CN210752127U - Reverse osmosis membrane element and water purification system - Google Patents

Abstract

The utility model relates to a reverse osmosis membrane element and water purification system, reverse osmosis membrane element includes reverse osmosis membrane piece group and dense water pipe, and reverse osmosis membrane piece group system of rolling up is equipped with the first water hole of crossing on the dense water pipe, and reverse osmosis membrane piece group's raw water runner and dense water pipe are last first to cross the water hole intercommunication, and reverse osmosis membrane piece group's raw water inlet is located reverse osmosis membrane element's terminal surface, and is located reverse osmosis membrane piece group and is close to the position of lateral surface, and the width of raw water runner is narrower, and cross sectional area is less to the velocity of flow increases, effectively alleviates concentration polarization. The pure water outlet of the reverse osmosis membrane is positioned on the outer side surface of the reverse osmosis membrane element. The flow velocity of the concentrated water in the raw water channel is higher at the position close to the concentrated water pipe, namely the shearing flow velocity of the concentrated water end in the raw water channel is higher, so that the concentration polarization phenomenon of the concentrated water end is effectively weakened, the pollution speed of the reverse osmosis membrane element is reduced, the reliability of the reverse osmosis membrane element is guaranteed while the water production efficiency is improved, and the service life is prolonged.

Description

Reverse osmosis membrane element and water purification system

Technical Field

The utility model relates to a water purification field especially relates to a reverse osmosis membrane element and water purification system.

Background

The reverse osmosis membrane element is mainly formed by rolling a water inlet separation net, a reverse osmosis membrane and pure water diversion cloth on a central water production pipe. Raw water enters the raw water flow passage from the raw water inlet of the reverse osmosis membrane element, and permeates in the process of flowing in the raw water flow passage to form pure water in the pure water flow passage on the reverse side of the reverse osmosis membrane. Finally, pure water flows out from the pure water outlet for users to use, and concentrated water flows out from the concentrated water outlet. However, the concentration polarization phenomenon of the common reverse osmosis membrane element on the concentrated water side is obvious, the service life of the reverse osmosis membrane element is short, and the water production efficiency is low.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a reverse osmosis membrane element and a water purification system to prolong the service life and improve the water production efficiency.

The utility model provides a reverse osmosis membrane element, includes reverse osmosis membrane piece group and dense water pipe, reverse osmosis membrane piece group system is in on the dense water pipe, be equipped with the first water hole of crossing on the dense water pipe, reverse osmosis membrane piece group's raw water runner with the first water hole intercommunication of crossing on the dense water pipe, reverse osmosis membrane piece group's raw water inlet is located reverse osmosis membrane element's terminal surface, just raw water inlet is located the position that is close to the lateral surface on the reverse osmosis membrane piece group, reverse osmosis membrane piece group's pure water delivery port is located reverse osmosis membrane element's lateral surface.

The reverse osmosis membrane element comprises a reverse osmosis membrane group which is rolled on the concentrated water pipe, raw water enters a raw water channel of the reverse osmosis membrane group from a raw water inlet and then gradually flows towards a direction close to the concentrated water pipe along the long edge of the raw water channel, water molecules gradually permeate into a pure water channel of the reverse osmosis membrane group to form pure water in the flowing process, and then the pure water spirally flows along the pure water channel and flows out from a pure water outlet on the outer side surface; and the formed concentrated water flows spirally in the raw water flow channel, is converged in the concentrated water pipe and flows out of the concentrated water pipe. Based on the raw water inlet sets up reverse osmosis membrane element's terminal surface, and be located the position that is close to the lateral surface, and dense water is followed concentrated water pipe gathering is discharged, the raw water is in filtering process walking route does reverse osmosis membrane group's long limit for filterable runner length is longer, and system water efficiency is higher. And further, based on reverse osmosis membrane group is rolled up and is made on the concentrate pipe, consequently for traditional reverse osmosis element, in this application concentrate in reverse osmosis element's the raw water runner is being close to the position velocity of flow of concentrate pipe is higher, promptly the concentrate of concentrate end has higher tangential velocity of flow in the raw water runner to effectively weaken concentrate end concentration polarization phenomenon, reduced reverse osmosis membrane element pollution speed, and then ensured reverse osmosis membrane element's reliability when improving system water efficiency, and prolonged life. And the pure water outlet is arranged on the outer side surface of the reverse osmosis membrane element while the raw water inlet is arranged close to the outer side surface, so that the pure water formed by filtering the raw water entering from the raw water inlet can flow out from the pure water outlet relatively quickly, and the pure water formed at the position gradually close to the concentrated water pipe flows out from the pure water outlet in the pure water flow passage along with the flowing of the raw water in the raw water flow passage. And roll up based on reverse osmosis membrane diaphragm group and make on the concentrate pipe, consequently the pure water that forms in the position that is close to the concentrate pipe will be in the pure water runner is the spiral is derived, the pure water velocity of flow of the position that is close to the concentrate pipe in the pure water runner is higher to effectively alleviate the big problem of pure water side backpressure near concentrate pipe, further improve system water efficiency.

In one embodiment, the reverse osmosis membrane group comprises a reverse osmosis membrane, a water inlet separation net and a pure water guide cloth which are all rolled on the concentrated water pipe, the front surface of the reverse osmosis membrane is folded, the water inlet separation net is clamped between the front surfaces of the reverse osmosis membrane to form the raw water flow passage, the pure water guide cloth is positioned on the back surface of the reverse osmosis membrane to form the pure water flow passage, and the raw water inlet is positioned on the long edge of the water inlet separation net and is far away from one end of the concentrated water pipe.

In one embodiment, the radial thickness of the reverse osmosis membrane group is R, the end face of the reverse osmosis membrane group is divided into a sealing part and an outer edge part in the radial direction, the outer edge part is positioned on the outer ring of the sealing part, the radial thickness of the sealing part is R, R/R is less than 1, and the raw water inlet is positioned on the outer edge part.

In one embodiment, the length of the long side of the raw water flow passage in the circumferential direction is L, the length of the raw water inlet in the circumferential direction is h, and h/L is less than or equal to 1/2.

In one embodiment, the reverse osmosis membrane groups are two or more, the reverse osmosis membrane groups are stacked and rolled on the concentrated water pipe, and a pure water flow channel is formed between the adjacent reverse osmosis membrane groups.

In one embodiment, the first water through holes are multiple, and the multiple first water through holes are arranged at intervals in the circumferential direction of the concentrated water pipe.

In one embodiment, the outer wall of the concentrated water pipe is provided with a diversion groove, and the diversion groove is communicated with the first water through hole.

In one embodiment, the part of the outer surface of the concentrated water pipe, which is surrounded by the reverse osmosis membrane group, is divided into an auxiliary connecting position and a water guiding position, the auxiliary connecting position is arranged along the axial direction of the concentrated water pipe, the auxiliary connecting position is the initial position of the reverse osmosis membrane group rolled on the concentrated water pipe, and the water guiding groove is arranged at the water guiding level.

In one embodiment, the flow guide grooves comprise criss-cross strip-shaped grooves.

In one embodiment, one end of the concentrated water pipe is closed, and the other end of the concentrated water pipe is communicated.

The utility model provides a water purification system, includes water intake pipe, pure water pipeline, waste water pipeline and reverse osmosis filter, reverse osmosis filter includes foretell reverse osmosis membrane element, reverse osmosis filter's water inlet with reverse osmosis membrane element's raw water inlet intercommunication, reverse osmosis filter's pure water mouth with reverse osmosis membrane element's pure water delivery port intercommunication, reverse osmosis filter's waste water mouth with the dense water delivery port intercommunication of dense water pipe, the inlet tube with the water inlet intercommunication, the pure water pipe with the pure water mouth intercommunication, the waste water pipe with the waste water mouth intercommunication.

Above-mentioned scheme provides a water purification system, through set up in the water purification system and include the reverse osmosis filter of any one of the above-mentioned embodiment reverse osmosis membrane element, thereby make water purification system has alleviated the concentrate end concentration polarization phenomenon when improving system water efficiency, and then has ensured the reliability of water purification system use and has prolonged life.

In one embodiment, a pretreatment unit, a water inlet electromagnetic valve and a pressure pump are sequentially arranged on the water inlet pipeline along the water flow direction, a waste water valve and a first scale inhibiting filter element are arranged on the waste water pipeline, the first scale inhibiting filter element is located at the upstream of the waste water valve, and/or a second scale inhibiting filter element is arranged on the water inlet pipeline.

In one embodiment, the water purification system further comprises a return pipeline, one end of the return pipeline is communicated with the wastewater pipeline, the other end of the return pipeline is communicated with the water inlet pipeline, and the position on the water inlet pipeline, which is communicated with the return pipeline, is located on one side, away from the water inlet, of the pressure pump.

In one embodiment, a waste water ratio electromagnetic valve and/or a one-way valve is/are arranged on the return pipeline.

Drawings

FIG. 1 is a schematic structural view of a reverse osmosis membrane element according to the present embodiment;

FIG. 2 is a front view of the reverse osmosis membrane element shown in FIG. 1;

FIG. 3 is a schematic structural view of the reverse osmosis membrane element of FIG. 1 in an expanded state;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a schematic view of the water flow in a reverse osmosis membrane module shown in FIG. 1 in an expanded state;

FIG. 6 is a left side view of a reverse osmosis membrane stack of the reverse osmosis membrane element shown in FIG. 1;

FIG. 7 is a schematic structural view of the end cap of the present embodiment;

FIG. 8 is an assembly view of the end cap, filter element reinforcement, reverse osmosis membrane stack and concentrate tube in combination;

FIG. 9 is a schematic diagram of the water purification system of the present embodiment;

fig. 10 is a system diagram of a water purification system in another embodiment.

Description of reference numerals:

10. a reverse osmosis membrane element; 11. a reverse osmosis membrane set; 111. a raw water flow passage; 1111. a raw water inlet; 112. a pure water flow passage; 1121. a pure water outlet; 113. a reverse osmosis membrane; 114. a water inlet separation net; 115. pure water diversion cloth; 116. an outer side surface; 117. a sealing part; 118. an outer edge portion; 12. a concentrated water pipe; 121. a first water through hole; 13. an end cap; 131. sealing the connection part; 132. an outer ring portion; 133. protruding surrounding ribs; 134. a raw water port; 14. a filter element reinforcement; 20. a water purification system; 21. a water inlet pipeline; 211. a pre-processing unit; 212. a water inlet electromagnetic valve; 213. a pressure pump; 22. a pure water line; 23. a waste water line; 231. a waste water valve; 24. a reverse osmosis filter; 25. a return line; 251. a wastewater ratio electromagnetic valve; 252. a one-way valve.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

As shown in fig. 1 to 3, in one embodiment, a reverse osmosis membrane element 10 is provided, which comprises a reverse osmosis membrane group 11 and a concentrated water pipe 12, wherein the reverse osmosis membrane group 11 is rolled on the concentrated water pipe 12. The concentrated water pipe 12 is provided with a first water through hole 121, and the raw water channel 111 of the reverse osmosis membrane group 11 is communicated with the first water through hole 121 on the concentrated water pipe 12. The concentrated water generated in the raw water flow passage 111 is collected into the concentrated water pipe 12 through the first water passing hole 121 and then discharged from the concentrated water pipe 12.

The raw water inlet 1111 of the reverse osmosis membrane group 11 is located on the end surface of the reverse osmosis membrane element 10, and the raw water inlet 1111 is located on the position of the reverse osmosis membrane group 11 close to the outer side surface 116. Therefore, in the process of producing water, raw water enters the raw water channel 111 of the reverse osmosis membrane stack 11 from the raw water inlet 1111 and then flows along the long side of the raw water channel 111 in a direction approaching the concentrated water pipe 12. Pure water outlet 1121 of reverse osmosis membrane element 11 is located on outer side surface 116 of reverse osmosis membrane element 10. In the flowing process of raw water, water molecules gradually permeate into the pure water flow channel 112 of the reverse osmosis membrane group 11 to form pure water, and then the pure water flows spirally along the pure water flow channel 112 and flows out of the pure water outlet 1121 at the outer side surface 116; the formed concentrated water flows spirally in the raw water flow passage 111, is gathered in the concentrated water pipe 12, and flows out from the concentrated water pipe 12.

The outer side surface 116 of the reverse osmosis membrane element 10 herein refers to an outer peripheral surface formed by the reverse osmosis membrane module 11 after the reverse osmosis membrane module 11 is rolled on the concentrate pipe 12. The raw water inlet 1111 is located on the reverse osmosis membrane stack 11 at a position close to the outer side surface 116, and means that the raw water inlet 1111 is located at a position closer to the outer side surface 116 than the raw water inlet 1111 is located on the inner circumferential surface of the reverse osmosis membrane stack 11 rolled and attached to the concentrate pipe 12. So that the raw water entering from the raw water inlet 1111 during the process of water production can gradually and spirally advance inwards along the long side of the raw water flow passage 112, and the finally formed concentrated water flows into the concentrated water pipe 12.

Preferably, as shown in fig. 5, the raw water inlet 1111 is located at the outermost end of the raw water channel 112, that is, the raw water inlet 1111 is formed at the outermost ring of the end surface of the reverse osmosis membrane stack 11.

The short side is a side distributed along the axial direction of the concentrate pipe 12, and the long side is a side spirally wound on the concentrate pipe 12 along the circumferential direction, that is, the long side is a side distributed along the advancing direction of the water flow during water production. Generally speaking, after the reverse osmosis membrane 113, the pure water guide cloth 115 and the water inlet separation net 114 included in the reverse osmosis membrane group 11 are rolled on the concentrated water pipe 12 for a plurality of turns, the long side is larger than the short side, so that the water production efficiency of the raw water advancing along the long side for filtering is higher.

As shown in fig. 5, the raw water inlet 1111 is disposed at the end surface of the reverse osmosis membrane element 10 and located near the outer side surface 116, while the concentrated water is collected and discharged from the concentrated water pipe 12, the travel path of the raw water during the filtration process is the long side of the reverse osmosis membrane stack 11, the length of the flow passage for filtration is long, and the water production efficiency is high. And based on the fact that the traveling path of the raw water in the filtering process is the long side of the reverse osmosis membrane group 11, the width of the cross section of the raw water channel 111 is the short side. Therefore, the scheme that the water flows forwards along the short side relatively and the width of the cross section of the raw water flow channel is the long side is adopted, so that the width of the raw water flow channel 111 is narrow, the area of the cross section is small, the flow speed is increased, and the concentration polarization phenomenon is effectively relieved.

Furthermore, as shown in fig. 1 to 3, based on that the reverse osmosis membrane group 11 is rolled on the concentrated water pipe 12, compared with a scheme that raw water is not gradually spiraled inwards along the raw water channel, in the present application, the flow velocity of the concentrated water in the raw water channel 111 near the concentrated water pipe 12 is higher, that is, the concentrated water at the concentrated water end in the raw water channel 111 has a certain tangential flow velocity, so that the concentration polarization phenomenon at the concentrated water end is effectively weakened, the contamination speed of the reverse osmosis membrane element 10 is reduced, and the reliability of the reverse osmosis membrane element 10 is ensured and the service life of the reverse osmosis membrane element 10 is prolonged while the water production efficiency is improved.

Further, by providing the raw water inlet 1111 at a position close to the outer side surface 116 and providing the pure water outlet 1121 at the outer side surface 116 of the reverse osmosis membrane element 10, as shown in fig. 1, pure water filtered in the vicinity of the raw water inlet 1111 can flow out from the pure water outlet 1121 relatively quickly, and pure water formed at a position gradually close to the concentrated water pipe 12 flows in the pure water flow passage 112 and flows out to the pure water outlet 1121 as the raw water flows in the raw water flow passage 111. On the basis of the reverse osmosis membrane set 11, the reverse osmosis membrane set is rolled on the concentrated water pipe 12, so that the pure water formed at the position close to the concentrated water pipe 12 is spirally guided out in the pure water flow passage 112, and the pure water flow speed at the position close to the concentrated water pipe 12 in the pure water flow passage 112 is higher, so that the problem of large back pressure of the pure water side in the concentrated water pipe 12 area is effectively solved, and the water production efficiency is further improved.

Specifically, in one embodiment, as shown in fig. 3 and 4, the reverse osmosis membrane set 11 includes a reverse osmosis membrane 113, a water inlet separation net 114 and a pure water diversion cloth 115, all of which are rolled on the concentrated water pipe 12. The front of the reverse osmosis membrane 113 is folded in half, and the water inlet separation net 114 is sandwiched between the front of the reverse osmosis membrane 113 to form the raw water flow passage 111. The pure water guide cloth 115 is positioned on the reverse side of the reverse osmosis membrane 113 to form a pure water flow passage 112. As shown in fig. 5, the raw water inlet 1111 is located on the long side of the water inlet screen 114 and is far away from one end of the concentrated water pipe 12. Thus, as shown in fig. 1 and 2, after the reverse osmosis membrane 113, the water inlet screen 114 and the pure water guide cloth 115 are rolled on the concentrated water pipe 12, the raw water inlet 1111 is located at the outermost layer of the rolled reverse osmosis membrane stack 11.

Raw water enters the raw water flow channel 111 from the raw water inlet 1111 located at the outermost layer, and spirally advances, so that finally formed concentrated water flows out from the concentrated water pipe 12, and formed pure water flows out from the pure water outlet 1121 at the outer side surface 116.

The front surface of the reverse osmosis membrane 113 herein refers to a surface through which water molecules can permeate in a high pressure environment, that is, a surface of the reverse osmosis membrane 113 on which the raw water flow channel 111 is formed. Correspondingly, the other side of the reverse osmosis membrane 113 is the reverse side.

Further, the pure water guide cloth 115 is connected to the reverse side of the reverse osmosis membrane 113 at a position close to both the short side and the two long sides of the concentrated water pipe 12, so as to realize three-side sealing, thereby forming the pure water flow passage 112. After the reverse osmosis membrane 113, the water inlet separation net 114 and the pure water guide cloth 115 are rolled on the concentrated water pipe 12. The positions except the raw water inlet 1111 are connected and sealed on the end surface of the reverse osmosis membrane group 11, so that the raw water channel 111 and the pure water channel 112 are isolated.

Specifically, as shown in fig. 6, the end surface of the reverse osmosis membrane stack 11 may be divided into a sealing portion 117 and an outer edge portion 118, the sealing portion 117 is a portion for performing the above-mentioned connection and sealing, and the outer edge portion 118 is located at an outer ring of the sealing portion 117. The raw water inlet 1111 is located in the outer edge portion 118.

As shown in fig. 7 and 8, an end cover 13 may be covered on an end face of the reverse osmosis membrane stack 11, a bottom wall of the end cover 13 may be divided into a sealing connection portion 131 and an outer ring portion 132, the sealing connection portion 131 corresponds to the sealing portion 117 of the reverse osmosis membrane stack 11, and the outer ring portion 132 corresponds to the outer edge portion 118. Therefore, glue can be applied between the sealing connection part 131 and the sealing part 117, so that the sealing part 117 of the reverse osmosis membrane group 11 is sealed, and the separation of the raw water channel 111 and the pure water channel 112 is realized. And the outer ring portion 132 may be provided with a raw water inlet 134 corresponding to the raw water inlet 1111.

As shown in fig. 8, an annular raised surrounding rib 133 may be further provided inside the bottom wall of the end cover 13, the raw water port 134 is distributed on the outer ring of the raised surrounding rib 133, and the raised surrounding rib 133 can be in contact with and sealed with the end surface of the reverse osmosis membrane stack 11. Or, the raised surrounding rib 133 surrounds the raw water port 134, and the raised surrounding rib 133 can be abutted and sealed on the end surface of the reverse osmosis membrane group 11.

Therefore, the raw water inlet 134 and the raw water inlet 1111 are reliably isolated from the sealing part 117 by the raised surrounding rib 133, and the situation that the end surface of the reverse osmosis membrane group 11 is torn and the raw water channel 111 is communicated with the pure water channel 112 due to the fact that raw water enters the sealing part 117 is avoided.

More specifically, in one embodiment, as shown in fig. 6, the radial thickness of the reverse osmosis membrane stack 11 is R, the radial thickness of the sealing portion 117 is R, and R/R < 1. So that the raw water inlet 1111 is located at a position close to the outer side surface 116 of the reverse osmosis membrane stack 11.

More preferably, R/R is not less than 2/3, that is, the outer edge 118 where the raw water inlet 1111 is formed is located at a position closer to the outer ring on the end surface of the reverse osmosis membrane stack 11.

Further, in one embodiment, as shown in fig. 5 and 6, the length of the long side of the raw water channel 111 in the circumferential direction is L, the length of the raw water inlet 1111 in the circumferential direction is h, and h/L is not more than 1/2. The size of the raw water inlet 1111 is thus limited.

Furthermore, h/L is more than or equal to 1/15, and the size of the raw water inlet is further limited. If the length of the raw water inlet 1111 is too large, the length of the raw water channel 111 is reduced, and the high-pressure environment of the raw water port 134 threatens the connection reliability between the pure water guide cloth 115 corresponding to the raw water port 134 and the reverse osmosis membrane 113, so that the size of the raw water inlet 1111 needs to be reasonably arranged, the requirement of water production efficiency is met, and the reliability of the filter element is also guaranteed.

When the end cover 13 is disposed on the end face of the reverse osmosis membrane stack 11, the size of the end cover 13 is also set corresponding to the radial thickness of the reverse osmosis membrane stack 11 and the radial thickness of the sealing portion 117.

The radial thickness of the sealing connection part 131 on the bottom wall of the end cover 13 is consistent with that of the sealing part 117, and the integrated radial thickness of the outer ring part 132 and the sealing connection part 131 on the bottom wall of the end cover 13 is consistent with that of the reverse osmosis membrane group 11.

Further, in an embodiment, as shown in fig. 3 and 4, two or more reverse osmosis membrane groups 11 are provided, each reverse osmosis membrane group 11 is stacked and rolled on the concentrated water pipe 12, and a pure water flow channel 112 is formed between adjacent reverse osmosis membrane groups 11.

Specifically, the number of the reverse osmosis membrane groups 11 can be set according to actual needs, but is limited by the water conductivity of the concentrated water pipe 12, and the number of the reverse osmosis membrane groups 11 needs to ensure that the generated concentrated water can be effectively discharged.

In addition, when the number of the reverse osmosis membrane groups 11 is large, the number of the raw water inlets 1111 located at the outer edge portion 118 is large, and R/R is greater than or equal to 2/3 and less than or equal to 1, and h/L is greater than or equal to 1/15 and less than or equal to 1/2 in order to ensure that the raw water inlets 1111 can be effectively communicated with the external raw water.

Further, in order to improve the reliability of the communication between the concentrated water pipe 12 and each raw water flow passage 111, in one embodiment, the first water through holes 121 are provided in plurality, and the first water through holes 121 are spaced in the circumferential direction of the concentrated water pipe 12. Therefore, each raw water channel 111 coiled on the concentrated water pipe 12 can correspond to a part of the first water through holes 121, and the concentrated water is discharged.

Further, in one embodiment, the outer wall of the concentrated water pipe 12 is provided with a guide groove, and the guide groove is communicated with the first water through hole 121. So that the concentrated water formed in the raw water flow passage 111 can flow to the first water passing holes 121 by the guide grooves.

Specifically, in one embodiment, the portion of the outer surface of the concentrate pipe 12 surrounded by the reverse osmosis membrane stack is divided into an auxiliary connection location and a lead water location. The auxiliary connection position is arranged along the axial direction of the concentrated water pipe 12, and the initial position of the reverse osmosis membrane group 11 rolled on the concentrated water pipe 12 is the auxiliary connection position. The guide grooves are arranged at the water guide level, so that the guide of the concentrated water in each raw water flow passage 111 is realized, and the concentrated water is convenient to converge into the concentrated water pipe 12.

Further, the guiding gutter is for setting up the criss-cross bar groove of water guide level to make each raw water runner 111 all can with the guiding gutter intercommunication, thereby dense water can pass through the guiding gutter flows to first water hole, finally is in assemble in the dense water pipe 12.

Further, in one embodiment, as shown in fig. 8, one end of the concentrate pipe 12 is closed and the other end is conducted. In order to simplify the pipeline design in the water inlet system 20, one end of the concentrated water pipe 12 is closed, and the other end is conducted, so that the concentrated water flows out from one end of the concentrated water pipe 12 only.

Further, as shown in fig. 8, in one embodiment, the reverse osmosis membrane element 10 further includes a filter element reinforcement 14, the filter element reinforcement 14 is provided with a central through hole, the reverse osmosis membrane group 11 is inserted into the central through hole, and a side wall of the central through hole abuts against and fits against an outer side surface 116 of the reverse osmosis membrane group 11.

Based on the position of the raw water inlet 1111 near the outer side surface 116 and the position of the pure water outlet 1121 at the outer side surface 116, in the water preparation process, the pressure difference between the raw water and the pure water will make the reverse osmosis membrane group 11 have a tendency to expand outward, and if expansion occurs, the reverse osmosis membrane group 11 will be deformed and damaged. And the filter element reinforcing piece 14 is arranged to limit the reverse osmosis membrane group 11 in the central through hole, so that the outward expansion force caused by pressure difference is overcome, and the reliable operation of the filtering process is ensured.

Specifically, the filter element reinforcement member 14 may be a plastic member, a metal member or a flexible member, as long as it can apply an inward force to the reverse osmosis membrane stack 11.

And the filter core reinforcing part 14 can be made of materials with filtering function, thereby playing the function of preventing explosion and cracking and further purifying water quality.

A through hole may be provided in the filter element reinforcement 14 so that pure water discharged from the pure water outlet 1121 can pass through the filter element reinforcement 14. Specifically, in one embodiment, the filter core reinforcing member 14 is provided with a second water through hole, and the second water through hole penetrates through a side wall of the filter core reinforcing member 14.

Further, as shown in fig. 9, in another embodiment, a water purification system 20 is provided, comprising a water inlet line 21, a plain water line 22, a waste water line 23 and a reverse osmosis filter 24. The reverse osmosis filter 24 comprises the reverse osmosis membrane element 10, a water inlet of the reverse osmosis filter 24 is communicated with a raw water inlet 1111 of the reverse osmosis membrane element 10, a pure water outlet of the reverse osmosis filter 24 is communicated with a pure water outlet 1121 of the reverse osmosis membrane element 10, and a waste water outlet of the reverse osmosis filter 24 is communicated with a concentrated water outlet of the concentrated water pipe 12. The water inlet pipe is communicated with the water inlet, the pure water pipe is communicated with the pure water port, and the waste water pipe is communicated with the waste water port.

The reverse osmosis filter 24 comprising the reverse osmosis membrane element 10 in any one of the above embodiments is arranged in the water purification system 20, so that the water purification system 20 improves the water production efficiency and simultaneously relieves the concentration polarization phenomenon at the concentrated water end, thereby ensuring the use reliability of the water purification system 20 and prolonging the service life.

Further, when the end cap 13 is included in the reverse osmosis membrane element 10, the water inlet communicates with the raw water inlet 134 on the end cap 13, so that the communication with the raw water inlet 1111 is realized.

Further, as shown in fig. 9, in an embodiment, a pretreatment unit 211, a water inlet solenoid valve 212 and a pressurizing pump 213 are sequentially disposed on the water inlet pipeline 21 along a water flow direction, a waste water valve 231 and a first scale inhibiting filter element are disposed on the waste water pipeline 23, and the first scale inhibiting filter element is located upstream of the waste water valve 231.

The pressurizing pump 213 provides pressure for the filtration process of the reverse osmosis filter 24, and the first scale inhibiting filter element is arranged on one side of the waste water valve 231 close to the waste water port, so that the service life of the waste water valve 231 can be further prolonged. The waste water valve 231 controls the switching of the water making and flushing states of the water purification system 20.

The pretreatment unit 211 pretreats the water entering the reverse osmosis filter 24 for filtration, and specifically, the pretreatment unit 211 may be a single pretreatment filter element or multiple pretreatment filter elements, or a single multi-stage composite filter element.

Similarly, a second scale inhibiting filter element may be disposed on the water inlet line 21 to filter the raw water entering the reverse osmosis filter 24.

The waste water valve 231 may be a waste water proportional valve, an electrodeless regulating valve, an electric valve, or the like.

Further, in one embodiment, as shown in fig. 10, the water purifying system 20 further includes a return line 25, one end of the return line 25 is connected to the waste water line 23, the other end of the return line 25 is connected to the water inlet line 21, and the position of the water inlet line 21 connected to the return line 25 is located on the side of the pressure pump 213 away from the water inlet.

Thereby, part of the wastewater in the wastewater pipeline 23 flows back to the water inlet pipeline 21, thereby improving the utilization rate of raw water.

Further, to improve the controllability of the water purification system 20, in one embodiment, as shown in fig. 10, a waste water ratio solenoid valve 251 and/or a check valve 252 are disposed on the return line 25.

Thereby regulating the amount of wastewater that flows back into the water inlet line 21, the check valve 252 ensures that only the wastewater in the wastewater line 23 can flow back into the water inlet line 21, and the raw water in the water inlet line 21 cannot flow directly into the wastewater line 23 through the return line 25.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (14)

1. The utility model provides a reverse osmosis membrane element, its characterized in that, includes reverse osmosis membrane piece group and dense water pipe, reverse osmosis membrane piece group system of rolling up is in on the dense water pipe, be equipped with the first water hole of crossing on the dense water pipe, reverse osmosis membrane piece group's raw water runner with the first water hole intercommunication of crossing on the dense water pipe, reverse osmosis membrane piece group's raw water inlet is located reverse osmosis membrane element's terminal surface, just raw water inlet is located the position that is close to the lateral surface on reverse osmosis membrane piece group, reverse osmosis membrane piece group's pure water delivery port is located reverse osmosis membrane element.

2. The reverse osmosis membrane element according to claim 1, wherein the reverse osmosis membrane group comprises a reverse osmosis membrane, a water inlet separation net and a pure water guide cloth, the reverse osmosis membrane is rolled on the concentrated water pipe, the front surface of the reverse osmosis membrane is folded, the water inlet separation net is clamped between the front surfaces of the reverse osmosis membrane to form the raw water flow passage, the pure water guide cloth is positioned on the reverse surface of the reverse osmosis membrane to form the pure water flow passage, and the raw water inlet is positioned on the long side of the water inlet separation net and is far away from one end of the concentrated water pipe.

3. The reverse osmosis membrane element according to claim 1, wherein the reverse osmosis membrane stack has a radial thickness R, the end surface of the reverse osmosis membrane stack is divided into a seal portion and an outer edge portion in the radial direction, the outer edge portion is located on the outer periphery of the seal portion, the seal portion has a radial thickness R, R/R < 1, and the raw water inlet is located on the outer edge portion.

4. The reverse osmosis membrane element of claim 3, wherein the raw water flow channel has a length L in the circumferential direction, the raw water inlet has a length h in the circumferential direction, and h/L is equal to or less than 1/2.

5. The reverse osmosis membrane element according to any one of claims 1 to 4, wherein the number of the reverse osmosis membrane groups is two or more, each reverse osmosis membrane group is stacked and rolled on the concentrate pipe, and a pure water flow passage is formed between adjacent reverse osmosis membrane groups.

6. The reverse osmosis membrane element of claim 5, wherein the first water passing holes are provided in plurality, and the plurality of first water passing holes are provided at intervals in the circumferential direction of the concentrate pipe.

7. The reverse osmosis membrane element of claim 5, wherein the outer wall of the concentrate pipe is provided with a guide groove, and the guide groove is communicated with the first water through hole.

8. The reverse osmosis membrane element according to claim 7, wherein a portion of the outer surface of the concentrate pipe surrounded by the reverse osmosis membrane stack is divided into an auxiliary connection site and a water guide site, the auxiliary connection site is arranged in the axial direction of the concentrate pipe, the auxiliary connection site is a starting position at which the reverse osmosis membrane stack is rolled on the concentrate pipe, and the guide groove is provided at the water guide site.

9. The reverse osmosis membrane element of claim 7, wherein the flow channels comprise criss-cross strip channels.

10. The reverse osmosis membrane element of any one of claims 1-4, wherein the concentrate line is closed at one end and open at the other end.

11. A water purification system comprising a water inlet line, a pure water line, a wastewater line, and a reverse osmosis filter, wherein the reverse osmosis filter comprises the reverse osmosis membrane element according to any one of claims 1 to 10, a water inlet of the reverse osmosis filter is communicated with a raw water inlet of the reverse osmosis membrane element, a pure water outlet of the reverse osmosis filter is communicated with a pure water outlet of the reverse osmosis membrane element, a wastewater outlet of the reverse osmosis filter is communicated with a concentrated water outlet of the concentrated water pipe, the water inlet pipe is communicated with the water inlet, the pure water pipe is communicated with the pure water outlet, and the wastewater pipe is communicated with the wastewater outlet.

12. The water purification system of claim 11, wherein a pretreatment unit, a water inlet solenoid valve and a pressure pump are sequentially arranged on the water inlet pipeline along a water flow direction, a waste water valve and a first scale inhibiting filter element are arranged on the waste water pipeline, the first scale inhibiting filter element is positioned at the upstream of the waste water valve, and/or a second scale inhibiting filter element is arranged on the water inlet pipeline.

13. The water purification system of claim 12, further comprising a return line, one end of the return line being in communication with the waste pipe and the other end of the return line being in communication with the water inlet line, the water inlet line being in communication with the return line on a side of the booster pump away from the water inlet.

14. The water purification system of claim 13, wherein the return line is provided with a waste water ratio solenoid valve and/or a one-way valve.

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