Flow guide disc and DTRO (Disk Tubular Reverse Osmosis) membrane assembly comprising same

Abstract

The invention belongs to the technical field of wastewater treatment devices, and particularly relates to a flow guide disc and a DTRO (Disk Tubular Reverse Osmosis) membrane assembly comprising the flow guide disc. The structure of the flow guide disc comprises a stacked outer ring, an annular body and a hemispherical convex point, and further comprises a fixed convex block and a clamping groove which are respectively arranged on two opposite side surfaces of the stacked outer ring, the combined radial positioning block unit is arranged on the annular body and is used for improving the radial stability and the annular stability of the flow guide disc in the mode that the combined radial positioning block unit is connected with the outer ring face of a sealing ring in an abutting mode and the mode that waste water is guided to a gap between the annular body and the sealing ring.

Description

Technical Field

[0001] This application belongs to the technical field of wastewater treatment devices, and particularly relates to a flow guide plate and a DTRO membrane module including the flow guide plate. Background Technology

[0002] DTRO, or disc tube reverse osmosis, is a specially designed reverse osmosis membrane separation technology.

[0003] The DTRO membrane module mainly consists of a cylindrical body, a central tie rod, a sealing ring, a flow guide plate, and a DTRO membrane pack. The working principle of the DTRO membrane module is as follows: wastewater undergoes reverse osmosis at the DTRO membrane pack. The sealing ring separates the purified water from the wastewater, and the flow guide plate guides the wastewater through an "S"-shaped path, thus achieving a more complete reverse osmosis effect on the DTRO membrane pack.

[0004] On the other hand, the aforementioned flow guide plate mainly consists of an outer ring, a body, and protrusions on the body. The outer ring is used to seal and block wastewater, the body is used for flow guidance, and the protrusions can create turbulence in the wastewater, thereby increasing the permeability of the wastewater on the DTRO membrane.

[0005] For example, Chinese utility model patent with authorization announcement number CN212356642U and authorization announcement date of January 15, 2021, discloses a flow guide plate for DTRO membrane modules. Its structure mainly includes: flow guide plate body, sealing plate mounting hole, sealing plate, flow guide plate, protrusion, flow guide cavity, water passage hole, mounting hole, positioning shaft, positioning groove, sealing ring groove, sealing ring, and positioning point.

[0006] The advantages of the flow guide plate in this utility model patent are as follows: when the filtrate passes through the flow guide plate and the protrusions, it will generate turbulence rapidly, causing the filtrate to roll, thereby strengthening the scouring of the membrane, reducing the impact of concentration polarization on the membrane, effectively preventing membrane fouling and improving the filtration effect.

[0007] However, in actual use, this guide plate still has at least the following instability issues, specifically: When multiple guide plates are stacked vertically, only the axial stability is sufficient in the three directions of axial, radial, and circumferential because of the direct fastening effect at the end of the DTRO membrane module. However, the force that restricts the radial sliding and circumferential rotation of any one of the guide plates still comes from the aforementioned end fastening effect. This is indirect and passive, relying on indirect static friction, which is far from enough. Ultimately, this can easily lead to water leakage at the gap formed by adjacent guide plates, resulting in a reduction in reverse osmosis efficiency. Summary of the Invention

[0008] This application provides a flow guide plate, the technical problem to be solved by which the flow guide plate, when used in a DTRO membrane module, has the effect of directly and actively restricting its radial sliding displacement and circumferential rotational displacement, so as to avoid obvious water leakage at the gap formed by the upper and lower adjacent flow guide plates.

[0009] In addition, this application also provides a DTRO membrane module including the above-mentioned flow guide plate.

[0010] The technical solution adopted by this application to solve the above problems is: a flow guide plate, the structure of which includes a stacked outer ring, a circular annular body, and hemispherical protrusions, and further includes fixing protrusions and engaging grooves respectively disposed on two opposite sides of the stacked outer ring, and a combined radial positioning block unit disposed on the circular annular body and guided to the gap between the circular annular body and the sealing ring by abutting against the outer ring surface, in order to improve the radial stability and circumferential stability of the flow guide plate.

[0011] A further preferred technical solution is that the combined radial positioning block unit includes a radial protrusion block disposed on the inner ring surface of the annular body and used to abut against the outer ring surface of the sealing ring, and a blocking guide strip disposed on the annular body, located radially inside the hemispherical protrusion, and located above the engaging groove along with the fixing protrusion, and used to reduce the impact intensity of wastewater on the sealing ring by guiding wastewater between two adjacent radial protrusion blocks.

[0012] A DTRO membrane assembly including the flow guide plate has a structure comprising a sealing ring, a DTRO membrane package, a lower flange for inlet and outlet water ends, an upper flange, and a cylindrical shell. It also includes a bidirectional pad unit disposed on the upper surface of the lower flange for inlet and outlet water ends, which is used to improve the stability of the flow guide plate column by vertically supporting the DTRO membrane package and radially engaging the sealing ring and the annular body. It also includes a combined protrusion unit disposed on the lower surface of the upper flange for pressing down the stacked outer ring and the sealing ring.

[0013] A further preferred technical solution is that the bidirectional pad unit includes an annular pad disposed on the upper surface of the lower flange at the inlet and outlet ends, and used to fill the height difference between the lower surface of the lower sealing ring and the upper surface of the lower flange at the inlet and outlet ends by supporting the lowermost sealing ring.

[0014] A further preferred technical solution is that the bidirectional pad unit further includes a fan-shaped vertical block disposed on the upper surface of the annular pad, which is circumferentially offset from the combined radial positioning block unit and is used to simultaneously engage the inner annular surface of the annular body and the outer annular surface of the sealing ring.

[0015] A further preferred technical solution is that the combined bump unit includes an annular bump disposed on the lower surface of the upper flange and used to press down the sealing ring, and a plurality of radially outer bumps disposed on the lower surface of the upper flange and used to press down the stacked outer ring and for wastewater to pass through the circumferential gap.

[0016] A further preferred technical solution includes: an annular protrusion plate disposed on the inner ring surface of the outer shell of the cylinder, and a cylinder sealing ring disposed on the lower surface of the annular protrusion plate and clamped by the lower flange of the inlet and outlet water ends.

[0017] A further preferred technical solution is that the radial dimension between the inner ring surface of the annular protrusion plate and the outer ring surface of the stacked outer ring is 20.0-25.0 mm, and the lower surface of the annular protrusion plate blocks wastewater to improve the circumferential uniformity of wastewater when it leaves the wastewater channel.

[0018] A further preferred technical solution is that the radial outer side surface of the radial outer protrusion is conical, and before the guide plate and DTRO membrane are installed, the upper flange is used to fix the inner ring surface of the annular protrusion plate by engaging the outer ring surface of the radial outer protrusion with the inner ring surface of the annular protrusion plate.

[0019] A further preferred technical solution includes: two external threaded rings screwed onto the inner ring surface of the outer shell of the cylinder and used to axially clamp the lower flange and upper flange of the water inlet and outlet ends, respectively; and radially inward protrusions and / or radially outward slots disposed on the inner ring surface of the external threaded rings and used to rotatably tighten the external threaded rings, wherein the radially outward slots expose the water inlet and outlet cavities on the lower flange of the water inlet and outlet ends.

[0020] The beneficial effects of this application include at least the following seven points.

[0021] First, for each guide plate, it has the effect of directly and actively restricting its radial sliding displacement and circumferential rotational displacement. The above effect is achieved primarily by: the fixed protrusion and the engaging groove interlocking with each other, and the combined radial positioning block unit abutting against the outer ring surface of the sealing ring.

[0022] Therefore, in the radial direction, the combined radial positioning block unit always radially abuts against the relatively stable vertical sealing ring column, making it difficult for the guide plate to slide out radially; in the circumferential direction, as long as the engagement state of the fixed protrusion and the locking groove is not released, the guide plate is also relatively difficult to rotate circumferentially, ultimately improving the relative positional stability of the upper and lower adjacent guide plates and avoiding obvious water leakage at the gaps of the guide plates.

[0023] Secondly, for the combined radial positioning block unit, the term "combined" means that it can improve the radial stability of the guide plate in an overall and comprehensive manner in terms of both "structure" and "force", as detailed below.

[0024] The radial protrusion directly abuts against the relatively stable vertical sealing ring column in terms of "structure". However, at this time, it has become a "bridge" that allows the wastewater flow to impact the vertical sealing ring column significantly and directly. This is disadvantageous. The impact force has a relatively small effect on the stability of the sealing ring. However, for the guide plate, the reaction force of the impact force can significantly cause the guide plate to slide radially and / or rotate circumferentially, which needs to be avoided.

[0025] Therefore, the radial protrusions combined with the blocking guide strips make it difficult for wastewater to directly impact the sealing ring. Instead, the wastewater flows downward between two adjacent radial protrusions and in the gap between the annular body and the sealing ring. This can significantly reduce the adverse effects of the "bridge" factor mentioned above, ultimately improving the positional stability of the guide plate and preventing obvious leakage at the gap between the upper and lower guide plates.

[0026] Third, the bidirectional pad unit in the DTRO membrane module can directly limit the flow guide plate and the sealing ring radially, and can also stabilize the sealing ring column itself by vertically clamping the sealing ring, which indirectly strengthens the flow guide plate column.

[0027] Fourth, the combined bump unit in the DTRO membrane module serves the dual function of vertically clamping the guide plate and sealing ring, which indirectly and directly ensures that the gap between the upper and lower guide plates is not prone to leakage.

[0028] Fifth, the annular protrusion in the DTRO membrane module has at least the following three functions: installing the cylinder sealing ring; blocking and thus relatively quickly and thoroughly distributing wastewater in the circumferential direction; and before the membrane module is used, it is used to engage the upper flange that would otherwise slide freely, so that the combined protrusion unit is not easily damaged, which also helps to stabilize the guide plate column.

[0029] Sixth, the two external threaded rings can fully and completely clamp the lower and upper flanges at the inlet and outlet, giving the guide plate column sufficient and appropriate axial clamping strength.

[0030] Seventh, the external threaded ring has the dual advantages of simple and efficient rotary clamping operation, and does not affect the inlet and outlet water operation of the DTRO membrane module. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the flow guide plate in this application.

[0032] Figure 2This is a schematic diagram of the engagement method between the fixing protrusion and the engaging groove in this application.

[0033] Figure 3 This is a schematic diagram of the appearance of the DTRO membrane module in this application.

[0034] Figure 4 This is a schematic diagram showing the location of the DTRO membrane module in this application.

[0035] Figure 5 This is a schematic diagram of the DTRO membrane module in this application.

[0036] Figure 6 This is a schematic diagram of the position and structure of the bidirectional pad unit in this application.

[0037] Figure 7 This is a schematic diagram of the positional structure of the combined bump unit in this application.

[0038] Figure 8 This is a schematic diagram illustrating the use of the annular protruding plate to block wastewater in this application.

[0039] Figure 9 This is a schematic diagram illustrating the usage method of the DTRO membrane module in this application, in which the annular protrusion plate fixes the upper flange before use to avoid damage to the upper flange and the combined protrusion unit.

[0040] Figure 10 for Figure 9 A magnified view of the area circled in the middle.

[0041] Figure 11 This is a schematic diagram showing the position and shape of the radially inward protrusion in this application.

[0042] Figure 12 This is a schematic diagram showing the location and shape of the radially outward slot in this application.

[0043] Figure 13 This is a schematic diagram of a DTRO membrane package in the prior art.

[0044] Figure 14 This is a schematic diagram of one structure of the outer shell of the cylinder in this application.

[0045] The meanings of the markings in the diagram are as follows.

[0046] DTRO membrane module a, sand filter tank b, cleaning module c, instrumentation module d, control cabinet module e; Wastewater inlet direction f, wastewater circumferential distribution direction g, wastewater upward flow direction h; 1. Stacked outer ring; 2. Circular body; 3. Hemispherical protrusion; 4. Fixing protrusion; 5. Engaging groove; 6. Combined radial positioning block unit; 7. Radial guide strip. Radial protrusion (601), blocking guide strip (602); 11. Sealing ring, 12. DTRO membrane pack, 13. Lower flange at inlet and outlet, 13-1. Wastewater channel, 13-2. Clean water channel, 13-3. Concentrate channel, 14. Upper flange, 17. Shell, 17-1. Threaded section, 17-2. Smooth section, 23. Central tie rod, 24. Fastening nut. Two-way pad unit 15, combined protrusion unit 16, annular protrusion plate 18, cylinder sealing ring 19, external threaded ring 20, radially inward protrusion 21, radially outward slot 22; Circular ring pad 15-1, fan-shaped vertical block 15-2; Circular protrusion 16-1, radially outer protrusion 16-2, arc-shaped groove 16-3. Detailed Implementation

[0047] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.

[0048] like Figures 1-14 As shown, a flow guide plate includes a stacked outer ring 1, an annular body 2, and hemispherical protrusions 3. It also includes fixing protrusions 4 and engaging grooves 5 respectively disposed on two opposite sides of the stacked outer ring 1, and a combined radial positioning block unit 6 disposed on the annular body 2 and guided to the gap between the annular body 2 and the sealing ring 11 by abutting against the outer ring surface of the sealing ring 11, in order to improve the radial and circumferential stability of the flow guide plate.

[0049] In this embodiment, several guide discs and sealing rings 11 are stacked vertically to form the aforementioned guide disc column and sealing ring column. (See attached diagram) Figure 5 As shown, the aforementioned fastening nut 24 directly clamps the sealing ring 11, and its own size is relatively small. Therefore, the stability of the sealing ring column is much greater than that of the flow guide plate column. The key to improving the reverse osmosis efficiency of this DTRO membrane module is to improve the stability of the flow guide plate column.

[0050] During installation, the fixing protrusion 4 is positioned on top and the engaging groove 5 is positioned on the bottom. The engaging groove 5 of the upper guiding plate is engaged by the fixing protrusion 4 of the lower guiding plate, ensuring relatively high circumferential stability for both.

[0051] As for the combined radial positioning block unit 6, its functions include at least the following two: First, in terms of its "structure", it directly abuts against the relatively stable vertical sealing ring column, ensuring that the guide plate column has basic radial stability. Secondly, in terms of "force," it minimizes the harmful "bridge" effect caused by the direct contact relationship. The reaction force generated by the wastewater flow directly impacting the sealing ring column on the "bridge" can significantly cause the guide plate to slide out radially and / or rotate circumferentially.

[0052] Ultimately, the wastewater flows out more and more noticeably downwards through the gap between the annular body and the sealing ring. This effectively reduces the adverse effects of the "bridge" factor mentioned above, thereby improving the positional stability of the guide plate column and preventing significant leakage at the gap between the upper and lower guide plates.

[0053] It should be noted that the aforementioned guide plate column and sealing ring column are stacked together. The engaging effect between the fixing protrusion 4 and the engaging groove 5, as well as the abutting relationship between the combined radial positioning block unit 6 and the sealing ring 11, can provide a coordinated positioning effect when each guide plate and each sealing ring 11 is installed, ultimately resulting in: First, the outer circumference of all guide vanes is fully radially aligned; Second, the outer annular surfaces of all sealing rings 11 are fully radially aligned; Third, the central axes of the flow guide column, the sealing ring column, and the DTRO membrane module shell are fully aligned.

[0054] Correspondingly, at this point, for the guide plate column, wastewater is unlikely to leak inward or outward at the gaps in the guide plate; for the sealing ring column, wastewater is unlikely to leak inward or clean water is unlikely to leak outward at the gaps between the sealing ring and the DTRO membrane pack. Of course, the pressure between the sealing ring and the DTRO membrane pack must be sufficient and appropriate to ensure that the above-mentioned leakage does not occur, and also to ensure that clean water can be collected internally within the DTRO membrane pack itself.

[0055] The fixed protrusion 4 is hemispherical in shape, and the engaging groove 5 is circular in shape to match it. Two to five fixed protrusions 4 are provided on a single guide plate.

[0056] The combined radial positioning block unit 6 includes a radial protrusion 601 disposed on the inner ring surface of the annular body 2 and used to abut against the outer ring surface of the sealing ring 11, and a blocking guide strip 602 disposed on the annular body 2, located radially inside the hemispherical protrusion 3, and located above the engaging groove 5 along with the fixing protrusion 4, and used to reduce the impact intensity of wastewater on the sealing ring 11 by guiding wastewater between two adjacent radial protrusions 601.

[0057] In this embodiment, the radial protrusion 601 is fan-shaped and there are 2-5 of them. The sum of the center angles of the protrusions is ≤90°, thereby avoiding a significant reduction in the wastewater flow rate between the guide plate and the sealing ring 11.

[0058] Furthermore, the shape of the blocking guide strip 602 is semi-circular or V-shaped, with its opening facing the radial protrusion 601. Its opening width is greater than or equal to the distance between the two endpoints on the radially outer annular edge of the radial protrusion 601. For details, please refer to the appendix. Figure 1 .

[0059] The radial outer side of the blocking guide strip 602 is used to guide wastewater between two circumferentially adjacent radial protrusions 601, so that when the wastewater leaves the upper surface of the annular body 2, it flows downward more often than directly impacts the sealing ring 11.

[0060] Correspondingly, the obstruction-type guide strip 602 is not provided or needs to be provided on the lower surface of the annular body 2.

[0061] The vertical protrusion of the blocking guide strip 602 is 2.0-2.5mm.

[0062] A DTRO membrane assembly including the aforementioned flow guide plate has a structure comprising a sealing ring 11, a DTRO membrane package 12, a lower flange 13 for inlet and outlet water ends, an upper flange 14, and a cylindrical shell 17. It also includes a bidirectional pad unit 15 disposed on the upper surface of the lower flange 13 for inlet and outlet water ends, which is used to improve the stability of the flow guide plate column by vertically supporting the DTRO membrane package 12 and radially engaging the sealing ring 11 and the annular body 2, and a combined protrusion unit 16 disposed on the lower surface of the upper flange 14 for pressing down the stacked outer ring 1 and the sealing ring 11.

[0063] In this embodiment, the improvement direction of this DTRO membrane module compared with existing common similar products is still how to improve the structural stability of the above-mentioned flow guide plate column and sealing ring column, and avoid water leakage from the internal gaps of these two.

[0064] The sealing ring 11, DTRO membrane pack 12, inlet / outlet lower flange 13, upper flange 14, outer shell 17, central tie rod 23, and fastening nut 24 are all commercially available components. For example, the DTRO membrane pack 12 is shown in the attached figure. Figure 13 As shown, the lower flange 13 at the inlet and outlet is provided with necessary and common wastewater channels 13-1, clean water channels 13-2 and concentrate channels 13-3. Two fastening nuts 24 are provided at each end of the central tie rod 23 to fully compress the guide plate column and the sealing ring column.

[0065] In addition, the bidirectional pad unit 15 has at least the following three functions: First, the term "bidirectional" refers to both vertical and radial directions. In the vertical direction, its thickness is used to supplement half the thickness of the DTRO membrane pack 12 below the bottom sealing ring 11, ensuring that the DTRO membrane pack 12 aligns with the guide plate gap in the vertical direction. This makes the impact force on the DTRO membrane pack 12 more uniform and symmetrical when the wastewater flows through the DTRO membrane pack 12 in an "S" shaped path, greatly reducing the probability of the latter experiencing unnecessary harmful vibrations. Secondly, in the radial direction, the sealing ring 11, which is also the first one installed, is positioned so that the sealing ring column and the central tie rod 23 are in a positional relationship that coincides with the central axis. This is also beneficial to the structural stability of the sealing ring column and the guide plate column. Third, in the radial direction, the bottommost and first installed guide plate is positioned so that the guide plate column and the central tie rod 23 are aligned with the central axis, which is beneficial to the structural stability of the guide plate column and the sealing ring column.

[0066] On the other hand, the main function of the combined bump unit 16 is to apply a sufficient and appropriate vertical clamping force to the upper ends of the guide plate column and the sealing ring column, so that the clamping effect of the fastening nut 24 on the guide plate column and the sealing ring column is more direct and sufficient.

[0067] The bidirectional pad unit 15, the inlet / outlet lower flange 13, the combined protrusion unit 16, and the upper flange 14 are all integrally formed and are all made of high-strength steel.

[0068] The bidirectional pad unit 15 includes an annular pad 15-1 disposed on the upper surface of the lower flange 13 at the inlet and outlet ends, and used to fill the height difference between the lower surface of the lower sealing ring 11 and the upper surface of the lower flange 13 at the inlet and outlet ends by supporting the lowermost sealing ring 11.

[0069] In this embodiment, the thickness of the annular pad 15-1 is half the thickness of the DTRO membrane pack 12 in its compressed working state, for example, 0.4-0.5 mm. At this point, all the DTRO membrane packs 12 are aligned with the guide plate gaps, ensuring the uniformity of the up-and-down movement of the wastewater impacting the DTRO membrane packs 12, making the DTRO membrane packs 12 less prone to harmful swaying and vibration.

[0070] Correspondingly, the inner ring surface of the annular pad 15-1 is flush with the annular surface of the center hole on the lower flange 13 of the inlet and outlet water ends, and its radial dimension is 1.0-1.5cm. It should not be too large, otherwise it will significantly encroach on and reduce the effective filtration space in the DTRO membrane module.

[0071] The bidirectional pad unit 15 further includes a fan-shaped vertical block 15-2 disposed on the upper surface of the annular pad 15-1 and circumferentially offset from the combined radial positioning block unit 6, and used to simultaneously engage the inner annular surface of the annular body 2 and the outer annular surface of the sealing ring 11.

[0072] In this embodiment, when the bottommost sealing ring 11 and the guide plate are installed, the outer ring surface of the former engages with the inner ring surface of the fan-shaped vertical block 15-2, and the inner ring surface of the latter's circular body 2 engages with the outer ring surface of the vertical block 15-2. This ultimately determines a suitable radial installation position for the entire guide plate column and the entire sealing ring column, ensuring the high efficiency and stability of the entire wastewater filtration operation.

[0073] Unlike the annular pad 15-1, wastewater needs to flow downwards at the fan-shaped vertical block 15-2. Therefore, the annular pad 15-1 can be a complete annulus, while the fan-shaped vertical block 15-2 can only be a broken, spaced-out block. See the attached diagram for details. Figure 6 .

[0074] It should be noted that, for the bottommost guide plate, the annular wastewater channel space between the inner ring surface of its annular body 2 and the outer ring surface of the sealing ring 11 is occupied by the radial protrusion 601 and the fan-shaped vertical block 15-2. This is also the reason why the size of the radial protrusion 601 and the fan-shaped vertical block 15-2 should not be too large and the number should not be too many, so as to ensure the fixing effect on the guide plate column and the sealing ring column and not significantly obstruct the normal flow of wastewater.

[0075] Specifically, the number of the fan-shaped vertical blocks 15-2 is, for example, 4, with individual dimensions of: radial thickness 3-5mm, vertical length 0.8-1.0cm, and center angle ≤15°.

[0076] The combined bump unit 16 includes an annular bump 16-1 disposed on the lower surface of the upper flange 14 and used to press down the sealing ring 11, and a plurality of radially outer bumps 16-2 disposed on the lower surface of the upper flange 14 and used to press down the stacked outer ring 1 and to allow wastewater to pass through the circumferential gap.

[0077] In this embodiment, the radially outer protrusion 16-2 needs to pass through the wastewater radially inward, while the annular protrusion 16-1 does the opposite, requiring the wastewater and clean water to avoid mixing. Therefore, the former is in the form of several independent blocks, while the latter is in the shape of a ring.

[0078] On the other hand, the lower surface and the inner ring surface of the annular protrusion 16-1 are together formed with a complete arc-shaped groove 16-3 to upgrade the original single vertical fixation to vertical fixation plus radial fixation, so that the upper end position of the sealing ring column is more stable.

[0079] Similarly, the lower surface and inner ring surface of the radially outer protrusion 16-2 are provided with segmented arc-shaped slots 16-3. Several of these arc-shaped slots 16-3 are concentric and are used to vertically and radially fix the upper end of the flow guide column. For details, please refer to the appendix. Figure 7 .

[0080] The structure of the DTRO membrane module also includes an annular protrusion 18 disposed on the inner ring surface of the outer shell 17, and a shell sealing ring 19 disposed on the lower surface of the annular protrusion 18 and clamped by the inlet / outlet lower flange 13.

[0081] In this embodiment, the annular region between the inner surface of the annular protrusion 18 and the outer surface of the lowermost guide plate is used for the upward passage of wastewater. Therefore, the radial dimension of the annular protrusion 18 should not be too large.

[0082] Accordingly, the annular protrusion 18 and the cylindrical outer shell 17 are integrally formed, and it has at least the following three functions: First, install the cylinder sealing ring 19 to prevent water leakage at the gap between the cylinder shell 17 and the inlet / outlet lower flange 13; Secondly, the blockage further ensures that the wastewater is distributed relatively quickly and thoroughly in the circumferential direction, ultimately making the filtration speed and impurity accumulation speed as consistent as possible in the circumferential direction of the DTRO membrane pack 12, thereby extending the replacement cycle of the DTRO membrane pack 12. Third, before the membrane module is used, its inner ring surface is used to engage the upper flange 14, which would otherwise slide freely, so that the combined protrusion unit 16 is not easily damaged. The direct advantage is that when the membrane module is stored and transported, the upper flange 14, like the lower flange 13 at the inlet and outlet, can be pre-filled in the outer shell 17 of the cylinder, and the upper flange 14 and the combined protrusion unit 16 are not easily damaged. At the same time, the indirect advantage is that it is beneficial to the stability of the guide plate column.

[0083] The cylindrical sealing ring 19 is a commonly used sealing ring part in existing DTRO membrane modules, and its material is generally rubber with excellent weather resistance.

[0084] The radial dimension between the inner ring surface of the annular protrusion 18 and the outer ring surface of the stacked outer ring 1 is 20.0-25.0 mm. The lower surface of the annular protrusion 18 blocks wastewater to improve the circumferential uniformity of wastewater when it leaves the wastewater channel 13-1.

[0085] In this embodiment, the vertical thickness of the cylindrical sealing ring 19 is relatively small, and the height of the upper surface of the annular protrusion 18 generally does not exceed the height of the upper surface of the second guide plate from the bottom.

[0086] The radial outer side of the radial outer protrusion 16-2 is conical. Before the guide plate and DTRO membrane 12 are installed, the upper flange 14 is axially fixed inside the cylindrical shell 17 by engaging the outer ring surface of the radial outer protrusion 16-2 with the inner ring surface of the annular protrusion 18.

[0087] In this embodiment, during storage and transportation, the lower flange 13 at the inlet and outlet ends of the DTRO membrane module is fully compressed and installed in place, and the upper flange 14 is filled into the outer shell 17 of the cylinder, thereby making the storage and transportation operation simpler and more efficient.

[0088] At this time, the conical surface of the radially outer protrusion 16-2 is larger at the top and smaller at the bottom, so it can be inserted into and locked into the annular protrusion 18, making it difficult for the upper flange 14 to move spontaneously inside the cylindrical shell 17.

[0089] When the DTRO membrane module is in use, the upper flange 14 can be pushed outward from the center hole of the lower flange 13 at the inlet and outlet ends, thereby releasing the clamping relationship between the radially outer protrusion 16-2 and the annular protrusion 18. Then, the guide plate and DTRO membrane pack 12 are installed one by one, alternately, and finally the upper flange 14 is installed.

[0090] The structure of the DTRO membrane module also includes two external threaded rings 20 screwed onto the inner ring surface of the outer shell 17 and used for axially clamping the lower flange 13 and upper flange 14 at the inlet and outlet ends, respectively; and radially inward protrusions 21 and / or radially outward slots 22 disposed on the inner ring surface of the external threaded rings 20 and used for rotatably tightening the external threaded rings 20, wherein the radially outward slots 22 expose the inlet and outlet cavities on the lower flange 13 at the inlet and outlet ends.

[0091] In this embodiment, the radially inward protrusion 21 and the radially outward slot 22 both serve as force application points for the external threaded ring 20 to be rotated and tightened and rotated and removed, making the installation method of the external threaded ring 20 simpler and more efficient.

[0092] The radially outward slot 22 has the function of exposing the wastewater cavity 13-1 or the concentrate cavity 13-3, so that the water inlet / outlet function and the tightened state of the lower flange 13 at the inlet / outlet end do not affect each other.

[0093] Generally, the outer diameter, inner diameter and thickness of the two external threaded rings 20 are the same. One of them is provided with a radially inward protrusion 21 and the other is provided with a radially outward slot 22. The former is used on the top and the latter is used on the bottom.

[0094] The basic function of the external threaded ring 20 is to work together with the fastening nut 24 to more comprehensively tighten the lower flange 13 and the upper flange 14 at the water inlet and outlet ends.

[0095] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this application. These are non-inventive modifications and are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. A deflector, the structure of which comprises a stack of outer rings (1), a toroidal body (2) and a semi-spherical nose (3), characterized in that: Further comprising a combined radial positioning block unit (6) arranged on the two opposite sides of the stacked outer ring (1) respectively, and arranged on the circular ring body (2) in a way of abutting the outer ring surface of the sealing ring (11), and in a way of guiding the wastewater to the gap between the circular ring body (2) and the sealing ring (11), for improving the radial stability and the annular stability of the flow guide disc.

2. A flow inducer according to claim 1, wherein: The combined radial positioning block unit (6) comprises a radial protruding block (601) arranged on the inner ring surface of the circular ring body (2) and used for abutting the outer ring surface of the sealing ring (11), and a blocking flow guide strip (602) arranged on the circular ring body (2) and located radially inside the semispherical convex point (3), and located above the fixed convex block (4) and the engagement groove (5) respectively, and used for reducing the impact strength of the wastewater on the sealing ring (11) in a way of guiding the wastewater between the two adjacent radial protruding blocks (601).

3. A DTRO membrane assembly comprising the flow distributor as claimed in any one of claims 1-2, the structure comprising a sealing ring (11), a DTRO membrane pack (12), an inlet-outlet end lower flange (13), an upper flange (14), and a cylindrical housing (17), characterized in that: Further comprising a bidirectional pad block unit (15) arranged on the upper surface of the water inlet and outlet end lower flange (13) and used for vertically supporting the DTRO membrane package (12) and the radial engagement sealing ring (11) and the circular ring body (2), for improving the stability of the flow guide disc column.

4. A DTRO membrane module comprising the flow distributor according to claim 3, characterized in that: The bidirectional pad block unit (15) comprises a circular ring pad (15-1) arranged on the upper surface of the water inlet and outlet end lower flange (13) and used for supporting the lowermost sealing ring (11), for filling the height difference between the lower surface of the lowermost sealing ring (11) and the upper surface of the water inlet and outlet end lower flange (13).

5. A DTRO membrane module comprising the flow distributor according to claim 4, characterized in that: The bidirectional pad block unit (15) further comprises a fan-shaped vertical block (15-2) arranged on the upper surface of the circular ring pad (15-1) and annularly staggered with the combined radial positioning block unit (6), and used for simultaneously engaging the inner ring surface of the circular ring body (2) and the outer ring surface of the sealing ring (11).

6. A DTRO membrane module comprising the flow distributor according to claim 3, characterized in that: The combined convex block unit (16) comprises a circular ring convex block (16-1) arranged on the lower surface of the upper flange (14) and used for pressing down the sealing ring (11), and a plurality of radial outer convex blocks (16-2) arranged on the lower surface of the upper flange (14) and used for pressing down the stacked outer ring (1) and annularly spaced for passing wastewater.

7. A DTRO membrane module comprising the flow distributor according to claim 6, characterized in that: Further comprising a circular ring protruding plate (18) arranged on the inner ring surface of the cylinder shell (17), and a cylinder sealing ring (19) arranged on the lower surface of the circular ring protruding plate (18) and clamped by the water inlet and outlet end lower flange (13).

8. A DTRO membrane module comprising the flow distributor according to claim 7, characterized in that: The radial dimension between the inner ring surface of the circular convex plate (18) and the outer ring surface of the stacked outer ring (1) is 20.0-25.0mm, and the lower surface of the circular convex plate (18) blocks wastewater to improve the degree of circumferential uniform distribution of wastewater when it leaves the wastewater cavity (13-1).

9. A DTRO membrane module comprising the flow distributor according to claim 7, characterized in that: The radial outer side surface of the radial outer side bump (16-2) is a conical surface, and before the installation of the flow guide disc and the DTRO membrane pack (12), the upper flange (14) is clamped on the inner ring surface of the circular convex plate (18) through the outer ring surface of the radial outer side bump (16-2), so as to be axially fixed in the barrel shell (17).

10. A DTRO membrane module comprising the flow distributor according to claim 3, characterized in that: It also includes two outer threaded rings (20) arranged on the inner ring surface of the barrel shell (17) and used for axially clamping the lower flange (13) and the upper flange (14) of the water inlet and outlet end respectively, and a radial inward bump (21) and / or a radial outward slot (22) arranged on the inner ring surface of the outer threaded ring (20) and used for rotating and tightening the outer threaded ring (20), the radial outward slot (22) exposing the water inlet and outlet cavity on the lower flange (13) of the water inlet and outlet end.

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