A detachable outlet collector

Abstract

The application provides a detachable outlet collector, and belongs to the technical field of filtering and collecting devices.The outlet collector comprises a special-shaped flange including a cylindrical body, one end of the body is provided with a flange plate, and a positioning ring is arranged in the middle part; the collecting element comprises a top layer collecting element, at least one middle layer collecting element and a bottom layer collecting element arranged in sequence from top to bottom, and the bottom layer collecting element is connected with the flange plate; an end cover is connected with the top layer collecting element; a positioning structure is arranged on the outer side of the end cover to clamp and fix the outlet collector and is detachably connected with the end cover.The beneficial effects of the technical scheme of the application are that the detachable positioning structure is arranged on the outer side of the end cover of the outlet collector to clamp and fix the outlet collector, the stress is dispersed to the equipment body connected with the outlet collector through the positioning structure, and the multilayer collecting element is used as the filtering and collecting structure to replace the existing ring plate structure which is insufficient in rigidity, thereby improving the rigidity of the outlet collector.

Description

Technical Field

[0001] This invention belongs to the technical field of filtration and collection devices, and more specifically, relates to a detachable outlet collector. Background Technology

[0002] An outlet collector is a filtration and collection device for the outlet of a container, and its applications include, but are not limited to, the oil refining and chemical industries. The design of an outlet collector must not only consider the ease of inspection, maintenance, disassembly, and replacement, but also ensure that the outlet collector has sufficient rigidity and load-bearing capacity.

[0003] Outlet collectors are commonly used in environments handling corrosive materials or containing catalyst particles or ceramic balls. Traditional outlet collectors employ a design of alternating gaskets and ring plates, with the ring plates typically 2mm thick. This design suffers from poor rigidity and is prone to deformation, leading to widening of localized filter gaps and filtration failure. For a total flow area of ​​1 square meter, a traditional outlet collector requires over 800 layers of alternating gaskets and ring plates. The sheer number of gaskets and ring plates necessitates stringent tooling protection measures during installation, use, and maintenance. The assembly process is extensive, demanding significant operational skills, and presents similar challenges during disassembly and reassembly for maintenance. Furthermore, traditional outlet collectors are bolted to the equipment using positioning and fixing rings, secured by a fillet weld between the fixing ring and the bottom surface of the equipment's connecting pipe. Both axial and lateral shear loads acting on the outlet collector are ultimately borne by this fillet weld. For composite plate equipment, the coating thickness of the bottom surface of the equipment body pipe is generally 3 to 6 mm. The design standard requires that the height of this fillet weld should not exceed the coating thickness, which results in the extremely limited load-bearing capacity of this fillet weld. For situations with large loads, this outlet collector fixing structure cannot guarantee strength. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and provide a detachable outlet collector. A detachable positioning structure is provided on the outside of the end cover of the outlet collector to clamp and fix the outlet collector. The positioning structure distributes the force to the device body connected to the outlet collector. Multi-layer collection elements are used as the filter collection structure to replace the existing ring plate structure with insufficient rigidity, thereby improving the rigidity of the outlet collector.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A detachable outlet collector, the outlet collector comprising:

[0007] An irregular flange, the irregular flange comprising a cylindrical body, one end of the body having a flange and a positioning ring in the middle;

[0008] The collection element includes a top collection element and a bottom collection element arranged sequentially from top to bottom, and the bottom collection element is connected to the flange.

[0009] End cap, the end cap being connected to the top-layer collecting element;

[0010] A positioning structure is provided on the outside of the end cap to clamp and fix the outlet collector and is detachably connected to the end cap.

[0011] Preferably, it also includes a plurality of first fasteners, each of which includes a stud and a nut;

[0012] Multiple first bolt holes are provided circumferentially on the contact surfaces between the irregular flange, the collecting element, and the end cap. The stud passes through the first bolt holes of the irregular flange, the collecting element, and the end cap in sequence and is screwed to fix the irregular flange, the collecting element, and the end cap.

[0013] A tapered neck is provided between the outer periphery of the body and the bottom surface of the flange.

[0014] Preferably, the positioning structure includes a pair of top plates, two pairs of upright plates, clamping bolts, and a second fastener, wherein the second fastener includes an inner bolt and an inner nut;

[0015] The top plate has a bolt hole in the center and bent edges at both ends, with bolt holes in the bent edges.

[0016] A bolt hole is provided at the center of the top surface of the end cap, and the clamping bolt is inserted into the bolt hole at the center of the top plate and the bolt hole at the center of the top surface of the end cap and screwed in for fixation;

[0017] The bottom of the upright plate is connected to the equipment body, and the top of the upright plate has bolt holes and is screwed to the bent edge of the top plate by the second fastener.

[0018] Preferably, at least one intermediate collection element is provided between the top collection element and the bottom collection element;

[0019] The top-level collecting element, the intermediate-level collecting element, and the bottom-level collecting element all include a Johnson net, which is a cylindrical structure. The bottom-level collecting element and the top-level collecting element all include external connectors, which are cylindrical structures.

[0020] One end of the external connector extends horizontally outward along the edge of the cylinder opening and is provided with an outer ring. Multiple first bolt holes are provided on the circumferential surface of the outer ring. Multiple first flow holes with equal area are provided on the outer circumferential surface of the external connector.

[0021] The outer edge of the bottom collecting element, away from the outer ring, extends along the inner sidewall of the bottom of the bottom collecting element and is welded and fixed to the vertical support rod of the Johnson mesh of the bottom collecting element. The other end of the bottom collecting element can be fixed to the flange by passing the stud through the first bolt hole of the outer ring.

[0022] The outer edge of the top-level collecting element, away from the outer ring, extends along the inner sidewall of the top of the top-level collecting element and is welded and fixed to the vertical support rod of the Johnson net of the top-level collecting element. The other end of the top-level collecting element can be fixed to the end cap by passing the stud through the first bolt hole of the outer ring.

[0023] The bottom collecting element and each of the intermediate collecting elements are also provided with a transition connector. The transition connector is a cylindrical structure, and a plurality of second flow holes with equal area are provided on the outer circumferential surface of the transition connector.

[0024] The two ends of the transition connector are welded and fixed to the vertical support rods of the Johnson net of the two adjacent layers of the collection element, respectively.

[0025] The first flow hole and the second flow hole are respectively offset from the vertical support rods on the Johnson net, and the first flow hole and the second flow hole are in the same vertical position.

[0026] Preferably, the design thickness δpn of the end cap is calculated using the following formula:

[0027] δpn=δp+C1+2×C2;

[0028] Where δp is the calculated thickness of the end cap, C1 is the negative thickness deviation of the material used for the end cap, and C2 is the one-sided corrosion allowance of the end cap.

[0029] The calculated thickness δp of the end cap is obtained by the following formula:

[0030]

[0031] Where Db is the diameter of the bolt circle formed by the multiple studs, ΔP is the equivalent circular plate with the bolt circle as the simply supported circle of the end cover, the pressure difference generated by the inlet and outlet of the equipment body is used as the uniform pressure on the equivalent circular plate, and [σ]t is the allowable stress of the material used for the end cover at the design temperature.

[0032] The diameter Db of the bolt circle is calculated using the following formula:

[0033]

[0034] Wherein, Nb is the number of studs, L1 is the minimum circumferential arc distance required for the studs to meet the loading and unloading operation, Dm is the large end diameter of the conical neck, and LA is the minimum radial distance required for the studs to meet the loading and unloading operation.

[0035] Preferably, the irregular flange further includes multiple stiffening plates, which are evenly distributed along the outer periphery of the body. The cross-section of the stiffening plate is trapezoidal, the top edge of the stiffening plate is connected to the bottom surface of the flange, the bottom edge of the stiffening plate is connected to the top surface of the positioning ring, and the inner side of the stiffening plate is connected to the outer periphery of the body.

[0036] Preferably, the number of stiffeners is less than or equal to the number of studs;

[0037] The thickness of the stiffener is greater than or equal to the thickness of the body.

[0038] Preferably, the flange outer diameter Do of the irregular flange is calculated using the following formula:

[0039] Do≥Db+2×Le;

[0040] Where Le is the maximum outer radius of the nut;

[0041] The thickness of the flange is initially calculated based on the design thickness of the end cap. The flange and stiffener are modeled as a whole using finite element analysis, and the stress distribution is calculated using elastic stress analysis. The overall membrane stress intensity and the combined membrane and bending stress intensity of the flange are calculated. If the stress intensity exceeds the stress intensity limit, the calculation is repeated by increasing the flange thickness and / or increasing the stiffener thickness and / or increasing the number of stiffeners up to the maximum number of studs, until the overall membrane stress intensity is less than the stress intensity limit and the combined membrane and bending stress intensity is less than the stress intensity limit. The final thickness of the flange is then determined based on these conditions.

[0042] Preferably, the slit width ΔW of the horizontal sieve bars of the Johnson mesh is calculated using the following formula:

[0043] ΔW = W2 - W1 < dpmin;

[0044] Wherein, dpmin is the minimum particle size of the non-passing particles in the Johnson mesh during the process operation, W1 is the width of the horizontal sieve bar of the Johnson mesh, W2 is the arrangement spacing of the horizontal sieve bar of the Johnson mesh, and the slot width ΔW is less than the minimum particle size of the non-passing particles in the process operation, dpmin.

[0045] The porosity η of the Johnson mesh is calculated using the following formula:

[0046]

[0047] The cylindrical diameter Dy of the Johnson net is calculated using the following formula:

[0048] Dy≤Db-dbmax-2×hz-2×hs;

[0049] Wherein, dbmax is the maximum outer diameter of the thread of the stud, hz is the height of the horizontal screen bar of the Johnson mesh, and hs is the height of the vertical support rod of the Johnson mesh.

[0050] Preferably, the total flow area of ​​the collecting element is S:

[0051] S=(Sdn-ΔSdn1+ΔSdn2)+M×(Sdm-ΔSdm1+ΔSdm2)+(Sdt-ΔSdt1+ΔSdt2)≥So:

[0052] Where M is the number of the intermediate layer collection elements, M≥0;

[0053] Sdn is the nominal flow area of ​​the Johnson net of the underlying collection element:

[0054] Sdn = π × Dy × Hd × η, where Hd is the cylindrical height of the Johnson net of the bottom collection element;

[0055] ΔSdn1 is the nominal flow area of ​​the Johnson net in the underlying collection element that is obscured by the external connector:

[0056] ΔSdn1=π×Dy×ΔHd×η, where ΔHd is the height of the Johnson net of the bottom collection element that is blocked by the external connector;

[0057] ΔSdn2 is the increased flow area of ​​the external connector in the bottom collection element due to the opening of multiple first flow holes;

[0058] Sdm collects the Johnson net nominal flow area of ​​each of the intermediate layer elements:

[0059] Sdm = π × Dy × Hm × η, where Hm is the cylinder height of the Johnson net for each of the intermediate layer collecting elements;

[0060] ΔSdm1 is the nominal flow area of ​​the Johnson net obscured by the transition connector in each of the intermediate layer collecting elements:

[0061] ΔSdm1=π×Dy×ΔHm×η, where ΔHm is the height of the cylinder of each of the intermediate layer collecting elements whose Johnson net is obscured by the transition connector;

[0062] ΔSdm2 is the increased flow area of ​​the transition connector in each of the intermediate layer collection elements due to the opening of multiple second flow holes;

[0063] Sdt is the nominal flow area of ​​the Johnson net for the top-level collection element:

[0064] Sdt = π × Dy × Ht × η, where Ht is the cylindrical height of the Johnson net of the top-level collecting element;

[0065] ΔSdt1 is the nominal flow area of ​​the Johnson net in the top-level collecting element that is obscured by the external connectors and transition connectors:

[0066] ΔSdt1=π×Dy×ΔHt×η, where ΔHt is the height of the Johnson net of the top-level collecting element that is obscured by the external connectors and transition connectors;

[0067] △Sdt2 is the increased flow area in the top-level collecting element due to the multiple first flow holes opened in the external connector and the multiple second flow holes opened in the transition connector;

[0068] So, design the required flow area for the outlet collector: di is the inner diameter of the connecting pipe of the device connected to the outlet collector.

[0069] The beneficial effects of the technical solution of the present invention are as follows:

[0070] 1. The outlet collector of the present invention has a detachable positioning structure on the outside of the end cap to clamp and fix the outlet collector. The positioning structure distributes the force to the device body connected to the outlet collector. The multi-layer collection element is used as the filter collection structure to replace the existing ring plate structure with insufficient rigidity, thereby improving the rigidity of the outlet collector.

[0071] 2. The positioning structure of the present invention transfers the force to the welded joint connecting the upright plate and the equipment body. By increasing the number, thickness and width of the upright plates, the load-bearing capacity of the welded joint is improved, thereby adapting to different load-bearing requirements. It overcomes the shortcomings of insufficient strength of traditional fixed structures and the structure is safe and reliable.

[0072] 3. The outlet collector of the present invention uses Johnson mesh instead of the traditional gasket + ring plate arrangement, which reduces the number of parts, simplifies the structure, and reduces the amount of manufacturing, installation and maintenance work; Johnson mesh adopts mechanical automated mesh production process, which has high rigidity, manufacturing precision and production efficiency; the opening ratio and total flow area of ​​Johnson mesh in the collection element are calculated by relevant formulas to ensure filtration efficiency and collection efficiency, and reliable process performance.

[0073] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0074] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0075] Figure 1 A schematic diagram of the detachable outlet collector according to an embodiment of the present invention is shown;

[0076] Figure 2 A cross-sectional schematic diagram of a detachable outlet collector according to an embodiment of the present invention is shown;

[0077] Figure 3 A schematic diagram of the structure of the first fastener of the detachable outlet collector according to an embodiment of the present invention is shown;

[0078] Figure 4 A cross-sectional schematic diagram of the irregular flange of the detachable outlet collector according to an embodiment of the present invention is shown;

[0079] Figure 5 A schematic diagram of the underlying collection element of the detachable outlet collector according to an embodiment of the present invention is shown;

[0080] Figure 6 A schematic diagram of the structure of the intermediate layer collection element of the detachable outlet collector according to an embodiment of the present invention is shown;

[0081] Figure 7 A schematic diagram of the top collection element of the detachable outlet collector according to an embodiment of the present invention is shown;

[0082] Figure 8 A schematic diagram of the Johnson net layout structure of a detachable outlet collector according to an embodiment of the present invention is shown;

[0083] Figure 9 A front view of the positioning structure of the detachable outlet collector according to an embodiment of the present invention is shown;

[0084] Figure 10 A top view of the positioning structure of the detachable outlet collector according to an embodiment of the present invention is shown;

[0085] Figure 11 A schematic diagram showing the connection between the middle end cover and the top plate of the detachable outlet collector according to an embodiment of the present invention is shown.

[0086] Figure 12 A schematic diagram showing the connection between the central plate and the top plate of the detachable outlet collector according to an embodiment of the present invention is shown.

[0087] Explanation of reference numerals in the attached figures:

[0088] 1. Equipment connecting pipe; 2. Outlet collector; 3. Positioning structure; 4. Pad; 5. Equipment body; 201. Irregular flange; 2011. Body; 2012. Positioning ring; 2013. Flange; 2014. Conical neck; 202. Rib plate; 203. Bottom collecting element; 2030. First bolt hole; 2031. Transition connector; 2032. Johnson mesh of bottom collecting element; 2033. External connector; 2034. First flow hole; 2035. Second flow hole; 204 2042. Intermediate layer collecting element; 205. Johnson mesh of intermediate layer collecting element; 206. Top layer collecting element; 207. Johnson mesh of top layer collecting element; 208. First fastener; 209. Stud; 2000. Nut; 201. End cap; 202. Lifting lug; 203. Collecting element; 204. Horizontal screen bar; 205. Vertical support rod; 206. Vertical plate; 207. Top plate; 308. Clamping bolt; 209. Second fastener; 3000. Inner nut; 3000. Inner bolt. Detailed Implementation

[0089] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0090] Example 1

[0091] Reference Figure 1 , Figure 2 As shown, the present invention provides a detachable outlet collector, the outlet collector 2 comprising:

[0092] The irregular flange 201 includes a cylindrical body 2011, a flange 2013 at one end of the body 2011, and a positioning ring 2012 in the middle.

[0093] The collecting element 209 includes a top collecting element 205 and a bottom collecting element 203 arranged sequentially from top to bottom. The bottom collecting element 203 is connected to the flange 2013.

[0094] End cap 207, end cap 207 is connected to top layer collecting element 205;

[0095] Positioning structure 3 is provided on the outside of end cap 207 to clamp and fix outlet collector 2 and is detachably connected to end cap 207.

[0096] Specifically, the irregular flange 201 includes a cylindrical body 2011, with a flange 2013 welded to one end of the body 2011. The flange 2013 is used to connect the cylindrical collecting element 209. A positioning ring 2012 is welded to the middle of the body 2011. The outer diameter of the body 2011 of the irregular flange 201 is do, and the inner diameter of the equipment mating pipe 1 is di. do is smaller than the inner diameter di of the equipment mating pipe 1. In this embodiment, the inner diameter di of the equipment mating pipe 1 is 248 mm, and the outer diameter do of the body 2011 of the irregular flange is 246 mm. The positioning ring 2012 controls the depth to which the irregular flange 201 is inserted into the equipment mating pipe 1 to be 82 mm. A detachable positioning structure 3 is provided on the outside of the end cap 207 of the outlet collector 2 to clamp and fix the outlet collector 2, forming a detachable outlet collector 2. The outlet collector 2 distributes the force to the equipment body 5 connected to it through the positioning structure 3, reducing the force on the outlet collector 2 itself. For situations with large loads, this makes the structure safe and reliable. The collection element 209 of the outlet collector 2 incorporates a Johnson mesh as a filtration and collection structure. The top collection element 205 and the bottom collection element 203 arranged sequentially from top to bottom form a multi-layer collection element as a filtration and collection structure, providing solid filtration and fluid flow channels for the outlet collector 2. This structure of the outlet collector 2 replaces the existing ring plate structure with insufficient rigidity, overcomes the shortcomings of insufficient strength of traditional fixed structures, improves the rigidity and load-bearing capacity of the outlet collector, and makes the structure safe and reliable.

[0097] Furthermore, the end cap 207 is circular, and a pair of lifting lugs 208 are symmetrically welded on both sides of the end cap 207 for lifting the outlet collector 2.

[0098] Optional, refer to Figure 2-4 As shown, the outlet collector 2 also includes a plurality of first fasteners 206, each of which includes a stud 2061 and a nut 2062;

[0099] Multiple first bolt holes 2030 are provided circumferentially on the contact surface between the irregular flange 201, the collecting element 209 and the end cover 207. The stud 2061 passes through the first bolt holes 2030 of the irregular flange 201, the collecting element 209 and the end cover 207 in sequence and is screwed to fix the irregular flange 201, the collecting element 209 and the end cover 207.

[0100] A tapered neck 2014 is provided between the outer periphery of the body 2011 and the bottom surface of the flange 2013.

[0101] Specifically, in this embodiment, the studs 2061 are 8-M20 in size, and there are 8 of them. The contact surface between the irregular flange 201, the collecting element 209, and the end cap 207 is a circular surface, and 8 first bolt holes 2030 are evenly provided on the circular surface along the circumference. The included angle between adjacent studs 2061 is 45°. Figure 10 As shown, the stud 2061 passes through the first bolt hole 2030 of the irregular flange 201, the collecting element 209 and the end cover 207 in sequence. The two ends of the stud 2061 are fixed by nuts 2062. The structure is simple and easy to install.

[0102] Optional, refer to Figure 9-12 As shown, the positioning structure 3 includes a pair of top plates 302, two pairs of upright plates 301, clamping bolts 303 and a second fastener 304. The second fastener 304 includes an inner bolt 3042 and an inner nut 3041.

[0103] The top plate 302 has a bolt hole in the center and bent edges at both ends, with bolt holes in the bent edges.

[0104] A bolt hole is provided at the center of the top surface of the end cap 207. The clamping bolt 303 is inserted into the bolt hole at the center of the top plate 302 and the bolt hole at the center of the top surface of the end cap 207 and is screwed in for fixation.

[0105] The bottom of the upright plate 301 is connected to the equipment body 5, and the top of the upright plate 301 has bolt holes and is screwed to the bent edge of the top plate 302 by the second fastener 304.

[0106] Specifically, each top plate 302 has its two ends bent to form folded edges, with bolt holes of φ14 diameter opened on the bent edges. The bottom of the vertical plate 301 is welded to the pad 4 on the equipment body 5, and a bolt hole of φ14 diameter is opened at the center of the top of the vertical plate 301. The second fastener 304 adopts the M12 specification, and the inner bolt 3042 is inserted into the above-mentioned bolt hole. The inner nut 3041 fixes the inner bolt 3042, realizing the mating installation of one top plate 302 and a pair of vertical plates 301, such as... Figure 12 As shown.

[0107] A threaded hole for connection with the positioning structure 3 is opened at the center of the top surface of the end cover 207. The clamping bolt 303 is of M14 specification, inserted into the bolt hole at the center of the top plate 302 and the threaded hole at the center of the top surface of the end cover 207, and screwed together for fixation, so as to realize the mating installation of the top plate 302 and the end cover 207. Figure 11 As shown.

[0108] The positioning structure 3 distributes the force to the equipment body 5 connected to the outlet collector, which is ultimately borne by the welded joint connecting the vertical plate 301 and the pad plate 4. For heavy loads, the load-bearing capacity of the welded joint is increased by increasing the number, thickness, and width of the vertical plates, thereby adapting to different load requirements and overcoming the shortcomings of insufficient strength in traditional fixed structures, making the structure safe and reliable.

[0109] Optional, refer to Figure 5-7 As shown, at least one intermediate layer collection element 204 is provided between the top layer collection element 205 and the bottom layer collection element 203;

[0110] The top-level collecting element 205, the middle-level collecting element 204, and the bottom-level collecting element 203 all include a Johnson net, which is a cylindrical structure. The bottom-level collecting element 203 and the top-level collecting element 205 both include an external connector 2033, which is a cylindrical structure.

[0111] One end of the external connector 2033 extends horizontally outward along the edge of the cylinder opening and has an outer ring. Multiple first bolt holes 2030 are opened on the circumferential surface of the outer ring. Multiple first flow holes 2034 with equal area are arranged at intervals on the outer circumferential surface of the external connector 2033.

[0112] The outer edge of the outer connector 2033 of the bottom collecting element 203, away from the outer ring, extends along the inner side wall of the bottom of the bottom collecting element 203 and is welded and fixed to the vertical support rod 211 of the Johnson mesh of the bottom collecting element 203. The other end is fixed to the flange 2013 by the first bolt hole 2030 of the outer ring through the stud 2061.

[0113] The outer edge of the external connector 2033 of the top collecting element 205 away from the outer ring extends along the inner side wall of the top of the top collecting element 205 and is welded and fixed to the vertical support rod 211 of the Johnson net of the top collecting element 205. The other end is fixed to the end cap 207 by the first bolt hole 2030 of the outer ring through the stud 2061.

[0114] The bottom collecting element 203 and each intermediate collecting element 204 are also provided with a transition connector 2031. The transition connector 2031 is a cylindrical structure, and a plurality of spaced and equal-area second flow holes 2035 are provided on the outer circumferential surface of the transition connector 2031.

[0115] The two ends of the transition connector 2031 are welded and fixed to the vertical support rods 211 of the Johnson net of the two adjacent collection elements, respectively;

[0116] The first flow hole 2034 and the second flow hole 2035 are respectively staggered from the vertical support rod 211 on the Johnson net, and the first flow hole 2034 and the second flow hole 2035 are in the same vertical position.

[0117] Specifically, the bottom collection element 203 is installed on the flange 2013 of the irregular flange 201. The bottom collection element 203 includes an external connector 2033, a Johnson mesh 2032, and a transition connector 2031. The external connector 2033 is inserted into and welded to the bottom of the Johnson mesh 2032, and the transition connector 2031 is welded to the top of the Johnson mesh 2032. At least one intermediate layer collection element 204 is provided between the top collection element 205 and the bottom collection element 203. Each intermediate layer collection element 204 is composed of a Johnson mesh and a transition connector 2031. The transition connector 2031 is welded to the top of the Johnson mesh 2042. The top collection element 205 includes a Johnson mesh 2052 and an external connector 2033. The external connector 2033 is inserted into and welded to the top of the Johnson mesh 2052. The external connector 2033 has a first bolt hole 2030. The stud 2061 passes through the first bolt hole 2030 to fix the collecting element 209 between the end cover 207 and the special flange 201. The Johnson mesh replaces the traditional gasket + ring plate arrangement, which reduces the number of parts, simplifies the structure, and reduces the amount of manufacturing, installation and maintenance work. The Johnson mesh adopts a mechanical automated mesh production process, which has high manufacturing precision and production efficiency, and strong rigidity, thus improving the rigidity of the collecting element.

[0118] Furthermore, in this embodiment, three intermediate layer collection elements 204 are provided between the top layer collection element 205 and the bottom layer collection element 203, which can further filter out impurities such as tiny particles in the material and improve the collection quality of the filtered material.

[0119] Furthermore, multiple first flow holes 2034 and multiple second flow holes 2035 are respectively formed on the external connector 2033 and the transition connector 2031. The first flow holes 2034 and the second flow holes 2035 are staggered from each other with respect to the vertical support rods 211 on the Johnson mesh. That is, each flow hole is set with the vertical extension line of two adjacent vertical support rods 211 as the boundary line, preferably with the center set. Moreover, the first flow holes 2034 and the second flow holes 2035 are aligned vertically, and the first flow holes 2034 and the second flow holes 2035 in the same vertical column are located on the same straight line. The multiple first flow holes 2034 and the multiple second flow holes 2035 are formed to compensate for the loss of flow area caused by the insertion of the Johnson mesh into the external connector 2033 and the transition connector 2031. The staggered arrangement of the flow holes with respect to the vertical support rods 211 on the Johnson mesh avoids flow loss caused by the vertical support rods 211, thereby increasing the total flow area of ​​the collecting element 209.

[0120] Optionally, the design thickness δpn of the end cap 207 is calculated using the following formula:

[0121] δpn=δp+C1+2×C2;

[0122] Where δp is the calculated thickness of the end cap, C1 is the negative thickness deviation of the material used for the end cap, and C2 is the one-sided corrosion allowance of the end cap.

[0123] The calculated thickness δp of end cap 207 is obtained by the following formula:

[0124]

[0125] Where Db is the diameter of the bolt circle formed by multiple studs 2061, ΔP is the equivalent circular plate with the bolt circle as the simply supported circle of the end cover 207, the pressure difference generated by the feed inlet and discharge outlet of the equipment body is used as the uniform pressure on the equivalent circular plate, and [σ]t is the allowable stress of the material used for the end cover 207 at the design temperature.

[0126] The diameter Db of the bolt circle is calculated using the following formula:

[0127]

[0128] Where Nb is the number of studs, L1 is the minimum circumferential arc distance required for the studs to meet the loading and unloading operations, Dm is the large end diameter of the conical neck, and LA is the minimum radial spacing required for the studs to meet the loading and unloading operations.

[0129] Specifically, in this embodiment, the number of M20 type studs 2061 is Nb = 8. The studs 2061 are designed to meet the minimum circumferential arc distance L1 = 46mm required for loading and unloading operations. The diameter Dm of the tapered neck 2014 of the irregular flange 201 is equal to the outer diameter do of the body 2011 of the irregular flange 201 = 246mm. The studs 2061 are designed to meet the minimum radial spacing LA = 30mm required for loading and unloading operations. The following calculations are performed:

[0130]

[0131] The actual value is Db = 372 mm.

[0132] The end cap 207 is made of S31603 forging. The force on the end cap 207 falls on the stud 2061 of the first fastener 206 installed on the end cap 207. The bolt circle formed by the stud 2061 is the simply supported circle of the outlet collector. The end cap 207 is equivalent to a uniformly compressed circular plate with simply supported edges. The uniform pressure on the equivalent circular plate is the pressure difference generated by the inlet and outlet of the equipment body 5. In this embodiment, ΔP = 1MPa is taken, the design temperature is 300℃, and the maximum stress of the equivalent circular plate is less than twice the allowable stress of the material at the design temperature [σ]t = 70MPa. The calculated thickness δp of the end cap 207 is:

[0133]

[0134] The thickness negative deviation C1 of the S31603 forging for end cap 207 is 0.3 mm, the corrosion allowance C2 of end cap 207 is 6 mm, and the minimum design thickness δpn of end cap 207 is:

[0135] δpn=δp+C1+2×C2=17.5+0.3+6×2=29.8, and the final design thickness of end cap 207 is δpn=34mm.

[0136] Optionally, the irregular flange 201 also includes multiple stiffening plates 202. The multiple stiffening plates 202 are evenly distributed along the outer periphery of the body 2011. The cross-section of the stiffening plate 202 is trapezoidal. The top edge of the stiffening plate 202 is connected to the bottom surface of the flange, the bottom edge of the stiffening plate 202 is connected to the top surface of the positioning ring, and the inner side of the stiffening plate 202 is connected to the outer periphery of the body 2011.

[0137] Preferably, the number of stiffeners 202 is less than or equal to the number of studs 2061;

[0138] The thickness of the stiffening plate 202 is greater than or equal to the thickness of the body 2011.

[0139] Specifically, the cylindrical body 2011 of the irregular flange 201 bears an external pressure of -ΔP. According to the stability check of the external pressure cylinder in section 4.3 of GB / T 150.3-2011, the thickness of the body 2011 is calculated to be δz = 7mm. The outer diameter of the bottom plane of the equipment mating pipe is Dno = 320mm, the outer diameter of the positioning ring 2012 of the irregular flange 201 is Ddo = 310mm, and the thickness δd of the positioning ring 2012 is greater than or equal to the thickness δz of the body 2011 of the irregular flange 201. Therefore, the actual thickness of the positioning ring 2012 is taken as δd = 15mm.

[0140] The stiffening ribs 202 are evenly arranged around the circumference of the body 2011 of the irregular flange 201. The number of stiffening ribs 202 is less than or equal to the number of studs 2061, and in actual design, it depends on whether the number of studs 2061 is odd or even. For example, when the number of studs 2061 is set to 8, the stiffening ribs 202 can be 8, 4, or even 2 and arranged symmetrically. When the number of studs 2061 is set to 5, the number of stiffening ribs 202 is the same as the number of studs 2061, and they are arranged at equal intervals and staggered with the studs 2061. The thickness of the stiffening ribs 202 is greater than or equal to the thickness of the body 2011. In this embodiment, the thickness of the stiffening ribs 202 is δj = 10mm. The stiffening ribs 202 effectively enhance the structural strength of the irregular flange 201 and further improve the rigidity of the outlet collector 2.

[0141] Optional, refer to Figure 4 As shown, the outer diameter Do of the flange 2013 of the irregular flange 201 is calculated using the following formula:

[0142] Do≥Db+2×Le;

[0143] Where Le is the maximum outer radius of nut 2062;

[0144] The thickness of flange 2013 is initially calculated based on the design thickness of end cap 207. The finite element model is constructed using the irregular flange 201 and stiffener 202 as a whole, and the stress distribution is calculated using the elastic stress analysis method. The overall membrane stress intensity and the combined membrane and bending stress intensity of the irregular flange 201 are calculated. If the stress intensity exceeds the stress intensity limit, the calculation is repeated by increasing the thickness of flange 2013 and / or increasing the thickness of stiffener 202 and / or increasing the number of stiffener 202 up to the maximum number of studs 2061, until the overall membrane stress intensity is less than the stress intensity limit and the combined membrane and bending stress intensity is less than the stress intensity limit. The final thickness of flange 2013 is then obtained under the condition that the overall membrane stress intensity is less than the stress intensity limit and the combined membrane and bending stress intensity is less than the stress intensity limit.

[0145] Specifically, the thickness δf of the flange 2013 of the irregular flange 201 is determined through trial calculation: First, the initial thickness of the flange 2013 is assumed to be the thickness δpn of the end cap 207, i.e., δf = δpn = 34mm. By modeling the irregular flange 201 and the stiffener 202 as a whole using finite element method and calculating the stress distribution using elastic stress analysis, and classifying the stress distribution according to Section 5.2 of JB4732-1995, the primary overall membrane stress intensity SI and the primary membrane plus primary bending stress intensity SIII of the irregular flange 201 are calculated. By increasing the thickness of the flange 2013 and / or increasing the thickness of the stiffener 202 and / or increasing the number of stiffeners 202 with the number of studs 2061 as the upper limit, repeated calculations are performed. When the calculation results satisfy that the primary overall membrane stress intensity SI is less than the stress intensity limit value KSm, and the primary membrane plus primary bending stress intensity SIII is less than the stress intensity limit value 1.5KSm, the thickness δf = 34mm of the flange 2013 of the irregular flange 201 meets the strength requirements.

[0146] As can be seen from the above, the thickness of the body 2011, the positioning ring 2012, the flange 2013, the stiffening plate 202, and the end cover 207 in the irregular flange 201 can all be obtained through relevant calculations. While meeting the strength requirements of the outlet collector, the design of the relevant dimensions of each structure is optimized, and the manufacturing cost is reduced.

[0147] Optionally, ΔW, the slit width of the horizontal bars of the Johnson screen, is calculated using the following formula:

[0148] ΔW = W2 - W1 < dpmin;

[0149] Among them, the minimum particle size dpmin of non-passing particles in the Johnson mesh during the process operation, W1 is the width of the horizontal sieve bar of the Johnson mesh, W2 is the arrangement spacing of the horizontal sieve bar of the Johnson mesh, and the slit width ΔW is less than the minimum particle size dpmin of non-passing particles in the process operation.

[0150] The aperture ratio η of the Johnson mesh is calculated using the following formula:

[0151]

[0152] The cylindrical diameter Dy of the Johnson net is calculated using the following formula:

[0153] Dy≤Db-dbmax-2×hz-2×hs;

[0154] Where dbmax is the maximum outer diameter of the thread of stud 2061, hz is the height of the horizontal screen bar of Johnson mesh, and hs is the height of the vertical support rod of Johnson mesh.

[0155] Specifically, refer to Figure 8As shown, the selection of Johnson mesh in collecting element 209 is as follows: the horizontal screen bar 210 of Johnson mesh is selected as 93#, with a corresponding width W1 = 2.2mm and height hz = 3.55mm; the vertical support rod 211 of Johnson mesh is selected as 118#, with a corresponding specification of width Ws = 3mm and height hs = 4.62mm; the arrangement spacing of the horizontal screen bar 210 of Johnson mesh is W2 = 4.2mm; the minimum particle size of non-passable particles in the process operation is dpmin = 2.5mm; the design of the slot width of the horizontal screen bar 210 of Johnson mesh is ΔW = W2 - W1 = 4.2 - 2.2 = 2mm < dpmin; ΔW meets the process requirements.

[0156] The aperture ratio of the Johnson mesh in collecting element 209 is η:

[0157]

[0158] The diameter Dy of the cylindrical Johnson net:

[0159] Dy≤Db-dbmax-2×hz-2×hs=372-20-2×3.55-2×4.62=335.66

[0160] Among them, the maximum thread outer diameter of stud 2061 is dbmax = 20mm, and the actual cylindrical diameter of Johnson mesh is Dy = 300mm.

[0161] Optional, refer to Figure 2 , Figures 5-8 As shown, the total flow area of ​​the collecting element 209 is S:

[0162] S=(Sdn-ΔSdn1+ΔSdn2)+M×(Sdm-ΔSdm1+ΔSdm2)+(Sdt-ΔSdt1+ΔSdt2)≥So;

[0163] Where M is the number of intermediate layer collection elements 204, M≥0;

[0164] SDN represents the nominal circulating area of ​​Johnson Web 2032, which is the underlying collection element 203:

[0165] Sdn = π × Dy × Hd × η, where Hd is the cylindrical height of the Johnson net 2032 of the bottom collection element 203;

[0166] ΔSdn1 represents the nominal flow area of ​​the Johnson net obscured by the external connector 2033 in the bottom-level collection element 203.

[0167] ΔSdn1=π×Dy×ΔHd×η, where ΔHd is the height of the cylinder of the Johnson net 2032 of the bottom collection element 203 that is blocked by the external connector 2033;

[0168] ΔSdn2 is the increased flow area in the bottom collection element 203 due to the opening of multiple first flow holes 2034 in the external connector 2033;

[0169] SDM collects the nominal circulating area of ​​element 204 in Johnson's net 2042 for each intermediate layer:

[0170] Sdm = π × Dy × Hm × η, where Hm is the cylindrical height of the Johnson net 2042 for each intermediate layer collecting element 204;

[0171] ΔSdm1 is the nominal flow area of ​​the Johnson net obscured by the transition connector 2031 in each intermediate layer collecting element 204:

[0172] ΔSdm1=π×Dy×ΔHm×η, where ΔHm is the height of the cylinder of the Johnson net of each intermediate layer collecting element 204 that is shielded by the transition connector 2031;

[0173] ΔSdm2 is the increased flow area in each intermediate layer collecting element 204 due to the multiple second flow holes 2035 opened by the transition connector 2031;

[0174] Sdt represents the nominal circulating area of ​​Johnson Net 2052 for top-level collection element 205:

[0175] Sdt = π × Dy × Ht × η, where Ht is the cylindrical height of the Johnson net 2052 of the top-level collecting element 205;

[0176] ΔSdt1 is the nominal flow area of ​​the Johnson net in the top-level collecting element 205 that is obscured by the external connector 2033 and the transition connector 2031.

[0177] ΔSdt1=π×By×ΔHt×η, where ΔHt is the height of the cylinder of the Johnson net 2052 of the top-level collecting element 205 that is blocked by the external connector 2033 and the transition connector 2031;

[0178] ΔSdt2 is the increased flow area in the top layer collecting element 205 due to the multiple first flow holes 2034 opened in the external connector 2033 and the multiple second flow holes 2035 opened in the transition connector 2031;

[0179] So, the required flow area for the exit collector 2 is designed as follows: di is the inner diameter of the equipment fitting pipe 1 on the equipment body 5 connected to the outlet collector 2.

[0180] Specifically, the inner diameter di of the connecting pipe 1 is 248mm. Calculations show that the required flow area So for the outlet collector 2 is: Actual value So = 110000 mm 2 .

[0181] The cylindrical height of the Johnson net 2032 of the bottom collecting element 203 is Hd = 60 mm, the cylindrical height of the Johnson net 2042 of each intermediate collecting element 204 is Hm = 60 mm, and the cylindrical height of the Johnson net 2052 of the top collecting element 205 is Ht = 70 mm.

[0182] The external connector 2033 is inserted into the cylindrical Johnson net to a depth of 10 mm, and each transition connector 2031 is inserted into the adjacent cylindrical Johnson net to a depth of 10 mm. The Johnson net 2032 in the bottom layer collection element 203 corresponds to the obscured cylindrical height ΔHd = 10 mm. The Johnson net 2042 in each intermediate layer collection element 204 corresponds to the obscured cylindrical height ΔHm = 10 mm. The Johnson net 2052 in the top layer collection element 205 corresponds to the obscured cylindrical height ΔHt = 10 + 10 = 20 mm.

[0183] In both the bottom collecting element 203 and the top collecting element 205, ten φ2x5 elongated oval first flow holes 2034 are provided on the outer peripheral surface of the external connector 2033 that is blocked when the external connector 2033 is inserted into the cylindrical Johnson net. In both the bottom collecting element 203 and the transition connector 2031 of each intermediate layer collecting element 204, ten φ2x5 elongated oval second flow holes 2035 are provided on the outer peripheral surface of the transition connector 2031 that is blocked when the transition connector 2031 is inserted into the cylindrical Johnson net.

[0184] The nominal circulating area Sdn of the Johnson Net 2032 of the underlying collection element 203 is:

[0185] Sdn=π×Dy×Hd×η=π×300×60×0.476=26917mm 2

[0186] The nominal flux area ΔSdn1 of the Johnson net, which is obscured by the external connector 2033 in the bottom-level collecting element 203, is:

[0187] ΔSdn1=π×Dy×ΔHd×η=π×300×10×0.476=4486mm 2

[0188] The increased flow area ΔSdn2 in the bottom collecting element 203 due to the multiple first flow holes 2034 opened in the external connector 2033 is:

[0189]

[0190] Each intermediate layer collecting element 204 corresponds to the nominal flow area Sdm of the Johnson Network:

[0191] Sdm=π×Dy×Hm×η=π×300×60×0.476=26917mm 2 ,

[0192] The nominal flow area ΔSdm1 of the Johnson net obscured by the transition connector 2031 in each intermediate layer collecting element 204 is:

[0193] ΔSdm1=π×Dy×ΔHm×η=π×300×10×0.476=4486mm 2 ,

[0194] The increased flow area ΔSdm2 in each intermediate layer collecting element 204 due to the multiple second flow holes 2035 opened by the transition connector 2031 is:

[0195]

[0196] The nominal circulating area Sdt of the Johnson Web 2052 for the top-level collecting element 205 is:

[0197] Sdt=π×Dy×Ht×η=π×300×70×0.476=31403mm 2 ,

[0198] The nominal flow area ΔSdt1 of the Johnson net in the top-level collecting element 205, which is obscured by the external connector 2033 and the transition connector 2031, is:

[0199] ΔSdt1=π×Dy×ΔHt×η=π×300×20×0.476=8972mm 2 ,

[0200] The increased flow area ΔSdt2 in the top-layer collecting element 205 due to the multiple first flow holes 2034 in the external connector 2033 and the multiple second flow holes 2035 in the transition connector 2031 is:

[0201]

[0202] The total flow area S of collecting element 209 is the total flow area of ​​bottom collecting element 203 + 3 intermediate collecting elements 204 + top collecting element 205:

[0203] S=(Sdn-ΔSdn1+ΔSdn2)+M×(Sdm-ΔSdm1+ΔSdm2)+(Sdt-ΔSdt1+ΔSdt2)

[0204] =(26917-4486+131)+3×(26917-4486+131)+(31403-8972+262)=112941mm 2

[0205] The required circulation area is S≥So.

[0206] As can be seen from the above, the opening ratio η and total flow area S of the Johnson screen of the outlet collector 2 can be obtained through relevant calculations, which ensures the filtration efficiency and collection efficiency, thus making the process performance of the outlet collector 2 reliable.

[0207] In summary, the outlet collector of this invention utilizes a detachable positioning structure on the outside of the end cap to clamp and fix the outlet collector. This positioning structure distributes the force to the device body connected to the outlet collector. Furthermore, it employs multi-layer collection elements as a filtration and collection structure, replacing the existing ring plate structure which lacks rigidity, thus improving the rigidity of the outlet collector. The opening ratio and total flow area of ​​the Johnson screen in the collection elements are obtained through relevant formulas, ensuring filtration and collection efficiency, and guaranteeing reliable process performance.

[0208] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A detachable outlet collector, characterized in that, The outlet collector includes: An irregular flange, the irregular flange comprising a cylindrical body, one end of the body having a flange and a positioning ring in the middle; The collection element includes a top collection element and a bottom collection element arranged sequentially from top to bottom, and the bottom collection element is connected to the flange. End cap, the end cap being connected to the top-layer collecting element; A positioning structure is provided on the outside of the end cap to clamp and fix the outlet collector and is detachably connected to the end cap. A plurality of first fasteners, each first fastener comprising a stud and a nut; Multiple first bolt holes are provided circumferentially on the contact surfaces between the irregular flange, the collecting element, and the end cap. The stud passes through the first bolt holes of the irregular flange, the collecting element, and the end cap in sequence and is screwed to fix the irregular flange, the collecting element, and the end cap. A tapered neck is provided between the outer periphery of the body and the bottom surface of the flange; The design thickness of the end cap The following formula is used to calculate: ； in, C1 is the calculated thickness of the end cap, C2 is the negative thickness deviation of the material used for the end cap, and C2 is the one-sided corrosion allowance of the end cap. The calculated thickness of the end cap The following formula is used to calculate: ； Where Db is the diameter of the bolt circle formed by the plurality of studs. The equivalent circular plate, with the bolt circle as the simply supported circle of the end cap, is based on the pressure difference between the inlet and outlet of the equipment body as the uniform pressure on the equivalent circular plate. The allowable stress of the material used for the end cap at the design temperature; The diameter Db of the bolt circle is calculated using the following formula: ； Wherein, Nb is the number of studs, L1 is the minimum circumferential arc distance required for the studs to meet the loading and unloading operation, Dm is the large end diameter of the conical neck, and LA is the minimum radial distance required for the studs to meet the loading and unloading operation.

2. The detachable outlet collector according to claim 1, characterized in that, The positioning structure includes a pair of top plates, two pairs of vertical plates, clamping bolts, and a second fastener, wherein the second fastener includes an inner bolt and an inner nut. The top plate has a bolt hole in the center and bent edges at both ends, with bolt holes in the bent edges. A bolt hole is provided at the center of the top surface of the end cap, and the clamping bolt is inserted into the bolt hole at the center of the top plate and the bolt hole at the center of the top surface of the end cap and screwed in for fixation; The bottom of the upright plate is connected to the equipment body, and the top of the upright plate has bolt holes and is screwed to the bent edge of the top plate by the second fastener.

3. The detachable outlet collector according to claim 1, characterized in that, At least one intermediate layer collection element is provided between the top layer collection element and the bottom layer collection element; The top-level collecting element, the intermediate-level collecting element, and the bottom-level collecting element all include a Johnson net, which is a cylindrical structure. The bottom-level collecting element and the top-level collecting element all include external connectors, which are cylindrical structures. One end of the external connector extends horizontally outward along the edge of the cylinder opening and is provided with an outer ring. Multiple first bolt holes are provided on the circumferential surface of the outer ring. Multiple first flow holes with equal area are provided on the outer circumferential surface of the external connector. The outer edge of the bottom collecting element, away from the outer ring, extends along the inner sidewall of the bottom of the bottom collecting element and is welded and fixed to the vertical support rod of the Johnson mesh of the bottom collecting element. The other end of the bottom collecting element can be fixed to the flange by passing the stud through the first bolt hole of the outer ring. The outer edge of the top-level collecting element, away from the outer ring, extends along the inner sidewall of the top of the top-level collecting element and is welded and fixed to the vertical support rod of the Johnson net of the top-level collecting element. The other end of the top-level collecting element can be fixed to the end cap by passing the stud through the first bolt hole of the outer ring. The bottom collecting element and each of the intermediate collecting elements are also provided with a transition connector. The transition connector is a cylindrical structure, and a plurality of second flow holes with equal area are provided on the outer circumferential surface of the transition connector. The two ends of the transition connector are welded and fixed to the vertical support rods of the Johnson net of the two adjacent layers of the collection element, respectively. The first flow hole and the second flow hole are respectively offset from the vertical support rods on the Johnson net, and the first flow hole and the second flow hole are in the same vertical position.

4. The detachable outlet collector according to claim 1, characterized in that, The irregular flange also includes multiple stiffening plates, which are evenly distributed along the outer periphery of the body. The cross-section of the stiffening plate is trapezoidal. The top edge of the stiffening plate is connected to the bottom surface of the flange, the bottom edge of the stiffening plate is connected to the top surface of the positioning ring, and the inner side of the stiffening plate is connected to the outer periphery of the body.

5. The detachable outlet collector according to claim 4, characterized in that, The number of stiffeners is less than or equal to the number of studs; The thickness of the stiffener is greater than or equal to the thickness of the body.

6. The detachable outlet collector according to claim 5, characterized in that, The outer diameter Do of the irregular flange is calculated using the following formula: ； Where Le is the maximum outer radius of the nut; The thickness of the flange is initially calculated based on the design thickness of the end cap. The flange and stiffener are modeled as a whole using finite element analysis, and the stress distribution is calculated using elastic stress analysis. The overall membrane stress intensity and the combined membrane and bending stress intensity of the flange are calculated. When the stress intensity exceeds the stress intensity limit, the flange thickness and / or the stiffener thickness and / or the number of stiffeners is increased up to the maximum number of studs for repeated calculations until the overall membrane stress intensity is less than the stress intensity limit and the combined membrane and bending stress intensity is less than the stress intensity limit, thus obtaining the final thickness of the flange.

7. The detachable outlet collector according to claim 3, characterized in that, The slit width ΔW of the horizontal bars of the Johnson mesh is calculated using the following formula: ； Wherein, dpmin is the minimum particle size of the non-passing particles in the Johnson mesh during the process operation, W1 is the width of the horizontal sieve bar of the Johnson mesh, W2 is the arrangement spacing of the horizontal sieve bar of the Johnson mesh, and the slit width ΔW is less than the minimum particle size of the non-passing particles in the process operation, dpmin. The porosity η of the Johnson mesh is calculated using the following formula: ； The cylindrical diameter Dy of the Johnson net is calculated using the following formula: ； Wherein, dbmax is the maximum outer diameter of the thread of the stud, hz is the height of the horizontal screen bar of the Johnson mesh, and hs is the height of the vertical support rod of the Johnson mesh.

8. The detachable outlet collector according to claim 7, characterized in that, The total flow area of ​​the collecting element is S: ； Where M is the number of the intermediate layer collection elements, M≥0; Sdn is the nominal flow area of ​​the Johnson net of the underlying collection element: Hd is the cylindrical height of the Johnson mesh of the bottom collection element; △Sdn1 represents the nominal flow area of ​​the Johnson net obscured by external connectors in the underlying collection element: △Hd is the height of the cylinder of the Johnson mesh of the bottom collection element that is blocked by the external connector; △Sdn2 is the increased flow area in the bottom collection element due to the opening of multiple first flow holes in the external connector; Sdm collects the Johnson net nominal flow area of ​​each of the intermediate layer elements: Hm is the cylinder height of the Johnson mesh for each of the intermediate layer collecting elements; △Sdm1 is the nominal flow area of ​​the Johnson net obscured by the transition connector in each of the intermediate layer collecting elements: △Hm is the height of the cylinder obscured by the transition connector for each Johnson mesh of the intermediate layer collecting element; △Sdm2 is the increased flow area in each of the intermediate layer collection elements due to the opening of multiple second flow holes in the transition connector; Sdt is the nominal flow area of ​​the Johnson net for the top-level collection element: Ht is the cylindrical height of the Johnson mesh of the top-level collecting element; △Sdt1 is the nominal flow area of ​​the Johnson net obscured by the external connectors and transition connectors in the top-level collecting element: △Ht is the height of the cylinder of the Johnson mesh of the top-level collecting element that is obscured by the external connectors and transition connectors; △Sdt2 is the increased flow area in the top-level collecting element due to the multiple first flow holes opened in the external connector and the multiple second flow holes opened in the transition connector; So, design the required flow area for the outlet collector: ; Wherein, di is the inner diameter of the fitting pipe of the device connected to the outlet collector.

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