CN215996220U

CN215996220U - High-pressure-difference-resistant DTRO (draw texturing yarn) membrane module

Info

Publication number: CN215996220U
Application number: CN202122303020.4U
Authority: CN
Inventors: 刘意; 许超; 王宇丹
Original assignee: Hangzhou Bijie Environmental Protection Equipment Co ltd
Current assignee: Hangzhou Bijie Environmental Protection Equipment Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-03-11
Anticipated expiration: 2031-09-23

Abstract

The utility model discloses a DTRO membrane component with high pressure difference resistance, which comprises a membrane shell, wherein a main shaft is arranged in the membrane shell, a plurality of annular flow guide discs are sleeved on the main shaft, a membrane is arranged between any two adjacent flow guide discs, a chute is arranged on the side wall of the main shaft along the axial direction, and a slide block capable of sliding in the chute is arranged on the inner side wall of each flow guide disc; the lower end part and the upper end part of the main shaft are provided with a water passing flange and an upper pressure bearing flange which are used for fixing the flow guide disc; a permeate passage, a water inlet passage and a concentrated solution passage are also arranged in the membrane shell; the water passing flange is provided with a water inlet communicated with the water inlet channel, a permeate liquid outlet communicated with the permeate liquid channel and a concentrate liquid outlet communicated with the concentrate liquid channel; through the arrangement, the phenomenon that the rotation of the guide disc on the main shaft influences the filtering effect of the membrane on sewage and the stress of the lower pressure-bearing flange and the upper pressure-bearing flange is uneven under a high-pressure environment is avoided, and therefore the applicability of the high-pressure-difference-resistant DTRO membrane assembly is improved.

Description

High-pressure-difference-resistant DTRO (draw texturing yarn) membrane module

Technical Field

The utility model relates to a reverse osmosis equipment technical field, specifically speaking relates to a DTRO membrane module of resistant high pressure differential.

Background

The disc tube type reverse osmosis membrane has the advantages of stable effluent quality, strong pollution resistance, easy cleaning and the like, is widely applied to the field of high-concentration sewage treatment, and has the core technical characteristics of a DTRO membrane component; the existing reverse osmosis DTRO membrane assembly adopts pressure-bearing flanges and nuts at two ends of a main shaft to fix a flow guide disc and a membrane, and although the fixation between the flow guide disc and the membrane is solved, the existing reverse osmosis DTRO membrane assembly also has the defect that the flow guide disc rotates on the main shaft.

SUMMERY OF THE UTILITY MODEL

To the flow guide disc pivoted defect on the main shaft that exists among the prior art, the utility model provides a resistant high pressure differential's DTRO membrane module. The effect of fixed connection between guiding disc and the main shaft can be realized.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve:

a high pressure difference resistant DTRO membrane component comprises a vertically arranged membrane shell, a main shaft is arranged in the membrane shell, a plurality of annular flow guide discs which are arranged in an overlapped mode are sleeved on the main shaft, a membrane is arranged between any two adjacent flow guide discs, a plurality of sliding grooves with the same depth are axially arranged on the side wall of the main shaft, and sliding blocks capable of sliding in the sliding grooves are arranged on the inner side wall of each flow guide disc; the lower end part and the upper end part of the main shaft are provided with a water passing flange and an upper pressure bearing flange which are used for fixing the flow guide disc; a permeate passage between the flow guide discs and the main shaft, a water inlet passage between the flow guide discs and the membrane shell and a concentrated solution passage between two adjacent flow guide discs are also arranged in the membrane shell; the water passing flange is provided with a water inlet communicated with the water inlet channel, a permeate outlet communicated with the permeate channel and a concentrate outlet communicated with the concentrate channel.

Through the utility model discloses a setting of resistant high pressure differential's DTRO membrane module, sewage gets into inhalant canal from the water inlet, reentrant most guiding disk, the diaphragm is flowed through fast to the sewage of handling, then 180 reverse to another membrane face of diaphragm, get into next diaphragm through the concentrate passageway again, the permeate liquid stream after the diaphragm is handled leaves this resistant high pressure differential's DTRO membrane module from the permeate liquid delivery port through the liquid passageway, concentrate route concentrate passageway after the diaphragm is handled leaves this resistant high pressure differential's DTRO membrane module from the concentrate delivery port.

The flow guide disc and the membrane are arranged in a mutually overlapped mode, so that sewage can be filtered by the membrane to the maximum extent, and the purification efficiency of the high-pressure-difference-resistant DTRO membrane module on the sewage is improved.

The sliding groove and the sliding block are arranged in a limiting mode, the influence of the rotation of the guide disc on the main shaft on the filtering effect of the membrane on sewage and the uneven stress of the water passing flange and the upper pressure bearing flange in a high-pressure environment are avoided, and therefore the applicability of the high-pressure-difference-resistant DTRO membrane assembly is improved.

Preferably, the two end parts of the main shaft are provided with flange nuts for fixing the lower pressure-bearing flange and the upper pressure-bearing flange, and the main shaft is also provided with threads for screwing the flange nuts.

The utility model discloses in, through flange nut's setting, fix guiding plate and diaphragm on the main shaft for guiding plate and diaphragm are near together, have increased the stability of this resistant high pressure differential's DTRO membrane module.

Preferably, a drainage through hole for the concentrated solution to pass through is formed in the position, close to the axis, of the flow guide disc; the end surfaces of two sides of the flow guide disc are respectively provided with a first sealing ring positioned between the main shaft and the drainage through hole, the first sealing rings are abutted against adjacent membranes, and the permeation liquid channel is formed by the first sealing rings, the inner side walls of the membranes and the outer side wall of the main shaft; the edges of the end surfaces of the two sides of each flow guide disc are provided with convex rings, the convex rings on two adjacent flow guide discs are abutted against each other, and the water inlet channel is formed by the outer side wall of each convex ring and the inner wall of the membrane shell; the concentrate passageway comprises first sealing washer, bulge loop and drainage through-hole.

The utility model discloses in, through the setting of drainage through-hole for sewage after the capsule filtration gets into another terminal surface of guiding disk from the drainage through-hole and filters by the capsule once more, has realized sewage repeated filterable technical requirement, thereby has increased sewage purification's efficiency.

Through the setting of first sealing washer, with permeate liquid passageway and concentrate passageway mutual isolation for permeate liquid after handling via the diaphragm gets into permeate liquid passageway from the diaphragm, thereby has avoided the circulation between permeate liquid and the concentrate.

Through the setting of bulge loop, with the concentrate passageway in inhalant canal mutual isolation, untreated sewage gets into the concentrate passageway from the guiding disk of the top by the membrane multiple-layer filtration, the maximize the realization sewage treatment's efficiency.

Preferably, the main shaft comprises a middle shaft section, a lower shaft section and an upper shaft section, the diameter of the middle shaft section is equal to that of the lower shaft section, the diameter of the upper shaft section is smaller than that of the middle shaft section, an annular step is formed at the joint of the upper shaft section and the middle shaft section, the sliding groove extends to the annular step from the joint of the lower shaft section and the middle shaft section, the inner side wall of the water passing flange is abutted against the main shaft, an inner cavity communicated with the permeate liquid channel is formed between the inner side wall of the upper end part of the water passing flange and the main shaft in an outward expansion mode, and a permeate liquid through hole for connecting the permeate liquid outlet and the permeate liquid channel is formed in the inner side wall of the expansion part of the water passing flange; the inner side wall of the expansion part of the water passing flange is provided with a clamping block which is clamped and fixed with the lower end part of the sliding groove.

The utility model discloses in, through the setting of crossing water flange and main shaft diameter for diaphragm and guiding disc embolia the main shaft from the main shaft upper end on, cross the mutual joint of terminal surface under fixture block and the main shaft spout in the water flange internal diameter, avoided crossing the water flange and continued the downstream, thereby alleviateed flange nut's bearing capacity.

Preferably, the inner end surface of the water passing flange abuts against the adjacent convex ring, a first annular bulge arranged along the circumferential direction of the main shaft is arranged on the inner end surface of the water passing flange close to the main shaft, and the first annular bulge abuts against the adjacent first sealing ring; an annular pore for communicating the water inlet channel and the concentrated solution channel is formed between the end surface of the upper pressure-bearing flange and the adjacent convex ring, a second annular bulge arranged along the circumferential direction of the main shaft is arranged on the inner end surface of the upper pressure-bearing flange close to the main shaft, and the second annular bulge abuts against the first sealing ring adjacent to the second annular bulge.

The utility model discloses in, through the setting of first annular arch and the annular arch of second, avoid untreated sewage to get into during the permeate liquid passageway, through the setting of cyclic annular hole for inhalant canal's sewage can get into by multilayer diaphragm filtration treatment in the concentrate passageway, thereby has increased the filtration efficiency of this resistant high pressure differential's DTRO membrane module.

Preferably, a lower pressure-bearing flange is arranged between the flange nut and the water passing flange, and a flange through hole for the water inlet, the permeate water outlet and the concentrated solution water outlet to pass through is formed in the lower pressure-bearing flange; the edge of the lower end part of the water passing flange is inwards sunken to form a water passing flange groove, and the upper end part of the lower pressure bearing flange is upwards protruded to be clamped with the water passing flange groove.

The utility model discloses in, through crossing the block setting between water flange and the lower pressure-bearing flange for it is even to cross the atress between water flange and the lower pressure-bearing flange, thereby has increased this high pressure difference resistant DTRO membrane module's stability.

Preferably, lip-shaped sealing rings are arranged between the outer side walls of the lower pressure-bearing flange and the upper pressure-bearing flange and the membrane shell, and lip-shaped sealing ring mounting grooves are arranged on the outer side walls of the lower pressure-bearing flange and the upper pressure-bearing flange; and second sealing ring mounting grooves are formed in the inner side walls of the lower pressure-bearing flange and the upper pressure-bearing flange.

In the utility model, the arrangement of the lip-shaped sealing ring avoids the sewage from overflowing from the gaps between the lower bearing flange and the membrane shell and between the upper bearing flange and the membrane shell; through the arrangement of the second sealing ring, the permeation liquid is prevented from overflowing from gaps between the lower pressure-bearing flange and the main shaft and between the upper pressure-bearing flange and the main shaft, so that the sealing performance of the high-pressure-difference-resistant DTRO membrane assembly is improved.

Preferably, pressure-bearing nuts are arranged between the flange nut and the lower pressure-bearing flange and between the flange nut and the upper pressure-bearing flange, the positions, close to the axis, of the lower pressure-bearing flange and the upper pressure-bearing flange are inwards sunken to form pressure-bearing nut grooves for clamping the pressure-bearing nuts, and one end face of each pressure-bearing nut extends out of the pressure-bearing nut groove and expands towards the periphery.

The utility model discloses in, through the setting of pressure-bearing nut, realized down pressure-bearing flange, guiding disc, diaphragm and last pressure-bearing flange between stable fixed.

Preferably, the upper end surface and the lower end surface of the flow guide disc are both provided with hemispherical bulges.

The utility model discloses in, through the bellied setting of hemisphere, increased the torrent speed of sewage on the guiding disk to the filtration efficiency of diaphragm has been increased.

Drawings

FIG. 1 is a schematic diagram of a high differential pressure tolerant DTRO membrane module of example 1.

FIG. 2 is a cross-sectional view of a high differential pressure tolerant DTRO membrane module of example 1.

Fig. 3 is a schematic view of the spindle in embodiment 1.

FIG. 4 is a schematic view of a water passing flange in example 1.

Fig. 5 is a schematic view of a diaphragm in embodiment 1.

The names of the parts indicated by the numerical references in the drawings are as follows:

110. a membrane shell; 120. a main shaft; 130. a water inlet; 140. a permeate outlet; 150. a concentrated solution outlet; 161. a flange nut; 162. a pressure-bearing nut; 211. a water passing flange; 212. a lower pressure-bearing flange; 213. a first annular projection; 220. a flow guide disc; 230. a membrane; 240. a second annular projection; 250. an upper pressure-bearing flange; 261. a lip-shaped seal ring; 262. a second seal ring; 263. a lip-shaped seal ring mounting groove; 264. a second seal ring mounting groove; 270. an annular void; 280. a flange through hole; 310. a chute; 320. a thread; 321. a lower shaft section; 322. a middle shaft section; 323. an upper shaft section; 421. a clamping block; 422. an inner cavity; 423. a permeate through hole; 510. a hemispherical protrusion; 520. a drainage through hole; 530. a first seal ring; 541. a slider; 550. a convex ring.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention only and are not limiting.

Example 1

As shown in fig. 1-5, the present embodiment provides a high pressure difference resistant DTRO membrane module, which includes a vertically arranged membrane shell 110, a main shaft 120 is disposed in the membrane shell 110, a plurality of overlapped annular flow guide discs 220 are sleeved on the main shaft 120, a membrane 230 is disposed between any two adjacent flow guide discs 220, a plurality of chutes 310 with the same depth are axially disposed on a side wall of the main shaft 120, and sliders 541 capable of sliding in the chutes 310 are disposed on an inner side wall of the flow guide disc 220; the lower end part and the upper end part of the main shaft 120 are provided with a water passing flange 211 and an upper pressure bearing flange 250 which are used for fixing the deflector 220; a drainage through hole 520 for the concentrated solution to pass through is formed in the position, close to the axis, of the flow guide disc 220; the end surfaces of the two sides of the diversion disc 220 are respectively provided with a first sealing ring 530 positioned between the main shaft 120 and the drainage through hole 520, the first sealing ring 530 is abutted against the adjacent membrane 230, and a permeate passage is formed among the first sealing ring 530, the membrane 230 and the main shaft 120; the edges on the end surfaces of the two sides of the flow guide disc 220 are provided with convex rings 550, the convex rings 550 on two adjacent flow guide discs 220 are abutted against each other, and a water inlet channel is formed between each convex ring 550 and the inner wall of the membrane shell 110; the first sealing ring 530, the convex ring 550 and the drainage through hole 520 form a concentrated solution channel; the inner end surface of the water passing flange 211 abuts against the adjacent convex ring 550, a first annular protrusion 213 which is arranged along the circumferential direction of the main shaft 120 is arranged on the inner end surface of the water passing flange 211, which is close to the main shaft 120, and the first annular protrusion 213 abuts against the adjacent first sealing ring 530; an annular pore 270 for communicating the water inlet channel and the concentrated solution channel is formed between the end surface of the upper pressure-bearing flange 250 and the adjacent convex ring 550, a second annular protrusion 240 arranged along the circumferential direction of the main shaft 120 is arranged on the inner end surface of the upper pressure-bearing flange 250 close to the main shaft 120, and the second annular protrusion 240 abuts against the first sealing ring 530 adjacent to the second annular protrusion; the water passing flange 211 is provided with a water inlet 130 communicated with the water inlet channel, a permeate outlet 140 communicated with the permeate channel and a concentrate outlet 150 communicated with the concentrate channel; the main shaft 120 comprises a middle shaft section 322, a lower shaft section 321 and an upper shaft section 323, the diameter of the middle shaft section 322 is equal to that of the lower shaft section 321, the diameter of the upper shaft section 323 is smaller than that of the middle shaft section 322, an annular step is formed at the joint of the upper shaft section 323 and the middle shaft section 322, the sliding groove 310 extends to the annular step from the joint of the lower shaft section 321 and the middle shaft section 322, the inner side wall of the water passing flange 211 is abutted against the main shaft 120, an inner cavity 422 communicated with a permeate liquid channel is formed between the outer side wall of the upper end part of the water passing flange 211 and the main shaft 120 in an outward expansion mode, a permeate liquid through hole 423 for connecting the permeate liquid outlet 140 and the inner cavity 422 is formed in the inner side wall of the expansion part of the water passing flange 211, and a fixture block 421 clamped and fixed with the lower end part of the sliding groove 310 is arranged on the inner side wall of the expansion part of the water passing flange.

When the high pressure difference resistant DTRO membrane module of this embodiment is used specifically, sewage enters the high pressure difference resistant DTRO membrane module from the water inlet 130, enters the lower end surface of the uppermost diversion plate 220 through the water inlet channel, enters the upper end surface of the diversion plate 220 through the drainage through hole 520 in the diversion plate 220, contacts the membrane 230, enters the permeate liquid channel through the membrane 230 after being filtered by the membrane 230, and then flows out from the permeate liquid outlet 140 through the permeate liquid channel inner cavity 422; the sewage which does not enter the permeate passage enters the lower end face of the adjacent flow guide disc 220, the sewage is filtered by the overlapped multiple layers of membranes 230 to form a concentrated solution, and the concentrated solution flows out from the concentrated solution outlet 150; through the above arrangement, sewage can be filtered by the membrane 230 to the maximum extent, and the separation arrangement of the permeate liquid channel and the concentrated liquid channel ensures that the permeate liquid after being filtered is completely separated from the concentrated liquid, thereby greatly improving the filtering efficiency of sewage, and the permeate liquid formed after being filtered has low impurity content and stable water outlet.

Through the clamping arrangement of the fixture block 421 and the sliding groove 310 in this embodiment, when the water passing flange 211 slides from the upper end of the main shaft 120 to the bottom end of the sliding groove 310, the water passing flange does not continuously slide downwards, so that the bearing pressure and the stability of the high pressure difference resistant DTRO membrane assembly are improved.

Through the mutual matching relationship between the guide disc 220 and the sliding block 541 and the upper chute 310 of the main shaft 120 in the embodiment, the guide disc does not rotate on the main shaft 120 any more, so that the influence of the rotation of the guide disc on the main shaft on the filtering effect of the membrane on sewage and the uneven stress of the water passing flange and the upper pressure bearing flange in a high-pressure environment are avoided, and the applicability of the high-pressure-difference-resistant DTRO membrane module is improved.

In this embodiment, the upper end surface and the lower end surface of the diversion disc 220 are both provided with hemispherical protrusions 510.

Through the protruding 510's of hemisphere setting in this embodiment, can improve the filter effect of sewage.

In this embodiment, the two end portions of the main shaft 120 are provided with flange nuts 161 for fixing the lower pressure-bearing flange 212 and the upper pressure-bearing flange 250, and the main shaft 120 is further provided with threads 320 for screwing the flange nuts 161; a lower pressure-bearing flange 212 is arranged between the flange nut 161 and the water passing flange 211, and a flange through hole 280 for the water inlet 130, the permeate water outlet 140 and the concentrate water outlet 150 to pass through is arranged on the lower pressure-bearing flange 212; the edge of the lower end part of the water passing flange 211 is inwards sunken to form a water passing flange groove, and the upper end part of the lower pressure-bearing flange 212 is upwards protruded to be mutually clamped with the water passing flange groove; pressure-bearing nuts 162 are arranged between the flange nut 161 and the lower pressure-bearing flange 212 and the upper pressure-bearing flange 250, the positions, close to the axis, of the lower pressure-bearing flange 212 and the upper pressure-bearing flange 250 are inwards recessed to form pressure-bearing nut grooves for clamping the pressure-bearing nuts 162, and one end of each pressure-bearing nut 162 extends out of the pressure-bearing nut groove and expands towards the periphery.

When the high pressure difference resistant DTRO membrane assembly of the embodiment is used specifically, the flange nut 161, the bearing nut 162, the lower bearing flange 212, the water passing flange 211, the deflector 220, the membrane 230, the upper bearing flange 250, the bearing nut 162 and the flange nut 161 are sequentially sleeved from the lower end to the upper end along the axial direction of the main shaft 120 in a clamping manner, so that the bearing capacity of the high pressure difference resistant DTRO membrane assembly can be balanced to the maximum extent under high pressure, the flange nut 161 and the bearing nut 162 are fixed in a double-layer manner, and the stability of the high pressure difference resistant DTRO membrane assembly is improved.

In this embodiment, lip-shaped seal rings 261 are arranged between the outer side walls of the lower pressure-bearing flange 212 and the upper pressure-bearing flange 250 and the membrane shell 110, and lip-shaped seal ring installation grooves 263 are arranged on the outer side walls of the lower pressure-bearing flange 212 and the upper pressure-bearing flange 250; a second sealing ring 262 is arranged between the inner side walls of the lower pressure-bearing flange 212 and the upper pressure-bearing flange 250 and the main shaft 120, and a second sealing ring mounting groove 264 is arranged on the inner side walls of the lower pressure-bearing flange 212 and the upper pressure-bearing flange 250.

Through the arrangement of the lip-shaped sealing ring 261 and the second sealing ring 262 in the embodiment, the lip-shaped sealing ring 261 prevents sewage from overflowing from gaps between the lower pressure-bearing flange 212 and the upper pressure-bearing flange 250 and the membrane shell 110; the second sealing ring 262 prevents the permeation liquid from overflowing from the gaps between the lower and upper pressure-bearing

flanges

212 and 250 and the main shaft 120, thereby increasing the sealing performance of the high pressure difference resistant DTRO membrane module.

When the high pressure difference resistant DTRO membrane module of the embodiment is used specifically, sewage enters the water inlet channel from the water inlet 130, flows upwards along the water inlet channel under the action of high pressure, enters the lower end face of the uppermost diversion plate 220 through the annular hole 270, enters the upper end face of the diversion plate 220 from the drainage through hole 520 on the diversion plate 220 and flows from the origin of the diversion plate 220 to the periphery, the sewage contacts the membrane 230 in the process of flowing on the diversion plate 220, the permeate filtered by the membrane 230 enters the permeate channel through the membrane 230, enters the inner cavity 422 from the permeate channel, and finally flows out from the permeate outlet 140 communicated with the inner cavity 422; the sewage that does not enter the permeate passage enters the lower end face of the adjacent diversion disc 220 through the gap between the membrane 230 and the diversion disc 220 and flows from the periphery of the diversion disc 220 to the circle center, the sewage is filtered by the overlapped multiple layers of membranes 230 to form a concentrated solution, and finally the concentrated solution flows out from the concentrated solution outlet 150.

In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.

Claims

1. A DTRO membrane module of nai high pressure differential, characterized by: the membrane comprises a vertically arranged membrane shell (110), a main shaft (120) is arranged in the membrane shell (110), a plurality of annular flow guide discs (220) which are arranged in an overlapped mode are sleeved on the main shaft (120), a membrane (230) is arranged between any two adjacent flow guide discs (220), a plurality of sliding grooves (310) with the same depth are formed in the side wall of the main shaft (120) along the axial direction, and sliding blocks (541) capable of sliding in the sliding grooves (310) are arranged on the inner side wall of each flow guide disc (220); a water passing flange (211) and an upper pressure bearing flange (250) for fixing the flow guide disc (220) are arranged at the lower end part and the upper end part of the main shaft (120); a penetrating liquid channel between the flow guide discs (220) and the main shaft (120), a water inlet channel between the flow guide discs (220) and the membrane shell (110) and a concentrated liquid channel between two adjacent flow guide discs (220) are also arranged in the membrane shell (110); the water passing flange (211) is provided with a water inlet (130) communicated with the water inlet channel, a permeate outlet (140) communicated with the permeate channel and a concentrated solution outlet (150) communicated with the concentrated solution channel.

2. The high differential pressure resistant DTRO membrane module of claim 1, wherein: and flange nuts (161) for fixing the lower pressure-bearing flange (212) and the upper pressure-bearing flange (250) are arranged at two end parts of the main shaft (120), and threads (320) for screwing the flange nuts (161) are also arranged on the main shaft (120).

3. The high differential pressure resistant DTRO membrane module of claim 1, wherein: a drainage through hole (520) for concentrated solution to pass through is arranged at the position, close to the axis, of the flow guide disc (220); the end faces of two sides of the diversion disc (220) are respectively provided with a first sealing ring (530) positioned between the main shaft (120) and the drainage through hole (520), the first sealing ring (530) is abutted against the adjacent diaphragm (230), and the liquid permeation channel is formed by the first sealing ring (530), the inner side wall of the diaphragm (230) and the outer side wall of the main shaft (120); the edges of the end faces of the two sides of each flow guide disc (220) are provided with convex rings (550), the convex rings (550) on two adjacent flow guide discs (220) are mutually abutted, and the water inlet channel is formed by the outer side wall of each convex ring (550) and the inner wall of the membrane shell (110); the concentrate channel is composed of a first sealing ring (530), a convex ring (550) and a drainage through hole (520).

4. A high pressure differential tolerant DTRO membrane module according to claim 3, wherein: the main shaft (120) comprises a middle shaft section (322), a lower shaft section (321) and an upper shaft section (323), the diameter of the middle shaft section (322) is equal to that of the lower shaft section (321), the diameter of the upper shaft section (323) is smaller than that of the middle shaft section (322), an annular step is formed at the joint of the upper shaft section (323) and the middle shaft section (322), a sliding chute (310) extends to the annular step from the joint of the lower shaft section (321) and the middle shaft section (322), the inner side wall of the upper end part of the water passing flange (211) is abutted against the main shaft (120), an inner cavity (422) communicated with a permeate channel is formed between the outer side wall of the upper end part of the water passing flange (211) and the main shaft (120) in an outward expansion part, and permeate through holes (423) for connecting a permeate water outlet (140) and the permeate channel are formed in the inner side wall of the expansion part of the water passing flange (211); a fixture block (421) which is mutually clamped and fixed with the lower end part of the sliding groove (310) is arranged on the inner side wall of the expansion part of the water passing flange.

5. The high differential pressure resistant DTRO membrane module of claim 4, wherein: the inner end face of the water passing flange (211) abuts against the adjacent convex ring (550), a first annular protrusion (213) arranged along the circumferential direction of the main shaft (120) is arranged on the inner end face of the water passing flange (211) close to the main shaft (120), and the first annular protrusion (213) abuts against the adjacent first sealing ring (530); an annular pore (270) for communicating the water inlet channel with the concentrated solution channel is formed between the end face of the upper pressure-bearing flange (250) and the adjacent convex ring (550), a second annular protrusion (240) arranged along the circumferential direction of the main shaft (120) is arranged on the inner end face of the upper pressure-bearing flange (250) close to the main shaft (120), and the second annular protrusion (240) abuts against the first sealing ring (530) adjacent to the second annular protrusion.

6. The high differential pressure resistant DTRO membrane module of claim 5, wherein: a lower pressure-bearing flange (212) is arranged between the flange nut (161) and the water passing flange (211), and a flange through hole (280) for the water inlet (130), the permeate water outlet (140) and the concentrated liquid water outlet (150) to pass through is arranged on the lower pressure-bearing flange (212); the edge of the lower end part of the water passing flange (211) is inwards sunken to form a water passing flange groove, and the upper end part of the lower pressure bearing flange (212) is upwards protruded to be mutually clamped with the water passing flange groove.

7. The high differential pressure resistant DTRO membrane module of claim 6, wherein: lip-shaped sealing rings (261) are arranged between the outer side walls of the lower pressure-bearing flange (212) and the upper pressure-bearing flange (250) and the membrane shell (110), and lip-shaped sealing ring mounting grooves (263) are arranged on the outer side walls of the lower pressure-bearing flange (212) and the upper pressure-bearing flange (250); and a second sealing ring (262) is arranged between the inner side walls of the lower pressure-bearing flange (212) and the upper pressure-bearing flange (250) and the main shaft (120), and a second sealing ring mounting groove (264) is arranged on the inner side walls of the lower pressure-bearing flange (212) and the upper pressure-bearing flange (250).

8. The high differential pressure resistant DTRO membrane module of claim 7, wherein: pressure-bearing nuts (162) are arranged between the flange nut (161) and the lower pressure-bearing flange (212) and between the flange nut and the upper pressure-bearing flange (250), the positions, close to the axis, of the lower pressure-bearing flange (212) and the upper pressure-bearing flange (250) are inwards recessed to form pressure-bearing nut grooves for clamping the pressure-bearing nuts (162), and one end face of each pressure-bearing nut (162) extends out of each pressure-bearing nut groove and expands towards the periphery.

9. The high differential pressure resistant DTRO membrane module of claim 1, wherein: the upper end surface and the lower end surface of the flow guide disc (220) are both provided with hemispherical bulges (510).