4) in the housing (11) abuts against the bottom surface of the guide ring plate four (93); the step one (43) of the filter unit (4) in the third housing (13) is placed on the shielding ring plate three (91), and the step two (44) of the filter unit (4) in the third housing (13) penetrates into the guide cylinder four (92), and the sealing ring (442) of the filter unit (4) in the third housing (13) is interference-fitted with the inner peripheral wall of the guide cylinder four (92).

10. The multi-stage tubular filter according to claim 9, characterized in that: The third housing (13) is provided with a third pressure measuring interface (133) communicating with the interior of the third housing (13), and the third pressure measuring interface (133) is externally connected to a pressure gauge.

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